/*
* Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, 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 <config.h>
#include <sys/types.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
# include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#include <errno.h>
#include "missing.h"
int
setenv(const char *var, const char *val, int overwrite)
{
char *envstr, *dst;
const char *src;
size_t esize;
if (!var || *var == '\0') {
errno = EINVAL;
return -1;
}
/*
* POSIX says a var name with '=' is an error but BSD
* just ignores the '=' and anything after it.
*/
for (src = var; *src != '\0' && *src != '='; src++)
;
esize = (size_t)(src - var) + 2;
if (val) {
esize += strlen(val); /* glibc treats a NULL val as "" */
}
/* Allocate and fill in envstr. */
if ((envstr = malloc(esize)) == NULL)
return -1;
for (src = var, dst = envstr; *src != '\0' && *src != '=';)
*dst++ = *src++;
*dst++ = '=';
if (val) {
for (src = val; *src != '\0';)
*dst++ = *src++;
}
*dst = '\0';
if (!overwrite && getenv(var) != NULL) {
free(envstr);
return 0;
}
return putenv(envstr);
}
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