1 /* Parse dates for touch and date.
3 Copyright (C) 1989, 1990, 1991, 1998, 2000, 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
21 Rewritten by Jim Meyering. */
31 #include <sys/types.h>
35 # include <sys/time.h>
43 # include "unlocked-io.h"
46 /* ISDIGIT differs from isdigit, as follows:
47 - Its arg may be any int or unsigned int; it need not be an unsigned char.
48 - It's guaranteed to evaluate its argument exactly once.
49 - It's typically faster.
50 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
51 ISDIGIT_LOCALE unless it's important to use the locale's definition
52 of `digit' even when the host does not conform to POSIX. */
53 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
60 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
61 8, 10, or 12 digits, followed by optional .ss
62 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
64 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
70 (PDS_TRAILING_YEAR | PDS_CENTURY)
75 year (struct tm *tm, const int *digit_pair, size_t n, int allow_century)
80 tm->tm_year = *digit_pair;
81 /* Deduce the century based on the year.
82 POSIX requires that 00-68 be interpreted as 2000-2068,
83 and that 69-99 be interpreted as 1969-1999. */
84 if (digit_pair[0] <= 68)
91 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
99 /* Use current year. */
101 tmp = localtime (&now);
104 tm->tm_year = tmp->tm_year;
116 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
118 const char *dot = NULL;
123 size_t s_len = strlen (s);
124 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
128 if (len != 8 && len != 10 && len != 12)
133 if (!(syntax_bits & PDS_SECONDS))
136 if (s_len - len != 3)
140 for (i = 0; i < len; i++)
145 for (i = 0; i < len; i++)
146 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
149 if (syntax_bits & PDS_LEADING_YEAR)
151 if (year (tm, p, len - 4, syntax_bits & PDS_CENTURY))
157 /* Handle 8 digits worth of `MMDDhhmm'. */
158 tm->tm_mon = *p++ - 1;
164 /* Handle any trailing year. */
165 if (syntax_bits & PDS_TRAILING_YEAR)
167 if (year (tm, p, len, syntax_bits & PDS_CENTURY))
171 /* Handle seconds. */
181 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
183 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
185 tm->tm_sec = seconds;
191 /* Parse a POSIX-style date, returning true if successful. */
194 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
198 /* Placate gcc-4's -Wuninitialized.
199 posix_time_parse fails to set all of tm0 only when it returns
200 nonzero (due to year() returning nonzero), and in that case,
201 this code doesn't use the tm0 at all. */
209 if (posix_time_parse (&tm0, s, syntax_bits))
216 if (t != (time_t) -1)
220 /* mktime returns -1 for errors, but -1 is also a valid time_t
221 value. Check whether an error really occurred. */
227 /* Reject dates like "September 31" and times like "25:61". */
228 if ((tm0.tm_year ^ tm->tm_year)
229 | (tm0.tm_mon ^ tm->tm_mon)
230 | (tm0.tm_mday ^ tm->tm_mday)
231 | (tm0.tm_hour ^ tm->tm_hour)
232 | (tm0.tm_min ^ tm->tm_min)
233 | (tm0.tm_sec ^ tm->tm_sec))
240 #ifdef TEST_POSIXTIME
242 Test mainly with syntax_bits == 13
243 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
245 This test data assumes Universal Time, e.g., TZ="UTC0".
247 This test data also assumes that time_t is signed and is at least
248 39 bits wide, so that it can represent all years from 0000 through
249 9999. A host with 32-bit signed time_t can represent only time
250 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
251 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
252 cases outside this range will not work on such a host.
254 Also, the first two lines of test data assume that the current
258 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
259 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
260 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
261 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
262 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
263 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
264 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
265 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
266 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
267 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
268 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
269 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
270 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
271 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
272 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
273 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
274 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
275 197001000000.00 13 * *
276 197000010000.00 13 * *
277 197001010000.60 13 * *
278 197001010060.00 13 * *
279 197001012400.00 13 * *
280 197001320000.00 13 * *
281 197013010000.00 13 * *
282 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
283 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
284 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
285 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
286 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
287 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
288 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
289 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
290 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
291 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
292 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
293 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
294 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
295 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
296 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
301 # define MAX_BUFF_LEN 1024
306 char buff[MAX_BUFF_LEN + 1];
308 buff[MAX_BUFF_LEN] = 0;
309 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
311 char time_str[MAX_BUFF_LEN];
312 unsigned int syntax_bits;
314 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
318 printf ("%-15s %2u ", time_str, syntax_bits);
319 if (posixtime (&t, time_str, syntax_bits))
320 printf ("%12ld %s", (long int) t, ctime (&t));
322 printf ("%12s %s", "*", "*\n");
332 compile-command: "gcc -DTEST_POSIXTIME -DHAVE_CONFIG_H -I.. -g -O -Wall -W posixtm.c"