diff options
Diffstat (limited to 'src/hashtable.c')
| -rw-r--r-- | src/hashtable.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/hashtable.c b/src/hashtable.c index 763357e..ac29af3 100644 --- a/src/hashtable.c +++ b/src/hashtable.c @@ -5,7 +5,6 @@ #include <stdlib.h> #include <stdio.h> #include <string.h> -#include <math.h> /* Credit for primes table: Aaron Krowne @@ -24,6 +23,25 @@ static const unsigned int primes[] = { const unsigned int prime_table_length = sizeof(primes)/sizeof(primes[0]); const float max_load_factor = 0.65; +#define TOL 1e-6 // float tolerance + +/** + * my_ceil - calculate ceil value + * Using C ceil() from math.h with -lm requires to link this library only for + * this simple function. As it is not performance relevent for the hash table + * we use our own * implementation. + * + */ +static int my_ceil(float x) +{ + int y = (int) x; + if (y - x > TOL) + return y; + else + return y + 1; +} + + /*****************************************************************************/ struct hashtable * create_hashtable(unsigned int minsize, @@ -48,7 +66,7 @@ create_hashtable(unsigned int minsize, h->entrycount = 0; h->hashfn = hashf; h->eqfn = eqf; - h->loadlimit = (unsigned int) ceil(size * max_load_factor); + h->loadlimit = my_ceil(size * max_load_factor); return h; } @@ -121,7 +139,7 @@ hashtable_expand(struct hashtable *h) } } h->tablelength = newsize; - h->loadlimit = (unsigned int) ceil(newsize * max_load_factor); + h->loadlimit = my_ceil(newsize * max_load_factor); return -1; } |