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#include <stdlib.h>
#include <string.h>
#include "libc.h"
char *__strchrnul(const char *, int);
static void dummy(char *old, char *new) {}
weak_alias(dummy, __env_rm_add);
int __putenv(char *s, size_t l, char *r)
{
size_t i=0;
if (__environ) {
for (char **e = __environ; *e; e++, i++)
if (!strncmp(s, *e, l+1)) {
char *tmp = *e;
*e = s;
__env_rm_add(tmp, r);
return 0;
}
}
static char **oldenv;
char **newenv;
if (__environ == oldenv) {
newenv = realloc(oldenv, sizeof *newenv * (i+2));
if (!newenv) goto oom;
} else {
newenv = malloc(sizeof *newenv * (i+2));
if (!newenv) goto oom;
if (i) memcpy(newenv, __environ, sizeof *newenv * i);
free(oldenv);
}
newenv[i] = s;
newenv[i+1] = 0;
__environ = oldenv = newenv;
if (r) __env_rm_add(0, r);
return 0;
oom:
free(r);
return -1;
}
int putenv(char *s)
{
size_t l = __strchrnul(s, '=') - s;
if (!l || !s[l]) return unsetenv(s);
return __putenv(s, l, 0);
}
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