mirror of https://github.com/TheAlgorithms/C
51 lines
1015 B
C
51 lines
1015 B
C
/**
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* @addtogroup hash Hash algorithms
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* @{
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* @file hash_sdbm.c
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* @author [Christian Bender](https://github.com/christianbender)
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* @brief [SDBM hash algorithm](http://www.cse.yorku.ca/~oz/hash.html)
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*/
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#include <assert.h>
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#include <inttypes.h>
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#include <stdio.h>
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/**
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* @brief SDBM algorithm implementation
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*
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* @param s NULL terminated string to hash
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* @return 64-bit hash result
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*/
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uint64_t sdbm(const char* s)
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{
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uint64_t hash = 0;
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size_t i = 0;
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while (s[i] != '\0')
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{
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hash = s[i] + (hash << 6) + (hash << 16) - hash;
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i++;
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}
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return hash;
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}
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/**
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* @brief Test function for ::sdbm
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* \returns None
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*/
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void test_sdbm()
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{
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assert(sdbm("Hello World") == 12881824461405877380U);
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assert(sdbm("Hello World!") == 7903571203300273309);
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assert(sdbm("Hello world") == 15154913742888948900U);
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assert(sdbm("Hello world!") == 15254999417003201661U);
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printf("Tests passed\n");
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}
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/** @} */
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/** Main function */
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int main()
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{
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test_sdbm();
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return 0;
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}
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