posix: net: implement inet_ntoa()

Add an implementation of inet_ntoa().

Signed-off-by: Chris Friedt <chrisfriedt@gmail.com>

Author: cfriedt

lib/posix/options/net.c

@@ -5,6 +5,7 @@
  */
 
 #include <ctype.h>
+#include <stdio.h>
 
 #include <zephyr/posix/arpa/inet.h>
 #include <zephyr/posix/netinet/in.h>
@@ -65,3 +66,13 @@ in_addr_t inet_addr(const char *cp)
 
 	return htonl(val);
 }
+
+char *inet_ntoa(struct in_addr in)
+{
+	static char buf[INET_ADDRSTRLEN];
+	unsigned char *bytes = (unsigned char *)&in.s_addr;
+
+	snprintf(buf, sizeof(buf), "%d.%d.%d.%d", bytes[0], bytes[1], bytes[2], bytes[3]);
+
+	return buf;
+}