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/* Arena-based memory management */
#include "config.h"
#define SIZE_AREA 1024000
struct area {
struct area * next;
char data[SIZE_AREA];
};
struct area * arena_head;
struct area * arena_cur;
int arena_cur_ofs;
void arena_init(void)
{
arena_head = malloc(sizeof(struct area));
if (arena_head == NULL) {
fprintf(stderr, "Out of memory\n");
exit(2);
}
arena_head->next = NULL;
arena_cur = arena_head;
arena_cur_ofs = 0;
}
void arena_clear(void)
{
arena_cur = arena_head;
arena_cur_ofs = 0;
}
void * arena_alloc(int size)
{
char * res;
struct area * n;
if (size >= SIZE_AREA) {
fprintf(stderr, "Memory request too large (%d)\n", size);
exit(2);
}
if (arena_cur_ofs + size <= SIZE_AREA) {
res = arena_cur->data + arena_cur_ofs;
arena_cur_ofs += size;
return res;
}
if (arena_cur->next == NULL) {
n = malloc(sizeof(struct area));
if (n == NULL) {
fprintf(stderr, "Out of memory\n");
exit(2);
}
n->next = NULL;
arena_cur->next = n;
}
arena_cur = arena_cur->next;
arena_cur_ofs = size;
return arena_cur->data;
}
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