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/* required for NULL */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>
#include "pad.h"
static PAD *padlist;
static int free_item(ITEM * item)
{
LIST *list, *next;
if (item->name != NULL)
G_free(item->name);
for (list = item->list; list != NULL; list = next) {
next = list->next;
if (list->value)
G_free(list->value);
G_free(list);
}
G_free(item);
return 0;
}
static ITEM *new_item(PAD * pad, const char *name)
{
ITEM *item;
item = (ITEM *) G_malloc((size_t) sizeof(ITEM));
if (item == NULL)
return (ITEM *) NULL;
item->name = G_store(name);
if (item->name == NULL) {
G_free(item);
return (ITEM *) NULL;
}
item->list = NULL;
item->next = pad->items;
if (item->next != NULL)
item->next->prev = item;
item->prev = NULL;
pad->items = item;
return item;
}
static int remove_value(ITEM * item, const char *value)
{
LIST **p = &item->list;
LIST *l = *p;
for (l = *p; l; l = *p) {
if (value && l->value && !strcmp(value, l->value)) {
*p = l->next;
if (l->value)
G_free(l->value);
G_free(l);
}
else
p = &l->next;
}
return 0;
}
int append_item(PAD * pad, const char *name, const char *value, int replace)
{
ITEM *item;
LIST *cur, *prev;
LIST *list;
if (pad == NULL)
return 0;
/* allocate a list struct and put value into it */
list = (LIST *) G_malloc((size_t) sizeof(LIST));
if (list == NULL)
return 0;
list->next = NULL;
list->value = G_store(value);
if (list->value == NULL) {
G_free(list);
return 0;
}
/* find the named item for the current pad */
item = find_item(pad, name);
if (item == NULL)
item = new_item(pad, name);
if (item == NULL)
return 0;
/* remove any existing occurences of the value */
if (replace)
remove_value(item, value);
/* add the LIST at the end of the item LIST */
prev = NULL;
for (cur = item->list; cur != NULL; cur = cur->next)
prev = cur;
if (prev == NULL)
item->list = list;
else
prev->next = list;
return 1;
}
int delete_item(PAD * pad, const char *name)
{
ITEM *item;
item = find_item(pad, name);
if (item == NULL)
return 0;
if (item->prev == NULL)
pad->items = item->next;
else
item->prev->next = item->next;
if (item->next != NULL)
item->next->prev = item->prev;
/* free the item */
free_item(item);
return 1;
}
ITEM *find_item(PAD * pad, const char *name)
{
ITEM *item;
if (pad != NULL)
for (item = pad->items; item != NULL; item = item->next)
if (strcmp(name, item->name) == 0)
return item;
return (ITEM *) NULL;
}
PAD *pad_list(void)
{
return padlist;
}
static int delink_pad(PAD * pad)
{
if (pad == NULL)
return 1;
if (pad->prev == NULL)
padlist = pad->next;
else
pad->prev->next = pad->next;
if (pad->next != NULL)
pad->next->prev = pad->prev;
return 0;
}
int create_pad(const char *name)
{
PAD *pad;
pad = (PAD *) G_malloc((size_t) sizeof(PAD));
if (pad == NULL)
return 0;
pad->name = G_store(name);
if (pad->name == NULL) {
G_free(pad);
return 0;
}
pad->items = NULL;
pad->next = padlist;
if (pad->next != NULL)
pad->next->prev = pad;
pad->prev = NULL;
padlist = pad;
return 1;
}
int delete_pad(PAD * pad)
{
ITEM *item, *next;
if (pad == NULL)
return 0;
delink_pad(pad);
/* free the items */
for (item = pad->items; item != NULL; item = next) {
next = item->next;
free_item(item);
}
G_free(pad);
return 1;
}
PAD *find_pad(const char *name)
{
PAD *pad;
for (pad = padlist; pad != NULL; pad = pad->next)
if (strcmp(name, pad->name) == 0)
return pad;
return (PAD *) NULL;
}
int invent_pad(char *name)
{
static int i = 0;
do
sprintf(name, "%d", ++i);
while (find_pad(name) != NULL);
return 0;
}
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