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emacs/lib/strftime.c
Paul Eggert 16c3e636a6 strftime: import from gnulib
2011-01-30 15:34:18 -08:00

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/* Copyright (C) 1991-2001, 2003-2007, 2009-2011 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.
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 3 of the License, 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/>. */
#ifdef _LIBC
# define HAVE_STRUCT_ERA_ENTRY 1
# define HAVE_TM_GMTOFF 1
# define HAVE_TM_ZONE 1
# define HAVE_TZNAME 1
# define HAVE_TZSET 1
# include "../locale/localeinfo.h"
#else
# include <config.h>
# if FPRINTFTIME
# include "ignore-value.h"
# include "fprintftime.h"
# else
# include "strftime.h"
# endif
#endif
#include <ctype.h>
#include <time.h>
#if HAVE_TZNAME && !HAVE_DECL_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 multibyte encodings used by the
C library on the various platforms (UTF-8, GB2312, GBK, CP936,
GB18030, EUC-TW, BIG5, BIG5-HKSCS, CP950, EUC-JP, EUC-KR, CP949,
SHIFT_JIS, CP932, JOHAB) are safe for formats, because the byte '%'
cannot occur in a multibyte character except in the first byte.
The DEC-HANYU encoding used on OSF/1 is not safe for formats, but
this encoding has never been seen in real-life use, so we ignore
it. */
#if !(defined __osf__ && 0)
# define MULTIBYTE_IS_FORMAT_SAFE 1
#endif
#define DO_MULTIBYTE (! MULTIBYTE_IS_FORMAT_SAFE)
#if DO_MULTIBYTE
# include <wchar.h>
static const mbstate_t mbstate_zero;
#endif
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#ifdef COMPILE_WIDE
# include <endian.h>
# define CHAR_T wchar_t
# define UCHAR_T unsigned int
# define L_(Str) L##Str
# define NLW(Sym) _NL_W##Sym
# define MEMCPY(d, s, n) __wmemcpy (d, s, n)
# define STRLEN(s) __wcslen (s)
#else
# define CHAR_T char
# define UCHAR_T unsigned char
# define L_(Str) Str
# define NLW(Sym) Sym
# define MEMCPY(d, s, n) memcpy (d, s, n)
# define STRLEN(s) strlen (s)
#endif
/* Shift A right by B bits portably, by dividing A by 2**B and
truncating towards minus infinity. A and B should be free of side
effects, and B should be in the range 0 <= B <= INT_BITS - 2, where
INT_BITS is the number of useful bits in an int. GNU code can
assume that INT_BITS is at least 32.
ISO C99 says that A >> B is implementation-defined if A < 0. Some
implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift
right in the usual way when A < 0, so SHR falls back on division if
ordinary A >> B doesn't seem to be the usual signed shift. */
#define SHR(a, b) \
(-1 >> 1 == -1 \
? (a) >> (b) \
: (a) / (1 << (b)) - ((a) % (1 << (b)) < 0))
/* Bound on length of the string representing an integer type or expression T.
Subtract 1 for the sign bit if t is signed; log10 (2.0) < 146/485;
add 1 for integer division truncation; add 1 more for a minus sign
if needed. */
#define INT_STRLEN_BOUND(t) \
((sizeof (t) * CHAR_BIT - 1) * 146 / 485 + 2)
#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 tzname __tzname
# define tzset __tzset
#endif
#if !HAVE_TM_GMTOFF
/* Portable standalone applications should supply a "time.h" that
declares a POSIX-compliant localtime_r, for the benefit of older
implementations that lack localtime_r or have a nonstandard one.
See the gnulib time_r module for one way to implement this. */
# undef __gmtime_r
# undef __localtime_r
# define __gmtime_r gmtime_r
# define __localtime_r localtime_r
#endif
#ifndef FPRINTFTIME
# define FPRINTFTIME 0
#endif
#if FPRINTFTIME
# define STREAM_OR_CHAR_T FILE
# define STRFTIME_ARG(x) /* empty */
#else
# define STREAM_OR_CHAR_T CHAR_T
# define STRFTIME_ARG(x) x,
#endif
#if FPRINTFTIME
# define memset_byte(P, Len, Byte) \
do { size_t _i; for (_i = 0; _i < Len; _i++) fputc (Byte, P); } while (0)
# define memset_space(P, Len) memset_byte (P, Len, ' ')
# define memset_zero(P, Len) memset_byte (P, Len, '0')
#elif defined COMPILE_WIDE
# define memset_space(P, Len) (wmemset (P, L' ', Len), (P) += (Len))
# define memset_zero(P, Len) (wmemset (P, L'0', Len), (P) += (Len))
#else
# define memset_space(P, Len) (memset (P, ' ', Len), (P) += (Len))
# define memset_zero(P, Len) (memset (P, '0', Len), (P) += (Len))
#endif
#if FPRINTFTIME
# define advance(P, N)
#else
# define advance(P, N) ((P) += (N))
#endif
#define add(n, f) \
do \
{ \
int _n = (n); \
int _delta = width - _n; \
int _incr = _n + (_delta > 0 ? _delta : 0); \
if ((size_t) _incr >= maxsize - i) \
return 0; \
if (p) \
{ \
if (digits == 0 && _delta > 0) \
{ \
if (pad == L_('0')) \
memset_zero (p, _delta); \
else \
memset_space (p, _delta); \
} \
f; \
advance (p, _n); \
} \
i += _incr; \
} while (0)
#if FPRINTFTIME
# define add1(C) add (1, fputc (C, p))
#else
# define add1(C) add (1, *p = C)
#endif
#if FPRINTFTIME
# define cpy(n, s) \
add ((n), \
do \
{ \
if (to_lowcase) \
fwrite_lowcase (p, (s), _n); \
else if (to_uppcase) \
fwrite_uppcase (p, (s), _n); \
else \
{ \
/* We are ignoring the value of fwrite here, in spite of the \
fact that technically, that may not be valid: the fwrite \
specification in POSIX 2008 defers to that of fputc, which \
is intended to be consistent with the one from ISO C, \
which permits failure due to ENOMEM *without* setting the \
stream's error indicator. */ \
ignore_value (fwrite ((s), _n, 1, p)); \
} \
} \
while (0) \
)
#else
# define cpy(n, s) \
add ((n), \
if (to_lowcase) \
memcpy_lowcase (p, (s), _n LOCALE_ARG); \
else if (to_uppcase) \
memcpy_uppcase (p, (s), _n LOCALE_ARG); \
else \
MEMCPY ((void *) p, (void const *) (s), _n))
#endif
#ifdef COMPILE_WIDE
# ifndef USE_IN_EXTENDED_LOCALE_MODEL
# undef __mbsrtowcs_l
# define __mbsrtowcs_l(d, s, l, st, loc) __mbsrtowcs (d, s, l, st)
# endif
# define widen(os, ws, l) \
{ \
mbstate_t __st; \
const char *__s = os; \
memset (&__st, '\0', sizeof (__st)); \
l = __mbsrtowcs_l (NULL, &__s, 0, &__st, loc); \
ws = (wchar_t *) alloca ((l + 1) * sizeof (wchar_t)); \
(void) __mbsrtowcs_l (ws, &__s, l, &__st, loc); \
}
#endif
#if defined _LIBC && defined USE_IN_EXTENDED_LOCALE_MODEL
/* We use this code also for the extended locale handling where the
function gets as an additional argument the locale which has to be
used. To access the values we have to redefine the _NL_CURRENT
macro. */
# define strftime __strftime_l
# define wcsftime __wcsftime_l
# undef _NL_CURRENT
# define _NL_CURRENT(category, item) \
(current->values[_NL_ITEM_INDEX (item)].string)
# define LOCALE_ARG , loc
# define LOCALE_PARAM_PROTO , __locale_t loc
# define HELPER_LOCALE_ARG , current
#else
# define LOCALE_PARAM_PROTO
# define LOCALE_ARG
# ifdef _LIBC
# define HELPER_LOCALE_ARG , _NL_CURRENT_DATA (LC_TIME)
# else
# define HELPER_LOCALE_ARG
# endif
#endif
#ifdef COMPILE_WIDE
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
# define TOUPPER(Ch, L) __towupper_l (Ch, L)
# define TOLOWER(Ch, L) __towlower_l (Ch, L)
# else
# define TOUPPER(Ch, L) towupper (Ch)
# define TOLOWER(Ch, L) towlower (Ch)
# endif
#else
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
# define TOUPPER(Ch, L) __toupper_l (Ch, L)
# define TOLOWER(Ch, L) __tolower_l (Ch, L)
# else
# define TOUPPER(Ch, L) toupper (Ch)
# define TOLOWER(Ch, L) tolower (Ch)
# endif
#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) - L_('0') <= 9)
#if FPRINTFTIME
static void
fwrite_lowcase (FILE *fp, const CHAR_T *src, size_t len)
{
while (len-- > 0)
{
fputc (TOLOWER ((UCHAR_T) *src, loc), fp);
++src;
}
}
static void
fwrite_uppcase (FILE *fp, const CHAR_T *src, size_t len)
{
while (len-- > 0)
{
fputc (TOUPPER ((UCHAR_T) *src, loc), fp);
++src;
}
}
#else
static CHAR_T *
memcpy_lowcase (CHAR_T *dest, const CHAR_T *src,
size_t len LOCALE_PARAM_PROTO)
{
while (len-- > 0)
dest[len] = TOLOWER ((UCHAR_T) src[len], loc);
return dest;
}
static CHAR_T *
memcpy_uppcase (CHAR_T *dest, const CHAR_T *src,
size_t len LOCALE_PARAM_PROTO)
{
while (len-- > 0)
dest[len] = TOUPPER ((UCHAR_T) src[len], loc);
return dest;
}
#endif
#if ! HAVE_TM_GMTOFF
/* Yield the difference between *A and *B,
measured in seconds, ignoring leap seconds. */
# define tm_diff ftime_tm_diff
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 = SHR (a->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (a->tm_year & 3);
int b4 = SHR (b->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (b->tm_year & 3);
int a100 = a4 / 25 - (a4 % 25 < 0);
int b100 = b4 / 25 - (b4 % 25 < 0);
int a400 = SHR (a100, 2);
int b400 = SHR (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)
#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);
}
/* When compiling this file, GNU applications can #define my_strftime
to a symbol (typically nstrftime) to get an extended strftime with
extra arguments UT and NS. Emacs is a special case for now, but
this Emacs-specific code can be removed once Emacs's config.h
defines my_strftime. */
#if defined emacs && !defined my_strftime
# define my_strftime nstrftime
#endif
#if FPRINTFTIME
# undef my_strftime
# define my_strftime fprintftime
#endif
#ifdef my_strftime
# define extra_args , ut, ns
# define extra_args_spec , int ut, int ns
#else
# if defined COMPILE_WIDE
# define my_strftime wcsftime
# define nl_get_alt_digit _nl_get_walt_digit
# else
# define my_strftime strftime
# define nl_get_alt_digit _nl_get_alt_digit
# endif
# define extra_args
# define extra_args_spec
/* We don't have this information in general. */
# define ut 0
# define ns 0
#endif
/* Just like my_strftime, below, but with one more parameter, UPCASE,
to indicate that the result should be converted to upper case. */
static size_t
strftime_case_ (bool upcase, STREAM_OR_CHAR_T *s,
STRFTIME_ARG (size_t maxsize)
const CHAR_T *format,
const struct tm *tp extra_args_spec LOCALE_PARAM_PROTO)
{
#if defined _LIBC && defined USE_IN_EXTENDED_LOCALE_MODEL
struct locale_data *const current = loc->__locales[LC_TIME];
#endif
#if FPRINTFTIME
size_t maxsize = (size_t) -1;
#endif
int hour12 = tp->tm_hour;
#ifdef _NL_CURRENT
/* 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 \
((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(ABDAY_1) + tp->tm_wday))
# define f_wkday \
((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(DAY_1) + tp->tm_wday))
# define a_month \
((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(ABMON_1) + tp->tm_mon))
# define f_month \
((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(MON_1) + tp->tm_mon))
# define ampm \
((const CHAR_T *) _NL_CURRENT (LC_TIME, tp->tm_hour > 11 \
? NLW(PM_STR) : NLW(AM_STR)))
# define aw_len STRLEN (a_wkday)
# define am_len STRLEN (a_month)
# define ap_len STRLEN (ampm)
#endif
const char *zone;
size_t i = 0;
STREAM_OR_CHAR_T *p = s;
const CHAR_T *f;
#if DO_MULTIBYTE && !defined COMPILE_WIDE
const char *format_end = NULL;
#endif
#if ! defined _LIBC && ! HAVE_RUN_TZSET_TEST
/* Solaris 2.5.x and 2.6 tzset sometimes modify the storage returned
by localtime. On such systems, we must either use the tzset and
localtime wrappers to work around the bug (which sets
HAVE_RUN_TZSET_TEST) or make a copy of the structure. */
struct tm copy = *tp;
tp = &copy;
#endif
zone = NULL;
#if HAVE_TM_ZONE
/* The POSIX test suite assumes that 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.
This is bogus: though POSIX allows bad behavior like this,
POSIX does not require it. Do the right thing instead. */
zone = (const char *) tp->tm_zone;
#endif
#if HAVE_TZNAME
if (ut)
{
if (! (zone && *zone))
zone = "GMT";
}
else
{
/* POSIX.1 requires that local time zone information be used as
though strftime called tzset. */
# if HAVE_TZSET
tzset ();
# endif
}
#endif
if (hour12 > 12)
hour12 -= 12;
else
if (hour12 == 0)
hour12 = 12;
for (f = format; *f != '\0'; ++f)
{
int pad = 0; /* Padding for number ('-', '_', or 0). */
int modifier; /* Field modifier ('E', 'O', or 0). */
int digits = 0; /* Max digits for numeric format. */
int number_value; /* Numeric value to be printed. */
unsigned int u_number_value; /* (unsigned int) number_value. */
bool negative_number; /* The number is negative. */
bool always_output_a_sign; /* +/- should always be output. */
int tz_colon_mask; /* Bitmask of where ':' should appear. */
const CHAR_T *subfmt;
CHAR_T sign_char;
CHAR_T *bufp;
CHAR_T buf[1
+ 2 /* for the two colons in a %::z or %:::z time zone */
+ (sizeof (int) < sizeof (time_t)
? INT_STRLEN_BOUND (time_t)
: INT_STRLEN_BOUND (int))];
int width = -1;
bool to_lowcase = false;
bool to_uppcase = upcase;
size_t colons;
bool change_case = false;
int format_char;
#if DO_MULTIBYTE && !defined COMPILE_WIDE
switch (*f)
{
case L_('%'):
break;
case L_('\b'): case L_('\t'): case L_('\n'):
case L_('\v'): case L_('\f'): case L_('\r'):
case L_(' '): case L_('!'): case L_('"'): case L_('#'): case L_('&'):
case L_('\''): case L_('('): case L_(')'): case L_('*'): case L_('+'):
case L_(','): case L_('-'): case L_('.'): case L_('/'): case L_('0'):
case L_('1'): case L_('2'): case L_('3'): case L_('4'): case L_('5'):
case L_('6'): case L_('7'): case L_('8'): case L_('9'): case L_(':'):
case L_(';'): case L_('<'): case L_('='): case L_('>'): case L_('?'):
case L_('A'): case L_('B'): case L_('C'): case L_('D'): case L_('E'):
case L_('F'): case L_('G'): case L_('H'): case L_('I'): case L_('J'):
case L_('K'): case L_('L'): case L_('M'): case L_('N'): case L_('O'):
case L_('P'): case L_('Q'): case L_('R'): case L_('S'): case L_('T'):
case L_('U'): case L_('V'): case L_('W'): case L_('X'): case L_('Y'):
case L_('Z'): case L_('['): case L_('\\'): case L_(']'): case L_('^'):
case L_('_'): case L_('a'): case L_('b'): case L_('c'): case L_('d'):
case L_('e'): case L_('f'): case L_('g'): case L_('h'): case L_('i'):
case L_('j'): case L_('k'): case L_('l'): case L_('m'): case L_('n'):
case L_('o'): case L_('p'): case L_('q'): case L_('r'): case L_('s'):
case L_('t'): case L_('u'): case L_('v'): case L_('w'): case L_('x'):
case L_('y'): case L_('z'): case L_('{'): case L_('|'): case L_('}'):
case L_('~'):
/* 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. */
add1 (*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;
size_t fsize;
if (! format_end)
format_end = f + strlen (f) + 1;
fsize = format_end - f;
do
{
size_t bytes = mbrlen (f + len, fsize - len, &mbstate);
if (bytes == 0)
break;
if (bytes == (size_t) -2)
{
len += strlen (f + len);
break;
}
if (bytes == (size_t) -1)
{
len++;
break;
}
len += bytes;
}
while (! mbsinit (&mbstate));
cpy (len, f);
f += len - 1;
continue;
}
}
#else /* ! DO_MULTIBYTE */
/* Either multibyte encodings are not supported, they are
safe for formats, so any non-'%' byte can be copied through,
or this is the wide character version. */
if (*f != L_('%'))
{
add1 (*f);
continue;
}
#endif /* ! DO_MULTIBYTE */
/* Check for flags that can modify a format. */
while (1)
{
switch (*++f)
{
/* This influences the number formats. */
case L_('_'):
case L_('-'):
case L_('0'):
pad = *f;
continue;
/* This changes textual output. */
case L_('^'):
to_uppcase = true;
continue;
case L_('#'):
change_case = true;
continue;
default:
break;
}
break;
}
/* As a GNU extension we allow to specify the field width. */
if (ISDIGIT (*f))
{
width = 0;
do
{
if (width > INT_MAX / 10
|| (width == INT_MAX / 10 && *f - L_('0') > INT_MAX % 10))
/* Avoid overflow. */
width = INT_MAX;
else
{
width *= 10;
width += *f - L_('0');
}
++f;
}
while (ISDIGIT (*f));
}
/* Check for modifiers. */
switch (*f)
{
case L_('E'):
case L_('O'):
modifier = *f++;
break;
default:
modifier = 0;
break;
}
/* Now do the specified format. */
format_char = *f;
switch (format_char)
{
#define DO_NUMBER(d, v) \
digits = d; \
number_value = v; goto do_number
#define DO_SIGNED_NUMBER(d, negative, v) \
digits = d; \
negative_number = negative; \
u_number_value = v; goto do_signed_number
/* The mask is not what you might think.
When the ordinal i'th bit is set, insert a colon
before the i'th digit of the time zone representation. */
#define DO_TZ_OFFSET(d, negative, mask, v) \
digits = d; \
negative_number = negative; \
tz_colon_mask = mask; \
u_number_value = v; goto do_tz_offset
#define DO_NUMBER_SPACEPAD(d, v) \
digits = d; \
number_value = v; goto do_number_spacepad
case L_('%'):
if (modifier != 0)
goto bad_format;
add1 (*f);
break;
case L_('a'):
if (modifier != 0)
goto bad_format;
if (change_case)
{
to_uppcase = true;
to_lowcase = false;
}
#ifdef _NL_CURRENT
cpy (aw_len, a_wkday);
break;
#else
goto underlying_strftime;
#endif
case 'A':
if (modifier != 0)
goto bad_format;
if (change_case)
{
to_uppcase = true;
to_lowcase = false;
}
#ifdef _NL_CURRENT
cpy (STRLEN (f_wkday), f_wkday);
break;
#else
goto underlying_strftime;
#endif
case L_('b'):
case L_('h'):
if (change_case)
{
to_uppcase = true;
to_lowcase = false;
}
if (modifier != 0)
goto bad_format;
#ifdef _NL_CURRENT
cpy (am_len, a_month);
break;
#else
goto underlying_strftime;
#endif
case L_('B'):
if (modifier != 0)
goto bad_format;
if (change_case)
{
to_uppcase = true;
to_lowcase = false;
}
#ifdef _NL_CURRENT
cpy (STRLEN (f_month), f_month);
break;
#else
goto underlying_strftime;
#endif
case L_('c'):
if (modifier == L_('O'))
goto bad_format;
#ifdef _NL_CURRENT
if (! (modifier == 'E'
&& (*(subfmt =
(const CHAR_T *) _NL_CURRENT (LC_TIME,
NLW(ERA_D_T_FMT)))
!= '\0')))
subfmt = (const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(D_T_FMT));
#else
goto underlying_strftime;
#endif
subformat:
{
size_t len = strftime_case_ (to_uppcase,
NULL, STRFTIME_ARG ((size_t) -1)
subfmt,
tp extra_args LOCALE_ARG);
add (len, strftime_case_ (to_uppcase, p,
STRFTIME_ARG (maxsize - i)
subfmt,
tp extra_args LOCALE_ARG));
}
break;
#if !(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[5];
char *u = ufmt;
char ubuf[1024]; /* enough for any single format in practice */
size_t len;
/* Make sure we're calling the actual underlying strftime.
In some cases, config.h contains something like
"#define strftime rpl_strftime". */
# ifdef strftime
# undef strftime
size_t strftime ();
# endif
/* The space helps distinguish strftime failure from empty
output. */
*u++ = ' ';
*u++ = '%';
if (modifier != 0)
*u++ = modifier;
*u++ = format_char;
*u = '\0';
len = strftime (ubuf, sizeof ubuf, ufmt, tp);
if (len != 0)
cpy (len - 1, ubuf + 1);
}
break;
#endif
case L_('C'):
if (modifier == L_('O'))
goto bad_format;
if (modifier == L_('E'))
{
#if HAVE_STRUCT_ERA_ENTRY
struct era_entry *era = _nl_get_era_entry (tp HELPER_LOCALE_ARG);
if (era)
{
# ifdef COMPILE_WIDE
size_t len = __wcslen (era->era_wname);
cpy (len, era->era_wname);
# else
size_t len = strlen (era->era_name);
cpy (len, era->era_name);
# endif
break;
}
#else
goto underlying_strftime;
#endif
}
{
int century = tp->tm_year / 100 + TM_YEAR_BASE / 100;
century -= tp->tm_year % 100 < 0 && 0 < century;
DO_SIGNED_NUMBER (2, tp->tm_year < - TM_YEAR_BASE, century);
}
case L_('x'):
if (modifier == L_('O'))
goto bad_format;
#ifdef _NL_CURRENT
if (! (modifier == L_('E')
&& (*(subfmt =
(const CHAR_T *)_NL_CURRENT (LC_TIME, NLW(ERA_D_FMT)))
!= L_('\0'))))
subfmt = (const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(D_FMT));
goto subformat;
#else
goto underlying_strftime;
#endif
case L_('D'):
if (modifier != 0)
goto bad_format;
subfmt = L_("%m/%d/%y");
goto subformat;
case L_('d'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, tp->tm_mday);
case L_('e'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER_SPACEPAD (2, tp->tm_mday);
/* All numeric formats set DIGITS and NUMBER_VALUE (or U_NUMBER_VALUE)
and then jump to one of these labels. */
do_tz_offset:
always_output_a_sign = true;
goto do_number_body;
do_number_spacepad:
/* Force `_' flag unless overridden by `0' or `-' flag. */
if (pad != L_('0') && pad != L_('-'))
pad = L_('_');
do_number:
/* Format NUMBER_VALUE according to the MODIFIER flag. */
negative_number = number_value < 0;
u_number_value = number_value;
do_signed_number:
always_output_a_sign = false;
tz_colon_mask = 0;
do_number_body:
/* Format U_NUMBER_VALUE according to the MODIFIER flag.
NEGATIVE_NUMBER is nonzero if the original number was
negative; in this case it was converted directly to
unsigned int (i.e., modulo (UINT_MAX + 1)) without
negating it. */
if (modifier == L_('O') && !negative_number)
{
#ifdef _NL_CURRENT
/* Get the locale specific alternate representation of
the number. If none exist NULL is returned. */
const CHAR_T *cp = nl_get_alt_digit (u_number_value
HELPER_LOCALE_ARG);
if (cp != NULL)
{
size_t digitlen = STRLEN (cp);
if (digitlen != 0)
{
cpy (digitlen, cp);
break;
}
}
#else
goto underlying_strftime;
#endif
}
bufp = buf + sizeof (buf) / sizeof (buf[0]);
if (negative_number)
u_number_value = - u_number_value;
do
{
if (tz_colon_mask & 1)
*--bufp = ':';
tz_colon_mask >>= 1;
*--bufp = u_number_value % 10 + L_('0');
u_number_value /= 10;
}
while (u_number_value != 0 || tz_colon_mask != 0);
do_number_sign_and_padding:
if (digits < width)
digits = width;
sign_char = (negative_number ? L_('-')
: always_output_a_sign ? L_('+')
: 0);
if (pad == L_('-'))
{
if (sign_char)
add1 (sign_char);
}
else
{
int padding = digits - (buf + (sizeof (buf) / sizeof (buf[0]))
- bufp) - !!sign_char;
if (padding > 0)
{
if (pad == L_('_'))
{
if ((size_t) padding >= maxsize - i)
return 0;
if (p)
memset_space (p, padding);
i += padding;
width = width > padding ? width - padding : 0;
if (sign_char)
add1 (sign_char);
}
else
{
if ((size_t) digits >= maxsize - i)
return 0;
if (sign_char)
add1 (sign_char);
if (p)
memset_zero (p, padding);
i += padding;
width = 0;
}
}
else
{
if (sign_char)
add1 (sign_char);
}
}
cpy (buf + sizeof (buf) / sizeof (buf[0]) - bufp, bufp);
break;
case L_('F'):
if (modifier != 0)
goto bad_format;
subfmt = L_("%Y-%m-%d");
goto subformat;
case L_('H'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, tp->tm_hour);
case L_('I'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, hour12);
case L_('k'): /* GNU extension. */
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER_SPACEPAD (2, tp->tm_hour);
case L_('l'): /* GNU extension. */
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER_SPACEPAD (2, hour12);
case L_('j'):
if (modifier == L_('E'))
goto bad_format;
DO_SIGNED_NUMBER (3, tp->tm_yday < -1, tp->tm_yday + 1U);
case L_('M'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, tp->tm_min);
case L_('m'):
if (modifier == L_('E'))
goto bad_format;
DO_SIGNED_NUMBER (2, tp->tm_mon < -1, tp->tm_mon + 1U);
#ifndef _LIBC
case L_('N'): /* GNU extension. */
if (modifier == L_('E'))
goto bad_format;
number_value = ns;
if (width == -1)
width = 9;
else
{
/* Take an explicit width less than 9 as a precision. */
int j;
for (j = width; j < 9; j++)
number_value /= 10;
}
DO_NUMBER (width, number_value);
#endif
case L_('n'):
add1 (L_('\n'));
break;
case L_('P'):
to_lowcase = true;
#ifndef _NL_CURRENT
format_char = L_('p');
#endif
/* FALLTHROUGH */
case L_('p'):
if (change_case)
{
to_uppcase = false;
to_lowcase = true;
}
#ifdef _NL_CURRENT
cpy (ap_len, ampm);
break;
#else
goto underlying_strftime;
#endif
case L_('R'):
subfmt = L_("%H:%M");
goto subformat;
case L_('r'):
#ifdef _NL_CURRENT
if (*(subfmt = (const CHAR_T *) _NL_CURRENT (LC_TIME,
NLW(T_FMT_AMPM)))
== L_('\0'))
subfmt = L_("%I:%M:%S %p");
goto subformat;
#else
goto underlying_strftime;
#endif
case L_('S'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, tp->tm_sec);
case L_('s'): /* GNU extension. */
{
struct tm ltm;
time_t t;
ltm = *tp;
t = mktime (&ltm);
/* Generate string value for T using time_t arithmetic;
this works even if sizeof (long) < sizeof (time_t). */
bufp = buf + sizeof (buf) / sizeof (buf[0]);
negative_number = t < 0;
do
{
int d = t % 10;
t /= 10;
*--bufp = (negative_number ? -d : d) + L_('0');
}
while (t != 0);
digits = 1;
always_output_a_sign = false;
goto do_number_sign_and_padding;
}
case L_('X'):
if (modifier == L_('O'))
goto bad_format;
#ifdef _NL_CURRENT
if (! (modifier == L_('E')
&& (*(subfmt =
(const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(ERA_T_FMT)))
!= L_('\0'))))
subfmt = (const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(T_FMT));
goto subformat;
#else
goto underlying_strftime;
#endif
case L_('T'):
subfmt = L_("%H:%M:%S");
goto subformat;
case L_('t'):
add1 (L_('\t'));
break;
case L_('u'):
DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1);
case L_('U'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7);
case L_('V'):
case L_('g'):
case L_('G'):
if (modifier == L_('E'))
goto bad_format;
{
/* YEAR is a leap year if and only if (tp->tm_year + TM_YEAR_BASE)
is a leap year, except that YEAR and YEAR - 1 both work
correctly even when (tp->tm_year + TM_YEAR_BASE) would
overflow. */
int year = (tp->tm_year
+ (tp->tm_year < 0
? TM_YEAR_BASE % 400
: TM_YEAR_BASE % 400 - 400));
int year_adjust = 0;
int days = iso_week_days (tp->tm_yday, tp->tm_wday);
if (days < 0)
{
/* This ISO week belongs to the previous year. */
year_adjust = -1;
days = iso_week_days (tp->tm_yday + (365 + __isleap (year - 1)),
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_adjust = 1;
days = d;
}
}
switch (*f)
{
case L_('g'):
{
int yy = (tp->tm_year % 100 + year_adjust) % 100;
DO_NUMBER (2, (0 <= yy
? yy
: tp->tm_year < -TM_YEAR_BASE - year_adjust
? -yy
: yy + 100));
}
case L_('G'):
DO_SIGNED_NUMBER (4, tp->tm_year < -TM_YEAR_BASE - year_adjust,
(tp->tm_year + (unsigned int) TM_YEAR_BASE
+ year_adjust));
default:
DO_NUMBER (2, days / 7 + 1);
}
}
case L_('W'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7);
case L_('w'):
if (modifier == L_('E'))
goto bad_format;
DO_NUMBER (1, tp->tm_wday);
case L_('Y'):
if (modifier == 'E')
{
#if HAVE_STRUCT_ERA_ENTRY
struct era_entry *era = _nl_get_era_entry (tp HELPER_LOCALE_ARG);
if (era)
{
# ifdef COMPILE_WIDE
subfmt = era->era_wformat;
# else
subfmt = era->era_format;
# endif
goto subformat;
}
#else
goto underlying_strftime;
#endif
}
if (modifier == L_('O'))
goto bad_format;
else
DO_SIGNED_NUMBER (4, tp->tm_year < -TM_YEAR_BASE,
tp->tm_year + (unsigned int) TM_YEAR_BASE);
case L_('y'):
if (modifier == L_('E'))
{
#if HAVE_STRUCT_ERA_ENTRY
struct era_entry *era = _nl_get_era_entry (tp HELPER_LOCALE_ARG);
if (era)
{
int delta = tp->tm_year - era->start_date[0];
DO_NUMBER (1, (era->offset
+ delta * era->absolute_direction));
}
#else
goto underlying_strftime;
#endif
}
{
int yy = tp->tm_year % 100;
if (yy < 0)
yy = tp->tm_year < - TM_YEAR_BASE ? -yy : yy + 100;
DO_NUMBER (2, yy);
}
case L_('Z'):
if (change_case)
{
to_uppcase = false;
to_lowcase = true;
}
#if HAVE_TZNAME
/* The tzset() call might have changed the value. */
if (!(zone && *zone) && tp->tm_isdst >= 0)
zone = tzname[tp->tm_isdst != 0];
#endif
if (! zone)
zone = "";
#ifdef COMPILE_WIDE
{
/* The zone string is always given in multibyte form. We have
to transform it first. */
wchar_t *wczone;
size_t len;
widen (zone, wczone, len);
cpy (len, wczone);
}
#else
cpy (strlen (zone), zone);
#endif
break;
case L_(':'):
/* :, ::, and ::: are valid only just before 'z'.
:::: etc. are rejected later. */
for (colons = 1; f[colons] == L_(':'); colons++)
continue;
if (f[colons] != L_('z'))
goto bad_format;
f += colons;
goto do_z_conversion;
case L_('z'):
colons = 0;
do_z_conversion:
if (tp->tm_isdst < 0)
break;
{
int diff;
int hour_diff;
int min_diff;
int sec_diff;
#if HAVE_TM_GMTOFF
diff = tp->tm_gmtoff;
#else
if (ut)
diff = 0;
else
{
struct tm gtm;
struct tm ltm;
time_t lt;
ltm = *tp;
lt = mktime (&ltm);
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 (! __localtime_r (&lt, &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 (&lt, &gtm))
break;
diff = tm_diff (&ltm, &gtm);
}
#endif
hour_diff = diff / 60 / 60;
min_diff = diff / 60 % 60;
sec_diff = diff % 60;
switch (colons)
{
case 0: /* +hhmm */
DO_TZ_OFFSET (5, diff < 0, 0, hour_diff * 100 + min_diff);
case 1: tz_hh_mm: /* +hh:mm */
DO_TZ_OFFSET (6, diff < 0, 04, hour_diff * 100 + min_diff);
case 2: tz_hh_mm_ss: /* +hh:mm:ss */
DO_TZ_OFFSET (9, diff < 0, 024,
hour_diff * 10000 + min_diff * 100 + sec_diff);
case 3: /* +hh if possible, else +hh:mm, else +hh:mm:ss */
if (sec_diff != 0)
goto tz_hh_mm_ss;
if (min_diff != 0)
goto tz_hh_mm;
DO_TZ_OFFSET (3, diff < 0, 0, hour_diff);
default:
goto bad_format;
}
}
case L_('\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] != L_('%'); flen++)
continue;
cpy (flen, &f[1 - flen]);
}
break;
}
}
#if ! FPRINTFTIME
if (p && maxsize != 0)
*p = L_('\0');
#endif
return i;
}
/* 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) -1 for MAXSIZE. */
size_t
my_strftime (STREAM_OR_CHAR_T *s, STRFTIME_ARG (size_t maxsize)
const CHAR_T *format,
const struct tm *tp extra_args_spec LOCALE_PARAM_PROTO)
{
return strftime_case_ (false, s, STRFTIME_ARG (maxsize)
format, tp extra_args LOCALE_ARG);
}
#if defined _LIBC && ! FPRINTFTIME
libc_hidden_def (my_strftime)
#endif
#if defined emacs && ! FPRINTFTIME
/* For Emacs we have a separate interface which corresponds to the normal
strftime function plus the ut argument, but without the ns argument. */
size_t
emacs_strftimeu (char *s, size_t maxsize, const char *format,
const struct tm *tp, int ut)
{
return my_strftime (s, maxsize, format, tp, ut, 0);
}
#endif
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