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
|
/* $Id: buffer.c,v 1.4 1999/03/10 07:58:02 boyns Exp $ */
/*
* Copyright (C) 1993-99 Mark R. Boyns <boyns@doit.org>
*
* This file is part of rplay.
*
* rplay 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 of the License, or
* (at your option) any later version.
*
* rplay 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 rplay; see the file COPYING. If not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include "rplayd.h"
#include "buffer.h"
static BUFFER *buffers = NULL;
static int nbuffers = 0; /* number of buffers on the free list */
static int next_id = 0; /* next buffer id number */
#ifdef __STDC__
BUFFER *
buffer_create(void)
#else
BUFFER *
buffer_create()
#endif
{
BUFFER *b;
if (buffers == NULL)
{
b = (BUFFER *) malloc(sizeof(BUFFER));
if (b == NULL)
{
report(REPORT_ERROR, "buffer_create: out of memory\n");
done(1);
}
b->id = ++next_id;
}
else
{
nbuffers--;
b = buffers;
buffers = buffers->next;
}
b->nbytes = 0;
b->buf[0] = '\0';
b->status = BUFFER_FREE;
b->offset = 0;
b->next = NULL;
return b;
}
#ifdef __STDC__
void
buffer_destroy(BUFFER *b)
#else
void
buffer_destroy(b)
BUFFER *b;
#endif
{
if (b == NULL || b->status == BUFFER_KEEP)
{
/* Do nothing. */
return;
}
else if (b->status == BUFFER_REUSE)
{
/* Always put REUSE buffers on the free list. This will
probably cause rplayd to grow bigger, but it prevents
problems with calling free() inside the timer
interrupt. */
nbuffers++;
b->next = buffers;
buffers = b;
}
else
{
/* Free the buffer. */
free((char *) b);
}
}
/*
* Allocate enough buffers to hold nbytes.
*/
#ifdef __STDC__
BUFFER *
buffer_alloc(int nbytes, int type)
#else
BUFFER *
buffer_alloc(nbytes, type)
int nbytes;
int type;
#endif
{
BUFFER *head, **next = &head;
do
{
*next = buffer_create();
nbytes -= BUFFER_SIZE;
(*next)->status = type;
next = &(*next)->next;
}
while (nbytes > 0);
*next = NULL;
return head;
}
#ifdef __STDC__
void
buffer_dealloc(BUFFER *b, int force)
#else
void
buffer_dealloc(b, force)
BUFFER *b;
int force;
#endif
{
BUFFER *next;
while (b)
{
next = b->next;
if (force)
{
b->status = BUFFER_FREE;
}
buffer_destroy(b);
b = next;
}
}
#ifdef __STDC__
void
buffer_cleanup(void)
#else
void
buffer_cleanup()
#endif
{
BUFFER *b;
report(REPORT_DEBUG, "cleaning up buffers - %d bytes\n", nbuffers * BUFFER_SIZE);
while (buffers)
{
b = buffers;
buffers = buffers->next;
free((char *) b);
}
buffers = NULL;
nbuffers = 0;
next_id = 0;
}
#ifdef __STDC__
int
buffer_nbytes(BUFFER *b)
#else
int
buffer_nbytes(b)
BUFFER *b;
#endif
{
int n = 0;
while (b)
{
n += b->nbytes;
b = b->next;
}
return n;
}
|
