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[glibc/history.git] / wcsmbs / wcsnrtombs.c
blobeead26fb3cc4edac5b187e8c915f31267e7d6c15
1 /* Copyright (C) 1996-2000, 2002, 2003, 2005 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 <assert.h>
21 #include <dlfcn.h>
22 #include <errno.h>
23 #include <gconv.h>
24 #include <wchar.h>
25 #include <wcsmbsload.h>
27 #include <sysdep.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 /* This is a non-standard function but it is very useful in the
38 implementation of stdio because we have to deal with unterminated
39 buffers. At most NWC wide character will be converted. */
40 size_t
41 __wcsnrtombs (dst, src, nwc, len, ps)
42 char *dst;
43 const wchar_t **src;
44 size_t nwc;
45 size_t len;
46 mbstate_t *ps;
48 struct __gconv_step_data data;
49 const wchar_t *srcend;
50 int status;
51 size_t result;
52 struct __gconv_step *tomb;
53 const struct gconv_fcts *fcts;
55 /* Tell where we want the result. */
56 data.__invocation_counter = 0;
57 data.__internal_use = 1;
58 data.__flags = __GCONV_IS_LAST;
59 data.__statep = ps ?: &state;
60 data.__trans = NULL;
62 if (nwc == 0)
63 return 0;
64 srcend = *src + __wcsnlen (*src, nwc - 1) + 1;
66 /* Get the conversion functions. */
67 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
69 /* Get the structure with the function pointers. */
70 tomb = fcts->tomb;
71 __gconv_fct fct = tomb->__fct;
72 #ifdef PTR_DEMANGLE
73 if (tomb->__shlib_handle != NULL)
74 PTR_DEMANGLE (fct);
75 #endif
77 /* We have to handle DST == NULL special. */
78 if (dst == NULL)
80 mbstate_t temp_state;
81 unsigned char buf[256]; /* Just an arbitrary value. */
82 const unsigned char *inbuf = (const unsigned char *) *src;
83 size_t dummy;
85 temp_state = *data.__statep;
86 data.__statep = &temp_state;
88 result = 0;
89 data.__outbufend = buf + sizeof (buf);
93 data.__outbuf = buf;
95 status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
96 (const unsigned char *) srcend, NULL,
97 &dummy, 0, 1));
99 /* Count the number of bytes. */
100 result += data.__outbuf - buf;
102 while (status == __GCONV_FULL_OUTPUT);
104 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
105 && data.__outbuf[-1] == '\0')
106 /* Don't count the NUL character in. */
107 --result;
109 else
111 /* This code is based on the safe assumption that all internal
112 multi-byte encodings use the NUL byte only to mark the end
113 of the string. */
114 size_t dummy;
116 data.__outbuf = (unsigned char *) dst;
117 data.__outbufend = (unsigned char *) dst + len;
119 status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
120 (const unsigned char *) srcend, NULL,
121 &dummy, 0, 1));
123 /* Count the number of bytes. */
124 result = data.__outbuf - (unsigned char *) dst;
126 /* We have to determine whether the last character converted
127 is the NUL character. */
128 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
129 && data.__outbuf[-1] == '\0')
131 assert (data.__outbuf != (unsigned char *) dst);
132 assert (__mbsinit (data.__statep));
133 *src = NULL;
134 --result;
138 /* There must not be any problems with the conversion but illegal input
139 characters. */
140 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
141 || status == __GCONV_ILLEGAL_INPUT
142 || status == __GCONV_INCOMPLETE_INPUT
143 || status == __GCONV_FULL_OUTPUT);
145 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
146 && status != __GCONV_EMPTY_INPUT)
148 result = (size_t) -1;
149 __set_errno (EILSEQ);
152 return result;
154 weak_alias (__wcsnrtombs, wcsnrtombs)