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glibc/stdio-common/test_rdwr.c
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/* Copyright (C) 1991,1992,1996,1997,1998,2000 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
int | |
main (int argc, char **argv) | |
{ | |
static const char hello[] = "Hello, world.\n"; | |
static const char replace[] = "Hewwo, world.\n"; | |
static const size_t replace_from = 2, replace_to = 4; | |
char filename[FILENAME_MAX]; | |
char *name = strrchr (*argv, '/'); | |
char buf[BUFSIZ]; | |
FILE *f; | |
int lose = 0; | |
if (name != NULL) | |
++name; | |
else | |
name = *argv; | |
(void) sprintf (filename, "/tmp/%s.test", name); | |
f = fopen (filename, "w+"); | |
if (f == NULL) | |
{ | |
perror (filename); | |
exit (1); | |
} | |
(void) fputs (hello, f); | |
rewind (f); | |
(void) fgets (buf, sizeof (buf), f); | |
rewind (f); | |
(void) fputs (buf, f); | |
rewind (f); | |
{ | |
size_t i; | |
for (i = 0; i < replace_from; ++i) | |
{ | |
int c = getc (f); | |
if (c == EOF) | |
{ | |
printf ("EOF at %Zu.\n", i); | |
lose = 1; | |
break; | |
} | |
else if (c != hello[i]) | |
{ | |
printf ("Got '%c' instead of '%c' at %Zu.\n", | |
(unsigned char) c, hello[i], i); | |
lose = 1; | |
break; | |
} | |
} | |
} | |
{ | |
long int where = ftell (f); | |
if (where == (long int) replace_from) | |
{ | |
register size_t i; | |
for (i = replace_from; i < replace_to; ++i) | |
if (putc(replace[i], f) == EOF) | |
{ | |
printf ("putc('%c') got %s at %Zu.\n", | |
replace[i], strerror (errno), i); | |
lose = 1; | |
break; | |
} | |
} | |
else if (where == -1L) | |
{ | |
printf ("ftell got %s (should be at %Zu).\n", | |
strerror (errno), replace_from); | |
lose = 1; | |
} | |
else | |
{ | |
printf ("ftell returns %lu; should be %Zu.\n", where, replace_from); | |
lose = 1; | |
} | |
} | |
if (!lose) | |
{ | |
rewind (f); | |
if (fgets (buf, sizeof (buf), f) == NULL) | |
{ | |
printf ("fgets got %s.\n", strerror(errno)); | |
lose = 1; | |
} | |
else if (strcmp (buf, replace)) | |
{ | |
printf ("Read \"%s\" instead of \"%s\".\n", buf, replace); | |
lose = 1; | |
} | |
} | |
if (lose) | |
printf ("Test FAILED! Losing file is \"%s\".\n", filename); | |
else | |
{ | |
(void) remove (filename); | |
puts ("Test succeeded."); | |
} | |
return lose ? EXIT_FAILURE : EXIT_SUCCESS; | |
} |