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/* Invoke the system diff tool to compare two strings.
Copyright (C) 2016-2021 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/run_diff.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
#include <sys/wait.h>
static char *
write_to_temp_file (const char *prefix, const char *str)
{
char *template = xasprintf ("run_diff-%s", prefix);
char *name = NULL;
int fd = create_temp_file (template, &name);
TEST_VERIFY_EXIT (fd >= 0);
free (template);
xwrite (fd, str, strlen (str));
xclose (fd);
return name;
}
void
support_run_diff (const char *left_label, const char *left,
const char *right_label, const char *right)
{
/* Ensure that the diff command output is ordered properly with
standard output. */
TEST_VERIFY_EXIT (fflush (stdout) == 0);
char *left_path = write_to_temp_file ("left-diff", left);
char *right_path = write_to_temp_file ("right-diff", right);
pid_t pid = xfork ();
if (pid == 0)
{
execlp ("diff", "diff", "-u",
"--label", left_label, "--label", right_label,
"--", left_path, right_path,
NULL);
_exit (17);
}
else
{
int status;
xwaitpid (pid, &status, 0);
if (!WIFEXITED (status) || WEXITSTATUS (status) != 1)
printf ("warning: could not run diff, exit status: %d\n"
"*** %s ***\n%s\n"
"*** %s ***\n%s\n",
status, left_label, left, right_label, right);
}
free (right_path);
free (left_path);
}
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