aboutsummaryrefslogtreecommitdiffstats
path: root/src/liboptions/options.c
blob: f9cec12c235858102154f6020ed32e04ef62f29c (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
/* command line options and config file parsing
 *
 * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
 * All Rights Reserved
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "options.h"
#include "../libdebug/debug.h"

typedef struct option {
	struct option *next;
	int short_option;
	const char *long_option;
	int parameter_count;
} option_t;

static option_t *option_head = NULL;
static option_t **option_tailp = &option_head;
static int first_option = 1;

void option_add(int short_option, const char *long_option, int parameter_count)
{
	option_t *option;

	/* check if option already exists */
	for (option = option_head; option; option = option->next) {
		if (option->short_option == short_option
		 || !strcmp(option->long_option, long_option)) {
			PDEBUG(DOPTIONS, DEBUG_ERROR, "Option '%s' added twice, please fix!\n", option->long_option);
			abort();
		}
	}

	option = calloc(1, sizeof(*option));
	if (!option) {
		PDEBUG(DOPTIONS, DEBUG_ERROR, "No mem!\n");
		abort();
	}

	option->short_option = short_option;
	option->long_option = long_option;
	option->parameter_count = parameter_count;
	*option_tailp = option;
	option_tailp = &(option->next);
}

// FIXME: support more than one option */
int options_config_file(const char *config_file, int (*handle_options)(int short_option, int argi, char *argv[]))
{
	static const char *home;
	char config[256];
	FILE *fp;
	char buffer[256], opt[256], param[256], *p, *argv[1];
	int line;
	int rc = 1;
	int i;
	option_t *option;

	/* open config file */
	home = getenv("HOME");
        if (home == NULL)
		return 1;
	sprintf(config, "%s/%s", home, config_file + 2);
		
	fp = fopen(config, "r");
	if (!fp) {
		PDEBUG(DOPTIONS, DEBUG_INFO, "Config file '%s' seems not to exist, using command line options only.\n", config);
		return 1;
	}

	/* parse config file */
	line = 0;
	while((fgets(buffer, sizeof(buffer), fp))) {
		line++;
		/* prevent buffer overflow */
		buffer[sizeof(buffer) - 1] = '\0';
		/* cut away new-line and white spaces */
		while (buffer[0] && buffer[strlen(buffer) - 1] <= ' ')
			 buffer[strlen(buffer) - 1] = '\0';
		p = buffer;
		/* remove white spaces in front of first keyword */
		while (*p > '\0' && *p <= ' ')
			p++;
		/* ignore '#' lines */
		if (*p == '#')
			continue;
		/* get option form line */
		i = 0;
		while (*p > ' ')
			opt[i++] = *p++;
		opt[i] = '\0';
		if (opt[0] == '\0')
			continue;
		/* skip white spaces behind option */
		while (*p > '\0' && *p <= ' ')
			p++;
		/* get param from line */
		i = 0;
		while (*p > ' ')
			param[i++] = *p++;
		param[i] = '\0';
		/* search option */
		for (option = option_head; option; option = option->next) {
			if (opt[0] == option->short_option && opt[1] == '\0') {
				PDEBUG(DOPTIONS, DEBUG_INFO, "Config file option '%s' ('%s'), parameter '%s'\n", opt, option->long_option, param);
				break;
			}
			if (!strcmp(opt, option->long_option)) {
				PDEBUG(DOPTIONS, DEBUG_INFO, "Config file option '%s', parameter '%s'\n", opt, param);
				break;
			}
		}
		if (!option) {
			PDEBUG(DOPTIONS, DEBUG_ERROR, "Given option '%s' in config file '%s' at line %d is not a valid option, use '-h' for help!\n", opt, config_file, line);
			rc = -EINVAL;
			goto done;
		}
		if (option->parameter_count && !param[0]) {
			PDEBUG(DOPTIONS, DEBUG_ERROR, "Given option '%s' in config file '%s' at line %d requires %d parameter(s), use '-h' for help!\n", opt, config_file, line,  option->parameter_count);
			return -EINVAL;
		}
		argv[0] = strdup(param);
		rc = handle_options(option->short_option, 0, argv);
		if (rc <= 0)
			goto done;
		first_option = 0;
	}

done:
	/* close config file */
	fclose(fp);

	return rc;
}

int options_command_line(int argc, char *argv[], int (*handle_options)(int short_option, int argi, char *argv[]))
{
	option_t *option;
	int argi, i;
	int rc;

	for (argi = 1; argi < argc; argi++) {
		if (argv[argi][0] == '-') {
			if (argv[argi][1] != '-') {
				if (strlen(argv[argi]) != 2) {
					PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' exceeds one character, use '-h' for help!\n", argv[argi]);
					return -EINVAL;
				}
				/* -x */
				for (option = option_head; option; option = option->next) {
					if (argv[argi][1] == option->short_option) {
						if (option->parameter_count && argi + option->parameter_count < argc)
							PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s' ('--%s'), parameter '%s'\n", argv[argi], option->long_option, argv[argi + 1]);
						else
							PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s' ('--%s')\n", argv[argi], option->long_option);
						break;
					}
				}
			} else {
				/* --xxxxxx */
				for (option = option_head; option; option = option->next) {
					if (!strcmp(argv[argi] + 2, option->long_option)) {
						if (option->parameter_count && argi + option->parameter_count < argc)
							PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s', parameter '%s'\n", argv[argi], argv[argi + 1]);
						else
							PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s'\n", argv[argi]);
						break;
					}
				}
			}
			if (!option) {
				PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' is not a valid option, use '-h' for help!\n", argv[argi]);
				return -EINVAL;
			}
			if (argi + option->parameter_count >= argc) {
				PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' requires %d parameter(s), use '-h' for help!\n", argv[argi], option->parameter_count);
				return -EINVAL;
			}
			rc = handle_options(option->short_option, argi + 1, argv);
			if (rc <= 0)
				return rc;
			first_option = 0;
			argi += option->parameter_count;
		} else
			break;
	}

	/* no more options, so we check if there is an option after a non-option parameter */
	for (i = argi; i < argc; i++) {
		if (argv[i][0] == '-') {
			PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' behind command line parameter '%s' not allowed! Please put all command line options before command line parameter(s).\n", argv[i], argv[argi]);
			return -EINVAL;
		}
	}

	return argi;
}

int option_is_first(void)
{
	return first_option;
}