lib.c revision 48907 
1/*
2 * Copyright (c) 1999 Global Technology Associates, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 *	$Id:$
27 */
28
29#include <sys/types.h>
30#include <stddef.h>
31
32#include "kgzldr.h"
33
34#define MEMSIZ  0x8000		/* Memory pool size */
35
36int kgz_con;			/* Console control */
37
38static size_t memtot;		/* Memory allocated: bytes */
39static u_int memcnt;		/* Memory allocated: blocks */
40
41/*
42 * Library functions required by inflate().
43 */
44
45/*
46 * Allocate memory block.
47 */
48unsigned char *
49kzipmalloc(int size)
50{
51    static u_char mem[MEMSIZ];
52    void *ptr;
53
54    if (memtot + size > MEMSIZ)
55        return NULL;
56    ptr = mem + memtot;
57    memtot += size;
58    memcnt++;
59    return ptr;
60}
61
62/*
63 * Free allocated memory block.
64 */
65void
66kzipfree(void *ptr)
67{
68    memcnt--;
69    if (!memcnt)
70        memtot = 0;
71}
72
73/*
74 * Write a string to the console.
75 */
76void
77putstr(const char *str)
78{
79    int c;
80
81    while ((c = *str++)) {
82        if (kgz_con & KGZ_CRT)
83            crt_putchr(c);
84        if (kgz_con & KGZ_SIO)
85            sio_putchr(c);
86    }
87}
88