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| | #include <stdlib.h>
#include <string.h>
#include <errno.h>
extern char **__environ;
extern char **__env_map;
int unsetenv(const char *name)
{
int i, j;
size_t l = strlen(name);
if (!*name || strchr(name, '=')) {
errno = EINVAL;
return -1;
}
again:
for (i=0; __environ[i] && (memcmp(name, __environ[i], l) || __environ[i][l] != '='); i++);
if (__environ[i]) {
if (__env_map) {
for (j=0; __env_map[j] && __env_map[j] != __environ[i]; j++);
free (__env_map[j]);
for (; __env_map[j]; j++)
__env_map[j] = __env_map[j+1];
}
for (; __environ[i]; i++)
__environ[i] = __environ[i+1];
goto again;
}
return 0;
}
|