toptimize column width calculation and utf-8 encode for ASCII - st - [fork] customized build of st, the simple terminal
 (HTM) git clone git://src.adamsgaard.dk/st
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       ---
 (DIR) commit cde480c6939e62771ba3b60ef4eb848031aee9f9
 (DIR) parent 8211e36d281990a39db1853bcd454ac59e53d521
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Sat,  9 May 2020 14:03:14 +0200
       
       optimize column width calculation and utf-8 encode for ASCII
       
       In particular on OpenBSD and on glibc wcwidth() is quite expensive.
       On musl there is little difference.
       
       Diffstat:
         M st.c                                |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/st.c b/st.c
       t@@ -2307,7 +2307,7 @@ tputc(Rune u)
                Glyph *gp;
        
                control = ISCONTROL(u);
       -        if (!IS_SET(MODE_UTF8 | MODE_SIXEL)) {
       +        if (u < 127 || !IS_SET(MODE_UTF8 | MODE_SIXEL)) {
                        c[0] = u;
                        width = len = 1;
                } else {