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/*
* Replacement for a missing setenv.
*
* Provides the same functionality as the standard library routine setenv for
* those platforms that don't have it.
*
* Written by Russ Allbery <rra@stanford.edu>
* This work is hereby placed in the public domain by its author.
*/
#include <config.h>
#include <portable/system.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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