85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
#ifndef HSHTB_H_
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#define HSHTB_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "hal/hal.h"
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#include "util/util.h"
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#define HSHTB_FNV32_OFF 0x811c9dc5u
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#define HSHTB_FNV32_PRIME 0x01000193u
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static inline uint32_t hshtb_fnv32(const void *data, size_t len) {
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const unsigned char *p = (const unsigned char *)data;
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uint32_t h = HSHTB_FNV32_OFF;
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for (size_t i = 0; i < len; i++) {
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h ^= p[i];
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h *= HSHTB_FNV32_PRIME;
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}
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return h;
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}
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enum {
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HSHTB_EMPTY = 0,
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HSHTB_TAKEN = 1,
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HSHTB_TOMB = 2,
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};
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#define HSHTB_ALLOC(tb, keyfield, k, out) \
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do { \
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size_t __len = sizeof((tb)) / sizeof((tb)[0]); \
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uint32_t __h = hshtb_fnv32((k), strlen((k))); \
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size_t __idx = __h % __len; \
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size_t __start = __idx; \
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typeof(&(tb)[0]) __tomb = NULL; \
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do { \
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if ((tb)[__idx]._hshtbstate == HSHTB_EMPTY) { \
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typeof(&(tb)[0]) __slot = __tomb ? __tomb : &(tb)[__idx]; \
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hal_memset(__slot, 0, sizeof(*__slot)); \
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__slot->_hshtbstate = HSHTB_TAKEN; \
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hal_memcpy(__slot->keyfield, (k), MIN(sizeof(__slot->keyfield) - 1, hal_strlen((k)))); \
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(out) = __slot; \
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break; \
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} \
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if ((tb)[__idx]._hshtbstate == HSHTB_TAKEN && hal_strcmp((tb)[__idx].keyfield, (k)) == 0) { \
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(out) = &(tb)[__idx]; \
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break; \
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} \
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if ((tb)[__idx]._hshtbstate == HSHTB_TOMB && !__tomb) { \
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__tomb = &(tb)[__idx]; \
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} \
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__idx = (__idx + 1) % __len; \
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} while(__idx != __start); \
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} while(0)
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#define HSHTB_GET(tb, keyfield, k, out) \
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do { \
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size_t __len = sizeof((tb)) / sizeof((tb)[0]); \
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uint32_t __h = hshtb_fnv32((k), hal_strlen((k))); \
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size_t __idx = __h % __len; \
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size_t __start = __idx; \
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(out) = NULL; \
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do { \
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if ((tb)[__idx]._hshtbstate == HSHTB_EMPTY) { \
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break; \
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} \
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if ((tb)[__idx]._hshtbstate == HSHTB_TAKEN && hal_strcmp((tb)[__idx].keyfield, (k)) == 0) { \
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(out) = &(tb)[__idx]; \
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break; \
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} \
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__idx = (__idx + 1) % __len; \
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} while(__idx != __start); \
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} while(0)
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#define HSHTB_DELETE(tb, keyfield, k) \
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do { \
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typeof(&(tb)[0]) __e; \
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HSHTB_GET((tb), (keyfield), (k), __e); \
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if (__e) { \
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__e->state = HSHTB_TOMB; \
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} \
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} while(0)
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#endif // HSHTB_H_
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