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/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "wayland-util.h"
/**
* Initialize a wl_list object.
*
* list: Already-allocated wl_list.
**/
WL_EXPORT void
wl_list_init(struct wl_list *list)
{
list->prev = list;
list->next = list;
}
/**
* Add a new element to a wl_list. The new element will appear just after
* `list`.
*
* list: Head node of list to add to.
* elm: Element we are adding.
**/
WL_EXPORT void
wl_list_insert(struct wl_list *list, struct wl_list *elm)
{
elm->prev = list;
elm->next = list->next;
list->next = elm;
elm->next->prev = elm;
}
/**
* Remove `elm` from the list containing it. `elm` itself will still point into
* the list and bad things will happen if you reference it!.
*
* elm: Element to remove.
**/
WL_EXPORT void
wl_list_remove(struct wl_list *elm)
{
elm->prev->next = elm->next;
elm->next->prev = elm->prev;
}
/**
* Find the number of elements in `list`. The head node is not counted.
*
* list: Head element in list to count.
**/
WL_EXPORT int
wl_list_length(struct wl_list *list)
{
struct wl_list *e;
int count;
count = 0;
e = list->next;
while (e != list) {
e = e->next;
count++;
}
return count;
}
/**
* Determine if `list` is empty.
*
* list: Head node of list to check.
**/
WL_EXPORT int
wl_list_empty(struct wl_list *list)
{
return list->next == list;
}
/**
* Initialize a wl_array.
*
* array: Array to initialize.
**/
WL_EXPORT void
wl_array_init(struct wl_array *array)
{
memset(array, 0, sizeof *array);
}
/**
* Free any memory associated with a wl_array.
*
* array: Array to release.
**/
WL_EXPORT void
wl_array_release(struct wl_array *array)
{
free(array->data);
}
/**
* Add space for one more element of size `size` to a wl_array.
*
* array: Array to add to.
* size: Size of each element in `array`
**/
WL_EXPORT void *
wl_array_add(struct wl_array *array, int size)
{
int alloc;
void *data, *p;
if (array->alloc > 0)
alloc = array->alloc;
else
alloc = 16;
while (alloc < array->size + size)
alloc *= 2;
if (array->alloc < alloc) {
if (array->alloc > 0)
data = realloc(array->data, alloc);
else
data = malloc(alloc);
if (data == NULL)
return 0;
array->data = data;
array->alloc = alloc;
}
p = array->data + array->size;
array->size += size;
return p;
}
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