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77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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wcsrtombs.cpp
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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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extern "C" size_t wcsrtombs(char* dst, const wchar_t** src_ptr, size_t dst_len,
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mbstate_t* ps)
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{
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assert(src_ptr && *src_ptr);
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// Avoid changing *src_ptr if dst is NULL.
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const wchar_t* local_src_ptr = *src_ptr;
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if ( !dst )
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src_ptr = &local_src_ptr;
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// For some reason, the standards don't mandate that the secret ps variable
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// is reset when ps is NULL, unlike mbstowcs that always resets this
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// variable. We'll avoid resetting the variable here in case any programs
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// actually take advantage of this fact.
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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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size_t ret = 0;
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size_t src_len = wcslen(*src_ptr);
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char buf[MB_CUR_MAX];
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while ( !dst || dst_len )
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{
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mbstate_t saved_ps = *ps;
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size_t produced = wcrtomb(buf, **src_ptr, ps);
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if ( produced == (size_t) -1 )
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return (size_t) -1;
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if ( dst && dst_len < produced )
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{
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*ps = saved_ps;
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break;
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}
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memcpy(dst, buf, produced);
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if ( **src_ptr == L'\0' )
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{
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ret += produced - 1; // Don't count the '\0' byte.
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*src_ptr = NULL;
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break;
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}
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ret += produced;
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(*src_ptr)++;
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src_len--;
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if ( dst )
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dst += produced,
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dst_len -= produced;
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ret++;
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}
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return ret;
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}
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