[PATCH] utf8: use skip_iprefix() in same_utf_encoding()

["René Scharfe" <l.s.r@web.de>]

Get rid of magic numbers by using skip_iprefix() and skip_prefix() for
parsing the leading "[uU][tT][fF]-?" of both strings instead of checking
with istarts_with() and an explicit comparison.

Signed-off-by: René Scharfe <l.s.r@web.de>
---
 utf8.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/utf8.c b/utf8.c
index 5c8f151f75..5b39361ada 100644
--- a/utf8.c
+++ b/utf8.c
@@ -411,11 +411,10 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
  */
 static int same_utf_encoding(const char *src, const char *dst)
 {
-	if (istarts_with(src, "utf") && istarts_with(dst, "utf")) {
-		/* src[3] or dst[3] might be '\0' */
-		int i = (src[3] == '-' ? 4 : 3);
-		int j = (dst[3] == '-' ? 4 : 3);
-		return !strcasecmp(src+i, dst+j);
+	if (skip_iprefix(src, "utf", &src) && skip_iprefix(dst, "utf", &dst)) {
+		skip_prefix(src, "-", &src);
+		skip_prefix(dst, "-", &dst);
+		return !strcasecmp(src, dst);
 	}
 	return 0;
 }
--
2.24.0