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[glibc.git] / wcsmbs / wcrtomb.c
blob38144796f841e8fc87670b12a1bc4610c8d8eb39
1 /* Copyright (C) 1996,1997,1998,2000,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 <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 __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
40 char buf[MB_CUR_MAX];
41 struct __gconv_step_data data;
42 int status;
43 size_t result;
44 size_t dummy;
45 const struct gconv_fcts *fcts;
47 /* Set information for this step. */
48 data.__invocation_counter = 0;
49 data.__internal_use = 1;
50 data.__flags = __GCONV_IS_LAST;
51 data.__statep = ps ?: &state;
52 data.__trans = NULL;
54 /* A first special case is if S is NULL. This means put PS in the
55 initial state. */
56 if (s == NULL)
58 s = buf;
59 wc = L'\0';
62 /* Tell where we want to have the result. */
63 data.__outbuf = s;
64 data.__outbufend = s + MB_CUR_MAX;
66 /* Get the conversion functions. */
67 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
69 /* If WC is the NUL character we write into the output buffer the byte
70 sequence necessary for PS to get into the initial state, followed
71 by a NUL byte. */
72 if (wc == L'\0')
74 status = DL_CALL_FCT (fcts->tomb->__fct,
75 (fcts->tomb, &data, NULL, NULL,
76 NULL, &dummy, 1, 1));
78 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
79 *data.__outbuf++ = '\0';
81 else
83 /* Do a normal conversion. */
84 const unsigned char *inbuf = (const unsigned char *) &wc;
86 status = DL_CALL_FCT (fcts->tomb->__fct,
87 (fcts->tomb, &data, &inbuf,
88 inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
91 /* There must not be any problems with the conversion but illegal input
92 characters. The output buffer must be large enough, otherwise the
93 definition of MB_CUR_MAX is not correct. All the other possible
94 errors also must not happen. */
95 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
96 || status == __GCONV_ILLEGAL_INPUT
97 || status == __GCONV_INCOMPLETE_INPUT
98 || status == __GCONV_FULL_OUTPUT);
100 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
101 || status == __GCONV_FULL_OUTPUT)
102 result = data.__outbuf - (unsigned char *) s;
103 else
105 result = (size_t) -1;
106 __set_errno (EILSEQ);
109 return result;
111 weak_alias (__wcrtomb, wcrtomb)
112 libc_hidden_weak (wcrtomb)