5 char *__strchrnul(const char *, int);
6 int __putenv(char *, size_t, char *);
8 void __env_rm_add(char *old, char *new)
10 static char **env_alloced;
11 static size_t env_alloced_n;
12 for (size_t i=0; i < env_alloced_n; i++)
13 if (env_alloced[i] == old) {
17 } else if (!env_alloced[i] && new) {
22 char **t = realloc(env_alloced, sizeof *t * (env_alloced_n+1));
24 (env_alloced = t)[env_alloced_n++] = new;
27 int setenv(const char *var, const char *value, int overwrite)
32 if (!var || !(l1 = __strchrnul(var, '=') - var) || var[l1]) {
36 if (!overwrite && getenv(var)) return 0;
43 memcpy(s+l1+1, value, l2+1);
44 return __putenv(s, l1, s);