1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 /* In this file, stdio.h's stderr macro is not overridden. */
26 #define CURL_DO_NOT_OVERRIDE_STDERR
27
28 #include "tool_setup.h"
29
30 #include "tool_stderr.h"
31
32 #include "memdebug.h" /* keep this as LAST include */
33
34 /* In other tool files stderr is defined as tool_stderr by tool_setup.h */
35 FILE *tool_stderr;
36
tool_init_stderr(void)37 void tool_init_stderr(void)
38 {
39 tool_stderr = stderr;
40 }
41
tool_set_stderr_file(char * filename)42 void tool_set_stderr_file(char *filename)
43 {
44 FILE *fp;
45
46 if(!filename)
47 return;
48
49 if(!strcmp(filename, "-")) {
50 tool_stderr = stdout;
51 return;
52 }
53
54 /* precheck that filename is accessible to lessen the chance that the
55 subsequent freopen will fail. */
56 fp = fopen(filename, FOPEN_WRITETEXT);
57 if(!fp) {
58 fprintf(tool_stderr, "Warning: Failed to open %s!\n", filename);
59 return;
60 }
61 fclose(fp);
62
63 /* freopen the actual stderr (stdio.h stderr) instead of tool_stderr since
64 the latter may be set to stdout. */
65 fp = freopen(filename, FOPEN_WRITETEXT, stderr);
66 if(!fp) {
67 /* stderr may have been closed by freopen. there is nothing to be done. */
68 DEBUGASSERT(0);
69 return;
70 }
71 tool_stderr = stderr;
72 }
73