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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 Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <errno.h>
21 #include <gconv.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <wchar.h>
25 #include <wcsmbsload.h>
27 #include <assert.h>
29 #ifndef EILSEQ
30 # define EILSEQ EINVAL
31 #endif
34 /* This is the private state used if PS is NULL. */
35 static mbstate_t state;
37 size_t
38 __mbsrtowcs (dst, src, len, ps)
39 wchar_t *dst;
40 const char **src;
41 size_t len;
42 mbstate_t *ps;
44 struct __gconv_step_data data;
45 size_t result;
46 int status;
47 struct __gconv_step *towc;
48 size_t non_reversible;
50 /* Tell where we want the result. */
51 data.__invocation_counter = 0;
52 data.__internal_use = 1;
53 data.__is_last = 1;
54 data.__statep = ps ?: &state;
56 /* Make sure we use the correct function. */
57 update_conversion_ptrs ();
59 /* Get the structure with the function pointers. */
60 towc = __wcsmbs_gconv_fcts.towc;
62 /* We have to handle DST == NULL special. */
63 if (dst == NULL)
65 mbstate_t temp_state;
66 wchar_t buf[64]; /* Just an arbitrary size. */
67 const unsigned char *inbuf = (const unsigned char *) *src;
68 const unsigned char *srcend = inbuf + strlen (inbuf) + 1;
70 temp_state = *data.__statep;
71 data.__statep = &temp_state;
73 result = 0;
74 data.__outbufend = (char *) buf + sizeof (buf);
77 data.__outbuf = (char *) buf;
79 status = (*towc->__fct) (__wcsmbs_gconv_fcts.towc, &data, &inbuf,
80 srcend, &non_reversible, 0, 1);
82 result += (wchar_t *) data.__outbuf - buf;
84 while (status == __GCONV_FULL_OUTPUT);
86 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
88 /* There better should be a NUL wide char at the end. */
89 assert (((wchar_t *) data.__outbuf)[-1] == L'\0');
90 /* Don't count the NUL character in. */
91 --result;
94 else
96 /* This code is based on the safe assumption that all internal
97 multi-byte encodings use the NUL byte only to mark the end
98 of the string. */
99 const unsigned char *srcend;
101 srcend = (const unsigned char *) (*src
102 + __strnlen (*src, len * MB_CUR_MAX)
103 + 1);
105 data.__outbuf = (unsigned char *) dst;
106 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
108 status = (*towc->__fct) (__wcsmbs_gconv_fcts.towc, &data,
109 (const unsigned char **) src, srcend,
110 &non_reversible, 0, 1);
112 result = (wchar_t *) data.__outbuf - dst;
114 /* We have to determine whether the last character converted
115 is the NUL character. */
116 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
117 && ((wchar_t *) dst)[result - 1] == L'\0')
119 assert (result > 0);
120 assert (__mbsinit (data.__statep));
121 *src = NULL;
122 --result;
126 /* There must not be any problems with the conversion but illegal input
127 characters. */
128 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
129 || status == __GCONV_ILLEGAL_INPUT
130 || status == __GCONV_INCOMPLETE_INPUT
131 || status == __GCONV_FULL_OUTPUT);
133 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
134 && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
136 result = (size_t) -1;
137 __set_errno (EILSEQ);
140 return result;
142 weak_alias (__mbsrtowcs, mbsrtowcs)