Merge pull request #13 from ProjectRevoTPP/libc

add libc building to agbcc.

1 files changed, 46 insertions, 0 deletions

diff --git a/libc/ctype/isalnum.c b/libc/ctype/isalnum.c
new file mode 100644
index 0000000..7e05bd1
--- /dev/null
+++ b/libc/ctype/isalnum.c
@@ -0,0 +1,46 @@
+/*
+FUNCTION 
+	<<isalnum>>---alphanumeric character predicate
+
+INDEX
+	isalnum
+
+ANSI_SYNOPSIS
+	#include <ctype.h>
+	int isalnum(int <[c]>);
+
+TRAD_SYNOPSIS
+	#include <ctype.h>
+	int isalnum(<[c]>);
+
+
+DESCRIPTION
+<<isalnum>> is a macro which classifies ASCII integer values by table
+lookup.  It is a predicate returning non-zero for alphabetic or
+numeric ASCII characters, and <<0>> for other arguments.  It is defined
+for all integer values.
+
+You can use a compiled subroutine instead of the macro definition by
+undefining the macro using `<<#undef isalnum>>'.
+
+RETURNS
+<<isalnum>> returns non-zero if <[c]> is a letter (<<a>>--<<z>> or
+<<A>>--<<Z>>) or a digit (<<0>>--<<9>>).
+
+PORTABILITY
+<<isalnum>> is ANSI C.
+
+No OS subroutines are required.
+*/
+
+#include <_ansi.h>
+#include <ctype.h>
+
+#undef isalnum
+
+int
+_DEFUN(isalnum,(c),int c)
+{
+	return((_ctype_ + 1)[c] & (_U|_L|_N));
+}
+