xref: /third_party/curl/src/tool_stderr.c (revision 13498266) 
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#include "tool_setup.h"
26#include "tool_stderr.h"
27#include "tool_msgs.h"
28
29#include "memdebug.h" /* keep this as LAST include */
30
31FILE *tool_stderr;
32
33void tool_init_stderr(void)
34{
35  /* !checksrc! disable STDERR 1 */
36  tool_stderr = stderr;
37}
38
39void tool_set_stderr_file(struct GlobalConfig *global, char *filename)
40{
41  FILE *fp;
42
43  if(!filename)
44    return;
45
46  if(!strcmp(filename, "-")) {
47    tool_stderr = stdout;
48    return;
49  }
50
51  /* precheck that filename is accessible to lessen the chance that the
52     subsequent freopen will fail. */
53  fp = fopen(filename, FOPEN_WRITETEXT);
54  if(!fp) {
55    warnf(global, "Warning: Failed to open %s", filename);
56    return;
57  }
58  fclose(fp);
59
60  /* freopen the actual stderr (stdio.h stderr) instead of tool_stderr since
61     the latter may be set to stdout. */
62  /* !checksrc! disable STDERR 1 */
63  fp = freopen(filename, FOPEN_WRITETEXT, stderr);
64  if(!fp) {
65    /* stderr may have been closed by freopen. there is nothing to be done. */
66    DEBUGASSERT(0);
67    return;
68  }
69  /* !checksrc! disable STDERR 1 */
70  tool_stderr = stderr;
71}
72