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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.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
*
* The authors hereby relinquish any claim to any copyright that they may have
* in this work, whether granted under contract or by operation of law or
* international treaty, and hereby commit to the public, at large, that they
* shall not, at any time in the future, seek to enforce any copyright in this
* work against any person or entity, or prevent any person or entity from
* copying, publishing, distributing or creating derivative works of this
* work.
*/
#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
* the xmalloc family of allocation routines here, since the intention is
* to provide a replacement for the standard library function that 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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