merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/mergesort.c

@@ -0,0 +1,73 @@
+#include "cache.h"
+#include "mergesort.h"
+
+struct mergesort_sublist {
+	void *ptr;
+	unsigned long len;
+};
+
+static void *get_nth_next(void *list, unsigned long n,
+			  void *(*get_next_fn)(const void *))
+{
+	while (n-- && list)
+		list = get_next_fn(list);
+	return list;
+}
+
+static void *pop_item(struct mergesort_sublist *l,
+		      void *(*get_next_fn)(const void *))
+{
+	void *p = l->ptr;
+	l->ptr = get_next_fn(l->ptr);
+	l->len = l->ptr ? (l->len - 1) : 0;
+	return p;
+}
+
+void *llist_mergesort(void *list,
+		      void *(*get_next_fn)(const void *),
+		      void (*set_next_fn)(void *, void *),
+		      int (*compare_fn)(const void *, const void *))
+{
+	unsigned long l;
+
+	if (!list)
+		return NULL;
+	for (l = 1; ; l *= 2) {
+		void *curr;
+		struct mergesort_sublist p, q;
+
+		p.ptr = list;
+		q.ptr = get_nth_next(p.ptr, l, get_next_fn);
+		if (!q.ptr)
+			break;
+		p.len = q.len = l;
+
+		if (compare_fn(p.ptr, q.ptr) > 0)
+			list = curr = pop_item(&q, get_next_fn);
+		else
+			list = curr = pop_item(&p, get_next_fn);
+
+		while (p.ptr) {
+			while (p.len || q.len) {
+				void *prev = curr;
+
+				if (!p.len)
+					curr = pop_item(&q, get_next_fn);
+				else if (!q.len)
+					curr = pop_item(&p, get_next_fn);
+				else if (compare_fn(p.ptr, q.ptr) > 0)
+					curr = pop_item(&q, get_next_fn);
+				else
+					curr = pop_item(&p, get_next_fn);
+				set_next_fn(prev, curr);
+			}
+			p.ptr = q.ptr;
+			p.len = l;
+			q.ptr = get_nth_next(p.ptr, l, get_next_fn);
+			q.len = q.ptr ? l : 0;
+
+		}
+		set_next_fn(curr, NULL);
+	}
+	return list;
+}