X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fstrftime.c;h=489911f339983f5755f130a7bfb9904078cd9de3;hb=3b3231a029a148f719f3347a4ec9ab11f7625231;hp=cfd41adbee8ba1a6c94d4a570df30e7ff70d3aca;hpb=cd47583be488a600699606197091077ba4cb2c1d;p=gnulib.git diff --git a/lib/strftime.c b/lib/strftime.c index cfd41adbe..489911f33 100644 --- a/lib/strftime.c +++ b/lib/strftime.c @@ -1,10 +1,12 @@ -/* strftime - custom formatting of date and/or time - Copyright (C) 1989, 1991, 1992 Free Software Foundation, Inc. +/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. - 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. + 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 @@ -12,419 +14,874 @@ 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, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -/* Note: this version of strftime lacks locale support, - but it is standalone. - - Performs `%' substitutions similar to those in printf. Except - where noted, substituted fields have a fixed size; numeric fields are - padded if necessary. Padding is with zeros by default; for fields - that display a single number, padding can be changed or inhibited by - following the `%' with one of the modifiers described below. Unknown - field specifiers are copied as normal characters. All other - characters are copied to the output without change. - - Supports a superset of the ANSI C field specifiers. - - Literal character fields: - % % - n newline - t tab - - Numeric modifiers (a nonstandard extension): - - do not pad the field - _ pad the field with spaces - - Time fields: - %H hour (00..23) - %I hour (01..12) - %k hour ( 0..23) - %l hour ( 1..12) - %M minute (00..59) - %p locale's AM or PM - %r time, 12-hour (hh:mm:ss [AP]M) - %R time, 24-hour (hh:mm) - %S second (00..61) - %T time, 24-hour (hh:mm:ss) - %X locale's time representation (%H:%M:%S) - %Z time zone (EDT), or nothing if no time zone is determinable - - Date fields: - %a locale's abbreviated weekday name (Sun..Sat) - %A locale's full weekday name, variable length (Sunday..Saturday) - %b locale's abbreviated month name (Jan..Dec) - %B locale's full month name, variable length (January..December) - %c locale's date and time (Sat Nov 04 12:02:33 EST 1989) - %C century (00..99) - %d day of month (01..31) - %e day of month ( 1..31) - %D date (mm/dd/yy) - %h same as %b - %j day of year (001..366) - %m month (01..12) - %U week number of year with Sunday as first day of week (00..53) - %w day of week (0..6) - %W week number of year with Monday as first day of week (00..53) - %x locale's date representation (mm/dd/yy) - %y last two digits of year (00..99) - %Y year (1970...) - - David MacKenzie */ - -#include -#if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)) -#include -#else -#include + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifdef HAVE_CONFIG_H +# include #endif -#if defined(HAVE_TZNAME) -extern char *tzname[2]; +#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 MULTIBYTE_IS_FORMAT_SAFE 1 +# define STDC_HEADERS 1 +# include +# include "../locale/localeinfo.h" #endif -/* Types of padding for numbers in date and time. */ -enum padding -{ - none, blank, zero -}; +#include /* Some systems define `time_t' here. */ -static char const* const days[] = -{ - "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" -}; +#ifdef TIME_WITH_SYS_TIME +# include +# include +#else +# ifdef HAVE_SYS_TIME_H +# include +# else +# include +# endif +#endif -static char const * const months[] = -{ - "January", "February", "March", "April", "May", "June", - "July", "August", "September", "October", "November", "December" -}; +/* 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 +# 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 -/* Add character C to STRING and increment LENGTH, - unless LENGTH would exceed MAX. */ +#if HAVE_LIMITS_H +# include +#endif -#define add_char(c) \ - do \ - { \ - if (length + 1 <= max) \ - string[length++] = (c); \ - } \ - while (0) +#if STDC_HEADERS +# include +# include +# include +#else +# define memcpy(d, s, n) bcopy (s, d, n) +#endif -/* Add a 2 digit number to STRING, padding if specified. - Return the number of characters added, up to MAX. */ +#ifndef __P +#if defined (__GNUC__) || (defined (__STDC__) && __STDC__) +#define __P(args) args +#else +#define __P(args) () +#endif /* GCC. */ +#endif /* Not __P. */ -static int -add_num2 (string, num, max, pad) - char *string; - int num; - int max; - enum padding pad; -{ - int top = num / 10; - int length = 0; - - if (top == 0 && pad == blank) - add_char (' '); - else if (top != 0 || pad == zero) - add_char (top + '0'); - add_char (num % 10 + '0'); - return length; -} +#ifndef PTR +#ifdef __STDC__ +#define PTR void * +#else +#define PTR char * +#endif +#endif -/* Add a 3 digit number to STRING, padding if specified. - Return the number of characters added, up to MAX. */ +#ifndef CHAR_BIT +#define CHAR_BIT 8 +#endif -static int -add_num3 (string, num, max, pad) - char *string; - int num; - int max; - enum padding pad; -{ - int top = num / 100; - int mid = (num - top * 100) / 10; - int length = 0; - - if (top == 0 && pad == blank) - add_char (' '); - else if (top != 0 || pad == zero) - add_char (top + '0'); - if (mid == 0 && top == 0 && pad == blank) - add_char (' '); - else if (mid != 0 || top != 0 || pad == zero) - add_char (mid + '0'); - add_char (num % 10 + '0'); - return length; -} +#define TYPE_SIGNED(t) ((t) -1 < 0) -/* Like strncpy except return the number of characters copied. */ +/* 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)) -static int -add_str (to, from, max) - char *to; - char *from; - int max; -{ - int i; +#define TM_YEAR_BASE 1900 - for (i = 0; from[i] && i <= max; ++i) - to[i] = from[i]; - return i; -} +#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 -/* Return the week in the year of the time in TM, with the weeks - starting on Sundays. */ +#ifdef _LIBC +# define gmtime_r __gmtime_r +# define localtime_r __localtime_r +#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 (t, tp) + 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 (t, tp) + 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) */ + + +#define add(n, f) \ + do \ + { \ + i += (n); \ + if (i >= maxsize) \ + return 0; \ + else \ + if (p) \ + { \ + f; \ + p += (n); \ + } \ + } while (0) +#define cpy(n, s) add ((n), memcpy((PTR) p, (PTR) (s), (n))) + +#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 -sun_week (tm) - struct tm *tm; +tm_diff (a, b) + const struct tm *a; + const struct tm *b; { - int dl; - - /* Set `dl' to the day in the year of the last day of the week previous - to the one containing the day specified in TM. If the day specified - in TM is in the first week of the year, `dl' will be negative or 0. - Otherwise, calculate the number of complete weeks before our week - (dl / 7) and add any partial week at the start of the year (dl % 7). */ - dl = tm->tm_yday - tm->tm_wday; - return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0); + /* 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 */ + -/* Return the week in the year of the time in TM, with the weeks - starting on Mondays. */ +/* 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 -mon_week (tm) - struct tm *tm; +iso_week_days (yday, wday) + int yday; + int wday; { - int dl, wday; - - if (tm->tm_wday == 0) - wday = 6; - else - wday = tm->tm_wday - 1; - dl = tm->tm_yday - wday; - return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0); + /* 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); } -#if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME) -char * -zone_name (tp) - struct tm *tp; -{ - char *timezone (); - struct timeval tv; - struct timezone tz; - gettimeofday (&tv, &tz); - return timezone (tz.tz_minuteswest, tp->tm_isdst); -} +#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 -/* Format the time given in TM according to FORMAT, and put the - results in STRING. - Return the number of characters (not including terminating null) - that were put into STRING, or 0 if the length would have - exceeded MAX. */ - +/* 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 (string, max, format, tm) - char *string; - size_t max; - const char *format; - const struct tm *tm; +strftime (s, maxsize, format, tp) + char *s; + size_t maxsize; + const char *format; + register const struct tm *tp; { - enum padding pad; /* Type of padding to apply. */ - size_t length = 0; /* Characters put in STRING so far. */ + 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); +#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); + 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); + const char *zone; + size_t zonelen; + register size_t i = 0; + register char *p = s; + register const char *f; + + zone = 0; +#if HAVE_TM_ZONE + zone = (const char *) tp->tm_zone; +#endif +#if HAVE_TZNAME + 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); - for (; *format && length < max; ++format) + if (hour12 > 12) + hour12 -= 12; + else + if (hour12 == 0) hour12 = 12; + + for (f = format; *f != '\0'; ++f) { - if (*format != '%') - add_char (*format); - else + 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. */ + const char *subfmt; + char *bufp; + char buf[1 + (sizeof (int) < sizeof (time_t) + ? INT_STRLEN_BOUND (time_t) + : INT_STRLEN_BOUND (int))]; + +#if DO_MULTIBYTE + + switch (*f) + { + case '%': + break; + + case '\a': 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 != '%') { - ++format; - /* Modifiers: */ - if (*format == '-') + add (1, *p = *f); + continue; + } + +#endif /* ! DO_MULTIBYTE */ + + /* Check for flags that can modify a number format. */ + ++f; + switch (*f) + { + case '_': + case '-': + pad = *f++; + break; + + default: + pad = 0; + break; + } + + /* 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 %Z %Y"; +#endif + + subformat: + { + size_t len = strftime (p, maxsize - i, subfmt, tp); + if (len == 0 && *subfmt) + return 0; + add (len, ;); + } + break; + + case 'C': /* POSIX.2 extension. */ + if (modifier == 'O') + goto bad_format; +#if HAVE_STRUCT_ERA_ENTRY + if (modifier == 'E') { - pad = none; - ++format; + struct era_entry *era = _nl_get_era_entry (tp); + if (era) + { + size_t len = strlen (era->name_fmt); + cpy (len, era->name_fmt); + break; + } } - else if (*format == '_') +#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. */ + pad = '_'; + + do_number: + /* Format the number according to the MODIFIER flag. */ + +#ifdef _NL_CURRENT + if (modifier == 'O' && 0 <= number_value) { - pad = blank; - ++format; + /* 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); + + if (cp != NULL) + { + size_t digitlen = strlen (cp); + if (digitlen != 0) + { + cpy (digitlen, cp); + break; + } + } } - else - pad = zero; +#endif + { + unsigned int u = number_value; + + bufp = buf + sizeof (buf); + negative_number = number_value < 0; + + if (negative_number) + u = -u; - switch (*format) + do + *--bufp = u % 10 + '0'; + while ((u /= 10) != 0); + } + + do_number_sign_and_padding: + if (negative_number) + *--bufp = '-'; + + if (pad != '-') { - /* Literal character fields: */ - case 0: - case '%': - add_char ('%'); - break; - case 'n': - add_char ('\n'); - break; - case 't': - add_char ('\t'); - break; - default: - add_char (*format); - break; + int padding = digits - (buf + sizeof (buf) - bufp); - /* Time fields: */ - case 'H': - case 'k': - length += - add_num2 (&string[length], tm->tm_hour, max - length, - *format == 'H' ? pad : blank); - break; - case 'I': - case 'l': + 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': + 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 hour12; - - if (tm->tm_hour == 0) - hour12 = 12; - else if (tm->tm_hour > 12) - hour12 = tm->tm_hour - 12; - else - hour12 = tm->tm_hour; - length += - add_num2 (&string[length], hour12, max - length, - *format == 'I' ? pad : blank); + 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'; } - break; - case 'M': - length += - add_num2 (&string[length], tm->tm_min, max - length, pad); - break; - case 'p': - if (tm->tm_hour < 12) - add_char ('A'); - else - add_char ('P'); - add_char ('M'); - break; - case 'r': - length += - strftime (&string[length], max - length, "%I:%M:%S %p", tm); - break; - case 'R': - length += - strftime (&string[length], max - length, "%H:%M", tm); - break; - case 'S': - length += - add_num2 (&string[length], tm->tm_sec, max - length, pad); - break; - case 'T': - length += - strftime (&string[length], max - length, "%H:%M:%S", tm); - break; - case 'X': - length += - strftime (&string[length], max - length, "%H:%M:%S", tm); - break; - case 'Z': -#ifdef HAVE_TM_ZONE - length += add_str (&string[length], tm->tm_zone, max - length); -#else -#ifdef HAVE_TZNAME - if (tm->tm_isdst && tzname[1] && *tzname[1]) - length += add_str (&string[length], tzname[1], max - length); - else - length += add_str (&string[length], tzname[0], max - length); -#else - length += add_str (&string[length], zone_name (tm), max - length); + 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 - break; + if (modifier == 'O') + goto bad_format; + else + DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE); - /* Date fields: */ - case 'a': - add_char (days[tm->tm_wday][0]); - add_char (days[tm->tm_wday][1]); - add_char (days[tm->tm_wday][2]); - break; - case 'A': - length += - add_str (&string[length], days[tm->tm_wday], max - length); - break; - case 'b': - case 'h': - add_char (months[tm->tm_mon][0]); - add_char (months[tm->tm_mon][1]); - add_char (months[tm->tm_mon][2]); - break; - case 'B': - length += - add_str (&string[length], months[tm->tm_mon], max - length); - break; - case 'c': - length += - strftime (&string[length], max - length, - "%a %b %d %H:%M:%S %Z %Y", tm); - break; - case 'C': - length += - add_num2 (&string[length], (tm->tm_year + 1900) / 100, - max - length, pad); - break; - case 'd': - length += - add_num2 (&string[length], tm->tm_mday, max - length, pad); - break; - case 'e': - length += - add_num2 (&string[length], tm->tm_mday, max - length, blank); - break; - case 'D': - length += - strftime (&string[length], max - length, "%m/%d/%y", tm); - break; - case 'j': - length += - add_num3 (&string[length], tm->tm_yday + 1, max - length, pad); - break; - case 'm': - length += - add_num2 (&string[length], tm->tm_mon + 1, max - length, pad); - break; - case 'U': - length += - add_num2 (&string[length], sun_week (tm), max - length, pad); - break; - case 'w': - add_char (tm->tm_wday + '0'); - break; - case 'W': - length += - add_num2 (&string[length], mon_week (tm), max - length, pad); - break; - case 'x': - length += - strftime (&string[length], max - length, "%m/%d/%y", tm); - break; - case 'y': - length += - add_num2 (&string[length], tm->tm_year % 100, - max - length, pad); - break; - case 'Y': - add_char ((tm->tm_year + 1900) / 1000 + '0'); - length += - add_num3 (&string[length], - (1900 + tm->tm_year) % 1000, max - length, zero); - break; + 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; } } - add_char (0); - return length - 1; + + if (p) + *p = '\0'; + return i; }