Update.
[glibc.git] / wcsmbs / mbsrtowcs_l.c
blob8da3095566f775cb216a69232660e16db7243fc1
1 /* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.org>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <ctype.h>
21 #include <string.h>
22 #include "wcsmbsload.h"
23 #include <dlfcn.h>
24 #include <errno.h>
25 #include <gconv.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <wchar.h>
29 #include <wcsmbsload.h>
31 #include <assert.h>
33 #ifndef EILSEQ
34 # define EILSEQ EINVAL
35 #endif
38 size_t
39 attribute_hidden
40 __mbsrtowcs_l (dst, src, len, ps, l)
41 wchar_t *dst;
42 const char **src;
43 size_t len;
44 mbstate_t *ps;
45 __locale_t l;
47 struct __gconv_step_data data;
48 size_t result;
49 int status;
50 struct __gconv_step *towc;
51 size_t non_reversible;
52 const struct gconv_fcts *fcts;
54 /* Tell where we want the result. */
55 data.__invocation_counter = 0;
56 data.__internal_use = 1;
57 data.__flags = __GCONV_IS_LAST;
58 data.__statep = ps;
59 data.__trans = NULL;
61 /* Get the conversion functions. */
62 fcts = get_gconv_fcts (l->__locales[LC_CTYPE]);
64 /* Get the structure with the function pointers. */
65 towc = fcts->towc;
67 /* We have to handle DST == NULL special. */
68 if (dst == NULL)
70 mbstate_t temp_state;
71 wchar_t buf[64]; /* Just an arbitrary size. */
72 const unsigned char *inbuf = (const unsigned char *) *src;
73 const unsigned char *srcend = inbuf + strlen (inbuf) + 1;
75 temp_state = *data.__statep;
76 data.__statep = &temp_state;
78 result = 0;
79 data.__outbufend = (char *) buf + sizeof (buf);
82 data.__outbuf = (char *) buf;
84 status = DL_CALL_FCT (towc->__fct,
85 (towc, &data, &inbuf, srcend, NULL,
86 &non_reversible, 0, 1));
88 result += (wchar_t *) data.__outbuf - buf;
90 while (status == __GCONV_FULL_OUTPUT);
92 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
94 /* There better should be a NUL wide char at the end. */
95 assert (((wchar_t *) data.__outbuf)[-1] == L'\0');
96 /* Don't count the NUL character in. */
97 --result;
100 else
102 /* This code is based on the safe assumption that all internal
103 multi-byte encodings use the NUL byte only to mark the end
104 of the string. */
105 const unsigned char *srcp = (const unsigned char *) *src;
106 const unsigned char *srcend;
108 data.__outbuf = (unsigned char *) dst;
109 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
111 status = __GCONV_FULL_OUTPUT;
113 while (len > 0)
115 /* Pessimistic guess as to how much input we can use. In the
116 worst case we need one input byte for one output wchar_t. */
117 srcend = srcp + __strnlen (srcp, len) + 1;
119 status = DL_CALL_FCT (towc->__fct,
120 (towc, &data, &srcp, srcend, NULL,
121 &non_reversible, 0, 1));
122 if ((status != __GCONV_EMPTY_INPUT
123 && status != __GCONV_INCOMPLETE_INPUT)
124 /* Not all input read. */
125 || srcp != srcend
126 /* Reached the end of the input. */
127 || srcend[-1] == '\0')
128 break;
130 len = (wchar_t *) data.__outbufend - (wchar_t *) data.__outbuf;
133 /* Make the end if the input known to the caller. */
134 *src = srcp;
136 result = (wchar_t *) data.__outbuf - dst;
138 /* We have to determine whether the last character converted
139 is the NUL character. */
140 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
141 && ((wchar_t *) dst)[result - 1] == L'\0')
143 assert (result > 0);
144 assert (__mbsinit (data.__statep));
145 *src = NULL;
146 --result;
150 /* There must not be any problems with the conversion but illegal input
151 characters. */
152 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
153 || status == __GCONV_ILLEGAL_INPUT
154 || status == __GCONV_INCOMPLETE_INPUT
155 || status == __GCONV_FULL_OUTPUT);
157 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
158 && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
160 result = (size_t) -1;
161 __set_errno (EILSEQ);
164 return result;