libtar_hash_new, libtar_hash_free, libtar_hash_next, libtar_hash_prev, libtar_hash_getkey,
Contents
Description
The libtar_hash_new() function creates a new hash with num buckets and using hash function pointed to by
hashfunc. If hashfunc is NULL, a default hash function designed for 7-bit ASCII strings is used.
The libtar_hash_free() function deallocates all memory associated with the hash structure h. If freefunc
is not NULL, it is called to free memory associated with each node in the hash.
The libtar_hash_next() and libtar_hash_prev() functions are used to iterate through the hash. The
libtar_hashptr_t structure has two fields: bucket, which indicates the current bucket in the hash, and
node, which is a pointer to the current node in the current bucket. To start at the beginning or end of
the hash, the caller should initialize hp.bucket to -1 and hp.node to NULL.
The libtar_hash_search() function searches iteratively through the hash h until it finds a node whose
contents match data using the matching function matchfunc. Searching begins at the location pointed to
by hp.
The libtar_hash_getkey() function uses the hash function associated with h to determine which bucket data
should be in, and searches only that bucket for a matching node using matchfunc. Searching begins at the
location pointed to by hp.
The libtar_hash_add() function adds data into hash h.
The libtar_hash_del() function removes the node referenced by hp.
Name
libtar_hash_new, libtar_hash_free, libtar_hash_next, libtar_hash_prev, libtar_hash_getkey,
libtar_hash_search, libtar_hash_add, libtar_hash_del - hash table routines
Return Value
The libtar_hash_new() function returns a pointer to the new hash structure, or NULL on error.
The libtar_hash_next() and libtar_hash_prev() functions return 1 when valid data is returned, and 0 at
the end of the hash.
The libtar_hash_getkey() and libtar_hash_search() functions return 1 when a match is found, or 0
otherwise.
The libtar_hash_add() function returns 0 on success, or -1 on error (and sets errno).
The libtar_hash_del() function returns 0 on success, or -1 on error (and sets errno).
See Also
libtar_list_new(3) University of Illinois Jan 2000 libtar_hash_new(3)
Synopsis
#include<libtar.h>libtar_hash_t*libtar_hash_new(intnum,int(*hashfunc)());voidlibtar_hash_free(libtar_hash_t*h,void(*freefunc)());intlibtar_hash_next(libtar_hash_t*h,libtar_hashptr_t*hp);intlibtar_hash_prev(libtar_hash_t*h,libtar_hashptr_t*hp);intlibtar_hash_search(libtar_hash_t*h,libtar_hashptr_t*hp,void*data,int(*matchfunc)());intlibtar_hash_getkey(libtar_hash_t*h,libtar_hashptr_t*hp,void*data,int(*matchfunc)());intlibtar_hash_add(libtar_hash_t*h,void*data);intlibtar_hash_del(libtar_hash_t*h,libtar_hashptr_t*hp);
