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/* test-distrib.c --- testing distribution of nonprinting chars
Copyright (C) 1987, 1993-1995, 1999, 2001-2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
/* Break string in two parts to avoid buggy C compilers that ignore characters
after nulls in strings. */
static char string1[] = "Testing distribution of nonprinting chars:\n\
Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
Should be 0000: ";
static char string2[] = ".\n\
This file is read by the `test-distribution' program.\n\
If you change it, you will make that program fail.\n";
/* Like `read' but keeps trying until it gets SIZE bytes or reaches eof. */
static int
cool_read (int fd, char *buf, size_t size)
{
ssize_t num;
ssize_t sofar = 0;
while (1)
{
if ((num = read (fd, buf + sofar, size - sofar)) == 0)
return sofar;
else if (num < 0)
return num;
sofar += num;
}
}
int
main (int argc, char **argv)
{
int fd;
char buf[300];
if (argc != 2)
{
fprintf (stderr, "Usage: %s testfile\n", argv[0]);
exit (EXIT_FAILURE);
}
fd = open (argv[1], O_RDONLY);
if (fd < 0)
{
perror (argv[1]);
exit (EXIT_FAILURE);
}
if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
strcmp (buf, string1) ||
cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
strncmp (buf, string2, sizeof string2 - 1))
{
fprintf (stderr, "Data in file `%s' has been damaged.\n\
Most likely this means that many nonprinting characters\n\
have been corrupted in the files of Emacs, and it will not work.\n",
argv[1]);
exit (EXIT_FAILURE);
}
close (fd);
return EXIT_SUCCESS;
}
/* test-distrib.c ends here */
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