1 files changed, 43 insertions, 0 deletions
diff --git a/newlib/libc/ctype/isdigit.c b/newlib/libc/ctype/isdigit.c
new file mode 100644
index 0000000..5c21898
--- /dev/null
+++ b/newlib/libc/ctype/isdigit.c
@@ -0,0 +1,43 @@
+/*
+FUNCTION
+<<isdigit>>---decimal digit predicate
+
+INDEX
+isdigit
+
+ANSI_SYNOPSIS
+#include <ctype.h>
+int isdigit(int <[c]>);
+
+TRAD_SYNOPSIS
+#include <ctype.h>
+int isdigit(<[c]>);
+
+DESCRIPTION
+<<isdigit>> is a macro which classifies ASCII integer values by table
+lookup.  It is a predicate returning non-zero for decimal digits, and 0 for
+other characters.  It is defined only when <<isascii>>(<[c]>) is true
+or <[c]> is EOF.
+
+You can use a compiled subroutine instead of the macro definition by
+undefining the macro using `<<#undef isdigit>>'.
+
+RETURNS
+<<isdigit>> returns non-zero if <[c]> is a decimal digit (<<0>>--<<9>>).
+
+PORTABILITY
+<<isdigit>> is ANSI C.
+
+No supporting OS subroutines are required.
+*/
+
+#include <_ansi.h>
+#include <ctype.h>
+
+
+#undef isdigit
+int
+_DEFUN(isdigit,(c),int c)
+{
+	return((_ctype_ + 1)[c] & _N);
+}