35 lines
1,004 B
C
35 lines
1,004 B
C
#include <growl.h>
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#include <stdlib.h>
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#include <string.h>
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void growl_arena_init(GrowlArena *arena, size_t size) {
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arena->start = arena->free = malloc(size);
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if (arena->start == NULL)
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abort();
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arena->end = arena->start + size;
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}
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void growl_arena_free(GrowlArena *arena) {
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free(arena->start);
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arena->start = arena->end = arena->free = NULL;
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}
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void *growl_arena_alloc(GrowlArena *arena, size_t size, size_t align,
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size_t count) {
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ptrdiff_t padding = -(uintptr_t)arena->free & (align - 1);
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ptrdiff_t available = arena->end - arena->free - padding;
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if (available < 0 || count > available / size) {
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fprintf(stderr, "arena: out of memory :(");
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abort();
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}
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void *p = arena->free + padding;
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arena->free += padding + count * size;
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return memset(p, 0, count * size);
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}
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char *growl_arena_strdup(GrowlArena *ar, const char *str) {
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size_t len = strlen(str) + 1;
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char *copy = growl_arena_new(ar, char, len);
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memcpy(copy, str, len);
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return copy;
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}
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