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charpool.cc
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charpool.cc
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/***************************************************************************
* charpool.cc -- Handles Nmap's "character pool" memory allocation *
* system. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2020 Insecure.Com LLC ("The Nmap *
* Project"). Nmap is also a registered trademark of the Nmap Project. *
* *
* This program is distributed under the terms of the Nmap Public Source *
* License (NPSL). The exact license text applying to a particular Nmap *
* release or source code control revision is contained in the LICENSE *
* file distributed with that version of Nmap or source code control *
* revision. More Nmap copyright/legal information is available from *
* https://nmap.org/book/man-legal.html, and further information on the *
* NPSL license itself can be found at https://nmap.org/npsl. This header *
* summarizes some key points from the Nmap license, but is no substitute *
* for the actual license text. *
* *
* Nmap is generally free for end users to download and use themselves, *
* including commercial use. It is available from https://nmap.org. *
* *
* The Nmap license generally prohibits companies from using and *
* redistributing Nmap in commercial products, but we sell a special Nmap *
* OEM Edition with a more permissive license and special features for *
* this purpose. See https://nmap.org/oem *
* *
* If you have received a written Nmap license agreement or contract *
* stating terms other than these (such as an Nmap OEM license), you may *
* choose to use and redistribute Nmap under those terms instead. *
* *
* The official Nmap Windows builds include the Npcap software *
* (https://npcap.org) for packet capture and transmission. It is under *
* separate license terms which forbid redistribution without special *
* permission. So the official Nmap Windows builds may not be *
* redistributed without special permission (such as an Nmap OEM *
* license). *
* *
* 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. *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to submit your *
* changes as a Github PR or by email to the dev@nmap.org mailing list *
* for possible incorporation into the main distribution. Unless you *
* specify otherwise, it is understood that you are offering us very *
* broad rights to use your submissions as described in the Nmap Public *
* Source License Contributor Agreement. This is important because we *
* fund the project by selling licenses with various terms, and also *
* because the inability to relicense code has caused devastating *
* problems for other Free Software projects (such as KDE and NASM). *
* *
* The free version of Nmap 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. Warranties, *
* indemnification and commercial support are all available through the *
* Npcap OEM program--see https://nmap.org/oem. *
* *
***************************************************************************/
/* $Id$ */
#include <stddef.h>
#include "nbase.h"
/* Character pool memory allocation */
#include "charpool.h"
#include "nmap_error.h"
static char *charpool[16];
static int currentcharpool;
static int currentcharpoolsz;
static char *nextchar;
/* Allocated blocks are allocated to multiples of ALIGN_ON. This is the
definition used by the malloc in Glibc 2.7, which says that it "suffices for
nearly all current machines and C compilers." */
#define ALIGN_ON (2 * sizeof(size_t))
static int cp_init(void) {
static int charpool_initialized = 0;
if (charpool_initialized) return 0;
/* Create our char pool */
currentcharpool = 0;
currentcharpoolsz = 16384;
nextchar = charpool[0] = (char *) safe_malloc(currentcharpoolsz);
charpool_initialized = 1;
return 0;
}
void cp_free(void) {
int ccp;
for(ccp=0; ccp <= currentcharpool; ccp++)
if(charpool[ccp]){
free(charpool[ccp]);
charpool[ccp] = NULL;
}
currentcharpool = 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);
}
void *cp_alloc(int sz) {
char *p;
int modulus;
cp_init();
if ((modulus = sz % ALIGN_ON))
sz += ALIGN_ON - 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;
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);
}