aboutsummaryrefslogtreecommitdiffstats
path: root/epan/prefs.c
blob: 1be85e2fa1f6c4a790b38a1844c43547a4dfc080 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
/* prefs.c
 * Routines for handling preferences
 *
 * $Id$
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <glib.h>

#include <epan/filesystem.h>
#include <epan/address.h>
#include <epan/addr_resolv.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/proto.h>
#include <epan/column.h>
#include "print.h"

#include <epan/prefs-int.h>

/* Internal functions */
static module_t *find_module(const char *name);
static module_t *prefs_register_module_or_subtree(module_t *parent,
    const char *name, const char *title, gboolean is_subtree,
    void (*apply_cb)(void));
static struct preference *find_preference(module_t *, const char *);
static int    set_pref(gchar*, gchar*);
static GList *get_string_list(gchar *);
static gchar *put_string_list(GList *);
static void   clear_string_list(GList *);
static void   free_col_info(e_prefs *);

#define PF_NAME		"preferences"
#define OLD_GPF_NAME	"ethereal.conf"	/* old name for global preferences file */

static gboolean prefs_initialized = FALSE;
static gchar *gpf_path = NULL;

/*
 * XXX - variables to allow us to attempt to interpret the first
 * "mgcp.{tcp,udp}.port" in a preferences file as
 * "mgcp.{tcp,udp}.gateway_port" and the second as
 * "mgcp.{tcp,udp}.callagent_port".
 */
static int mgcp_tcp_port_count;
static int mgcp_udp_port_count;

e_prefs prefs;

static const gchar	*gui_ptree_line_style_text[] =
	{ "NONE", "SOLID", "DOTTED", "TABBED", NULL };

static const gchar	*gui_ptree_expander_style_text[] =
	{ "NONE", "SQUARE", "TRIANGLE", "CIRCULAR", NULL };

static const gchar	*gui_hex_dump_highlight_style_text[] =
	{ "BOLD", "INVERSE", NULL };

static const gchar	*gui_console_open_text[] =
	{ "NEVER", "AUTOMATIC", "ALWAYS", NULL };

static const gchar	*gui_fileopen_style_text[] =
	{ "LAST_OPENED", "SPECIFIED", NULL };

/* GTK knows of two ways representing "both", vertical and horizontal aligned.
 * as this may not work on other guis, we use only "both" in general here */
static const gchar	*gui_toolbar_style_text[] =
	{ "ICONS", "TEXT", "BOTH", NULL };

static const gchar	*gui_layout_content_text[] =
	{ "NONE", "PLIST", "PDETAILS", "PBYTES", NULL };

/*
 * List of all modules with preference settings.
 */
static GList *modules;

/*
 * List of all modules that should show up at the top level of the
 * tree in the preference dialog box.
 */
static GList *top_level_modules;

static gint
module_compare_name(gconstpointer p1_arg, gconstpointer p2_arg)
{
	const module_t *p1 = p1_arg;
	const module_t *p2 = p2_arg;

	return g_strcasecmp(p1->name, p2->name);
}

static gint
module_compare_title(gconstpointer p1_arg, gconstpointer p2_arg)
{
	const module_t *p1 = p1_arg;
	const module_t *p2 = p2_arg;

	return g_strcasecmp(p1->title, p2->title);
}

/*
 * Register a module that will have preferences.
 * Specify the module under which to register it or NULL to register it
 * at the top level, the name used for the module in the preferences file,
 * the title used in the tab for it in a preferences dialog box, and a
 * routine to call back when we apply the preferences.
 */
module_t *
prefs_register_module(module_t *parent, const char *name, const char *title,
    void (*apply_cb)(void))
{
	return prefs_register_module_or_subtree(parent, name, title, FALSE,
	    apply_cb);
}

/*
 * Register a subtree that will have modules under it.
 * Specify the module under which to register it or NULL to register it
 * at the top level and the title used in the tab for it in a preferences
 * dialog box.
 */
module_t *
prefs_register_subtree(module_t *parent, const char *title)
{
	return prefs_register_module_or_subtree(parent, NULL, title, TRUE,
	    NULL);
}

static module_t *
prefs_register_module_or_subtree(module_t *parent, const char *name,
    const char *title, gboolean is_subtree, void (*apply_cb)(void))
{
	module_t *module;
	const char *p;

	module = g_malloc(sizeof (module_t));
	module->name = name;
	module->title = title;
	module->is_subtree = is_subtree;
	module->apply_cb = apply_cb;
	module->prefs = NULL;	/* no preferences, to start */
	module->numprefs = 0;
	module->prefs_changed = FALSE;
	module->obsolete = FALSE;

	/*
	 * Do we have a module name?
	 */
	if (name != NULL) {
		/*
		 * Yes.
		 * Make sure that only lower-case ASCII letters, numbers,
		 * underscores, hyphens, and dots appear in the name.
		 *
		 * Crash if there is, as that's an error in the code;
		 * you can make the title a nice string with capitalization,
		 * white space, punctuation, etc., but the name can be used
		 * on the command line, and shouldn't require quoting,
		 * shifting, etc.
		 */
		for (p = name; *p != '\0'; p++)
			g_assert(isascii(*p) &&
			    (islower(*p) || isdigit(*p) || *p == '_' ||
			     *p == '-' || *p == '.'));

		/*
		 * Make sure there's not already a module with that
		 * name.  Crash if there is, as that's an error in the
		 * code, and the code has to be fixed not to register
		 * more than one module with the same name.
		 *
		 * We search the list of all modules; the subtree stuff
		 * doesn't require preferences in subtrees to have names
		 * that reflect the subtree they're in (that would require
		 * protocol preferences to have a bogus "protocol.", or
		 * something such as that, to be added to all their names).
		 */
		g_assert(find_module(name) == NULL);

		/*
		 * Insert this module in the list of all modules.
		 */
		modules = g_list_insert_sorted(modules, module,
		    module_compare_name);
	} else {
		/*
		 * This has no name, just a title; check to make sure it's a
		 * subtree, and crash if it's not.
		 */
		g_assert(is_subtree);
	}

	/*
	 * Insert this module into the appropriate place in the display
	 * tree.
	 */
	if (parent == NULL) {
		/*
		 * It goes at the top.
		 */
		top_level_modules = g_list_insert_sorted(top_level_modules,
		    module, module_compare_title);
	} else {
		/*
		 * It goes into the list for this module.
		 */
		parent->prefs = g_list_insert_sorted(parent->prefs, module,
		    module_compare_title);
	}

	return module;
}

/*
 * Register that a protocol has preferences.
 */
module_t *protocols_module;

module_t *
prefs_register_protocol(int id, void (*apply_cb)(void))
{
	protocol_t *protocol;

	/*
	 * Have we yet created the "Protocols" subtree?
	 */
	if (protocols_module == NULL) {
		/*
		 * No.  Do so.
		 */
		protocols_module = prefs_register_subtree(NULL, "Protocols");
	}
	protocol = find_protocol_by_id(id);
	return prefs_register_module(protocols_module,
	    proto_get_protocol_filter_name(id),
	    proto_get_protocol_short_name(protocol), apply_cb);
}

/*
 * Register that a protocol used to have preferences but no longer does,
 * by creating an "obsolete" module for it.
 */
module_t *
prefs_register_protocol_obsolete(int id)
{
	module_t *module;
	protocol_t *protocol;

	/*
	 * Have we yet created the "Protocols" subtree?
	 */
	if (protocols_module == NULL) {
		/*
		 * No.  Do so.
		 */
		protocols_module = prefs_register_subtree(NULL, "Protocols");
	}
	protocol = find_protocol_by_id(id);
	module = prefs_register_module(protocols_module,
	    proto_get_protocol_filter_name(id),
	    proto_get_protocol_short_name(protocol), NULL);
	module->obsolete = TRUE;
	return module;
}

/*
 * Find a module, given its name.
 */
static gint
module_match(gconstpointer a, gconstpointer b)
{
	const module_t *module = a;
	const char *name = b;

	return strcmp(name, module->name);
}

static module_t *
find_module(const char *name)
{
	GList *list_entry;

	list_entry = g_list_find_custom(modules, name, module_match);
	if (list_entry == NULL)
		return NULL;	/* no such module */
	return (module_t *) list_entry->data;
}

/*
 * Call a callback function, with a specified argument, for each module
 * in a list of modules.  If the list is NULL, searches the top-level
 * list in the display tree of modules.  If any callback returns a
 * non-zero value, we stop and return that value, otherwise we
 * return 0.
 *
 * Ignores "obsolete" modules; their sole purpose is to allow old
 * preferences for dissectors that no longer have preferences to be
 * silently ignored in preference files.  Does not ignore subtrees,
 * as this can be used when walking the display tree of modules.
 */
guint
prefs_module_list_foreach(GList *module_list, module_cb callback,
    gpointer user_data)
{
	GList *elem;
	module_t *module;
	guint ret;

	if (module_list == NULL)
		module_list = top_level_modules;

	for (elem = g_list_first(module_list); elem != NULL;
	    elem = g_list_next(elem)) {
		module = elem->data;
		if (!module->obsolete) {
			ret = (*callback)(module, user_data);
			if (ret != 0)
				return ret;
		}
	}
	return 0;
}

/*
 * Call a callback function, with a specified argument, for each module
 * in the list of all modules.  (This list does not include subtrees.)
 *
 * Ignores "obsolete" modules; their sole purpose is to allow old
 * preferences for dissectors that no longer have preferences to be
 * silently ignored in preference files.
 */
guint
prefs_modules_foreach(module_cb callback, gpointer user_data)
{
	return prefs_module_list_foreach(modules, callback, user_data);
}

static void
call_apply_cb(gpointer data, gpointer user_data _U_)
{
	module_t *module = data;

	if (module->obsolete)
		return;
	if (module->prefs_changed) {
		if (module->apply_cb != NULL)
			(*module->apply_cb)();
		module->prefs_changed = FALSE;
	}
}

/*
 * Call the "apply" callback function for each module if any of its
 * preferences have changed, and then clear the flag saying its
 * preferences have changed, as the module has been notified of that
 * fact.
 */
void
prefs_apply_all(void)
{
	g_list_foreach(modules, call_apply_cb, NULL);
}

/*
 * Register a preference in a module's list of preferences.
 * If it has a title, give it an ordinal number; otherwise, it's a
 * preference that won't show up in the UI, so it shouldn't get an
 * ordinal number (the ordinal should be the ordinal in the set of
 * *visible* preferences).
 */
static pref_t *
register_preference(module_t *module, const char *name, const char *title,
    const char *description, pref_type_t type)
{
	pref_t *preference;
	const gchar *p;

	preference = g_malloc(sizeof (pref_t));
	preference->name = name;
	preference->title = title;
	preference->description = description;
	preference->type = type;
	if (title != NULL)
		preference->ordinal = module->numprefs;
	else
		preference->ordinal = -1;	/* no ordinal for you */

	/*
	 * Make sure that only lower-case ASCII letters, numbers,
	 * underscores, and dots appear in the preference name.
	 *
	 * Crash if there is, as that's an error in the code;
	 * you can make the title and description nice strings
	 * with capitalization, white space, punctuation, etc.,
	 * but the name can be used on the command line,
	 * and shouldn't require quoting, shifting, etc.
	 */
	for (p = name; *p != '\0'; p++)
		g_assert(isascii((guchar)*p) &&
		    (islower((guchar)*p) || isdigit((guchar)*p) || *p == '_' || *p == '.'));

	/*
	 * Make sure there's not already a preference with that
	 * name.  Crash if there is, as that's an error in the
	 * code, and the code has to be fixed not to register
	 * more than one preference with the same name.
	 */
	g_assert(find_preference(module, name) == NULL);

	if (type != PREF_OBSOLETE) {
		/*
		 * Make sure the preference name doesn't begin with the
		 * module name, as that's redundant and Just Silly.
		 */
		g_assert((strncmp(name, module->name, strlen(module->name)) != 0) ||
			(((name[strlen(module->name)]) != '.') && ((name[strlen(module->name)]) != '_')));
	}

	/*
	 * There isn't already one with that name, so add the
	 * preference.
	 */
	module->prefs = g_list_append(module->prefs, preference);
	if (title != NULL)
		module->numprefs++;

	return preference;
}

/*
 * Find a preference in a module's list of preferences, given the module
 * and the preference's name.
 */
static gint
preference_match(gconstpointer a, gconstpointer b)
{
	const pref_t *pref = a;
	const char *name = b;

	return strcmp(name, pref->name);
}

static struct preference *
find_preference(module_t *module, const char *name)
{
	GList *list_entry;

	list_entry = g_list_find_custom(module->prefs, name,
	    preference_match);
	if (list_entry == NULL)
		return NULL;	/* no such preference */
	return (struct preference *) list_entry->data;
}

/*
 * Returns TRUE if the given protocol has registered preferences
 */
gboolean
prefs_is_registered_protocol(const char *name)
{
	module_t *m = find_module(name);

	return (m != NULL && !m->obsolete);
}

/*
 * Returns the module title of a registered protocol
 */
const char *
prefs_get_title_by_name(const char *name)
{
	module_t *m = find_module(name);

	return (m != NULL && !m->obsolete) ? m->title : NULL;
}

/*
 * Register a preference with an unsigned integral value.
 */
void
prefs_register_uint_preference(module_t *module, const char *name,
    const char *title, const char *description, guint base, guint *var)
{
	pref_t *preference;

	preference = register_preference(module, name, title, description,
	    PREF_UINT);
	preference->varp.uint = var;
	preference->info.base = base;
}

/*
 * Register a preference with an Boolean value.
 */
void
prefs_register_bool_preference(module_t *module, const char *name,
    const char *title, const char *description, gboolean *var)
{
	pref_t *preference;

	preference = register_preference(module, name, title, description,
	    PREF_BOOL);
	preference->varp.boolp = var;
}

/*
 * Register a preference with an enumerated value.
 */
void
prefs_register_enum_preference(module_t *module, const char *name,
    const char *title, const char *description, gint *var,
    const enum_val_t *enumvals, gboolean radio_buttons)
{
	pref_t *preference;

	preference = register_preference(module, name, title, description,
	    PREF_ENUM);
	preference->varp.enump = var;
	preference->info.enum_info.enumvals = enumvals;
	preference->info.enum_info.radio_buttons = radio_buttons;
}

/*
 * Register a preference with a character-string value.
 */
void
prefs_register_string_preference(module_t *module, const char *name,
    const char *title, const char *description, const char **var)
{
	pref_t *preference;

	preference = register_preference(module, name, title, description,
	    PREF_STRING);

	/*
	 * String preference values should be non-null (as you can't
	 * keep them null after using the preferences GUI, you can at best
	 * have them be null strings) and freeable (as we free them
	 * if we change them).
	 *
	 * If the value is a null pointer, make it a copy of a null
	 * string, otherwise make it a copy of the value.
	 */
	if (*var == NULL)
		*var = g_strdup("");
	else
		*var = g_strdup(*var);
	preference->varp.string = var;
	preference->saved_val.string = NULL;
}

/*
 * Register a preference with a ranged value.
 */
void
prefs_register_range_preference(module_t *module, const char *name,
    const char *title, const char *description, range_t **var,
    guint32 max_value)
{
	pref_t *preference;

	preference = register_preference(module, name, title, description,
					 PREF_RANGE);
	preference->info.max_value = max_value;


	/*
	 * Range preference values should be non-null (as you can't
	 * keep them null after using the preferences GUI, you can at best
	 * have them be empty ranges) and freeable (as we free them
	 * if we change them).
	 *
	 * If the value is a null pointer, make it an empty range.
	 */
	if (*var == NULL)
		*var = range_empty();
	preference->varp.range = var;
	preference->saved_val.range = NULL;
}

/*
 * Register a preference that used to be supported but no longer is.
 */
void
prefs_register_obsolete_preference(module_t *module, const char *name)
{
	register_preference(module, name, NULL, NULL, PREF_OBSOLETE);
}

/*
 * Call a callback function, with a specified argument, for each preference
 * in a given module.
 *
 * If any of the callbacks return a non-zero value, stop and return that
 * value, otherwise return 0.
 */
guint
prefs_pref_foreach(module_t *module, pref_cb callback, gpointer user_data)
{
	GList *elem;
	pref_t *pref;
	guint ret;

	for (elem = g_list_first(module->prefs); elem != NULL;
	    elem = g_list_next(elem)) {
		pref = elem->data;
		if (pref->type == PREF_OBSOLETE) {
			/*
			 * This preference is no longer supported; it's
			 * not a real preference, so we don't call the
			 * callback for it (i.e., we treat it as if it
			 * weren't found in the list of preferences,
			 * and we weren't called in the first place).
			 */
			continue;
		}

		ret = (*callback)(pref, user_data);
		if (ret != 0)
			return ret;
	}
	return 0;
}

/*
 * Register all non-dissector modules' preferences.
 */
void
prefs_register_modules(void)
{
}

/* Parse through a list of comma-separated, possibly quoted strings.
   Return a list of the string data. */
static GList *
get_string_list(gchar *str)
{
  enum { PRE_STRING, IN_QUOT, NOT_IN_QUOT };

  gint      state = PRE_STRING, i = 0, j = 0;
  gboolean  backslash = FALSE;
  guchar    cur_c;
  gchar    *slstr = NULL;
  GList    *sl = NULL;

  /* Allocate a buffer for the first string.   */
  slstr = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
  j = 0;

  for (;;) {
    cur_c = str[i];
    if (cur_c == '\0') {
      /* It's the end of the input, so it's the end of the string we
         were working on, and there's no more input. */
      if (state == IN_QUOT || backslash) {
        /* We were in the middle of a quoted string or backslash escape,
           and ran out of characters; that's an error.  */
        g_free(slstr);
        clear_string_list(sl);
        return NULL;
      }
      slstr[j] = '\0';
      sl = g_list_append(sl, slstr);
      break;
    }
    if (cur_c == '"' && ! backslash) {
      switch (state) {
        case PRE_STRING:
          /* We hadn't yet started processing a string; this starts the
             string, and we're now quoting.  */
          state = IN_QUOT;
          break;
        case IN_QUOT:
          /* We're in the middle of a quoted string, and we saw a quotation
             mark; we're no longer quoting.   */
          state = NOT_IN_QUOT;
          break;
        case NOT_IN_QUOT:
          /* We're working on a string, but haven't seen a quote; we're
             now quoting.  */
          state = IN_QUOT;
          break;
        default:
          break;
      }
    } else if (cur_c == '\\' && ! backslash) {
      /* We saw a backslash, and the previous character wasn't a
         backslash; escape the next character.

         This also means we've started a new string. */
      backslash = TRUE;
      if (state == PRE_STRING)
        state = NOT_IN_QUOT;
    } else if (cur_c == ',' && state != IN_QUOT && ! backslash) {
      /* We saw a comma, and we're not in the middle of a quoted string
         and it wasn't preceded by a backslash; it's the end of
         the string we were working on...  */
      slstr[j] = '\0';
      sl = g_list_append(sl, slstr);

      /* ...and the beginning of a new string.  */
      state = PRE_STRING;
      slstr = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
      j = 0;
    } else if (!isspace(cur_c) || state != PRE_STRING) {
      /* Either this isn't a white-space character, or we've started a
         string (i.e., already seen a non-white-space character for that
         string and put it into the string).

         The character is to be put into the string; do so if there's
         room.  */
      if (j < COL_MAX_LEN) {
        slstr[j] = cur_c;
        j++;
      }

      /* If it was backslash-escaped, we're done with the backslash escape.  */
      backslash = FALSE;
    }
    i++;
  }
  return(sl);
}

#define MAX_FMT_PREF_LEN      1024
#define MAX_FMT_PREF_LINE_LEN   60
static gchar *
put_string_list(GList *sl)
{
  static gchar  pref_str[MAX_FMT_PREF_LEN] = "";
  GList        *clp = g_list_first(sl);
  gchar        *str;
  int           cur_pos = 0, cur_len = 0;
  gchar        *quoted_str;
  int           str_len;
  gchar        *strp, *quoted_strp, c;
  int           fmt_len;

  while (clp) {
    str = clp->data;

    /* Allocate a buffer big enough to hold the entire string, with each
       character quoted (that's the worst case).  */
    str_len = strlen(str);
    quoted_str = g_malloc(str_len*2 + 1);

    /* Now quote any " or \ characters in it. */
    strp = str;
    quoted_strp = quoted_str;
    while ((c = *strp++) != '\0') {
      if (c == '"' || c == '\\') {
        /* It has to be backslash-quoted.  */
        *quoted_strp++ = '\\';
      }
      *quoted_strp++ = c;
    }
    *quoted_strp = '\0';

    fmt_len = strlen(quoted_str) + 4;
    if ((fmt_len + cur_len) < (MAX_FMT_PREF_LEN - 1)) {
      if ((fmt_len + cur_pos) > MAX_FMT_PREF_LINE_LEN) {
        /* Wrap the line.  */
        cur_len--;
        cur_pos = 0;
        pref_str[cur_len] = '\n'; cur_len++;
        pref_str[cur_len] = '\t'; cur_len++;
      }
      sprintf(&pref_str[cur_len], "\"%s\", ", quoted_str);
      cur_pos += fmt_len;
      cur_len += fmt_len;
    }
    g_free(quoted_str);
    clp = clp->next;
  }

  /* If the string is at least two characters long, the last two characters
     are ", ", and should be discarded, as there are no more items in the
     string.  */
  if (cur_len >= 2)
    pref_str[cur_len - 2] = '\0';

  return(pref_str);
}

static void
clear_string_list(GList *sl)
{
  GList *l = sl;

  while (l) {
    g_free(l->data);
    l = g_list_remove_link(l, l);
  }
}

/*
 * Takes a string, a pointer to an array of "enum_val_t"s, and a default gint
 * value.
 * The array must be terminated by an entry with a null "name" string.
 *
 * If the string matches a "name" string in an entry, the value from that
 * entry is returned.
 *
 * Otherwise, if a string matches a "desctiption" string in an entry, the
 * value from that entry is returned; we do that for backwards compatibility,
 * as we used to have only a "name" string that was used both for command-line
 * and configuration-file values and in the GUI (which meant either that
 * the GUI had what might be somewhat cryptic values to select from or that
 * the "-o" flag took long strings, often with spaces in them).
 *
 * Otherwise, the default value that was passed as the third argument is
 * returned.
 */
gint
find_val_for_string(const char *needle, const enum_val_t *haystack,
    gint default_value)
{
	int i;

	for (i = 0; haystack[i].name != NULL; i++) {
		if (strcasecmp(needle, haystack[i].name) == 0) {
			return haystack[i].value;
		}
	}
	for (i = 0; haystack[i].name != NULL; i++) {
		if (strcasecmp(needle, haystack[i].description) == 0) {
			return haystack[i].value;
		}
	}
	return default_value;
}

/* Takes an string and a pointer to an array of strings, and a default int value.
 * The array must be terminated by a NULL string. If the string is found in the array
 * of strings, the index of that string in the array is returned. Otherwise, the
 * default value that was passed as the third argument is returned.
 */
static int
find_index_from_string_array(char *needle, const char **haystack, int default_value)
{
	int i = 0;

	while (haystack[i] != NULL) {
		if (strcmp(needle, haystack[i]) == 0) {
			return i;
		}
		i++;
	}
	return default_value;
}

/* Preferences file format:
 * - Configuration directives start at the beginning of the line, and
 *   are terminated with a colon.
 * - Directives can be continued on the next line by preceding them with
 *   whitespace.
 *
 * Example:

# This is a comment line
print.command: lpr
print.file: /a/very/long/path/
	to/ethereal-out.ps
 *
 */

#define DEF_NUM_COLS    6

/* Initialize preferences to wired-in default values.
 * They may be overridden by the global preferences file or the
 *  user's preferences file.
 */
void
init_prefs() {
  int         i;
  fmt_data    *cfmt;
  const gchar *col_fmt[] = {"No.",      "%m", "Time",        "%t",
                           "Source",   "%s", "Destination", "%d",
                           "Protocol", "%p", "Info",        "%i"};

  if (prefs_initialized)
    return;

  prefs.pr_format  = PR_FMT_TEXT;
  prefs.pr_dest    = PR_DEST_CMD;
  prefs.pr_file    = g_strdup("ethereal.out");
  prefs.pr_cmd     = g_strdup("lpr");
  prefs.col_list = NULL;
  for (i = 0; i < DEF_NUM_COLS; i++) {
    cfmt = (fmt_data *) g_malloc(sizeof(fmt_data));
    cfmt->title = g_strdup(col_fmt[i * 2]);
    cfmt->fmt   = g_strdup(col_fmt[(i * 2) + 1]);
    prefs.col_list = g_list_append(prefs.col_list, cfmt);
  }
  prefs.num_cols  = DEF_NUM_COLS;
  prefs.st_client_fg.pixel =     0;
  prefs.st_client_fg.red   = 32767;
  prefs.st_client_fg.green =     0;
  prefs.st_client_fg.blue  =     0;
  prefs.st_client_bg.pixel =     0;
  prefs.st_client_bg.red   = 64507;
  prefs.st_client_bg.green = 60909;
  prefs.st_client_bg.blue  = 60909;
  prefs.st_server_fg.pixel =     0;
  prefs.st_server_fg.red   =     0;
  prefs.st_server_fg.green =     0;
  prefs.st_server_fg.blue  = 32767;
  prefs.st_server_bg.pixel =     0;
  prefs.st_server_bg.red   = 60909;
  prefs.st_server_bg.green = 60909;
  prefs.st_server_bg.blue  = 64507;
  prefs.gui_scrollbar_on_right = TRUE;
  prefs.gui_plist_sel_browse = FALSE;
  prefs.gui_ptree_sel_browse = FALSE;
  prefs.gui_altern_colors = FALSE;
  prefs.gui_ptree_line_style = 0;
  prefs.gui_ptree_expander_style = 1;
  prefs.gui_hex_dump_highlight_style = 1;
  prefs.filter_toolbar_show_in_statusbar = FALSE;
  prefs.gui_toolbar_main_style = TB_STYLE_ICONS;
#ifdef _WIN32
  /* XXX - not sure, if it must be "Lucida Console" or "lucida console"
   * for gui_font_name1. Maybe it's dependant on the windows version running?!
   * verified on XP: "Lucida Console"
   * unknown for other windows versions.
   *
   * Problem: if we have no preferences file, and the default font name is unknown, 
   * we cannot save Preferences as an error dialog pops up "You have not selected a font".
   */
  prefs.gui_font_name1 = g_strdup("-*-Lucida Console-medium-r-*-*-*-100-*-*-*-*-*-*");
  prefs.gui_font_name2 = g_strdup("Lucida Console 10");
#else
  /*
   * XXX - for now, we make the initial font name a pattern that matches
   * only ISO 8859/1 fonts, so that we don't match 2-byte fonts such
   * as ISO 10646 fonts.
   *
   * Users in locales using other one-byte fonts will have to choose
   * a different font from the preferences dialog - or put the font
   * selection in the global preferences file to make that font the
   * default for all users who don't explicitly specify a different
   * font.
   *
   * Making this a font set rather than a font has two problems:
   *
   *	1) as far as I know, you can't select font sets with the
   *	   font selection dialog;
   *
   *  2) if you use a font set, the text to be drawn must be a
   *	   multi-byte string in the appropriate locale, but
   *	   Ethereal does *NOT* guarantee that's the case - in
   *	   the hex-dump window, each character in the text portion
   *	   of the display must be a *single* byte, and in the
   *	   packet-list and protocol-tree windows, text extracted
   *	   from the packet is not necessarily in the right format.
   *
   * "Doing this right" may, for the packet-list and protocol-tree
   * windows, require that dissectors know what the locale is
   * *AND* know what locale and text representation is used in
   * the packets they're dissecting, and may be impossible in
   * the hex-dump window (except by punting and displaying only
   * ASCII characters).
   *
   * GTK+ 2.0 may simplify part of the problem, as it will, as I
   * understand it, use UTF-8-encoded Unicode as its internal
   * character set; however, we'd still have to know whatever
   * character set and encoding is used in the packet (which
   * may differ for different protocols, e.g. SMB might use
   * PC code pages for some strings and Unicode for others, whilst
   * NFS might use some UNIX character set encoding, e.g. ISO 8859/x,
   * or one of the EUC character sets for Asian languages, or one
   * of the other multi-byte character sets, or UTF-8, or...).
   *
   * I.e., as far as I can tell, "internationalizing" the packet-list,
   * protocol-tree, and hex-dump windows involves a lot more than, say,
   * just using font sets rather than fonts.
   */
  prefs.gui_font_name1 = g_strdup("-misc-fixed-medium-r-semicondensed-*-*-120-*-*-*-*-iso8859-1");
  /* XXX- is this the correct default font name for GTK2 none win32? */
  prefs.gui_font_name2 = g_strdup("fixed medium 12");
#endif
  prefs.gui_marked_fg.pixel        =     65535;
  prefs.gui_marked_fg.red          =     65535;
  prefs.gui_marked_fg.green        =     65535;
  prefs.gui_marked_fg.blue         =     65535;
  prefs.gui_marked_bg.pixel        =         0;
  prefs.gui_marked_bg.red          =         0;
  prefs.gui_marked_bg.green        =         0;
  prefs.gui_marked_bg.blue         =         0;
  prefs.gui_geometry_save_position =         0;
  prefs.gui_geometry_save_size     =         1;
  prefs.gui_geometry_save_maximized=         1;
  prefs.gui_console_open           = console_open_never;
  prefs.gui_fileopen_style         = FO_STYLE_LAST_OPENED;
  prefs.gui_recent_files_count_max = 10;
  prefs.gui_fileopen_dir           = g_strdup("");
  prefs.gui_fileopen_preview       = 3;
  prefs.gui_ask_unsaved            = TRUE;
  prefs.gui_find_wrap              = TRUE;
  prefs.gui_webbrowser             = g_strdup(HTML_VIEWER " %s");
  prefs.gui_window_title           = g_strdup("");
  prefs.gui_layout_type            = layout_type_5;
  prefs.gui_layout_content_1       = layout_pane_content_plist;
  prefs.gui_layout_content_2       = layout_pane_content_pdetails;
  prefs.gui_layout_content_3       = layout_pane_content_pbytes;

/* set the default values for the capture dialog box */
  prefs.capture_device           = NULL;
  prefs.capture_devices_descr    = NULL;
  prefs.capture_devices_hide     = NULL;
  prefs.capture_prom_mode        = TRUE;
  prefs.capture_real_time        = FALSE;
  prefs.capture_auto_scroll      = FALSE;
  prefs.capture_show_info        = TRUE;
  prefs.name_resolve             = RESOLV_ALL ^ RESOLV_NETWORK;
  prefs.name_resolve_concurrency = 500;

  prefs_initialized = TRUE;
}


/* Read the preferences file, fill in "prefs", and return a pointer to it.

   If we got an error (other than "it doesn't exist") trying to read
   the global preferences file, stuff the errno into "*gpf_errno_return"
   and a pointer to the path of the file into "*gpf_path_return", and
   return NULL.

   If we got an error (other than "it doesn't exist") trying to read
   the user's preferences file, stuff the errno into "*pf_errno_return"
   and a pointer to the path of the file into "*pf_path_return", and
   return NULL. */
e_prefs *
read_prefs(int *gpf_errno_return, int *gpf_read_errno_return,
	   char **gpf_path_return, int *pf_errno_return,
	   int *pf_read_errno_return, char **pf_path_return)
{
  int         err;
  char        *pf_path;
  FILE        *pf;

  init_prefs();

  /*
   * If we don't already have the pathname of the global preferences
   * file, construct it.  Then, in either case, try to open the file.
   */
  if (gpf_path == NULL) {
    /*
     * We don't have the path; try the new path first, and, if that
     * file doesn't exist, try the old path.
     */
    gpf_path = get_datafile_path(PF_NAME);
    if ((pf = fopen(gpf_path, "r")) == NULL && errno == ENOENT) {
      /*
       * It doesn't exist by the new name; try the old name.
       */
      g_free(gpf_path);
      gpf_path = get_datafile_path(OLD_GPF_NAME);
      pf = fopen(gpf_path, "r");
    }
  } else {
    /*
     * We have the path; try it.
     */
    pf = fopen(gpf_path, "r");
  }

  /*
   * If we were able to open the file, read it.
   * XXX - if it failed for a reason other than "it doesn't exist",
   * report the error.
   */
  *gpf_path_return = NULL;
  if (pf != NULL) {
    /*
     * Start out the counters of "mgcp.{tcp,udp}.port" entries we've
     * seen.
     */
    mgcp_tcp_port_count = 0;
    mgcp_udp_port_count = 0;

    /* We succeeded in opening it; read it. */
    err = read_prefs_file(gpf_path, pf, set_pref);
    if (err != 0) {
      /* We had an error reading the file; return the errno and the
         pathname, so our caller can report the error. */
      *gpf_errno_return = 0;
      *gpf_read_errno_return = err;
      *gpf_path_return = gpf_path;
    }
    fclose(pf);
  } else {
    /* We failed to open it.  If we failed for some reason other than
       "it doesn't exist", return the errno and the pathname, so our
       caller can report the error. */
    if (errno != ENOENT) {
      *gpf_errno_return = errno;
      *gpf_read_errno_return = 0;
      *gpf_path_return = gpf_path;
    }
  }

  /* Construct the pathname of the user's preferences file. */
  pf_path = get_persconffile_path(PF_NAME, FALSE);

  /* Read the user's preferences file, if it exists. */
  *pf_path_return = NULL;
  if ((pf = fopen(pf_path, "r")) != NULL) {
    /*
     * Start out the counters of "mgcp.{tcp,udp}.port" entries we've
     * seen.
     */
    mgcp_tcp_port_count = 0;
    mgcp_udp_port_count = 0;

    /* We succeeded in opening it; read it. */
    err = read_prefs_file(pf_path, pf, set_pref);
    if (err != 0) {
      /* We had an error reading the file; return the errno and the
         pathname, so our caller can report the error. */
      *pf_errno_return = 0;
      *pf_read_errno_return = err;
      *pf_path_return = pf_path;
    } else
      g_free(pf_path);
    fclose(pf);
  } else {
    /* We failed to open it.  If we failed for some reason other than
       "it doesn't exist", return the errno and the pathname, so our
       caller can report the error. */
    if (errno != ENOENT) {
      *pf_errno_return = errno;
      *pf_read_errno_return = 0;
      *pf_path_return = pf_path;
    } else
      g_free(pf_path);
  }

  return &prefs;
}

/* read the preferences file (or similiar) and call the callback 
 * function to set each key/value pair found */
int
read_prefs_file(const char *pf_path, FILE *pf, pref_set_pair_cb pref_set_pair_fct)
{
  enum { START, IN_VAR, PRE_VAL, IN_VAL, IN_SKIP };
  int       got_c, state = START;
  GString  *cur_val;
  GString  *cur_var;
  gboolean  got_val = FALSE;
  gint      fline = 1, pline = 1;
  gchar     hint[] = "(saving your preferences once should remove this warning)";

  cur_val = g_string_new("");
  cur_var = g_string_new("");

  while ((got_c = getc(pf)) != EOF) {
    if (got_c == '\n') {
      state = START;
      fline++;
      continue;
    }

    switch (state) {
      case START:
        if (isalnum(got_c)) {
          if (cur_var->len > 0) {
            if (got_val) {
              switch (pref_set_pair_fct(cur_var->str, cur_val->str)) {

	      case PREFS_SET_SYNTAX_ERR:
                g_warning ("%s line %d: Syntax error %s", pf_path, pline, hint);
                break;

	      case PREFS_SET_NO_SUCH_PREF:
                g_warning ("%s line %d: No such preference \"%s\" %s", pf_path,
				pline, cur_var->str, hint);
                break;

	      case PREFS_SET_OBSOLETE:
	        /* We silently ignore attempts to set these; it's
	           probably not the user's fault that it's in there -
	           they may have saved preferences with a release that
	           supported them. */
                break;
              }
            } else {
              g_warning ("%s line %d: Incomplete preference %s", pf_path, pline, hint);
            }
          }
          state      = IN_VAR;
          got_val    = FALSE;
          g_string_truncate(cur_var, 0);
          g_string_append_c(cur_var, (gchar) got_c);
          pline = fline;
        } else if (isspace(got_c) && cur_var->len > 0 && got_val) {
          state = PRE_VAL;
        } else if (got_c == '#') {
          state = IN_SKIP;
        } else {
          g_warning ("%s line %d: Malformed line %s", pf_path, fline, hint);
        }
        break;
      case IN_VAR:
        if (got_c != ':') {
          g_string_append_c(cur_var, (gchar) got_c);
        } else {
          state   = PRE_VAL;
          g_string_truncate(cur_val, 0);
          got_val = TRUE;
        }
        break;
      case PRE_VAL:
        if (!isspace(got_c)) {
          state = IN_VAL;
          g_string_append_c(cur_val, (gchar) got_c);
        }
        break;
      case IN_VAL:
        if (got_c != '#')  {
          g_string_append_c(cur_val, (gchar) got_c);
        } else {
          while (isspace((guchar)cur_val->str[cur_val->len]) && cur_val->len > 0)
            g_string_truncate(cur_val, cur_val->len - 1);
          state = IN_SKIP;
        }
        break;
    }
  }
  if (cur_var->len > 0) {
    if (got_val) {
      switch (pref_set_pair_fct(cur_var->str, cur_val->str)) {

      case PREFS_SET_SYNTAX_ERR:
        g_warning ("%s line %d: Syntax error %s", pf_path, pline, hint);
        break;

      case PREFS_SET_NO_SUCH_PREF:
        g_warning ("%s line %d: No such preference \"%s\" %s", pf_path,
			pline, cur_var->str, hint);
        break;

      case PREFS_SET_OBSOLETE:
	/* We silently ignore attempts to set these; it's probably not
	   the user's fault that it's in there - they may have saved
	   preferences with a release that supported it. */
        break;
      }
    } else {
      g_warning ("%s line %d: Incomplete preference %s", pf_path, pline, hint);
    }
  }

  g_string_free(cur_val, TRUE);
  g_string_free(cur_var, TRUE);

  if (ferror(pf))
    return errno;
  else
    return 0;
}

/*
 * Given a string of the form "<pref name>:<pref value>", as might appear
 * as an argument to a "-o" option, parse it and set the preference in
 * question.  Return an indication of whether it succeeded or failed
 * in some fashion.
 */
int
prefs_set_pref(char *prefarg)
{
	gchar *p, *colonp;
	int ret;

	/*
	 * Set the counters of "mgcp.{tcp,udp}.port" entries we've
	 * seen to values that keep us from trying to interpret tham
	 * as "mgcp.{tcp,udp}.gateway_port" or "mgcp.{tcp,udp}.callagent_port",
	 * as, from the command line, we have no way of guessing which
	 * the user had in mind.
	 */
	mgcp_tcp_port_count = -1;
	mgcp_udp_port_count = -1;

	colonp = strchr(prefarg, ':');
	if (colonp == NULL)
		return PREFS_SET_SYNTAX_ERR;

	p = colonp;
	*p++ = '\0';

	/*
	 * Skip over any white space (there probably won't be any, but
	 * as we allow it in the preferences file, we might as well
	 * allow it here).
	 */
	while (isspace((guchar)*p))
		p++;
	if (*p == '\0') {
		/*
		 * Put the colon back, so if our caller uses, in an
		 * error message, the string they passed us, the message
		 * looks correct.
		 */
		*colonp = ':';
		return PREFS_SET_SYNTAX_ERR;
	}

	ret = set_pref(prefarg, p);
	*colonp = ':';	/* put the colon back */
	return ret;
}

#define PRS_PRINT_FMT                    "print.format"
#define PRS_PRINT_DEST                   "print.destination"
#define PRS_PRINT_FILE                   "print.file"
#define PRS_PRINT_CMD                    "print.command"
#define PRS_COL_FMT                      "column.format"
#define PRS_STREAM_CL_FG                 "stream.client.fg"
#define PRS_STREAM_CL_BG                 "stream.client.bg"
#define PRS_STREAM_SR_FG                 "stream.server.fg"
#define PRS_STREAM_SR_BG                 "stream.server.bg"
#define PRS_GUI_SCROLLBAR_ON_RIGHT       "gui.scrollbar_on_right"
#define PRS_GUI_PLIST_SEL_BROWSE         "gui.packet_list_sel_browse"
#define PRS_GUI_PTREE_SEL_BROWSE         "gui.protocol_tree_sel_browse"
#define PRS_GUI_ALTERN_COLORS            "gui.tree_view_altern_colors"
#define PRS_GUI_FILTER_TOOLBAR_IN_STATUSBAR "gui.filter_toolbar_show_in_statusbar"
#define PRS_GUI_PTREE_LINE_STYLE         "gui.protocol_tree_line_style"
#define PRS_GUI_PTREE_EXPANDER_STYLE     "gui.protocol_tree_expander_style"
#define PRS_GUI_HEX_DUMP_HIGHLIGHT_STYLE "gui.hex_dump_highlight_style"
#define PRS_GUI_FONT_NAME_1              "gui.font_name"
#define PRS_GUI_FONT_NAME_2              "gui.gtk2.font_name"
#define PRS_GUI_MARKED_FG                "gui.marked_frame.fg"
#define PRS_GUI_MARKED_BG                "gui.marked_frame.bg"
#define PRS_GUI_CONSOLE_OPEN             "gui.console_open"
#define PRS_GUI_FILEOPEN_STYLE           "gui.fileopen.style"
#define PRS_GUI_RECENT_COUNT_MAX         "gui.recent_files_count.max"
#define PRS_GUI_FILEOPEN_DIR             "gui.fileopen.dir"
#define PRS_GUI_FILEOPEN_REMEMBERED_DIR  "gui.fileopen.remembered_dir"
#define PRS_GUI_FILEOPEN_PREVIEW         "gui.fileopen.preview"
#define PRS_GUI_ASK_UNSAVED              "gui.ask_unsaved"
#define PRS_GUI_FIND_WRAP                "gui.find_wrap"
#define PRS_GUI_GEOMETRY_SAVE_POSITION   "gui.geometry.save.position"
#define PRS_GUI_GEOMETRY_SAVE_SIZE       "gui.geometry.save.size"
#define PRS_GUI_GEOMETRY_SAVE_MAXIMIZED  "gui.geometry.save.maximized"
#define PRS_GUI_GEOMETRY_MAIN_X          "gui.geometry.main.x"
#define PRS_GUI_GEOMETRY_MAIN_Y          "gui.geometry.main.y"
#define PRS_GUI_GEOMETRY_MAIN_WIDTH      "gui.geometry.main.width"
#define PRS_GUI_GEOMETRY_MAIN_HEIGHT     "gui.geometry.main.height"
#define PRS_GUI_TOOLBAR_MAIN_SHOW        "gui.toolbar_main_show"
#define PRS_GUI_TOOLBAR_MAIN_STYLE       "gui.toolbar_main_style"
#define PRS_GUI_WEBBROWSER               "gui.webbrowser"
#define PRS_GUI_WINDOW_TITLE             "gui.window_title"
#define PRS_GUI_LAYOUT_TYPE              "gui.layout_type"
#define PRS_GUI_LAYOUT_CONTENT_1         "gui.layout_content_1"
#define PRS_GUI_LAYOUT_CONTENT_2         "gui.layout_content_2"
#define PRS_GUI_LAYOUT_CONTENT_3         "gui.layout_content_3"

/*
 * This applies to more than just captures, so it's not "capture.name_resolve";
 * "capture.name_resolve" is supported on input for backwards compatibility.
 *
 * It's not a preference for a particular part of Ethereal, it's used all
 * over the place, so its name doesn't have two components.
 */
#define PRS_NAME_RESOLVE "name_resolve"
#define PRS_NAME_RESOLVE_CONCURRENCY "name_resolve_concurrency"
#define PRS_CAP_NAME_RESOLVE "capture.name_resolve"

/*  values for the capture dialog box */
#define PRS_CAP_DEVICE        "capture.device"
#define PRS_CAP_DEVICES_DESCR "capture.devices_descr"
#define PRS_CAP_DEVICES_HIDE  "capture.devices_hide"
#define PRS_CAP_PROM_MODE     "capture.prom_mode"
#define PRS_CAP_REAL_TIME     "capture.real_time_update"
#define PRS_CAP_AUTO_SCROLL   "capture.auto_scroll"
#define PRS_CAP_SHOW_INFO     "capture.show_info"

#define RED_COMPONENT(x)   (guint16) (((((x) >> 16) & 0xff) * 65535 / 255))
#define GREEN_COMPONENT(x) (guint16) (((((x) >>  8) & 0xff) * 65535 / 255))
#define BLUE_COMPONENT(x)  (guint16) ( (((x)        & 0xff) * 65535 / 255))

static const gchar *pr_formats[] = { "text", "postscript" };
static const gchar *pr_dests[]   = { "command", "file" };

typedef struct {
  char    letter;
  guint32 value;
} name_resolve_opt_t;

static name_resolve_opt_t name_resolve_opt[] = {
  { 'm', RESOLV_MAC },
  { 'n', RESOLV_NETWORK },
  { 't', RESOLV_TRANSPORT },
  { 'C', RESOLV_CONCURRENT },
};

#define N_NAME_RESOLVE_OPT	(sizeof name_resolve_opt / sizeof name_resolve_opt[0])

static const char *
name_resolve_to_string(guint32 name_resolve)
{
  static char string[N_NAME_RESOLVE_OPT+1];
  char *p;
  unsigned int i;
  gboolean all_opts_set = TRUE;

  if (name_resolve == RESOLV_NONE)
    return "FALSE";
  p = &string[0];
  for (i = 0; i < N_NAME_RESOLVE_OPT; i++) {
    if (name_resolve & name_resolve_opt[i].value)
      *p++ =  name_resolve_opt[i].letter;
    else
      all_opts_set = FALSE;
  }
  *p = '\0';
  if (all_opts_set)
    return "TRUE";
  return string;
}

char
string_to_name_resolve(char *string, guint32 *name_resolve)
{
  char c;
  unsigned int i;

  *name_resolve = 0;
  while ((c = *string++) != '\0') {
    for (i = 0; i < N_NAME_RESOLVE_OPT; i++) {
      if (c == name_resolve_opt[i].letter) {
        *name_resolve |= name_resolve_opt[i].value;
        break;
      }
    }
    if (i == N_NAME_RESOLVE_OPT) {
      /*
       * Unrecognized letter.
       */
      return c;
    }
  }
  return '\0';
}

static int
set_pref(gchar *pref_name, gchar *value)
{
  GList    *col_l, *col_l_elt;
  gint      llen;
  fmt_data *cfmt;
  unsigned long int cval;
  guint    uval;
  gboolean bval;
  gint     enum_val;
  char     *p;
  gchar    *dotp, *last_dotp;
  module_t *module;
  pref_t   *pref;
  gboolean had_a_dot;

  if (strcmp(pref_name, PRS_PRINT_FMT) == 0) {
    if (strcmp(value, pr_formats[PR_FMT_TEXT]) == 0) {
      prefs.pr_format = PR_FMT_TEXT;
    } else if (strcmp(value, pr_formats[PR_FMT_PS]) == 0) {
      prefs.pr_format = PR_FMT_PS;
    } else {
      return PREFS_SET_SYNTAX_ERR;
    }
  } else if (strcmp(pref_name, PRS_PRINT_DEST) == 0) {
    if (strcmp(value, pr_dests[PR_DEST_CMD]) == 0) {
      prefs.pr_dest = PR_DEST_CMD;
    } else if (strcmp(value, pr_dests[PR_DEST_FILE]) == 0) {
      prefs.pr_dest = PR_DEST_FILE;
    } else {
      return PREFS_SET_SYNTAX_ERR;
    }
  } else if (strcmp(pref_name, PRS_PRINT_FILE) == 0) {
    if (prefs.pr_file) g_free(prefs.pr_file);
    prefs.pr_file = g_strdup(value);
  } else if (strcmp(pref_name, PRS_PRINT_CMD) == 0) {
    if (prefs.pr_cmd) g_free(prefs.pr_cmd);
    prefs.pr_cmd = g_strdup(value);
  } else if (strcmp(pref_name, PRS_COL_FMT) == 0) {
    col_l = get_string_list(value);
    if (col_l == NULL)
      return PREFS_SET_SYNTAX_ERR;
    if ((g_list_length(col_l) % 2) != 0) {
      /* A title didn't have a matching format.  */
      clear_string_list(col_l);
      return PREFS_SET_SYNTAX_ERR;
    }
    /* Check to make sure all column formats are valid.  */
    col_l_elt = g_list_first(col_l);
    while(col_l_elt) {
      /* Make sure the title isn't empty.  */
      if (strcmp(col_l_elt->data, "") == 0) {
      	/* It is.  */
        clear_string_list(col_l);
        return PREFS_SET_SYNTAX_ERR;
      }

      /* Go past the title.  */
      col_l_elt = col_l_elt->next;

      /* Check the format.  */
      if (get_column_format_from_str(col_l_elt->data) == -1) {
        /* It's not a valid column format.  */
        clear_string_list(col_l);
        return PREFS_SET_SYNTAX_ERR;
      }

      /* Go past the format.  */
      col_l_elt = col_l_elt->next;
    }
    free_col_info(&prefs);
    prefs.col_list = NULL;
    llen             = g_list_length(col_l);
    prefs.num_cols   = llen / 2;
    col_l_elt = g_list_first(col_l);
    while(col_l_elt) {
      cfmt = (fmt_data *) g_malloc(sizeof(fmt_data));
      cfmt->title    = g_strdup(col_l_elt->data);
      col_l_elt      = col_l_elt->next;
      cfmt->fmt      = g_strdup(col_l_elt->data);
      col_l_elt      = col_l_elt->next;
      prefs.col_list = g_list_append(prefs.col_list, cfmt);
    }
    clear_string_list(col_l);
  } else if (strcmp(pref_name, PRS_STREAM_CL_FG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.st_client_fg.pixel = 0;
    prefs.st_client_fg.red   = RED_COMPONENT(cval);
    prefs.st_client_fg.green = GREEN_COMPONENT(cval);
    prefs.st_client_fg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_STREAM_CL_BG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.st_client_bg.pixel = 0;
    prefs.st_client_bg.red   = RED_COMPONENT(cval);
    prefs.st_client_bg.green = GREEN_COMPONENT(cval);
    prefs.st_client_bg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_STREAM_SR_FG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.st_server_fg.pixel = 0;
    prefs.st_server_fg.red   = RED_COMPONENT(cval);
    prefs.st_server_fg.green = GREEN_COMPONENT(cval);
    prefs.st_server_fg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_STREAM_SR_BG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.st_server_bg.pixel = 0;
    prefs.st_server_bg.red   = RED_COMPONENT(cval);
    prefs.st_server_bg.green = GREEN_COMPONENT(cval);
    prefs.st_server_bg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_GUI_SCROLLBAR_ON_RIGHT) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_scrollbar_on_right = TRUE;
    }
    else {
	    prefs.gui_scrollbar_on_right = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_PLIST_SEL_BROWSE) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_plist_sel_browse = TRUE;
    }
    else {
	    prefs.gui_plist_sel_browse = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_PTREE_SEL_BROWSE) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_ptree_sel_browse = TRUE;
    }
    else {
	    prefs.gui_ptree_sel_browse = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_ALTERN_COLORS) == 0) {
    if (strcasecmp(value, "true") == 0) {
            prefs.gui_altern_colors = TRUE;
    }
    else {
            prefs.gui_altern_colors = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_PTREE_LINE_STYLE) == 0) {
    prefs.gui_ptree_line_style =
	find_index_from_string_array(value, gui_ptree_line_style_text, 0);
  } else if (strcmp(pref_name, PRS_GUI_PTREE_EXPANDER_STYLE) == 0) {
    prefs.gui_ptree_expander_style =
	find_index_from_string_array(value, gui_ptree_expander_style_text, 1);
  } else if (strcmp(pref_name, PRS_GUI_HEX_DUMP_HIGHLIGHT_STYLE) == 0) {
    prefs.gui_hex_dump_highlight_style =
	find_index_from_string_array(value, gui_hex_dump_highlight_style_text, 1);
  } else if (strcmp(pref_name, PRS_GUI_FILTER_TOOLBAR_IN_STATUSBAR) == 0) {
    if (strcasecmp(value, "true") == 0) {
            prefs.filter_toolbar_show_in_statusbar = TRUE;
    }
    else {
            prefs.filter_toolbar_show_in_statusbar = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_TOOLBAR_MAIN_SHOW) == 0) {
    /* obsoleted by recent setting */
  } else if (strcmp(pref_name, PRS_GUI_TOOLBAR_MAIN_STYLE) == 0) {
    /* see toolbar.c for details, "icons only" is default */
	prefs.gui_toolbar_main_style =
	    find_index_from_string_array(value, gui_toolbar_style_text,
				     TB_STYLE_ICONS);
  } else if (strcmp(pref_name, PRS_GUI_FONT_NAME_1) == 0) {
    if (prefs.gui_font_name1 != NULL)
      g_free(prefs.gui_font_name1);
    prefs.gui_font_name1 = g_strdup(value);
  } else if (strcmp(pref_name, PRS_GUI_FONT_NAME_2) == 0) {
    if (prefs.gui_font_name2 != NULL)
      g_free(prefs.gui_font_name2);
    prefs.gui_font_name2 = g_strdup(value);
  } else if (strcmp(pref_name, PRS_GUI_MARKED_FG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.gui_marked_fg.pixel = 0;
    prefs.gui_marked_fg.red   = RED_COMPONENT(cval);
    prefs.gui_marked_fg.green = GREEN_COMPONENT(cval);
    prefs.gui_marked_fg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_GUI_MARKED_BG) == 0) {
    cval = strtoul(value, NULL, 16);
    prefs.gui_marked_bg.pixel = 0;
    prefs.gui_marked_bg.red   = RED_COMPONENT(cval);
    prefs.gui_marked_bg.green = GREEN_COMPONENT(cval);
    prefs.gui_marked_bg.blue  = BLUE_COMPONENT(cval);
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_SAVE_POSITION) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_geometry_save_position = TRUE;
    }
    else {
	    prefs.gui_geometry_save_position = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_SAVE_SIZE) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_geometry_save_size = TRUE;
    }
    else {
	    prefs.gui_geometry_save_size = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_SAVE_MAXIMIZED) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_geometry_save_maximized = TRUE;
    }
    else {
	    prefs.gui_geometry_save_maximized = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_MAIN_X) == 0) {         /* deprecated */
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_MAIN_Y) == 0) {         /* deprecated */
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_MAIN_WIDTH) == 0) {     /* deprecated */
  } else if (strcmp(pref_name, PRS_GUI_GEOMETRY_MAIN_HEIGHT) == 0) {    /* deprecated */
  } else if (strcmp(pref_name, PRS_GUI_CONSOLE_OPEN) == 0) {
    prefs.gui_console_open =
	find_index_from_string_array(value, gui_console_open_text,
				     console_open_never);
  } else if (strcmp(pref_name, PRS_GUI_RECENT_COUNT_MAX) == 0) {
    prefs.gui_recent_files_count_max = strtoul(value, NULL, 10);
    if (prefs.gui_recent_files_count_max == 0) {
      /* We really should put up a dialog box here ... */
      prefs.gui_recent_files_count_max = 10;
    }
  } else if (strcmp(pref_name, PRS_GUI_FILEOPEN_STYLE) == 0) {
    prefs.gui_fileopen_style =
	find_index_from_string_array(value, gui_fileopen_style_text,
				     FO_STYLE_LAST_OPENED);
  } else if (strcmp(pref_name, PRS_GUI_FILEOPEN_DIR) == 0) {
    if (prefs.gui_fileopen_dir != NULL)
      g_free(prefs.gui_fileopen_dir);
    prefs.gui_fileopen_dir = g_strdup(value);
  } else if (strcmp(pref_name, PRS_GUI_FILEOPEN_REMEMBERED_DIR) == 0) { /* deprecated */
  } else if (strcmp(pref_name, PRS_GUI_FILEOPEN_PREVIEW) == 0) {
    prefs.gui_fileopen_preview = strtoul(value, NULL, 10);
  } else if (strcmp(pref_name, PRS_GUI_ASK_UNSAVED) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_ask_unsaved = TRUE;
    }
    else {
	    prefs.gui_ask_unsaved = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_FIND_WRAP) == 0) {
    if (strcasecmp(value, "true") == 0) {
	    prefs.gui_find_wrap = TRUE;
    }
    else {
	    prefs.gui_find_wrap = FALSE;
    }
  } else if (strcmp(pref_name, PRS_GUI_WEBBROWSER) == 0) {
    g_free(prefs.gui_webbrowser);
    prefs.gui_webbrowser = g_strdup(value);
  } else if (strcmp(pref_name, PRS_GUI_WINDOW_TITLE) == 0) {
    if (prefs.gui_window_title != NULL)
      g_free(prefs.gui_window_title);
    prefs.gui_window_title = g_strdup(value);
  } else if (strcmp(pref_name, PRS_GUI_LAYOUT_TYPE) == 0) {
    prefs.gui_layout_type = strtoul(value, NULL, 10);
    if (prefs.gui_layout_type == layout_unused ||
        prefs.gui_layout_type >= layout_type_max) {
      /* XXX - report an error?  It's not a syntax error - we'd need to
         add a way of reporting a *semantic* error. */
      prefs.gui_layout_type = layout_type_5;
    }
  } else if (strcmp(pref_name, PRS_GUI_LAYOUT_CONTENT_1) == 0) {
    prefs.gui_layout_content_1 =
	find_index_from_string_array(value, gui_layout_content_text, 0);
  } else if (strcmp(pref_name, PRS_GUI_LAYOUT_CONTENT_2) == 0) {
    prefs.gui_layout_content_2 =
	find_index_from_string_array(value, gui_layout_content_text, 0);
  } else if (strcmp(pref_name, PRS_GUI_LAYOUT_CONTENT_3) == 0) {
    prefs.gui_layout_content_3 =
	find_index_from_string_array(value, gui_layout_content_text, 0);

/* handle the capture options */
  } else if (strcmp(pref_name, PRS_CAP_DEVICE) == 0) {
    if (prefs.capture_device != NULL)
      g_free(prefs.capture_device);
    prefs.capture_device = g_strdup(value);
  } else if (strcmp(pref_name, PRS_CAP_DEVICES_DESCR) == 0) {
    if (prefs.capture_devices_descr != NULL)
      g_free(prefs.capture_devices_descr);
    prefs.capture_devices_descr = g_strdup(value);
  } else if (strcmp(pref_name, PRS_CAP_DEVICES_HIDE) == 0) {
    if (prefs.capture_devices_hide != NULL)
      g_free(prefs.capture_devices_hide);
    prefs.capture_devices_hide = g_strdup(value);
  } else if (strcmp(pref_name, PRS_CAP_PROM_MODE) == 0) {
    prefs.capture_prom_mode = ((strcasecmp(value, "true") == 0)?TRUE:FALSE);
  } else if (strcmp(pref_name, PRS_CAP_REAL_TIME) == 0) {
    prefs.capture_real_time = ((strcasecmp(value, "true") == 0)?TRUE:FALSE);
  } else if (strcmp(pref_name, PRS_CAP_AUTO_SCROLL) == 0) {
    prefs.capture_auto_scroll = ((strcasecmp(value, "true") == 0)?TRUE:FALSE);
  } else if (strcmp(pref_name, PRS_CAP_SHOW_INFO) == 0) {
    prefs.capture_show_info = ((strcasecmp(value, "true") == 0)?TRUE:FALSE);

/* handle the global options */
  } else if (strcmp(pref_name, PRS_NAME_RESOLVE) == 0 ||
	     strcmp(pref_name, PRS_CAP_NAME_RESOLVE) == 0) {
    /*
     * "TRUE" and "FALSE", for backwards compatibility, are synonyms for
     * RESOLV_ALL and RESOLV_NONE.
     *
     * Otherwise, we treat it as a list of name types we want to resolve.
     */
    if (strcasecmp(value, "true") == 0)
      prefs.name_resolve = RESOLV_ALL;
    else if (strcasecmp(value, "false") == 0)
      prefs.name_resolve = RESOLV_NONE;
    else {
      prefs.name_resolve = RESOLV_NONE;	/* start out with none set */
      if (string_to_name_resolve(value, &prefs.name_resolve) != '\0')
        return PREFS_SET_SYNTAX_ERR;
    }
  } else if (strcmp(pref_name, PRS_NAME_RESOLVE_CONCURRENCY) == 0) {
    prefs.name_resolve_concurrency = strtol(value, NULL, 10);
  } else {
    /* To which module does this preference belong? */
    module = NULL;
    last_dotp = pref_name;
    had_a_dot = FALSE;
    while (!module) {
        dotp = strchr(last_dotp, '.');
        if (dotp == NULL) {
            if (had_a_dot) {
              /* no such module */
              return PREFS_SET_NO_SUCH_PREF;
            }
            else {
              /* no ".", so no module/name separator */
              return PREFS_SET_SYNTAX_ERR;
            }
        }
        else {
            had_a_dot = TRUE;
        }
        *dotp = '\0';		/* separate module and preference name */
        module = find_module(pref_name);

        /*
         * XXX - "Diameter" rather than "diameter" was used in earlier
         * versions of Ethereal; if we didn't find the module, and its name
         * was "Diameter", look for "diameter" instead.
         *
         * In addition, the BEEP protocol used to be the BXXP protocol,
         * so if we didn't find the module, and its name was "bxxp",
         * look for "beep" instead.
         *
         * Also, the preferences for GTP v0 and v1 were combined under
         * a single "gtp" heading, and the preferences for SMPP were
         * moved to "smpp-gsm-sms" and then moved to "gsm-sms-ud".
         * However, SMPP now has its own preferences, so we just map
         * "smpp-gsm-sms" to "gsm-sms-ud", and then handle SMPP below.
         */
        if (module == NULL) {
          if (strcmp(pref_name, "Diameter") == 0)
            module = find_module("diameter");
          else if (strcmp(pref_name, "bxxp") == 0)
            module = find_module("beep");
          else if (strcmp(pref_name, "gtpv0") == 0 ||
                   strcmp(pref_name, "gtpv1") == 0)
            module = find_module("gtp");
          else if (strcmp(pref_name, "smpp-gsm-sms") == 0)
            module = find_module("gsm-sms-ud");
        }
        *dotp = '.';		/* put the preference string back */
        dotp++;			/* skip past separator to preference name */
        last_dotp = dotp;
    }

    pref = find_preference(module, dotp);

    if (pref == NULL) {
      if (strcmp(module->name, "mgcp") == 0) {
        /*
         * XXX - "mgcp.display raw text toggle" and "mgcp.display dissect tree"
         * rather than "mgcp.display_raw_text" and "mgcp.display_dissect_tree"
         * were used in earlier versions of Ethereal; if we didn't find the
         * preference, it was an MGCP preference, and its name was
         * "display raw text toggle" or "display dissect tree", look for
         * "display_raw_text" or "display_dissect_tree" instead.
         *
         * "mgcp.tcp.port" and "mgcp.udp.port" are harder to handle, as both
         * the gateway and callagent ports were given those names; we interpret
         * the first as "mgcp.{tcp,udp}.gateway_port" and the second as
         * "mgcp.{tcp,udp}.callagent_port", as that's the order in which
         * they were registered by the MCCP dissector and thus that's the
         * order in which they were written to the preferences file.  (If
         * we're not reading the preferences file, but are handling stuff
         * from a "-o" command-line option, we have no clue which the user
         * had in mind - they should have used "mgcp.{tcp,udp}.gateway_port"
         * or "mgcp.{tcp,udp}.callagent_port" instead.)
         */
        if (strcmp(dotp, "display raw text toggle") == 0)
          pref = find_preference(module, "display_raw_text");
        else if (strcmp(dotp, "display dissect tree") == 0)
          pref = find_preference(module, "display_dissect_tree");
        else if (strcmp(dotp, "tcp.port") == 0) {
          mgcp_tcp_port_count++;
          if (mgcp_tcp_port_count == 1) {
            /* It's the first one */
            pref = find_preference(module, "tcp.gateway_port");
 	  } else if (mgcp_tcp_port_count == 2) {
            /* It's the second one */
            pref = find_preference(module, "tcp.callagent_port");
	  }
          /* Otherwise it's from the command line, and we don't bother
             mapping it. */
	} else if (strcmp(dotp, "udp.port") == 0) {
          mgcp_udp_port_count++;
          if (mgcp_udp_port_count == 1) {
            /* It's the first one */
            pref = find_preference(module, "udp.gateway_port");
	  } else if (mgcp_udp_port_count == 2) {
            /* It's the second one */
            pref = find_preference(module, "udp.callagent_port");
	  }
          /* Otherwise it's from the command line, and we don't bother
             mapping it. */
	}
      } else if (strcmp(module->name, "smb") == 0) {
        /* Handle old names for SMB preferences. */
        if (strcmp(dotp, "smb.trans.reassembly") == 0)
          pref = find_preference(module, "trans_reassembly");
        else if (strcmp(dotp, "smb.dcerpc.reassembly") == 0)
          pref = find_preference(module, "dcerpc_reassembly");
      } else if (strcmp(module->name, "ndmp") == 0) {
        /* Handle old names for NDMP preferences. */
        if (strcmp(dotp, "ndmp.desegment") == 0)
          pref = find_preference(module, "desegment");
      } else if (strcmp(module->name, "diameter") == 0) {
        /* Handle old names for Diameter preferences. */
        if (strcmp(dotp, "diameter.desegment") == 0)
          pref = find_preference(module, "desegment");
      } else if (strcmp(module->name, "pcli") == 0) {
        /* Handle old names for PCLI preferences. */
        if (strcmp(dotp, "pcli.udp_port") == 0)
          pref = find_preference(module, "udp_port");
      } else if (strcmp(module->name, "artnet") == 0) {
        /* Handle old names for ARTNET preferences. */
        if (strcmp(dotp, "artnet.udp_port") == 0)
          pref = find_preference(module, "udp_port");
      } else if (strcmp(module->name, "mapi") == 0) {
        /* Handle old names for MAPI preferences. */
        if (strcmp(dotp, "mapi_decrypt") == 0)
          pref = find_preference(module, "decrypt");
      } else if (strcmp(module->name, "fc") == 0) {
        /* Handle old names for Fibre Channel preferences. */
        if (strcmp(dotp, "reassemble_fc") == 0)
          pref = find_preference(module, "reassemble");
        else if (strcmp(dotp, "fc_max_frame_size") == 0)
          pref = find_preference(module, "max_frame_size");
      } else if (strcmp(module->name, "fcip") == 0) {
        /* Handle old names for Fibre Channel-over-IP preferences. */
        if (strcmp(dotp, "desegment_fcip_messages") == 0)
          pref = find_preference(module, "desegment");
        else if (strcmp(dotp, "fcip_port") == 0)
          pref = find_preference(module, "target_port");
      } else if (strcmp(module->name, "gtp") == 0) {
        /* Handle old names for GTP preferences. */
        if (strcmp(dotp, "gtpv0_port") == 0)
          pref = find_preference(module, "v0_port");
        else if (strcmp(dotp, "gtpv1c_port") == 0)
          pref = find_preference(module, "v1c_port");
        else if (strcmp(dotp, "gtpv1u_port") == 0)
          pref = find_preference(module, "v1u_port");
        else if (strcmp(dotp, "gtp_dissect_tpdu") == 0)
          pref = find_preference(module, "dissect_tpdu");
        else if (strcmp(dotp, "gtpv0_dissect_cdr_as") == 0)
          pref = find_preference(module, "v0_dissect_cdr_as");
        else if (strcmp(dotp, "gtpv0_check_etsi") == 0)
          pref = find_preference(module, "v0_check_etsi");
        else if (strcmp(dotp, "gtpv1_check_etsi") == 0)
          pref = find_preference(module, "v1_check_etsi");
      } else if (strcmp(module->name, "ip") == 0) {
        /* Handle old names for IP preferences. */
        if (strcmp(dotp, "ip_summary_in_tree") == 0)
          pref = find_preference(module, "summary_in_tree");
      } else if (strcmp(module->name, "iscsi") == 0) {
        /* Handle old names for iSCSI preferences. */
        if (strcmp(dotp, "iscsi_port") == 0)
          pref = find_preference(module, "target_port");
      } else if (strcmp(module->name, "lmp") == 0) {
        /* Handle old names for LMP preferences. */
        if (strcmp(dotp, "lmp_version") == 0)
          pref = find_preference(module, "version");
      } else if (strcmp(module->name, "mtp3") == 0) {
        /* Handle old names for MTP3 preferences. */
        if (strcmp(dotp, "mtp3_standard") == 0)
          pref = find_preference(module, "standard");
      } else if (strcmp(module->name, "nlm") == 0) {
        /* Handle old names for NLM preferences. */
        if (strcmp(dotp, "nlm_msg_res_matching") == 0)
          pref = find_preference(module, "msg_res_matching");
      } else if (strcmp(module->name, "ppp") == 0) {
        /* Handle old names for PPP preferences. */
        if (strcmp(dotp, "ppp_fcs") == 0)
          pref = find_preference(module, "fcs_type");
        else if (strcmp(dotp, "ppp_vj") == 0)
          pref = find_preference(module, "decompress_vj");
      } else if (strcmp(module->name, "rsvp") == 0) {
        /* Handle old names for RSVP preferences. */
        if (strcmp(dotp, "rsvp_process_bundle") == 0)
          pref = find_preference(module, "process_bundle");
      } else if (strcmp(module->name, "tcp") == 0) {
        /* Handle old names for TCP preferences. */
        if (strcmp(dotp, "tcp_summary_in_tree") == 0)
          pref = find_preference(module, "summary_in_tree");
        else if (strcmp(dotp, "tcp_analyze_sequence_numbers") == 0)
          pref = find_preference(module, "analyze_sequence_numbers");
        else if (strcmp(dotp, "tcp_relative_sequence_numbers") == 0)
          pref = find_preference(module, "relative_sequence_numbers");
      } else if (strcmp(module->name, "udp") == 0) {
        /* Handle old names for UDP preferences. */
        if (strcmp(dotp, "udp_summary_in_tree") == 0)
          pref = find_preference(module, "summary_in_tree");
      } else if (strcmp(module->name, "ndps") == 0) {
        /* Handle old names for NDPS preferences. */
        if (strcmp(dotp, "desegment_ndps") == 0)
          pref = find_preference(module, "desegment_tcp");
      } else if (strcmp(module->name, "http") == 0) {
        /* Handle old names for HTTP preferences. */
        if (strcmp(dotp, "desegment_http_headers") == 0)
          pref = find_preference(module, "desegment_headers");
        else if (strcmp(dotp, "desegment_http_body") == 0)
          pref = find_preference(module, "desegment_body");
      } else if (strcmp(module->name, "smpp") == 0) {
        /* Handle preferences that moved from SMPP. */
        module_t *new_module = find_module("gsm-sms-ud");
        if (strcmp(dotp, "port_number_udh_means_wsp") == 0)
          pref = find_preference(new_module, "port_number_udh_means_wsp");
        else if (strcmp(dotp, "try_dissect_1st_fragment") == 0)
          pref = find_preference(new_module, "try_dissect_1st_fragment");
      } else if (strcmp(module->name, "asn1") == 0) {
        /* Handle old generic ASN.1 preferences (it's not really a
           rename, as the new preferences support multiple ports,
           but we might as well copy them over). */
        if (strcmp(dotp, "tcp_port") == 0)
          pref = find_preference(module, "tcp_ports");
        else if (strcmp(dotp, "udp_port") == 0)
          pref = find_preference(module, "udp_ports");
        else if (strcmp(dotp, "sctp_port") == 0)
          pref = find_preference(module, "sctp_ports");
      } else if (strcmp(module->name, "llcgprs") == 0) {
        if (strcmp(dotp, "ignore_cipher_bit") == 0)
          pref = find_preference(module, "autodetect_cipher_bit");
      }
    }
    if (pref == NULL)
      return PREFS_SET_NO_SUCH_PREF;	/* no such preference */

    switch (pref->type) {

    case PREF_UINT:
      uval = strtoul(value, &p, pref->info.base);
      if (p == value || *p != '\0')
        return PREFS_SET_SYNTAX_ERR;	/* number was bad */
      if (*pref->varp.uint != uval) {
        module->prefs_changed = TRUE;
        *pref->varp.uint = uval;
      }
      break;

    case PREF_BOOL:
      /* XXX - give an error if it's neither "true" nor "false"? */
      if (strcasecmp(value, "true") == 0)
        bval = TRUE;
      else
        bval = FALSE;
      if (*pref->varp.boolp != bval) {
	module->prefs_changed = TRUE;
	*pref->varp.boolp = bval;
      }
      break;

    case PREF_ENUM:
      /* XXX - give an error if it doesn't match? */
      enum_val = find_val_for_string(value,
					pref->info.enum_info.enumvals, 1);
      if (*pref->varp.enump != enum_val) {
	module->prefs_changed = TRUE;
	*pref->varp.enump = enum_val;
      }
      break;

    case PREF_STRING:
      if (strcmp(*pref->varp.string, value) != 0) {
        module->prefs_changed = TRUE;
        g_free((void *)*pref->varp.string);
        *pref->varp.string = g_strdup(value);
      }
      break;

    case PREF_RANGE:
    {
      range_t *newrange;

      if (range_convert_str(&newrange, value, pref->info.max_value) !=
          CVT_NO_ERROR) {
        /* XXX - distinguish between CVT_SYNTAX_ERROR and
           CVT_NUMBER_TOO_BIG */
        return PREFS_SET_SYNTAX_ERR;	/* number was bad */
      }

      if (!ranges_are_equal(*pref->varp.range, newrange)) {
	module->prefs_changed = TRUE;
	g_free(*pref->varp.range);
	*pref->varp.range = newrange;
      }
      break;
    }

    case PREF_OBSOLETE:
      return PREFS_SET_OBSOLETE;	/* no such preference any more */
    }
  }

  return PREFS_SET_OK;
}

typedef struct {
	module_t *module;
	FILE	*pf;
} write_pref_arg_t;

/*
 * Write out a single preference.
 */
static void
write_pref(gpointer data, gpointer user_data)
{
	pref_t *pref = data;
	write_pref_arg_t *arg = user_data;
	const enum_val_t *enum_valp;
	const char *val_string;

	if (pref->type == PREF_OBSOLETE) {
		/*
		 * This preference is no longer supported; it's not a
		 * real preference, so we don't write it out (i.e., we
		 * treat it as if it weren't found in the list of
		 * preferences, and we weren't called in the first place).
		 */
		return;
	}

	fprintf(arg->pf, "\n# %s\n", pref->description);

	switch (pref->type) {

	case PREF_UINT:
		switch (pref->info.base) {

		case 10:
			fprintf(arg->pf, "# A decimal number.\n");
			fprintf(arg->pf, "%s.%s: %u\n", arg->module->name,
			    pref->name, *pref->varp.uint);
			break;

		case 8:
			fprintf(arg->pf, "# An octal number.\n");
			fprintf(arg->pf, "%s.%s: %#o\n", arg->module->name,
			    pref->name, *pref->varp.uint);
			break;

		case 16:
			fprintf(arg->pf, "# A hexadecimal number.\n");
			fprintf(arg->pf, "%s.%s: %#x\n", arg->module->name,
			    pref->name, *pref->varp.uint);
			break;
		}
		break;

	case PREF_BOOL:
		fprintf(arg->pf, "# TRUE or FALSE (case-insensitive).\n");
		fprintf(arg->pf, "%s.%s: %s\n", arg->module->name, pref->name,
		    *pref->varp.boolp ? "TRUE" : "FALSE");
		break;

	case PREF_ENUM:
		/*
		 * For now, we save the "description" value, so that if we
		 * save the preferences older versions of Ethereal can at
		 * least read preferences that they supported; we support
		 * either the short name or the description when reading
		 * the preferences file or a "-o" option.
		 */
		fprintf(arg->pf, "# One of: ");
		enum_valp = pref->info.enum_info.enumvals;
		val_string = NULL;
		while (enum_valp->name != NULL) {
			if (enum_valp->value == *pref->varp.enump)
				val_string = enum_valp->description;
			fprintf(arg->pf, "%s", enum_valp->description);
			enum_valp++;
			if (enum_valp->name == NULL)
				fprintf(arg->pf, "\n");
			else
				fprintf(arg->pf, ", ");
		}
		fprintf(arg->pf, "# (case-insensitive).\n");
		fprintf(arg->pf, "%s.%s: %s\n", arg->module->name,
		    pref->name, val_string);
		break;

	case PREF_STRING:
		fprintf(arg->pf, "# A string.\n");
		fprintf(arg->pf, "%s.%s: %s\n", arg->module->name, pref->name,
		    *pref->varp.string);
		break;

	case PREF_RANGE:
	{
		char *range_string;

		range_string = range_convert_range(*pref->varp.range);
		fprintf(arg->pf, "# A string denoting an positive integer range (e.g., \"1-20,30-40\").\n");
		fprintf(arg->pf, "%s.%s: %s\n", arg->module->name, pref->name,
			range_string);
		g_free(range_string);
		break;
	}

	case PREF_OBSOLETE:
		g_assert_not_reached();
		break;
	}
}

static void
write_module_prefs(gpointer data, gpointer user_data)
{
	write_pref_arg_t arg;

	arg.module = data;
	arg.pf = user_data;
	g_list_foreach(arg.module->prefs, write_pref, &arg);
}

/* Write out "prefs" to the user's preferences file, and return 0.

   If the preferences file path is NULL, write to stdout.

   If we got an error, stuff a pointer to the path of the preferences file
   into "*pf_path_return", and return the errno. */
int
write_prefs(char **pf_path_return)
{
  char        *pf_path;
  FILE        *pf;
  GList       *clp, *col_l;
  fmt_data    *cfmt;

  /* Needed for "-G defaultprefs" */
  init_prefs();

  /* To do:
   * - Split output lines longer than MAX_VAL_LEN
   * - Create a function for the preference directory check/creation
   *   so that duplication can be avoided with filter.c
   */

  if (pf_path_return != NULL) {
    pf_path = get_persconffile_path(PF_NAME, TRUE);
    if ((pf = fopen(pf_path, "w")) == NULL) {
      *pf_path_return = pf_path;
      return errno;
    }
  } else {
    pf = stdout;
  }

  fputs("# Configuration file for Ethereal " VERSION ".\n"
    "#\n"
    "# This file is regenerated each time preferences are saved within\n"
    "# Ethereal.  Making manual changes should be safe, however.\n", pf);

  fprintf (pf, "\n######## User Interface ########\n");
  
  fprintf(pf, "\n# Vertical scrollbars should be on right side?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_SCROLLBAR_ON_RIGHT ": %s\n",
		  prefs.gui_scrollbar_on_right == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Packet-list selection bar can be used to browse w/o selecting?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_PLIST_SEL_BROWSE ": %s\n",
		  prefs.gui_plist_sel_browse == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Protocol-tree selection bar can be used to browse w/o selecting?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_PTREE_SEL_BROWSE ": %s\n",
		  prefs.gui_ptree_sel_browse == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Alternating colors in TreeViews?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_ALTERN_COLORS ": %s\n",
		  prefs.gui_altern_colors == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Place filter toolbar inside the statusbar?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_FILTER_TOOLBAR_IN_STATUSBAR ": %s\n",
                 prefs.filter_toolbar_show_in_statusbar == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Protocol-tree line style.\n");
  fprintf(pf, "# One of: NONE, SOLID, DOTTED, TABBED\n");
  fprintf(pf, PRS_GUI_PTREE_LINE_STYLE ": %s\n",
          gui_ptree_line_style_text[prefs.gui_ptree_line_style]);

  fprintf(pf, "\n# Protocol-tree expander style.\n");
  fprintf(pf, "# One of: NONE, SQUARE, TRIANGLE, CIRCULAR\n");
  fprintf(pf, PRS_GUI_PTREE_EXPANDER_STYLE ": %s\n",
		  gui_ptree_expander_style_text[prefs.gui_ptree_expander_style]);

  fprintf(pf, "\n# Hex dump highlight style.\n");
  fprintf(pf, "# One of: BOLD, INVERSE\n");
  fprintf(pf, PRS_GUI_HEX_DUMP_HIGHLIGHT_STYLE ": %s\n",
		  gui_hex_dump_highlight_style_text[prefs.gui_hex_dump_highlight_style]);

  fprintf(pf, "\n# Main Toolbar style.\n");
  fprintf(pf, "# One of: ICONS, TEXT, BOTH\n");
  fprintf(pf, PRS_GUI_TOOLBAR_MAIN_STYLE ": %s\n",
		  gui_toolbar_style_text[prefs.gui_toolbar_main_style]);

  fprintf(pf, "\n# Save window position at exit?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_GEOMETRY_SAVE_POSITION ": %s\n",
		  prefs.gui_geometry_save_position == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Save window size at exit?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_GEOMETRY_SAVE_SIZE ": %s\n",
		  prefs.gui_geometry_save_size == TRUE ? "TRUE" : "FALSE");
                  
  fprintf(pf, "\n# Save window maximized state at exit (GTK2 only)?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_GEOMETRY_SAVE_MAXIMIZED ": %s\n",
		  prefs.gui_geometry_save_maximized == TRUE ? "TRUE" : "FALSE");
                  
  fprintf(pf, "\n# Open a console window (WIN32 only)?\n");
  fprintf(pf, "# One of: NEVER, AUTOMATIC, ALWAYS\n");
  fprintf(pf, PRS_GUI_CONSOLE_OPEN ": %s\n",
		  gui_console_open_text[prefs.gui_console_open]);

  fprintf(pf, "\n# The max. number of items in the open recent files list.\n");
  fprintf(pf, "# A decimal number.\n");
  fprintf(pf, PRS_GUI_RECENT_COUNT_MAX ": %d\n",
	          prefs.gui_recent_files_count_max);

  fprintf(pf, "\n# Where to start the File Open dialog box.\n");
  fprintf(pf, "# One of: LAST_OPENED, SPECIFIED\n");
  fprintf(pf, PRS_GUI_FILEOPEN_STYLE ": %s\n",
		  gui_fileopen_style_text[prefs.gui_fileopen_style]);

  if (prefs.gui_fileopen_dir != NULL) {
    fprintf(pf, "\n# Directory to start in when opening File Open dialog.\n");
    fprintf(pf, PRS_GUI_FILEOPEN_DIR ": %s\n",
                  prefs.gui_fileopen_dir);
  }

  fprintf(pf, "\n# The preview timeout in the File Open dialog.\n");
  fprintf(pf, "# A decimal number (in seconds).\n");
  fprintf(pf, PRS_GUI_FILEOPEN_PREVIEW ": %d\n",
	          prefs.gui_fileopen_preview);
  
  fprintf(pf, "\n# Ask to save unsaved capture files?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_ASK_UNSAVED ": %s\n",
		  prefs.gui_ask_unsaved == TRUE ? "TRUE" : "FALSE");                  

  fprintf(pf, "\n# Wrap to beginning/end of file during search?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_GUI_FIND_WRAP ": %s\n",
		  prefs.gui_find_wrap == TRUE ? "TRUE" : "FALSE");                  

  fprintf(pf, "\n# The path to the webbrowser.\n");
  fprintf(pf, "# Ex: mozilla %%s\n");
  fprintf(pf, PRS_GUI_WEBBROWSER ": %s\n", prefs.gui_webbrowser);

  fprintf(pf, "\n# Custom window title. (Prepended to existing titles.)\n");
  fprintf(pf, PRS_GUI_WINDOW_TITLE ": %s\n",
              prefs.gui_window_title);

  fprintf (pf, "\n######## User Interface: Layout ########\n");

  fprintf(pf, "\n# Layout type (1-6).\n");
  fprintf(pf, PRS_GUI_LAYOUT_TYPE ": %d\n",
	          prefs.gui_layout_type);

  fprintf(pf, "\n# Layout content of the panes (1-3).\n");
  fprintf(pf, "# One of: NONE, PLIST, PDETAILS, PBYTES\n");
  fprintf(pf, PRS_GUI_LAYOUT_CONTENT_1 ": %s\n",
	          gui_layout_content_text[prefs.gui_layout_content_1]);
  fprintf(pf, PRS_GUI_LAYOUT_CONTENT_2 ": %s\n",
	          gui_layout_content_text[prefs.gui_layout_content_2]);
  fprintf(pf, PRS_GUI_LAYOUT_CONTENT_3 ": %s\n",
	          gui_layout_content_text[prefs.gui_layout_content_3]);

  fprintf (pf, "\n######## User Interface: Columns ########\n");
  
  clp = prefs.col_list;
  col_l = NULL;
  while (clp) {
    cfmt = (fmt_data *) clp->data;
    col_l = g_list_append(col_l, cfmt->title);
    col_l = g_list_append(col_l, cfmt->fmt);
    clp = clp->next;
  }
  fprintf (pf, "\n# Packet list column format.\n");
  fprintf (pf, "# Each pair of strings consists of a column title and its format.\n");
  fprintf (pf, "%s: %s\n", PRS_COL_FMT, put_string_list(col_l));
  /* This frees the list of strings, but not the strings to which it
     refers; that's what we want, as we haven't copied those strings,
     we just referred to them.  */
  g_list_free(col_l);

  fprintf (pf, "\n######## User Interface: Font ########\n");

  fprintf(pf, "\n# Font name for packet list, protocol tree, and hex dump panes (GTK version 1).\n");
  fprintf(pf, PRS_GUI_FONT_NAME_1 ": %s\n", prefs.gui_font_name1);

  fprintf(pf, "\n# Font name for packet list, protocol tree, and hex dump panes (GTK version 2).\n");
  fprintf(pf, PRS_GUI_FONT_NAME_2 ": %s\n", prefs.gui_font_name2);

  fprintf (pf, "\n######## User Interface: Colors ########\n");

  fprintf (pf, "\n# Color preferences for a marked frame.\n");
  fprintf (pf, "# Each value is a six digit hexadecimal color value in the form rrggbb.\n");
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_GUI_MARKED_FG,
    (prefs.gui_marked_fg.red * 255 / 65535),
    (prefs.gui_marked_fg.green * 255 / 65535),
    (prefs.gui_marked_fg.blue * 255 / 65535));
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_GUI_MARKED_BG,
    (prefs.gui_marked_bg.red * 255 / 65535),
    (prefs.gui_marked_bg.green * 255 / 65535),
    (prefs.gui_marked_bg.blue * 255 / 65535));

  fprintf (pf, "\n# TCP stream window color preferences.\n");
  fprintf (pf, "# Each value is a six digit hexadecimal color value in the form rrggbb.\n");
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_STREAM_CL_FG,
    (prefs.st_client_fg.red * 255 / 65535),
    (prefs.st_client_fg.green * 255 / 65535),
    (prefs.st_client_fg.blue * 255 / 65535));
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_STREAM_CL_BG,
    (prefs.st_client_bg.red * 255 / 65535),
    (prefs.st_client_bg.green * 255 / 65535),
    (prefs.st_client_bg.blue * 255 / 65535));
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_STREAM_SR_FG,
    (prefs.st_server_fg.red * 255 / 65535),
    (prefs.st_server_fg.green * 255 / 65535),
    (prefs.st_server_fg.blue * 255 / 65535));
  fprintf (pf, "%s: %02x%02x%02x\n", PRS_STREAM_SR_BG,
    (prefs.st_server_bg.red * 255 / 65535),
    (prefs.st_server_bg.green * 255 / 65535),
    (prefs.st_server_bg.blue * 255 / 65535));

  fprintf(pf, "\n####### Capture ########\n");
  
  if (prefs.capture_device != NULL) {
    fprintf(pf, "\n# Default capture device\n");
    fprintf(pf, PRS_CAP_DEVICE ": %s\n", prefs.capture_device);
  }

  if (prefs.capture_devices_descr != NULL) {
    fprintf(pf, "\n# Interface descriptions.\n");
    fprintf(pf, "# Ex: eth0(eth0 descr),eth1(eth1 descr),...\n");
    fprintf(pf, PRS_CAP_DEVICES_DESCR ": %s\n", prefs.capture_devices_descr);
  }

  if (prefs.capture_devices_hide != NULL) {
    fprintf(pf, "\n# Hide interface?\n");
    fprintf(pf, "# Ex: eth0,eth3,...\n");
    fprintf(pf, PRS_CAP_DEVICES_HIDE ": %s\n", prefs.capture_devices_hide);
  }

  fprintf(pf, "\n# Capture in promiscuous mode?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_CAP_PROM_MODE ": %s\n",
		  prefs.capture_prom_mode == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Update packet list in real time during capture?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_CAP_REAL_TIME ": %s\n",
		  prefs.capture_real_time == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Scroll packet list during capture?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_CAP_AUTO_SCROLL ": %s\n",
		  prefs.capture_auto_scroll == TRUE ? "TRUE" : "FALSE");

  fprintf(pf, "\n# Show capture info dialog while capturing?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive).\n");
  fprintf(pf, PRS_CAP_SHOW_INFO ": %s\n",
		  prefs.capture_show_info == TRUE ? "TRUE" : "FALSE");

  fprintf (pf, "\n######## Printing ########\n");

  fprintf (pf, "\n# Can be one of \"text\" or \"postscript\".\n"
    "print.format: %s\n", pr_formats[prefs.pr_format]);

  fprintf (pf, "\n# Can be one of \"command\" or \"file\".\n"
    "print.destination: %s\n", pr_dests[prefs.pr_dest]);

  fprintf (pf, "\n# This is the file that gets written to when the "
    "destination is set to \"file\"\n"
    "%s: %s\n", PRS_PRINT_FILE, prefs.pr_file);

  fprintf (pf, "\n# Output gets piped to this command when the destination "
    "is set to \"command\"\n"
    "%s: %s\n", PRS_PRINT_CMD, prefs.pr_cmd);

  fprintf(pf, "\n####### Name Resolution ########\n");
  
  fprintf(pf, "\n# Resolve addresses to names?\n");
  fprintf(pf, "# TRUE or FALSE (case-insensitive), or a list of address types to resolve.\n");
  fprintf(pf, PRS_NAME_RESOLVE ": %s\n",
		  name_resolve_to_string(prefs.name_resolve));

  fprintf(pf, "\n# Name resolution concurrency.\n");
  fprintf(pf, "# A decimal number.\n");
  fprintf(pf, PRS_NAME_RESOLVE_CONCURRENCY ": %d\n",
		  prefs.name_resolve_concurrency);

  fprintf(pf, "\n####### Protocols ########\n");

  g_list_foreach(modules, write_module_prefs, pf);

  fclose(pf);

  /* XXX - catch I/O errors (e.g. "ran out of disk space") and return
     an error indication, or maybe write to a new preferences file and
     rename that file on top of the old one only if there are not I/O
     errors. */
  return 0;
}

/* Copy a set of preferences. */
void
copy_prefs(e_prefs *dest, e_prefs *src)
{
  fmt_data *src_cfmt, *dest_cfmt;
  GList *entry;

  dest->pr_format = src->pr_format;
  dest->pr_dest = src->pr_dest;
  dest->pr_file = g_strdup(src->pr_file);
  dest->pr_cmd = g_strdup(src->pr_cmd);
  dest->col_list = NULL;
  for (entry = src->col_list; entry != NULL; entry = g_list_next(entry)) {
    src_cfmt = entry->data;
    dest_cfmt = (fmt_data *) g_malloc(sizeof(fmt_data));
    dest_cfmt->title = g_strdup(src_cfmt->title);
    dest_cfmt->fmt = g_strdup(src_cfmt->fmt);
    dest->col_list = g_list_append(dest->col_list, dest_cfmt);
  }
  dest->num_cols = src->num_cols;
  dest->st_client_fg = src->st_client_fg;
  dest->st_client_bg = src->st_client_bg;
  dest->st_server_fg = src->st_server_fg;
  dest->st_server_bg = src->st_server_bg;
  dest->gui_scrollbar_on_right = src->gui_scrollbar_on_right;
  dest->gui_plist_sel_browse = src->gui_plist_sel_browse;
  dest->gui_ptree_sel_browse = src->gui_ptree_sel_browse;
  dest->gui_altern_colors = src->gui_altern_colors;
  dest->filter_toolbar_show_in_statusbar = src->filter_toolbar_show_in_statusbar;
  dest->gui_ptree_line_style = src->gui_ptree_line_style;
  dest->gui_ptree_expander_style = src->gui_ptree_expander_style;
  dest->gui_hex_dump_highlight_style = src->gui_hex_dump_highlight_style;
  dest->gui_toolbar_main_style = src->gui_toolbar_main_style;
  dest->gui_fileopen_dir = g_strdup(src->gui_fileopen_dir);
  dest->gui_console_open = src->gui_console_open;
  dest->gui_fileopen_style = src->gui_fileopen_style;
  dest->gui_fileopen_preview = src->gui_fileopen_preview;
  dest->gui_ask_unsaved = src->gui_ask_unsaved;
  dest->gui_find_wrap = src->gui_find_wrap;
  dest->gui_layout_type = src->gui_layout_type;
  dest->gui_layout_content_1 = src->gui_layout_content_1;
  dest->gui_layout_content_2 = src->gui_layout_content_2;
  dest->gui_layout_content_3 = src->gui_layout_content_3;
  dest->gui_font_name1 = g_strdup(src->gui_font_name1);
  dest->gui_font_name2 = g_strdup(src->gui_font_name2);
  dest->gui_marked_fg = src->gui_marked_fg;
  dest->gui_marked_bg = src->gui_marked_bg;
  dest->gui_geometry_save_position = src->gui_geometry_save_position;
  dest->gui_geometry_save_size = src->gui_geometry_save_size;
  dest->gui_geometry_save_maximized = src->gui_geometry_save_maximized;
  dest->gui_webbrowser = g_strdup(src->gui_webbrowser);
  dest->gui_window_title = g_strdup(src->gui_window_title);
/*  values for the capture dialog box */
  dest->capture_device = g_strdup(src->capture_device);
  dest->capture_devices_descr = g_strdup(src->capture_devices_descr);
  dest->capture_devices_hide = g_strdup(src->capture_devices_hide);
  dest->capture_prom_mode = src->capture_prom_mode;
  dest->capture_real_time = src->capture_real_time;
  dest->capture_auto_scroll = src->capture_auto_scroll;
  dest->capture_show_info = src->capture_show_info;
  dest->name_resolve = src->name_resolve;
  dest->name_resolve_concurrency = src->name_resolve_concurrency;

}

/* Free a set of preferences. */
void
free_prefs(e_prefs *pr)
{
  if (pr->pr_file != NULL) {
    g_free(pr->pr_file);
    pr->pr_file = NULL;
  }
  if (pr->pr_cmd != NULL) {
    g_free(pr->pr_cmd);
    pr->pr_cmd = NULL;
  }
  free_col_info(pr);
  if (pr->gui_font_name1 != NULL) {
    g_free(pr->gui_font_name1);
    pr->gui_font_name1 = NULL;
  }
  if (pr->gui_font_name2 != NULL) {
    g_free(pr->gui_font_name2);
    pr->gui_font_name2 = NULL;
  }
  if (pr->gui_fileopen_dir != NULL) {
    g_free(pr->gui_fileopen_dir);
    pr->gui_fileopen_dir = NULL;
  }
  g_free(pr->gui_webbrowser);
  pr->gui_webbrowser = NULL;
  if (pr->gui_window_title != NULL) {
    g_free(pr->gui_window_title);
    pr->gui_window_title = NULL;
  }
  if (pr->capture_device != NULL) {
    g_free(pr->capture_device);
    pr->capture_device = NULL;
  }
  if (pr->capture_devices_descr != NULL) {
    g_free(pr->capture_devices_descr);
    pr->capture_devices_descr = NULL;
  }
  if (pr->capture_devices_hide != NULL) {
    g_free(pr->capture_devices_hide);
    pr->capture_devices_hide = NULL;
  }
}

static void
free_col_info(e_prefs *pr)
{
  fmt_data *cfmt;

  while (pr->col_list != NULL) {
    cfmt = pr->col_list->data;
    g_free(cfmt->title);
    g_free(cfmt->fmt);
    g_free(cfmt);
    pr->col_list = g_list_remove_link(pr->col_list, pr->col_list);
  }
  g_list_free(pr->col_list);
  pr->col_list = NULL;
}