project_files/frontlib/iniparser/dictionary.h
author Wuzzy <almikes@aol.com>
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/*-------------------------------------------------------------------------*/
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/**
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   @file    dictionary.h
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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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#ifndef _DICTIONARY_H_
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#define _DICTIONARY_H_
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/*---------------------------------------------------------------------------
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                                Includes
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 ---------------------------------------------------------------------------*/
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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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/*---------------------------------------------------------------------------
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                                New types
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 ---------------------------------------------------------------------------*/
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/*-------------------------------------------------------------------------*/
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/**
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  @brief    Dictionary object
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  This object contains a list of string/string associations. Each
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  association is identified by a unique string key. Looking up values
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  in the dictionary is speeded up by the use of a (hopefully collision-free)
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  hash function.
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 */
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/*-------------------------------------------------------------------------*/
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typedef struct _dictionary_ {
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    int             n ;     /** Number of entries in dictionary */
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    int             size ;  /** Storage size */
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    char        **  val ;   /** List of string values */
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    char        **  key ;   /** List of string keys */
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    unsigned     *  hash ;  /** List of hash values for keys */
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} dictionary ;
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/*---------------------------------------------------------------------------
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                            Function prototypes
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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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/**
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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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/**
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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 * vd);
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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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/**
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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 * vd, const char * key, const char * val);
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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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/**
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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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#endif