merge sources into single tree

1 files changed, 29 insertions, 0 deletions

diff --git a/src/ctype/isxdigit.c b/src/ctype/isxdigit.c
new file mode 100644
index 00000000..37857d92
--- /dev/null
+++ b/src/ctype/isxdigit.c
@@ -0,0 +1,29 @@
+#include <ctype.h>
+#include "limits.h"
+#include "nonstd/assert.h"
+#include "nonstd/ctype.h"
+#include "nonstd/internal.h"
+
+/** test whether a character is a hexadecimal digit **/
+int isxdigit(int c)
+{
+	unsigned int *map = __libc(CTYPE);
+
+	ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
+	/*
+	RETURN(NONZERO, ARGUMENT(c) is a hexadecimal digit);
+	RETURN(0, ARGUMENT(c) is not a hexadecimal digit);
+	*/
+	return map[c] & XDIGIT;
+}
+
+/***
+tests whether ARGUMENT(c) is a character in the class CHARACTER_CLASS(xdigit)
+in the current locale.
+***/
+
+/*
+LC_CTYPE
+C_LOCALE(`THIS() is true for the characters CHAR(0), CHAR(1), CHAR(2), CHAR(3), CHAR(4), CHAR(5), CHAR(6), CHAR(7), CHAR(8), CHAR(9), CHAR(a), CHAR(b), CHAR(c), CHAR(d), CHAR(e), CHAR(f), CHAR(A), CHAR(B), CHAR(C), CHAR(D), CHAR(E), and CHAR(F)')
+STDC(1)
+*/