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
|
//========================================================================
//
// fread.cxx
//
// ANSI Stdio fread() function
//
//========================================================================
// ####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): jlarmour
// Contributors:
// Date: 2000-04-20
// Purpose:
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//=======================================================================
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common project-wide type definitions
#include <cyg/infra/cyg_ass.h> // Assertion support
#include <cyg/infra/cyg_trac.h> // Tracing support
#include <stddef.h> // NULL and size_t from compiler
#include <stdio.h> // header for this file
#include <errno.h> // error codes
#include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
// FUNCTIONS
externC size_t
fread( void *ptr, size_t object_size, size_t num_objects, FILE *stream ) __THROW
{
Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
cyg_ucount32 bytes_read;
cyg_ucount32 bytes_to_read;
cyg_ucount32 total_read;
Cyg_ErrNo err;
cyg_uint8 *ptrc = (cyg_uint8 *)ptr;
CYG_REPORT_FUNCNAMETYPE( "fread", "read %d objects" );
CYG_REPORT_FUNCARG4( "ptr=%08x, object_size=%d, num_objects=%d, "
"stream=%08x", ptr, object_size, num_objects,
stream );
bytes_to_read = object_size*num_objects;
total_read = 0;
if ( !bytes_to_read ) {
CYG_REPORT_RETVAL(0);
return 0;
} // if
err = real_stream->read( (cyg_uint8 *)ptr, bytes_to_read,
&bytes_read );
bytes_to_read -= bytes_read;
total_read += bytes_read;
ptrc += bytes_read;
while (!err && bytes_to_read) { // if no err, but not finished - get next
err = real_stream->refill_read_buffer();
if ( !err ) {
err = real_stream->read( (cyg_uint8 *)ptrc, bytes_to_read,
&bytes_read );
bytes_to_read -= bytes_read;
total_read += bytes_read;
ptrc += bytes_read;
} // if
} // while
if (err) {
if (err != EAGAIN) {
real_stream->set_error( err );
errno = err;
}
} // if
// we return the number of _objects_ read. Simple division is
// sufficient as this returns the quotient rather than rounding
CYG_REPORT_RETVAL( bytes_read/object_size );
return total_read/object_size;
} // fread()
// EOF fread.cxx
|
