Adding mozilla libraries required by Firefox interop test.

third_party/mozprocess/tests/iniparser/dictionary.c

+/*-------------------------------------------------------------------------*/
+/**
+   @file        dictionary.c
+   @author      N. Devillard
+   @date        Sep 2007
+   @version     $Revision: 1.27 $
+   @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 1.27 2007-11-23 21:39:18 ndevilla Exp $
+        $Revision: 1.27 $
+*/
+/*---------------------------------------------------------------------------
+                                                                Includes
+ ---------------------------------------------------------------------------*/
+#include "dictionary.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+/** 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);
+    if (newptr==NULL) {
+        return NULL ;
+    }
+    memcpy(newptr, ptr, size);
+    free(ptr);
+    return newptr ;
+}
+
+/*-------------------------------------------------------------------------*/
+/**
+  @brief    Duplicate a string
+  @param    s String to duplicate
+  @return   Pointer to a newly allocated string, to be freed with free()
+
+  This is a replacement for strdup(). This implementation is provided
+  for systems that do not have it.
+ */
+/*--------------------------------------------------------------------------*/
+static char * xstrdup(char * s)
+{
+    char * t ;
+    if (!s)
+        return NULL ;
+    t = malloc(strlen(s)+1) ;
+    if (t) {
+        strcpy(t,s);
+    }
+    return t ;
+}
+
+/*---------------------------------------------------------------------------
+                                                        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[i]==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    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   int     0 if Ok, anything else otherwise
+
+  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.
+
+  This function returns non-zero in case of failure.
+ */
+/*--------------------------------------------------------------------------*/
+int dictionary_set(dictionary * d, char * key, char * val)
+{
+        int                     i ;
+        unsigned        hash ;
+
+        if (d==NULL || key==NULL) return -1 ;
+        
+        /* Compute hash for this key */
+        hash = dictionary_hash(key) ;
+        /* Find if value is already in dictionary */
+        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 ? xstrdup(val) : NULL ;
+                    /* Value has been modified: return */
+                                        return 0 ;
+                                }
+                        }
+                }
+        }
+        /* Add a new value */
+        /* See if dictionary needs to grow */
+        if (d->n==d->size) {
+
+                /* Reached maximum size: reallocate dictionary */
+                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)) ;
+        if ((d->val==NULL) || (d->key==NULL) || (d->hash==NULL)) {
+            /* Cannot grow dictionary */
+            return -1 ;
+        }
+                /* 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]  = xstrdup(key);
+    d->val[i]  = val ? xstrdup(val) : NULL ;
+        d->hash[i] = hash;
+        d->n ++ ;
+        return 0 ;
+}
+
+/*-------------------------------------------------------------------------*/
+/**
+  @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        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 ;
+}
+
+
+/* Test code */
+#ifdef TESTDIC
+#define NVALS 20000
+int main(int argc, char *argv[])
+{
+        dictionary      *       d ;
+        char    *       val ;
+        int                     i ;
+        char            cval[90] ;
+
+        /* Allocate dictionary */
+        printf("allocating...\n");
+        d = dictionary_new(0);
+        
+        /* Set values in dictionary */
+        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 */