diff options
Diffstat (limited to 'tests/test-fseeko.c')
| -rw-r--r-- | tests/test-fseeko.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/tests/test-fseeko.c b/tests/test-fseeko.c index 3be4f6e502..25289cef06 100644 --- a/tests/test-fseeko.c +++ b/tests/test-fseeko.c @@ -26,7 +26,7 @@ int main (int argc, char **argv) { - /* Assume stdin is seekable iff argc > 1. */ + /* Assume stdin is non-empty and seekable iff argc > 1. */ int expected = argc > 1 ? 0 : -1; /* Exit with success only if fseek/fseeko agree. */ int r1 = fseeko (stdin, (off_t)0, SEEK_CUR); @@ -35,11 +35,17 @@ main (int argc, char **argv) return 1; if (argc > 1) { - /* Test that fseek resets end-of-file marker. */ + /* Test that fseek discards ungetc data. */ + int ch = fgetc (stdin); + if (ch == EOF) + return 1; + if (ungetc (ch ^ 0xff, stdin) != (ch ^ 0xff)) + return 1; if (fseeko (stdin, (off_t) 0, SEEK_END)) return 1; if (fgetc (stdin) != EOF) return 1; + /* Test that fseek resets end-of-file marker. */ if (!feof (stdin)) return 1; if (fseeko (stdin, (off_t) 0, SEEK_END)) |