X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=bootcensus;a=blobdiff_plain;f=src%2Flibc%2Fctype.c;h=89e7b93aca192fbf3766b468bff6205eeaec9708;hp=9676441e6d2bcc4771424b114f49268e71594882;hb=81c11bdd80190ec319a82b0402173cfb65fcbf72;hpb=d1e8a437c1fab4535f82c4c214ec3330ac32e48d

diff --git a/src/libc/ctype.c b/src/libc/ctype.c
index 9676441..89e7b93 100644
--- a/src/libc/ctype.c
+++ b/src/libc/ctype.c
@@ -1,3 +1,20 @@
+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018  John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY, without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #include "ctype.h"
 
 int isalnum(int c)
@@ -52,5 +69,5 @@ int toupper(int c)
 
 int tolower(int c)
 {
-	return isupper(c) ? (c + ('A' - 'a')) : c;
+	return isupper(c) ? (c - ('A' - 'a')) : c;
 }