outline stuff from arpa/inet.h

1 files changed, 54 insertions, 0 deletions

diff --git a/src/arpa/inet/inet_addr.c b/src/arpa/inet/inet_addr.c
new file mode 100644
index 00000000..6073df80
--- /dev/null
+++ b/src/arpa/inet/inet_addr.c
@@ -0,0 +1,54 @@
+#include <arpa/inet.h>
+#include <stdlib.h>
+
+in_addr_t inet_addr(const char *cp)
+{
+	unsigned long parts[4] = { 0 };
+	in_addr_t addr = (in_addr_t)(-1);
+	size_t part = 0;
+
+	while (*cp && part < sizeof(parts)) {
+		char *next = NULL;
+		parts[part] = strtoul(cp, &next, 0);
+		if (*next == '.') {
+			part++;
+			cp = next + 1;
+		} else {
+			cp = next;
+		}
+
+		/* check for error */
+	}
+
+	switch (part) {
+	case 0:
+		addr = htonl(parts[0]);
+		break;
+
+	case 1:
+		if (parts[0] > 0xff || parts[1] > 0xffffff) {
+			break;
+		}
+		addr = htonl((parts[0] << 24) | parts[1]);
+		break;
+
+	case 2:
+		if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xffff) {
+			break;
+		}
+		addr = htonl((parts[0] << 24) | (parts[1] << 16) | parts[2]);
+		break;
+
+	case 3:
+		if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff || parts[3] > 0xff) {
+			break;
+		}
+		addr = htonl((parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3]);
+		break;
+
+	default:
+		break;
+	}
+
+	return addr;
+}