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Diffstat (limited to 'trunk/main/stdtime/localtime.c')
| -rw-r--r-- | trunk/main/stdtime/localtime.c | 1820 |
1 files changed, 0 insertions, 1820 deletions
diff --git a/trunk/main/stdtime/localtime.c b/trunk/main/stdtime/localtime.c deleted file mode 100644 index 2d60beefd..000000000 --- a/trunk/main/stdtime/localtime.c +++ /dev/null @@ -1,1820 +0,0 @@ -/* - * Asterisk -- An open source telephony toolkit. - * - * Copyright (C) 1999 - 2005, Digium, Inc. - * - * Mark Spencer <markster@digium.com> - * - * 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, <tlesher@vcch.com>, 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 - * - * The original source from this file may be obtained from ftp://elsie.nci.nih.gov/pub/ - */ - -/* -** This file is in the public domain, so clarified as of -** 1996-06-05 by Arthur David Olson. -*/ - -/* -** Leap second handling from Bradley White. -** POSIX-style TZ environment variable handling from Guy Harris. -*/ - -/* #define DEBUG */ - -/*LINTLIBRARY*/ - - -#include "asterisk.h" - -ASTERISK_FILE_VERSION(__FILE__, "$Revision$") - -#include <sys/stat.h> -#include <fcntl.h> -#include <float.h> - -#include "private.h" -#include "tzfile.h" - -#include "asterisk/lock.h" -#include "asterisk/localtime.h" -#include "asterisk/strings.h" -#include "asterisk/linkedlists.h" -#include "asterisk/utils.h" - -#ifndef lint -#ifndef NOID -static char __attribute__((unused)) elsieid[] = "@(#)localtime.c 8.5"; -#endif /* !defined NOID */ -#endif /* !defined lint */ - -#ifndef TZ_ABBR_MAX_LEN -#define TZ_ABBR_MAX_LEN 16 -#endif /* !defined TZ_ABBR_MAX_LEN */ - -#ifndef TZ_ABBR_CHAR_SET -#define TZ_ABBR_CHAR_SET \ - "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" -#endif /* !defined TZ_ABBR_CHAR_SET */ - -#ifndef TZ_ABBR_ERR_CHAR -#define TZ_ABBR_ERR_CHAR '_' -#endif /* !defined TZ_ABBR_ERR_CHAR */ - -/* -** 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 */ - -static const char gmt[] = "GMT"; -static const struct timeval WRONG = { 0, 0 }; - -/*! \note - * The DST rules to use if TZ has no rules and we can't load TZDEFRULES. - * We default to US rules as of 1999-08-17. - * POSIX 1003.1 section 8.1.1 says that the default DST rules are - * implementation dependent; for historical reasons, US rules are a - * common default. - */ -#ifndef TZDEFRULESTRING -#define TZDEFRULESTRING ",M4.1.0,M10.5.0" -#endif /* !defined TZDEFDST */ - -/*!< \brief time type information */ -struct ttinfo { /* time type information */ - long tt_gmtoff; /* UTC 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 UTC */ -}; - -/*! \brief leap second information */ -struct lsinfo { /* leap second information */ - 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 */ -#ifndef TZ_STRLEN_MAX -#define TZ_STRLEN_MAX 255 -#endif /* !defined TZ_STRLEN_MAX */ - -struct state { - /*! Name of the file that this references */ - char name[TZ_STRLEN_MAX + 1]; - int leapcnt; - int timecnt; - int typecnt; - int charcnt; - int goback; - int goahead; - 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]; - AST_LIST_ENTRY(state) list; -}; - -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 time_t detzcode64 P((const char * codep)); -static int differ_by_repeat P((time_t t1, time_t t0)); -static const char * getzname P((const char * strp)); -static const char * getqzname P((const char * strp, const int delim)); -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 int gmtload P((struct state * sp)); -static struct ast_tm * gmtsub P((const struct timeval * timep, long offset, - struct ast_tm * tmp)); -static struct ast_tm * localsub P((const struct timeval * timep, long offset, - struct ast_tm * tmp, const struct state *sp)); -static int increment_overflow P((int * number, int delta)); -static int leaps_thru_end_of P((int y)); -static int long_increment_overflow P((long * number, int delta)); -static int long_normalize_overflow P((long * tensptr, - int * unitsptr, const int base)); -static int normalize_overflow P((int * tensptr, int * unitsptr, - const int base)); -static struct timeval time1 P((struct ast_tm * tmp, - struct ast_tm * (*funcp) P((const struct timeval *, - long, struct ast_tm *, const struct state *sp)), - long offset, const struct state *sp)); -static struct timeval time2 P((struct ast_tm *tmp, - struct ast_tm * (*funcp) P((const struct timeval *, - long, struct ast_tm*, const struct state *sp)), - long offset, int * okayp, const struct state *sp)); -static struct timeval time2sub P((struct ast_tm *tmp, - struct ast_tm * (*funcp) (const struct timeval *, - long, struct ast_tm*, const struct state *sp), - long offset, int * okayp, int do_norm_secs, const struct state *sp)); -static struct ast_tm * timesub P((const struct timeval * timep, long offset, - const struct state * sp, struct ast_tm * tmp)); -static int tmcomp P((const struct ast_tm * atmp, - const struct ast_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, - int doextend)); -static int tzparse P((const char * name, struct state * sp, - int lastditch)); - -static AST_LIST_HEAD_STATIC(zonelist, state); - -#ifndef TZ_STRLEN_MAX -#define TZ_STRLEN_MAX 255 -#endif /* !defined TZ_STRLEN_MAX */ - -/*! \note -** 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 for noting this. -*/ - -static long detzcode(const char * const codep) -{ - long result; - int i; - - result = (codep[0] & 0x80) ? ~0L : 0; - for (i = 0; i < 4; ++i) - result = (result << 8) | (codep[i] & 0xff); - return result; -} - -static time_t detzcode64(const char * const codep) -{ - time_t result; - int i; - - result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0; - for (i = 0; i < 8; ++i) - result = result * 256 + (codep[i] & 0xff); - return result; -} - -static int differ_by_repeat(const time_t t1, const time_t t0) -{ - const long long at1 = t1, at0 = t0; - if (TYPE_INTEGRAL(time_t) && - TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) - return 0; - return at1 - at0 == SECSPERREPEAT; -} - -static int tzload(const char *name, struct state * const sp, const int doextend) -{ - const char * p; - int i; - int fid; - int stored; - int nread; - union { - struct tzhead tzhead; - char buf[2 * sizeof(struct tzhead) + - 2 * sizeof *sp + - 4 * TZ_MAX_TIMES]; - } u; - - if (name == NULL && (name = TZDEFAULT) == NULL) - return -1; - { - int doaccess; - /* - ** 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) + strlen(name) + 1) >= sizeof fullname) - return -1; - (void) strcpy(fullname, p); - (void) strcat(fullname, "/"); - (void) strcat(fullname, name); - /* - ** 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; - } - nread = read(fid, u.buf, sizeof u.buf); - if (close(fid) < 0 || nread <= 0) - return -1; - for (stored = 4; stored <= 8; stored *= 2) { - int ttisstdcnt; - int ttisgmtcnt; - - ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); - ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); - sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt); - sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt); - sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt); - sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt); - p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt; - 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 (nread - (p - u.buf) < - sp->timecnt * stored + /* ats */ - sp->timecnt + /* types */ - sp->typecnt * 6 + /* ttinfos */ - sp->charcnt + /* chars */ - sp->leapcnt * (stored + 4) + /* lsinfos */ - ttisstdcnt + /* ttisstds */ - ttisgmtcnt) /* ttisgmts */ - return -1; - for (i = 0; i < sp->timecnt; ++i) { - sp->ats[i] = (stored == 4) ? - detzcode(p) : detzcode64(p); - p += stored; - } - 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) { - 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) { - struct lsinfo * lsisp; - - lsisp = &sp->lsis[i]; - lsisp->ls_trans = (stored == 4) ? - detzcode(p) : detzcode64(p); - p += stored; - lsisp->ls_corr = detzcode(p); - p += 4; - } - for (i = 0; i < sp->typecnt; ++i) { - 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) { - 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; - } - } - /* - ** Out-of-sort ats should mean we're running on a - ** signed time_t system but using a data file with - ** unsigned values (or vice versa). - */ - for (i = 0; i < sp->timecnt - 2; ++i) - if (sp->ats[i] > sp->ats[i + 1]) { - ++i; - if (TYPE_SIGNED(time_t)) { - /* - ** Ignore the end (easy). - */ - sp->timecnt = i; - } else { - /* - ** Ignore the beginning (harder). - */ - int j; - - for (j = 0; j + i < sp->timecnt; ++j) { - sp->ats[j] = sp->ats[j + i]; - sp->types[j] = sp->types[j + i]; - } - sp->timecnt = j; - } - break; - } - /* - ** If this is an old file, we're done. - */ - if (u.tzhead.tzh_version[0] == '\0') - break; - nread -= p - u.buf; - for (i = 0; i < nread; ++i) - u.buf[i] = p[i]; - /* - ** If this is a narrow integer time_t system, we're done. - */ - if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t)) - break; - } - if (doextend && nread > 2 && - u.buf[0] == '\n' && u.buf[nread - 1] == '\n' && - sp->typecnt + 2 <= TZ_MAX_TYPES) { - struct state ts; - int result; - - u.buf[nread - 1] = '\0'; - result = tzparse(&u.buf[1], &ts, FALSE); - if (result == 0 && ts.typecnt == 2 && - sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { - for (i = 0; i < 2; ++i) - ts.ttis[i].tt_abbrind += - sp->charcnt; - for (i = 0; i < ts.charcnt; ++i) - sp->chars[sp->charcnt++] = - ts.chars[i]; - i = 0; - while (i < ts.timecnt && - ts.ats[i] <= - sp->ats[sp->timecnt - 1]) - ++i; - while (i < ts.timecnt && - sp->timecnt < TZ_MAX_TIMES) { - sp->ats[sp->timecnt] = - ts.ats[i]; - sp->types[sp->timecnt] = - sp->typecnt + - ts.types[i]; - ++sp->timecnt; - ++i; - } - sp->ttis[sp->typecnt++] = ts.ttis[0]; - sp->ttis[sp->typecnt++] = ts.ttis[1]; - } - } - i = 2 * YEARSPERREPEAT; - sp->goback = sp->goahead = sp->timecnt > i; - sp->goback = sp->goback && sp->types[i] == sp->types[0] && - differ_by_repeat(sp->ats[i], sp->ats[0]); - sp->goahead = sp->goahead && - sp->types[sp->timecnt - 1] == sp->types[sp->timecnt - 1 - i] && - differ_by_repeat(sp->ats[sp->timecnt - 1], - sp->ats[sp->timecnt - 1 - i]); - 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, scan until a character that is not -** a valid character in a zone name is found. Return a pointer to that -** character. -*/ - -static const char * getzname(const char *strp) -{ - char c; - - while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && - c != '+') - ++strp; - return strp; -} - -/*! \brief -** Given a pointer into an extended time zone string, scan until the ending -** delimiter of the zone name is located. Return a pointer to the delimiter. -** -** As with getzname above, the legal character set is actually quite -** restricted, with other characters producing undefined results. -** We don't do any checking here; checking is done later in common-case code. -*/ - -static const char * getqzname(const char *strp, const int delim) -{ - int c; - - while ((c = *strp) != '\0' && c != delim) - ++strp; - return strp; -} - -/*! \brief -** Given a pointer into a time zone string, extract a number from that string. -** 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(const char *strp, int *nump, const int min, const int max) -{ - char c; - 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. -** 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(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. -** If any error occurs, return NULL. -** Otherwise, return a pointer to the first character not part of the time. -*/ - -static const char *getoffset(const char *strp, long *offsetp) -{ - 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". -** 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, struct rule *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 UTC, in a year, the -** year, a rule, and the offset from UTC at the time that rule takes effect, -** calculate the Epoch-relative time that rule takes effect. -*/ - -static time_t transtime(const time_t janfirst, const int year, const struct rule *rulep, const long offset) -{ - int leapyear; - time_t value; - int i; - int d, m1, yy0, yy1, yy2, dow; - - INITIALIZE(value); - 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 UTC 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 UTC. - */ - return value + rulep->r_time + offset; -} - -/*! \note -** Given a POSIX section 8-style TZ string, fill in the rule tables as -** appropriate. -*/ - -static int tzparse(const char *name, struct state *sp, const int lastditch) -{ - const char * stdname; - const char * dstname; - size_t stdlen; - size_t dstlen; - long stdoffset; - long dstoffset; - time_t * atp; - unsigned char * typep; - char * cp; - int load_result; - - INITIALIZE(dstname); - stdname = name; - if (lastditch) { - stdlen = strlen(name); /* length of standard zone name */ - name += stdlen; - if (stdlen >= sizeof sp->chars) - stdlen = (sizeof sp->chars) - 1; - stdoffset = 0; - } else { - if (*name == '<') { - name++; - stdname = name; - name = getqzname(name, '>'); - if (*name != '>') - return -1; - stdlen = name - stdname; - name++; - } else { - name = getzname(name); - stdlen = name - stdname; - } - if (*name == '\0') - return -1; - name = getoffset(name, &stdoffset); - if (name == NULL) - return -1; - } - load_result = tzload(TZDEFRULES, sp, FALSE); - if (load_result != 0) - sp->leapcnt = 0; /* so, we're off a little */ - if (*name != '\0') { - if (*name == '<') { - dstname = ++name; - name = getqzname(name, '>'); - if (*name != '>') - return -1; - dstlen = name - dstname; - name++; - } else { - dstname = name; - name = getzname(name); - dstlen = name - dstname; /* length of DST zone name */ - } - if (*name != '\0' && *name != ',' && *name != ';') { - name = getoffset(name, &dstoffset); - if (name == NULL) - return -1; - } else dstoffset = stdoffset - SECSPERHOUR; - if (*name == '\0' && load_result != 0) - name = TZDEFRULESTRING; - if (*name == ',' || *name == ';') { - struct rule start; - struct rule end; - int year; - 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 forward. - */ - 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; - sp->timecnt = 0; - for (year = EPOCH_YEAR; - sp->timecnt + 2 <= TZ_MAX_TIMES; - ++year) { - time_t newfirst; - - 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 */ - } - sp->timecnt += 2; - newfirst = janfirst; - newfirst += year_lengths[isleap(year)] * - SECSPERDAY; - if (newfirst <= janfirst) - break; - janfirst = newfirst; - } - } else { - long theirstdoffset; - long theirdstoffset; - long theiroffset; - int isdst; - int i; - int j; - - if (*name != '\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; - sp->typecnt = 2; - } - } 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 ((size_t) 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 int gmtload(struct state *sp) -{ - if (tzload(gmt, sp, TRUE) != 0) - return tzparse(gmt, sp, TRUE); - else - return -1; -} - -static const struct state *ast_tzset(const char *zone) -{ - struct state *sp; - - if (ast_strlen_zero(zone)) - zone = "/etc/localtime"; - - AST_LIST_LOCK(&zonelist); - AST_LIST_TRAVERSE(&zonelist, sp, list) { - if (!strcmp(sp->name, zone)) { - AST_LIST_UNLOCK(&zonelist); - return sp; - } - } - AST_LIST_UNLOCK(&zonelist); - - if (!(sp = ast_calloc(1, sizeof *sp))) - return NULL; - - if (tzload(zone, sp, TRUE) != 0) { - if (zone[0] == ':' || tzparse(zone, sp, FALSE) != 0) - (void) gmtload(sp); - } - ast_copy_string(sp->name, zone, sizeof(sp->name)); - AST_LIST_LOCK(&zonelist); - AST_LIST_INSERT_TAIL(&zonelist, sp, list); - AST_LIST_UNLOCK(&zonelist); - return sp; -} - -/*! \note -** 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. -*/ - -static struct ast_tm *localsub(const struct timeval *timep, const long offset, struct ast_tm *tmp, const struct state *sp) -{ - const struct ttinfo * ttisp; - int i; - struct ast_tm * result; - struct timeval t; - memcpy(&t, timep, sizeof(t)); - - if (sp == NULL) - return gmtsub(timep, offset, tmp); - if ((sp->goback && t.tv_sec < sp->ats[0]) || - (sp->goahead && t.tv_sec > sp->ats[sp->timecnt - 1])) { - struct timeval newt = t; - time_t seconds; - time_t tcycles; - int_fast64_t icycles; - - if (t.tv_sec < sp->ats[0]) - seconds = sp->ats[0] - t.tv_sec; - else seconds = t.tv_sec - sp->ats[sp->timecnt - 1]; - --seconds; - tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR; - ++tcycles; - icycles = tcycles; - if (tcycles - icycles >= 1 || icycles - tcycles >= 1) - return NULL; - seconds = icycles; - seconds *= YEARSPERREPEAT; - seconds *= AVGSECSPERYEAR; - if (t.tv_sec < sp->ats[0]) - newt.tv_sec += seconds; - else newt.tv_sec -= seconds; - if (newt.tv_sec < sp->ats[0] || - newt.tv_sec > sp->ats[sp->timecnt - 1]) - return NULL; /* "cannot happen" */ - result = localsub(&newt, offset, tmp, sp); - if (result == tmp) { - time_t newy; - - newy = tmp->tm_year; - if (t.tv_sec < sp->ats[0]) - newy -= icycles * YEARSPERREPEAT; - else - newy += icycles * YEARSPERREPEAT; - tmp->tm_year = newy; - if (tmp->tm_year != newy) - return NULL; - } - return result; - } - if (sp->timecnt == 0 || t.tv_sec < sp->ats[0]) { - i = 0; - while (sp->ttis[i].tt_isdst) { - if (++i >= sp->typecnt) { - i = 0; - break; - } - } - } else { - int lo = 1; - int hi = sp->timecnt; - - while (lo < hi) { - int mid = (lo + hi) >> 1; - - if (t.tv_sec < sp->ats[mid]) - hi = mid; - else - lo = mid + 1; - } - i = (int) sp->types[lo - 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); - */ - result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); - tmp->tm_isdst = ttisp->tt_isdst; - tmp->tm_gmtoff = ttisp->tt_gmtoff; -#ifdef TM_ZONE - tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; -#endif /* defined TM_ZONE */ - tmp->tm_usec = timep->tv_usec; - return result; -} - -struct ast_tm *ast_localtime(const struct timeval *timep, struct ast_tm *tmp, const char *zone) -{ - const struct state *sp = ast_tzset(zone); - memset(tmp, 0, sizeof(*tmp)); - return sp ? localsub(timep, 0L, tmp, sp) : NULL; -} - -/* -** This function provides informaton about daylight savings time -** for the given timezone. This includes whether it can determine -** if daylight savings is used for this timezone, the UTC times for -** when daylight savings transitions, and the offset in seconds from -** UTC. -*/ - -void ast_get_dst_info(const time_t * const timep, int *dst_enabled, time_t *dst_start, time_t *dst_end, int *gmt_off, const char * const zone) -{ - int i; - int transition1 = -1; - int transition2 = -1; - time_t seconds; - int bounds_exceeded = 0; - time_t t = *timep; - const struct state *sp; - - if (NULL == dst_enabled) - return; - *dst_enabled = 0; - - if (NULL == dst_start || NULL == dst_end || NULL == gmt_off) - return; - - *gmt_off = 0; - - sp = ast_tzset(zone); - if (NULL == sp) - return; - - /* If the desired time exceeds the bounds of the defined time transitions - * then give give up on determining DST info and simply look for gmt offset - * This requires that I adjust the given time using increments of Gregorian - * repeats to place the time within the defined time transitions in the - * timezone structure. - */ - if ((sp->goback && t < sp->ats[0]) || - (sp->goahead && t > sp->ats[sp->timecnt - 1])) { - time_t tcycles; - int_fast64_t icycles; - - if (t < sp->ats[0]) - seconds = sp->ats[0] - t; - else seconds = t - sp->ats[sp->timecnt - 1]; - --seconds; - tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR; - ++tcycles; - icycles = tcycles; - if (tcycles - icycles >= 1 || icycles - tcycles >= 1) - return; - seconds = icycles; - seconds *= YEARSPERREPEAT; - seconds *= AVGSECSPERYEAR; - if (t < sp->ats[0]) - t += seconds; - else - t -= seconds; - - if (t < sp->ats[0] || t > sp->ats[sp->timecnt - 1]) - return; /* "cannot happen" */ - - bounds_exceeded = 1; - } - - if (sp->timecnt == 0 || t < sp->ats[0]) { - /* I have no transition times or I'm before time */ - *dst_enabled = 0; - /* Find where I can get gmtoff */ - i = 0; - while (sp->ttis[i].tt_isdst) - if (++i >= sp->typecnt) { - i = 0; - break; - } - *gmt_off = sp->ttis[i].tt_gmtoff; - return; - } - - for (i = 1; i < sp->timecnt; ++i) { - if (t < sp->ats[i]) { - transition1 = sp->types[i - 1]; - transition2 = sp->types[i]; - break; - } - } - /* if I found transition times that do not bounded the given time and these correspond to - or the bounding zones do not reflect a changes in day light savings, then I do not have dst active */ - if (i >= sp->timecnt || 0 > transition1 || 0 > transition2 || - (sp->ttis[transition1].tt_isdst == sp->ttis[transition2].tt_isdst)) { - *dst_enabled = 0; - *gmt_off = sp->ttis[sp->types[sp->timecnt -1]].tt_gmtoff; - } else { - /* I have valid daylight savings information. */ - if(sp->ttis[transition2].tt_isdst) - *gmt_off = sp->ttis[transition1].tt_gmtoff; - else - *gmt_off = sp->ttis[transition2].tt_gmtoff; - - /* If I adjusted the time earlier, indicate that the dst is invalid */ - if (!bounds_exceeded) { - *dst_enabled = 1; - /* Determine which of the bounds is the start of daylight savings and which is the end */ - if(sp->ttis[transition2].tt_isdst) { - *dst_start = sp->ats[i]; - *dst_end = sp->ats[i -1]; - } else { - *dst_start = sp->ats[i -1]; - *dst_end = sp->ats[i]; - } - } - } - return; -} - -/* -** gmtsub is to gmtime as localsub is to localtime. -*/ - -static struct ast_tm *gmtsub(const struct timeval *timep, const long offset, struct ast_tm *tmp) -{ - struct ast_tm * result; - struct state *sp; - - AST_LIST_LOCK(&zonelist); - AST_LIST_TRAVERSE(&zonelist, sp, list) { - if (!strcmp(sp->name, "UTC")) - break; - } - - if (!sp) { - if (!(sp = (struct state *) ast_calloc(1, sizeof *sp))) - return NULL; - gmtload(sp); - AST_LIST_INSERT_TAIL(&zonelist, sp, list); - } - AST_LIST_UNLOCK(&zonelist); - - result = timesub(timep, offset, sp, tmp); -#ifdef TM_ZONE - /* - ** Could get fancy here and deliver something such as - ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, - ** but this is no time for a treasure hunt. - */ - if (offset != 0) - tmp->TM_ZONE = " "; - else - tmp->TM_ZONE = sp->chars; -#endif /* defined TM_ZONE */ - return result; -} - -/*! \brief -** Return the number of leap years through the end of the given year -** where, to make the math easy, the answer for year zero is defined as zero. -*/ - -static int leaps_thru_end_of(const int y) -{ - return (y >= 0) ? (y / 4 - y / 100 + y / 400) : - -(leaps_thru_end_of(-(y + 1)) + 1); -} - -static struct ast_tm *timesub(const struct timeval *timep, const long offset, const struct state *sp, struct ast_tm *tmp) -{ - const struct lsinfo * lp; - time_t tdays; - int idays; /* unsigned would be so 2003 */ - long rem; - int y; - const int * ip; - long corr; - int hit; - int i; - long seconds; - - - corr = 0; - hit = 0; - i = (sp == NULL) ? 0 : sp->leapcnt; - while (--i >= 0) { - lp = &sp->lsis[i]; - if (timep->tv_sec >= lp->ls_trans) { - if (timep->tv_sec == 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; - } - } - y = EPOCH_YEAR; - tdays = timep->tv_sec / SECSPERDAY; - rem = timep->tv_sec - tdays * SECSPERDAY; - while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { - int newy; - time_t tdelta; - int idelta; - int leapdays; - - tdelta = tdays / DAYSPERLYEAR; - idelta = tdelta; - if (tdelta - idelta >= 1 || idelta - tdelta >= 1) - return NULL; - if (idelta == 0) - idelta = (tdays < 0) ? -1 : 1; - newy = y; - if (increment_overflow(&newy, idelta)) - return NULL; - leapdays = leaps_thru_end_of(newy - 1) - - leaps_thru_end_of(y - 1); - tdays -= ((time_t) newy - y) * DAYSPERNYEAR; - tdays -= leapdays; - y = newy; - } - - seconds = tdays * SECSPERDAY + 0.5; - tdays = seconds / SECSPERDAY; - rem += seconds - tdays * SECSPERDAY; - - /* - ** Given the range, we can now fearlessly cast... - */ - idays = tdays; - rem += offset - corr; - while (rem < 0) { - rem += SECSPERDAY; - --idays; - } - while (rem >= SECSPERDAY) { - rem -= SECSPERDAY; - ++idays; - } - while (idays < 0) { - if (increment_overflow(&y, -1)) - return NULL; - idays += year_lengths[isleap(y)]; - } - while (idays >= year_lengths[isleap(y)]) { - idays -= year_lengths[isleap(y)]; - if (increment_overflow(&y, 1)) - return NULL; - } - tmp->tm_year = y; - if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) - return NULL; - tmp->tm_yday = idays; - /* - ** The "extra" mods below avoid overflow problems. - */ - tmp->tm_wday = EPOCH_WDAY + - ((y - EPOCH_YEAR) % DAYSPERWEEK) * - (DAYSPERNYEAR % DAYSPERWEEK) + - leaps_thru_end_of(y - 1) - - leaps_thru_end_of(EPOCH_YEAR - 1) + - idays; - tmp->tm_wday %= DAYSPERWEEK; - if (tmp->tm_wday < 0) - tmp->tm_wday += DAYSPERWEEK; - tmp->tm_hour = (int) (rem / SECSPERHOUR); - 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; - ip = mon_lengths[isleap(y)]; - for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) - idays -= ip[tmp->tm_mon]; - tmp->tm_mday = (int) (idays + 1); - tmp->tm_isdst = 0; -#ifdef TM_GMTOFF - tmp->TM_GMTOFF = offset; -#endif /* defined TM_GMTOFF */ - tmp->tm_usec = timep->tv_usec; - return tmp; -} - -/*! \note -** 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. -** 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). -*/ - -/*! \brief -** Simplified normalize logic courtesy Paul Eggert. -*/ - -static int increment_overflow(int *number, int delta) -{ - int number0; - - number0 = *number; - *number += delta; - return (*number < number0) != (delta < 0); -} - -static int long_increment_overflow(long *number, int delta) -{ - long number0; - - number0 = *number; - *number += delta; - return (*number < number0) != (delta < 0); -} - -static int normalize_overflow(int *tensptr, int *unitsptr, const int base) -{ - int tensdelta; - - tensdelta = (*unitsptr >= 0) ? - (*unitsptr / base) : - (-1 - (-1 - *unitsptr) / base); - *unitsptr -= tensdelta * base; - return increment_overflow(tensptr, tensdelta); -} - -static int long_normalize_overflow(long *tensptr, int *unitsptr, const int base) -{ - int tensdelta; - - tensdelta = (*unitsptr >= 0) ? - (*unitsptr / base) : - (-1 - (-1 - *unitsptr) / base); - *unitsptr -= tensdelta * base; - return long_increment_overflow(tensptr, tensdelta); -} - -static int tmcomp(const struct ast_tm *atmp, const struct ast_tm *btmp) -{ - 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)) == 0) - result = atmp->tm_usec - btmp->tm_usec; - return result; -} - -static struct timeval time2sub(struct ast_tm *tmp, struct ast_tm * (* const funcp) (const struct timeval *, long, struct ast_tm *, const struct state *), const long offset, int *okayp, const int do_norm_secs, const struct state *sp) -{ - int dir; - int i, j; - int saved_seconds; - long li; - time_t lo; - time_t hi; - long y; - struct timeval newt = { 0, 0 }; - struct timeval t = { 0, 0 }; - struct ast_tm yourtm, mytm; - - *okayp = FALSE; - yourtm = *tmp; - if (do_norm_secs) { - if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, - SECSPERMIN)) - return WRONG; - } - if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) - return WRONG; - if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) - return WRONG; - y = yourtm.tm_year; - if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR)) - return WRONG; - /* - ** Turn y into an actual year number for now. - ** It is converted back to an offset from TM_YEAR_BASE later. - */ - if (long_increment_overflow(&y, TM_YEAR_BASE)) - return WRONG; - while (yourtm.tm_mday <= 0) { - if (long_increment_overflow(&y, -1)) - return WRONG; - li = y + (1 < yourtm.tm_mon); - yourtm.tm_mday += year_lengths[isleap(li)]; - } - while (yourtm.tm_mday > DAYSPERLYEAR) { - li = y + (1 < yourtm.tm_mon); - yourtm.tm_mday -= year_lengths[isleap(li)]; - if (long_increment_overflow(&y, 1)) - return WRONG; - } - for ( ; ; ) { - i = mon_lengths[isleap(y)][yourtm.tm_mon]; - if (yourtm.tm_mday <= i) - break; - yourtm.tm_mday -= i; - if (++yourtm.tm_mon >= MONSPERYEAR) { - yourtm.tm_mon = 0; - if (long_increment_overflow(&y, 1)) - return WRONG; - } - } - if (long_increment_overflow(&y, -TM_YEAR_BASE)) - return WRONG; - yourtm.tm_year = y; - if (yourtm.tm_year != y) - return WRONG; - if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) - saved_seconds = 0; - else if (y + 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; - } - /* - ** Do a binary search (this works whatever time_t's type is). - */ - if (!TYPE_SIGNED(time_t)) { - lo = 0; - hi = lo - 1; - } else if (!TYPE_INTEGRAL(time_t)) { - if (sizeof(time_t) > sizeof(float)) - hi = (time_t) DBL_MAX; - else hi = (time_t) FLT_MAX; - lo = -hi; - } else { - lo = 1; - for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) - lo *= 2; - hi = -(lo + 1); - } - for ( ; ; ) { - t.tv_sec = lo / 2 + hi / 2; - if (t.tv_sec < lo) - t.tv_sec = lo; - else if (t.tv_sec > hi) - t.tv_sec = hi; - if ((*funcp)(&t, offset, &mytm, sp) == NULL) { - /* - ** Assume that t is too extreme to be represented in - ** a struct ast_tm; arrange things so that it is less - ** extreme on the next pass. - */ - dir = (t.tv_sec > 0) ? 1 : -1; - } else dir = tmcomp(&mytm, &yourtm); - if (dir != 0) { - if (t.tv_sec == lo) { - ++t.tv_sec; - if (t.tv_sec <= lo) - return WRONG; - ++lo; - } else if (t.tv_sec == hi) { - --t.tv_sec; - if (t.tv_sec >= hi) - return WRONG; - --hi; - } - if (lo > hi) - return WRONG; - if (dir > 0) - hi = t.tv_sec; - else lo = t.tv_sec; - 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. - */ - 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.tv_sec = t.tv_sec + sp->ttis[j].tt_gmtoff - - sp->ttis[i].tt_gmtoff; - if ((*funcp)(&newt, offset, &mytm, sp) == NULL) - continue; - 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.tv_sec = t.tv_sec + saved_seconds; - if ((newt.tv_sec < t.tv_sec) != (saved_seconds < 0)) - return WRONG; - t.tv_sec = newt.tv_sec; - if ((*funcp)(&t, offset, tmp, sp)) - *okayp = TRUE; - return t; -} - -static struct timeval time2(struct ast_tm *tmp, struct ast_tm * (* const funcp) (const struct timeval *, long, struct ast_tm*, const struct state *sp), const long offset, int *okayp, const struct state *sp) -{ - struct timeval t; - - /*! \note - ** First try without normalization of seconds - ** (in case tm_sec contains a value associated with a leap second). - ** If that fails, try with normalization of seconds. - */ - t = time2sub(tmp, funcp, offset, okayp, FALSE, sp); - return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE, sp); -} - -static struct timeval time1(struct ast_tm *tmp, struct ast_tm * (* const funcp) (const struct timeval *, long, struct ast_tm *, const struct state *), const long offset, const struct state *sp) -{ - struct timeval t; - int samei, otheri; - int sameind, otherind; - int i; - int nseen; - int seen[TZ_MAX_TYPES]; - int types[TZ_MAX_TYPES]; - int okay; - - if (tmp->tm_isdst > 1) - tmp->tm_isdst = 1; - t = time2(tmp, funcp, offset, &okay, sp); -#ifdef PCTS - /* - ** PCTS code courtesy Grant Sullivan. - */ - 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 ast_tm" that's bad. - ** We try to divine the type they started from and adjust to the - ** type they need. - */ - if (sp == NULL) - return WRONG; - for (i = 0; i < sp->typecnt; ++i) - seen[i] = FALSE; - nseen = 0; - for (i = sp->timecnt - 1; i >= 0; --i) - if (!seen[sp->types[i]]) { - seen[sp->types[i]] = TRUE; - types[nseen++] = sp->types[i]; - } - for (sameind = 0; sameind < nseen; ++sameind) { - samei = types[sameind]; - if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) - continue; - for (otherind = 0; otherind < nseen; ++otherind) { - otheri = types[otherind]; - 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, sp); - 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; -} - -struct timeval ast_mktime(struct ast_tm *tmp, const char *zone) -{ - const struct state *sp; - if (!(sp = ast_tzset(zone))) - return WRONG; - return time1(tmp, localsub, 0L, sp); -} - -int ast_strftime(char *buf, size_t len, const char *tmp, const struct ast_tm *tm) -{ - size_t fmtlen = strlen(tmp) + 1; - char *format = ast_calloc(1, fmtlen), *fptr = format, *newfmt; - int decimals = -1, i, res; - long fraction; - - if (!format) - return -1; - for (; *tmp; tmp++) { - if (*tmp == '%') { - switch (tmp[1]) { - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - if (tmp[2] != 'q') - goto defcase; - decimals = tmp[1] - '0'; - tmp++; - /* Fall through */ - case 'q': /* Milliseconds */ - if (decimals == -1) - decimals = 3; - - /* Juggle some memory to fit the item */ - newfmt = ast_realloc(format, fmtlen + decimals); - if (!newfmt) { - ast_free(format); - return -1; - } - fptr = fptr - format + newfmt; - format = newfmt; - fmtlen += decimals; - - /* Reduce the fraction of time to the accuracy needed */ - for (i = 6, fraction = tm->tm_usec; i > decimals; i--) - fraction /= 10; - fptr += sprintf(fptr, "%0*ld", decimals, fraction); - - /* Reset, in case more than one 'q' specifier exists */ - decimals = -1; - tmp++; - break; - default: - goto defcase; - } - } else -defcase: *fptr++ = *tmp; - } - *fptr = '\0'; -#undef strftime - res = (int)strftime(buf, len, format, (struct tm *)tm); - ast_free(format); - return res; -} - |