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/* Parse dates for touch.
Copyright (C) 1989, 1990, 1991, 1998 Free Software Foundation Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Yacc-based version written by Jim Kingdon and David MacKenzie.
Rewritten by Jim Meyering. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#if HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
#ifdef TM_IN_SYS_TIME
# include <sys/time.h>
#else
# include <time.h>
#endif
#include "posixtm.h"
/* ISDIGIT differs from isdigit, as follows:
- Its arg may be any int or unsigned int; it need not be an unsigned char.
- It's guaranteed to evaluate its argument exactly once.
- It's typically faster.
Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
only '0' through '9' are digits. Prefer ISDIGIT to isdigit unless
it's important to use the locale's definition of `digit' even when the
host does not conform to Posix. */
#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
/* The return value. */
static struct tm t;
time_t mktime ();
/*
POSIX requires:
touch -t [[CC]YY]mmddhhmm[.ss] FILE...
8, 10, or 12 digits, followed by optional .ss
(PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
touch mmddhhmm[YY] FILE... (obsolescent)
8 or 10 digits
(PDS_TRAILING_YEAR)
date mmddhhmm[[CC]YY]
8, 10, or 12 digits
(PDS_TRAILING_YEAR | PDS_CENTURY)
*/
static int
year (const int *digit_pair, size_t n, int allow_century)
{
switch (n)
{
case 1:
t.tm_year = *digit_pair;
/* Deduce the century based on the year.
See POSIX.2 section 4.63.3. */
if (digit_pair[0] <= 68)
t.tm_year += 100;
break;
case 2:
if (!allow_century)
return 1;
t.tm_year = digit_pair[0] * 100 + digit_pair[1];
if (t.tm_year < 1900)
return 1;
t.tm_year -= 1900;
break;
case 0:
{
time_t now;
struct tm *tmp;
/* Use current year. */
time (&now);
tmp = localtime (&now);
t.tm_year = tmp->tm_year;
}
break;
default:
abort ();
}
return 0;
}
static int
posix_time_parse (const char *s, unsigned int syntax_bits)
{
const char *dot = NULL;
int pair[6];
int *p;
int i;
size_t s_len = strlen (s);
size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
? dot - s
: s_len);
if (len != 8 && len != 10 && len != 12)
return 1;
if (dot)
{
if (!(syntax_bits & PDS_SECONDS))
return 1;
if (s_len - len != 3)
return 1;
}
for (i = 0; i < len; i++)
if (!ISDIGIT (s[i]))
return 1;
len /= 2;
for (i = 0; i < len; i++)
pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
p = pair;
if (syntax_bits & PDS_LEADING_YEAR)
{
if (year (p, len - 4, syntax_bits & PDS_CENTURY))
return 1;
p += len - 4;
len = 4;
}
/* Handle 8 digits worth of `MMDDhhmm'. */
if (*p < 1 || *p > 12)
return 1;
t.tm_mon = *p - 1;
++p; --len;
if (*p < 1 || *p > 31)
return 1;
t.tm_mday = *p;
++p; --len;
if (*p < 0 || *p > 23)
return 1;
t.tm_hour = *p;
++p; --len;
if (*p < 0 || *p > 59)
return 1;
t.tm_min = *p;
/* Handle any trailing year. */
if (syntax_bits & PDS_TRAILING_YEAR)
{
if (year (p, len, syntax_bits & PDS_CENTURY))
return 1;
}
/* Handle seconds. */
if (!dot)
{
t.tm_sec = 0;
}
else
{
int seconds;
++dot;
if (!ISDIGIT (dot[0]) || !ISDIGIT (dot[1]))
return 1;
seconds = 10 * (dot[0] - '0') + dot[1] - '0';
if (seconds < 0 || seconds > 61)
return 1;
t.tm_sec = seconds;
}
return 0;
}
/* Parse a POSIX-style date and return it, or (time_t)-1 for an error. */
time_t
posixtime (const char *s, unsigned int syntax_bits)
{
t.tm_isdst = -1;
if (posix_time_parse (s, syntax_bits))
return (time_t)-1;
else
return mktime (&t);
}
/* Parse a POSIX-style date and return it, or NULL for an error. */
struct tm *
posixtm (const char *s, unsigned int syntax_bits)
{
if (posixtime (s, syntax_bits) == -1)
return NULL;
return &t;
}
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