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implement stable sort for lists

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also change sort_workspaces() to use it
This commit is contained in:
Zandr Martin 2016-06-02 15:48:14 -05:00
parent 09670fc1a7
commit 9ccc92705e
4 changed files with 64 additions and 5 deletions
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59
common/list.c
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@ -59,7 +59,7 @@ void list_cat(list_t *list, list_t *source) {
}
}
void list_qsort(list_t* list, int compare(const void *left, const void *right)) {
void list_qsort(list_t *list, int compare(const void *left, const void *right)) {
qsort(list->items, list->length, sizeof(void *), compare);
}
@ -72,3 +72,60 @@ int list_seq_find(list_t *list, int compare(const void *item, const void *data),
}
return -1;
}
static void list_swap(list_t *list, int src, int dest) {
void *tmp = list->items[src];
list->items[src] = list->items[dest];
list->items[dest] = tmp;
}
static void list_rotate(list_t *list, int from, int to) {
void *tmp = list->items[to];
while (to > from) {
list->items[to] = list->items[to - 1];
to--;
}
list->items[from] = tmp;
}
static void list_inplace_merge(list_t *list, int left, int last, int mid, int compare(const void *a, const void *b)) {
int right = mid + 1;
if (compare(&list->items[mid], &list->items[right]) <= 0) {
return;
}
while (left <= mid && right <= last) {
if (compare(&list->items[left], &list->items[right]) <= 0) {
left++;
} else {
list_rotate(list, left, right);
left++;
mid++;
right++;
}
}
}
static void list_inplace_sort(list_t *list, int first, int last, int compare(const void *a, const void *b)) {
if (first >= last) {
return;
} else if ((last - first) == 1) {
if (compare(&list->items[first], &list->items[last]) > 0) {
list_swap(list, first, last);
}
} else {
int mid = (int)((last + first) / 2);
list_inplace_sort(list, first, mid, compare);
list_inplace_sort(list, mid + 1, last, compare);
list_inplace_merge(list, first, last, mid, compare);
}
}
void list_stable_sort(list_t *list, int compare(const void *a, const void *b)) {
if (list->length > 1) {
list_inplace_sort(list, 0, list->length - 1, compare);
}
}