1 /* Parse dates for touch and date.
3 Copyright (C) 1989-1991, 1998, 2000-2013 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))