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