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[glibc.git] / wcsmbs / mbsrtowcs.c
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1 /* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
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 <dlfcn.h>
21 #include <errno.h>
22 #include <gconv.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <wchar.h>
26 #include <wcsmbsload.h>
28 #include <assert.h>
30 #ifndef EILSEQ
31 # define EILSEQ EINVAL
32 #endif
35 /* This is the private state used if PS is NULL. */
36 static mbstate_t state;
38 size_t
39 __mbsrtowcs (dst, src, len, ps)
40 wchar_t *dst;
41 const char **src;
42 size_t len;
43 mbstate_t *ps;
45 struct __gconv_step_data data;
46 size_t result;
47 int status;
48 struct __gconv_step *towc;
49 size_t non_reversible;
51 /* Tell where we want the result. */
52 data.__invocation_counter = 0;
53 data.__internal_use = 1;
54 data.__flags = __GCONV_IS_LAST;
55 data.__statep = ps ?: &state;
56 data.__trans = NULL;
58 /* Make sure we use the correct function. */
59 update_conversion_ptrs ();
61 /* Get the structure with the function pointers. */
62 towc = __wcsmbs_gconv_fcts.towc;
64 /* We have to handle DST == NULL special. */
65 if (dst == NULL)
67 mbstate_t temp_state;
68 wchar_t buf[64]; /* Just an arbitrary size. */
69 const unsigned char *inbuf = (const unsigned char *) *src;
70 const unsigned char *srcend = inbuf + strlen (inbuf) + 1;
72 temp_state = *data.__statep;
73 data.__statep = &temp_state;
75 result = 0;
76 data.__outbufend = (char *) buf + sizeof (buf);
79 data.__outbuf = (char *) buf;
81 status = DL_CALL_FCT (towc->__fct,
82 (towc, &data, &inbuf, srcend, NULL,
83 &non_reversible, 0, 1));
85 result += (wchar_t *) data.__outbuf - buf;
87 while (status == __GCONV_FULL_OUTPUT);
89 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
91 /* There better should be a NUL wide char at the end. */
92 assert (((wchar_t *) data.__outbuf)[-1] == L'\0');
93 /* Don't count the NUL character in. */
94 --result;
97 else
99 /* This code is based on the safe assumption that all internal
100 multi-byte encodings use the NUL byte only to mark the end
101 of the string. */
102 const unsigned char *srcend;
104 srcend = (const unsigned char *) (*src
105 + __strnlen (*src, len * MB_CUR_MAX)
106 + 1);
108 data.__outbuf = (unsigned char *) dst;
109 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
111 status = DL_CALL_FCT (towc->__fct,
112 (towc, &data, (const unsigned char **) src, srcend,
113 NULL, &non_reversible, 0, 1));
115 result = (wchar_t *) data.__outbuf - dst;
117 /* We have to determine whether the last character converted
118 is the NUL character. */
119 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
120 && ((wchar_t *) dst)[result - 1] == L'\0')
122 assert (result > 0);
123 assert (__mbsinit (data.__statep));
124 *src = NULL;
125 --result;
129 /* There must not be any problems with the conversion but illegal input
130 characters. */
131 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
132 || status == __GCONV_ILLEGAL_INPUT
133 || status == __GCONV_INCOMPLETE_INPUT
134 || status == __GCONV_FULL_OUTPUT);
136 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
137 && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
139 result = (size_t) -1;
140 __set_errno (EILSEQ);
143 return result;
145 weak_alias (__mbsrtowcs, mbsrtowcs)