project_files/frontlib/iniparser/dictionary.c
author Wuzzy <almikes@aol.com>
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/*-------------------------------------------------------------------------*/
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/**
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   @file    dictionary.c
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   @author  N. Devillard
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   @brief   Implements a dictionary for string variables.
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   This module implements a simple dictionary object, i.e. a list
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   of string/string associations. This object is useful to store e.g.
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   informations retrieved from a configuration file (ini files).
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*/
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/*--------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------
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                                Includes
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 ---------------------------------------------------------------------------*/
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#include "dictionary.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/** Maximum value size for integers and doubles. */
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#define MAXVALSZ    1024
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/** Minimal allocated number of entries in a dictionary */
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#define DICTMINSZ   128
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/** Invalid key token */
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#define DICT_INVALID_KEY    ((char*)-1)
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/*---------------------------------------------------------------------------
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                            Private functions
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 ---------------------------------------------------------------------------*/
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/* Doubles the allocated size associated to a pointer */
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/* 'size' is the current allocated size. */
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static void * mem_double(void * ptr, int size)
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{
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    void * newptr ;
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    newptr = calloc(2*size, 1);
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    if (newptr==NULL) {
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        return NULL ;
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    }
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    memcpy(newptr, ptr, size);
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    free(ptr);
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    return newptr ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Duplicate a string
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  @param    s String to duplicate
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  @return   Pointer to a newly allocated string, to be freed with free()
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  This is a replacement for strdup(). This implementation is provided
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  for systems that do not have it.
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 */
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/*--------------------------------------------------------------------------*/
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static char * xstrdup(const char * s)
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{
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    char * t ;
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    if (!s)
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        return NULL ;
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    t = (char*)malloc(strlen(s)+1) ;
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    if (t) {
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        strcpy(t,s);
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    }
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    return t ;
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}
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/*---------------------------------------------------------------------------
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                            Function codes
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 ---------------------------------------------------------------------------*/
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Compute the hash key for a string.
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  @param    key     Character string to use for key.
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  @return   1 unsigned int on at least 32 bits.
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  This hash function has been taken from an Article in Dr Dobbs Journal.
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  This is normally a collision-free function, distributing keys evenly.
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  The key is stored anyway in the struct so that collision can be avoided
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  by comparing the key itself in last resort.
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 */
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/*--------------------------------------------------------------------------*/
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unsigned dictionary_hash(const char * key)
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{
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    int         len ;
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    unsigned    hash ;
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    int         i ;
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    len = strlen(key);
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    for (hash=0, i=0 ; i<len ; i++) {
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        hash += (unsigned)key[i] ;
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        hash += (hash<<10);
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        hash ^= (hash>>6) ;
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    }
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    hash += (hash <<3);
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    hash ^= (hash >>11);
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    hash += (hash <<15);
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    return hash ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Create a new dictionary object.
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  @param    size    Optional initial size of the dictionary.
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  @return   1 newly allocated dictionary objet.
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  This function allocates a new dictionary object of given size and returns
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  it. If you do not know in advance (roughly) the number of entries in the
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  dictionary, give size=0.
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 */
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/*--------------------------------------------------------------------------*/
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dictionary * dictionary_new(int size)
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{
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    dictionary  *   d ;
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    /* If no size was specified, allocate space for DICTMINSZ */
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    if (size<DICTMINSZ) size=DICTMINSZ ;
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    if (!(d = (dictionary *)calloc(1, sizeof(dictionary)))) {
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        return NULL;
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    }
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    d->size = size ;
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    d->val  = (char **)calloc(size, sizeof(char*));
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    d->key  = (char **)calloc(size, sizeof(char*));
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    d->hash = (unsigned int *)calloc(size, sizeof(unsigned));
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    return d ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Delete a dictionary object
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  @param    d   dictionary object to deallocate.
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  @return   void
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  Deallocate a dictionary object and all memory associated to it.
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 */
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/*--------------------------------------------------------------------------*/
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void dictionary_del(dictionary * d)
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{
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    int     i ;
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    if (d==NULL) return ;
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    for (i=0 ; i<d->size ; i++) {
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        if (d->key[i]!=NULL)
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            free(d->key[i]);
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        if (d->val[i]!=NULL)
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            free(d->val[i]);
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    }
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    free(d->val);
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    free(d->key);
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    free(d->hash);
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    free(d);
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    return ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Get a value from a dictionary.
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  @param    d       dictionary object to search.
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  @param    key     Key to look for in the dictionary.
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  @param    def     Default value to return if key not found.
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  @return   1 pointer to internally allocated character string.
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  This function locates a key in a dictionary and returns a pointer to its
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  value, or the passed 'def' pointer if no such key can be found in
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  dictionary. The returned character pointer points to data internal to the
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  dictionary object, you should not try to free it or modify it.
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 */
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/*--------------------------------------------------------------------------*/
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char * dictionary_get(dictionary * d, const char * key, char * def)
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{
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    unsigned    hash ;
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    int         i ;
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    hash = dictionary_hash(key);
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    for (i=0 ; i<d->size ; i++) {
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        if (d->key[i]==NULL)
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            continue ;
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        /* Compare hash */
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        if (hash==d->hash[i]) {
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            /* Compare string, to avoid hash collisions */
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            if (!strcmp(key, d->key[i])) {
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                return d->val[i] ;
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            }
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        }
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    }
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    return def ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Set a value in a dictionary.
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  @param    d       dictionary object to modify.
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  @param    key     Key to modify or add.
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  @param    val     Value to add.
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  @return   int     0 if Ok, anything else otherwise
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  If the given key is found in the dictionary, the associated value is
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  replaced by the provided one. If the key cannot be found in the
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  dictionary, it is added to it.
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  It is Ok to provide a NULL value for val, but NULL values for the dictionary
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  or the key are considered as errors: the function will return immediately
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  in such a case.
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  Notice that if you dictionary_set a variable to NULL, a call to
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  dictionary_get will return a NULL value: the variable will be found, and
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  its value (NULL) is returned. In other words, setting the variable
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  content to NULL is equivalent to deleting the variable from the
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  dictionary. It is not possible (in this implementation) to have a key in
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  the dictionary without value.
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  This function returns non-zero in case of failure.
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 */
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/*--------------------------------------------------------------------------*/
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int dictionary_set(dictionary * d, const char * key, const char * val)
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{
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    int         i ;
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    unsigned    hash ;
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    if (d==NULL || key==NULL) return -1 ;
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7175
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    /* Compute hash for this key */
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    hash = dictionary_hash(key) ;
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    /* Find if value is already in dictionary */
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    if (d->n>0) {
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        for (i=0 ; i<d->size ; i++) {
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            if (d->key[i]==NULL)
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                continue ;
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            if (hash==d->hash[i]) { /* Same hash value */
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                if (!strcmp(key, d->key[i])) {   /* Same key */
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                    /* Found a value: modify and return */
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                    if (d->val[i]!=NULL)
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                        free(d->val[i]);
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                    d->val[i] = val ? xstrdup(val) : NULL ;
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                    /* Value has been modified: return */
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                    return 0 ;
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                }
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            }
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        }
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    }
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    /* Add a new value */
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    /* See if dictionary needs to grow */
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    if (d->n==d->size) {
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        /* Reached maximum size: reallocate dictionary */
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        d->val  = (char **)mem_double(d->val,  d->size * sizeof(char*)) ;
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        d->key  = (char **)mem_double(d->key,  d->size * sizeof(char*)) ;
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        d->hash = (unsigned int *)mem_double(d->hash, d->size * sizeof(unsigned)) ;
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        if ((d->val==NULL) || (d->key==NULL) || (d->hash==NULL)) {
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            /* Cannot grow dictionary */
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            return -1 ;
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        }
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        /* Double size */
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        d->size *= 2 ;
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    }
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    /* Insert key in the first empty slot. Start at d->n and wrap at
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       d->size. Because d->n < d->size this will necessarily
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       terminate. */
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    for (i=d->n ; d->key[i] ; ) {
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        if(++i == d->size) i = 0;
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    }
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    /* Copy key */
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    d->key[i]  = xstrdup(key);
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    d->val[i]  = val ? xstrdup(val) : NULL ;
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    d->hash[i] = hash;
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    d->n ++ ;
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    return 0 ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Delete a key in a dictionary
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  @param    d       dictionary object to modify.
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  @param    key     Key to remove.
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  @return   void
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  This function deletes a key in a dictionary. Nothing is done if the
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  key cannot be found.
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 */
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/*--------------------------------------------------------------------------*/
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void dictionary_unset(dictionary * d, const char * key)
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{
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    unsigned    hash ;
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    int         i ;
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    if (key == NULL) {
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        return;
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    }
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    hash = dictionary_hash(key);
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    for (i=0 ; i<d->size ; i++) {
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        if (d->key[i]==NULL)
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            continue ;
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        /* Compare hash */
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        if (hash==d->hash[i]) {
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            /* Compare string, to avoid hash collisions */
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            if (!strcmp(key, d->key[i])) {
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                /* Found key */
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                break ;
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            }
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        }
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    }
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    if (i>=d->size)
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        /* Key not found */
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        return ;
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    free(d->key[i]);
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    d->key[i] = NULL ;
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    if (d->val[i]!=NULL) {
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        free(d->val[i]);
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        d->val[i] = NULL ;
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    }
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    d->hash[i] = 0 ;
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    d->n -- ;
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    return ;
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}
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Dump a dictionary to an opened file pointer.
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  @param    d   Dictionary to dump
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  @param    f   Opened file pointer.
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  @return   void
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  Dumps a dictionary onto an opened file pointer. Key pairs are printed out
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  as @c [Key]=[Value], one per line. It is Ok to provide stdout or stderr as
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  output file pointers.
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 */
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/*--------------------------------------------------------------------------*/
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void dictionary_dump(dictionary * d, FILE * out)
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{
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    int     i ;
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    if (d==NULL || out==NULL) return ;
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    if (d->n<1) {
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        fprintf(out, "empty dictionary\n");
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        return ;
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    }
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    for (i=0 ; i<d->size ; i++) {
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        if (d->key[i]) {
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            fprintf(out, "%20s\t[%s]\n",
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                    d->key[i],
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                    d->val[i] ? d->val[i] : "UNDEF");
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        }
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    }
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   353
    return ;
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   354
}
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/* Test code */
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#ifdef TESTDIC
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#define NVALS 20000
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int main(int argc, char *argv[])
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{
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   362
    dictionary  *   d ;
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   363
    char    *   val ;
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   364
    int         i ;
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   365
    char        cval[90] ;
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   366
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   367
    /* Allocate dictionary */
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   368
    printf("allocating...\n");
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   369
    d = dictionary_new(0);
10017
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   370
7175
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   371
    /* Set values in dictionary */
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   372
    printf("setting %d values...\n", NVALS);
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   373
    for (i=0 ; i<NVALS ; i++) {
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   374
        sprintf(cval, "%04d", i);
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   375
        dictionary_set(d, cval, "salut");
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   376
    }
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   377
    printf("getting %d values...\n", NVALS);
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   378
    for (i=0 ; i<NVALS ; i++) {
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   379
        sprintf(cval, "%04d", i);
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   380
        val = dictionary_get(d, cval, DICT_INVALID_KEY);
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   381
        if (val==DICT_INVALID_KEY) {
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   382
            printf("cannot get value for key [%s]\n", cval);
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   383
        }
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   384
    }
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   385
    printf("unsetting %d values...\n", NVALS);
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   386
    for (i=0 ; i<NVALS ; i++) {
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   387
        sprintf(cval, "%04d", i);
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   388
        dictionary_unset(d, cval);
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diff changeset
   389
    }
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diff changeset
   390
    if (d->n != 0) {
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diff changeset
   391
        printf("error deleting values\n");
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diff changeset
   392
    }
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diff changeset
   393
    printf("deallocating...\n");
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diff changeset
   394
    dictionary_del(d);
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diff changeset
   395
    return 0 ;
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   396
}
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   397
#endif
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/* vim: set ts=4 et sw=4 tw=75 */