add directory gnu
This commit is contained in:
gohigh
279
gnu/glibc/glibc-1.03/time/tzfile.c
Normal file
279
gnu/glibc/glibc-1.03/time/tzfile.c
Normal file
@@ -0,0 +1,279 @@
|
||||
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Library General Public License as
|
||||
published by the Free Software Foundation; either version 2 of the
|
||||
License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library 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
|
||||
Library General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Library General Public
|
||||
License along with the GNU C Library; see the file COPYING.LIB. If
|
||||
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||||
Cambridge, MA 02139, USA. */
|
||||
|
||||
#include <ansidecl.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
#include <time.h>
|
||||
#include <string.h>
|
||||
#include <limits.h>
|
||||
|
||||
#define NOID
|
||||
#include <tzfile.h>
|
||||
|
||||
#ifndef HAVE_GNU_LD
|
||||
#define __tzname tzname
|
||||
#define __daylight daylight
|
||||
#define __timezone timezone
|
||||
#endif
|
||||
|
||||
int __use_tzfile = 0;
|
||||
|
||||
struct ttinfo
|
||||
{
|
||||
long int offset; /* Seconds east of GMT. */
|
||||
unsigned char isdst; /* Used to set tm_isdst. */
|
||||
unsigned char idx; /* Index into `zone_names'. */
|
||||
unsigned char isstd; /* Transition times are standard time. */
|
||||
};
|
||||
|
||||
struct leap
|
||||
{
|
||||
time_t transition;
|
||||
long int change;
|
||||
};
|
||||
|
||||
static size_t num_transitions;
|
||||
static time_t *transitions = NULL;
|
||||
static unsigned char *type_idxs = NULL;
|
||||
static size_t num_types;
|
||||
static struct ttinfo *types = NULL;
|
||||
static char *zone_names = NULL;
|
||||
static size_t num_leaps;
|
||||
static struct leap *leaps = NULL;
|
||||
|
||||
#define uc2ul(x) _uc2ul((unsigned char *) (x))
|
||||
#define _uc2ul(x) \
|
||||
((x)[3] + ((x)[2] << CHAR_BIT) + ((x)[1] << (2 * CHAR_BIT)) + \
|
||||
((x)[0] << (3 * CHAR_BIT)))
|
||||
|
||||
void
|
||||
DEFUN(__tzfile_read, (file), CONST char *file)
|
||||
{
|
||||
size_t num_isstd;
|
||||
register FILE *f;
|
||||
struct tzhead tzhead;
|
||||
size_t chars;
|
||||
register size_t i;
|
||||
|
||||
__use_tzfile = 0;
|
||||
|
||||
if (transitions != NULL)
|
||||
free((PTR) transitions);
|
||||
transitions = NULL;
|
||||
if (type_idxs != NULL)
|
||||
free((PTR) type_idxs);
|
||||
type_idxs = NULL;
|
||||
if (types != NULL)
|
||||
free((PTR) types);
|
||||
types = NULL;
|
||||
if (zone_names != NULL)
|
||||
free((PTR) zone_names);
|
||||
zone_names = NULL;
|
||||
if (leaps != NULL)
|
||||
free((PTR) leaps);
|
||||
leaps = NULL;
|
||||
|
||||
if (file == NULL || *file == '\0')
|
||||
file = TZDEFAULT;
|
||||
|
||||
if (*file != '/')
|
||||
{
|
||||
static CONST char tzdir[] = TZDIR;
|
||||
register CONST unsigned int len = strlen(file) + 1;
|
||||
char *new = (char *) __alloca(sizeof(tzdir) + len);
|
||||
memcpy(new, tzdir, sizeof(tzdir) - 1);
|
||||
new[sizeof(tzdir) - 1] = '/';
|
||||
memcpy(&new[sizeof(tzdir)], file, len);
|
||||
file = new;
|
||||
}
|
||||
|
||||
f = fopen(file, "r");
|
||||
if (f == NULL)
|
||||
return;
|
||||
|
||||
if (fread((PTR) &tzhead, sizeof(tzhead), 1, f) != 1)
|
||||
goto lose;
|
||||
|
||||
num_transitions = (size_t) uc2ul(tzhead.tzh_timecnt);
|
||||
num_types = (size_t) uc2ul(tzhead.tzh_typecnt);
|
||||
chars = (size_t) uc2ul(tzhead.tzh_charcnt);
|
||||
num_leaps = (size_t) uc2ul(tzhead.tzh_leapcnt);
|
||||
num_isstd = (size_t) uc2ul(tzhead.tzh_ttisstdcnt);
|
||||
|
||||
if (num_transitions > 0)
|
||||
{
|
||||
transitions = (time_t *) malloc (num_transitions * sizeof(time_t));
|
||||
if (transitions == NULL)
|
||||
goto lose;
|
||||
type_idxs = (unsigned char *) malloc (num_transitions);
|
||||
if (type_idxs == NULL)
|
||||
goto lose;
|
||||
}
|
||||
if (num_types > 0)
|
||||
{
|
||||
types = (struct ttinfo *) malloc (num_types * sizeof (struct ttinfo));
|
||||
if (types == NULL)
|
||||
goto lose;
|
||||
}
|
||||
if (chars > 0)
|
||||
{
|
||||
zone_names = (char *) malloc (chars);
|
||||
if (zone_names == NULL)
|
||||
goto lose;
|
||||
}
|
||||
if (num_leaps > 0)
|
||||
{
|
||||
leaps = (struct leap *) malloc (num_leaps * sizeof (struct leap));
|
||||
if (leaps == NULL)
|
||||
goto lose;
|
||||
}
|
||||
|
||||
if (fread((PTR) transitions, sizeof(time_t),
|
||||
num_transitions, f) != num_transitions ||
|
||||
fread((PTR) type_idxs, 1, num_transitions, f) != num_transitions)
|
||||
goto lose;
|
||||
|
||||
for (i = 0; i < num_transitions; ++i)
|
||||
transitions[i] = uc2ul (&transitions[i]);
|
||||
|
||||
for (i = 0; i < num_types; ++i)
|
||||
{
|
||||
unsigned char x[4];
|
||||
if (fread((PTR) x, 1, 4, f) != 4 ||
|
||||
fread((PTR) &types[i].isdst, 1, 1, f) != 1 ||
|
||||
fread((PTR) &types[i].idx, 1, 1, f) != 1)
|
||||
goto lose;
|
||||
types[i].offset = (long int) uc2ul(x);
|
||||
}
|
||||
|
||||
if (fread((PTR) zone_names, 1, chars, f) != chars)
|
||||
goto lose;
|
||||
|
||||
for (i = 0; i < num_leaps; ++i)
|
||||
{
|
||||
unsigned char x[4];
|
||||
if (fread((PTR) x, 1, sizeof(x), f) != sizeof(x))
|
||||
goto lose;
|
||||
leaps[i].transition = (time_t) uc2ul(x);
|
||||
if (fread((PTR) x, 1, sizeof(x), f) != sizeof(x))
|
||||
goto lose;
|
||||
leaps[i].change = (long int) uc2ul(x);
|
||||
}
|
||||
|
||||
for (i = 0; i < num_isstd; ++i)
|
||||
{
|
||||
char c = getc(f);
|
||||
if (c == EOF)
|
||||
goto lose;
|
||||
types[i].isstd = c != 0;
|
||||
}
|
||||
while (i < num_types)
|
||||
types[i++].isstd = 0;
|
||||
|
||||
(void) fclose(f);
|
||||
__use_tzfile = 1;
|
||||
return;
|
||||
|
||||
lose:;
|
||||
(void) fclose(f);
|
||||
}
|
||||
|
||||
void
|
||||
DEFUN(__tzfile_default, (std, dst, stdoff, dstoff),
|
||||
char *std AND char *dst AND
|
||||
long int stdoff AND long int dstoff)
|
||||
{
|
||||
size_t stdlen, dstlen;
|
||||
|
||||
__tzfile_read (TZDEFRULES);
|
||||
if (!__use_tzfile)
|
||||
return;
|
||||
|
||||
if (num_types != 2)
|
||||
{
|
||||
__use_tzfile = 0;
|
||||
return;
|
||||
}
|
||||
|
||||
free (zone_names);
|
||||
|
||||
stdlen = strlen (std) + 1;
|
||||
dstlen = strlen (dst) + 1;
|
||||
zone_names = malloc (stdlen + dstlen);
|
||||
if (zone_names == NULL)
|
||||
{
|
||||
__use_tzfile = 0;
|
||||
return;
|
||||
}
|
||||
memcpy (zone_names, std, stdlen);
|
||||
memcpy (&zone_names[stdlen], dst, dstlen);
|
||||
|
||||
types[0].idx = 0;
|
||||
types[0].isdst = 0;
|
||||
if (std[0] != '\0')
|
||||
types[0].offset = stdoff;
|
||||
types[1].idx = stdlen;
|
||||
types[1].isdst = 1;
|
||||
if (dst[0] != '\0')
|
||||
types[1].offset = dstoff;
|
||||
}
|
||||
|
||||
int
|
||||
DEFUN(__tzfile_compute, (timer, tm), time_t timer AND struct tm tm)
|
||||
{
|
||||
struct ttinfo *info;
|
||||
register size_t i;
|
||||
|
||||
if (num_transitions == 0 || timer < transitions[0])
|
||||
{
|
||||
/* TIMER is before any transition (or there are no transitions).
|
||||
Choose the first non-DST type
|
||||
(or the first if they're all DST types). */
|
||||
i = 0;
|
||||
while (i < num_types && types[i].isdst)
|
||||
++i;
|
||||
if (i == num_types)
|
||||
i = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Find the first transition after TIMER, and then go back one. */
|
||||
i = 1;
|
||||
while (i < num_transitions && transitions[i] < timer)
|
||||
++i;
|
||||
--i;
|
||||
}
|
||||
|
||||
info = &types[type_idxs[i]];
|
||||
__daylight = info->isdst;
|
||||
__timezone = info->offset;
|
||||
for (i = 0; i < num_types && i < sizeof (__tzname) / sizeof (__tzname[0]);
|
||||
++i)
|
||||
__tzname[types[i].isdst] = &zone_names[types[i].idx];
|
||||
if (info->isdst < sizeof (__tzname) / sizeof (__tzname[0]))
|
||||
__tzname[info->isdst] = &zone_names[info->idx];
|
||||
|
||||
i = num_leaps;
|
||||
do
|
||||
if (i-- == 0)
|
||||
return 1;
|
||||
while (timer < leaps[i].transition);
|
||||
__timezone += leaps[i].change;
|
||||
return 1;
|
||||
}
|
||||
Reference in New Issue
Block a user