1 /* Parse dates for touch and date.
3 Copyright (C) 1989, 1990, 1991, 1998, 2000, 2001, 2002, 2003, 2004,
4 2005, 2006 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 <sys/time.h>
41 # include "unlocked-io.h"
44 /* ISDIGIT differs from isdigit, as follows:
45 - Its arg may be any int or unsigned int; it need not be an unsigned char
47 - It's typically faster.
48 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
49 isdigit unless it's important to use the locale's definition
50 of `digit' even when the host does not conform to POSIX. */
51 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
58 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
59 8, 10, or 12 digits, followed by optional .ss
60 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
62 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
63 8 or 10 digits, YY (if present) must be in the range 69-99
64 (PDS_TRAILING_YEAR | PDS_PRE_2000)
68 (PDS_TRAILING_YEAR | PDS_CENTURY)
73 year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
78 tm->tm_year = *digit_pair;
79 /* Deduce the century based on the year.
80 POSIX requires that 00-68 be interpreted as 2000-2068,
81 and that 69-99 be interpreted as 1969-1999. */
82 if (digit_pair[0] <= 68)
84 if (syntax_bits & PDS_PRE_2000)
91 if (! (syntax_bits & PDS_CENTURY))
93 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
101 /* Use current year. */
103 tmp = localtime (&now);
106 tm->tm_year = tmp->tm_year;
118 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
120 const char *dot = NULL;
125 size_t s_len = strlen (s);
126 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
130 if (len != 8 && len != 10 && len != 12)
135 if (!(syntax_bits & PDS_SECONDS))
138 if (s_len - len != 3)
142 for (i = 0; i < len; i++)
147 for (i = 0; i < len; i++)
148 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
151 if (syntax_bits & PDS_LEADING_YEAR)
153 if (year (tm, p, len - 4, syntax_bits))
159 /* Handle 8 digits worth of `MMDDhhmm'. */
160 tm->tm_mon = *p++ - 1;
166 /* Handle any trailing year. */
167 if (syntax_bits & PDS_TRAILING_YEAR)
169 if (year (tm, p, len, syntax_bits))
173 /* Handle seconds. */
183 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
185 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
187 tm->tm_sec = seconds;
193 /* Parse a POSIX-style date, returning true if successful. */
196 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
200 /* Placate gcc-4's -Wuninitialized.
201 posix_time_parse fails to set all of tm0 only when it returns
202 nonzero (due to year() returning nonzero), and in that case,
203 this code doesn't use the tm0 at all. */
211 if (posix_time_parse (&tm0, s, syntax_bits))
218 if (t != (time_t) -1)
222 /* mktime returns -1 for errors, but -1 is also a valid time_t
223 value. Check whether an error really occurred. */
229 /* Reject dates like "September 31" and times like "25:61". */
230 if ((tm0.tm_year ^ tm->tm_year)
231 | (tm0.tm_mon ^ tm->tm_mon)
232 | (tm0.tm_mday ^ tm->tm_mday)
233 | (tm0.tm_hour ^ tm->tm_hour)
234 | (tm0.tm_min ^ tm->tm_min)
235 | (tm0.tm_sec ^ tm->tm_sec))
242 #ifdef TEST_POSIXTIME
244 Test mainly with syntax_bits == 13
245 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
247 This test data assumes Universal Time, e.g., TZ="UTC0".
249 This test data also assumes that time_t is signed and is at least
250 39 bits wide, so that it can represent all years from 0000 through
251 9999. A host with 32-bit signed time_t can represent only time
252 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
253 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
254 cases outside this range will not work on such a host.
256 Also, the first two lines of test data assume that the current
260 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
261 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
262 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
263 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
264 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
265 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
266 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
267 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
268 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
269 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
270 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
271 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
272 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
273 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
274 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
275 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
276 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
277 197001000000.00 13 * *
278 197000010000.00 13 * *
279 197001010000.60 13 * *
280 197001010060.00 13 * *
281 197001012400.00 13 * *
282 197001320000.00 13 * *
283 197013010000.00 13 * *
284 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
285 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
286 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
287 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
288 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
289 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
290 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
291 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
292 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
293 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
294 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
295 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
296 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
297 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
298 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
303 # define MAX_BUFF_LEN 1024
308 char buff[MAX_BUFF_LEN + 1];
310 buff[MAX_BUFF_LEN] = 0;
311 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
313 char time_str[MAX_BUFF_LEN];
314 unsigned int syntax_bits;
316 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
320 printf ("%-15s %2u ", time_str, syntax_bits);
321 if (posixtime (&t, time_str, syntax_bits))
322 printf ("%12ld %s", (long int) t, ctime (&t));
324 printf ("%12s %s", "*", "*\n");
334 compile-command: "gcc -DTEST_POSIXTIME -g -O -Wall -W posixtm.c"