X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fstrftime.c;h=fc3d0c79f2929d8cbb1d466a293ae6f6ce6da412;hb=40e284d3f1e643410c06559522183b1c4eff1030;hp=711529e72b3418a0a12caa23823bd83cfa733ff0;hpb=2670a4641c76533dfb93502bbcddce8d1062435b;p=gnulib.git diff --git a/lib/strftime.c b/lib/strftime.c index 711529e72..fc3d0c79f 100644 --- a/lib/strftime.c +++ b/lib/strftime.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc. +/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc. NOTE: The canonical source of this file is maintained with the GNU C Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. @@ -10,8 +10,8 @@ This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software @@ -91,6 +91,14 @@ extern char *tzname[]; # endif #endif +#ifdef _LIBC +# define MEMPCPY(d, s, n) __mempcpy (d, s, n) +#else +# ifndef HAVE_MEMPCPY +# define MEMPCPY(d, s, n) ((void *) ((char *) memcpy (d, s, n) + (n))) +# endif +#endif + #ifndef __P # if defined (__GNUC__) || (defined (__STDC__) && __STDC__) # define __P(args) args @@ -123,7 +131,7 @@ extern char *tzname[]; add one for integer division truncation; add one more for a minus sign if t is signed. */ #define INT_STRLEN_BOUND(t) \ - ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 100 + 1 + TYPE_SIGNED (t)) + ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 + 1 + TYPE_SIGNED (t)) #define TM_YEAR_BASE 1900 @@ -136,21 +144,20 @@ extern char *tzname[]; #ifdef _LIBC -# define gmtime_r __gmtime_r -# define localtime_r __localtime_r +# define my_strftime_gmtime_r __gmtime_r +# define my_strftime_localtime_r __localtime_r # define tzname __tzname # define tzset __tzset #else -# if ! HAVE_LOCALTIME_R -# if ! HAVE_TM_GMTOFF -/* Approximate gmtime_r as best we can in its absence. */ -# undef gmtime_r -# define gmtime_r my_gmtime_r -static struct tm *gmtime_r __P ((const time_t *, struct tm *)); + +/* If we're a strftime substitute in a GNU program, then prefer gmtime + to gmtime_r, since many gmtime_r implementations are buggy. + Similarly for localtime_r. */ + +# if ! HAVE_TM_GMTOFF +static struct tm *my_strftime_gmtime_r __P ((const time_t *, struct tm *)); static struct tm * -gmtime_r (t, tp) - const time_t *t; - struct tm *tp; +my_strftime_gmtime_r (const time_t *t, struct tm *tp) { struct tm *l = gmtime (t); if (! l) @@ -158,16 +165,11 @@ gmtime_r (t, tp) *tp = *l; return tp; } -# endif /* ! HAVE_TM_GMTOFF */ +# endif /* ! HAVE_TM_GMTOFF */ -/* Approximate localtime_r as best we can in its absence. */ -# undef localtime_r -# define localtime_r my_ftime_localtime_r -static struct tm *localtime_r __P ((const time_t *, struct tm *)); +static struct tm *my_strftime_localtime_r __P ((const time_t *, struct tm *)); static struct tm * -localtime_r (t, tp) - const time_t *t; - struct tm *tp; +my_strftime_localtime_r (const time_t *t, struct tm *tp) { struct tm *l = localtime (t); if (! l) @@ -175,8 +177,7 @@ localtime_r (t, tp) *tp = *l; return tp; } -# endif /* ! HAVE_LOCALTIME_R */ -#endif /* ! defined (_LIBC) */ +#endif /* ! defined _LIBC */ #if !defined memset && !defined HAVE_MEMSET && !defined _LIBC @@ -196,8 +197,7 @@ static const char zeroes[16] = /* "0000000000000000" */ do \ { \ int _this = _len > 16 ? 16 : _len; \ - memcpy ((P), spaces, _this); \ - (P) += _this; \ + (P) = MEMPCPY ((P), spaces, _this); \ _len -= _this; \ } \ while (_len > 0); \ @@ -210,8 +210,7 @@ static const char zeroes[16] = /* "0000000000000000" */ do \ { \ int _this = _len > 16 ? 16 : _len; \ - memcpy ((P), zeroes, _this); \ - (P) += _this; \ + (P) = MEMPCPY ((P), zeroes, _this); \ _len -= _this; \ } \ while (_len > 0); \ @@ -271,26 +270,20 @@ static const char zeroes[16] = /* "0000000000000000" */ static char *memcpy_lowcase __P ((char *dest, const char *src, size_t len)); static char * -memcpy_lowcase (dest, src, len) - char *dest; - const char *src; - size_t len; +memcpy_lowcase (char *dest, const char *src, size_t len) { while (len-- > 0) - dest[len] = TOLOWER (src[len]); + dest[len] = TOLOWER ((unsigned char) src[len]); return dest; } static char *memcpy_uppcase __P ((char *dest, const char *src, size_t len)); static char * -memcpy_uppcase (dest, src, len) - char *dest; - const char *src; - size_t len; +memcpy_uppcase (char *dest, const char *src, size_t len) { while (len-- > 0) - dest[len] = TOUPPER (src[len]); + dest[len] = TOUPPER ((unsigned char) src[len]); return dest; } @@ -301,9 +294,7 @@ memcpy_uppcase (dest, src, len) # define tm_diff ftime_tm_diff static int tm_diff __P ((const struct tm *, const struct tm *)); static int -tm_diff (a, b) - const struct tm *a; - const struct tm *b; +tm_diff (const struct tm *a, const struct tm *b) { /* Compute intervening leap days correctly even if year is negative. Take care to avoid int overflow in leap day calculations, @@ -338,9 +329,7 @@ static int iso_week_days __P ((int, int)); __inline__ #endif static int -iso_week_days (yday, wday) - int yday; - int wday; +iso_week_days (int yday, int wday) { /* Add enough to the first operand of % to make it nonnegative. */ int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7; @@ -350,7 +339,7 @@ iso_week_days (yday, wday) } -#ifndef _NL_CURRENT +#if !(defined _NL_CURRENT || HAVE_STRFTIME) static char const weekday_name[][10] = { "Sunday", "Monday", "Tuesday", "Wednesday", @@ -364,26 +353,39 @@ static char const month_name[][10] = #endif +#ifdef emacs +# define my_strftime emacs_strftimeu +# define ut_argument , ut +# define ut_argument_spec int ut; +# define ut_argument_spec_iso , int ut +#else +# define my_strftime strftime +# define ut_argument +# define ut_argument_spec +# define ut_argument_spec_iso +/* We don't have this information in general. */ +# define ut 0 +#endif + #if !defined _LIBC && HAVE_TZNAME && HAVE_TZSET /* Solaris 2.5 tzset sometimes modifies the storage returned by localtime. Work around this bug by copying *tp before it might be munged. */ size_t _strftime_copytm __P ((char *, size_t, const char *, - const struct tm *)); + const struct tm * ut_argument_spec_iso)); size_t - strftime (s, maxsize, format, tp) + my_strftime (s, maxsize, format, tp ut_argument) char *s; size_t maxsize; const char *format; const struct tm *tp; + ut_argument_spec { struct tm tmcopy; tmcopy = *tp; - return _strftime_copytm (s, maxsize, format, &tmcopy); + return _strftime_copytm (s, maxsize, format, &tmcopy ut_argument); } -# ifdef strftime -# undef strftime -# endif -# define strftime(S, Maxsize, Format, Tp) \ +# undef my_strftime +# define my_strftime(S, Maxsize, Format, Tp) \ _strftime_copytm (S, Maxsize, Format, Tp) #endif @@ -395,37 +397,40 @@ static char const month_name[][10] = anywhere, so to determine how many characters would be written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */ size_t -strftime (s, maxsize, format, tp) - char *s; - size_t maxsize; - const char *format; - const struct tm *tp; +my_strftime (char *s, size_t maxsize, const char *format, const struct tm *tp + ut_argument_spec) { int hour12 = tp->tm_hour; #ifdef _NL_CURRENT - const char *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday); - const char *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday); - const char *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon); - const char *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon); - const char *const ampm = _NL_CURRENT (LC_TIME, - hour12 > 11 ? PM_STR : AM_STR); - size_t aw_len = strlen (a_wkday); - size_t am_len = strlen (a_month); - size_t ap_len = strlen (ampm); + /* We cannot make the following values variables since we must delay + the evaluation of these values until really needed since some + expressions might not be valid in every situation. The `struct tm' + might be generated by a strptime() call that initialized + only a few elements. Dereference the pointers only if the format + requires this. Then it is ok to fail if the pointers are invalid. */ +# define a_wkday _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday) +# define f_wkday _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday) +# define a_month _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon) +# define f_month _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon) +# define ampm _NL_CURRENT (LC_TIME, tp->tm_hour > 11 ? PM_STR : AM_STR) + +# define aw_len strlen (a_wkday) +# define am_len strlen (a_month) +# define ap_len strlen (ampm) #else - const char *const f_wkday = weekday_name[tp->tm_wday]; - const char *const f_month = month_name[tp->tm_mon]; - const char *const a_wkday = f_wkday; - const char *const a_month = f_month; - const char *const ampm = "AMPM" + 2 * (hour12 > 11); +# if !HAVE_STRFTIME +# define f_wkday (weekday_name[tp->tm_wday]) +# define f_month (month_name[tp->tm_mon]) +# define a_wkday f_wkday +# define a_month f_month +# define ampm ("AMPM" + 2 * (tp->tm_hour > 11)) + size_t aw_len = 3; size_t am_len = 3; size_t ap_len = 2; +# endif #endif - size_t wkday_len = strlen (f_wkday); - size_t month_len = strlen (f_month); const char *zone; - size_t zonelen; size_t i = 0; char *p = s; const char *f; @@ -441,29 +446,31 @@ strftime (s, maxsize, format, tp) zone = (const char *) tp->tm_zone; #endif #if HAVE_TZNAME - /* POSIX.1 8.1.1 requires that whenever strftime() is called, the - time zone names contained in the external variable `tzname' shall - be set as if the tzset() function had been called. */ + if (ut) + { + if (! (zone && *zone)) + zone = "GMT"; + } + else + { + /* POSIX.1 8.1.1 requires that whenever strftime() is called, the + time zone names contained in the external variable `tzname' shall + be set as if the tzset() function had been called. */ # if HAVE_TZSET - tzset (); + tzset (); # endif - - if (!(zone && *zone) && tp->tm_isdst >= 0) - zone = tzname[tp->tm_isdst]; + } #endif - if (! zone) - zone = ""; /* POSIX.2 requires the empty string here. */ - - zonelen = strlen (zone); if (hour12 > 12) hour12 -= 12; else - if (hour12 == 0) hour12 = 12; + if (hour12 == 0) + hour12 = 12; for (f = format; *f != '\0'; ++f) { - int pad; /* Padding for number ('-', '_', or 0). */ + int pad = 0; /* Padding for number ('-', '_', or 0). */ int modifier; /* Field modifier ('E', 'O', or 0). */ int digits; /* Max digits for numeric format. */ int number_value; /* Numeric value to be printed. */ @@ -477,6 +484,7 @@ strftime (s, maxsize, format, tp) int to_lowcase = 0; int to_uppcase = 0; int change_case = 0; + int format_char; #if DO_MULTIBYTE @@ -524,7 +532,13 @@ strftime (s, maxsize, format, tp) if (bytes == 0) break; - if (bytes == (size_t) -2 || bytes == (size_t) -1) + if (bytes == (size_t) -2) + { + len += strlen (f + len); + break; + } + + if (bytes == (size_t) -1) { len++; break; @@ -535,6 +549,7 @@ strftime (s, maxsize, format, tp) while (! mbsinit (&mbstate)); cpy (len, f); + f += len - 1; continue; } } @@ -552,7 +567,6 @@ strftime (s, maxsize, format, tp) #endif /* ! DO_MULTIBYTE */ /* Check for flags that can modify a format. */ - pad = 0; while (1) { switch (*++f) @@ -605,7 +619,8 @@ strftime (s, maxsize, format, tp) } /* Now do the specified format. */ - switch (*f) + format_char = *f; + switch (format_char) { #define DO_NUMBER(d, v) \ digits = width == -1 ? d : width; \ @@ -628,8 +643,12 @@ strftime (s, maxsize, format, tp) to_uppcase = 1; to_lowcase = 0; } +#if defined _NL_CURRENT || !HAVE_STRFTIME cpy (aw_len, a_wkday); break; +#else + goto underlying_strftime; +#endif case 'A': if (modifier != 0) @@ -639,15 +658,23 @@ strftime (s, maxsize, format, tp) to_uppcase = 1; to_lowcase = 0; } - cpy (wkday_len, f_wkday); +#if defined _NL_CURRENT || !HAVE_STRFTIME + cpy (strlen (f_wkday), f_wkday); break; +#else + goto underlying_strftime; +#endif case 'b': case 'h': /* POSIX.2 extension. */ if (modifier != 0) goto bad_format; +#if defined _NL_CURRENT || !HAVE_STRFTIME cpy (am_len, a_month); break; +#else + goto underlying_strftime; +#endif case 'B': if (modifier != 0) @@ -657,8 +684,12 @@ strftime (s, maxsize, format, tp) to_uppcase = 1; to_lowcase = 0; } - cpy (month_len, f_month); +#if defined _NL_CURRENT || !HAVE_STRFTIME + cpy (strlen (f_month), f_month); break; +#else + goto underlying_strftime; +#endif case 'c': if (modifier == 'O') @@ -668,32 +699,56 @@ strftime (s, maxsize, format, tp) && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT)) != '\0')) subfmt = _NL_CURRENT (LC_TIME, D_T_FMT); #else +# if HAVE_STRFTIME + goto underlying_strftime; +# else subfmt = "%a %b %e %H:%M:%S %Y"; +# endif #endif subformat: { char *old_start = p; - size_t len = strftime (NULL, maxsize - i, subfmt, tp); - if (len == 0 && *subfmt) - return 0; - add (len, strftime (p, maxsize - i, subfmt, tp)); + size_t len = my_strftime (NULL, (size_t) -1, subfmt, tp); + add (len, my_strftime (p, maxsize - i, subfmt, tp)); if (to_uppcase) while (old_start < p) { - *old_start = TOUPPER (*old_start); + *old_start = TOUPPER ((unsigned char) *old_start); ++old_start; } } break; +#if HAVE_STRFTIME && ! (defined _NL_CURRENT && HAVE_STRUCT_ERA_ENTRY) + underlying_strftime: + { + /* The relevant information is available only via the + underlying strftime implementation, so use that. */ + char ufmt[4]; + char *u = ufmt; + char ubuf[1024]; /* enough for any single format in practice */ + size_t len; + *u++ = '%'; + if (modifier != 0) + *u++ = modifier; + *u++ = format_char; + *u = '\0'; + len = strftime (ubuf, sizeof ubuf, ufmt, tp); + if (len == 0 && ubuf[0] != '\0') + return 0; + cpy (len, ubuf); + } + break; +#endif + case 'C': /* POSIX.2 extension. */ if (modifier == 'O') goto bad_format; -#if HAVE_STRUCT_ERA_ENTRY if (modifier == 'E') { +#if HAVE_STRUCT_ERA_ENTRY struct era_entry *era = _nl_get_era_entry (tp); if (era) { @@ -701,8 +756,13 @@ strftime (s, maxsize, format, tp) cpy (len, era->name_fmt); break; } - } +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# endif #endif + } + { int year = tp->tm_year + TM_YEAR_BASE; DO_NUMBER (1, year / 100 - (year % 100 < 0)); @@ -716,8 +776,13 @@ strftime (s, maxsize, format, tp) && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT)) != '\0')) subfmt = _NL_CURRENT (LC_TIME, D_FMT); goto subformat; -#endif +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# else /* Fall through. */ +# endif +#endif case 'D': /* POSIX.2 extension. */ if (modifier != 0) goto bad_format; @@ -747,9 +812,9 @@ strftime (s, maxsize, format, tp) do_number: /* Format the number according to the MODIFIER flag. */ -#ifdef _NL_CURRENT if (modifier == 'O' && 0 <= number_value) { +#ifdef _NL_CURRENT /* Get the locale specific alternate representation of the number NUMBER_VALUE. If none exist NULL is returned. */ const char *cp = _nl_get_alt_digit (number_value); @@ -763,8 +828,12 @@ strftime (s, maxsize, format, tp) break; } } - } +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# endif #endif + } { unsigned int u = number_value; @@ -805,6 +874,11 @@ strftime (s, maxsize, format, tp) cpy (buf + sizeof (buf) - bufp, bufp); break; + case 'F': + if (modifier != 0) + goto bad_format; + subfmt = "%Y-%m-%d"; + goto subformat; case 'H': if (modifier == 'E') @@ -854,6 +928,9 @@ strftime (s, maxsize, format, tp) case 'P': to_lowcase = 1; +#if !defined _NL_CURRENT && HAVE_STRFTIME + format_char = 'p'; +#endif /* FALLTHROUGH */ case 'p': @@ -862,8 +939,12 @@ strftime (s, maxsize, format, tp) to_uppcase = 0; to_lowcase = 1; } +#if defined _NL_CURRENT || !HAVE_STRFTIME cpy (ap_len, ampm); break; +#else + goto underlying_strftime; +#endif case 'R': /* GNU extension. */ subfmt = "%H:%M"; @@ -929,8 +1010,13 @@ strftime (s, maxsize, format, tp) && *(subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT)) != '\0')) subfmt = _NL_CURRENT (LC_TIME, T_FMT); goto subformat; -#endif +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# else /* Fall through. */ +# endif +#endif case 'T': /* POSIX.2 extension. */ subfmt = "%H:%M:%S"; goto subformat; @@ -1002,26 +1088,30 @@ strftime (s, maxsize, format, tp) DO_NUMBER (1, tp->tm_wday); case 'Y': -#if HAVE_STRUCT_ERA_ENTRY if (modifier == 'E') { +#if HAVE_STRUCT_ERA_ENTRY struct era_entry *era = _nl_get_era_entry (tp); if (era) { subfmt = strchr (era->name_fmt, '\0') + 1; goto subformat; } - } +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# endif #endif + } if (modifier == 'O') goto bad_format; else DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE); case 'y': -#if HAVE_STRUCT_ERA_ENTRY if (modifier == 'E') { +#if HAVE_STRUCT_ERA_ENTRY struct era_entry *era = _nl_get_era_entry (tp); if (era) { @@ -1029,8 +1119,12 @@ strftime (s, maxsize, format, tp) DO_NUMBER (1, (era->offset + (era->direction == '-' ? -delta : delta))); } - } +#else +# if HAVE_STRFTIME + goto underlying_strftime; +# endif #endif + } DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100); case 'Z': @@ -1039,7 +1133,16 @@ strftime (s, maxsize, format, tp) to_uppcase = 0; to_lowcase = 1; } - cpy (zonelen, zone); + +#if HAVE_TZNAME + /* The tzset() call might have changed the value. */ + if (!(zone && *zone) && tp->tm_isdst >= 0) + zone = tzname[tp->tm_isdst]; +#endif + if (! zone) + zone = ""; /* POSIX.2 requires the empty string here. */ + + cpy (strlen (zone), zone); break; case 'z': /* GNU extension. */ @@ -1051,34 +1154,39 @@ strftime (s, maxsize, format, tp) #if HAVE_TM_GMTOFF diff = tp->tm_gmtoff; #else - struct tm gtm; - struct tm ltm; - time_t lt; + if (ut) + diff = 0; + else + { + struct tm gtm; + struct tm ltm; + time_t lt; - ltm = *tp; - lt = mktime (<m); + ltm = *tp; + lt = mktime (<m); - if (lt == (time_t) -1) - { - /* mktime returns -1 for errors, but -1 is also a - valid time_t value. Check whether an error really - occurred. */ - struct tm tm; - localtime_r (<, &tm); - - if ((ltm.tm_sec ^ tm.tm_sec) - | (ltm.tm_min ^ tm.tm_min) - | (ltm.tm_hour ^ tm.tm_hour) - | (ltm.tm_mday ^ tm.tm_mday) - | (ltm.tm_mon ^ tm.tm_mon) - | (ltm.tm_year ^ tm.tm_year)) - break; - } + if (lt == (time_t) -1) + { + /* mktime returns -1 for errors, but -1 is also a + valid time_t value. Check whether an error really + occurred. */ + struct tm tm; + + if (! my_strftime_localtime_r (<, &tm) + || ((ltm.tm_sec ^ tm.tm_sec) + | (ltm.tm_min ^ tm.tm_min) + | (ltm.tm_hour ^ tm.tm_hour) + | (ltm.tm_mday ^ tm.tm_mday) + | (ltm.tm_mon ^ tm.tm_mon) + | (ltm.tm_year ^ tm.tm_year))) + break; + } - if (! gmtime_r (<, >m)) - break; + if (! my_strftime_gmtime_r (<, >m)) + break; - diff = tm_diff (<m, >m); + diff = tm_diff (<m, >m); + } #endif if (diff < 0) @@ -1111,7 +1219,23 @@ strftime (s, maxsize, format, tp) } } - if (p) + if (p && maxsize != 0) *p = '\0'; return i; } + + +#ifdef emacs +/* For Emacs we have a separate interface which corresponds to the normal + strftime function and does not have the extra information whether the + TP arguments comes from a `gmtime' call or not. */ +size_t +emacs_strftime (s, maxsize, format, tp) + char *s; + size_t maxsize; + const char *format; + const struct tm *tp; +{ + return my_strftime (s, maxsize, format, tp, 0); +} +#endif