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/*@@
@file StoreNamedData.c
@date Tue Sep 1 09:57:57 1998
@author Tom Goodale
@desc
Contains routines to store pointers to miscellaneous named data in
a linked list, and to search the list for a particular piece of data.
@enddesc
@version $ID$
@@*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "StoreNamedData.h"
static char *rcsid = "$Header$";
/*@@
@routine StoreNamedData
@date Tue Sep 1 09:59:09 1998
@author Tom Goodale
@desc
Stores a piece of data in a linked list.
@enddesc
@calls
@calledby
@history
@endhistory
@var list
@vdesc A pointer to the list to store the data in
@vtype pNamedData **
@vio inout
@vcomment
This should be a pointer to NULL to create a new list.
@endvar
@var name
@vdesc A string containing the name of the data item
@vtype const char *
@vio in
@vcomment
A new string is created and the data from this string is copied into it.
@endvar
@var data
@vdesc The data to store
@vtype void *
@vio in
@vcomment
This is a void pointer to any sort of data.
@endvar
@returntype int
@returndesc
This routine returns
0 on success
1 if memory allocation failed
@endreturndesc
@@*/
int StoreNamedData(pNamedData **list, const char *name, void *data)
{
int return_code;
pNamedData *new;
/* Allocate memory for the new element on the list. */
new = (pNamedData *)malloc(sizeof(pNamedData));
if(new)
{
/* Allocate memory for name field in the structure. */
new->name = malloc((strlen(name)+1)*sizeof(char));
if(new->name)
{
/* Copy the name. */
strcpy(new->name, name);
/* Store the data. */
new->data = data;
/* Link it into the list. */
new->next = (*list);
new->last = NULL;
if(new->next) new->next->last = new;
(*list) = new;
return_code = 0;
}
else
{
free(new);
return_code = 1;
};
}
else
{
return_code = 1;
};
return return_code;
}
/*@@
@routine GetNamedData
@date Tue Sep 1 10:11:10 1998
@author Tom Goodale
@desc
Searches a list of named data items and returns the appropriate data.
@enddesc
@calls
@calledby
@history
@endhistory
@var list
@vdesc The list to store the data in
@vtype pNamedData *
@vio in
@vcomment
If this is a pointer to NULL, the routine returns immediately.
@endvar
@var name
@vdesc A string containing the name of the data item
@vtype const char *
@vio in
@vcomment
The routine searches for an exact match, case dependent.
@endvar
@returntype void *
@returndesc
This routine returns
a pointer to the data on success
NULL if the list is NULL or the name was not found.
@endreturndesc
@@*/
void *GetNamedData(pNamedData *list, const char *name)
{
void *return_val;
pNamedData *current;
return_val = NULL;
if(list)
{
/* Traverse the list */
for(current = list; current ; current = current->next)
{
/* Compare the name */
if(!strcmp(current->name, name))
{
return_val = current->data;
break;
};
};
};
return return_val;
}
/*@@
@routine DestroyNamedDataList
@date Tue Sep 1 10:40:49 1998
@author Tom Goodale
@desc
Frees the memory allocated to a a list of named data items.
@enddesc
@calls
@calledby
@history
@endhistory
@var list
@vdesc The list to destroy.
@vtype pNamedData *
@vio in
@vcomment
If this is a pointer to NULL, the routine returns immediately.
@endvar
@@*/
void DestroyNamedDataList(pNamedData *list)
{
pNamedData *current;
pNamedData *next;
/* Traverse the list freeing memory. */
for(current = list; current; current = next)
{
next = current->next;
free(current);
};
}
/*#define TEST_StoreNamedData*/
#ifdef TEST_StoreNamedData
/* Test routine to allow the above code to be tested independently of
* other code.
*/
static char first_name[] = "First Item";
static char first_data[] = "First Data";
static char second_name[] = "Second Item";
static char second_data[] = "Second Data";
static char third_name[] = "Third Item";
static char third_data[] = "Third Data";
#define DETECT_ERROR(error) if(error) {printf("Error on line %d\n", __LINE__); exit(1);}
int main(void)
{
pNamedData *list;
char *data;
list = NULL;
/* Test creation of the list. */
DETECT_ERROR(StoreNamedData(&list, first_name, first_data));
DETECT_ERROR(StoreNamedData(&list, second_name, second_data));
DETECT_ERROR(StoreNamedData(&list, third_name, third_data));
/* Test accessing the data. */
if((data = GetNamedData(list, first_name)))
{
printf("Name %s has data %s\n", first_name, data);
};
if((data = GetNamedData(list, second_name)))
{
printf("Name %s has data %s\n", second_name, data);
};
if((data = GetNamedData(list, third_name)))
{
printf("Name %s has data %s\n", third_name, data);
};
/* test destroying the list. */
DestroyNamedDataList(list);
list = NULL;
return 0;
}
#endif
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