2 /***************************************************************************
3 * charpool.cc -- Handles Nmap's "character pool" memory allocation *
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98 ***************************************************************************/
100 /* $Id: charpool.cc 3869 2006-08-25 01:47:49Z fyodor $ */
103 /* Character pool memory allocation */
104 #include "charpool.h"
106 static char *charpool[16];
107 static int currentcharpool;
108 static int currentcharpoolsz;
109 static char *nextchar;
111 #define ALIGN_ON sizeof(char *)
113 static int cp_init(void) {
114 static int charpool_initialized = 0;
115 if (charpool_initialized) return 0;
117 /* Create our char pool */
119 currentcharpoolsz = 16384;
120 nextchar = charpool[0] = (char *) safe_malloc(currentcharpoolsz);
121 charpool_initialized = 1;
127 for(ccp=0; ccp <= currentcharpool; ccp++)
130 charpool[ccp] = NULL;
135 static inline void cp_grow(void) {
136 /* Doh! We've got to make room */
137 if (++currentcharpool > 15) {
138 fatal("Character Pool is out of buckets!");
140 currentcharpoolsz <<= 1;
142 nextchar = charpool[currentcharpool] = (char *)
143 safe_malloc(currentcharpoolsz);
146 void *cp_alloc(int sz) {
152 if ((modulus = sz % ALIGN_ON))
153 sz += ALIGN_ON - modulus;
155 if ((nextchar - charpool[currentcharpool]) + sz <= currentcharpoolsz) {
160 /* Doh! We've got to make room */
167 char *cp_strdup(const char *src) {
170 /* end points to the first illegal char */
176 end = charpool[currentcharpool] + currentcharpoolsz;
179 while((nextchar < end) && *p) {
183 if (nextchar < end) {
184 /* Goody, we have space */
186 if ((modulus = (nextchar - q) % ALIGN_ON))
187 nextchar += ALIGN_ON - modulus;
191 /* Doh! We ran out -- need to allocate more */
194 return cp_strdup(src);