home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 35 Internet
/
35-Internet.zip
/
nuweb087.zip
/
arena.c
next >
Wrap
C/C++ Source or Header
|
1996-02-28
|
971b
|
49 lines
#include "global.h"
typedef struct chunk {
struct chunk *next;
char *limit;
char *avail;
} Chunk;
static Chunk first = { NULL, NULL, NULL };
static Chunk *arena = &first;
void *arena_getmem(n)
size_t n;
{
char *q;
char *p = arena->avail;
n = (n + 7) & ~7; /* ensuring alignment to 8 bytes */
q = p + n;
if (q <= arena->limit) {
arena->avail = q;
return p;
}
{
Chunk *ap = arena;
Chunk *np = ap->next;
while (np) {
char *v = sizeof(Chunk) + (char *) np;
if (v + n <= np->limit) {
np->avail = v + n;
arena = np;
return v;
}
ap = np;
np = ap->next;
}
{
size_t m = n + 10000;
np = (Chunk *) malloc(m);
np->limit = m + (char *) np;
np->avail = n + sizeof(Chunk) + (char *) np;
np->next = NULL;
ap->next = np;
arena = np;
return sizeof(Chunk) + (char *) np;
}
}
}
void arena_free()
{
arena = &first;
}