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)
191 /* Placate gcc-4's -Wuninitialized.
192 posix_time_parse fails to set all of tm0 only when it returns
193 nonzero (due to year() returning nonzero), and in that case,
194 this code doesn't use the tm0 at all. */
202 if (posix_time_parse (&tm0, s, syntax_bits))
209 if (t != (time_t) -1)
213 /* mktime returns -1 for errors, but -1 is also a valid time_t
214 value. Check whether an error really occurred. */
220 /* Reject dates like "September 31" and times like "25:61". */
221 if ((tm0.tm_year ^ tm->tm_year)
222 | (tm0.tm_mon ^ tm->tm_mon)
223 | (tm0.tm_mday ^ tm->tm_mday)
224 | (tm0.tm_hour ^ tm->tm_hour)
225 | (tm0.tm_min ^ tm->tm_min)
226 | (tm0.tm_sec ^ tm->tm_sec))
233 #ifdef TEST_POSIXTIME
235 Test mainly with syntax_bits == 13
236 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
238 This test data assumes Universal Time, e.g., TZ="UTC0".
240 This test data also assumes that time_t is signed and is at least
241 39 bits wide, so that it can represent all years from 0000 through
242 9999. A host with 32-bit signed time_t can represent only time
243 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
244 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
245 cases outside this range will not work on such a host.
247 Also, the first two lines of test data assume that the current
251 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
252 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
253 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
254 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
255 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
256 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
257 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
258 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
259 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
260 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
261 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
262 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
263 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
264 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
265 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
266 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
267 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
268 197001000000.00 13 * *
269 197000010000.00 13 * *
270 197001010000.60 13 * *
271 197001010060.00 13 * *
272 197001012400.00 13 * *
273 197001320000.00 13 * *
274 197013010000.00 13 * *
275 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
276 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
277 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
278 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
279 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
280 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
281 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
282 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
283 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
284 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
285 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
286 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
287 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
288 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
289 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
294 # define MAX_BUFF_LEN 1024
299 char buff[MAX_BUFF_LEN + 1];
301 buff[MAX_BUFF_LEN] = 0;
302 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
304 char time_str[MAX_BUFF_LEN];
305 unsigned int syntax_bits;
307 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
311 printf ("%-15s %2u ", time_str, syntax_bits);
312 if (posixtime (&t, time_str, syntax_bits))
313 printf ("%12ld %s", (long int) t, ctime (&t));
315 printf ("%12s %s", "*", "*\n");
325 compile-command: "gcc -DTEST_POSIXTIME -g -O -Wall -W posixtm.c"