diff options
Diffstat (limited to 'REORG.TODO/time/asctime.c')
-rw-r--r-- | REORG.TODO/time/asctime.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/REORG.TODO/time/asctime.c b/REORG.TODO/time/asctime.c new file mode 100644 index 0000000000..b57de7dc8b --- /dev/null +++ b/REORG.TODO/time/asctime.c @@ -0,0 +1,89 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include "../locale/localeinfo.h" +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <time.h> + +/* This is defined in locale/C-time.c in the GNU libc. */ +extern const struct __locale_data _nl_C_LC_TIME attribute_hidden; +#define ab_day_name(DAY) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)+(DAY)].string) +#define ab_month_name(MON) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)+(MON)].string) + +static const char format[] = "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n"; +static char result[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1]; + + +static char * +asctime_internal (const struct tm *tp, char *buf, size_t buflen) +{ + if (tp == NULL) + { + __set_errno (EINVAL); + return NULL; + } + + /* We limit the size of the year which can be printed. Using the %d + format specifier used the addition of 1900 would overflow the + number and a negative vaue is printed. For some architectures we + could in theory use %ld or an evern larger integer format but + this would mean the output needs more space. This would not be a + problem if the 'asctime_r' interface would be defined sanely and + a buffer size would be passed. */ + if (__glibc_unlikely (tp->tm_year > INT_MAX - 1900)) + { + eoverflow: + __set_errno (EOVERFLOW); + return NULL; + } + + int n = __snprintf (buf, buflen, format, + (tp->tm_wday < 0 || tp->tm_wday >= 7 ? + "???" : ab_day_name (tp->tm_wday)), + (tp->tm_mon < 0 || tp->tm_mon >= 12 ? + "???" : ab_month_name (tp->tm_mon)), + tp->tm_mday, tp->tm_hour, tp->tm_min, + tp->tm_sec, 1900 + tp->tm_year); + if (n < 0) + return NULL; + if (n >= buflen) + goto eoverflow; + + return buf; +} + + +/* Like asctime, but write result to the user supplied buffer. The + buffer is only guaranteed to be 26 bytes in length. */ +char * +__asctime_r (const struct tm *tp, char *buf) +{ + return asctime_internal (tp, buf, 26); +} +weak_alias (__asctime_r, asctime_r) + + +/* Returns a string of the form "Day Mon dd hh:mm:ss yyyy\n" + which is the representation of TP in that form. */ +char * +asctime (const struct tm *tp) +{ + return asctime_internal (tp, result, sizeof (result)); +} +libc_hidden_def (asctime) |