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[glibc.git] / wcsmbs / wcsrtombs.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 <stdlib.h>
23 #include <gconv.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 __wcsrtombs (dst, src, len, ps)
39 char *dst;
40 const wchar_t **src;
41 size_t len;
42 mbstate_t *ps;
44 struct __gconv_step_data data;
45 int status;
46 size_t result;
47 struct __gconv_step *tomb;
49 /* Tell where we want the result. */
50 data.__invocation_counter = 0;
51 data.__internal_use = 1;
52 data.__flags = __GCONV_IS_LAST;
53 data.__statep = ps ?: &state;
54 data.__trans = NULL;
56 /* Make sure we use the correct function. */
57 update_conversion_ptrs ();
59 /* Get the structure with the function pointers. */
60 tomb = __wcsmbs_gconv_fcts.tomb;
62 /* We have to handle DST == NULL special. */
63 if (dst == NULL)
65 mbstate_t temp_state;
66 unsigned char buf[256]; /* Just an arbitrary value. */
67 const wchar_t *srcend = *src + __wcslen (*src) + 1;
68 const wchar_t *inbuf = *src;
69 size_t dummy;
71 temp_state = *data.__statep;
72 data.__statep = &temp_state;
74 result = 0;
75 data.__outbufend = buf + sizeof (buf);
79 data.__outbuf = buf;
81 status = DL_CALL_FCT (tomb->__fct,
82 (tomb, &data, (const unsigned char **) &inbuf,
83 (const unsigned char *) srcend, NULL,
84 &dummy, 0, 1));
86 /* Count the number of bytes. */
87 result += data.__outbuf - buf;
89 while (status == __GCONV_FULL_OUTPUT);
91 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
93 /* There better should be a NUL byte at the end. */
94 assert (data.__outbuf[-1] == '\0');
95 /* Don't count the NUL character in. */
96 --result;
99 else
101 /* This code is based on the safe assumption that all internal
102 multi-byte encodings use the NUL byte only to mark the end
103 of the string. */
104 const wchar_t *srcend = *src + __wcsnlen (*src, len) + 1;
105 size_t dummy;
107 data.__outbuf = dst;
108 data.__outbufend = dst + len;
110 status = DL_CALL_FCT (tomb->__fct,
111 (tomb, &data, (const unsigned char **) src,
112 (const unsigned char *) srcend, NULL,
113 &dummy, 0, 1));
115 /* Count the number of bytes. */
116 result = data.__outbuf - (unsigned char *) dst;
118 /* We have to determine whether the last character converted
119 is the NUL character. */
120 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
121 && data.__outbuf[-1] == '\0')
123 assert (data.__outbuf != (unsigned char *) dst);
124 assert (__mbsinit (data.__statep));
125 *src = NULL;
126 --result;
130 /* There must not be any problems with the conversion but illegal input
131 characters. */
132 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
133 || status == __GCONV_ILLEGAL_INPUT
134 || status == __GCONV_INCOMPLETE_INPUT
135 || status == __GCONV_FULL_OUTPUT);
137 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
138 && status != __GCONV_EMPTY_INPUT)
140 result = (size_t) -1;
141 __set_errno (EILSEQ);
144 return result;
146 weak_alias (__wcsrtombs, wcsrtombs)