utf8: change return type of some helpers from int to size_t

index db1f56de61a..a72e2552305 100644
@@ -53,7 +53,7 @@ static const char *annotate_opt_usage[] = {
 };
 
 static int longest_file;
-static int longest_author;
+static size_t longest_author;
 static int max_orig_digits;
 static int max_digits;
 static int max_score_digits;

@@ -529,7 +529,7 @@ static void emit_other(struct blame_scoreboard *sb, struct blame_entry *ent, int
 					name = ci.author_mail.buf;
 				else
 					name = ci.author.buf;
-				pad = longest_author - utf8_strwidth(name);
+				pad = cast_size_t_to_int(longest_author - utf8_strwidth(name));
 				printf(" (%s%*s %10s",
 				       name, pad, "",
 				       format_time(ci.author_time,

@@ -631,7 +631,7 @@ static void find_alignment(struct blame_scoreboard *sb, int *option)
 
 	for (e = sb->ent; e; e = e->next) {
 		struct blame_origin *suspect = e->suspect;
-		int num;
+		size_t num;
 
 		if (compute_auto_abbrev)
 			auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);

index 8c2305ad2c8..321c3558f2d 100644
@@ -349,7 +349,7 @@ static int calc_maxwidth(struct ref_array *refs, int remote_bonus)
 	for (i = 0; i < refs->nr; i++) {
 		struct ref_array_item *it = refs->items[i];
 		const char *desc = it->refname;
-		int w;
+		size_t w;
 
 		skip_prefix(it->refname, "refs/heads/", &desc);
 		skip_prefix(it->refname, "refs/remotes/", &desc);

index 46a793411a4..fee992c3c14 100644
@@ -705,7 +705,7 @@ static int refcol_width(const struct ref *ref_map, int compact_format)
 		max = max * 2 / 3;
 
 	for (ref = ref_map; ref; ref = ref->next) {
-		int rlen, llen = 0, len;
+		size_t rlen, llen = 0, len;
 
 		if (ref->status == REF_STATUS_REJECT_SHALLOW ||
 		    !ref->peer_ref ||

index 9c76b62b02d..bdbf46fb658 100644
@@ -961,8 +961,8 @@ static void show_worktree_porcelain(struct worktree *wt, int line_terminator)
 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 {
 	struct strbuf sb = STRBUF_INIT;
-	int cur_path_len = strlen(wt->path);
-	int path_adj = cur_path_len - utf8_strwidth(wt->path);
+	size_t cur_path_len = strlen(wt->path);
+	int path_adj = cast_size_t_to_int(cur_path_len - utf8_strwidth(wt->path));
 	const char *reason;
 
 	strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);

index 50bbccc92ee..ec874036de6 100644
@@ -22,7 +22,7 @@ struct column_data {
 };
 
 /* return length of 's' in letters, ANSI escapes stripped */
-static int item_length(const char *s)
+static size_t item_length(const char *s)
 {
 	return utf8_strnwidth(s, strlen(s), 1);
 }

index e50def45383..4faf151345a 100644
@@ -2629,7 +2629,8 @@ void print_stat_summary(FILE *fp, int files,
 
 static void show_stats(struct diffstat_t *data, struct diff_options *options)
 {
-	int i, len, add, del, adds = 0, dels = 0;
+	int i, add, del, adds = 0, dels = 0;
+	size_t len = 0;
 	uintmax_t max_change = 0, max_len = 0;
 	int total_files = data->nr, count;
 	int width, name_width, graph_width, number_width = 0, bin_width = 0;

@@ -2780,7 +2781,8 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
 		char *name = file->print_name;
 		uintmax_t added = file->added;
 		uintmax_t deleted = file->deleted;
-		int name_len, padding;
+		size_t name_len;
+		int padding;
 
 		if (!file->is_interesting && (added + deleted == 0))
 			continue;

@@ -2809,7 +2811,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
 			if (slash)
 				name = slash;
 		}
-		padding = len - utf8_strwidth(name);
+		padding = cast_size_t_to_int(len - utf8_strwidth(name));
 		if (padding < 0)
 			padding = 0;
 

index 57facbc21ec..5a77b4f7202 100644
@@ -127,7 +127,7 @@ void git_setup_gettext(void)
 }
 
 /* return the number of columns of string 's' in current locale */
-int gettext_width(const char *s)
+size_t gettext_width(const char *s)
 {
 	static int is_utf8 = -1;
 	if (is_utf8 == -1)

index 484cafa5628..f161a21b45c 100644
@@ -31,7 +31,7 @@
 #ifndef NO_GETTEXT
 extern int git_gettext_enabled;
 void git_setup_gettext(void);
-int gettext_width(const char *s);
+size_t gettext_width(const char *s);
 #else
 #define git_gettext_enabled (0)
 static inline void git_setup_gettext(void)

index bdbed4295aa..f03493c74b1 100644
@@ -1781,7 +1781,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
 
 	if (padding < 0) {
 		const char *start = strrchr(sb->buf, '\n');
-		int occupied;
+		size_t occupied;
 		if (!start)
 			start = sb->buf;
 		occupied = utf8_strnwidth(start, strlen(start), 1);

@@ -1802,7 +1802,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
 		placeholder++;
 		total_consumed++;
 	}
-	len = utf8_strnwidth(local_sb.buf, local_sb.len, 1);
+	len = cast_size_t_to_int(utf8_strnwidth(local_sb.buf, local_sb.len, 1));
 
 	if (c->flush_type == flush_left_and_steal) {
 		const char *ch = sb->buf + sb->len - 1;

index 6bfaefa28eb..8ccdf684e07 100644
@@ -466,7 +466,7 @@ int utf8_fprintf(FILE *stream, const char *format, ...)
 
 	columns = fputs(buf.buf, stream);
 	if (0 <= columns) /* keep the error from the I/O */
-		columns = utf8_strwidth(buf.buf);
+		columns = cast_size_t_to_int(utf8_strwidth(buf.buf));
 	strbuf_release(&buf);
 	return columns;
 }

@@ -806,7 +806,7 @@ void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int wid
 		       const char *s)
 {
 	size_t slen = strlen(s);
-	int display_len = utf8_strnwidth(s, slen, 0);
+	size_t display_len = utf8_strnwidth(s, slen, 0);
 	int utf8_compensation = slen - display_len;
 
 	if (display_len >= width) {

index 7108a92b52c..c847b4bb5ed 100644
@@ -325,7 +325,7 @@ static int maxwidth(const char *(*label)(int), int minval, int maxval)
 
 	for (i = minval; i <= maxval; i++) {
 		const char *s = label(i);
-		int len = s ? utf8_strwidth(s) : 0;
+		size_t len = s ? utf8_strwidth(s) : 0;
 		if (len > result)
 			result = len;
 	}

@@ -341,7 +341,7 @@ static void wt_longstatus_print_unmerged_data(struct wt_status *s,
 	static char *padding;
 	static int label_width;
 	const char *one, *how;
-	int len;
+	size_t len;
 
 	if (!padding) {
 		label_width = maxwidth(wt_status_unmerged_status_string, 1, 7);

index 8ccdf684e07..050fc8b3cdf 100644
@@ -206,7 +206,7 @@ int utf8_width(const char **start, size_t *remainder_p)
  * string, assuming that the string is utf8.  Returns strlen() instead
  * if the string does not look like a valid utf8 string.
  */
-int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
+size_t utf8_strnwidth(const char *string, size_t len, int skip_ansi)
 {
 	const char *orig = string;
 	size_t width = 0;

@@ -224,14 +224,10 @@ int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
 			width += glyph_width;
 	}
 
-	/*
-	 * TODO: fix the interface of this function and `utf8_strwidth()` to
-	 * return `size_t` instead of `int`.
-	 */
-	return cast_size_t_to_int(string ? width : len);
+	return string ? width : len;
 }
 
-int utf8_strwidth(const char *string)
+size_t utf8_strwidth(const char *string)
 {
 	return utf8_strnwidth(string, strlen(string), 0);
 }

index 35df76086a6..cae10d5ac1f 100644
@@ -7,8 +7,8 @@ typedef unsigned int ucs_char_t;  /* assuming 32bit int */
 
 size_t display_mode_esc_sequence_len(const char *s);
 int utf8_width(const char **start, size_t *remainder_p);
-int utf8_strnwidth(const char *string, size_t len, int skip_ansi);
-int utf8_strwidth(const char *string);
+size_t utf8_strnwidth(const char *string, size_t len, int skip_ansi);
+size_t utf8_strwidth(const char *string);
 int is_utf8(const char *text);
 int is_encoding_utf8(const char *name);
 int same_encoding(const char *, const char *);