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+
+/*-------------------------------------------------------------------------*/
+/**
+ @file dictionary.c
+ @author N. Devillard
+ @date Aug 2000
+ @version $Revision: 1.25 $
+ @brief Implements a dictionary for string variables.
+
+ This module implements a simple dictionary object, i.e. a list
+ of string/string associations. This object is useful to store e.g.
+ informations retrieved from a configuration file (ini files).
+*/
+/*--------------------------------------------------------------------------*/
+
+/*
+ $Id: dictionary.c,v 1.25 2007-05-27 13:03:43 ndevilla Exp $
+ $Author: ndevilla $
+ $Date: 2007-05-27 13:03:43 $
+ $Revision: 1.25 $
+*/
+
+/*---------------------------------------------------------------------------
+ Includes
+ ---------------------------------------------------------------------------*/
+
+#include "dictionary.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+/** Maximum value size for integers and doubles. */
+#define MAXVALSZ 1024
+
+/** Minimal allocated number of entries in a dictionary */
+#define DICTMINSZ 128
+
+/** Invalid key token */
+#define DICT_INVALID_KEY ((char*)-1)
+
+
+/*---------------------------------------------------------------------------
+ Private functions
+ ---------------------------------------------------------------------------*/
+
+/* Doubles the allocated size associated to a pointer */
+/* 'size' is the current allocated size. */
+static void * mem_double(void * ptr, int size)
+{
+ void * newptr ;
+
+ newptr = calloc(2*size, 1);
+ memcpy(newptr, ptr, size);
+ free(ptr);
+ return newptr ;
+}
+
+
+/*---------------------------------------------------------------------------
+ Function codes
+ ---------------------------------------------------------------------------*/
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Compute the hash key for a string.
+ @param key Character string to use for key.
+ @return 1 unsigned int on at least 32 bits.
+
+ This hash function has been taken from an Article in Dr Dobbs Journal.
+ This is normally a collision-free function, distributing keys evenly.
+ The key is stored anyway in the struct so that collision can be avoided
+ by comparing the key itself in last resort.
+ */
+/*--------------------------------------------------------------------------*/
+
+unsigned dictionary_hash(char * key)
+{
+ int len ;
+ unsigned hash ;
+ int i ;
+
+ len = strlen(key);
+ for (hash=0, i=0 ; i<len ; i++) {
+ hash += (unsigned)key[i] ;
+ hash += (hash<<10);
+ hash ^= (hash>>6) ;
+ }
+ hash += (hash <<3);
+ hash ^= (hash >>11);
+ hash += (hash <<15);
+ return hash ;
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Create a new dictionary object.
+ @param size Optional initial size of the dictionary.
+ @return 1 newly allocated dictionary objet.
+
+ This function allocates a new dictionary object of given size and returns
+ it. If you do not know in advance (roughly) the number of entries in the
+ dictionary, give size=0.
+ */
+/*--------------------------------------------------------------------------*/
+
+dictionary * dictionary_new(int size)
+{
+ dictionary * d ;
+
+ /* If no size was specified, allocate space for DICTMINSZ */
+ if (size<DICTMINSZ) size=DICTMINSZ ;
+
+ if (!(d = (dictionary *)calloc(1, sizeof(dictionary)))) {
+ return NULL;
+ }
+ d->size = size ;
+ d->val = (char **)calloc(size, sizeof(char*));
+ d->key = (char **)calloc(size, sizeof(char*));
+ d->hash = (unsigned int *)calloc(size, sizeof(unsigned));
+ return d ;
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Delete a dictionary object
+ @param d dictionary object to deallocate.
+ @return void
+
+ Deallocate a dictionary object and all memory associated to it.
+ */
+/*--------------------------------------------------------------------------*/
+
+void dictionary_del(dictionary * d)
+{
+ int i ;
+
+ if (d==NULL) return ;
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key[i]!=NULL)
+ free(d->key[i]);
+ if (d->val[i]!=NULL)
+ free(d->val[i]);
+ }
+ free(d->val);
+ free(d->key);
+ free(d->hash);
+ free(d);
+ return ;
+}
+
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Get a value from a dictionary.
+ @param d dictionary object to search.
+ @param key Key to look for in the dictionary.
+ @param def Default value to return if key not found.
+ @return 1 pointer to internally allocated character string.
+
+ This function locates a key in a dictionary and returns a pointer to its
+ value, or the passed 'def' pointer if no such key can be found in
+ dictionary. The returned character pointer points to data internal to the
+ dictionary object, you should not try to free it or modify it.
+ */
+/*--------------------------------------------------------------------------*/
+char * dictionary_get(dictionary * d, char * key, char * def)
+{
+ unsigned hash ;
+ int i ;
+
+ hash = dictionary_hash(key);
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key==NULL)
+ continue ;
+ /* Compare hash */
+ if (hash==d->hash[i]) {
+ /* Compare string, to avoid hash collisions */
+ if (!strcmp(key, d->key[i])) {
+ return d->val[i] ;
+ }
+ }
+ }
+ return def ;
+}
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Get a value from a dictionary, as a char.
+ @param d dictionary object to search.
+ @param key Key to look for in the dictionary.
+ @param def Default value for the key if not found.
+ @return char
+
+ This function locates a key in a dictionary using dictionary_get,
+ and returns the first char of the found string.
+ */
+/*--------------------------------------------------------------------------*/
+char dictionary_getchar(dictionary * d, char * key, char def)
+{
+ char * v ;
+
+ if ((v=dictionary_get(d,key,DICT_INVALID_KEY))==DICT_INVALID_KEY) {
+ return def ;
+ } else {
+ return v[0] ;
+ }
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Get a value from a dictionary, as an int.
+ @param d dictionary object to search.
+ @param key Key to look for in the dictionary.
+ @param def Default value for the key if not found.
+ @return int
+
+ This function locates a key in a dictionary using dictionary_get,
+ and applies atoi on it to return an int. If the value cannot be found
+ in the dictionary, the default is returned.
+ */
+/*--------------------------------------------------------------------------*/
+int dictionary_getint(dictionary * d, char * key, int def)
+{
+ char * v ;
+
+ if ((v=dictionary_get(d,key,DICT_INVALID_KEY))==DICT_INVALID_KEY) {
+ return def ;
+ } else {
+ return atoi(v);
+ }
+}
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Get a value from a dictionary, as a double.
+ @param d dictionary object to search.
+ @param key Key to look for in the dictionary.
+ @param def Default value for the key if not found.
+ @return double
+
+ This function locates a key in a dictionary using dictionary_get,
+ and applies atof on it to return a double. If the value cannot be found
+ in the dictionary, the default is returned.
+ */
+/*--------------------------------------------------------------------------*/
+double dictionary_getdouble(dictionary * d, char * key, double def)
+{
+ char * v ;
+
+ if ((v=dictionary_get(d,key,DICT_INVALID_KEY))==DICT_INVALID_KEY) {
+ return def ;
+ } else {
+ return atof(v);
+ }
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Set a value in a dictionary.
+ @param d dictionary object to modify.
+ @param key Key to modify or add.
+ @param val Value to add.
+ @return void
+
+ If the given key is found in the dictionary, the associated value is
+ replaced by the provided one. If the key cannot be found in the
+ dictionary, it is added to it.
+
+ It is Ok to provide a NULL value for val, but NULL values for the dictionary
+ or the key are considered as errors: the function will return immediately
+ in such a case.
+
+ Notice that if you dictionary_set a variable to NULL, a call to
+ dictionary_get will return a NULL value: the variable will be found, and
+ its value (NULL) is returned. In other words, setting the variable
+ content to NULL is equivalent to deleting the variable from the
+ dictionary. It is not possible (in this implementation) to have a key in
+ the dictionary without value.
+ */
+/*--------------------------------------------------------------------------*/
+
+void dictionary_set(dictionary * d, char * key, char * val)
+{
+ int i ;
+ unsigned hash ;
+
+ if (d==NULL || key==NULL) return ;
+
+ /* Compute hash for this key */
+ hash = dictionary_hash(key) ;
+ /* Find if value is already in blackboard */
+ if (d->n>0) {
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key[i]==NULL)
+ continue ;
+ if (hash==d->hash[i]) { /* Same hash value */
+ if (!strcmp(key, d->key[i])) { /* Same key */
+ /* Found a value: modify and return */
+ if (d->val[i]!=NULL)
+ free(d->val[i]);
+ d->val[i] = val ? strdup(val) : NULL ;
+ /* Value has been modified: return */
+ return ;
+ }
+ }
+ }
+ }
+ /* Add a new value */
+ /* See if dictionary needs to grow */
+ if (d->n==d->size) {
+
+ /* Reached maximum size: reallocate blackboard */
+ d->val = (char **)mem_double(d->val, d->size * sizeof(char*)) ;
+ d->key = (char **)mem_double(d->key, d->size * sizeof(char*)) ;
+ d->hash = (unsigned int *)mem_double(d->hash, d->size * sizeof(unsigned)) ;
+
+ /* Double size */
+ d->size *= 2 ;
+ }
+
+ /* Insert key in the first empty slot */
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key[i]==NULL) {
+ /* Add key here */
+ break ;
+ }
+ }
+ /* Copy key */
+ d->key[i] = strdup(key);
+ d->val[i] = val ? strdup(val) : NULL ;
+ d->hash[i] = hash;
+ d->n ++ ;
+ return ;
+}
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Delete a key in a dictionary
+ @param d dictionary object to modify.
+ @param key Key to remove.
+ @return void
+
+ This function deletes a key in a dictionary. Nothing is done if the
+ key cannot be found.
+ */
+/*--------------------------------------------------------------------------*/
+void dictionary_unset(dictionary * d, char * key)
+{
+ unsigned hash ;
+ int i ;
+
+ if (key == NULL) {
+ return;
+ }
+
+ hash = dictionary_hash(key);
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key[i]==NULL)
+ continue ;
+ /* Compare hash */
+ if (hash==d->hash[i]) {
+ /* Compare string, to avoid hash collisions */
+ if (!strcmp(key, d->key[i])) {
+ /* Found key */
+ break ;
+ }
+ }
+ }
+ if (i>=d->size)
+ /* Key not found */
+ return ;
+
+ free(d->key[i]);
+ d->key[i] = NULL ;
+ if (d->val[i]!=NULL) {
+ free(d->val[i]);
+ d->val[i] = NULL ;
+ }
+ d->hash[i] = 0 ;
+ d->n -- ;
+ return ;
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Set a key in a dictionary, providing an int.
+ @param d Dictionary to update.
+ @param key Key to modify or add
+ @param val Integer value to store (will be stored as a string).
+ @return void
+
+ This helper function calls dictionary_set() with the provided integer
+ converted to a string using %d.
+ */
+/*--------------------------------------------------------------------------*/
+
+
+void dictionary_setint(dictionary * d, char * key, int val)
+{
+ char sval[MAXVALSZ];
+ sprintf(sval, "%d", val);
+ dictionary_set(d, key, sval);
+}
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Set a key in a dictionary, providing a double.
+ @param d Dictionary to update.
+ @param key Key to modify or add
+ @param val Double value to store (will be stored as a string).
+ @return void
+
+ This helper function calls dictionary_set() with the provided double
+ converted to a string using %g.
+ */
+/*--------------------------------------------------------------------------*/
+
+
+void dictionary_setdouble(dictionary * d, char * key, double val)
+{
+ char sval[MAXVALSZ];
+ sprintf(sval, "%g", val);
+ dictionary_set(d, key, sval);
+}
+
+
+
+/*-------------------------------------------------------------------------*/
+/**
+ @brief Dump a dictionary to an opened file pointer.
+ @param d Dictionary to dump
+ @param f Opened file pointer.
+ @return void
+
+ Dumps a dictionary onto an opened file pointer. Key pairs are printed out
+ as @c [Key]=[Value], one per line. It is Ok to provide stdout or stderr as
+ output file pointers.
+ */
+/*--------------------------------------------------------------------------*/
+
+void dictionary_dump(dictionary * d, FILE * out)
+{
+ int i ;
+
+ if (d==NULL || out==NULL) return ;
+ if (d->n<1) {
+ fprintf(out, "empty dictionary\n");
+ return ;
+ }
+ for (i=0 ; i<d->size ; i++) {
+ if (d->key[i]) {
+ fprintf(out, "%20s\t[%s]\n",
+ d->key[i],
+ d->val[i] ? d->val[i] : "UNDEF");
+ }
+ }
+ return ;
+}
+
+
+
+/* Example code */
+#ifdef TESTDIC
+#define NVALS 20000
+int main(int argc, char *argv[])
+{
+ dictionary * d ;
+ char * val ;
+ int i ;
+ char cval[90] ;
+
+ /* allocate blackboard */
+ printf("allocating...\n");
+ d = dictionary_new(0);
+
+ /* Set values in blackboard */
+ printf("setting %d values...\n", NVALS);
+ for (i=0 ; i<NVALS ; i++) {
+ sprintf(cval, "%04d", i);
+ dictionary_set(d, cval, "salut");
+ }
+ printf("getting %d values...\n", NVALS);
+ for (i=0 ; i<NVALS ; i++) {
+ sprintf(cval, "%04d", i);
+ val = dictionary_get(d, cval, DICT_INVALID_KEY);
+ if (val==DICT_INVALID_KEY) {
+ printf("cannot get value for key [%s]\n", cval);
+ }
+ }
+ printf("unsetting %d values...\n", NVALS);
+ for (i=0 ; i<NVALS ; i++) {
+ sprintf(cval, "%04d", i);
+ dictionary_unset(d, cval);
+ }
+ if (d->n != 0) {
+ printf("error deleting values\n");
+ }
+
+ printf("deallocating...\n");
+ dictionary_del(d);
+ return 0 ;
+}
+#endif
+/* vim: set ts=4 et sw=4 tw=75 */
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