84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
|
|
* 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);
|
|
}
|