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/* $Id: setenv.c 6693 2004-03-08 20:41:13Z rra $
**
** Replacement for a missing setenv.
**
** Written by Russ Allbery <rra@stanford.edu>
** This work is hereby placed in the public domain by its author.
**
** Provides the same functionality as the standard library routine setenv
** for those platforms that don't have it.
*/
#include "config.h"
#include "clibrary.h"
/* If we're running the test suite, rename setenv to avoid conflicts with
the system version. */
#if TESTING
# define setenv test_setenv
int test_setenv(const char *, const char *, int);
#endif
int
setenv(const char *name, const char *value, int overwrite)
{
char *envstring;
size_t size;
if (!overwrite && getenv(name) != NULL)
return 0;
/* Allocate memory for the environment string. We intentionally don't
use concat here, or the xmalloc family of allocation routines, since
the intention is to provide a replacement for the standard library
function which sets errno and returns in the event of a memory
allocation failure. */
size = strlen(name) + 1 + strlen(value) + 1;
envstring = malloc(size);
if (envstring == NULL)
return -1;
/* Build the environment string and add it to the environment using
putenv. Systems without putenv lose, but XPG4 requires it. */
strlcpy(envstring, name, size);
strlcat(envstring, "=", size);
strlcat(envstring, value, size);
return putenv(envstring);
/* Note that the memory allocated is not freed. This is intentional;
many implementations of putenv assume that the string passed to
putenv will never be freed and don't make a copy of it. Repeated use
of this function will therefore leak memory, since most
implementations of putenv also don't free strings removed from the
environment (due to being overwritten). */
}
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