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#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
extern char **__environ;
char **__env_map;
int __putenv(char *s, int a)
{
int i=0, j=0;
char *end = strchr(s, '=');
size_t l = end-s+1;
char **newenv = 0;
char **newmap = 0;
static char **oldenv;
if (!end || l == 1) return -1;
for (; __environ[i] && memcmp(s, __environ[i], l); i++);
if (a) {
if (!__env_map) {
__env_map = calloc(2, sizeof(char *));
if (__env_map) __env_map[0] = s;
} else {
for (; __env_map[j] && __env_map[j] != __environ[i]; j++);
if (!__env_map[j]) {
newmap = realloc(__env_map, sizeof(char *)*(j+2));
if (newmap) {
__env_map = newmap;
__env_map[j] = s;
__env_map[j+1] = NULL;
}
} else {
free(__env_map[j]);
}
}
}
if (!__environ[i]) {
newenv = malloc(sizeof(char *)*(i+2));
if (!newenv) {
if (a && __env_map) __env_map[j] = 0;
return -1;
}
memcpy(newenv, __environ, sizeof(char *)*i);
newenv[i] = s;
newenv[i+1] = 0;
__environ = newenv;
free(oldenv);
oldenv = __environ;
}
__environ[i] = s;
return 0;
}
int putenv(char *s)
{
return __putenv(s, 0);
}
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