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glibc/libio/bug-ungetc3.c
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/* Test program for ungetc/ftell interaction bug. */ | |
#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[] = "12345"; | |
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)); | |
close (fd); | |
} | |
static int | |
do_one_test (int mode) | |
{ | |
FILE *f; | |
f = fopen (temp_file, "r"); | |
if (f == NULL) | |
{ | |
printf ("could not open temporary file: %m\n"); | |
return 1; | |
} | |
if (mode == 1 && ftell (f) != 0) | |
{ | |
printf ("first ftell returned wrong position %ld\n", ftell (f)); | |
return 1; | |
} | |
if (fgetc (f) != '1' || fgetc (f) != '2') | |
{ | |
puts ("fgetc failed"); | |
return 1; | |
} | |
if (mode == 2 && ftell (f) != 2) | |
{ | |
printf ("second ftell returned wrong position %ld\n", ftell (f)); | |
return 1; | |
} | |
if (ungetc ('6', f) != '6') | |
{ | |
puts ("ungetc failed"); | |
return 1; | |
} | |
if (ftell (f) != 1) | |
{ | |
printf ("third ftell returned wrong position %ld\n", ftell (f)); | |
return 1; | |
} | |
if (fgetc (f) != '6') | |
{ | |
puts ("fgetc failed"); | |
return 1; | |
} | |
if (ftell (f) != 2) | |
{ | |
printf ("fourth ftell returned wrong position %ld\n", ftell (f)); | |
return 1; | |
} | |
fclose (f); | |
return 0; | |
} | |
static int | |
do_test (void) | |
{ | |
int mode; | |
for (mode = 0; mode <= 2; mode++) | |
if (do_one_test (mode)) | |
return 1; | |
return 0; | |
} |