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[glibc.git] / wcsmbs / wcrtomb.c
blobb546c7a9d39bfaa46ef95b356eab28a14e9dee0e
1 /* Copyright (C) 1996, 1997, 1998 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 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 <errno.h>
21 #include <gconv.h>
22 #include <stdlib.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 size_t
37 __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
39 char buf[MB_CUR_MAX];
40 struct gconv_step_data data;
41 int status;
42 size_t result;
43 size_t dummy;
45 /* Tell where we want the result. */
46 data.outbuf = s;
47 data.outbufend = s + MB_CUR_MAX;
48 data.invocation_counter = 0;
49 data.internal_use = 1;
50 data.is_last = 1;
51 data.statep = ps ?: &state;
53 /* A first special case is if S is NULL. This means put PS in the
54 initial state. */
55 if (s == NULL)
57 data.outbuf = buf;
58 wc = L'\0';
61 /* Make sure we use the correct function. */
62 update_conversion_ptrs ();
64 /* If WC is the NUL character we write into the output buffer the byte
65 sequence necessary for PS to get into the initial state, followed
66 by a NUL byte. */
67 if (wc == L'\0')
69 status = (*__wcsmbs_gconv_fcts.tomb->fct) (__wcsmbs_gconv_fcts.tomb,
70 &data, NULL, NULL, &dummy, 1);
72 if (status == GCONV_OK || status == GCONV_EMPTY_INPUT)
73 *data.outbuf++ = '\0';
75 else
77 /* Do a normal conversion. */
78 const unsigned char *inbuf = (const unsigned char *) &wc;
80 status = (*__wcsmbs_gconv_fcts.tomb->fct) (__wcsmbs_gconv_fcts.tomb,
81 &data, &inbuf,
82 inbuf + sizeof (wchar_t),
83 &dummy, 0);
86 /* There must not be any problems with the conversion but illegal input
87 characters. The output buffer must be large enough, otherwise the
88 definition of MB_CUR_MAX is not correct. All the other possible
89 errors also must not happen. */
90 assert (status == GCONV_OK || status == GCONV_EMPTY_INPUT
91 || status == GCONV_ILLEGAL_INPUT
92 || status == GCONV_INCOMPLETE_INPUT
93 || status == GCONV_FULL_OUTPUT);
95 if (status == GCONV_OK || status == GCONV_EMPTY_INPUT
96 || status == GCONV_FULL_OUTPUT)
97 result = data.outbuf - (unsigned char *) s;
98 else
100 result = (size_t) -1;
101 __set_errno (EILSEQ);
104 return result;
106 weak_alias (__wcrtomb, wcrtomb)