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[glibc.git] / wcsmbs / wctob.c
blobb85ba6dd8ff51a6178887f45450cbafeba23de97
1 /* Copyright (C) 1996-2000, 2002, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 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 <gconv.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <wchar.h>
25 #include <wcsmbsload.h>
28 int
29 wctob (c)
30 wint_t c;
32 char buf[MB_LEN_MAX];
33 struct __gconv_step_data data;
34 wchar_t inbuf[1];
35 wchar_t *inptr = inbuf;
36 size_t dummy;
37 int status;
38 const struct gconv_fcts *fcts;
40 if (c == WEOF)
41 return EOF;
43 /* Tell where we want the result. */
44 data.__outbuf = buf;
45 data.__outbufend = buf + MB_LEN_MAX;
46 data.__invocation_counter = 0;
47 data.__internal_use = 1;
48 data.__flags = __GCONV_IS_LAST;
49 data.__statep = &data.__state;
50 data.__trans = NULL;
52 /* Make sure we start in the initial state. */
53 memset (&data.__state, '\0', sizeof (mbstate_t));
55 /* Get the conversion functions. */
56 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
58 /* Create the input string. */
59 inbuf[0] = c;
61 const unsigned char *argptr = (const unsigned char *) inptr;
62 status = DL_CALL_FCT (fcts->tomb->__fct,
63 (fcts->tomb, &data, &argptr,
64 argptr + sizeof (inbuf[0]), NULL, &dummy, 0, 1));
66 /* The conversion failed or the output is too long. */
67 if ((status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
68 && status != __GCONV_EMPTY_INPUT)
69 || data.__outbuf != (unsigned char *) (buf + 1))
70 return EOF;
72 return (unsigned char) buf[0];