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1 | /*- |
2 | * Copyright (c) 2002-2004 Tim J. Robbins. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
24 | * SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include <sys/cdefs.h> | |
28 | __FBSDID("$FreeBSD: src/lib/libc/locale/wcsnrtombs.c,v 1.2 2004/07/22 02:57:29 tjr Exp $"); | |
29 | ||
30 | #include <limits.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <wchar.h> | |
34 | #include "mblocal.h" | |
35 | ||
36 | size_t | |
37 | wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc, | |
38 | size_t len, mbstate_t * __restrict ps) | |
39 | { | |
40 | static mbstate_t mbs; | |
41 | ||
42 | if (ps == NULL) | |
43 | ps = &mbs; | |
44 | return (__wcsnrtombs(dst, src, nwc, len, ps)); | |
45 | } | |
46 | ||
47 | size_t | |
48 | __wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src, | |
49 | size_t nwc, size_t len, mbstate_t * __restrict ps) | |
50 | { | |
51 | mbstate_t mbsbak; | |
52 | char buf[MB_LEN_MAX]; | |
53 | const wchar_t *s; | |
54 | size_t nbytes; | |
55 | size_t nb; | |
56 | ||
57 | s = *src; | |
58 | nbytes = 0; | |
59 | ||
60 | if (dst == NULL) { | |
61 | while (nwc-- > 0) { | |
62 | if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) | |
63 | /* Invalid character - wcrtomb() sets errno. */ | |
64 | return ((size_t)-1); | |
65 | else if (*s == L'\0') | |
66 | return (nbytes + nb - 1); | |
67 | s++; | |
68 | nbytes += nb; | |
69 | } | |
70 | return (nbytes); | |
71 | } | |
72 | ||
73 | while (len > 0 && nwc-- > 0) { | |
74 | if (len > (size_t)MB_CUR_MAX) { | |
75 | /* Enough space to translate in-place. */ | |
76 | if ((nb = (int)__wcrtomb(dst, *s, ps)) < 0) { | |
77 | *src = s; | |
78 | return ((size_t)-1); | |
79 | } | |
80 | } else { | |
81 | /* | |
82 | * May not be enough space; use temp. buffer. | |
83 | * | |
84 | * We need to save a copy of the conversion state | |
85 | * here so we can restore it if the multibyte | |
86 | * character is too long for the buffer. | |
87 | */ | |
88 | mbsbak = *ps; | |
89 | if ((nb = (int)__wcrtomb(buf, *s, ps)) < 0) { | |
90 | *src = s; | |
91 | return ((size_t)-1); | |
92 | } | |
93 | if (nb > (int)len) { | |
94 | /* MB sequence for character won't fit. */ | |
95 | *ps = mbsbak; | |
96 | break; | |
97 | } | |
98 | memcpy(dst, buf, nb); | |
99 | } | |
100 | if (*s == L'\0') { | |
101 | *src = NULL; | |
102 | return (nbytes + nb - 1); | |
103 | } | |
104 | s++; | |
105 | dst += nb; | |
106 | len -= nb; | |
107 | nbytes += nb; | |
108 | } | |
109 | *src = s; | |
110 | return (nbytes); | |
111 | } |