/* * Asterisk -- An open source telephony toolkit. * * Copyright (C) 1999 - 2005, Digium, Inc. * * Mark Spencer * * Most of this code is in the public domain, so clarified as of * June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov). * * All modifications to this code to abstract timezones away from * the environment are by Tilghman Lesher, , with * the copyright assigned to Digium. * * See http://www.asterisk.org for more information about * the Asterisk project. Please do not directly contact * any of the maintainers of this project for assistance; * the project provides a web site, mailing lists and IRC * channels for your use. * * This program is free software, distributed under the terms of * the GNU General Public License Version 2. See the LICENSE file * at the top of the source tree. */ /*! \file * * Multi-timezone Localtime code * * \author Leap second handling Bradley White (bww@k.gp.cs.cmu.edu). * \author POSIX-style TZ environment variable handling from Guy Harris (guy@auspex.com). * */ /* * Asterisk defines * * Don't mess with these unless you're really sure you know what you're doing. */ #ifndef _THREAD_SAFE #define _THREAD_SAFE #endif #define TZ_STRLEN_MAX 255 /* #define DEBUG */ /*LINTLIBRARY*/ #include #include #include #ifdef DEBUG #include #endif #include "private.h" #include "tzfile.h" #include "asterisk/lock.h" #include "asterisk/localtime.h" #include "asterisk/strings.h" #ifndef lint #ifndef NOID static const char elsieid[] = "@(#)localtime.c 7.57"; #endif /* !defined NOID */ #endif /* !defined lint */ /* ** SunOS 4.1.1 headers lack O_BINARY. */ #ifdef O_BINARY #define OPEN_MODE (O_RDONLY | O_BINARY) #endif /* defined O_BINARY */ #ifndef O_BINARY #define OPEN_MODE O_RDONLY #endif /* !defined O_BINARY */ #ifdef SOLARIS #undef TM_ZONE #undef TM_GMTOFF #endif #ifdef TM_ZONE #ifndef WILDABBR /*! \note * Someone might make incorrect use of a time zone abbreviation: * 1. They might reference tzname[0] before calling ast_tzset (explicitly * or implicitly). * 2. They might reference tzname[1] before calling ast_tzset (explicitly * or implicitly). * 3. They might reference tzname[1] after setting to a time zone * in which Daylight Saving Time is never observed. * 4. They might reference tzname[0] after setting to a time zone * in which Standard Time is never observed. * 5. They might reference tm.TM_ZONE after calling offtime. * What's best to do in the above cases is open to debate; * for now, we just set things up so that in any of the five cases * WILDABBR is used. Another possibility: initialize tzname[0] to the * string "tzname[0] used before set", and similarly for the other cases. * And another: initialize tzname[0] to "ERA", with an explanation in the * manual page of what this "time zone abbreviation" means (doing this so * that tzname[0] has the "normal" length of three characters). */ #define WILDABBR " " #endif /* !defined WILDABBR */ static char wildabbr[] = "WILDABBR"; #endif /* TM_ZONE */ /*! \brief FreeBSD defines 'zone' in 'struct tm' as non-const, so don't declare this string as const. */ static char gmt[] = "GMT"; /*!< \brief time type information */ struct ttinfo { long tt_gmtoff; /*!< GMT offset in seconds */ int tt_isdst; /*!< used to set tm_isdst */ int tt_abbrind; /*!< abbreviation list index */ int tt_ttisstd; /*!< TRUE if transition is std time */ int tt_ttisgmt; /*!< TRUE if transition is GMT */ }; /*! \brief leap second information */ struct lsinfo { time_t ls_trans; /*!< transition time */ long ls_corr; /*!< correction to apply */ }; #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) #ifdef TZNAME_MAX #define MY_TZNAME_MAX TZNAME_MAX #endif /* defined TZNAME_MAX */ #ifndef TZNAME_MAX #define MY_TZNAME_MAX 255 #endif /* !defined TZNAME_MAX */ struct state { char name[TZ_STRLEN_MAX + 1]; int leapcnt; int timecnt; int typecnt; int charcnt; time_t ats[TZ_MAX_TIMES]; unsigned char types[TZ_MAX_TIMES]; struct ttinfo ttis[TZ_MAX_TYPES]; char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), (2 * (MY_TZNAME_MAX + 1)))]; struct lsinfo lsis[TZ_MAX_LEAPS]; struct state *next; }; struct rule { int r_type; /*!< type of rule--see below */ int r_day; /*!< day number of rule */ int r_week; /*!< week number of rule */ int r_mon; /*!< month number of rule */ long r_time; /*!< transition time of rule */ }; #define JULIAN_DAY 0 /*!< Jn - Julian day */ #define DAY_OF_YEAR 1 /*!< n - day of year */ #define MONTH_NTH_DAY_OF_WEEK 2 /*!< Mm.n.d - month, week, day of week */ /* ** Prototypes for static functions. */ static long detzcode P((const char * codep)); static const char * getnum P((const char * strp, int * nump, int min, int max)); static const char * getsecs P((const char * strp, long * secsp)); static const char * getoffset P((const char * strp, long * offsetp)); static const char * getrule P((const char * strp, struct rule * rulep)); static void gmtload P((struct state * sp)); static void gmtsub P((const time_t * timep, long offset, struct tm * tmp, const char * zone)); static void localsub P((const time_t * timep, long offset, struct tm * tmp, const char * zone)); static int increment_overflow P((int * number, int delta)); static int normalize_overflow P((int * tensptr, int * unitsptr, int base)); static time_t time1 P((struct tm * tmp, void(*funcp) P((const time_t *, long, struct tm *, const char*)), long offset, const char * zone)); static time_t time2 P((struct tm *tmp, void(*funcp) P((const time_t *, long, struct tm*, const char*)), long offset, int * okayp, const char * zone)); static void timesub P((const time_t * timep, long offset, const struct state * sp, struct tm * tmp)); static int tmcomp P((const struct tm * atmp, const struct tm * btmp)); static time_t transtime P((time_t janfirst, int year, const struct rule * rulep, long offset)); static int tzload P((const char * name, struct state * sp)); static int tzparse P((const char * name, struct state * sp, int lastditch)); static struct state * lclptr = NULL; static struct state * last_lclptr = NULL; static struct state * gmtptr = NULL; #ifndef TZ_STRLEN_MAX #define TZ_STRLEN_MAX 255 #endif /* !defined TZ_STRLEN_MAX */ static int gmt_is_set; #ifdef _THREAD_SAFE AST_MUTEX_DEFINE_STATIC(lcl_mutex); AST_MUTEX_DEFINE_STATIC(tzset_mutex); AST_MUTEX_DEFINE_STATIC(tzsetwall_mutex); AST_MUTEX_DEFINE_STATIC(gmt_mutex); #endif /* ** Section 4.12.3 of X3.159-1989 requires that ** Except for the strftime function, these functions [asctime, ** ctime, gmtime, localtime] return values in one of two static ** objects: a broken-down time structure and an array of char. ** Thanks to Paul Eggert (eggert@twinsun.com) for noting this. */ static long detzcode(const char * const codep) { register long result; register int i; result = (codep[0] & 0x80) ? ~0L : 0L; for (i = 0; i < 4; ++i) result = (result << 8) | (codep[i] & 0xff); return result; } static int tzload(register const char *name, register struct state *const sp) { register const char * p; register int i; register int fid; #ifdef DEBUG fprintf(stderr,"tzload called with name=%s, sp=%d\n", name, sp); #endif if (name == NULL && (name = TZDEFAULT) == NULL) return -1; { register int doaccess; struct stat stab; /* ** Section 4.9.1 of the C standard says that ** "FILENAME_MAX expands to an integral constant expression ** that is the size needed for an array of char large enough ** to hold the longest file name string that the implementation ** guarantees can be opened." */ char fullname[FILENAME_MAX + 1] = ""; if (name[0] == ':') ++name; doaccess = name[0] == '/'; if (!doaccess) { if ((p = TZDIR) == NULL) return -1; if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname) return -1; (void) strncpy(fullname, p, sizeof(fullname) - 1); (void) strncat(fullname, "/", sizeof(fullname) - strlen(fullname) - 1); (void) strncat(fullname, name, sizeof(fullname) - strlen(fullname) - 1); /* ** Set doaccess if '.' (as in "../") shows up in name. */ if (strchr(name, '.') != NULL) doaccess = TRUE; name = fullname; } if (doaccess && access(name, R_OK) != 0) return -1; if ((fid = open(name, OPEN_MODE)) == -1) return -1; if ((fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) { close(fid); return -1; } } { struct tzhead * tzhp; char buf[sizeof *sp + sizeof *tzhp]; int ttisstdcnt; int ttisgmtcnt; i = read(fid, buf, sizeof buf); if (close(fid) != 0) return -1; p = buf; p += (sizeof tzhp->tzh_magic) + (sizeof tzhp->tzh_reserved); ttisstdcnt = (int) detzcode(p); p += 4; ttisgmtcnt = (int) detzcode(p); p += 4; sp->leapcnt = (int) detzcode(p); p += 4; sp->timecnt = (int) detzcode(p); p += 4; sp->typecnt = (int) detzcode(p); p += 4; sp->charcnt = (int) detzcode(p); p += 4; if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) return -1; if (i - (p - buf) < sp->timecnt * 4 + /* ats */ sp->timecnt + /* types */ sp->typecnt * (4 + 2) + /* ttinfos */ sp->charcnt + /* chars */ sp->leapcnt * (4 + 4) + /* lsinfos */ ttisstdcnt + /* ttisstds */ ttisgmtcnt) /* ttisgmts */ return -1; for (i = 0; i < sp->timecnt; ++i) { sp->ats[i] = detzcode(p); p += 4; } for (i = 0; i < sp->timecnt; ++i) { sp->types[i] = (unsigned char) *p++; if (sp->types[i] >= sp->typecnt) return -1; } for (i = 0; i < sp->typecnt; ++i) { register struct ttinfo * ttisp; ttisp = &sp->ttis[i]; ttisp->tt_gmtoff = detzcode(p); p += 4; ttisp->tt_isdst = (unsigned char) *p++; if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) return -1; ttisp->tt_abbrind = (unsigned char) *p++; if (ttisp->tt_abbrind < 0 || ttisp->tt_abbrind > sp->charcnt) return -1; } for (i = 0; i < sp->charcnt; ++i) sp->chars[i] = *p++; sp->chars[i] = '\0'; /* ensure '\0' at end */ for (i = 0; i < sp->leapcnt; ++i) { register struct lsinfo * lsisp; lsisp = &sp->lsis[i]; lsisp->ls_trans = detzcode(p); p += 4; lsisp->ls_corr = detzcode(p); p += 4; } for (i = 0; i < sp->typecnt; ++i) { register struct ttinfo * ttisp; ttisp = &sp->ttis[i]; if (ttisstdcnt == 0) ttisp->tt_ttisstd = FALSE; else { ttisp->tt_ttisstd = *p++; if (ttisp->tt_ttisstd != TRUE && ttisp->tt_ttisstd != FALSE) return -1; } } for (i = 0; i < sp->typecnt; ++i) { register struct ttinfo * ttisp; ttisp = &sp->ttis[i]; if (ttisgmtcnt == 0) ttisp->tt_ttisgmt = FALSE; else { ttisp->tt_ttisgmt = *p++; if (ttisp->tt_ttisgmt != TRUE && ttisp->tt_ttisgmt != FALSE) return -1; } } } return 0; } static const int mon_lengths[2][MONSPERYEAR] = { { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } }; static const int year_lengths[2] = { DAYSPERNYEAR, DAYSPERLYEAR }; /*! \brief * Given a pointer into a time zone string, extract a number from that string. * \return Check that the number is within a specified range; if it is not, return * NULL. * Otherwise, return a pointer to the first character not part of the number. */ static const char *getnum(register const char *strp, int * const nump, const int min, const int max) { register char c; register int num; if (strp == NULL || !is_digit(c = *strp)) return NULL; num = 0; do { num = num * 10 + (c - '0'); if (num > max) return NULL; /* illegal value */ c = *++strp; } while (is_digit(c)); if (num < min) return NULL; /* illegal value */ *nump = num; return strp; } /*! \brief * Given a pointer into a time zone string, extract a number of seconds, * in hh[:mm[:ss]] form, from the string. * \return If any error occurs, return NULL. * Otherwise, return a pointer to the first character not part of the number * of seconds. */ static const char *getsecs(register const char *strp, long * const secsp) { int num; /* ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like ** "M10.4.6/26", which does not conform to Posix, ** but which specifies the equivalent of ** ``02:00 on the first Sunday on or after 23 Oct''. */ strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); if (strp == NULL) return NULL; *secsp = num * (long) SECSPERHOUR; if (*strp == ':') { ++strp; strp = getnum(strp, &num, 0, MINSPERHOUR - 1); if (strp == NULL) return NULL; *secsp += num * SECSPERMIN; if (*strp == ':') { ++strp; /* `SECSPERMIN' allows for leap seconds. */ strp = getnum(strp, &num, 0, SECSPERMIN); if (strp == NULL) return NULL; *secsp += num; } } return strp; } /*! \brief * Given a pointer into a time zone string, extract an offset, in * [+-]hh[:mm[:ss]] form, from the string. * \return If any error occurs, return NULL. * Otherwise, return a pointer to the first character not part of the time. */ static const char * getoffset(register const char *strp, long * const offsetp) { register int neg = 0; if (*strp == '-') { neg = 1; ++strp; } else if (*strp == '+') ++strp; strp = getsecs(strp, offsetp); if (strp == NULL) return NULL; /* illegal time */ if (neg) *offsetp = -*offsetp; return strp; } /*! \brief * Given a pointer into a time zone string, extract a rule in the form * date[/time]. See POSIX section 8 for the format of "date" and "time". * \return If a valid rule is not found, return NULL. * Otherwise, return a pointer to the first character not part of the rule. */ static const char *getrule(const char *strp, register struct rule * const rulep) { if (*strp == 'J') { /* ** Julian day. */ rulep->r_type = JULIAN_DAY; ++strp; strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); } else if (*strp == 'M') { /* ** Month, week, day. */ rulep->r_type = MONTH_NTH_DAY_OF_WEEK; ++strp; strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); if (strp == NULL) return NULL; if (*strp++ != '.') return NULL; strp = getnum(strp, &rulep->r_week, 1, 5); if (strp == NULL) return NULL; if (*strp++ != '.') return NULL; strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); } else if (is_digit(*strp)) { /* ** Day of year. */ rulep->r_type = DAY_OF_YEAR; strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); } else return NULL; /* invalid format */ if (strp == NULL) return NULL; if (*strp == '/') { /* ** Time specified. */ ++strp; strp = getsecs(strp, &rulep->r_time); } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ return strp; } /*! \brief * Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the * year, a rule, and the offset from GMT at the time that rule takes effect, * calculate the Epoch-relative time that rule takes effect. */ static time_t transtime(janfirst, year, rulep, offset) const time_t janfirst; const int year; register const struct rule * const rulep; const long offset; { register int leapyear; register time_t value = 0; register int i; int d, m1, yy0, yy1, yy2, dow; leapyear = isleap(year); switch (rulep->r_type) { case JULIAN_DAY: /* ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap ** years. ** In non-leap years, or if the day number is 59 or less, just ** add SECSPERDAY times the day number-1 to the time of ** January 1, midnight, to get the day. */ value = janfirst + (rulep->r_day - 1) * SECSPERDAY; if (leapyear && rulep->r_day >= 60) value += SECSPERDAY; break; case DAY_OF_YEAR: /* ** n - day of year. ** Just add SECSPERDAY times the day number to the time of ** January 1, midnight, to get the day. */ value = janfirst + rulep->r_day * SECSPERDAY; break; case MONTH_NTH_DAY_OF_WEEK: /* ** Mm.n.d - nth "dth day" of month m. */ value = janfirst; for (i = 0; i < rulep->r_mon - 1; ++i) value += mon_lengths[leapyear][i] * SECSPERDAY; /* ** Use Zeller's Congruence to get day-of-week of first day of ** month. */ m1 = (rulep->r_mon + 9) % 12 + 1; yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; yy1 = yy0 / 100; yy2 = yy0 % 100; dow = ((26 * m1 - 2) / 10 + 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; if (dow < 0) dow += DAYSPERWEEK; /* ** "dow" is the day-of-week of the first day of the month. Get ** the day-of-month (zero-origin) of the first "dow" day of the ** month. */ d = rulep->r_day - dow; if (d < 0) d += DAYSPERWEEK; for (i = 1; i < rulep->r_week; ++i) { if (d + DAYSPERWEEK >= mon_lengths[leapyear][rulep->r_mon - 1]) break; d += DAYSPERWEEK; } /* ** "d" is the day-of-month (zero-origin) of the day we want. */ value += d * SECSPERDAY; break; } /* ** "value" is the Epoch-relative time of 00:00:00 GMT on the day in ** question. To get the Epoch-relative time of the specified local ** time on that day, add the transition time and the current offset ** from GMT. */ return value + rulep->r_time + offset; } /* ** Given a POSIX section 8-style TZ string, fill in the rule tables as ** appropriate. */ static int tzparse(name, sp, lastditch) const char * name; register struct state * const sp; const int lastditch; { const char * stdname; const char * dstname = NULL; size_t stdlen = 0; size_t dstlen = 0; long stdoffset = 0L; long dstoffset = 0L; register time_t * atp; register unsigned char * typep; register char * cp; register int load_result; stdname = name; #ifdef DEBUG fprintf(stderr, "tzparse(): loading default rules\n"); #endif load_result = tzload(TZDEFRULES, sp); if (load_result != 0) sp->leapcnt = 0; /* so, we're off a little */ if (*name != '\0') { if (*name != '\0' && *name != ',' && *name != ';') { name = getoffset(name, &dstoffset); if (name == NULL) return -1; } else dstoffset = stdoffset - SECSPERHOUR; if (*name == ',' || *name == ';') { struct rule start; struct rule end; register int year; register time_t janfirst; time_t starttime; time_t endtime; ++name; if ((name = getrule(name, &start)) == NULL) return -1; if (*name++ != ',') return -1; if ((name = getrule(name, &end)) == NULL) return -1; if (*name != '\0') return -1; sp->typecnt = 2; /* standard time and DST */ /* ** Two transitions per year, from EPOCH_YEAR to 2037. */ sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); if (sp->timecnt > TZ_MAX_TIMES) return -1; sp->ttis[0].tt_gmtoff = -dstoffset; sp->ttis[0].tt_isdst = 1; sp->ttis[0].tt_abbrind = stdlen + 1; sp->ttis[1].tt_gmtoff = -stdoffset; sp->ttis[1].tt_isdst = 0; sp->ttis[1].tt_abbrind = 0; atp = sp->ats; typep = sp->types; janfirst = 0; for (year = EPOCH_YEAR; year <= 2037; ++year) { starttime = transtime(janfirst, year, &start, stdoffset); endtime = transtime(janfirst, year, &end, dstoffset); if (starttime > endtime) { *atp++ = endtime; *typep++ = 1; /* DST ends */ *atp++ = starttime; *typep++ = 0; /* DST begins */ } else { *atp++ = starttime; *typep++ = 0; /* DST begins */ *atp++ = endtime; *typep++ = 1; /* DST ends */ } janfirst += year_lengths[isleap(year)] * SECSPERDAY; } } else { register long theirstdoffset; register long theirdstoffset; register long theiroffset; register int isdst; register int i; register int j; if (*name != '\0') return -1; if (load_result != 0) return -1; /* ** Initial values of theirstdoffset and theirdstoffset. */ theirstdoffset = 0; for (i = 0; i < sp->timecnt; ++i) { j = sp->types[i]; if (!sp->ttis[j].tt_isdst) { theirstdoffset = -sp->ttis[j].tt_gmtoff; break; } } theirdstoffset = 0; for (i = 0; i < sp->timecnt; ++i) { j = sp->types[i]; if (sp->ttis[j].tt_isdst) { theirdstoffset = -sp->ttis[j].tt_gmtoff; break; } } /* ** Initially we're assumed to be in standard time. */ isdst = FALSE; theiroffset = theirstdoffset; /* ** Now juggle transition times and types ** tracking offsets as you do. */ for (i = 0; i < sp->timecnt; ++i) { j = sp->types[i]; sp->types[i] = sp->ttis[j].tt_isdst; if (sp->ttis[j].tt_ttisgmt) { /* No adjustment to transition time */ } else { /* ** If summer time is in effect, and the ** transition time was not specified as ** standard time, add the summer time ** offset to the transition time; ** otherwise, add the standard time ** offset to the transition time. */ /* ** Transitions from DST to DDST ** will effectively disappear since ** POSIX provides for only one DST ** offset. */ if (isdst && !sp->ttis[j].tt_ttisstd) { sp->ats[i] += dstoffset - theirdstoffset; } else { sp->ats[i] += stdoffset - theirstdoffset; } } theiroffset = -sp->ttis[j].tt_gmtoff; if (sp->ttis[j].tt_isdst) theirdstoffset = theiroffset; else theirstdoffset = theiroffset; } /* ** Finally, fill in ttis. ** ttisstd and ttisgmt need not be handled. */ sp->ttis[0].tt_gmtoff = -stdoffset; sp->ttis[0].tt_isdst = FALSE; sp->ttis[0].tt_abbrind = 0; sp->ttis[1].tt_gmtoff = -dstoffset; sp->ttis[1].tt_isdst = TRUE; sp->ttis[1].tt_abbrind = stdlen + 1; } } else { dstlen = 0; sp->typecnt = 1; /* only standard time */ sp->timecnt = 0; sp->ttis[0].tt_gmtoff = -stdoffset; sp->ttis[0].tt_isdst = 0; sp->ttis[0].tt_abbrind = 0; } sp->charcnt = stdlen + 1; if (dstlen != 0) sp->charcnt += dstlen + 1; if (sp->charcnt > sizeof sp->chars) return -1; cp = sp->chars; (void) strncpy(cp, stdname, stdlen); cp += stdlen; *cp++ = '\0'; if (dstlen != 0) { (void) strncpy(cp, dstname, dstlen); *(cp + dstlen) = '\0'; } return 0; } static void gmtload(sp) struct state * const sp; { if (tzload(gmt, sp) != 0) (void) tzparse(gmt, sp, TRUE); } /* ** A non-static declaration of ast_tzsetwall in a system header file ** may cause a warning about this upcoming static declaration... */ static #ifdef _THREAD_SAFE int ast_tzsetwall_basic P((void)) #else int ast_tzsetwall P((void)) #endif { struct state *cur_state = lclptr; /* Find the appropriate structure, if already parsed */ while (cur_state != NULL) { if (cur_state->name[0] == '\0') break; cur_state = cur_state->next; } if (cur_state != NULL) return 0; cur_state = malloc(sizeof(struct state)); if (cur_state == NULL) { return -1; } memset(cur_state,0,sizeof(struct state)); if (tzload((char *) NULL, cur_state) != 0) #ifdef DEBUG { fprintf(stderr, "ast_tzsetwall: calling gmtload()\n"); #endif gmtload(cur_state); #ifdef DEBUG } #endif if (last_lclptr) last_lclptr->next = cur_state; else lclptr = cur_state; last_lclptr = cur_state; return 0; } #ifdef _THREAD_SAFE int ast_tzsetwall P((void)) { ast_mutex_lock(&tzsetwall_mutex); ast_tzsetwall_basic(); ast_mutex_unlock(&tzsetwall_mutex); return 0; } #endif #ifdef _THREAD_SAFE static int ast_tzset_basic P((const char *name)) #else int ast_tzset P((const char *name)) #endif { struct state *cur_state = lclptr; /* Not set at all */ if (name == NULL) { return ast_tzsetwall(); } /* Find the appropriate structure, if already parsed */ while (cur_state != NULL) { if (!strcmp(cur_state->name,name)) break; cur_state = cur_state->next; } if (cur_state != NULL) return 0; cur_state = malloc(sizeof(struct state)); if (cur_state == NULL) { return -1; } memset(cur_state,0,sizeof(*cur_state)); /* Name is set, but set to the empty string == no adjustments */ if (name[0] == '\0') { /* ** User wants it fast rather than right. */ cur_state->leapcnt = 0; /* so, we're off a little */ cur_state->timecnt = 0; cur_state->ttis[0].tt_gmtoff = 0; cur_state->ttis[0].tt_abbrind = 0; (void) strncpy(cur_state->chars, gmt, sizeof(cur_state->chars) - 1); } else if (tzload(name, cur_state) != 0) { if (name[0] == ':') { (void) gmtload(cur_state); } else if (tzparse(name, cur_state, FALSE) != 0) { /* If not found, load localtime */ if (tzload("/etc/localtime", cur_state) != 0) /* Last ditch, get GMT */ (void) gmtload(cur_state); } } strncpy(cur_state->name, name, sizeof(cur_state->name) - 1); if (last_lclptr) last_lclptr->next = cur_state; else lclptr = cur_state; last_lclptr = cur_state; return 0; } #ifdef _THREAD_SAFE void ast_tzset P((const char *name)) { ast_mutex_lock(&tzset_mutex); ast_tzset_basic(name); ast_mutex_unlock(&tzset_mutex); } #endif /* ** The easy way to behave "as if no library function calls" localtime ** is to not call it--so we drop its guts into "localsub", which can be ** freely called. (And no, the PANS doesn't require the above behavior-- ** but it *is* desirable.) ** ** The unused offset argument is for the benefit of mktime variants. */ /*ARGSUSED*/ static void localsub(timep, offset, tmp, zone) const time_t * const timep; const long offset; struct tm * const tmp; const char * const zone; { register struct state * sp; register const struct ttinfo * ttisp; register int i; const time_t t = *timep; sp = lclptr; /* Find the right zone record */ if (zone == NULL) sp = NULL; else while (sp != NULL) { if (!strcmp(sp->name,zone)) break; sp = sp->next; } if (sp == NULL) { ast_tzsetwall(); sp = lclptr; /* Find the default zone record */ while (sp != NULL) { if (sp->name[0] == '\0') break; sp = sp->next; } } /* Last ditch effort, use GMT */ if (sp == NULL) { gmtsub(timep, offset, tmp, zone); return; } if (sp->timecnt == 0 || t < sp->ats[0]) { i = 0; while (sp->ttis[i].tt_isdst) if (++i >= sp->typecnt) { i = 0; break; } } else { for (i = 1; i < sp->timecnt; ++i) if (t < sp->ats[i]) break; i = sp->types[i - 1]; } ttisp = &sp->ttis[i]; /* ** To get (wrong) behavior that's compatible with System V Release 2.0 ** you'd replace the statement below with ** t += ttisp->tt_gmtoff; ** timesub(&t, 0L, sp, tmp); */ timesub(&t, ttisp->tt_gmtoff, sp, tmp); tmp->tm_isdst = ttisp->tt_isdst; tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; #ifdef TM_ZONE tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; #endif /* defined TM_ZONE */ } struct tm * ast_localtime(timep, p_tm, zone) const time_t * const timep; struct tm *p_tm; const char * const zone; { #ifdef _THREAD_SAFE ast_mutex_lock(&lcl_mutex); #endif ast_tzset(ast_strlen_zero(zone) ? "/etc/localtime" : zone); localsub(timep, 0L, p_tm, zone); #ifdef _THREAD_SAFE ast_mutex_unlock(&lcl_mutex); #endif return(p_tm); } /* ** gmtsub is to gmtime as localsub is to localtime. */ static void gmtsub(timep, offset, tmp, zone) const time_t * const timep; const long offset; struct tm * const tmp; const char * const zone; { #ifdef _THREAD_SAFE ast_mutex_lock(&gmt_mutex); #endif if (!gmt_is_set) { gmt_is_set = TRUE; gmtptr = (struct state *) malloc(sizeof *gmtptr); if (gmtptr != NULL) gmtload(gmtptr); } ast_mutex_unlock(&gmt_mutex); timesub(timep, offset, gmtptr, tmp); #ifdef TM_ZONE /* ** Could get fancy here and deliver something such as ** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero, ** but this is no time for a treasure hunt. */ if (offset != 0) tmp->TM_ZONE = wildabbr; else { if (gmtptr == NULL) tmp->TM_ZONE = gmt; else tmp->TM_ZONE = gmtptr->chars; } #endif /* defined TM_ZONE */ } static void timesub(timep, offset, sp, tmp) const time_t * const timep; const long offset; register const struct state * const sp; register struct tm * const tmp; { register const struct lsinfo * lp; register long days; register long rem; register int y; register int yleap; register const int * ip; register long corr; register int hit; register int i; corr = 0; hit = 0; i = (sp == NULL) ? 0 : sp->leapcnt; while (--i >= 0) { lp = &sp->lsis[i]; if (*timep >= lp->ls_trans) { if (*timep == lp->ls_trans) { hit = ((i == 0 && lp->ls_corr > 0) || lp->ls_corr > sp->lsis[i - 1].ls_corr); if (hit) while (i > 0 && sp->lsis[i].ls_trans == sp->lsis[i - 1].ls_trans + 1 && sp->lsis[i].ls_corr == sp->lsis[i - 1].ls_corr + 1) { ++hit; --i; } } corr = lp->ls_corr; break; } } days = *timep / SECSPERDAY; rem = *timep % SECSPERDAY; #ifdef mc68k if (*timep == 0x80000000) { /* ** A 3B1 muffs the division on the most negative number. */ days = -24855; rem = -11648; } #endif /* defined mc68k */ rem += (offset - corr); while (rem < 0) { rem += SECSPERDAY; --days; } while (rem >= SECSPERDAY) { rem -= SECSPERDAY; ++days; } tmp->tm_hour = (int) (rem / SECSPERHOUR); rem = rem % SECSPERHOUR; tmp->tm_min = (int) (rem / SECSPERMIN); /* ** A positive leap second requires a special ** representation. This uses "... ??:59:60" et seq. */ tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); if (tmp->tm_wday < 0) tmp->tm_wday += DAYSPERWEEK; y = EPOCH_YEAR; #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400) while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { register int newy; newy = y + days / DAYSPERNYEAR; if (days < 0) --newy; days -= (newy - y) * DAYSPERNYEAR + LEAPS_THRU_END_OF(newy - 1) - LEAPS_THRU_END_OF(y - 1); y = newy; } tmp->tm_year = y - TM_YEAR_BASE; tmp->tm_yday = (int) days; ip = mon_lengths[yleap]; for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) days = days - (long) ip[tmp->tm_mon]; tmp->tm_mday = (int) (days + 1); tmp->tm_isdst = 0; #ifdef TM_GMTOFF tmp->TM_GMTOFF = offset; #endif /* defined TM_GMTOFF */ } char * ast_ctime(timep) const time_t * const timep; { /* ** Section 4.12.3.2 of X3.159-1989 requires that ** The ctime funciton converts the calendar time pointed to by timer ** to local time in the form of a string. It is equivalent to ** asctime(localtime(timer)) */ return asctime(localtime(timep)); } char * ast_ctime_r(timep, buf) const time_t * const timep; char *buf; { struct tm tm; #ifdef SOLARIS return asctime_r(localtime_r(timep, &tm), buf, 256); #else return asctime_r(localtime_r(timep, &tm), buf); #endif } /* ** Adapted from code provided by Robert Elz, who writes: ** The "best" way to do mktime I think is based on an idea of Bob ** Kridle's (so its said...) from a long time ago. ** [kridle@xinet.com as of 1996-01-16.] ** It does a binary search of the time_t space. Since time_t's are ** just 32 bits, its a max of 32 iterations (even at 64 bits it ** would still be very reasonable). */ #ifndef WRONG #define WRONG (-1) #endif /* !defined WRONG */ /* ** Simplified normalize logic courtesy Paul Eggert (eggert@twinsun.com). */ static int increment_overflow(number, delta) int * number; int delta; { int number0; number0 = *number; *number += delta; return (*number < number0) != (delta < 0); } static int normalize_overflow(tensptr, unitsptr, base) int * const tensptr; int * const unitsptr; const int base; { register int tensdelta; tensdelta = (*unitsptr >= 0) ? (*unitsptr / base) : (-1 - (-1 - *unitsptr) / base); *unitsptr -= tensdelta * base; return increment_overflow(tensptr, tensdelta); } static int tmcomp(atmp, btmp) register const struct tm * const atmp; register const struct tm * const btmp; { register int result; if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && (result = (atmp->tm_min - btmp->tm_min)) == 0) result = atmp->tm_sec - btmp->tm_sec; return result; } static time_t time2(tmp, funcp, offset, okayp, zone) struct tm * const tmp; void (* const funcp) P((const time_t*, long, struct tm*, const char*)); const long offset; int * const okayp; const char * const zone; { register const struct state * sp; register int dir; register int bits; register int i, j ; register int saved_seconds; time_t newt; time_t t; struct tm yourtm, mytm; *okayp = FALSE; yourtm = *tmp; if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) return WRONG; if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) return WRONG; if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) return WRONG; /* ** Turn yourtm.tm_year into an actual year number for now. ** It is converted back to an offset from TM_YEAR_BASE later. */ if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) return WRONG; while (yourtm.tm_mday <= 0) { if (increment_overflow(&yourtm.tm_year, -1)) return WRONG; i = yourtm.tm_year + (1 < yourtm.tm_mon); yourtm.tm_mday += year_lengths[isleap(i)]; } while (yourtm.tm_mday > DAYSPERLYEAR) { i = yourtm.tm_year + (1 < yourtm.tm_mon); yourtm.tm_mday -= year_lengths[isleap(i)]; if (increment_overflow(&yourtm.tm_year, 1)) return WRONG; } for ( ; ; ) { i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; if (yourtm.tm_mday <= i) break; yourtm.tm_mday -= i; if (++yourtm.tm_mon >= MONSPERYEAR) { yourtm.tm_mon = 0; if (increment_overflow(&yourtm.tm_year, 1)) return WRONG; } } if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) return WRONG; if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { /* ** We can't set tm_sec to 0, because that might push the ** time below the minimum representable time. ** Set tm_sec to 59 instead. ** This assumes that the minimum representable time is ** not in the same minute that a leap second was deleted from, ** which is a safer assumption than using 58 would be. */ if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) return WRONG; saved_seconds = yourtm.tm_sec; yourtm.tm_sec = SECSPERMIN - 1; } else { saved_seconds = yourtm.tm_sec; yourtm.tm_sec = 0; } /* ** Divide the search space in half ** (this works whether time_t is signed or unsigned). */ bits = TYPE_BIT(time_t) - 1; /* ** If time_t is signed, then 0 is just above the median, ** assuming two's complement arithmetic. ** If time_t is unsigned, then (1 << bits) is just above the median. */ t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits); for ( ; ; ) { (*funcp)(&t, offset, &mytm, zone); dir = tmcomp(&mytm, &yourtm); if (dir != 0) { if (bits-- < 0) return WRONG; if (bits < 0) --t; /* may be needed if new t is minimal */ else if (dir > 0) t -= ((time_t) 1) << bits; else t += ((time_t) 1) << bits; continue; } if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) break; /* ** Right time, wrong type. ** Hunt for right time, right type. ** It's okay to guess wrong since the guess ** gets checked. */ /* ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. */ sp = (const struct state *) (((void *) funcp == (void *) localsub) ? lclptr : gmtptr); if (sp == NULL) return WRONG; for (i = sp->typecnt - 1; i >= 0; --i) { if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) continue; for (j = sp->typecnt - 1; j >= 0; --j) { if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) continue; newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; (*funcp)(&newt, offset, &mytm, zone); if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) continue; /* ** We have a match. */ t = newt; goto label; } } return WRONG; } label: newt = t + saved_seconds; if ((newt < t) != (saved_seconds < 0)) return WRONG; t = newt; (*funcp)(&t, offset, tmp, zone); *okayp = TRUE; return t; } static time_t time1(tmp, funcp, offset, zone) struct tm * const tmp; void (* const funcp) P((const time_t *, long, struct tm *, const char*)); const long offset; const char * const zone; { register time_t t; register const struct state * sp; register int samei, otheri; int okay; if (tmp->tm_isdst > 1) tmp->tm_isdst = 1; t = time2(tmp, funcp, offset, &okay, zone); #ifdef PCTS /* ** PCTS code courtesy Grant Sullivan (grant@osf.org). */ if (okay) return t; if (tmp->tm_isdst < 0) tmp->tm_isdst = 0; /* reset to std and try again */ #endif /* defined PCTS */ #ifndef PCTS if (okay || tmp->tm_isdst < 0) return t; #endif /* !defined PCTS */ /* ** We're supposed to assume that somebody took a time of one type ** and did some math on it that yielded a "struct tm" that's bad. ** We try to divine the type they started from and adjust to the ** type they need. */ /* ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. */ sp = (const struct state *) (((void *) funcp == (void *) localsub) ? lclptr : gmtptr); if (sp == NULL) return WRONG; for (samei = sp->typecnt - 1; samei >= 0; --samei) { if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) continue; for (otheri = sp->typecnt - 1; otheri >= 0; --otheri) { if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) continue; tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - sp->ttis[samei].tt_gmtoff; tmp->tm_isdst = !tmp->tm_isdst; t = time2(tmp, funcp, offset, &okay, zone); if (okay) return t; tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - sp->ttis[samei].tt_gmtoff; tmp->tm_isdst = !tmp->tm_isdst; } } return WRONG; } time_t ast_mktime(tmp,zone) struct tm * const tmp; const char * const zone; { time_t mktime_return_value; #ifdef _THREAD_SAFE ast_mutex_lock(&lcl_mutex); #endif ast_tzset(!ast_strlen_zero(zone) ? zone : "/etc/localtime"); mktime_return_value = time1(tmp, localsub, 0L, !ast_strlen_zero(zone) ? zone : "/etc/localtime"); #ifdef _THREAD_SAFE ast_mutex_unlock(&lcl_mutex); #endif return(mktime_return_value); }