Sparc memchr/memcmp/strncmp fixes from Il'ya Malakhov.
[glibc.git] / wcsmbs / mbsnrtowcs.c
blob9c354a939b38769590ad03ed6397e50df1dc9a2b
1 /* Copyright (C) 1996-2015 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 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, see
17 <http://www.gnu.org/licenses/>. */
19 #include <assert.h>
20 #include <dlfcn.h>
21 #include <errno.h>
22 #include <gconv.h>
23 #include <string.h>
24 #include <wchar.h>
25 #include <wcsmbsload.h>
27 #include <sysdep.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 /* This is a non-standard function but it is very useful in the
38 implementation of stdio because we have to deal with unterminated
39 buffers. At most NMC bytes will be converted. */
40 size_t
41 __mbsnrtowcs (dst, src, nmc, len, ps)
42 wchar_t *dst;
43 const char **src;
44 size_t nmc;
45 size_t len;
46 mbstate_t *ps;
48 const unsigned char *srcend;
49 struct __gconv_step_data data;
50 size_t result;
51 int status;
52 struct __gconv_step *towc;
53 size_t dummy;
54 const struct gconv_fcts *fcts;
56 /* Tell where we want the result. */
57 data.__invocation_counter = 0;
58 data.__internal_use = 1;
59 data.__flags = __GCONV_IS_LAST;
60 data.__statep = ps ?: &state;
62 if (nmc == 0)
63 return 0;
64 srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1;
66 /* Get the conversion functions. */
67 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
69 /* Get the structure with the function pointers. */
70 towc = fcts->towc;
71 __gconv_fct fct = towc->__fct;
72 #ifdef PTR_DEMANGLE
73 if (towc->__shlib_handle != NULL)
74 PTR_DEMANGLE (fct);
75 #endif
77 /* We have to handle DST == NULL special. */
78 if (dst == NULL)
80 mbstate_t temp_state;
81 wchar_t buf[64]; /* Just an arbitrary size. */
82 const unsigned char *inbuf = (const unsigned char *) *src;
84 temp_state = *data.__statep;
85 data.__statep = &temp_state;
87 result = 0;
88 data.__outbufend = (unsigned char *) buf + sizeof (buf);
91 data.__outbuf = (unsigned char *) buf;
93 status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL,
94 &dummy, 0, 1));
96 result += (wchar_t *) data.__outbuf - buf;
98 while (status == __GCONV_FULL_OUTPUT);
100 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
101 && ((wchar_t *) data.__outbuf)[-1] == L'\0')
102 /* Don't count the NUL character in. */
103 --result;
105 else
107 /* This code is based on the safe assumption that all internal
108 multi-byte encodings use the NUL byte only to mark the end
109 of the string. */
110 data.__outbuf = (unsigned char *) dst;
111 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
113 status = DL_CALL_FCT (fct,
114 (towc, &data, (const unsigned char **) src, srcend,
115 NULL, &dummy, 0, 1));
117 result = (wchar_t *) data.__outbuf - dst;
119 /* We have to determine whether the last character converted
120 is the NUL character. */
121 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
122 && (assert (result > 0),
123 ((wchar_t *) dst)[result - 1] == L'\0'))
125 assert (__mbsinit (data.__statep));
126 *src = NULL;
127 --result;
131 /* There must not be any problems with the conversion but illegal input
132 characters. */
133 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
134 || status == __GCONV_ILLEGAL_INPUT
135 || status == __GCONV_INCOMPLETE_INPUT
136 || status == __GCONV_FULL_OUTPUT);
138 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
139 && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
141 result = (size_t) -1;
142 __set_errno (EILSEQ);
145 return result;
147 weak_alias (__mbsnrtowcs, mbsnrtowcs)