merge sources into single tree

1 files changed, 23 insertions, 0 deletions

diff --git a/src/ctype/isalnum.c b/src/ctype/isalnum.c
new file mode 100644
index 00000000..507655ae
--- /dev/null
+++ b/src/ctype/isalnum.c
@@ -0,0 +1,23 @@
+#include <ctype.h>
+#include "limits.h"
+#include "nonstd/assert.h"
+
+/** test whether a character is alphanumeric **/
+int isalnum(int c)
+{
+	ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
+	/*
+	RETURN(NONZERO, ARGUMENT(c) is an alpanumeric character);
+	RETURN(0, ARGUMENT(c) is not an alphanumeric character);
+	*/
+	return isalpha(c) || isdigit(c);
+}
+
+/***
+tests whether ARGUMENT(c) is a character in the class
+CHARACTER_CLASS(alpha) or CHARACTER_CLASS(digit) in the current locale.
+***/
+/*
+LC_CTYPE
+STDC(1)
+*/