1 /* Copyright (C) 1991-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include "../locale/localeinfo.h"
24 /* This is defined in locale/C-time.c in the GNU libc. */
25 extern const struct __locale_data _nl_C_LC_TIME attribute_hidden
;
26 #define ab_day_name(DAY) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)+(DAY)].string)
27 #define ab_month_name(MON) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)+(MON)].string)
29 static const char format
[] = "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n";
30 static char result
[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1];
34 asctime_internal (const struct tm
*tp
, char *buf
, size_t buflen
)
42 /* We limit the size of the year which can be printed. Using the %d
43 format specifier used the addition of 1900 would overflow the
44 number and a negative vaue is printed. For some architectures we
45 could in theory use %ld or an evern larger integer format but
46 this would mean the output needs more space. This would not be a
47 problem if the 'asctime_r' interface would be defined sanely and
48 a buffer size would be passed. */
49 if (__glibc_unlikely (tp
->tm_year
> INT_MAX
- 1900))
52 __set_errno (EOVERFLOW
);
56 int n
= __snprintf (buf
, buflen
, format
,
57 (tp
->tm_wday
< 0 || tp
->tm_wday
>= 7 ?
58 "???" : ab_day_name (tp
->tm_wday
)),
59 (tp
->tm_mon
< 0 || tp
->tm_mon
>= 12 ?
60 "???" : ab_month_name (tp
->tm_mon
)),
61 tp
->tm_mday
, tp
->tm_hour
, tp
->tm_min
,
62 tp
->tm_sec
, 1900 + tp
->tm_year
);
72 /* Like asctime, but write result to the user supplied buffer. The
73 buffer is only guaranteed to be 26 bytes in length. */
75 __asctime_r (const struct tm
*tp
, char *buf
)
77 return asctime_internal (tp
, buf
, 26);
79 weak_alias (__asctime_r
, asctime_r
)
82 /* Returns a string of the form "Day Mon dd hh:mm:ss yyyy\n"
83 which is the representation of TP in that form. */
85 asctime (const struct tm
*tp
)
87 return asctime_internal (tp
, result
, sizeof (result
));
89 libc_hidden_def (asctime
)