]>
Commit | Line | Data |
---|---|---|
5840c75c | 1 | /* Invoke the system diff tool to compare two strings. |
581c785b | 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
5840c75c FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5840c75c FW |
18 | |
19 | #include <support/run_diff.h> | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <support/check.h> | |
25 | #include <support/support.h> | |
26 | #include <support/temp_file.h> | |
ed3ea040 | 27 | #include <support/xunistd.h> |
5840c75c | 28 | #include <sys/wait.h> |
5840c75c FW |
29 | |
30 | static char * | |
31 | write_to_temp_file (const char *prefix, const char *str) | |
32 | { | |
33 | char *template = xasprintf ("run_diff-%s", prefix); | |
34 | char *name = NULL; | |
35 | int fd = create_temp_file (template, &name); | |
36 | TEST_VERIFY_EXIT (fd >= 0); | |
37 | free (template); | |
38 | xwrite (fd, str, strlen (str)); | |
ed3ea040 | 39 | xclose (fd); |
5840c75c FW |
40 | return name; |
41 | } | |
42 | ||
43 | void | |
44 | support_run_diff (const char *left_label, const char *left, | |
45 | const char *right_label, const char *right) | |
46 | { | |
47 | /* Ensure that the diff command output is ordered properly with | |
48 | standard output. */ | |
49 | TEST_VERIFY_EXIT (fflush (stdout) == 0); | |
50 | ||
51 | char *left_path = write_to_temp_file ("left-diff", left); | |
52 | char *right_path = write_to_temp_file ("right-diff", right); | |
53 | ||
54 | pid_t pid = xfork (); | |
55 | if (pid == 0) | |
56 | { | |
57 | execlp ("diff", "diff", "-u", | |
58 | "--label", left_label, "--label", right_label, | |
59 | "--", left_path, right_path, | |
60 | NULL); | |
61 | _exit (17); | |
62 | } | |
63 | else | |
64 | { | |
65 | int status; | |
66 | xwaitpid (pid, &status, 0); | |
67 | if (!WIFEXITED (status) || WEXITSTATUS (status) != 1) | |
68 | printf ("warning: could not run diff, exit status: %d\n" | |
69 | "*** %s ***\n%s\n" | |
70 | "*** %s ***\n%s\n", | |
71 | status, left_label, left, right_label, right); | |
72 | } | |
73 | ||
74 | free (right_path); | |
75 | free (left_path); | |
76 | } |