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Update.
2004-11-04 Jakub Jelinek <jakub@redhat.com> * libio/fileops.c (_IO_new_file_seekoff): If mode is 0 and fp->_offset == _IO_pos_BAD, just call _IO_SYSSEEK (fp, 0, dir) and if successful set fp->_offset. * libio/Makefile (tests): Add bug-ungetc3. * libio/bug-ungetc3.c: New test.
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Ulrich Drepper
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Nov 9, 2004
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Original file line number | Diff line number | Diff line change |
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/* Test program for ungetc/ftell interaction bug. */ | ||
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#include <stdio.h> | ||
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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" | ||
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static const char pattern[] = "12345"; | ||
static char *temp_file; | ||
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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); | ||
} | ||
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static int | ||
do_one_test (int mode) | ||
{ | ||
FILE *f; | ||
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f = fopen (temp_file, "r"); | ||
if (f == NULL) | ||
{ | ||
printf ("could not open temporary file: %m\n"); | ||
return 1; | ||
} | ||
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if (mode == 1 && ftell (f) != 0) | ||
{ | ||
printf ("first ftell returned wrong position %ld\n", ftell (f)); | ||
return 1; | ||
} | ||
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if (fgetc (f) != '1' || fgetc (f) != '2') | ||
{ | ||
puts ("fgetc failed"); | ||
return 1; | ||
} | ||
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if (mode == 2 && ftell (f) != 2) | ||
{ | ||
printf ("second ftell returned wrong position %ld\n", ftell (f)); | ||
return 1; | ||
} | ||
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if (ungetc ('6', f) != '6') | ||
{ | ||
puts ("ungetc failed"); | ||
return 1; | ||
} | ||
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if (ftell (f) != 1) | ||
{ | ||
printf ("third ftell returned wrong position %ld\n", ftell (f)); | ||
return 1; | ||
} | ||
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if (fgetc (f) != '6') | ||
{ | ||
puts ("fgetc failed"); | ||
return 1; | ||
} | ||
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if (ftell (f) != 2) | ||
{ | ||
printf ("fourth ftell returned wrong position %ld\n", ftell (f)); | ||
return 1; | ||
} | ||
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fclose (f); | ||
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return 0; | ||
} | ||
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static int | ||
do_test (void) | ||
{ | ||
int mode; | ||
for (mode = 0; mode <= 2; mode++) | ||
if (do_one_test (mode)) | ||
return 1; | ||
return 0; | ||
} |