| /* Invoke the system diff tool to compare two strings. |
| Copyright (C) 2016-2018 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 |
| <http://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); |
| } |