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Diffstat (limited to 'compat/strftime.c')
| -rw-r--r-- | compat/strftime.c | 1049 |
1 files changed, 1049 insertions, 0 deletions
diff --git a/compat/strftime.c b/compat/strftime.c new file mode 100644 index 0000000..400ad52 --- /dev/null +++ b/compat/strftime.c @@ -0,0 +1,1049 @@ +/* + 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. + + This program 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. + + 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. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + + */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#ifdef _LIBC +# define HAVE_LIMITS_H 1 +# define HAVE_MBLEN 1 +# define HAVE_MBRLEN 1 +# define HAVE_STRUCT_ERA_ENTRY 1 +# define HAVE_TM_GMTOFF 1 +# define HAVE_TM_ZONE 1 +# define HAVE_TZNAME 1 +# define HAVE_TZSET 1 +# define MULTIBYTE_IS_FORMAT_SAFE 1 +# define STDC_HEADERS 1 +# include <ansidecl.h> +# include "../locale/localeinfo.h" +#endif + +#include <ctype.h> +#include <sys/types.h> /* Some systems define `time_t' here. */ + +#ifdef TIME_WITH_SYS_TIME +# include <sys/time.h> +# include <time.h> +#else +# ifdef HAVE_SYS_TIME_H +# include <sys/time.h> +# else +# include <time.h> +# endif +#endif +#if HAVE_TZNAME +extern char *tzname[]; +#endif + +/* Do multibyte processing if multibytes are supported, unless + multibyte sequences are safe in formats. Multibyte sequences are + safe if they cannot contain byte sequences that look like format + conversion specifications. The GNU C Library uses UTF8 multibyte + encoding, which is safe for formats, but strftime.c can be used + with other C libraries that use unsafe encodings. */ +#define DO_MULTIBYTE (HAVE_MBLEN && ! MULTIBYTE_IS_FORMAT_SAFE) + +#if DO_MULTIBYTE +# if HAVE_MBRLEN +# include <wchar.h> +# else + /* Simulate mbrlen with mblen as best we can. */ +# define mbstate_t int +# define mbrlen(s, n, ps) mblen (s, n) +# define mbsinit(ps) (*(ps) == 0) +# endif + static const mbstate_t mbstate_zero; +#endif + +#if HAVE_LIMITS_H +# include <limits.h> +#endif + +#if STDC_HEADERS +# include <stddef.h> +# include <stdlib.h> +# include <string.h> +#else +# define memcpy(d, s, n) bcopy ((s), (d), (n)) +#endif + +#ifndef __P +# if defined (__GNUC__) || (defined (__STDC__) && __STDC__) +# define __P(args) args +# else +# define __P(args) () +# endif /* GCC. */ +#endif /* Not __P. */ + +#ifndef PTR +# ifdef __STDC__ +# define PTR void * +# else +# define PTR char * +# endif +#endif + +#ifndef CHAR_BIT +# define CHAR_BIT 8 +#endif + +#ifndef NULL +# define NULL 0 +#endif + +#define TYPE_SIGNED(t) ((t) -1 < 0) + +/* Bound on length of the string representing an integer value of type t. + Subtract one for the sign bit if t is signed; + 302 / 1000 is log10 (2) rounded up; + 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)) + +#define TM_YEAR_BASE 1900 + +#ifndef __isleap +/* Nonzero if YEAR is a leap year (every 4 years, + except every 100th isn't, and every 400th is). */ +# define __isleap(year) \ + ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) +#endif + + +#ifdef _LIBC +# define gmtime_r __gmtime_r +# define localtime_r __localtime_r +extern int __tz_compute __P ((time_t timer, const struct tm *tm)); +# 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. */ +# define gmtime_r my_gmtime_r +static struct tm *gmtime_r __P ((const time_t *, struct tm *)); +static struct tm * +gmtime_r (const time_t *t, struct tm *tp) +{ + struct tm *l = gmtime (t); + if (! l) + return 0; + *tp = *l; + return tp; +} +# endif /* ! HAVE_TM_GMTOFF */ + +/* Approximate localtime_r as best we can in its absence. */ +# define localtime_r my_localtime_r +static struct tm *localtime_r __P ((const time_t *, struct tm *)); +static struct tm * +localtime_r (const time_t *t, struct tm *tp) +{ + struct tm *l = localtime (t); + if (! l) + return 0; + *tp = *l; + return tp; +} +# endif /* ! HAVE_LOCALTIME_R */ +#endif /* ! defined (_LIBC) */ + + +#if !defined (memset) && !HAVE_MEMSET && !_LIBC +/* Some systems lack the `memset' function and we don't want to + introduce additional dependencies. */ +static char const spaces[16] = " "; + +# define memset_space(P, Len) \ + do { \ + int _len = (Len); \ + \ + do \ + { \ + int _this = _len > 16 ? 16 : _len; \ + memcpy ((P), spaces, (size_t) _this); \ + (P) += _this; \ + _len -= _this; \ + } \ + while (_len > 0); \ + } while (false) +#else +# define memset_space(P, Len) memset ((P), ' ', (size_t) (Len)) +#endif + +#define add(n, f) \ + do \ + { \ + int _n = (n); \ + int _delta = width - _n; \ + int _incr = _n + (_delta > 0 ? _delta : 0); \ + if (i + _incr >= maxsize) \ + return 0; \ + if (p) \ + { \ + if (_delta > 0) \ + memset_space (p, _delta); \ + f; \ + p += _n; \ + } \ + i += _incr; \ + } while (false) + +#define cpy(n, s) \ + add ((n), \ + if (to_lowcase) \ + memcpy_lowcase (p, (s), (size_t) _n); \ + else if (to_uppcase) \ + memcpy_uppcase (p, (s), (size_t) _n); \ + else \ + memcpy ((PTR) p, (PTR) (s), (size_t) _n)) + + + +#ifdef _LIBC +# define TOUPPER(Ch) toupper (Ch) +# define TOLOWER(Ch) tolower (Ch) +#else +# define TOUPPER(Ch) (islower (Ch) ? toupper (Ch) : (Ch)) +# define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) +#endif +/* We don't use `isdigit' here since the locale dependent + interpretation is not what we want here. We only need to accept + the arabic digits in the ASCII range. One day there is perhaps a + more reliable way to accept other sets of digits. */ +#define ISDIGIT(Ch) ((unsigned int) (Ch) - '0' <= 9) + +static char *memcpy_lowcase __P ((char *dest, char const *src, size_t len)); + +static char * +memcpy_lowcase (char *dest, char const *src, size_t len) +{ + while (len-- > 0) + dest[len] = TOLOWER (src[len]); + return dest; +} + +static char *memcpy_uppcase __P ((char *dest, char const *src, size_t len)); + +static char * +memcpy_uppcase (char *dest, char const *src, size_t len) +{ + while (len-- > 0) + dest[len] = TOUPPER (src[len]); + return dest; +} + +#if ! HAVE_TM_GMTOFF +/* Yield the difference between *A and *B, + measured in seconds, ignoring leap seconds. */ +static int tm_diff __P ((const struct tm *, const struct tm *)); +static int +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, + but it's OK to assume that A and B are close to each other. */ + int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3); + int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3); + int a100 = a4 / 25 - (a4 % 25 < 0); + int b100 = b4 / 25 - (b4 % 25 < 0); + int a400 = a100 >> 2; + int b400 = b100 >> 2; + int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); + int years = a->tm_year - b->tm_year; + int days = (365 * years + intervening_leap_days + + (a->tm_yday - b->tm_yday)); + return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) + + (a->tm_min - b->tm_min)) + + (a->tm_sec - b->tm_sec)); +} +#endif /* ! HAVE_TM_GMTOFF */ + + + +/* The number of days from the first day of the first ISO week of this + year to the year day YDAY with week day WDAY. ISO weeks start on + Monday; the first ISO week has the year's first Thursday. YDAY may + be as small as YDAY_MINIMUM. */ +#define ISO_WEEK_START_WDAY 1 /* Monday */ +#define ISO_WEEK1_WDAY 4 /* Thursday */ +#define YDAY_MINIMUM (-366) +static int iso_week_days __P ((int, int)); +#ifdef __GNUC__ +inline +#endif +static int +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; + return (yday + - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7 + + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY); +} + + +#ifndef _NL_CURRENT +static char const weekday_name[][10] = + { + "Sunday", "Monday", "Tuesday", "Wednesday", + "Thursday", "Friday", "Saturday" + }; +static char const month_name[][10] = + { + "January", "February", "March", "April", "May", "June", + "July", "August", "September", "October", "November", "December" + }; +#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, char const *, + const struct tm *)); + size_t + strftime (s, maxsize, format, tp) + char *s; + size_t maxsize; + char const *format; + const struct tm *tp; + { + struct tm tmcopy; + tmcopy = *tp; + return _strftime_copytm (s, maxsize, format, &tmcopy); +} +# ifdef strftime +# undef strftime +# endif +# define strftime _strftime_copytm +#endif + + + +/* Write information from TP into S according to the format + string FORMAT, writing no more that MAXSIZE characters + (including the terminating '\0') and returning number of + characters written. If S is NULL, nothing will be written + anywhere, so to determine how many characters would be + written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */ +size_t +strftime (char *s, size_t maxsize, char const *format, const struct tm *tp) +{ + int hour12 = tp->tm_hour; +#ifdef _NL_CURRENT + char const *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday); + char const *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday); + char const *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon); + char const *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon); + char const *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); +#else + char const *const f_wkday = weekday_name[tp->tm_wday]; + char const *const f_month = month_name[tp->tm_mon]; + char const *const a_wkday = f_wkday; + char const *const a_month = f_month; + char const *const ampm = "AMPM" + 2 * (hour12 > 11); + size_t aw_len = 3; + size_t am_len = 3; + size_t ap_len = 2; +#endif + size_t wkday_len = strlen (f_wkday); + size_t month_len = strlen (f_month); + char const *zone; + size_t zonelen; + size_t i = 0; + char *p = s; + char const *f; + + zone = NULL; +#if !defined _LIBC && HAVE_TM_ZONE + /* XXX We have some problems here. First, the string pointed to by + tm_zone is dynamically allocated while loading the zone data. But + when another zone is loaded since the information in TP were + computed this would be a stale pointer. + The second problem is the POSIX test suite which assumes setting + the environment variable TZ to a new value before calling strftime() + will influence the result (the %Z format) even if the information in + TP is computed with a totally different time zone. --drepper@gnu */ + zone = (char const *) 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 HAVE_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; + + for (f = format; *f != '\0'; ++f) + { + int pad; /* 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. */ + int negative_number; /* 1 if the number is negative. */ + char const *subfmt; + char *bufp; + char buf[1 + (sizeof (int) < sizeof (time_t) + ? INT_STRLEN_BOUND (time_t) + : INT_STRLEN_BOUND (int))]; + int width = -1; + int to_lowcase = 0; + int to_uppcase = 0; + +#if DO_MULTIBYTE + + switch (*f) + { + case '%': + break; + +#if __STDC__ + case '\a': +#else + case 7: /* '\a' is ASCII decimal value 7. */ +#endif + case '\b': case '\t': case '\n': + case '\v': case '\f': case '\r': + case ' ': case '!': case '"': case '#': case '&': case'\'': + case '(': case ')': case '*': case '+': case ',': case '-': + case '.': case '/': case '0': case '1': case '2': case '3': + case '4': case '5': case '6': case '7': case '8': case '9': + case ':': case ';': case '<': case '=': case '>': case '?': + case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': + case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': + case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': + case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': + case 'Y': case 'Z': case '[': case'\\': case ']': case '^': + case '_': case 'a': case 'b': case 'c': case 'd': case 'e': + case 'f': case 'g': case 'h': case 'i': case 'j': case 'k': + case 'l': case 'm': case 'n': case 'o': case 'p': case 'q': + case 'r': case 's': case 't': case 'u': case 'v': case 'w': + case 'x': case 'y': case 'z': case '{': case '|': case '}': + case '~': + /* The C Standard requires these 98 characters (plus '%') to + be in the basic execution character set. None of these + characters can start a multibyte sequence, so they need + not be analyzed further. */ + add (1, *p = *f); + continue; + + default: + /* Copy this multibyte sequence until we reach its end, find + an error, or come back to the initial shift state. */ + { + mbstate_t mbstate = mbstate_zero; + size_t len = 0; + + do + { + size_t bytes = mbrlen (f + len, (size_t) -1, &mbstate); + + if (bytes == 0) + break; + + if (bytes == (size_t) -2 || bytes == (size_t) -1) + { + len++; + break; + } + + len += bytes; + } + while (! mbsinit (&mbstate)); + + cpy (len, f); + continue; + } + } + +#else /* ! DO_MULTIBYTE */ + + /* Either multibyte encodings are not supported, or they are + safe for formats, so any non-'%' byte can be copied through. */ + if (*f != '%') + { + add (1, *p = *f); + continue; + } + +#endif /* ! DO_MULTIBYTE */ + + /* Check for flags that can modify a format. */ + pad = 0; + while (1) + { + switch (*++f) + { + /* This influences the number formats. */ + case '_': + case '-': + case '0': + pad = *f; + continue; + + /* This changes textual output. */ + case '^': + to_uppcase = 1; + continue; + + default: + break; + } + break; + } + + /* As a GNU extension we allow to specify the field width. */ + if (ISDIGIT (*f)) + { + width = 0; + do + { + width *= 10; + width += *f - '0'; + ++f; + } + while (ISDIGIT (*f)); + } + + /* Check for modifiers. */ + switch (*f) + { + case 'E': + case 'O': + modifier = *f++; + break; + + default: + modifier = 0; + break; + } + + /* Now do the specified format. */ + switch (*f) + { +#define DO_NUMBER(d, v) \ + digits = d; number_value = v; goto do_number +#define DO_NUMBER_SPACEPAD(d, v) \ + digits = d; number_value = v; goto do_number_spacepad + + case '%': + if (modifier != 0) + goto bad_format; + add (1, *p = *f); + break; + + case 'a': + if (modifier != 0) + goto bad_format; + cpy (aw_len, a_wkday); + break; + + case 'A': + if (modifier != 0) + goto bad_format; + cpy (wkday_len, f_wkday); + break; + + case 'b': + case 'h': /* POSIX.2 extension. */ + if (modifier != 0) + goto bad_format; + cpy (am_len, a_month); + break; + + case 'B': + if (modifier != 0) + goto bad_format; + cpy (month_len, f_month); + break; + + case 'c': + if (modifier == 'O') + goto bad_format; +#ifdef _NL_CURRENT + if (! (modifier == 'E' + && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT)) != '\0')) + subfmt = _NL_CURRENT (LC_TIME, D_T_FMT); +#else + subfmt = "%a %b %e %H:%M:%S %Y"; +#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)); + + if (to_uppcase) + while (old_start < p) + { + *old_start = TOUPPER (*old_start); + ++old_start; + } + } + break; + + case 'C': /* POSIX.2 extension. */ + if (modifier == 'O') + goto bad_format; +#if HAVE_STRUCT_ERA_ENTRY + if (modifier == 'E') + { + struct era_entry *era = _nl_get_era_entry (tp); + if (era) + { + size_t len = strlen (era->name_fmt); + cpy (len, era->name_fmt); + break; + } + } +#endif + { + int year = tp->tm_year + TM_YEAR_BASE; + DO_NUMBER (1, year / 100 - (year % 100 < 0)); + } + + case 'x': + if (modifier == 'O') + goto bad_format; +#ifdef _NL_CURRENT + if (! (modifier == 'E' + && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT)) != '\0')) + subfmt = _NL_CURRENT (LC_TIME, D_FMT); + goto subformat; +#endif + /* Fall through. */ + case 'D': /* POSIX.2 extension. */ + if (modifier != 0) + goto bad_format; + subfmt = "%m/%d/%y"; + goto subformat; + + case 'd': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, tp->tm_mday); + + case 'e': /* POSIX.2 extension. */ + if (modifier == 'E') + goto bad_format; + + DO_NUMBER_SPACEPAD (2, tp->tm_mday); + + /* All numeric formats set DIGITS and NUMBER_VALUE and then + jump to one of these two labels. */ + + do_number_spacepad: + /* Force `_' flag unless overwritten by `0' flag. */ + if (pad != '0') + pad = '_'; + + do_number: + /* Format the number according to the MODIFIER flag. */ + +#ifdef _NL_CURRENT + if (modifier == 'O' && 0 <= number_value) + { + /* Get the locale specific alternate representation of + the number NUMBER_VALUE. If none exist NULL is returned. */ + char const *cp = _nl_get_alt_digit (number_value); + + if (cp != NULL) + { + size_t digitlen = strlen (cp); + if (digitlen != 0) + { + cpy (digitlen, cp); + break; + } + } + } +#endif + { + unsigned int u = number_value; + + bufp = buf + sizeof (buf); + negative_number = number_value < 0; + + if (negative_number) + u = -u; + + do + *--bufp = u % 10 + '0'; + while ((u /= 10) != 0); + } + + do_number_sign_and_padding: + if (negative_number) + *--bufp = '-'; + + if (pad != '-') + { + int padding = digits - (buf + sizeof (buf) - bufp); + + if (pad == '_') + { + while (0 < padding--) + *--bufp = ' '; + } + else + { + bufp += negative_number; + while (0 < padding--) + *--bufp = '0'; + if (negative_number) + *--bufp = '-'; + } + } + + cpy (buf + sizeof (buf) - bufp, bufp); + break; + + + case 'H': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, tp->tm_hour); + + case 'I': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, hour12); + + case 'k': /* GNU extension. */ + if (modifier == 'E') + goto bad_format; + + DO_NUMBER_SPACEPAD (2, tp->tm_hour); + + case 'l': /* GNU extension. */ + if (modifier == 'E') + goto bad_format; + + DO_NUMBER_SPACEPAD (2, hour12); + + case 'j': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (3, 1 + tp->tm_yday); + + case 'M': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, tp->tm_min); + + case 'm': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, tp->tm_mon + 1); + + case 'n': /* POSIX.2 extension. */ + add (1, *p = '\n'); + break; + + case 'P': + to_lowcase = 1; + /* FALLTHROUGH */ + + case 'p': + cpy (ap_len, ampm); + break; + + case 'R': /* GNU extension. */ + subfmt = "%H:%M"; + goto subformat; + + case 'r': /* POSIX.2 extension. */ +#ifdef _NL_CURRENT + if (*(subfmt = _NL_CURRENT (LC_TIME, T_FMT_AMPM)) == '\0') +#endif + subfmt = "%I:%M:%S %p"; + goto subformat; + + case 'S': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, tp->tm_sec); + + case 's': /* GNU extension. */ + { + struct tm ltm; + time_t t; + + ltm = *tp; + t = mktime (<m); + + /* Generate string value for T using time_t arithmetic; + this works even if sizeof (long) < sizeof (time_t). */ + + bufp = buf + sizeof (buf); + negative_number = t < 0; + + do + { + int d = t % 10; + t /= 10; + + if (negative_number) + { + d = -d; + + /* Adjust if division truncates to minus infinity. */ + if (0 < -1 % 10 && d < 0) + { + t++; + d += 10; + } + } + + *--bufp = d + '0'; + } + while (t != 0); + + digits = 1; + goto do_number_sign_and_padding; + } + + case 'X': + if (modifier == 'O') + goto bad_format; +#ifdef _NL_CURRENT + if (! (modifier == 'E' + && *(subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT)) != '\0')) + subfmt = _NL_CURRENT (LC_TIME, T_FMT); + goto subformat; +#endif + /* Fall through. */ + case 'T': /* POSIX.2 extension. */ + subfmt = "%H:%M:%S"; + goto subformat; + + case 't': /* POSIX.2 extension. */ + add (1, *p = '\t'); + break; + + case 'u': /* POSIX.2 extension. */ + DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1); + + case 'U': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7); + + case 'V': + case 'g': /* GNU extension. */ + case 'G': /* GNU extension. */ + if (modifier == 'E') + goto bad_format; + { + int year = tp->tm_year + TM_YEAR_BASE; + int days = iso_week_days (tp->tm_yday, tp->tm_wday); + + if (days < 0) + { + /* This ISO week belongs to the previous year. */ + year--; + days = iso_week_days (tp->tm_yday + (365 + __isleap (year)), + tp->tm_wday); + } + else + { + int d = iso_week_days (tp->tm_yday - (365 + __isleap (year)), + tp->tm_wday); + if (0 <= d) + { + /* This ISO week belongs to the next year. */ + year++; + days = d; + } + } + + switch (*f) + { + case 'g': + DO_NUMBER (2, (year % 100 + 100) % 100); + + case 'G': + DO_NUMBER (1, year); + + default: + DO_NUMBER (2, days / 7 + 1); + } + } + + case 'W': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7); + + case 'w': + if (modifier == 'E') + goto bad_format; + + DO_NUMBER (1, tp->tm_wday); + + case 'Y': +#if HAVE_STRUCT_ERA_ENTRY + if (modifier == 'E') + { + struct era_entry *era = _nl_get_era_entry (tp); + if (era) + { + subfmt = strchr (era->name_fmt, '\0') + 1; + goto subformat; + } + } +#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') + { + struct era_entry *era = _nl_get_era_entry (tp); + if (era) + { + int delta = tp->tm_year - era->start_date[0]; + DO_NUMBER (1, (era->offset + + (era->direction == '-' ? -delta : delta))); + } + } +#endif + DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100); + + case 'Z': + cpy (zonelen, zone); + break; + + case 'z': /* GNU extension. */ + if (tp->tm_isdst < 0) + break; + + { + int diff; +#if HAVE_TM_GMTOFF + diff = tp->tm_gmtoff; +#else + struct tm gtm; + struct tm ltm; + time_t lt; + + 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 (! gmtime_r (<, >m)) + break; + + diff = tm_diff (<m, >m); +#endif + + if (diff < 0) + { + add (1, *p = '-'); + diff = -diff; + } + else + add (1, *p = '+'); + + diff /= 60; + DO_NUMBER (4, (diff / 60) * 100 + diff % 60); + } + + case '\0': /* GNU extension: % at end of format. */ + --f; + /* Fall through. */ + default: + /* Unknown format; output the format, including the '%', + since this is most likely the right thing to do if a + multibyte string has been misparsed. */ + bad_format: + { + int flen; + for (flen = 1; f[1 - flen] != '%'; flen++) + continue; + cpy (flen, &f[1 - flen]); + } + break; + } + } + + if (p) + *p = '\0'; + return i; +} + +/* + * Local Variables: + * mode: C + * c-file-style: "stroustrup" + * indent-tabs-mode: nil + * End: + * end of compat/strftime.c */ |