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[glibc.git] / wcsmbs / btowc.c
blobbac99e854761012ab63dda8346404fe2ce9e5c7d
1 /* Copyright (C) 1996, 1997, 1998, 1999 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 Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <gconv.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <wchar.h>
24 #include <wcsmbsload.h>
25 #include <limits.h>
28 wint_t
29 __btowc (c)
30 int c;
32 wchar_t result;
33 struct gconv_step_data data;
34 char inbuf[1];
35 const char *inptr = inbuf;
36 size_t dummy;
37 int status;
39 /* If the parameter does not fit into one byte or it is the EOF value
40 we can give the answer now. */
41 if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
42 return WEOF;
44 /* Tell where we want the result. */
45 data.outbuf = (char *) &result;
46 data.outbufend = data.outbuf + sizeof (wchar_t);
47 data.invocation_counter = 0;
48 data.internal_use = 1;
49 data.is_last = 1;
50 data.statep = &data.__state;
52 /* Make sure we start in the initial state. */
53 memset (&data.__state, '\0', sizeof (mbstate_t));
55 /* Make sure we use the correct function. */
56 update_conversion_ptrs ();
58 /* Create the input string. */
59 inbuf[0] = c;
61 status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc, &data,
62 &inptr, inptr + 1, &dummy, 0);
63 /* The conversion failed. */
64 if (status != GCONV_OK && status != GCONV_FULL_OUTPUT
65 && status != GCONV_EMPTY_INPUT)
66 result = WEOF;
68 return result;
70 weak_alias (__btowc, btowc)