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timezones.c
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timezones.c
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/*
* Copyright (c) 1994-2012 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include "timezones.h"
extern int verbose;
#define MAX_TZ_STACK 5
static int n_tz_stack = 0;
static char *tz_stack[MAX_TZ_STACK];
static inline void xxputenv(char *s, const char *f)
{
if (verbose > 1)
fprintf(stderr, "\n%s:putenv(\"%s\")\n", f, s);
putenv(s);
}
#define putenv(s) xxputenv((s), __FUNCTION__)
static char *stash_tz(const char *tz)
{
char *s = malloc(4+(tz == NULL ? 0 : strlen(tz)));
assert(s);
sprintf(s, "TZ=%s", (tz == NULL ? "" : tz));
assert(n_tz_stack < MAX_TZ_STACK-1);
return tz_stack[n_tz_stack++] = s;
}
void push_tz(const char *tz)
{
if (n_tz_stack == 0)
stash_tz(getenv("TZ"));
putenv(stash_tz(tz));
tzset();
}
void pop_tz(void)
{
char *old;
assert(n_tz_stack > 1);
old = tz_stack[--n_tz_stack];
putenv(tz_stack[n_tz_stack-1]);
tzset();
free(old);
}
void restore_tz(void)
{
while (n_tz_stack > 1)
pop_tz();
}

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Sat, Apr 4, 1:38 AM (1 w, 5 d ago)
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timezones.c (2 KB)

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