1 /* Parse dates for touch and date.
3 Copyright (C) 1989, 1990, 1991, 1998, 2000, 2001, 2002, 2003, 2004,
4 2005, 2006, 2007 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 3 of the License, or
9 (at your option) any later version.
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, see <http://www.gnu.org/licenses/>. */
19 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
20 Rewritten by Jim Meyering. */
28 #include <sys/types.h>
32 # include "unlocked-io.h"
35 /* ISDIGIT differs from isdigit, as follows:
36 - Its arg may be any int or unsigned int; it need not be an unsigned char
38 - It's typically faster.
39 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
40 isdigit unless it's important to use the locale's definition
41 of `digit' even when the host does not conform to POSIX. */
42 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
49 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
50 8, 10, or 12 digits, followed by optional .ss
51 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
53 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
54 8 or 10 digits, YY (if present) must be in the range 69-99
55 (PDS_TRAILING_YEAR | PDS_PRE_2000)
59 (PDS_TRAILING_YEAR | PDS_CENTURY)
64 year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
69 tm->tm_year = *digit_pair;
70 /* Deduce the century based on the year.
71 POSIX requires that 00-68 be interpreted as 2000-2068,
72 and that 69-99 be interpreted as 1969-1999. */
73 if (digit_pair[0] <= 68)
75 if (syntax_bits & PDS_PRE_2000)
82 if (! (syntax_bits & PDS_CENTURY))
84 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
92 /* Use current year. */
94 tmp = localtime (&now);
97 tm->tm_year = tmp->tm_year;
109 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
111 const char *dot = NULL;
116 size_t s_len = strlen (s);
117 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
121 if (len != 8 && len != 10 && len != 12)
126 if (!(syntax_bits & PDS_SECONDS))
129 if (s_len - len != 3)
133 for (i = 0; i < len; i++)
138 for (i = 0; i < len; i++)
139 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
142 if (syntax_bits & PDS_LEADING_YEAR)
144 if (year (tm, p, len - 4, syntax_bits))
150 /* Handle 8 digits worth of `MMDDhhmm'. */
151 tm->tm_mon = *p++ - 1;
157 /* Handle any trailing year. */
158 if (syntax_bits & PDS_TRAILING_YEAR)
160 if (year (tm, p, len, syntax_bits))
164 /* Handle seconds. */
174 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
176 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
178 tm->tm_sec = seconds;
184 /* Parse a POSIX-style date, returning true if successful. */
187 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
194 if (posix_time_parse (&tm0, s, syntax_bits))
201 if (t != (time_t) -1)
205 /* mktime returns -1 for errors, but -1 is also a valid time_t
206 value. Check whether an error really occurred. */
212 /* Reject dates like "September 31" and times like "25:61". */
213 if ((tm0.tm_year ^ tm->tm_year)
214 | (tm0.tm_mon ^ tm->tm_mon)
215 | (tm0.tm_mday ^ tm->tm_mday)
216 | (tm0.tm_hour ^ tm->tm_hour)
217 | (tm0.tm_min ^ tm->tm_min)
218 | (tm0.tm_sec ^ tm->tm_sec))
225 #ifdef TEST_POSIXTIME
227 Test mainly with syntax_bits == 13
228 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
230 This test data assumes Universal Time, e.g., TZ="UTC0".
232 This test data also assumes that time_t is signed and is at least
233 39 bits wide, so that it can represent all years from 0000 through
234 9999. A host with 32-bit signed time_t can represent only time
235 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
236 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
237 cases outside this range will not work on such a host.
239 Also, the first two lines of test data assume that the current
243 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
244 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
245 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
246 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
247 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
248 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
249 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
250 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
251 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
252 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
253 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
254 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
255 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
256 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
257 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
258 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
259 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
260 197001000000.00 13 * *
261 197000010000.00 13 * *
262 197001010000.60 13 * *
263 197001010060.00 13 * *
264 197001012400.00 13 * *
265 197001320000.00 13 * *
266 197013010000.00 13 * *
267 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
268 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
269 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
270 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
271 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
272 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
273 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
274 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
275 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
276 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
277 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
278 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
279 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
280 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
281 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
286 # define MAX_BUFF_LEN 1024
291 char buff[MAX_BUFF_LEN + 1];
293 buff[MAX_BUFF_LEN] = 0;
294 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
296 char time_str[MAX_BUFF_LEN];
297 unsigned int syntax_bits;
299 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
303 printf ("%-15s %2u ", time_str, syntax_bits);
304 if (posixtime (&t, time_str, syntax_bits))
305 printf ("%12ld %s", (long int) t, ctime (&t));
307 printf ("%12s %s", "*", "*\n");
317 compile-command: "gcc -DTEST_POSIXTIME -g -O -Wall -W posixtm.c"