[PATCH 3/5] pretty: refactor `format_sanitized_subject()`

["Hariom Verma via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Hariom Verma <hariom18599@xxxxxxxxx>

This commit refactors `format_sanitized_subject()` in the
hope to use same logic in ref-filter.c

Mentored-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
Mentored-by: Heba Waly <heba.waly@xxxxxxxxx>
Signed-off-by: Hariom Verma <hariom18599@xxxxxxxxx>
---
 pretty.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/pretty.c b/pretty.c
index 2a3d46bf42..8d08e8278a 100644
--- a/pretty.c
+++ b/pretty.c
@@ -839,24 +839,29 @@ static int istitlechar(char c)
 		(c >= '0' && c <= '9') || c == '.' || c == '_';
 }
 
-static void format_sanitized_subject(struct strbuf *sb, const char *msg)
+static void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len)
 {
+	char *r = xmemdupz(msg, len);
 	size_t trimlen;
 	size_t start_len = sb->len;
 	int space = 2;
+	int i;
 
-	for (; *msg && *msg != '\n'; msg++) {
-		if (istitlechar(*msg)) {
+	for (i = 0; i < len; i++) {
+		if (r[i] == '\n')
+			r[i] = ' ';
+		if (istitlechar(r[i])) {
 			if (space == 1)
 				strbuf_addch(sb, '-');
 			space = 0;
-			strbuf_addch(sb, *msg);
-			if (*msg == '.')
-				while (*(msg+1) == '.')
-					msg++;
+			strbuf_addch(sb, r[i]);
+			if (r[i] == '.')
+				while (r[i+1] == '.')
+					i++;
 		} else
 			space |= 1;
 	}
+	free(r);
 
 	/* trim any trailing '.' or '-' characters */
 	trimlen = 0;
@@ -1155,7 +1160,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	const struct commit *commit = c->commit;
 	const char *msg = c->message;
 	struct commit_list *p;
-	const char *arg;
+	const char *arg, *eol;
 	size_t res;
 	char **slot;
 
@@ -1405,7 +1410,8 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		format_subject(sb, msg + c->subject_off, " ");
 		return 1;
 	case 'f':	/* sanitized subject */
-		format_sanitized_subject(sb, msg + c->subject_off);
+		eol = strchrnul(msg + c->subject_off, '\n');
+		format_sanitized_subject(sb, msg + c->subject_off, eol - (msg + c->subject_off));
 		return 1;
 	case 'b':	/* body */
 		strbuf_addstr(sb, msg + c->body_off);
-- 
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