I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* wchar/wcsnrtombs.c
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* Convert a wide-character string to multibyte string.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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size_t wcsnrtombs(char* restrict dst,
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const wchar_t** restrict src_ptr,
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size_t src_len,
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size_t dst_len,
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mbstate_t* restrict ps)
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{
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static mbstate_t static_ps;
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if ( !ps )
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ps = &static_ps;
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assert(src_ptr && *src_ptr);
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const wchar_t* src = *src_ptr;
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// Continue to encode multibyte characters until we have filled the
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// destination buffer or if we have exhausted the limit on input wide chars.
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size_t dst_offset = 0;
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size_t src_offset = 0;
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while ( (!dst || dst_offset < dst_len) && src_offset < src_len )
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{
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mbstate_t ps_copy = *ps;
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wchar_t wc = src[src_offset];
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char mb[MB_CUR_MAX];
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size_t amount = wcrtomb(mb, wc, ps);
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// Stop in the event a decoding error occured.
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if ( amount == (size_t) -1 )
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return *src_ptr = src + src_offset, (size_t) -1;
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// Stop decoding early in the event we encountered a partial character,
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// or that we ran out of space in the destination buffer.
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if ( amount == (size_t) -2 || (dst && dst_offset - dst_len < amount ) )
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{
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*ps = ps_copy;
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break;
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}
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// Store the decoded multibyte character in the destination buffer.
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if ( dst )
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memcpy(dst + dst_offset, mb, amount);
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// Stop decoding after decoding a null character and return a NULL
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// source pointer to the caller, not including the null character in the
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// number of characters stored in the destination buffer.
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if ( wc == L'\0' )
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{
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src = NULL;
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src_offset = 0;
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break;
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}
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dst_offset += amount;
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src_offset++;
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}
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return *src_ptr = src + src_offset, dst_offset;
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}
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