hash.c

UNIX编程高级环境（第二版）的网络套接字部分的程序源码

#include    "db.h"

/* Calculate the hash value for a key. */

hash_t
_db_hash(DB *db, const char *key)
{
    hash_t        hval;
    const char    *ptr;
    char        c;
    int            i;

    hval = 0;
    for (ptr = key, i = 1; c = *ptr++; i++)
        hval += c * i;        /* ascii char times its 1-based index */

    return(hval % db->nhash);
}