[GSOC][PATCH v2 1/6] apply: change fields in `apply_state` to unsigned

[Zejun Zhao <jelly.zhao.42@xxxxxxxxx>]

`.max_change` and `.max_len` of `apply_state` are only used as unsigned
integers. Misuse of `int` type would cause -Wsign-comparison warnings.

Fix this by

  - change `.max_change`'s type to `unsigned` since it's just a counter

  - change `.max_len`'s type to `size_t` since it's a length

  - change the types of relevant variables in function `show_stats`

Note that `printf`'s format string requires us to do some typecast
(from `size_t` to `int`) on `max` in function `show_stats`. This is
safe because we already set a upper bound of `50` for `max` before the
cast.

Signed-off-by: Zejun Zhao <jelly.zhao.42@xxxxxxxxx>
---
 apply.c | 9 +++++----
 apply.h | 4 ++--
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/apply.c b/apply.c
index 4a7b6120ac..831b338155 100644
--- a/apply.c
+++ b/apply.c
@@ -2238,7 +2238,8 @@ static void show_stats(struct apply_state *state, struct patch *patch)
 {
 	struct strbuf qname = STRBUF_INIT;
 	char *cp = patch->new_name ? patch->new_name : patch->old_name;
-	int max, add, del;
+	size_t max;
+	unsigned add, del;
 
 	quote_c_style(cp, &qname, NULL, 0);
 
@@ -2257,12 +2258,12 @@ static void show_stats(struct apply_state *state, struct patch *patch)
 	}
 
 	if (patch->is_binary) {
-		printf(" %-*s |  Bin\n", max, qname.buf);
+		printf(" %-*s |  Bin\n", (int) max, qname.buf);
 		strbuf_release(&qname);
 		return;
 	}
 
-	printf(" %-*s |", max, qname.buf);
+	printf(" %-*s |", (int) max, qname.buf);
 	strbuf_release(&qname);
 
 	/*
@@ -2273,7 +2274,7 @@ static void show_stats(struct apply_state *state, struct patch *patch)
 	del = patch->lines_deleted;
 
 	if (state->max_change > 0) {
-		int total = ((add + del) * max + state->max_change / 2) / state->max_change;
+		unsigned total = ((add + del) * max + state->max_change / 2) / state->max_change;
 		add = (add * max + state->max_change / 2) / state->max_change;
 		del = total - add;
 	}
diff --git a/apply.h b/apply.h
index 90e887ec0e..f7f369d44f 100644
--- a/apply.h
+++ b/apply.h
@@ -90,8 +90,8 @@ struct apply_state {
 	 * we've seen, and the longest filename. That allows us to do simple
 	 * scaling.
 	 */
-	int max_change;
-	int max_len;
+	unsigned max_change;
+	size_t max_len;
 
 	/*
 	 * Records filenames that have been touched, in order to handle
-- 
2.43.0