/* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). */ /* Temporarily merged private.h and tzfile.h for ease of management - DJ */ #include "winsup.h" #include "cygerrno.h" #include #define lint #define USG_COMPAT #ifndef lint #ifndef NOID static char elsieid[] = "@(#)localtime.c 7.66"; #endif /* !defined NOID */ #endif /* !defined lint */ /* ** Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu). ** POSIX-style TZ environment variable handling from Guy Harris ** (guy@auspex.com). */ /*LINTLIBRARY*/ #ifndef PRIVATE_H #define PRIVATE_H /* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). */ /* ** This header is for use ONLY with the time conversion code. ** There is no guarantee that it will remain unchanged, ** or that it will remain at all. ** Do NOT copy it to any system include directory. ** Thank you! */ /* ** ID */ #ifndef lint #ifndef NOID static char privatehid[] = "@(#)private.h 7.48"; #endif /* !defined NOID */ #endif /* !defined lint */ /* ** Defaults for preprocessor symbols. ** You can override these in your C compiler options, e.g. `-DHAVE_ADJTIME=0'. */ #ifndef HAVE_ADJTIME #define HAVE_ADJTIME 1 #endif /* !defined HAVE_ADJTIME */ #ifndef HAVE_GETTEXT #define HAVE_GETTEXT 0 #endif /* !defined HAVE_GETTEXT */ #ifndef HAVE_SETTIMEOFDAY #define HAVE_SETTIMEOFDAY 3 #endif /* !defined HAVE_SETTIMEOFDAY */ #ifndef HAVE_STRERROR #define HAVE_STRERROR 0 #endif /* !defined HAVE_STRERROR */ #ifndef HAVE_SYMLINK #define HAVE_SYMLINK 1 #endif /* !defined HAVE_SYMLINK */ #ifndef HAVE_UNISTD_H #define HAVE_UNISTD_H 1 #endif /* !defined HAVE_UNISTD_H */ #ifndef HAVE_UTMPX_H #define HAVE_UTMPX_H 0 #endif /* !defined HAVE_UTMPX_H */ #ifndef LOCALE_HOME #define LOCALE_HOME "/usr/lib/locale" #endif /* !defined LOCALE_HOME */ /* ** Nested includes */ #include "sys/types.h" /* for time_t */ #include "stdio.h" #include "limits.h" /* for CHAR_BIT */ #include "time.h" #include "stdlib.h" #if HAVE_GETTEXT - 0 #include "libintl.h" #endif /* HAVE_GETTEXT - 0 */ #if HAVE_UNISTD_H - 0 #include "unistd.h" /* for F_OK and R_OK */ #endif /* HAVE_UNISTD_H - 0 */ #if !(HAVE_UNISTD_H - 0) #ifndef F_OK #define F_OK 0 #endif /* !defined F_OK */ #ifndef R_OK #define R_OK 4 #endif /* !defined R_OK */ #endif /* !(HAVE_UNISTD_H - 0) */ /* Unlike 's isdigit, this also works if c < 0 | c > UCHAR_MAX. */ #define is_digit(c) ((unsigned)(c) - '0' <= 9) /* ** Workarounds for compilers/systems. */ /* ** SunOS 4.1.1 cc lacks const. */ #ifndef const #ifndef __STDC__ #define const #endif /* !defined __STDC__ */ #endif /* !defined const */ /* ** SunOS 4.1.1 cc lacks prototypes. */ #ifndef P #ifdef __STDC__ #define P(x) x #endif /* defined __STDC__ */ #ifndef __STDC__ #define P(x) () #endif /* !defined __STDC__ */ #endif /* !defined P */ /* ** SunOS 4.1.1 headers lack EXIT_SUCCESS. */ #ifndef EXIT_SUCCESS #define EXIT_SUCCESS 0 #endif /* !defined EXIT_SUCCESS */ /* ** SunOS 4.1.1 headers lack EXIT_FAILURE. */ #ifndef EXIT_FAILURE #define EXIT_FAILURE 1 #endif /* !defined EXIT_FAILURE */ /* ** SunOS 4.1.1 headers lack FILENAME_MAX. */ #ifndef FILENAME_MAX #ifndef MAXPATHLEN #ifdef unix #include "sys/param.h" #endif /* defined unix */ #endif /* !defined MAXPATHLEN */ #ifdef MAXPATHLEN #define FILENAME_MAX MAXPATHLEN #endif /* defined MAXPATHLEN */ #ifndef MAXPATHLEN #define FILENAME_MAX 1024 /* Pure guesswork */ #endif /* !defined MAXPATHLEN */ #endif /* !defined FILENAME_MAX */ /* ** SunOS 4.1.1 libraries lack remove. */ #ifndef remove extern int unlink P((const char * filename)); #define remove unlink #endif /* !defined remove */ /* ** Finally, some convenience items. */ #ifndef TYPE_BIT #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) #endif /* !defined TYPE_BIT */ #ifndef TYPE_SIGNED #define TYPE_SIGNED(type) (((type) -1) < 0) #endif /* !defined TYPE_SIGNED */ #ifndef INT_STRLEN_MAXIMUM /* ** 302 / 1000 is log10(2.0) rounded up. ** Subtract one for the sign bit if the type is signed; ** add one for integer division truncation; ** add one more for a minus sign if the type is signed. */ #define INT_STRLEN_MAXIMUM(type) \ ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) #endif /* !defined INT_STRLEN_MAXIMUM */ /* ** INITIALIZE(x) */ #ifndef GNUC_or_lint #ifdef lint #define GNUC_or_lint #endif /* defined lint */ #ifndef lint #ifdef __GNUC__ #define GNUC_or_lint #endif /* defined __GNUC__ */ #endif /* !defined lint */ #endif /* !defined GNUC_or_lint */ #ifndef INITIALIZE #ifdef GNUC_or_lint #define INITIALIZE(x) ((x) = 0) #endif /* defined GNUC_or_lint */ #ifndef GNUC_or_lint #define INITIALIZE(x) #endif /* !defined GNUC_or_lint */ #endif /* !defined INITIALIZE */ /* ** For the benefit of GNU folk... ** `_(MSGID)' uses the current locale's message library string for MSGID. ** The default is to use gettext if available, and use MSGID otherwise. */ #ifndef _ #if HAVE_GETTEXT - 0 #define _(msgid) gettext(msgid) #else /* !(HAVE_GETTEXT - 0) */ #define _(msgid) msgid #endif /* !(HAVE_GETTEXT - 0) */ #endif /* !defined _ */ #ifndef TZ_DOMAIN #define TZ_DOMAIN "tz" #endif /* !defined TZ_DOMAIN */ /* ** UNIX was a registered trademark of UNIX System Laboratories in 1993. */ #endif /* !defined PRIVATE_H */ #ifndef TZFILE_H #define TZFILE_H /* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). */ /* ** This header is for use ONLY with the time conversion code. ** There is no guarantee that it will remain unchanged, ** or that it will remain at all. ** Do NOT copy it to any system include directory. ** Thank you! */ /* ** ID */ #ifndef lint #ifndef NOID static char tzfilehid[] = "@(#)tzfile.h 7.14"; #endif /* !defined NOID */ #endif /* !defined lint */ /* ** Information about time zone files. */ #ifndef TZDIR #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ #endif /* !defined TZDIR */ #ifndef TZDEFAULT #define TZDEFAULT "localtime" #endif /* !defined TZDEFAULT */ #ifndef TZDEFRULES #define TZDEFRULES "posixrules" #endif /* !defined TZDEFRULES */ /* ** Each file begins with. . . */ #define TZ_MAGIC "TZif" struct tzhead { char tzh_magic[4]; /* TZ_MAGIC */ char tzh_reserved[16]; /* reserved for future use */ char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ char tzh_leapcnt[4]; /* coded number of leap seconds */ char tzh_timecnt[4]; /* coded number of transition times */ char tzh_typecnt[4]; /* coded number of local time types */ char tzh_charcnt[4]; /* coded number of abbr. chars */ }; /* ** . . .followed by. . . ** ** tzh_timecnt (char [4])s coded transition times a la time(2) ** tzh_timecnt (unsigned char)s types of local time starting at above ** tzh_typecnt repetitions of ** one (char [4]) coded UTC offset in seconds ** one (unsigned char) used to set tm_isdst ** one (unsigned char) that's an abbreviation list index ** tzh_charcnt (char)s '\0'-terminated zone abbreviations ** tzh_leapcnt repetitions of ** one (char [4]) coded leap second transition times ** one (char [4]) total correction after above ** tzh_ttisstdcnt (char)s indexed by type; if true, transition ** time is standard time, if false, ** transition time is wall clock time ** if absent, transition times are ** assumed to be wall clock time ** tzh_ttisgmtcnt (char)s indexed by type; if true, transition ** time is UTC, if false, ** transition time is local time ** if absent, transition times are ** assumed to be local time */ /* ** In the current implementation, "tzset()" refuses to deal with files that ** exceed any of the limits below. */ #ifndef TZ_MAX_TIMES /* ** The TZ_MAX_TIMES value below is enough to handle a bit more than a ** year's worth of solar time (corrected daily to the nearest second) or ** 138 years of Pacific Presidential Election time ** (where there are three time zone transitions every fourth year). */ #define TZ_MAX_TIMES 370 #endif /* !defined TZ_MAX_TIMES */ #ifndef TZ_MAX_TYPES #ifndef NOSOLAR #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ #endif /* !defined NOSOLAR */ #ifdef NOSOLAR /* ** Must be at least 14 for Europe/Riga as of Jan 12 1995, ** as noted by Earl Chew . */ #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ #endif /* !defined NOSOLAR */ #endif /* !defined TZ_MAX_TYPES */ #ifndef TZ_MAX_CHARS #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ /* (limited by what unsigned chars can hold) */ #endif /* !defined TZ_MAX_CHARS */ #ifndef TZ_MAX_LEAPS #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ #endif /* !defined TZ_MAX_LEAPS */ #define SECSPERMIN 60 #define MINSPERHOUR 60 #define HOURSPERDAY 24 #define DAYSPERWEEK 7 #define DAYSPERNYEAR 365 #define DAYSPERLYEAR 366 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) #define MONSPERYEAR 12 #define TM_SUNDAY 0 #define TM_MONDAY 1 #define TM_TUESDAY 2 #define TM_WEDNESDAY 3 #define TM_THURSDAY 4 #define TM_FRIDAY 5 #define TM_SATURDAY 6 #define TM_JANUARY 0 #define TM_FEBRUARY 1 #define TM_MARCH 2 #define TM_APRIL 3 #define TM_MAY 4 #define TM_JUNE 5 #define TM_JULY 6 #define TM_AUGUST 7 #define TM_SEPTEMBER 8 #define TM_OCTOBER 9 #define TM_NOVEMBER 10 #define TM_DECEMBER 11 #define TM_YEAR_BASE 1900 #define EPOCH_YEAR 1970 #define EPOCH_WDAY TM_THURSDAY /* ** Accurate only for the past couple of centuries; ** that will probably do. */ #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) #ifndef USG /* ** Use of the underscored variants may cause problems if you move your code to ** certain System-V-based systems; for maximum portability, use the ** underscore-free variants. The underscored variants are provided for ** backward compatibility only; they may disappear from future versions of ** this file. */ #define SECS_PER_MIN SECSPERMIN #define MINS_PER_HOUR MINSPERHOUR #define HOURS_PER_DAY HOURSPERDAY #define DAYS_PER_WEEK DAYSPERWEEK #define DAYS_PER_NYEAR DAYSPERNYEAR #define DAYS_PER_LYEAR DAYSPERLYEAR #define SECS_PER_HOUR SECSPERHOUR #define SECS_PER_DAY SECSPERDAY #define MONS_PER_YEAR MONSPERYEAR #endif /* !defined USG */ #endif /* !defined TZFILE_H */ #include "fcntl.h" /* ** 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 */ #ifndef WILDABBR /* ** Someone might make incorrect use of a time zone abbreviation: ** 1. They might reference tzname[0] before calling tzset (explicitly ** or implicitly). ** 2. They might reference tzname[1] before calling 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[] NO_COPY = WILDABBR; static char gmt[] NO_COPY = "GMT"; 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 */ }; 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 */ struct state { 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 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 * getzname P((const char * strp)); 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)); static void localsub P((const time_t * timep, long offset, struct tm * tmp)); static int increment_overflow P((int * number, int delta)); static int normalize_overflow P((int * tensptr, int * unitsptr, int base)); static void settzname P((void)); static time_t time1 P((struct tm * tmp, void(*funcp) P((const time_t *, long, struct tm *)), long offset)); static time_t time2 P((struct tm *tmp, void(*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp)); static time_t time2sub P((struct tm *tmp, void(*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp, int do_norm_secs)); 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)); #ifdef ALL_STATE static struct state * lclptr; static struct state * gmtptr; #endif /* defined ALL_STATE */ #ifndef ALL_STATE static struct state lclmem; static struct state gmtmem; #define lclptr (&lclmem) #define gmtptr (&gmtmem) #endif /* State Farm */ #ifndef TZ_STRLEN_MAX #define TZ_STRLEN_MAX 255 #endif /* !defined TZ_STRLEN_MAX */ static char lcl_TZname[TZ_STRLEN_MAX + 1]; static int lcl_is_set; static int gmt_is_set; #define tzname _tzname #undef _tzname char * tzname[2] = { wildabbr, wildabbr }; /* ** 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 struct tm tm; /* These variables are initialized by tzset. The macro versions are defined in time.h, and indirect through the __imp_ pointers. */ #define timezone _timezone #define daylight _daylight #undef _timezone #undef _daylight #ifdef USG_COMPAT time_t timezone; int daylight; #endif /* defined USG_COMPAT */ #ifdef ALTZONE time_t altzone; #endif /* defined ALTZONE */ static long detzcode(const char *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 void settzname P((void)) { register struct state * const sp = lclptr; register int i; tzname[0] = wildabbr; tzname[1] = wildabbr; #ifdef USG_COMPAT daylight = 0; timezone = 0; #endif /* defined USG_COMPAT */ #ifdef ALTZONE altzone = 0; #endif /* defined ALTZONE */ #ifdef ALL_STATE if (sp == NULL) { tzname[0] = tzname[1] = gmt; return; } #endif /* defined ALL_STATE */ for (i = 0; i < sp->typecnt; ++i) { register const struct ttinfo * const ttisp = &sp->ttis[i]; tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind]; #ifdef USG_COMPAT if (ttisp->tt_isdst) daylight = 1; if (i == 0 || !ttisp->tt_isdst) timezone = -(ttisp->tt_gmtoff); #endif /* defined USG_COMPAT */ #ifdef ALTZONE if (i == 0 || ttisp->tt_isdst) altzone = -(ttisp->tt_gmtoff); #endif /* defined ALTZONE */ } /* ** And to get the latest zone names into tzname. . . */ for (i = 0; i < sp->timecnt; ++i) { register const struct ttinfo * const ttisp = &sp->ttis[ sp->types[i]]; tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind]; } } #include "tz_posixrules.h" static int tzload(const char *name, struct state *sp) { register const char * p; register int i; register int fid; save_errno save; if (name == NULL && (name = TZDEFAULT) == NULL) return -1; { register 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 0 if (doaccess && access(name, R_OK) != 0) return -1; #endif if ((fid = open(name, OPEN_MODE)) == -1) { const char *base = strrchr(name, '/'); if (base) base++; else base = name; if (strcmp(base, "posixrules")) return -1; /* We've got a built-in copy of posixrules just in case */ fid = -2; } } { struct tzhead * tzhp; union { struct tzhead tzhead; char buf[sizeof *sp + sizeof *tzhp]; } u; int ttisstdcnt; int ttisgmtcnt; if (fid == -2) { memcpy(u.buf, _posixrules_data, sizeof (_posixrules_data)); i = sizeof (_posixrules_data); } else { i = read(fid, u.buf, sizeof u.buf); if (close(fid) != 0) return -1; } ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); 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 (i - (p - u.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 }; /* ** 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) { register char c; while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && c != '+') ++strp; return strp; } /* ** 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) { 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; } /* ** 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 *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; } /* ** 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) { 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; } /* ** 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; } /* ** 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, long offset) { register int leapyear; register time_t value; register 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; } /* ** 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; register time_t * atp; register unsigned char * typep; register char * cp; register 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 { name = getzname(name); stdlen = name - stdname; if (stdlen < 3) return -1; if (*name == '\0') return -1; name = getoffset(name, &stdoffset); if (name == NULL) return -1; } load_result = tzload(TZDEFRULES, sp); if (load_result != 0) sp->leapcnt = 0; /* so, we're off a little */ if (*name != '\0') { dstname = name; name = getzname(name); dstlen = name - dstname; /* length of DST zone name */ if (dstlen < 3) return -1; 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; 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 void gmtload(struct state *sp) { if (tzload(gmt, sp) != 0) (void) tzparse(gmt, sp, true); } #ifndef STD_INSPIRED /* ** A non-static declaration of tzsetwall in a system header file ** may cause a warning about this upcoming static declaration... */ static #endif /* !defined STD_INSPIRED */ void tzsetwall P((void)) { if (lcl_is_set < 0) return; lcl_is_set = -1; #ifdef ALL_STATE if (lclptr == NULL) { lclptr = (struct state *) malloc(sizeof *lclptr); if (lclptr == NULL) { settzname(); /* all we can do */ return; } } #endif /* defined ALL_STATE */ #if defined (_WIN32) || defined (__CYGWIN__) #define is_upper(c) ((unsigned)(c) - 'A' <= 26) { TIME_ZONE_INFORMATION tz; char buf[BUFSIZ]; char *cp, *dst; wchar_t *src; div_t d; GetTimeZoneInformation(&tz); dst = cp = buf; for (src = tz.StandardName; *src; src++) if (is_upper(*src)) *dst++ = *src; if ((dst - cp) < 3) { /* In non-english Windows, converted tz.StandardName may not contain a valid standard timezone name. */ strcpy(cp, wildabbr); cp += strlen(wildabbr); } else cp = dst; d = div(tz.Bias+tz.StandardBias, 60); sprintf(cp, "%d", d.quot); if (d.rem) sprintf(cp=strchr(cp, 0), ":%d", abs(d.rem)); if(tz.StandardDate.wMonth) { cp = strchr(cp, 0); dst = cp; for (src = tz.DaylightName; *src; src++) if (is_upper(*src)) *dst++ = *src; if ((dst - cp) < 3) { /* In non-english Windows, converted tz.DaylightName may not contain a valid daylight timezone name. */ strcpy(cp, wildabbr); cp += strlen(wildabbr); } else cp = dst; d = div(tz.Bias+tz.DaylightBias, 60); sprintf(cp, "%d", d.quot); if (d.rem) sprintf(cp=strchr(cp, 0), ":%d", abs(d.rem)); cp = strchr(cp, 0); sprintf(cp=strchr(cp, 0), ",M%d.%d.%d/%d", tz.DaylightDate.wMonth, tz.DaylightDate.wDay, tz.DaylightDate.wDayOfWeek, tz.DaylightDate.wHour); if (tz.DaylightDate.wMinute || tz.DaylightDate.wSecond) sprintf(cp=strchr(cp, 0), ":%d", tz.DaylightDate.wMinute); if (tz.DaylightDate.wSecond) sprintf(cp=strchr(cp, 0), ":%d", tz.DaylightDate.wSecond); cp = strchr(cp, 0); sprintf(cp=strchr(cp, 0), ",M%d.%d.%d/%d", tz.StandardDate.wMonth, tz.StandardDate.wDay, tz.StandardDate.wDayOfWeek, tz.StandardDate.wHour); if (tz.StandardDate.wMinute || tz.StandardDate.wSecond) sprintf(cp=strchr(cp, 0), ":%d", tz.StandardDate.wMinute); if (tz.StandardDate.wSecond) sprintf(cp=strchr(cp, 0), ":%d", tz.StandardDate.wSecond); } /* printf("TZ deduced as `%s'\n", buf); */ if (tzparse(buf, lclptr, false) == 0) { settzname(); lcl_is_set = 1; strlcpy(lcl_TZname, buf, sizeof (lcl_TZname)); setenv("TZ", lcl_TZname, 1); return; } } #endif if (tzload((char *) NULL, lclptr) != 0) gmtload(lclptr); settzname(); } extern "C" void tzset P((void)) { const char * name = getenv("TZ"); if (name == NULL) { tzsetwall(); return; } if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) return; lcl_is_set = (strlen(name) < sizeof (lcl_TZname)); if (lcl_is_set) (void) strcpy(lcl_TZname, name); #ifdef ALL_STATE if (lclptr == NULL) { lclptr = (struct state *) malloc(sizeof *lclptr); if (lclptr == NULL) { settzname(); /* all we can do */ return; } } #endif /* defined ALL_STATE */ if (*name == '\0') { /* ** User wants it fast rather than right. */ lclptr->leapcnt = 0; /* so, we're off a little */ lclptr->timecnt = 0; lclptr->ttis[0].tt_gmtoff = 0; lclptr->ttis[0].tt_abbrind = 0; (void) strcpy(lclptr->chars, gmt); } else if (tzload(name, lclptr) != 0) { if (name[0] == ':' || tzparse(name, lclptr, false) != 0) (void) gmtload(lclptr); } settzname(); } /* ** 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 (const time_t * const timep, const long offset, struct tm * const tmp) { register struct state * sp; register const struct ttinfo * ttisp; register int i; const time_t t = *timep; sp = lclptr; #ifdef ALL_STATE if (sp == NULL) { gmtsub(timep, offset, tmp); return; } #endif /* defined ALL_STATE */ 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 */ } extern "C" struct tm * localtime(const time_t *timep) { tzset(); localsub(timep, 0L, &tm); return &tm; } /* * Re-entrant version of localtime */ extern "C" struct tm * localtime_r(const time_t *timep, struct tm *tm) { localsub(timep, 0L, tm); return tm; } /* ** gmtsub is to gmtime as localsub is to localtime. */ static void gmtsub(const time_t *timep, const long offset, struct tm *tmp) { if (!gmt_is_set) { gmt_is_set = true; #ifdef ALL_STATE gmtptr = (struct state *) malloc(sizeof *gmtptr); if (gmtptr != NULL) #endif /* defined ALL_STATE */ gmtload(gmtptr); } timesub(timep, offset, gmtptr, 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 = wildabbr; else { #ifdef ALL_STATE if (gmtptr == NULL) tmp->TM_ZONE = gmt; else tmp->TM_ZONE = gmtptr->chars; #endif /* defined ALL_STATE */ #ifndef ALL_STATE tmp->TM_ZONE = gmtptr->chars; #endif /* State Farm */ } #endif /* defined TM_ZONE */ } extern "C" struct tm * gmtime(const time_t *timep) { gmtsub(timep, 0L, &tm); return &tm; } /* * Re-entrant version of gmtime */ extern "C" struct tm * gmtime_r(const time_t *timep, struct tm *tm) { gmtsub(timep, 0L, tm); return tm; } #ifdef STD_INSPIRED extern "C" struct tm * offtime(const time_t *timep, const long offset) { gmtsub(timep, offset, &tm); return &tm; } #endif /* defined STD_INSPIRED */ static void timesub(const time_t *timep, const long offset, const struct state *sp, struct tm *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; #ifdef ALL_STATE i = (sp == NULL) ? 0 : sp->leapcnt; #endif /* defined ALL_STATE */ #ifndef ALL_STATE i = sp->leapcnt; #endif /* State Farm */ 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 */ } extern "C" char * ctime(const time_t *timep) { /* ** Section 4.12.3.2 of X3.159-1989 requires that ** The ctime function 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)); } extern "C" char * ctime_r(const time_t *timep, char *buf) { struct tm tm; return asctime_r(localtime_r(timep, &tm), buf); } /* ** 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(int *number, int delta) { int number0; number0 = *number; *number += delta; return (*number < number0) != (delta < 0); } static int normalize_overflow(int *tensptr, int *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(register const struct tm *atmp, register const struct tm *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 time2sub(struct tm *tmp, void (*funcp) P((const time_t*, long, struct tm*)), const long offset, int *okayp, const int do_norm_secs) { 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 (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; 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); 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); #ifdef ALL_STATE if (sp == NULL) return WRONG; #endif /* defined ALL_STATE */ 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); 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); *okayp = true; return t; } static time_t time2(struct tm *tmp, void (*funcp) P((const time_t*, long, struct tm*)), const long offset, int *okayp) { time_t t; /* ** 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); return *okayp ? t : time2sub(tmp, funcp, offset, okayp, true); } static time_t time1(struct tm *tmp, void (*funcp) P((const time_t *, long, struct tm *)), const long offset) { 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); #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); #ifdef ALL_STATE if (sp == NULL) return WRONG; #endif /* defined ALL_STATE */ 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); 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; } extern "C" time_t mktime(struct tm *tmp) { tzset(); return time1(tmp, localsub, 0L); } #ifdef STD_INSPIRED extern "C" time_t timelocal(struct tm *tmp) { tmp->tm_isdst = -1; /* in case it wasn't initialized */ return mktime(tmp); } extern "C" time_t timegm(struct tm *tmp) { tmp->tm_isdst = 0; return time1(tmp, gmtsub, 0L); } extern "C" time_t timeoff(struct tm *tmp, const long offset) { tmp->tm_isdst = 0; return time1(tmp, gmtsub, offset); } #endif /* defined STD_INSPIRED */ #ifdef CMUCS /* ** The following is supplied for compatibility with ** previous versions of the CMUCS runtime library. */ extern "C" long gtime(struct tm *tmp) { const time_t t = mktime(tmp); if (t == WRONG) return -1; return t; } #endif /* defined CMUCS */ /* ** XXX--is the below the right way to conditionalize?? */ #ifdef STD_INSPIRED /* ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which ** is not the case if we are accounting for leap seconds. ** So, we provide the following conversion routines for use ** when exchanging timestamps with POSIX conforming systems. */ static long leapcorr(time_t *timep) { register struct state * sp; register struct lsinfo * lp; register int i; sp = lclptr; i = sp->leapcnt; while (--i >= 0) { lp = &sp->lsis[i]; if (*timep >= lp->ls_trans) return lp->ls_corr; } return 0; } extern "C" time_t time2posix(time_t t) { tzset(); return t - leapcorr(&t); } extern "C" time_t posix2time(time_t t) { time_t x; time_t y; tzset(); /* ** For a positive leap second hit, the result ** is not unique. For a negative leap second ** hit, the corresponding time doesn't exist, ** so we return an adjacent second. */ x = t + leapcorr(&t); y = x - leapcorr(&x); if (y < t) { do { x++; y = x - leapcorr(&x); } while (y < t); if (t != y) return x - 1; } else if (y > t) { do { --x; y = x - leapcorr(&x); } while (y > t); if (t != y) return x + 1; } return x; } #endif /* defined STD_INSPIRED */