reftable/stack: use size_t to track stack length

While the stack length is already stored as `size_t`, we frequently use
`int`s to refer to those stacks throughout the reftable library. Convert
those cases to use `size_t` instead to make things consistent.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

reftable/basics.c

@@ -64,12 +64,11 @@ void free_names(char **a)
 	reftable_free(a);
 }
 
-int names_length(char **names)
+size_t names_length(char **names)
 {
 	char **p = names;
-	for (; *p; p++) {
-		/* empty */
-	}
+	while (*p)
+		p++;
 	return p - names;
 }
 

reftable/basics.h

@@ -44,7 +44,7 @@ void parse_names(char *buf, int size, char ***namesp);
 int names_equal(char **a, char **b);
 
 /* returns the array size of a NULL-terminated array of strings. */
-int names_length(char **names);
+size_t names_length(char **names);
 
 /* Allocation routines; they invoke the functions set through
  * reftable_set_alloc() */

reftable/merged.c

@@ -45,11 +45,10 @@ static int merged_iter_init(struct merged_iter *mi)
 static void merged_iter_close(void *p)
 {
 	struct merged_iter *mi = p;
-	int i = 0;
+
 	merged_iter_pqueue_release(&mi->pq);
-	for (i = 0; i < mi->stack_len; i++) {
+	for (size_t i = 0; i < mi->stack_len; i++)
 		reftable_iterator_destroy(&mi->stack[i]);
-	}
 	reftable_free(mi->stack);
 	strbuf_release(&mi->key);
 	strbuf_release(&mi->entry_key);
@@ -168,14 +167,14 @@ static void iterator_from_merged_iter(struct reftable_iterator *it,
 }
 
 int reftable_new_merged_table(struct reftable_merged_table **dest,
-			      struct reftable_table *stack, int n,
+			      struct reftable_table *stack, size_t n,
 			      uint32_t hash_id)
 {
 	struct reftable_merged_table *m = NULL;
 	uint64_t last_max = 0;
 	uint64_t first_min = 0;
-	int i = 0;
-	for (i = 0; i < n; i++) {
+
+	for (size_t i = 0; i < n; i++) {
 		uint64_t min = reftable_table_min_update_index(&stack[i]);
 		uint64_t max = reftable_table_max_update_index(&stack[i]);
 

reftable/merged_test.c

@@ -88,18 +88,17 @@ static struct reftable_merged_table *
 merged_table_from_records(struct reftable_ref_record **refs,
 			  struct reftable_block_source **source,
 			  struct reftable_reader ***readers, int *sizes,
-			  struct strbuf *buf, int n)
+			  struct strbuf *buf, size_t n)
 {
-	int i = 0;
 	struct reftable_merged_table *mt = NULL;
-	int err;
 	struct reftable_table *tabs;
+	int err;
 
 	REFTABLE_CALLOC_ARRAY(tabs, n);
 	REFTABLE_CALLOC_ARRAY(*readers, n);
 	REFTABLE_CALLOC_ARRAY(*source, n);
 
-	for (i = 0; i < n; i++) {
+	for (size_t i = 0; i < n; i++) {
 		write_test_table(&buf[i], refs[i], sizes[i]);
 		block_source_from_strbuf(&(*source)[i], &buf[i]);
 
@@ -263,18 +262,17 @@ static struct reftable_merged_table *
 merged_table_from_log_records(struct reftable_log_record **logs,
 			      struct reftable_block_source **source,
 			      struct reftable_reader ***readers, int *sizes,
-			      struct strbuf *buf, int n)
+			      struct strbuf *buf, size_t n)
 {
-	int i = 0;
 	struct reftable_merged_table *mt = NULL;
-	int err;
 	struct reftable_table *tabs;
+	int err;
 
 	REFTABLE_CALLOC_ARRAY(tabs, n);
 	REFTABLE_CALLOC_ARRAY(*readers, n);
 	REFTABLE_CALLOC_ARRAY(*source, n);
 
-	for (i = 0; i < n; i++) {
+	for (size_t i = 0; i < n; i++) {
 		write_test_log_table(&buf[i], logs[i], sizes[i], i + 1);
 		block_source_from_strbuf(&(*source)[i], &buf[i]);
 

reftable/reftable-merged.h

@@ -33,7 +33,7 @@ struct reftable_table;
    the stack array.
 */
 int reftable_new_merged_table(struct reftable_merged_table **dest,
-			      struct reftable_table *stack, int n,
+			      struct reftable_table *stack, size_t n,
 			      uint32_t hash_id);
 
 /* returns an iterator positioned just before 'name' */

reftable/stack.c

@@ -202,18 +202,18 @@ static struct reftable_reader **stack_copy_readers(struct reftable_stack *st,
 static int reftable_stack_reload_once(struct reftable_stack *st, char **names,
 				      int reuse_open)
 {
-	int cur_len = !st->merged ? 0 : st->merged->stack_len;
+	size_t cur_len = !st->merged ? 0 : st->merged->stack_len;
 	struct reftable_reader **cur = stack_copy_readers(st, cur_len);
-	int err = 0;
-	int names_len = names_length(names);
+	size_t names_len = names_length(names);
 	struct reftable_reader **new_readers =
 		reftable_calloc(names_len, sizeof(*new_readers));
 	struct reftable_table *new_tables =
 		reftable_calloc(names_len, sizeof(*new_tables));
-	int new_readers_len = 0;
+	size_t new_readers_len = 0;
 	struct reftable_merged_table *new_merged = NULL;
 	struct strbuf table_path = STRBUF_INIT;
-	int i;
+	int err = 0;
+	size_t i;
 
 	while (*names) {
 		struct reftable_reader *rd = NULL;
@@ -221,11 +221,10 @@ static int reftable_stack_reload_once(struct reftable_stack *st, char **names,
 
 		/* this is linear; we assume compaction keeps the number of
 		   tables under control so this is not quadratic. */
-		int j = 0;
-		for (j = 0; reuse_open && j < cur_len; j++) {
-			if (cur[j] && 0 == strcmp(cur[j]->name, name)) {
-				rd = cur[j];
-				cur[j] = NULL;
+		for (i = 0; reuse_open && i < cur_len; i++) {
+			if (cur[i] && 0 == strcmp(cur[i]->name, name)) {
+				rd = cur[i];
+				cur[i] = NULL;
 				break;
 			}
 		}
@@ -870,7 +869,7 @@ static int stack_write_compact(struct reftable_stack *st,
 			       size_t first, size_t last,
 			       struct reftable_log_expiry_config *config)
 {
-	int subtabs_len = last - first + 1;
+	size_t subtabs_len = last - first + 1;
 	struct reftable_table *subtabs = reftable_calloc(
 		last - first + 1, sizeof(*subtabs));
 	struct reftable_merged_table *mt = NULL;