wehub-resource-sync
42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
#ifndef CBM_ARENA_H
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#define CBM_ARENA_H
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#include <stddef.h>
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// CBMArena is a simple bump allocator that allocates from fixed-size blocks.
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// All memory is freed at once via cbm_arena_destroy(). Individual frees are not
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// supported — this is by design for per-file extraction where all data has the
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// same lifetime.
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#define CBM_ARENA_MAX_BLOCKS 256
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#define CBM_ARENA_DEFAULT_BLOCK_SIZE (64 * 1024) // 64KB initial
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typedef struct {
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char *blocks[CBM_ARENA_MAX_BLOCKS];
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size_t block_sizes[CBM_ARENA_MAX_BLOCKS]; // per-block sizes (for stats)
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int nblocks;
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size_t block_size;
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size_t used; // bytes used in current block
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size_t total_alloc; // cumulative bytes allocated (for stats)
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} CBMArena;
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// Initialize an arena with the default block size.
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void cbm_arena_init(CBMArena *a);
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// Allocate n bytes from the arena. Returns NULL on OOM or block exhaustion.
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// All returned pointers are 8-byte aligned.
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void *cbm_arena_alloc(CBMArena *a, size_t n);
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// Duplicate a string into arena memory. Returns arena-owned copy.
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char *cbm_arena_strdup(CBMArena *a, const char *s);
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// Duplicate a string of known length into arena memory. NUL-terminates.
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char *cbm_arena_strndup(CBMArena *a, const char *s, size_t len);
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// sprintf into arena memory. Returns arena-owned string.
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char *cbm_arena_sprintf(CBMArena *a, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
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// Free all blocks. Arena is invalid after this call.
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void cbm_arena_destroy(CBMArena *a);
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#endif // CBM_ARENA_H
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