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#include <stdlib.h>
#include <string.h>
#include <errno.h>
int __putenv(char *s, int a);
int setenv(const char *var, const char *value, int overwrite)
{
char *s;
int l1, l2;
if (!var || !*var || strchr(var, '=')) {
errno = EINVAL;
return -1;
}
if (!overwrite && getenv(var)) return 0;
l1 = strlen(var);
l2 = strlen(value);
s = malloc(l1+l2+2);
if (s) {
memcpy(s, var, l1);
s[l1] = '=';
memcpy(s+l1+1, value, l2);
s[l1+l2+1] = 0;
if (!__putenv(s, 1)) return 0;
}
free(s);
return -1;
}
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