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libs/libc/wchar: add wcswidth implementation

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Signed-off-by: guoshichao <guoshichao@xiaomi.com>
This commit is contained in:
guoshichao 2023-09-17 14:32:01 +08:00 committed by Xiang Xiao
parent 7c0685c53d
commit d386df4424
3 changed files with 65 additions and 2 deletions
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3
libs/libc/wchar/CMakeLists.txt
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@ -63,4 +63,5 @@ target_sources(
lib_wcsstr.c
lib_wcstok.c
lib_wcswcs.c
lib_wcwidth.c)
lib_wcwidth.c
lib_wcswidth.c)

2
libs/libc/wchar/Make.defs
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@ -29,7 +29,7 @@ CSRCS += lib_swprintf.c lib_mbsnrtowcs.c lib_wcsnrtombs.c lib_mbsinit.c
CSRCS += lib_mbrlen.c lib_mbsrtowcs.c lib_wcsrtombs.c lib_wcscpy.c
CSRCS += lib_wcscat.c lib_wcslcat.c lib_wcsncat.c lib_wcsrchr.c lib_wcschr.c
CSRCS += lib_wcsncpy.c lib_wcsncmp.c lib_wcscspn.c lib_wcspbrk.c lib_wcsspn.c
CSRCS += lib_wcsstr.c lib_wcstok.c lib_wcswcs.c lib_wcwidth.c
CSRCS += lib_wcsstr.c lib_wcstok.c lib_wcswcs.c lib_wcwidth.c lib_wcswidth.c
# Add the wchar directory to the build

62
libs/libc/wchar/lib_wcswidth.c Normal file
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@ -0,0 +1,62 @@
/****************************************************************************
* libs/libc/wchar/lib_wcswidth.c
*
* Copyright © 2005-2014 Rich Felker, et al.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <wchar.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wcswidth
*
* Description:
* Determine columns needed for a fixed-size wide charcater string
*
* Input Parameters:
* wcs - the wide character string need to calculate
* n - the length the wide character string
*
* Returned Value:
* Return the number of columns needed to represent the wide-character
* string pointed by "wcs", but at most "n" wide character. If a
* nonprintable wide character occurs among these characters, -1 is
* returned
*
****************************************************************************/
int wcswidth(FAR const wchar_t *wcs, size_t n)
{
int l = 0;
int k = 0;
for (; n-- && *wcs && (k = wcwidth(*wcs)) >= 0; l += k, wcs++);
return k < 0 ? k : l;
}