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#include "ez_arena.h"
#include "log.h"
#include <stdlib.h>
#include <string.h>
ez_arena_t *ez_arena_create(u64 size, b32 zero_out) {
ez_arena_t *alloc = malloc(size + sizeof(ez_arena_t));
if (!alloc) {
log_error("Failed to malloc arena memory");
return NULL;
}
if (zero_out) {
memset((u8*)alloc+EZ_ARENA_BASE_POS, 0, size);
}
*alloc = (ez_arena_t){ .alloc_size = size, .pos = EZ_ARENA_BASE_POS };
#ifndef NLOG_TRACE
log_trace("Created ez_arena; size %lu", size);
#endif /* ifndef NLOG_TRACE */
return alloc;
}
void *ez_arena_alloc(ez_arena_t *arena, u64 alloc_amount) {
u64 pos_aligned = ALIGN_UP_POW2(arena->pos, ARENA_ALIGN);
u64 new_pos = pos_aligned + alloc_amount;
if (new_pos > arena->alloc_size + sizeof(ez_arena_t)) { return NULL; }
arena->pos = new_pos;
u8* out = (u8*)arena + pos_aligned;
memset(out, 0, alloc_amount);
return out;
}
void *ez_arena_alloc_nz(ez_arena_t *arena, u64 alloc_amount) {
u64 pos_aligned = ALIGN_UP_POW2(arena->pos, ARENA_ALIGN);
u64 new_pos = pos_aligned + alloc_amount;
if (new_pos > arena->alloc_size + sizeof(ez_arena_t)) { return NULL; }
arena->pos = new_pos;
return (u8*)arena + pos_aligned;
}
void ez_arena_clear(ez_arena_t *arena, b32 zero_out) {
if (zero_out) {
memset((u8*)arena+EZ_ARENA_BASE_POS, 0, arena->alloc_size);
}
arena->pos = EZ_ARENA_BASE_POS;
}
void ez_arena_destroy(ez_arena_t *arena) {
free(arena);
#ifndef NLOG_TRACE
log_trace("Destroyed ez_arena");
#endif /* ifndef NLOG_TRACE */
}
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