File: pi-buffer.c

package info (click to toggle)
pilot-link 0.12.5-dfsg-2
  • links: PTS
  • area: main
  • in suites: buster, stretch
  • size: 6,868 kB
  • ctags: 5,811
  • sloc: ansic: 53,153; sh: 10,459; java: 2,584; perl: 2,247; python: 1,044; makefile: 991; yacc: 662; cpp: 551; xml: 39
file content (117 lines) | stat: -rw-r--r-- 2,796 bytes parent folder | download | duplicates (5)
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
/*
 * $Id: pi-buffer.c,v 1.10 2006/10/12 14:21:22 desrod Exp $
 *
 * pi-buffer.c:  simple data block management for variable data storage
 *
 * Copyright (c) 2004-2005, Florent Pillet.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This library 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 Library
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "pi-buffer.h"

pi_buffer_t*
pi_buffer_new (size_t capacity) 
{
	pi_buffer_t* buf;
	buf = (struct pi_buffer_t *) malloc (sizeof (struct pi_buffer_t));
	if (buf == NULL)
		return NULL;

	if (capacity <= 0)
		capacity = 16;	/* allocating 0 byte is illegal - use a small value instead */

	buf->data = (unsigned char *) malloc (capacity);
	if (buf->data == NULL) {
		free (buf);
		return NULL;
	}

	buf->allocated = capacity;
	buf->used = 0;
	return buf;
}

pi_buffer_t*
pi_buffer_expect (pi_buffer_t *buf, size_t expect)
{
	if ((buf->allocated - buf->used) >= expect)
		return buf;

	if (buf->data)
		buf->data = (unsigned char *) realloc (buf->data, buf->used + expect);
	else
		buf->data = (unsigned char *) malloc (expect);

	if (buf->data == NULL) {
		buf->allocated = 0;
		buf->used = 0;
		return NULL;
	}

	buf->allocated = buf->used + expect;
	return buf;
}

pi_buffer_t*
pi_buffer_append (pi_buffer_t *buf, const void *data, size_t len)
{
	if (pi_buffer_expect (buf, len) == NULL)
		return NULL;

	memcpy (buf->data + buf->used, data, len);
	buf->used += len;

	return buf;
}

pi_buffer_t *
pi_buffer_append_buffer (pi_buffer_t *dest, const pi_buffer_t *src)
{
	return pi_buffer_append (dest, src->data, src->used);
}

void
pi_buffer_clear (pi_buffer_t *buf)
{
	buf->used = 0;
	if (buf->allocated > (size_t)65535)
	{
		buf->data = (unsigned char *) realloc (buf->data, 65535);
		buf->allocated = (buf->data == NULL) ? 0 : 65535;
	}
}

void
pi_buffer_free (pi_buffer_t* buf)
{
	if (buf) {
		if (buf->data)
			free (buf->data);
		free (buf);
	}
}

/* vi: set ts=8 sw=4 sts=4 noexpandtab: cin */
/* ex: set tabstop=4 expandtab: */
/* Local Variables: */
/* indent-tabs-mode: t */
/* c-basic-offset: 8 */
/* End: */