blob: c4257d130428576c2cf4952d12464f8873086189 [file] [log] [blame]
// RUN: %clangxx -g %s -o %t && %run %t
#include <assert.h>
#include <stdio.h>
int main(int argc, char **argv) {
FILE *fp = fopen(argv[0], "r");
// the file should be at least one character long, always
assert(getc_unlocked(fp) != EOF);
// POSIX guarantees being able to ungetc() at least one character
// NB: ungetc_unlocked is apparently not present
assert(ungetc('X', fp) != EOF);
// check whether ungetc() works with getc_unlocked()
assert(getc_unlocked(fp) == 'X');
return 0;