nano

commit 5398d986eff2084ecc166a6dc4d7ae3f62b9cd28
parent b02dccc51fbefb44228f94ee859892c1d88c62d8
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Thu,  3 Oct 2019 11:09:21 +0200

tweaks: speed up determining the width of plain ASCII characters

Diffstat:
M
src/chars.c
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/chars.c b/src/chars.c
@@ -201,9 +201,11 @@ char control_mbrep(const char *c, bool isdata)
 }
 
 #ifdef ENABLE_UTF8
-/* This function is equivalent to wcwidth() for multibyte characters. */
+/* Return the width in columns of the given (multibyte) character. */
 int mbwidth(const char *c)
 {
+	/* Ask for the width only when the character isn't plain ASCII. */
+	if ((signed char)*c <= 0) {
 		wchar_t wc;
 		int width;
 
@@ -216,6 +218,8 @@ int mbwidth(const char *c)
 			return 1;
 
 		return width;
+	} else
+		return 1;
 }
 #endif