X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fctype%2Ftolower.c;fp=functions%2Fctype%2Ftolower.c;h=28c435ded8377d125f49ece8b5a8c8b2767007d4;hb=5bcc00c1b85feff1996e3f34a1a9ebf3b624161e;hp=0000000000000000000000000000000000000000;hpb=68525aefa7b7b1f2f769e287e1f2f3a4585005ff;p=pdclib

diff --git a/functions/ctype/tolower.c b/functions/ctype/tolower.c
new file mode 100644
index 0000000..28c435d
--- /dev/null
+++ b/functions/ctype/tolower.c
@@ -0,0 +1,37 @@
+/* $Id$ */
+
+/* tolower( int )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <ctype.h>
+
+#ifndef REGTEST
+
+int tolower( int c )
+{
+    if ( ( c >= 'A' ) && ( c <= 'Z' ) )
+    {
+        c += ( 'a' - 'A' );
+    }
+    return c;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( tolower( 'A' ) == 'a' );
+    TESTCASE( tolower( 'Z' ) == 'z' );
+    TESTCASE( tolower( 'a' ) == 'a' );
+    TESTCASE( tolower( 'z' ) == 'z' );
+    TESTCASE( tolower( '@' ) == '@' );
+    TESTCASE( tolower( '[' ) == '[' );
+    return TEST_RESULTS;
+}
+#endif