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glibc/libio/bug-ungetc4.c
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/* Test program for ungetc/fseekpos interaction. | |
Copyright (C) 2004-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Jakub Jelinek <jakub@redhat.com>, 2004. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
static void do_prepare (void); | |
#define PREPARE(argc, argv) do_prepare () | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
static const char pattern[] = "abcdefghijklmnopqrstuvwxyz"; | |
static char *temp_file; | |
static void | |
do_prepare (void) | |
{ | |
int fd = create_temp_file ("bug-ungetc.", &temp_file); | |
if (fd == -1) | |
{ | |
printf ("cannot create temporary file: %m\n"); | |
exit (1); | |
} | |
write (fd, pattern, sizeof (pattern) - 1); | |
close (fd); | |
} | |
#define TEST_POS 5 | |
static int | |
do_one_test (int mode) | |
{ | |
FILE *f = fopen (temp_file, "r"); | |
if (f == NULL) | |
{ | |
printf ("%d: could not open temporary file: %m\n", mode); | |
return 1; | |
} | |
int i; | |
for (i = 0; i < TEST_POS; ++i) | |
getc (f); | |
fpos_t p; | |
if (fgetpos (f, &p) != 0) | |
{ | |
printf ("%d: fgetpos failed: %m\n", mode); | |
return 1; | |
} | |
if (mode) | |
{ | |
if (fseek (f, 0, SEEK_SET) != 0) | |
{ | |
printf ("%d: fseek failed: %m\n", mode); | |
return 1; | |
} | |
for (i = 0; i < TEST_POS - (mode >= 2); ++i) | |
getc (f); | |
} | |
if (mode != 2 && ungetc ('X', f) != 'X') | |
{ | |
printf ("%d: ungetc failed\n", mode); | |
return 1; | |
} | |
if (mode == 3 && getc (f) != 'X') | |
{ | |
printf ("%d: getc after ungetc did not return X\n", mode); | |
return 1; | |
} | |
if (fsetpos (f, &p) != 0) | |
{ | |
printf ("%d: fsetpos failed: %m\n", mode); | |
return 1; | |
} | |
if (getc (f) != pattern[TEST_POS]) | |
{ | |
printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]); | |
return 1; | |
} | |
fclose (f); | |
return 0; | |
} | |
static int | |
do_test (void) | |
{ | |
int mode, ret = 0; | |
for (mode = 0; mode <= 4; mode++) | |
ret |= do_one_test (mode); | |
return ret; | |
} |