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/* Copyright (C) 1991, 1992, 1996 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., 675 Mass Ave,
Cambridge, MA 02139, 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);
{
register size_t i;
for (i = 0; i < replace_from; ++i)
{
int c = getc(f);
if (c == EOF)
{
printf("EOF at %u.\n", i);
lose = 1;
break;
}
else if (c != hello[i])
{
printf("Got '%c' instead of '%c' at %u.\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 %u.\n",
replace[i], strerror(errno), i);
lose = 1;
break;
}
}
else if (where == -1L)
{
printf("ftell got %s (should be at %u).\n",
strerror(errno), replace_from);
lose = 1;
}
else
{
printf("ftell returns %lu; should be %u.\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.");
}
exit(lose ? EXIT_FAILURE : EXIT_SUCCESS);
}
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