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[glibc.git] / wcsmbs / wcsnrtombs.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 <wchar.h>
24 #include <wcsmbsload.h>
26 #include <assert.h>
28 #ifndef EILSEQ
29 # define EILSEQ EINVAL
30 #endif
33 /* This is the private state used if PS is NULL. */
34 static mbstate_t state;
36 /* This is a non-standard function but it is very useful in the
37 implementation of stdio because we have to deal with unterminated
38 buffers. At most NWC wide character will be converted. */
39 size_t
40 __wcsnrtombs (dst, src, nwc, len, ps)
41 char *dst;
42 const wchar_t **src;
43 size_t nwc;
44 size_t len;
45 mbstate_t *ps;
47 struct __gconv_step_data data;
48 const wchar_t *srcend;
49 int status;
50 size_t result;
51 struct __gconv_step *tomb;
53 /* Tell where we want the result. */
54 data.__invocation_counter = 0;
55 data.__internal_use = 1;
56 data.__flags = __GCONV_IS_LAST;
57 data.__statep = ps ?: &state;
58 data.__trans = NULL;
60 if (nwc == 0)
61 return 0;
62 srcend = *src + __wcsnlen (*src, nwc - 1) + 1;
64 /* Make sure we use the correct function. */
65 update_conversion_ptrs ();
67 /* Get the structure with the function pointers. */
68 tomb = __wcsmbs_gconv_fcts.tomb;
70 /* We have to handle DST == NULL special. */
71 if (dst == NULL)
73 unsigned char buf[256]; /* Just an arbitrary value. */
74 const wchar_t *inbuf = *src;
75 size_t dummy;
77 result = 0;
78 data.__outbufend = buf + sizeof (buf);
82 data.__outbuf = buf;
84 status = DL_CALL_FCT (tomb->__fct,
85 (tomb, &data, (const unsigned char **) &inbuf,
86 (const unsigned char *) srcend, NULL,
87 &dummy, 0, 1));
89 /* Count the number of bytes. */
90 result += data.__outbuf - buf;
92 while (status == __GCONV_FULL_OUTPUT);
94 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
95 && data.__outbuf[-1] == '\0')
96 /* Don't count the NUL character in. */
97 --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 size_t dummy;
106 data.__outbuf = dst;
107 data.__outbufend = dst + len;
109 status = DL_CALL_FCT (tomb->__fct,
110 (tomb, &data, (const unsigned char **) src,
111 (const unsigned char *) srcend, NULL,
112 &dummy, 0, 1));
114 /* Count the number of bytes. */
115 result = data.__outbuf - (unsigned char *) 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 && data.__outbuf[-1] == '\0')
122 assert (data.__outbuf != (unsigned char *) dst);
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)
139 result = (size_t) -1;
140 __set_errno (EILSEQ);
143 return result;
145 weak_alias (__wcsnrtombs, wcsnrtombs)