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77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Invoke the system diff tool to compare two strings.
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Copyright (C) 2016-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/run_diff.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xunistd.h>
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#include <sys/wait.h>
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static char *
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write_to_temp_file (const char *prefix, const char *str)
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{
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char *template = xasprintf ("run_diff-%s", prefix);
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char *name = NULL;
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int fd = create_temp_file (template, &name);
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TEST_VERIFY_EXIT (fd >= 0);
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free (template);
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xwrite (fd, str, strlen (str));
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xclose (fd);
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return name;
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}
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void
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support_run_diff (const char *left_label, const char *left,
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const char *right_label, const char *right)
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{
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/* Ensure that the diff command output is ordered properly with
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standard output. */
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TEST_VERIFY_EXIT (fflush (stdout) == 0);
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char *left_path = write_to_temp_file ("left-diff", left);
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char *right_path = write_to_temp_file ("right-diff", right);
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pid_t pid = xfork ();
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if (pid == 0)
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{
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execlp ("diff", "diff", "-u",
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"--label", left_label, "--label", right_label,
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"--", left_path, right_path,
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NULL);
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_exit (17);
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}
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else
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{
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int status;
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xwaitpid (pid, &status, 0);
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if (!WIFEXITED (status) || WEXITSTATUS (status) != 1)
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printf ("warning: could not run diff, exit status: %d\n"
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"*** %s ***\n%s\n"
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"*** %s ***\n%s\n",
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status, left_label, left, right_label, right);
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}
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free (right_path);
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free (left_path);
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}
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