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/* Parse dates for touch and date.
Copyright (C) 1989-1991, 1998, 2000-2023 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
/* Yacc-based version written by Jim Kingdon and David MacKenzie.
Rewritten by Jim Meyering. */
#include <config.h>
#include "posixtm.h"
#include "c-ctype.h"
#include "idx.h"
#include "verify.h"
#include <stdckdint.h>
#include <string.h>
/*
POSIX requires:
touch -t [[CC]YY]mmddhhmm[.ss] FILE...
8, 10, or 12 digits, followed by optional .ss
(PDS_CENTURY | PDS_SECONDS)
touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
8 or 10 digits, YY (if present) must be in the range 69-99
(PDS_TRAILING_YEAR | PDS_PRE_2000)
date mmddhhmm[[CC]YY]
8, 10, or 12 digits
(PDS_TRAILING_YEAR | PDS_CENTURY)
*/
static bool
year (struct tm *tm, const int *digit_pair, idx_t n, unsigned int syntax_bits)
{
switch (n)
{
case 1:
tm->tm_year = *digit_pair;
/* Deduce the century based on the year.
POSIX requires that 00-68 be interpreted as 2000-2068,
and that 69-99 be interpreted as 1969-1999. */
if (digit_pair[0] <= 68)
{
if (syntax_bits & PDS_PRE_2000)
return false;
tm->tm_year += 100;
}
break;
case 2:
if (! (syntax_bits & PDS_CENTURY))
return false;
tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
break;
case 0:
{
/* Use current year. */
time_t now = time (NULL);
struct tm *tmp = localtime (&now);
if (! tmp)
return false;
tm->tm_year = tmp->tm_year;
}
break;
default:
assume (false);
}
return true;
}
static bool
posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
{
const char *dot = NULL;
int pair[6];
idx_t s_len = strlen (s);
idx_t len = s_len;
if (syntax_bits & PDS_SECONDS)
{
dot = strchr (s, '.');
if (dot)
{
len = dot - s;
if (s_len - len != 3)
return false;
}
}
if (! (8 <= len && len <= 12 && len % 2 == 0))
return false;
for (idx_t i = 0; i < len; i++)
if (!c_isdigit (s[i]))
return false;
len /= 2;
for (idx_t i = 0; i < len; i++)
pair[i] = 10 * (s[2*i] - '0') + s[2*i + 1] - '0';
int *p = pair;
if (! (syntax_bits & PDS_TRAILING_YEAR))
{
if (! year (tm, p, len - 4, syntax_bits))
return false;
p += len - 4;
len = 4;
}
/* Handle 8 digits worth of 'MMDDhhmm'. */
tm->tm_mon = *p++ - 1;
tm->tm_mday = *p++;
tm->tm_hour = *p++;
tm->tm_min = *p++;
len -= 4;
/* Handle any trailing year. */
if (syntax_bits & PDS_TRAILING_YEAR)
{
if (! year (tm, p, len, syntax_bits))
return false;
}
/* Handle seconds. */
if (!dot)
tm->tm_sec = 0;
else if (c_isdigit (dot[1]) && c_isdigit (dot[2]))
tm->tm_sec = 10 * (dot[1] - '0') + dot[2] - '0';
else
return false;
return true;
}
/* Parse a POSIX-style date, returning true if successful. */
bool
posixtime (time_t *p, const char *s, unsigned int syntax_bits)
{
struct tm tm0;
bool leapsec = false;
if (! posix_time_parse (&tm0, s, syntax_bits))
return false;
while (true)
{
struct tm tm1;
tm1.tm_sec = tm0.tm_sec;
tm1.tm_min = tm0.tm_min;
tm1.tm_hour = tm0.tm_hour;
tm1.tm_mday = tm0.tm_mday;
tm1.tm_mon = tm0.tm_mon;
tm1.tm_year = tm0.tm_year;
tm1.tm_wday = -1;
tm1.tm_isdst = -1;
time_t t = mktime (&tm1);
if (tm1.tm_wday < 0)
return false;
/* Reject dates like "September 31" and times like "25:61".
However, allow a seconds count of 60 even in time zones that do
not support leap seconds, treating it as the following second;
POSIX requires this. */
if (! ((tm0.tm_year ^ tm1.tm_year)
| (tm0.tm_mon ^ tm1.tm_mon)
| (tm0.tm_mday ^ tm1.tm_mday)
| (tm0.tm_hour ^ tm1.tm_hour)
| (tm0.tm_min ^ tm1.tm_min)
| (tm0.tm_sec ^ tm1.tm_sec)))
{
if (ckd_add (&t, t, leapsec))
return false;
*p = t;
return true;
}
/* Any mismatch without 60 in the tm_sec field is invalid. */
if (tm0.tm_sec != 60)
return false;
/* Allow times like 01:35:60 or 23:59:60. */
tm0.tm_sec = 59;
leapsec = true;
}
}
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