Added merge_by_header

libkeke_array.c

@@ -190,12 +190,30 @@ int compar(const void *a, const void *b, void *size_v) {
 #if defined(__BYTE_ORDER__)&&(__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
 	return memcmp(a, b, size);
 #else
-	const signed char *aa = a;
+	/*const signed char *aa = a;
 	const signed char *bb = b;
 	for(size_t i = 0; i < size; ++i) {
 		size_t s = size - i - 1;
 		if(aa[s] != bb[s]) return aa[s] - bb[s];
 	}
+	return 0;*/
+	size_t rem = size % sizeof(int);
+	if(rem) {
+		size -= rem;
+		const char *c = a;
+		const char *d = b;
+		for(size_t i = 1; i <= rem; ++i) {
+			char j = c[size + rem - i] - d[size + rem - i];
+			if(j != 0) return j;
+		}
+	}
+	const int *ia = a;
+	const int *ib = b;
+	size /= sizeof(int);
+	for(size_t i = 1; i <= size; ++i) {
+		int j = ia[size - i] - ib[size - i];
+		if(j != 0) return j;
+	}
 	return 0;
 #endif
 }
@@ -256,6 +274,44 @@ KekeArray *keke_array_merge(KekeArray *a, KekeArray *b) {
 	return c;
 }
 
+KekeArray *keke_array_merge_by_header(KekeArray *a, KekeArray *b, size_t header_size) {
+	if(a->len == 0) {
+		KekeArray *r = keke_array_clone(b);
+		keke_array_set_len(b, 0);
+		return r;
+	}
+	if(b->len == 0) {
+		KekeArray *r = keke_array_clone(a);
+		keke_array_set_len(a, 0);
+		return r;
+	}
+	keke_array_reverse(a);
+	keke_array_reverse(b);
+	if(a->type_size != b->type_size) return NULL;
+	KekeArray *c = keke_array_alloc(a->len + b->len, a->type_size);
+	keke_array_set_len(c, 0);
+	void *s = malloc(a->type_size);
+	while(!!(a->len) && !!(b->len)) {
+		if(compar(ARRAY_GET(a, a->len - 1), ARRAY_GET(b, b->len - 1), &header_size) <= 0) {
+			keke_array_pop(a, s)	;
+			keke_array_push(c, s);
+		} else {
+			keke_array_pop(b, s);
+			keke_array_push(c, s);
+		}
+	}
+	while(a->len) {
+		keke_array_pop(a, s);
+		keke_array_push(c, s);
+	}
+	while(b->len) {
+		keke_array_pop(b, s);
+		keke_array_push(c, s);
+	}
+	free(s);
+	return c;
+}
+
 KekeArray *keke_array_filter(KekeArray *array, Test_func test) {
 	KekeArray *ret = keke_array_alloc(0, array->type_size);
     for(size_t i = 0; i < array->len; i++) {