reftable/stack: index segments with `size_t`

We use `int`s to index into arrays of segments and track the length of
them, which is considered to be a code smell in the Git project. Convert
the code to use `size_t` instead.

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

3 files changed, 17 insertions, 21 deletions

diff --git a/reftable/stack.c b/reftable/stack.c
index 1de2f6751c..5da4ea8141 100644
--- a/reftable/stack.c
+++ b/reftable/stack.c
@@ -1202,12 +1202,11 @@ int fastlog2(uint64_t sz)
 	return l - 1;
 }
 
-struct segment *sizes_to_segments(int *seglen, uint64_t *sizes, int n)
+struct segment *sizes_to_segments(size_t *seglen, uint64_t *sizes, size_t n)
 {
 	struct segment *segs = reftable_calloc(n, sizeof(*segs));
-	int next = 0;
 	struct segment cur = { 0 };
-	int i = 0;
+	size_t next = 0, i;
 
 	if (n == 0) {
 		*seglen = 0;
@@ -1233,29 +1232,27 @@ struct segment *sizes_to_segments(int *seglen, uint64_t *sizes, int n)
 	return segs;
 }
 
-struct segment suggest_compaction_segment(uint64_t *sizes, int n)
+struct segment suggest_compaction_segment(uint64_t *sizes, size_t n)
 {
-	int seglen = 0;
-	struct segment *segs = sizes_to_segments(&seglen, sizes, n);
 	struct segment min_seg = {
 		.log = 64,
 	};
-	int i = 0;
+	struct segment *segs;
+	size_t seglen = 0, i;
+
+	segs = sizes_to_segments(&seglen, sizes, n);
 	for (i = 0; i < seglen; i++) {
-		if (segment_size(&segs[i]) == 1) {
+		if (segment_size(&segs[i]) == 1)
 			continue;
-		}
 
-		if (segs[i].log < min_seg.log) {
+		if (segs[i].log < min_seg.log)
 			min_seg = segs[i];
-		}
 	}
 
 	while (min_seg.start > 0) {
-		int prev = min_seg.start - 1;
-		if (fastlog2(min_seg.bytes) < fastlog2(sizes[prev])) {
+		size_t prev = min_seg.start - 1;
+		if (fastlog2(min_seg.bytes) < fastlog2(sizes[prev]))
 			break;
-		}
 
 		min_seg.start = prev;
 		min_seg.bytes += sizes[prev];
diff --git a/reftable/stack.h b/reftable/stack.h
index c1e3efa899..d919455669 100644
--- a/reftable/stack.h
+++ b/reftable/stack.h
@@ -32,13 +32,13 @@ struct reftable_stack {
 int read_lines(const char *filename, char ***lines);
 
 struct segment {
-	int start, end;
+	size_t start, end;
 	int log;
 	uint64_t bytes;
 };
 
 int fastlog2(uint64_t sz);
-struct segment *sizes_to_segments(int *seglen, uint64_t *sizes, int n);
-struct segment suggest_compaction_segment(uint64_t *sizes, int n);
+struct segment *sizes_to_segments(size_t *seglen, uint64_t *sizes, size_t n);
+struct segment suggest_compaction_segment(uint64_t *sizes, size_t n);
 
 #endif
diff --git a/reftable/stack_test.c b/reftable/stack_test.c
index 289e902146..2d5b24e5c5 100644
--- a/reftable/stack_test.c
+++ b/reftable/stack_test.c
@@ -711,7 +711,7 @@ static void test_sizes_to_segments(void)
 	uint64_t sizes[] = { 2, 3, 4, 5, 7, 9 };
 	/* .................0  1  2  3  4  5 */
 
-	int seglen = 0;
+	size_t seglen = 0;
 	struct segment *segs =
 		sizes_to_segments(&seglen, sizes, ARRAY_SIZE(sizes));
 	EXPECT(segs[2].log == 3);
@@ -726,7 +726,7 @@ static void test_sizes_to_segments(void)
 
 static void test_sizes_to_segments_empty(void)
 {
-	int seglen = 0;
+	size_t seglen = 0;
 	struct segment *segs = sizes_to_segments(&seglen, NULL, 0);
 	EXPECT(seglen == 0);
 	reftable_free(segs);
@@ -735,8 +735,7 @@ static void test_sizes_to_segments_empty(void)
 static void test_sizes_to_segments_all_equal(void)
 {
 	uint64_t sizes[] = { 5, 5 };
-
-	int seglen = 0;
+	size_t seglen = 0;
 	struct segment *segs =
 		sizes_to_segments(&seglen, sizes, ARRAY_SIZE(sizes));
 	EXPECT(seglen == 1);