reftable: address trivial -Wsign-compare warnings

Address the last couple of trivial -Wsign-compare warnings in the
reftable library and remove the DISABLE_SIGN_COMPARE_WARNINGS macro that
we have in "reftable/system.h".

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

reftable/record.c

@@ -126,7 +126,7 @@ static int decode_string(struct reftable_buf *dest, struct string_view in)
 static int encode_string(const char *str, struct string_view s)
 {
 	struct string_view start = s;
-	int l = strlen(str);
+	size_t l = strlen(str);
 	int n = put_var_int(&s, l);
 	if (n < 0)
 		return -1;
@@ -565,7 +565,6 @@ static int reftable_obj_record_decode(void *rec, struct reftable_buf key,
 	uint64_t count = val_type;
 	int n = 0;
 	uint64_t last;
-	int j;
 
 	reftable_obj_record_release(r);
 
@@ -600,8 +599,7 @@ static int reftable_obj_record_decode(void *rec, struct reftable_buf key,
 	string_view_consume(&in, n);
 
 	last = r->offsets[0];
-	j = 1;
-	while (j < count) {
+	for (uint64_t j = 1; j < count; j++) {
 		uint64_t delta = 0;
 		int n = get_var_int(&delta, &in);
 		if (n < 0) {
@@ -610,7 +608,6 @@ static int reftable_obj_record_decode(void *rec, struct reftable_buf key,
 		string_view_consume(&in, n);
 
 		last = r->offsets[j] = (delta + last);
-		j++;
 	}
 	return start.len - in.len;
 }

reftable/stack.c

@@ -220,9 +220,9 @@ void reftable_stack_destroy(struct reftable_stack *st)
 	}
 
 	if (st->readers) {
-		int i = 0;
 		struct reftable_buf filename = REFTABLE_BUF_INIT;
-		for (i = 0; i < st->readers_len; i++) {
+
+		for (size_t i = 0; i < st->readers_len; i++) {
 			const char *name = reader_name(st->readers[i]);
 			int try_unlinking = 1;
 
@@ -238,6 +238,7 @@ void reftable_stack_destroy(struct reftable_stack *st)
 				unlink(filename.buf);
 			}
 		}
+
 		reftable_buf_release(&filename);
 		st->readers_len = 0;
 		REFTABLE_FREE_AND_NULL(st->readers);
@@ -568,7 +569,6 @@ static int stack_uptodate(struct reftable_stack *st)
 {
 	char **names = NULL;
 	int err;
-	int i = 0;
 
 	/*
 	 * When we have cached stat information available then we use it to
@@ -608,7 +608,7 @@ static int stack_uptodate(struct reftable_stack *st)
 	if (err < 0)
 		return err;
 
-	for (i = 0; i < st->readers_len; i++) {
+	for (size_t i = 0; i < st->readers_len; i++) {
 		if (!names[i]) {
 			err = 1;
 			goto done;
@@ -1767,14 +1767,12 @@ static int reftable_stack_clean_locked(struct reftable_stack *st)
 	}
 
 	while ((d = readdir(dir))) {
-		int i = 0;
 		int found = 0;
 		if (!is_table_name(d->d_name))
 			continue;
 
-		for (i = 0; !found && i < st->readers_len; i++) {
+		for (size_t i = 0; !found && i < st->readers_len; i++)
 			found = !strcmp(reader_name(st->readers[i]), d->d_name);
-		}
 		if (found)
 			continue;
 

reftable/system.h

@@ -11,8 +11,6 @@ license that can be found in the LICENSE file or at
 
 /* This header glues the reftable library to the rest of Git */
 
-#define DISABLE_SIGN_COMPARE_WARNINGS
-
 #include "git-compat-util.h"
 
 /*