commit 39964614b742c4ec98a326762d98470cb987a45b
from: Tor Andersson <tor@ccxvii.net>
via: Christoph Lohmann <20h@r-36.net>
date: Wed Mar  9 21:01:25 2016 UTC

st: Fix off-by-one error when calculating character width.

LEN(str) is one larger than strlen(str) because it also counts the zero
terminator. The original code would include the .notdef glyph (since it'll
try to encode character 0, which gets encoded to the .notdef glyph) when
measuring the average dimensions of printable ascii characters.

This causes problems with fonts like GNU Unifont where the .notdef glyph is
not the same width as the usual half-width characters.

Signed-off-by: Christoph Lohmann <20h@r-36.net>

commit - 0e48a1995eee1c2babc58523ef0be296e4b1c3e8
commit + 39964614b742c4ec98a326762d98470cb987a45b
blob - f2b309562c3111455e024c03ff89de8e8d333616
blob + 839136ddf906c5cf674fb039f6f534ae8893d8d8
--- st.c
+++ st.c
@@ -3291,7 +3291,7 @@ xloadfont(Font *f, FcPattern *pattern)
 
 	XftTextExtentsUtf8(xw.dpy, f->match,
 		(const FcChar8 *) ascii_printable,
-		LEN(ascii_printable), &extents);
+		strlen(ascii_printable), &extents);
 
 	f->set = NULL;
 	f->pattern = FcPatternDuplicate(pattern);
@@ -3302,7 +3302,7 @@ xloadfont(Font *f, FcPattern *pattern)
 	f->rbearing = f->match->max_advance_width;
 
 	f->height = f->ascent + f->descent;
-	f->width = DIVCEIL(extents.xOff, LEN(ascii_printable));
+	f->width = DIVCEIL(extents.xOff, strlen(ascii_printable));
 
 	return 0;
 }