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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