/* Parse a string, yielding a struct partime that describes it. */ /* Copyright (C) 1993, 1994, 1995, 1997, 2002 Paul Eggert Distributed under license by the Free Software Foundation, Inc. This file is part of RCS. RCS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. RCS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with RCS; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Report problems and direct all questions to: rcs-bugs@cs.purdue.edu */ #if has_conf_h # include #else # if HAVE_CONFIG_H # include # else # ifndef __STDC__ # define const # endif # endif # if HAVE_LIMITS_H # include # endif # ifndef LONG_MIN # define LONG_MIN (-1-2147483647L) # endif # if HAVE_STDDEF_H # include # endif # if STDC_HEADERS # include # endif # include # ifdef __STDC__ # define P(x) x # else # define P(x) () # endif #endif #ifndef offsetof #define offsetof(aggregate, member) ((size_t) &((aggregate *) 0)->member) #endif #include #if STDC_HEADERS # define CTYPE_DOMAIN(c) 1 #else # define CTYPE_DOMAIN(c) ((unsigned) (c) <= 0177) #endif #define ISALNUM(c) (CTYPE_DOMAIN (c) && isalnum (c)) #define ISALPHA(c) (CTYPE_DOMAIN (c) && isalpha (c)) #define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c)) #define ISUPPER(c) (CTYPE_DOMAIN (c) && isupper (c)) #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) #include char const partime_id[] = "$Id: partime.c,v 1.2 2002/02/18 07:42:58 eggert Exp $"; /* Lookup tables for names of months, weekdays, time zones. */ #define NAME_LENGTH_MAXIMUM 4 struct name_val { char name[NAME_LENGTH_MAXIMUM]; int val; }; static char const *parse_decimal P ((char const *, int, int, int, int, int *, int *)); static char const *parse_fixed P ((char const *, int, int *)); static char const *parse_pattern_letter P ((char const *, int, struct partime *)); static char const *parse_prefix P ((char const *, char const **, struct partime *)); static char const *parse_ranged P ((char const *, int, int, int, int *)); static char const *parse_varying P ((char const *, int *)); static int lookup P ((char const *, struct name_val const[])); static int merge_partime P ((struct partime *, struct partime const *)); static void undefine P ((struct partime *)); static struct name_val const month_names[] = { {"jan", 0}, {"feb", 1}, {"mar", 2}, {"apr", 3}, {"may", 4}, {"jun", 5}, {"jul", 6}, {"aug", 7}, {"sep", 8}, {"oct", 9}, {"nov", 10}, {"dec", 11}, {"", TM_UNDEFINED} }; static struct name_val const weekday_names[] = { {"sun", 0}, {"mon", 1}, {"tue", 2}, {"wed", 3}, {"thu", 4}, {"fri", 5}, {"sat", 6}, {"", TM_UNDEFINED} }; #define RELATIVE_CONS(member, multiplier) \ (offsetof (struct tm, member) + (multiplier) * sizeof (struct tm)) #define RELATIVE_OFFSET(c) ((c) % sizeof (struct tm)) #define RELATIVE_MULTIPLIER(c) ((c) / sizeof (struct tm)) static struct name_val const relative_units[] = { {"year", RELATIVE_CONS (tm_year, 1) }, {"mont", RELATIVE_CONS (tm_mon , 1) }, {"fort", RELATIVE_CONS (tm_mday, 14) }, {"week", RELATIVE_CONS (tm_mday, 7) }, {"day" , RELATIVE_CONS (tm_mday, 1) }, {"hour", RELATIVE_CONS (tm_hour, 1) }, {"min" , RELATIVE_CONS (tm_min , 1) }, {"sec" , RELATIVE_CONS (tm_sec , 1) }, {"", TM_UNDEFINED} }; static struct name_val const ago[] = { {"ago", 0}, {"", TM_UNDEFINED} }; static struct name_val const dst_names[] = { {"dst", 1}, {"", 0} }; #define hr60nonnegative(t) ((t)/100 * 60 + (t)%100) #define hr60(t) ((t) < 0 ? - hr60nonnegative (-(t)) : hr60nonnegative (t)) #define zs(t, s) {s, hr60 (t)} #define zd(t, s, d) zs (t, s), zs ((t) + 100, d) static struct name_val const zone_names[] = { zs (-1000, "hst"), /* Hawaii */ zd (-1000, "hast", "hadt"), /* Hawaii-Aleutian */ zd (- 900, "akst", "akdt"), /* Alaska */ zd (- 800, "pst" , "pdt" ), /* Pacific */ zd (- 700, "mst" , "mdt" ), /* Mountain */ zd (- 600, "cst" , "cdt" ), /* Central */ zd (- 500, "est" , "edt" ), /* Eastern */ zd (- 400, "ast" , "adt" ), /* Atlantic */ zd (- 330, "nst" , "ndt" ), /* Newfoundland */ zs ( 000, "utc" ), /* Coordinated Universal */ zs ( 000, "uct" ), /* " */ zs ( 000, "cut" ), /* " */ zs ( 000, "ut"), /* Universal */ zs ( 000, "z"), /* Zulu (required by ISO 8601) */ zd ( 000, "gmt" , "bst" ), /* Greenwich Mean, British Summer */ zd ( 000, "wet" , "west"), /* Western European */ zd ( 100, "cet" , "cest"), /* Central European */ zd ( 100, "met" , "mest"), /* Middle European (bug in old tz versions) */ zd ( 100, "mez" , "mesz"), /* Mittel-Europaeische Zeit */ zd ( 200, "eet" , "eest"), /* Eastern European */ zs ( 530, "ist" ), /* India */ zd ( 900, "jst" , "jdt" ), /* Japan */ zd ( 900, "kst" , "kdt" ), /* Korea */ zd ( 1200, "nzst", "nzdt"), /* New Zealand */ {"lt", 1}, #if 0 /* The following names are duplicates or are not well attested. It's not worth keeping a complete list, since alphabetic time zone names are deprecated and there are lots more where these came from. */ zs (-1100, "sst" ), /* Samoan */ zd (- 900, "yst" , "ydt" ), /* Yukon - name is no longer used */ zd (- 500, "ast" , "adt" ), /* Acre */ zd (- 400, "wst" , "wdt" ), /* Western Brazil */ zd (- 400, "cst" , "cdt" ), /* Chile */ zd (- 200, "fst" , "fdt" ), /* Fernando de Noronha */ zs ( 000, "wat" ), /* West African */ zs ( 100, "cat" ), /* Central African */ zs ( 200, "sat" ), /* South African */ zd ( 200, "ist" , "idt" ), /* Israel */ zs ( 300, "eat" ), /* East African */ zd ( 300, "msk" , "msd" ), /* Moscow */ zd ( 330, "ist" , "idt" ), /* Iran */ zs ( 800, "hkt" ), /* Hong Kong */ zs ( 800, "sgt" ), /* Singapore */ zd ( 800, "cst" , "cdt" ), /* China */ zd ( 800, "wst" , "wst" ), /* Western Australia */ zd ( 930, "cst" , "cst" ), /* Central Australia */ zs ( 1000, "gst" ), /* Guam */ zd ( 1000, "est" , "est" ), /* Eastern Australia */ #endif {"", -1} }; /* Look for a prefix of S in TABLE, returning val for first matching entry. */ static int lookup (s, table) char const *s; struct name_val const table[]; { int j; char buf[NAME_LENGTH_MAXIMUM]; for (j = 0; j < NAME_LENGTH_MAXIMUM; j++) { unsigned char c = *s; if (! ISALPHA (c)) { buf[j] = '\0'; break; } buf[j] = ISUPPER (c) ? tolower (c) : c; s++; s += *s == '.'; } for (;; table++) for (j = 0; ; j++) if (j == NAME_LENGTH_MAXIMUM || ! table[0].name[j]) return table[0].val; else if (buf[j] != table[0].name[j]) break; } /* Set *T to ``undefined'' values. */ static void undefine (t) struct partime *t; { t->tm.tm_sec = t->tm.tm_min = t->tm.tm_hour = t->tm.tm_mday = t->tm.tm_mon = t->tm.tm_year = t->tm.tm_wday = t->tm.tm_yday = t->wday_ordinal = t->ymodulus = t->yweek = TM_UNDEFINED; t->tmr.tm_sec = t->tmr.tm_min = t->tmr.tm_hour = t->tmr.tm_mday = t->tmr.tm_mon = t->tmr.tm_year = 0; t->zone = TM_UNDEFINED_ZONE; } /* Patterns to look for in a time string. Order is important: we look for the first matching pattern whose values do not contradict values that we already know about. See `parse_pattern_letter' below for the meaning of the pattern codes. */ static char const time_patterns[] = { /* Traditional patterns come first, to prevent an ISO 8601 format from misinterpreting their prefixes. */ /* RFC 822, extended */ 'E', '_', 'N', '_', 'y', '$', 0, 'x', 0, /* traditional */ '4', '_', 'M', '_', 'D', '_', 'h', '_', 'm', '_', 's', '$', 0, 'R', '_', 'M', '_', 'D', '_', 'h', '_', 'm', '_', 's', '$', 0, 'E', '_', 'N', 0, 'N', '_', 'E', '_', 'y', ';', 0, 'N', '_', 'E', ';', 0, 'N', 0, 't', ':', 'm', ':', 's', '_', 'A', 0, 't', ':', 'm', '_', 'A', 0, 't', '_', 'A', 0, /* traditional get_date */ 'i', '_', 'x', 0, 'Y', '/', 'n', '/', 'E', ';', 0, 'n', '/', 'E', '/', 'y', ';', 0, 'n', '/', 'E', ';', 0, 'u', 0, /* ISO 8601:1988 formats, generalized a bit. */ 'y', '-', 'M', '-', 'D', '$', 0, '4', 'M', 'D', '$', 0, 'Y', '-', 'M', '$', 0, 'R', 'M', 'D', '$', 0, '-', 'R', '=', 'M', '$', 0, '-', 'R', '$', 0, '-', '-', 'M', '=', 'D', '$', 0, 'M', '=', 'D', 'T', 0, '-', '-', 'M', '$', 0, '-', '-', '-', 'D', '$', 0, 'D', 'T', 0, 'Y', '-', 'd', '$', 0, '4', 'd', '$', 0, 'R', '=', 'd', '$', 0, '-', 'd', '$', 0, 'd', 'T', 0, 'y', '-', 'W', '-', 'X', 0, 'y', 'W', 'X', 0, 'y', '=', 'W', 0, '-', 'r', '-', 'W', '-', 'X', 0, 'r', '-', 'W', '-', 'X', 'T', 0, '-', 'r', 'W', 'X', 0, 'r', 'W', 'X', 'T', 0, '-', 'W', '=', 'X', 0, 'W', '=', 'X', 'T', 0, '-', 'W', 0, '-', 'w', '-', 'X', 0, 'w', '-', 'X', 'T', 0, '-', '-', '-', 'X', '$', 0, 'X', 'T', 0, '4', '$', 0, 'T', 0, 'h', ':', 'm', ':', 's', '$', 0, 'h', 'm', 's', '$', 0, 'h', ':', 'L', '$', 0, 'h', 'L', '$', 0, 'H', '$', 0, '-', 'm', ':', 's', '$', 0, '-', 'm', 's', '$', 0, '-', 'L', '$', 0, '-', '-', 's', '$', 0, 'Y', 0, 'Z', 0, 0 }; /* Parse an initial prefix of STR according to *PATTERNS, setting *T. Return the first character after the prefix, or 0 if it couldn't be parsed. *PATTERNS is a character array containing one pattern string after another; it is terminated by an empty string. If success, set *PATTERNS to the next pattern to try. Set *PATTERNS to 0 if we know there are no more patterns to try; if *PATTERNS is initially 0, give up immediately. */ static char const * parse_prefix (str, patterns, t) char const *str; char const **patterns; struct partime *t; { char const *pat = *patterns; unsigned char c; if (! pat) return 0; /* Remove initial noise. */ while (! ISALNUM (c = *str) && c != '-' && c != '+') { if (! c) { undefine (t); *patterns = 0; return str; } str++; } /* Try a pattern until one succeeds. */ while (*pat) { char const *s = str; undefine (t); do { if (! (c = *pat++)) { *patterns = pat; return s; } } while ((s = parse_pattern_letter (s, c, t)) != 0); while (*pat++) continue; } return 0; } /* Parse an initial prefix of S of length DIGITS; it must be a number. Store the parsed number into *RES. Return the first character after the prefix, or 0 if it wasn't parsed. */ static char const * parse_fixed (s, digits, res) char const *s; int digits, *res; { int n = 0; char const *lim = s + digits; while (s < lim) { unsigned d = *s++ - '0'; if (9 < d) return 0; n = 10 * n + d; } *res = n; return s; } /* Parse a possibly empty initial prefix of S. Store the parsed number into *RES. Return the first character after the prefix. */ static char const * parse_varying (s, res) char const *s; int *res; { int n = 0; for (;;) { unsigned d = *s - '0'; if (9 < d) break; s++; n = 10 * n + d; } *res = n; return s; } /* Parse an initial prefix of S of length DIGITS; it must be a number in the range LO through HI. Store the parsed number into *RES. Return the first character after the prefix, or 0 if it wasn't parsed. */ static char const * parse_ranged (s, digits, lo, hi, res) char const *s; int digits, lo, hi, *res; { s = parse_fixed (s, digits, res); return s && lo <= *res && *res <= hi ? s : 0; } /* Parse an initial prefix of S of length DIGITS; it must be a number in the range LO through HI and it may be followed by a fraction to be computed using RESOLUTION. Store the parsed number into *RES; store the fraction times RESOLUTION, rounded to the nearest integer, into *FRES. Return the first character after the prefix, or 0 if it wasn't parsed. */ static char const * parse_decimal (s, digits, lo, hi, resolution, res, fres) char const *s; int digits, lo, hi, resolution, *res, *fres; { s = parse_fixed (s, digits, res); if (s && lo <= *res && *res <= hi) { int f = 0; if ((s[0] == ',' || s[0] == '.') && ISDIGIT (s[1])) { char const *s1 = ++s; int num10 = 0, denom10 = 10, product; while (ISDIGIT (*++s)) { int d = denom10 * 10; if (d / 10 != denom10) return 0; /* overflow */ denom10 = d; } s = parse_fixed (s1, (int) (s - s1), &num10); product = num10 * resolution; f = (product + (denom10 >> 1)) / denom10; f -= f & (product % denom10 == denom10 >> 1); /* round to even */ if (f < 0 || product/resolution != num10) return 0; /* overflow */ } *fres = f; return s; } return 0; } /* Parse an initial prefix of S; it must denote a time zone. Set *ZONE to the number of seconds east of GMT, or to TM_LOCAL_ZONE if it is the local time zone. Return the first character after the prefix, or 0 if it wasn't parsed. */ char * parzone (s, zone) char const *s; long *zone; { char const *s1; char sign; int hh, mm, ss; int minutes_east_of_UTC; int trailing_DST; long offset, z; /* The formats are LT, n, n DST, nDST, no, o where n is a time zone name and o is a time zone offset of the form [-+]hh[:mm[:ss]]. */ switch (*s) { case '-': case '+': z = 0; break; default: minutes_east_of_UTC = lookup (s, zone_names); if (minutes_east_of_UTC == -1) return 0; /* Don't bother to check rest of spelling, but look for an embedded "DST". */ trailing_DST = 0; while (ISALPHA ((unsigned char) *s)) { if ((*s == 'D' || *s == 'd') && lookup (s, dst_names)) trailing_DST = 1; s++; s += *s == '.'; } /* Don't modify LT. */ if (minutes_east_of_UTC == 1) { *zone = TM_LOCAL_ZONE; return (char *) s; } z = minutes_east_of_UTC * 60L; s1 = s; /* Look for trailing "DST" or " DST". */ while (ISSPACE ((unsigned char) *s)) s++; if (lookup (s, dst_names)) { while (ISALPHA ((unsigned char) *s)) { s++; s += *s == '.'; } trailing_DST = 1; } if (trailing_DST) { *zone = z + 60*60; return (char *) s; } s = s1; switch (*s) { case '-': case '+': break; default: *zone = z; return (char *) s; } break; } sign = *s++; if (! (s = parse_ranged (s, 2, 0, 23, &hh))) return 0; mm = ss = 0; if (*s == ':') s++; if (ISDIGIT (*s)) { if (! (s = parse_ranged (s, 2, 0, 59, &mm))) return 0; if (*s == ':' && s[-3] == ':' && ISDIGIT (s[1]) && ! (s = parse_ranged (s + 1, 2, 0, 59, &ss))) return 0; } if (ISDIGIT (*s)) return 0; offset = (hh * 60 + mm) * 60L + ss; *zone = z + (sign == '-' ? -offset : offset); /* ?? Are fractions allowed here? If so, they're not implemented. */ return (char *) s; } /* Parse an initial prefix of S, matching the pattern whose code is C. Set *T accordingly. Return the first character after the prefix, or 0 if it wasn't parsed. */ static char const * parse_pattern_letter (s, c, t) char const *s; int c; struct partime *t; { char const *s0 = s; switch (c) { case '$': /* The next character must be a non-digit. */ if (ISDIGIT (*s)) return 0; break; case '-': case '/': case ':': /* These characters stand for themselves. */ if (*s++ != c) return 0; break; case '4': /* 4-digit year */ s = parse_fixed (s, 4, &t->tm.tm_year); break; case ';': /* The next character must be a non-digit, and cannot be ':'. */ if (ISDIGIT (*s) || *s == ':') return 0; break; case '=': /* optional '-' */ s += *s == '-'; break; case 'A': /* AM or PM */ /* This matches the regular expression [AaPp]\.?([Mm]\.?)?. It must not be followed by a letter or digit; otherwise it would match prefixes of strings like "PST". */ switch (*s) { case 'A': case 'a': if (t->tm.tm_hour == 12) t->tm.tm_hour = 0; break; case 'P': case 'p': if (t->tm.tm_hour != 12) t->tm.tm_hour += 12; break; default: return 0; } s++; s += *s == '.'; switch (*s) { case 'M': case 'm': s++; s += *s == '.'; break; } if (ISALNUM ((unsigned char) *s)) return 0; break; case 'D': /* day of month [01-31] */ s = parse_ranged (s, 2, 1, 31, &t->tm.tm_mday); break; case 'd': /* day of year [001-366] */ s = parse_ranged (s, 3, 1, 366, &t->tm.tm_yday); t->tm.tm_yday--; break; case 'E': /* traditional day of month [1-9, 01-31] */ s = parse_ranged (s, (ISDIGIT (s[0]) && ISDIGIT (s[1])) + 1, 1, 31, &t->tm.tm_mday); break; case 'h': /* hour [00-23] */ s = parse_ranged (s, 2, 0, 23, &t->tm.tm_hour); break; case 'H': /* hour [00-23 followed by optional fraction] */ { int frac; s = parse_decimal (s, 2, 0, 23, 60 * 60, &t->tm.tm_hour, &frac); t->tm.tm_min = frac / 60; t->tm.tm_sec = frac % 60; } break; case 'i': /* ordinal day number, e.g. "3rd" */ s = parse_varying (s, &t->wday_ordinal); if (s == s0) return 0; while (ISALPHA ((unsigned char) *s)) s++; break; case 'L': /* minute [00-59 followed by optional fraction] */ s = parse_decimal (s, 2, 0, 59, 60, &t->tm.tm_min, &t->tm.tm_sec); break; case 'm': /* minute [00-59] */ s = parse_ranged (s, 2, 0, 59, &t->tm.tm_min); break; case 'M': /* month [01-12] */ s = parse_ranged (s, 2, 1, 12, &t->tm.tm_mon); t->tm.tm_mon--; break; case 'n': /* traditional month [1-9, 01-12] */ s = parse_ranged (s, (ISDIGIT (s[0]) && ISDIGIT (s[1])) + 1, 1, 12, &t->tm.tm_mon); t->tm.tm_mon--; break; case 'N': /* month name [e.g. "Jan"] */ if (! TM_DEFINED (t->tm.tm_mon = lookup (s, month_names))) return 0; /* Don't bother to check rest of spelling. */ while (ISALPHA ((unsigned char) *s)) s++; break; case 'r': /* year % 10 (remainder in origin-0 decade) [0-9] */ s = parse_fixed (s, 1, &t->tm.tm_year); t->ymodulus = 10; break; case_R: case 'R': /* year % 100 (remainder in origin-0 century) [00-99] */ s = parse_fixed (s, 2, &t->tm.tm_year); t->ymodulus = 100; break; case 's': /* second [00-60 followed by optional fraction] */ { int frac; s = parse_decimal (s, 2, 0, 60, 1, &t->tm.tm_sec, &frac); t->tm.tm_sec += frac; } break; case 'T': /* 'T' or 't' */ switch (*s++) { case 'T': case 't': break; default: return 0; } break; case 't': /* traditional hour [1-9 or 01-12] */ s = parse_ranged (s, (ISDIGIT (s[0]) && ISDIGIT (s[1])) + 1, 1, 12, &t->tm.tm_hour); break; case 'u': /* relative unit */ { int i; int n; int negative = 0; switch (*s) { case '-': negative = 1; /* Fall through. */ case '+': s++; } if (ISDIGIT (*s)) s = parse_varying (s, &n); else if (s == s0) n = 1; else return 0; if (negative) n = -n; while (! ISALNUM ((unsigned char) *s) && *s) s++; i = lookup (s, relative_units); if (!TM_DEFINED (i)) return 0; * (int *) ((char *) &t->tmr + RELATIVE_OFFSET (i)) += n * RELATIVE_MULTIPLIER (i); while (ISALPHA ((unsigned char) *s)) s++; while (! ISALNUM ((unsigned char) *s) && *s) s++; if (TM_DEFINED (lookup (s, ago))) { t->tmr.tm_sec = - t->tmr.tm_sec; t->tmr.tm_min = - t->tmr.tm_min; t->tmr.tm_hour = - t->tmr.tm_hour; t->tmr.tm_mday = - t->tmr.tm_mday; t->tmr.tm_mon = - t->tmr.tm_mon; t->tmr.tm_year = - t->tmr.tm_year; while (ISALPHA ((unsigned char) *s)) s++; } break; } case 'w': /* 'W' or 'w' only (stands for current week) */ switch (*s++) { case 'W': case 'w': break; default: return 0; } break; case 'W': /* 'W' or 'w', followed by a week of year [00-53] */ switch (*s++) { case 'W': case 'w': break; default: return 0; } s = parse_ranged (s, 2, 0, 53, &t->yweek); break; case 'X': /* weekday (1=Mon ... 7=Sun) [1-7] */ s = parse_ranged (s, 1, 1, 7, &t->tm.tm_wday); t->tm.tm_wday--; break; case 'x': /* weekday name [e.g. "Sun"] */ if (! TM_DEFINED (t->tm.tm_wday = lookup (s, weekday_names))) return 0; /* Don't bother to check rest of spelling. */ while (ISALPHA ((unsigned char) *s)) s++; break; case 'y': /* either R or Y */ if (ISDIGIT (s[0]) && ISDIGIT (s[1]) && ! ISDIGIT (s[2])) goto case_R; /* fall into */ case 'Y': /* year in full [4 or more digits] */ s = parse_varying (s, &t->tm.tm_year); if (s - s0 < 4) return 0; break; case 'Z': /* time zone */ s = parzone (s, &t->zone); break; case '_': /* possibly empty sequence of non-alphanumerics */ while (! ISALNUM ((unsigned char) *s) && *s) s++; break; default: /* bad pattern */ return 0; } return s; } /* If there is no conflict, merge into *T the additional information in *U and return 0. Otherwise do nothing and return -1. */ static int merge_partime (t, u) struct partime *t; struct partime const *u; { # define conflict(a,b) ((a) != (b) && TM_DEFINED (a) && TM_DEFINED (b)) if (conflict (t->tm.tm_sec, u->tm.tm_sec) || conflict (t->tm.tm_min, u->tm.tm_min) || conflict (t->tm.tm_hour, u->tm.tm_hour) || conflict (t->tm.tm_mday, u->tm.tm_mday) || conflict (t->tm.tm_mon, u->tm.tm_mon) || conflict (t->tm.tm_year, u->tm.tm_year) || conflict (t->tm.tm_wday, u->tm.tm_wday) || conflict (t->tm.tm_yday, u->tm.tm_yday) || conflict (t->ymodulus, u->ymodulus) || conflict (t->yweek, u->yweek) || (t->zone != u->zone && t->zone != TM_UNDEFINED_ZONE && u->zone != TM_UNDEFINED_ZONE)) return -1; # undef conflict # define merge_(a,b) if (TM_DEFINED (b)) (a) = (b); merge_ (t->tm.tm_sec, u->tm.tm_sec) merge_ (t->tm.tm_min, u->tm.tm_min) merge_ (t->tm.tm_hour, u->tm.tm_hour) merge_ (t->tm.tm_mday, u->tm.tm_mday) merge_ (t->tm.tm_mon, u->tm.tm_mon) merge_ (t->tm.tm_year, u->tm.tm_year) merge_ (t->tm.tm_wday, u->tm.tm_wday) merge_ (t->tm.tm_yday, u->tm.tm_yday) merge_ (t->ymodulus, u->ymodulus) merge_ (t->yweek, u->yweek) # undef merge_ t->tmr.tm_sec += u->tmr.tm_sec; t->tmr.tm_min += u->tmr.tm_min; t->tmr.tm_hour += u->tmr.tm_hour; t->tmr.tm_mday += u->tmr.tm_mday; t->tmr.tm_mon += u->tmr.tm_mon; t->tmr.tm_year += u->tmr.tm_year; if (u->zone != TM_UNDEFINED_ZONE) t->zone = u->zone; return 0; } /* Parse a date/time prefix of S, putting the parsed result into *T. Return the first character after the prefix. The prefix may contain no useful information; in that case, *T will contain only undefined values. */ char * partime (s, t) char const *s; struct partime *t; { struct partime p; undefine (t); while (*s) { char const *patterns = time_patterns; char const *s1; do { if (! (s1 = parse_prefix (s, &patterns, &p))) return (char *) s; } while (merge_partime (t, &p) != 0); s = s1; } return (char *) s; }