curl/src/tool_stderr.c
Viktor Szakats 20142f5d06
build: avoid overriding system symbols for fopen functions
By introducing wrappers for them in the curlx namespace:
`curlx_fopen()`, `curlx_fdopen()`, `curlx_fclose()`.

The undefine/redefine/`(function)()` methods broke on systems
implementing these functions as macros. E.g. AIX 32-bit's `fopen()`.

Also:
- rename `lib/fopen.*` to `lib/curl_fopen.*` (for `Curl_fopen()`)
  to make room for the newly added `curlx/fopen.h`.
- curlx: move file-related functions from `multibyte.c` to `fopen.c`.
- tests/server: stop using the curl-specific `fopen()` implementation
  on Windows. Unicode isn't used by runtests, and it isn't critical to
  run tests on longs path. It can be re-enabled if this becomes
  necessary, or if the wrapper receives a feature that's critical for
  test servers.

Reported-by: Andrew Kirillov
Bug: https://github.com/curl/curl/issues/18510#issuecomment-3274393640

Follow-up to bf7375ecc5 #18503
Follow-up to 9863599d69 #18502
Follow-up to 3bb5e58c10 #17827

Closes #18634
2025-09-30 01:10:36 +02:00

71 lines
2.1 KiB
C

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "tool_setup.h"
#include "tool_stderr.h"
#include "tool_msgs.h"
#include "memdebug.h" /* keep this as LAST include */
FILE *tool_stderr;
void tool_init_stderr(void)
{
/* !checksrc! disable STDERR 1 */
tool_stderr = stderr;
}
void tool_set_stderr_file(const char *filename)
{
FILE *fp;
if(!filename)
return;
if(!strcmp(filename, "-")) {
tool_stderr = stdout;
return;
}
/* precheck that filename is accessible to lessen the chance that the
subsequent freopen will fail. */
fp = curlx_fopen(filename, FOPEN_WRITETEXT);
if(!fp) {
warnf("Warning: Failed to open %s", filename);
return;
}
curlx_fclose(fp);
/* freopen the actual stderr (stdio.h stderr) instead of tool_stderr since
the latter may be set to stdout. */
/* !checksrc! disable STDERR 1 */
fp = freopen(filename, FOPEN_WRITETEXT, stderr);
if(!fp) {
/* stderr may have been closed by freopen. there is nothing to be done. */
DEBUGASSERT(0);
return;
}
/* !checksrc! disable STDERR 1 */
tool_stderr = stderr;
}