1 /* Parse dates for touch and date.
2 Copyright (C) 1989, 1990, 1991, 1998, 2000-2002 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. */
28 typedef enum {false = 0, true = 1} bool;
35 #include <sys/types.h>
43 # include <sys/time.h>
49 #include "unlocked-io.h"
51 /* ISDIGIT differs from isdigit, as follows:
52 - Its arg may be any int or unsigned int; it need not be an unsigned char.
53 - It's guaranteed to evaluate its argument exactly once.
54 - It's typically faster.
55 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
56 ISDIGIT_LOCALE unless it's important to use the locale's definition
57 of `digit' even when the host does not conform to POSIX. */
58 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
65 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
66 8, 10, or 12 digits, followed by optional .ss
67 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
69 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
75 (PDS_TRAILING_YEAR | PDS_CENTURY)
80 year (struct tm *tm, const int *digit_pair, size_t n, int allow_century)
85 tm->tm_year = *digit_pair;
86 /* Deduce the century based on the year.
87 POSIX requires that 00-68 be interpreted as 2000-2068,
88 and that 69-99 be interpreted as 1969-1999. */
89 if (digit_pair[0] <= 68)
96 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
104 /* Use current year. */
106 tmp = localtime (&now);
109 tm->tm_year = tmp->tm_year;
121 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
123 const char *dot = NULL;
128 size_t s_len = strlen (s);
129 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
133 if (len != 8 && len != 10 && len != 12)
138 if (!(syntax_bits & PDS_SECONDS))
141 if (s_len - len != 3)
145 for (i = 0; i < len; i++)
150 for (i = 0; i < len; i++)
151 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
154 if (syntax_bits & PDS_LEADING_YEAR)
156 if (year (tm, p, len - 4, syntax_bits & PDS_CENTURY))
162 /* Handle 8 digits worth of `MMDDhhmm'. */
163 tm->tm_mon = *p++ - 1;
169 /* Handle any trailing year. */
170 if (syntax_bits & PDS_TRAILING_YEAR)
172 if (year (tm, p, len, syntax_bits & PDS_CENTURY))
176 /* Handle seconds. */
186 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
188 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
190 tm->tm_sec = seconds;
196 /* Parse a POSIX-style date, returning true if successful. */
199 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
206 if (posix_time_parse (&tm0, s, syntax_bits))
213 if (t != (time_t) -1)
217 /* mktime returns -1 for errors, but -1 is also a valid time_t
218 value. Check whether an error really occurred. */
224 /* Reject dates like "September 31" and times like "25:61". */
225 if ((tm0.tm_year ^ tm->tm_year)
226 | (tm0.tm_mon ^ tm->tm_mon)
227 | (tm0.tm_mday ^ tm->tm_mday)
228 | (tm0.tm_hour ^ tm->tm_hour)
229 | (tm0.tm_min ^ tm->tm_min)
230 | (tm0.tm_sec ^ tm->tm_sec))
237 #ifdef TEST_POSIXTIME
239 Test mainly with syntax_bits == 13
240 (aka: (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
242 This test data assumes Universal Time, e.g., TZ="UTC0".
244 This test data also assumes that time_t is signed and is at least
245 39 bits wide, so that it can represent all years from 0000 through
246 9999. A host with 32-bit signed time_t can represent only time
247 stamps in the range 1901-12-13 20:45:52 through 2038-01-18
248 03:14:07 UTC, assuming POSIX time_t with no leap seconds, so test
249 cases outside this range will not work on such a host.
251 Also, the first two lines of test data assume that the current
255 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
256 12131415.16 13 1039788916 Fri Dec 13 14:15:16 2002
257 000001010000.00 13 -62167132800 Sun Jan 1 00:00:00 0000
258 190112132045.52 13 -2147483648 Fri Dec 13 20:45:52 1901
259 190112132045.53 13 -2147483647 Fri Dec 13 20:45:53 1901
260 190112132046.52 13 -2147483588 Fri Dec 13 20:46:52 1901
261 190112132145.52 13 -2147480048 Fri Dec 13 21:45:52 1901
262 190112142045.52 13 -2147397248 Sat Dec 14 20:45:52 1901
263 190201132045.52 13 -2144805248 Mon Jan 13 20:45:52 1902
264 196912312359.59 13 -1 Wed Dec 31 23:59:59 1969
265 197001010000.00 13 0 Thu Jan 1 00:00:00 1970
266 197001010000.01 13 1 Thu Jan 1 00:00:01 1970
267 197001010001.00 13 60 Thu Jan 1 00:01:00 1970
268 197001010100.00 13 3600 Thu Jan 1 01:00:00 1970
269 197001020000.00 13 86400 Fri Jan 2 00:00:00 1970
270 197002010000.00 13 2678400 Sun Feb 1 00:00:00 1970
271 197101010000.00 13 31536000 Fri Jan 1 00:00:00 1971
272 197001000000.00 13 * *
273 197000010000.00 13 * *
274 197001010000.60 13 * *
275 197001010060.00 13 * *
276 197001012400.00 13 * *
277 197001320000.00 13 * *
278 197013010000.00 13 * *
279 203801190314.06 13 2147483646 Tue Jan 19 03:14:06 2038
280 203801190314.07 13 2147483647 Tue Jan 19 03:14:07 2038
281 203801190314.08 13 2147483648 Tue Jan 19 03:14:08 2038
282 999912312359.59 13 253402300799 Fri Dec 31 23:59:59 9999
283 1112131415 13 1323785700 Tue Dec 13 14:15:00 2011
284 1112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
285 201112131415.16 13 1323785716 Tue Dec 13 14:15:16 2011
286 191112131415.16 13 -1831974284 Wed Dec 13 14:15:16 1911
287 203712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
288 3712131415.16 13 2144326516 Sun Dec 13 14:15:16 2037
289 6812131415.16 13 3122633716 Thu Dec 13 14:15:16 2068
290 6912131415.16 13 -1590284 Sat Dec 13 14:15:16 1969
291 7012131415.16 13 29945716 Sun Dec 13 14:15:16 1970
292 1213141599 2 945094500 Mon Dec 13 14:15:00 1999
293 1213141500 2 976716900 Wed Dec 13 14:15:00 2000
298 # define MAX_BUFF_LEN 1024
303 char buff[MAX_BUFF_LEN + 1];
305 buff[MAX_BUFF_LEN] = 0;
306 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
308 char time_str[MAX_BUFF_LEN];
309 unsigned int syntax_bits;
311 if (sscanf (buff, "%s %u", time_str, &syntax_bits) != 2)
315 printf ("%-15s %2u ", time_str, syntax_bits);
316 if (posixtime (&t, time_str, syntax_bits))
317 printf ("%12ld %s", (long) t, ctime (&t));
319 printf ("%12s %s", "*", "*\n");
329 compile-command: "gcc -DTEST_POSIXTIME -DHAVE_CONFIG_H -I.. -g -O -Wall -W posixtm.c"