1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
//===========================================================================
//
// mblen.cxx
//
// ISO standard mblen() routine
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jjohnstn
// Contributors: jjohnstn
// Date: 2000-11-01
// Purpose: Provide ISO C mblen()
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
//
// This code was based on newlib/libc/stdlib/mblen.c
// The following is modified from the original newlib description:
//
/*
FUNCTION
<<mblen>>---multibyte length function
INDEX
mblen
ANSI_SYNOPSIS
#include <stdlib.h>
int mblen(const char *<[s]>, size_t <[n]>);
TRAD_SYNOPSIS
#include <stdlib.h>
int mblen(<[s]>, <[n]>)
const char *<[s]>;
size_t <[n]>;
DESCRIPTION
When CYGINT_LIBC_I18N_MB_REQUIRED is not defined, this is a minimal ANSI-conforming
implementation of <<mblen>>. In this case, the
only ``multi-byte character sequences'' recognized are single bytes,
and thus <<1>> is returned unless <[s]> is the null pointer or
has a length of 0 or is the empty string.
When CYGINT_LIBC_I18N_MB_REQUIRED is defined, this routine calls the locale's LC_CTYPE mbtowc_fn to perform
the conversion, passing a state variable to allow state dependent
decoding. The result is based on the locale setting which may
be restricted to a defined set of locales.
RETURNS
This implementation of <<mblen>> returns <<0>> if
<[s]> is <<NULL>> or the empty string; it returns <<1>> if not CYGINT_LIBC_I18N_MB_REQUIRED or
the character is a single-byte character; it returns <<-1>>
if the multi-byte character is invalid; otherwise it returns
the number of bytes in the multibyte character.
PORTABILITY
<<mblen>> is required in the ANSI C standard. However, the precise
effects vary with the locale.
<<mblen>> requires no supporting OS subroutines.
*/
// CONFIGURATION
#include <pkgconf/libc_i18n.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions
#include <cyg/infra/cyg_trac.h> // Tracing support
#include <cyg/infra/cyg_ass.h> // Assertion support
#include <locale.h>
#include <stdlib.h> // Header for this file
#include <string.h> // strcmp definition
#include <stddef.h> // size_t definition
#include "internal.h" // __current_ctype_locale definition
#ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
# include <pkgconf/kernel.h> // kernel configuration
# include <cyg/kernel/thread.hxx> // per-thread data
# include <cyg/kernel/thread.inl> // per-thread data
# include <cyg/kernel/mutex.hxx> // mutexes
#endif /* CYGSEM_LIBC_I18N_PER_THREAD_MB */
// TRACE
#if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_I18N_MBLEN_TRACE_LEVEL)
static int mblen_trace = CYGNUM_LIBC_I18N_MBLEN_TRACE_LEVEL;
# define TL1 (0 < mblen_trace)
#else
# define TL1 (0)
#endif
// STATICS
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
# ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
static volatile Cyg_Thread::cyg_data_index
mblen_data_index=CYGNUM_KERNEL_THREADS_DATA_MAX;
static Cyg_Mutex mblen_data_mutex CYG_INIT_PRIORITY(LIBC);
# else
static int cyg_libc_mblen_last;
# endif
#endif
// FUNCTIONS
int
mblen ( const char *s, size_t n )
{
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
int *state;
#endif
int retval;
CYG_REPORT_FUNCNAMETYPE( "mblen", "returning %d" );
CYG_REPORT_FUNCARG2( "s=%08x, n=%ud", s, n );
if (s != NULL)
CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
#ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
Cyg_Thread *self = Cyg_Thread::self();
// Get a per-thread data slot if we haven't got one already
// Do a simple test before locking and retrying test, as this is a
// rare situation
if (CYGNUM_KERNEL_THREADS_DATA_MAX==mblen_data_index) {
mblen_data_mutex.lock();
if (CYGNUM_KERNEL_THREADS_DATA_MAX==mblen_data_index) {
// FIXME: Should use real CDL to pre-allocate a slot at compile
// time to ensure there are enough slots
mblen_data_index = self->new_data_index();
CYG_ASSERT(mblen_data_index >= 0, "failed to allocate data index" );
}
mblen_data_mutex.unlock();
} // if
// we have a valid index now
state = (int *)self->get_data_ptr(mblen_data_index);
#else /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */
state = &cyg_libc_mblen_last;
#endif /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */
CYG_TRACE2( TL1, "Retrieved mblen_last address %08x containing %d",
state, *state );
if (__current_ctype_locale->mbtowc_fn)
{
retval = __current_ctype_locale->mbtowc_fn (NULL, s, n, state);
CYG_REPORT_RETVAL( retval );
return retval;
}
#endif /* CYGINT_LIBC_I18N_MB_REQUIRED */
if (s == NULL || *s == '\0')
retval = 0;
else if (n == 0)
retval = -1;
else
retval = 1;
CYG_REPORT_RETVAL( retval );
return retval;
} // mblen()
// EOF mblen.cxx
|
