| David Chisnall | 06af2bb | 2012-02-29 13:17:28 +0000 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2002-2004 Tim J. Robbins. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 23 | * SUCH DAMAGE. |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | size_t |
| 28 | wcsnrtombs_l(char * __restrict dst, const wchar_t ** __restrict src, |
| 29 | size_t nwc, size_t len, mbstate_t * __restrict ps, locale_t loc) |
| 30 | { |
| 31 | FIX_LOCALE(loc); |
| 32 | mbstate_t mbsbak; |
| 33 | char buf[MB_CUR_MAX_L(loc)]; |
| 34 | const wchar_t *s; |
| 35 | size_t nbytes; |
| 36 | size_t nb; |
| 37 | |
| 38 | s = *src; |
| 39 | nbytes = 0; |
| 40 | |
| 41 | if (dst == NULL) { |
| 42 | while (nwc-- > 0) { |
| 43 | if ((nb = wcrtomb_l(buf, *s, ps, loc)) == (size_t)-1) |
| 44 | /* Invalid character - wcrtomb() sets errno. */ |
| 45 | return ((size_t)-1); |
| 46 | else if (*s == L'\0') |
| 47 | return (nbytes + nb - 1); |
| 48 | s++; |
| 49 | nbytes += nb; |
| 50 | } |
| 51 | return (nbytes); |
| 52 | } |
| 53 | |
| 54 | while (len > 0 && nwc-- > 0) { |
| 55 | if (len > (size_t)MB_CUR_MAX_L(loc)) { |
| 56 | /* Enough space to translate in-place. */ |
| 57 | if ((nb = wcrtomb_l(dst, *s, ps, loc)) == (size_t)-1) { |
| 58 | *src = s; |
| 59 | return ((size_t)-1); |
| 60 | } |
| 61 | } else { |
| 62 | /* |
| 63 | * May not be enough space; use temp. buffer. |
| 64 | * |
| 65 | * We need to save a copy of the conversion state |
| 66 | * here so we can restore it if the multibyte |
| 67 | * character is too long for the buffer. |
| 68 | */ |
| 69 | mbsbak = *ps; |
| 70 | if ((nb = wcrtomb_l(buf, *s, ps, loc)) == (size_t)-1) { |
| 71 | *src = s; |
| 72 | return ((size_t)-1); |
| 73 | } |
| 74 | if (nb > (int)len) { |
| 75 | /* MB sequence for character won't fit. */ |
| 76 | *ps = mbsbak; |
| 77 | break; |
| 78 | } |
| 79 | memcpy(dst, buf, nb); |
| 80 | } |
| 81 | if (*s == L'\0') { |
| 82 | *src = NULL; |
| 83 | return (nbytes + nb - 1); |
| 84 | } |
| 85 | s++; |
| 86 | dst += nb; |
| 87 | len -= nb; |
| 88 | nbytes += nb; |
| 89 | } |
| 90 | *src = s; |
| 91 | return (nbytes); |
| 92 | } |
| 93 | |