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OS/2 Shareware BBS: 35 Internet
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nmap254b.zip
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charpool.c
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C/C++ Source or Header
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2001-03-07
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5KB
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138 lines
/***********************************************************************/
/* charpool.c -- Handles Nmap's "character pool" memory allocation */
/* system. */
/* */
/***********************************************************************/
/* The Nmap Security Scanner is (C) 1995-2001 Insecure.Com LLC. This */
/* program 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; Version 2. This guarantees your */
/* right to use, modify, and redistribute this software under certain */
/* conditions. If this license is unacceptable to you, we may be */
/* willing to sell alternative licenses (contact sales@insecure.com). */
/* */
/* If you received these files with a written license agreement */
/* stating terms other than the (GPL) terms above, then that */
/* alternative license agreement takes precendence over this comment. */
/* */
/* Source is provided to this software because we believe users have */
/* a right to know exactly what a program is going to do before they */
/* run it. This also allows you to audit the software for security */
/* holes (none have been found so far). */
/* */
/* Source code also allows you to port Nmap to new platforms, fix */
/* bugs, and add new features. You are highly encouraged to send */
/* your changes to fyodor@insecure.org for possible incorporation */
/* into the main distribution. By sending these changes to Fyodor or */
/* one the insecure.org development mailing lists, it is assumed that */
/* you are offering Fyodor the unlimited, non-exclusive right to */
/* reuse, modify, and relicense the code. This is important because */
/* the inability to relicense code has caused devastating problems */
/* for other Free Software projects (such as KDE and NASM). Nmap */
/* will always be available Open Source. If you wish to specify */
/* special license conditions of your contributions, just say so */
/* when you send them. */
/* */
/* This program 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 ( */
/* http://www.gnu.org/copyleft/gpl.html ). */
/* */
/***********************************************************************/
/* $Id: charpool.c,v 1.5 2001/03/07 20:34:56 fyodor Exp $ */
/* Character pool memory allocation */
#include "charpool.h"
static char *charpool[16];
static int currentcharpool;
static int currentcharpoolsz;
static char *nextchar;
static int charpool_initialized = 0;
#define ALIGN_ON sizeof(char *)
static int cp_init(void) {
/* Create our char pool */
currentcharpool = 0;
currentcharpoolsz = 16384;
nextchar = charpool[0] = (char *) safe_malloc(currentcharpoolsz);
charpool_initialized = 1;
return 0;
}
static inline void cp_grow(void) {
/* Doh! We've got to make room */
if (++currentcharpool > 15) {
fatal("Character Pool is out of buckets!");
}
currentcharpoolsz <<= 1;
nextchar = charpool[currentcharpool] = (char *)
safe_malloc(currentcharpoolsz);
}
static inline void cp_align(void) {
int res;
if ((res = (nextchar - charpool[currentcharpool]) % ALIGN_ON)) {
nextchar += ALIGN_ON - res;
}
return;
}
void *cp_alloc(int sz) {
char *p;
int modulus;
if (!charpool_initialized) cp_init();
if ((modulus = sz % ALIGN_ON))
sz += modulus;
if ((nextchar - charpool[currentcharpool]) + sz <= currentcharpoolsz) {
p = nextchar;
nextchar += sz;
return p;
}
/* Doh! We've got to make room */
cp_grow();
return cp_alloc(sz);
}
char *cp_strdup(const char *src) {
const char *p;
char *q;
/* end points to the first illegal char */
char *end;
int modulus;
if (!charpool_initialized)
cp_init();
end = charpool[currentcharpool] + currentcharpoolsz;
q = nextchar;
p = src;
while((nextchar < end) && *p) {
*nextchar++ = *p++;
}
if (nextchar < end) {
/* Goody, we have space */
*nextchar++ = '\0';
if ((modulus = (nextchar - q) % ALIGN_ON))
nextchar += ALIGN_ON - modulus;
return q;
}
/* Doh! We ran out -- need to allocate more */
cp_grow();
return cp_strdup(src);
}