1 files changed, 92 insertions, 0 deletions
diff --git a/unix/os/net/inetaddr.c b/unix/os/net/inetaddr.c
new file mode 100644
index 00000000..9d96d252
--- /dev/null
+++ b/unix/os/net/inetaddr.c
@@ -0,0 +1,92 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#include "ctype.h"
+#include "types.h"
+#include "in.h"
+
+/* TCP_INETADDR -- Internet address interpretation routine.  Decode a network
+ * address from the host name table.  The value returned is in network order.
+ */
+u_long
+tcp_inetaddr (cp)
+register char *cp;
+{
+	register u_long val, base, n;
+	register char c;
+	u_long	parts[4], *pp = parts;
+
+again:
+	/* Collect number up to ``.''.
+	 * Values are specified as for C:
+	 * 0x=hex, 0=octal, other=decimal.
+	 */
+	val = 0; base = 10;
+	if (*cp == '0')
+	    base = 8, cp++;
+	if (*cp == 'x' || *cp == 'X')
+	    base = 16, cp++;
+
+	while (c = *cp) {
+	    if (isdigit(c)) {
+		val = (val * base) + (c - '0');
+		cp++;
+		continue;
+	    }
+	    if (base == 16 && isxdigit(c)) {
+		val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
+		cp++;
+		continue;
+	    }
+	    break;
+	}
+
+	if (*cp == '.') {
+	    /* Internet format:
+	     *	a.b.c.d
+	     *	a.b.c	(with c treated as 16-bits)
+	     *	a.b	(with b treated as 24 bits)
+	     */
+	    if (pp >= parts + 4)
+		return (-1);
+	    *pp++ = val, cp++;
+	    goto again;
+	}
+
+	/* Check for trailing characters.
+	 */
+	if (*cp && !isspace(*cp))
+	    return (-1);
+	*pp++ = val;
+
+	/* Concoct the address according to
+	 * the number of parts specified.
+	 */
+	n = pp - parts;
+	switch (n) {
+
+	case 1:				/* a -- 32 bits */
+		val = parts[0];
+		break;
+
+	case 2:				/* a.b -- 8.24 bits */
+		val = (parts[0] << 24) | (parts[1] & 0xffffff);
+		break;
+
+	case 3:				/* a.b.c -- 8.8.16 bits */
+		val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
+			(parts[2] & 0xffff);
+		break;
+
+	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
+		val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
+		      ((parts[2] & 0xff) << 8) | (parts[3] & 0xff);
+		break;
+
+	default:
+		return (-1);
+	}
+
+	val = htonl(val);
+	return (val);
+}