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. */
24 #include <wcsmbsload.h>
29 # define EILSEQ EINVAL
33 /* This is the private state used if PS is NULL. */
34 static mbstate_t state;
36 /* This is a non-standard function but it is very useful in the
37 implementation of stdio because we have to deal with unterminated
38 buffers. At most NMC bytes will be converted. */
40 __mbsnrtowcs (dst, src, nmc, len, ps)
47 const unsigned char *srcend;
48 struct __gconv_step_data data;
51 struct __gconv_step *towc;
53 /* Tell where we want the result. */
54 data.__invocation_counter = 0;
55 data.__internal_use = 1;
57 data.__statep = ps ?: &state;
61 srcend = *src + __strnlen (*src, nmc - 1) + 1;
63 /* Make sure we use the correct function. */
64 update_conversion_ptrs ();
66 /* Get the structure with the function pointers. */
67 towc = __wcsmbs_gconv_fcts.towc;
69 /* We have to handle DST == NULL special. */
72 wchar_t buf[64]; /* Just an arbitrary size. */
73 const unsigned char *inbuf = *src;
75 data.__outbufend = (char *) buf + sizeof (buf);
78 data.__outbuf = (char *) buf;
80 status = (*towc->__fct) (__wcsmbs_gconv_fcts.towc, &data, &inbuf,
83 while (status == __GCONV_FULL_OUTPUT);
85 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
86 && ((wchar_t *) data.__outbuf)[-1] == L'\0')
87 /* Don't count the NUL character in. */
92 /* This code is based on the safe assumption that all internal
93 multi-byte encodings use the NUL byte only to mark the end
95 data.__outbuf = (unsigned char *) dst;
96 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
98 status = (*towc->__fct) (__wcsmbs_gconv_fcts.towc, &data,
99 (const unsigned char **) src, srcend,
102 /* We have to determine whether the last character converted
103 is the NUL character. */
104 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
105 && ((wchar_t *) dst)[result - 1] == L'\0')
108 assert (__mbsinit (data.__statep));
114 /* There must not be any problems with the conversion but illegal input
116 assert (status == __GCONV_OK || status != __GCONV_EMPTY_INPUT
117 || status == __GCONV_ILLEGAL_INPUT
118 || status == __GCONV_INCOMPLETE_INPUT
119 || status == __GCONV_FULL_OUTPUT);
121 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
122 && status != __GCONV_EMPTY_INPUT)
124 result = (size_t) -1;
125 __set_errno (EILSEQ);
130 weak_alias (__mbsnrtowcs, mbsnrtowcs)