1 /* Parse dates for touch and date.
2 Copyright (C) 1989, 1990, 1991, 1998, 2000-2003 Free Software Foundation Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
19 Rewritten by Jim Meyering. */
31 #include <sys/types.h>
39 # include <sys/time.h>
45 #include "unlocked-io.h"
47 /* ISDIGIT differs from isdigit, as follows:
48 - Its arg may be any int or unsigned int; it need not be an unsigned char.
49 - It's guaranteed to evaluate its argument exactly once.
50 - It's typically faster.
51 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
52 ISDIGIT_LOCALE unless it's important to use the locale's definition
53 of `digit' even when the host does not conform to POSIX. */
54 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
61 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
62 8, 10, or 12 digits, followed by optional .ss
63 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
65 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
71 (PDS_TRAILING_YEAR | PDS_CENTURY)
76 year (struct tm *tm, const int *digit_pair, size_t n, int allow_century)
81 tm->tm_year = *digit_pair;
82 /* Deduce the century based on the year.
83 POSIX requires that 00-68 be interpreted as 2000-2068,
84 and that 69-99 be interpreted as 1969-1999. */
85 if (digit_pair[0] <= 68)
92 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
100 /* Use current year. */
102 tmp = localtime (&now);
105 tm->tm_year = tmp->tm_year;
117 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
119 const char *dot = NULL;
124 size_t s_len = strlen (s);
125 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
129 if (len != 8 && len != 10 && len != 12)
134 if (!(syntax_bits & PDS_SECONDS))
137 if (s_len - len != 3)
141 for (i = 0; i < len; i++)
146 for (i = 0; i < len; i++)
147 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
150 if (syntax_bits & PDS_LEADING_YEAR)
152 if (year (tm, p, len - 4, syntax_bits & PDS_CENTURY))
158 /* Handle 8 digits worth of `MMDDhhmm'. */
159 tm->tm_mon = *p++ - 1;
165 /* Handle any trailing year. */
166 if (syntax_bits & PDS_TRAILING_YEAR)
168 if (year (tm, p, len, syntax_bits & PDS_CENTURY))
172 /* Handle seconds. */
182 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
184 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
186 tm->tm_sec = seconds;
192 /* Parse a POSIX-style date, returning true if successful. */
195 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
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) t, ctime (&t));
315 printf ("%12s %s", "*", "*\n");
325 compile-command: "gcc -DTEST_POSIXTIME -DHAVE_CONFIG_H -I.. -g -O -Wall -W posixtm.c"