X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fctype%2Fisalpha.c;fp=functions%2Fctype%2Fisalpha.c;h=2bde75570f7d4ab5255539f41c8a0a6838af0b15;hb=36b77c1eaf2ffddb76ef8ed2e6acd046682875c7;hp=0000000000000000000000000000000000000000;hpb=a441890ee6e346603bf5aeeb8a9694980118319f;p=pdclib

diff --git a/functions/ctype/isalpha.c b/functions/ctype/isalpha.c
new file mode 100644
index 0000000..2bde755
--- /dev/null
+++ b/functions/ctype/isalpha.c
@@ -0,0 +1,33 @@
+/* $Id$ */
+
+/* isalpha( 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 isalpha( int c )
+{
+    return ( _PDCLIB_locale_info.ctype[c].flags & _PDCLIB_CTYPE_ALPHA );
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( isalpha( 'a' ) );
+    TESTCASE( isalpha( 'z' ) );
+    TESTCASE( ! isalpha( ' ' ) );
+    TESTCASE( ! isalpha( '1' ) );
+    TESTCASE( ! isalpha( '@' ) );
+    return TEST_RESULTS;
+}
+
+#endif