null-terminated the decoded base64 strings The returned size is still the same. I only alloced one byte more and filled it with zero. TODO: I'm not sure if the allocated size is exact. It's large enough but maybe too large.

FILE *peopen(const char *command, const char *type, char *const envp[], int *ret_pid);

FILE *peidopen(const char *command, const char *type, char *const envp[], int *ret_pid, uid_t uid, gid_t gid);