nano

commit b2c63c3d3c59f717d30533cae6aafd10f3e710c9
parent ae139021eb7044365aefa3cf03a89a2631334e4d
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Thu, 12 Mar 2020 15:42:52 +0100

chars: optimize a function for the most common blanks: space and tab

Also, do not bother to provide separate code for the non-UTF-8 case.
Instead, optimize for plain ASCII characters.

Diffstat:
M
src/chars.c
 | 
8
+++-----

1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/src/chars.c b/src/chars.c
@@ -79,17 +79,15 @@ bool is_alnum_char(const char *c)
 /* Return TRUE when the given character is space or tab or other whitespace. */
 bool is_blank_char(const char *c)
 {
-#ifdef ENABLE_UTF8
-	if (use_utf8) {
 		wchar_t wc;
 
+	if ((signed char)*c >= 0)
+		return (*c == ' ' || *c == TAB_CODE);
+
 		if (mbtowc(&wc, c, MAXCHARLEN) < 0)
 			return FALSE;
 
 		return iswblank(wc);
-	} else
-#endif
-		return isblank((unsigned char)*c);
 }
 
 /* Return TRUE when the given character is a control character. */