As a complement to ungetc(), this C function pushes a string back onto an input stream, character by character. It returns the number of characters pushed, or -1 if an error occurred.
void ungets(char* str, FILE* stream) { if (!str || !file) return -1; size_t len = strlen(str); for (int i=len-1; i>=0; i--) if (ungetc(str[i], stream) == EOF) return -1; return len; }
