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 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. */
29 #include <sys/types.h>
33 # include "unlocked-io.h"
36 /* ISDIGIT differs from isdigit, as follows:
37 - Its arg may be any int or unsigned int; it need not be an unsigned char
39 - It's typically faster.
40 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
41 isdigit unless it's important to use the locale's definition
42 of `digit' even when the host does not conform to POSIX. */
43 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
50 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
51 8, 10, or 12 digits, followed by optional .ss
52 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
54 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
55 8 or 10 digits, YY (if present) must be in the range 69-99
56 (PDS_TRAILING_YEAR | PDS_PRE_2000)
60 (PDS_TRAILING_YEAR | PDS_CENTURY)
65 year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
70 tm->tm_year = *digit_pair;
71 /* Deduce the century based on the year.
72 POSIX requires that 00-68 be interpreted as 2000-2068,
73 and that 69-99 be interpreted as 1969-1999. */
74 if (digit_pair[0] <= 68)
76 if (syntax_bits & PDS_PRE_2000)
83 if (! (syntax_bits & PDS_CENTURY))
85 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
93 /* Use current year. */
95 tmp = localtime (&now);
98 tm->tm_year = tmp->tm_year;
110 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
112 const char *dot = NULL;
117 size_t s_len = strlen (s);
118 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
122 if (len != 8 && len != 10 && len != 12)
127 if (!(syntax_bits & PDS_SECONDS))
130 if (s_len - len != 3)
134 for (i = 0; i < len; i++)
139 for (i = 0; i < len; i++)
140 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
143 if (syntax_bits & PDS_LEADING_YEAR)
145 if (year (tm, p, len - 4, syntax_bits))
151 /* Handle 8 digits worth of `MMDDhhmm'. */
152 tm->tm_mon = *p++ - 1;
158 /* Handle any trailing year. */
159 if (syntax_bits & PDS_TRAILING_YEAR)
161 if (year (tm, p, len, syntax_bits))
165 /* Handle seconds. */
175 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
177 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
179 tm->tm_sec = seconds;
185 /* Parse a POSIX-style date, returning true if successful. */
188 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
192 /* Placate gcc-4's -Wuninitialized.
193 posix_time_parse fails to set all of tm0 only when it returns
194 nonzero (due to year() returning nonzero), and in that case,
195 this code doesn't use the tm0 at all. */
203 if (posix_time_parse (&tm0, s, syntax_bits))
210 if (t != (time_t) -1)
214 /* mktime returns -1 for errors, but -1 is also a valid time_t
215 value. Check whether an error really occurred. */
221 /* Reject dates like "September 31" and times like "25:61". */
222 if ((tm0.tm_year ^ tm->tm_year)
223 | (tm0.tm_mon ^ tm->tm_mon)
224 | (tm0.tm_mday ^ tm->tm_mday)
225 | (tm0.tm_hour ^ tm->tm_hour)
226 | (tm0.tm_min ^ tm->tm_min)
227 | (tm0.tm_sec ^ tm->tm_sec))
234 #ifdef TEST_POSIXTIME
236 Test mainly with syntax_bits == 13
237 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
239 This test data assumes Universal Time, e.g., TZ="UTC0".
241 This test data also assumes that time_t is signed and is at least
242 39 bits wide, so that it can represent all years from 0000 through
243 9999. A host with 32-bit signed time_t can represent only time
244 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
245 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
246 cases outside this range will not work on such a host.
248 Also, the first two lines of test data assume that the current
252 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
253 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
254 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
255 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
256 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
257 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
258 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
259 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
260 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
261 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
262 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
263 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
264 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
265 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
266 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
267 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
268 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
269 197001000000.00 13 * *
270 197000010000.00 13 * *
271 197001010000.60 13 * *
272 197001010060.00 13 * *
273 197001012400.00 13 * *
274 197001320000.00 13 * *
275 197013010000.00 13 * *
276 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
277 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
278 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
279 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
280 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
281 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
282 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
283 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
284 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
285 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
286 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
287 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
288 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
289 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
290 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
295 # define MAX_BUFF_LEN 1024
300 char buff[MAX_BUFF_LEN + 1];
302 buff[MAX_BUFF_LEN] = 0;
303 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
305 char time_str[MAX_BUFF_LEN];
306 unsigned int syntax_bits;
308 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
312 printf ("%-15s %2u ", time_str, syntax_bits);
313 if (posixtime (&t, time_str, syntax_bits))
314 printf ("%12ld %s", (long int) t, ctime (&t));
316 printf ("%12s %s", "*", "*\n");
326 compile-command: "gcc -DTEST_POSIXTIME -g -O -Wall -W posixtm.c"