Copied from src/lib/libc/net/inet_pton.c

and adapted for kernel and libsa use.

sys/lib/libkern/inet_addr.c

@@ -0,0 +1,130 @@
+/*	$NetBSD: inet_addr.c,v 1.1 1997/12/12 20:14:01 gwr Exp $	*/
+
+/* Copyright (c) 1996 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/*
+ * Derived from:
+ * src/lib/libc/net/inet_pton.c
+ */
+
+#include <sys/types.h>
+
+/*
+ * Warning - these are not the standard definitions,
+ * but are the minimum sufficient for this source.
+ */
+#define isspace(c)	(((c) == ' ') || ((c) == '\t') || ((c) == '\n'))
+#define isdigit(c)	(((c) >= '0') && ((c) <= '9'))
+#define isxdigit(c)	(((c) >= 'A') && ((c) <= 'F'))
+#define toupper(c)	((c) & 0x5f)
+
+/*
+ * Ascii internet address interpretation routine.
+ * The value returned is in network order.
+ */
+u_int32_t
+inet_addr(src)
+	const char *src;
+{
+	u_int32_t val;
+	int base, n;
+	unsigned char c;
+	u_int parts[4];
+	register u_int *pp = parts;
+
+	c = *src;
+	for (;;) {
+		/*
+		 * Collect number up to ``.''.
+		 * Values are specified as for C:
+		 * 0x=hex, 0=octal, isdigit=decimal.
+		 */
+		if (!isdigit(c))
+			return (0);
+		val = 0; base = 10;
+		if (c == '0') {
+			c = *++src;
+			if (toupper(c) == 'X')
+				base = 16, c = *++src;
+			else
+				base = 8;
+		}
+		for (;;) {
+			if (isdigit(c)) {
+				val = (val * base) + (c - '0');
+				c = *++src;
+			} else if (base == 16 && isxdigit(toupper(c))) {
+				val = (val << 4) |
+					(toupper(c) + 10 - 'A');
+				c = *++src;
+			} else
+			break;
+		}
+		if (c == '.') {
+			/*
+			 * 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 + 3)
+				return (0);
+			*pp++ = val;
+			c = *++src;
+		} else
+			break;
+	}
+	/*
+	 * Check for trailing characters.
+	 */
+	if (c != '\0' && !isspace(c))
+		return (0);
+	/*
+	 * Concoct the address according to
+	 * the number of parts specified.
+	 */
+	n = pp - parts + 1;
+	switch (n) {
+
+	case 0:
+		return (0);		/* initial nondigit */
+
+	case 1:				/* a -- 32 bits */
+		break;
+
+	case 2:				/* a.b -- 8.24 bits */
+		if (val > 0xffffff)
+			return (0);
+		val |= parts[0] << 24;
+		break;
+
+	case 3:				/* a.b.c -- 8.8.16 bits */
+		if (val > 0xffff)
+			return (0);
+		val |= (parts[0] << 24) | (parts[1] << 16);
+		break;
+
+	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
+		if (val > 0xff)
+			return (0);
+		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+		break;
+	}
+
+	val = htonl(val);
+	return (val);
+}