diff options
Diffstat (limited to 'lib/libc/locale/wcsnrtombs.c')
-rw-r--r-- | lib/libc/locale/wcsnrtombs.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/libc/locale/wcsnrtombs.c b/lib/libc/locale/wcsnrtombs.c new file mode 100644 index 000000000000..6f2d5b0c88c0 --- /dev/null +++ b/lib/libc/locale/wcsnrtombs.c @@ -0,0 +1,111 @@ +/*- + * Copyright (c) 2002-2004 Tim J. Robbins. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <wchar.h> +#include "mblocal.h" + +size_t +wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc, + size_t len, mbstate_t * __restrict ps) +{ + static mbstate_t mbs; + + if (ps == NULL) + ps = &mbs; + return (__wcsnrtombs(dst, src, nwc, len, ps)); +} + +size_t +__wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src, + size_t nwc, size_t len, mbstate_t * __restrict ps) +{ + mbstate_t mbsbak; + char buf[MB_LEN_MAX]; + const wchar_t *s; + size_t nbytes; + size_t nb; + + s = *src; + nbytes = 0; + + if (dst == NULL) { + while (nwc-- > 0) { + if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) + /* Invalid character - wcrtomb() sets errno. */ + return ((size_t)-1); + else if (*s == L'\0') + break; + s++; + nbytes += nb; + } + return (nbytes + nb - 1); + } + + while (len > 0 && nwc-- > 0) { + if (len > (size_t)MB_CUR_MAX) { + /* Enough space to translate in-place. */ + if ((nb = (int)__wcrtomb(dst, *s, ps)) < 0) { + *src = s; + return ((size_t)-1); + } + } else { + /* + * May not be enough space; use temp. buffer. + * + * We need to save a copy of the conversion state + * here so we can restore it if the multibyte + * character is too long for the buffer. + */ + mbsbak = *ps; + if ((nb = (int)__wcrtomb(buf, *s, ps)) < 0) { + *src = s; + return ((size_t)-1); + } + if (nb > (int)len) { + /* MB sequence for character won't fit. */ + *ps = mbsbak; + break; + } + memcpy(dst, buf, nb); + } + if (*s == L'\0') { + *src = NULL; + return (nbytes + nb - 1); + } + s++; + dst += nb; + len -= nb; + nbytes += nb; + } + *src = s; + return (nbytes); +} |