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d614a753 | 1 | /* Copyright (C) 1991-2020 Free Software Foundation, Inc. |
fd26970f UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
fd26970f UD |
8 | |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
fd26970f | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
933e73fa | 18 | #include "../locale/localeinfo.h" |
28f540f4 | 19 | #include <errno.h> |
576c8451 | 20 | #include <limits.h> |
28f540f4 RM |
21 | #include <stdio.h> |
22 | #include <time.h> | |
23 | ||
762a2918 | 24 | /* This is defined in locale/C-time.c in the GNU libc. */ |
f095bb72 | 25 | extern const struct __locale_data _nl_C_LC_TIME attribute_hidden; |
41d998a6 GM |
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) | |
28f540f4 | 28 | |
23396375 | 29 | static const char format[] = "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n"; |
f095bb72 | 30 | static char result[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1]; |
23396375 | 31 | |
28f540f4 | 32 | |
ce982312 UD |
33 | static char * |
34 | asctime_internal (const struct tm *tp, char *buf, size_t buflen) | |
23396375 | 35 | { |
28f540f4 RM |
36 | if (tp == NULL) |
37 | { | |
c4029823 | 38 | __set_errno (EINVAL); |
28f540f4 RM |
39 | return NULL; |
40 | } | |
23396375 | 41 | |
576c8451 UD |
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. */ | |
a1ffb40e | 49 | if (__glibc_unlikely (tp->tm_year > INT_MAX - 1900)) |
576c8451 | 50 | { |
ce982312 | 51 | eoverflow: |
576c8451 UD |
52 | __set_errno (EOVERFLOW); |
53 | return NULL; | |
54 | } | |
55 | ||
daa22612 | 56 | int n = __snprintf (buf, buflen, format, |
34a5a146 JM |
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)), | |
daa22612 UD |
61 | tp->tm_mday, tp->tm_hour, tp->tm_min, |
62 | tp->tm_sec, 1900 + tp->tm_year); | |
ce982312 | 63 | if (n < 0) |
28f540f4 | 64 | return NULL; |
ce982312 UD |
65 | if (n >= buflen) |
66 | goto eoverflow; | |
28f540f4 | 67 | |
23396375 | 68 | return buf; |
28f540f4 | 69 | } |
ce982312 UD |
70 | |
71 | ||
72 | /* Like asctime, but write result to the user supplied buffer. The | |
73 | buffer is only guaranteed to be 26 bytes in length. */ | |
74 | char * | |
75 | __asctime_r (const struct tm *tp, char *buf) | |
76 | { | |
77 | return asctime_internal (tp, buf, 26); | |
78 | } | |
23396375 | 79 | weak_alias (__asctime_r, asctime_r) |
ce982312 UD |
80 | |
81 | ||
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. */ | |
84 | char * | |
85 | asctime (const struct tm *tp) | |
86 | { | |
87 | return asctime_internal (tp, result, sizeof (result)); | |
88 | } | |
89 | libc_hidden_def (asctime) |