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/* $Header: /home/ksheff/src/e2tools/RCS/elist.c,v 0.6 2004/04/06 19:34:44 ksheff Exp $ */
/*
* elist.c
*
* Copyright (C) 2002 Keith W Sheffield. This file may be redistributed
* under the terms of the GNU Public License.
*
*/
#ifndef ELIST_C
#define ELIST_C
#endif
/* Description */
/*
*
*
*/
/*
* $Log: elist.c,v $
* Revision 0.6 2004/04/06 19:34:44 ksheff
* Corrected elist_delete to update the previous node if it exists.
*
* Revision 0.5 2002/06/05 22:05:01 ksheff
* Added elist_delete.
*
* Revision 0.4 2002/06/03 23:02:01 ksheff
* Added the function elist_sort().
*
* Revision 0.3 2002/04/23 01:49:48 ksheff
* Added a define for NULL if it doesn't exist.
*
* Revision 0.2 2002/03/07 07:33:28 ksheff
* silenced compiler warnings for calloc return value.
*
* Revision 0.1 2002/03/07 07:24:35 ksheff
* initial revision
*
*/
/* Feature Test Switches */
/* Headers */
#include <memory.h>
#include <stdlib.h>
#include "elist.h"
#ifndef NULL
#define NULL ((void *)0)
#endif
elist_t *
elist_new()
{
elist_t *list;
list = (elist_t *) calloc(sizeof(elist_t), 1);
return list;
}
elist_t *
elist_delete(elist_t *l, void (*data_free)(void *))
{
elist_t *n;
if (l)
{
n = l->next;
if (n)
n->prev = l->prev;
if (l->prev)
l->prev->next = n;
if (data_free && l->data)
(*data_free)(l->data);
free(l);
l = n;
}
return(l);
}
void
elist_free(elist_t *l, void (*data_free)(void *))
{
if (l)
{
do
{
l = elist_delete(l, data_free);
} while (l);
}
}
elist_t *
elist_append(elist_t *l, void *data)
{
elist_t *n;
elist_t *t;
if (NULL == (n = elist_new()))
return(NULL);
n->data = data;
if (l)
{
t = l;
while (t->next != NULL) t = t->next;
t->next = n;
n->prev = t;
}
else
l = n;
return(l);
}
elist_t *
elist_insert(elist_t *l, void *data)
{
elist_t *n;
if (NULL == (n = elist_new()))
return(NULL);
n->data = data;
if (l)
{
n->prev = l->prev;
l->prev = n;
n->next = l;
if (n->prev)
n->prev->next = n;
}
l = n;
return(l);
}
void elist_sort(elist_t *l, int (*sort_func)(const void *, const void *), int reverse)
{
int c=0;
elist_t *tl;
void **data;
void **dptr;
if (l != NULL && sort_func != NULL)
{
/* count the number of nodes */
tl = l;
while (tl != NULL)
{
c++;
tl = tl->next;
}
/* if there are more than 1 nodes, allocate a lookup table */
if (c > 1 && (NULL != (data = (void **) malloc(c*sizeof(void*)))))
{
/* fill in the lookup table */
tl = l;
dptr = data;
while (tl != NULL)
{
*dptr++ = tl->data;
tl = tl->next;
}
qsort(data, c, sizeof(dptr), sort_func);
/* now fill in the data pointers in the linked list with the
* data nodes in the correct order
*/
tl = l;
if (reverse)
{
dptr = data + c - 1;
while (tl != NULL)
{
tl->data = *dptr--;
tl = tl->next;
}
}
else
{
dptr = data;
while (tl != NULL)
{
tl->data = *dptr++;
tl = tl->next;
}
}
free(data);
}
}
}
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