1 /* Parse dates for touch and date.
3 Copyright (C) 1989-1991, 1998, 2000-2010 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
19 Rewritten by Jim Meyering. */
27 #include <sys/types.h>
31 # include "unlocked-io.h"
34 /* ISDIGIT differs from isdigit, as follows:
35 - Its arg may be any int or unsigned int; it need not be an unsigned char
37 - It's typically faster.
38 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
39 isdigit unless it's important to use the locale's definition
40 of `digit' even when the host does not conform to POSIX. */
41 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
46 touch -t [[CC]YY]mmddhhmm[.ss] FILE...
47 8, 10, or 12 digits, followed by optional .ss
48 (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
50 touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
51 8 or 10 digits, YY (if present) must be in the range 69-99
52 (PDS_TRAILING_YEAR | PDS_PRE_2000)
56 (PDS_TRAILING_YEAR | PDS_CENTURY)
61 year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
66 tm->tm_year = *digit_pair;
67 /* Deduce the century based on the year.
68 POSIX requires that 00-68 be interpreted as 2000-2068,
69 and that 69-99 be interpreted as 1969-1999. */
70 if (digit_pair[0] <= 68)
72 if (syntax_bits & PDS_PRE_2000)
79 if (! (syntax_bits & PDS_CENTURY))
81 tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
89 /* Use current year. */
91 tmp = localtime (&now);
94 tm->tm_year = tmp->tm_year;
106 posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
108 const char *dot = NULL;
113 size_t s_len = strlen (s);
114 size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
118 if (len != 8 && len != 10 && len != 12)
123 if (!(syntax_bits & PDS_SECONDS))
126 if (s_len - len != 3)
130 for (i = 0; i < len; i++)
135 for (i = 0; i < len; i++)
136 pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
139 if (syntax_bits & PDS_LEADING_YEAR)
141 if (year (tm, p, len - 4, syntax_bits))
147 /* Handle 8 digits worth of `MMDDhhmm'. */
148 tm->tm_mon = *p++ - 1;
154 /* Handle any trailing year. */
155 if (syntax_bits & PDS_TRAILING_YEAR)
157 if (year (tm, p, len, syntax_bits))
161 /* Handle seconds. */
171 if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
173 seconds = 10 * (dot[0] - '0') + dot[1] - '0';
175 tm->tm_sec = seconds;
181 /* Parse a POSIX-style date, returning true if successful. */
184 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
191 if (posix_time_parse (&tm0, s, syntax_bits))
198 if (t != (time_t) -1)
202 /* mktime returns -1 for errors, but -1 is also a valid time_t
203 value. Check whether an error really occurred. */
209 /* Reject dates like "September 31" and times like "25:61".
210 Do not reject times that specify "60" as the number of seconds. */
211 if ((tm0.tm_year ^ tm->tm_year)
212 | (tm0.tm_mon ^ tm->tm_mon)
213 | (tm0.tm_mday ^ tm->tm_mday)
214 | (tm0.tm_hour ^ tm->tm_hour)
215 | (tm0.tm_min ^ tm->tm_min)
216 | (tm0.tm_sec ^ tm->tm_sec))
218 /* Any mismatch without 60 in the tm_sec field is invalid. */
219 if (tm0.tm_sec != 60)
223 /* Allow times like 01:35:60 or 23:59:60. */
226 char *b = stpcpy (buf, s);
227 strcpy (b - 2, "59");
228 if (!posixtime (&dummy, buf, syntax_bits))