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f4e23950c7
The issues found fell into these categories, with the applied fixes:
- const was accidentally stripped.
Adjust code to not cast or cast with const.
- const/volatile missing from arguments, local variables.
Constify arguments or variables, adjust/delete casts. Small code
changes in a few places.
- const must be stripped because an API dependency requires it.
Strip `const` with `CURL_UNCONST()` macro to silence the warning out
of our control. These happen at API boundaries. Sometimes they depend
on dependency version, which this patch handles as necessary. Also
enable const support for the zlib API, using `ZLIB_CONST`. Supported
by zlib 1.2.5.2 and newer.
- const must be stripped because a curl API requires it.
Strip `const` with `CURL_UNCONST()` macro to silence the warning out
of our immediate control. For example we promise to send a non-const
argument to a callback, though the data is const internally.
- other cases where we may avoid const stripping by code changes.
Also silenced with `CURL_UNCONST()`.
- there are 3 places where `CURL_UNCONST()` is cast again to const.
To silence this type of warning:
```
lib/vquic/curl_osslq.c:1015:29: error: to be safe all intermediate
pointers in cast from 'unsigned char **' to 'const unsigned char **'
must be 'const' qualified [-Werror=cast-qual]
lib/cf-socket.c:734:32: error: to be safe all intermediate pointers in
cast from 'char **' to 'const char **' must be 'const' qualified
[-Werror=cast-qual]
```
There may be a better solution, but I couldn't find it.
These cases are handled in separate subcommits, but without further
markup.
If you see a `-Wcast-qual` warning in curl, we appreciate your report
about it.
Closes #16142
92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
#ifndef HEADER_CURL_MULTIBYTE_H
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#define HEADER_CURL_MULTIBYTE_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifdef _WIN32
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/*
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* MultiByte conversions using Windows kernel32 library.
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*/
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wchar_t *curlx_convert_UTF8_to_wchar(const char *str_utf8);
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char *curlx_convert_wchar_to_UTF8(const wchar_t *str_w);
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#endif /* _WIN32 */
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/*
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* Macros curlx_convert_UTF8_to_tchar(), curlx_convert_tchar_to_UTF8()
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* and curlx_unicodefree() main purpose is to minimize the number of
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* preprocessor conditional directives needed by code using these
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* to differentiate Unicode from non-Unicode builds.
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*
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* In the case of a non-Unicode build the tchar strings are char strings that
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* are duplicated via strdup and remain in whatever the passed in encoding is,
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* which is assumed to be UTF-8 but may be other encoding. Therefore the
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* significance of the conversion functions is primarily for Unicode builds.
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*
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* Allocated memory should be free'd with curlx_unicodefree().
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*
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* Note: Because these are curlx functions their memory usage is not tracked
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* by the curl memory tracker memdebug. you will notice that curlx
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* function-like macros call free and strdup in parentheses, eg (strdup)(ptr),
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* and that is to ensure that the curl memdebug override macros do not replace
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* them.
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*/
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#if defined(UNICODE) && defined(_WIN32)
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#define curlx_convert_UTF8_to_tchar(ptr) curlx_convert_UTF8_to_wchar((ptr))
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#define curlx_convert_tchar_to_UTF8(ptr) curlx_convert_wchar_to_UTF8((ptr))
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typedef union {
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unsigned short *tchar_ptr;
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const unsigned short *const_tchar_ptr;
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unsigned short *tbyte_ptr;
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const unsigned short *const_tbyte_ptr;
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} xcharp_u;
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#else
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#define curlx_convert_UTF8_to_tchar(ptr) (strdup)(ptr)
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#define curlx_convert_tchar_to_UTF8(ptr) (strdup)(ptr)
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typedef union {
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char *tchar_ptr;
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const char *const_tchar_ptr;
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unsigned char *tbyte_ptr;
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const unsigned char *const_tbyte_ptr;
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} xcharp_u;
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#endif /* UNICODE && _WIN32 */
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#define curlx_unicodefree(ptr) \
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do { \
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if(ptr) { \
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(free)(CURL_UNCONST(ptr)); \
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(ptr) = NULL; \
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} \
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} while(0)
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#endif /* HEADER_CURL_MULTIBYTE_H */
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