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
49 - It's typically faster.
50 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
51 isdigit 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)
65 8 or 10 digits, YY (if present) must be in the range 69-99
66 (PDS_TRAILING_YEAR | PDS_PRE_2000)
70 (PDS_TRAILING_YEAR | PDS_CENTURY)
75 year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
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)
86 if (syntax_bits & PDS_PRE_2000)
93 if (! (syntax_bits & PDS_CENTURY))
95 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
103 /* Use current year. */
105 tmp = localtime (&now);
108 tm->tm_year = tmp->tm_year;
120 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
122 const char *dot = NULL;
127 size_t s_len = strlen (s);
128 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
132 if (len != 8 && len != 10 && len != 12)
137 if (!(syntax_bits & PDS_SECONDS))
140 if (s_len - len != 3)
144 for (i = 0; i < len; i++)
149 for (i = 0; i < len; i++)
150 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
153 if (syntax_bits & PDS_LEADING_YEAR)
155 if (year (tm, p, len - 4, syntax_bits))
161 /* Handle 8 digits worth of `MMDDhhmm'. */
162 tm->tm_mon = *p++ - 1;
168 /* Handle any trailing year. */
169 if (syntax_bits & PDS_TRAILING_YEAR)
171 if (year (tm, p, len, syntax_bits))
175 /* Handle seconds. */
185 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
187 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
189 tm->tm_sec = seconds;
195 /* Parse a POSIX-style date, returning true if successful. */
198 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
202 /* Placate gcc-4's -Wuninitialized.
203 posix_time_parse fails to set all of tm0 only when it returns
204 nonzero (due to year() returning nonzero), and in that case,
205 this code doesn't use the tm0 at all. */
213 if (posix_time_parse (&tm0, s, syntax_bits))
220 if (t != (time_t) -1)
224 /* mktime returns -1 for errors, but -1 is also a valid time_t
225 value. Check whether an error really occurred. */
231 /* Reject dates like "September 31" and times like "25:61". */
232 if ((tm0.tm_year ^ tm->tm_year)
233 | (tm0.tm_mon ^ tm->tm_mon)
234 | (tm0.tm_mday ^ tm->tm_mday)
235 | (tm0.tm_hour ^ tm->tm_hour)
236 | (tm0.tm_min ^ tm->tm_min)
237 | (tm0.tm_sec ^ tm->tm_sec))
244 #ifdef TEST_POSIXTIME
246 Test mainly with syntax_bits == 13
247 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
249 This test data assumes Universal Time, e.g., TZ="UTC0".
251 This test data also assumes that time_t is signed and is at least
252 39 bits wide, so that it can represent all years from 0000 through
253 9999. A host with 32-bit signed time_t can represent only time
254 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
255 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
256 cases outside this range will not work on such a host.
258 Also, the first two lines of test data assume that the current
262 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
263 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
264 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
265 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
266 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
267 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
268 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
269 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
270 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
271 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
272 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
273 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
274 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
275 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
276 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
277 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
278 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
279 197001000000.00 13 * *
280 197000010000.00 13 * *
281 197001010000.60 13 * *
282 197001010060.00 13 * *
283 197001012400.00 13 * *
284 197001320000.00 13 * *
285 197013010000.00 13 * *
286 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
287 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
288 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
289 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
290 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
291 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
292 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
293 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
294 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
295 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
296 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
297 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
298 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
299 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
300 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
305 # define MAX_BUFF_LEN 1024
310 char buff[MAX_BUFF_LEN + 1];
312 buff[MAX_BUFF_LEN] = 0;
313 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
315 char time_str[MAX_BUFF_LEN];
316 unsigned int syntax_bits;
318 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
322 printf ("%-15s %2u ", time_str, syntax_bits);
323 if (posixtime (&t, time_str, syntax_bits))
324 printf ("%12ld %s", (long int) t, ctime (&t));
326 printf ("%12s %s", "*", "*\n");
336 compile-command: "gcc -DTEST_POSIXTIME -DHAVE_CONFIG_H -I.. -g -O -Wall -W posixtm.c"