commit 1cc482069a3407132aeb43a55d6dc284153e79c7
author Bram Moolenaar <Bram@vim.org> Sun Apr 09 13:41:59 2017 +0200
committer Bram Moolenaar <Bram@vim.org> Sun Apr 09 13:41:59 2017 +0200
tree 704149ab8249608dfd5e6d59ead636b38d533077
parent 9f4de1f5435b900e43e19766da1a5bed4686cf44

patch 8.0.0554: toupper and tolower don't work properly for Turkish

Problem:    Toupper and tolower don't work properly for Turkish when 'casemap'
            contains "keepascii". (Bjorn Linse)
Solution:   When 'casemap' contains "keepascii" use ASCII toupper/tolower.

src/charset.c

diff --git a/src/charset.c b/src/charset.c
index cdb9e48..d649179 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1733,6 +1733,8 @@
 	if (enc_latin1like)
 	    return latin1upper[c];
     }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOUPPER_ASC(c);
     return TOUPPER_LOC(c);
 }
 
@@ -1757,6 +1759,8 @@
 	if (enc_latin1like)
 	    return latin1lower[c];
     }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOLOWER_ASC(c);
     return TOLOWER_LOC(c);
 }
 #endif