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glib_compat: lift g_list_sort() & g_slist_sort() from glib code
This commit is contained in:
Nguyen Anh Quynh
parent
b05087d314
commit
fba6046fd0
@ -178,49 +178,99 @@ GList *g_list_remove_link(GList *list, GList *llink)
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return list;
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}
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GList *g_list_sort(GList *list, GCompareFunc compare)
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// code copied from glib/glist.c, version 2.28.0
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static GList *g_list_sort_merge(GList *l1,
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GList *l2,
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GFunc compare_func,
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gpointer user_data)
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{
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GList *i, *it, *j;
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/* base case for singletons or empty lists */
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if (list == NULL || list->next == NULL) return list;
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i = list;
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j = i->next;
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/* i walks half as fast as j, ends up in middle */
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while (j) {
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j = j->next;
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if (j) {
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i = i->next;
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j = j->next;
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}
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}
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/* split the list midway */
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j = i->next;
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j->prev = NULL; /* make j the head of its own list */
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i->next = NULL;
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/* will never have NULL return from either call below */
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i = g_list_sort(list, compare);
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j = g_list_sort(j, compare);
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if ((*compare)(i->data, j->data) <= 0) {
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list = i;
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i = i->next;
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} else {
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list = j;
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j = j->next;
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}
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it = list;
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while (i && j) {
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if ((*compare)(i->data, j->data) <= 0) {
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it->next = i;
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i = i->next;
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} else {
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it->next = j;
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j = j->next;
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}
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it = it->next;
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}
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if (i) it->next = i;
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else it->next = j;
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return list;
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GList list, *l, *lprev;
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gint cmp;
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l = &list;
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lprev = NULL;
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while (l1 && l2)
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{
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cmp = ((GCompareDataFunc) compare_func) (l1->data, l2->data, user_data);
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if (cmp <= 0)
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{
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l->next = l1;
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l1 = l1->next;
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}
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else
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{
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l->next = l2;
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l2 = l2->next;
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}
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l = l->next;
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l->prev = lprev;
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lprev = l;
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}
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l->next = l1 ? l1 : l2;
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l->next->prev = l;
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return list.next;
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}
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static GList *g_list_sort_real(GList *list,
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GFunc compare_func,
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gpointer user_data)
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{
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GList *l1, *l2;
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if (!list)
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return NULL;
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if (!list->next)
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return list;
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l1 = list;
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l2 = list->next;
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while ((l2 = l2->next) != NULL)
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{
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if ((l2 = l2->next) == NULL)
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break;
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l1 = l1->next;
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}
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l2 = l1->next;
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l1->next = NULL;
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return g_list_sort_merge (g_list_sort_real (list, compare_func, user_data),
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g_list_sort_real (l2, compare_func, user_data),
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compare_func,
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user_data);
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}
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/**
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* g_list_sort:
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* @list: a #GList
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* @compare_func: the comparison function used to sort the #GList.
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* This function is passed the data from 2 elements of the #GList
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* and should return 0 if they are equal, a negative value if the
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* first element comes before the second, or a positive value if
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* the first element comes after the second.
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*
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* Sorts a #GList using the given comparison function.
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*
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* Returns: the start of the sorted #GList
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*/
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/**
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* GCompareFunc:
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* @a: a value.
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* @b: a value to compare with.
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* @Returns: negative value if @a < @b; zero if @a = @b; positive
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* value if @a > @b.
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*
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* Specifies the type of a comparison function used to compare two
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* values. The function should return a negative integer if the first
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* value comes before the second, 0 if they are equal, or a positive
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* integer if the first value comes after the second.
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**/
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GList *g_list_sort (GList *list, GCompareFunc compare_func)
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{
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return g_list_sort_real (list, (GFunc) compare_func, NULL);
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}
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/* END of g_list related functions */
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@ -267,48 +317,82 @@ GSList *g_slist_prepend(GSList *list, gpointer data)
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return head;
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}
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GSList *g_slist_sort(GSList *list, GCompareFunc compare)
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static GSList *g_slist_sort_merge (GSList *l1,
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GSList *l2,
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GFunc compare_func,
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gpointer user_data)
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{
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GSList *i, *it, *j;
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/* base case for singletons or empty lists */
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if (list == NULL || list->next == NULL) return list;
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i = list;
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j = i->next;
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/* i walks half as fast as j, ends up in middle */
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while (j) {
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j = j->next;
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if (j) {
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i = i->next;
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j = j->next;
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}
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}
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/* split the list midway */
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j = i->next;
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i->next = NULL;
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/* will never have NULL return from either call below */
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i = g_slist_sort(list, compare);
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j = g_slist_sort(j, compare);
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if ((*compare)(i->data, j->data) <= 0) {
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list = i;
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i = i->next;
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} else {
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list = j;
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j = j->next;
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}
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it = list;
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while (i && j) {
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if ((*compare)(i->data, j->data) <= 0) {
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it->next = i;
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i = i->next;
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} else {
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it->next = j;
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j = j->next;
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}
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it = it->next;
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}
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if (i) it->next = i;
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else it->next = j;
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return list;
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GSList list, *l;
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gint cmp;
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l=&list;
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while (l1 && l2)
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{
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cmp = ((GCompareDataFunc) compare_func) (l1->data, l2->data, user_data);
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if (cmp <= 0)
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{
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l=l->next=l1;
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l1=l1->next;
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}
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else
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{
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l=l->next=l2;
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l2=l2->next;
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}
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}
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l->next= l1 ? l1 : l2;
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return list.next;
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}
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static GSList *g_slist_sort_real (GSList *list,
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GFunc compare_func,
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gpointer user_data)
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{
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GSList *l1, *l2;
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if (!list)
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return NULL;
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if (!list->next)
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return list;
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l1 = list;
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l2 = list->next;
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while ((l2 = l2->next) != NULL)
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{
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if ((l2 = l2->next) == NULL)
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break;
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l1=l1->next;
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}
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l2 = l1->next;
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l1->next = NULL;
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return g_slist_sort_merge (g_slist_sort_real (list, compare_func, user_data),
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g_slist_sort_real (l2, compare_func, user_data),
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compare_func,
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user_data);
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}
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/**
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* g_slist_sort:
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* @list: a #GSList
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* @compare_func: the comparison function used to sort the #GSList.
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* This function is passed the data from 2 elements of the #GSList
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* and should return 0 if they are equal, a negative value if the
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* first element comes before the second, or a positive value if
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* the first element comes after the second.
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*
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* Sorts a #GSList using the given comparison function.
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*
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* Returns: the start of the sorted #GSList
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*/
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GSList *g_slist_sort (GSList *list,
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GCompareFunc compare_func)
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{
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return g_slist_sort_real (list, (GFunc) compare_func, NULL);
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}
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/* END of g_slist related functions */
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@ -44,11 +44,13 @@ typedef unsigned int guint;
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typedef char gchar;
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typedef int gboolean;
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typedef gint (*GCompareDataFunc)(gconstpointer a,
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gconstpointer b,
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gpointer user_data);
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typedef void (*GFunc)(gpointer data, gpointer user_data);
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typedef gint (*GCompareFunc)(gconstpointer v1, gconstpointer v2);
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typedef void (*GDestroyNotify)(gpointer data);
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guint g_direct_hash(gconstpointer v);
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guint g_str_hash(gconstpointer v);
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gboolean g_str_equal(gconstpointer v1, gconstpointer v2);
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guint g_int_hash(gconstpointer v);
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