reinstate external visibility of inet_ntoa_r,

and add it to arpa/inet.h header.

include/arpa/inet.h

@@ -52,6 +52,8 @@ extern in_addr_t inet_network (__const char *__cp) __THROW;
 /* Convert Internet number in IN to ASCII representation.  The return value
    is a pointer to an internal array containing the string.  */
 extern char *inet_ntoa (struct in_addr __in) __THROW;
+/* Recursion-safe flavor */
+extern char *inet_ntoa_r (struct in_addr __in, char *__buf) __THROW;
 
 /* Convert from presentation format of an Internet number in buffer
    starting at CP to the binary network format and store result for

libc/inet/addr.c

@@ -122,7 +122,8 @@ libc_hidden_def(inet_addr)
 
 #define INET_NTOA_MAX_LEN	16	/* max 12 digits + 3 '.'s + 1 nul */
 
-static char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
+libc_hidden_proto(inet_ntoa_r)
+char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
 {
 	in_addr_t addr = ntohl(in.s_addr);
 	int i;
@@ -141,6 +142,7 @@ static char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
 
 	return p+1;
 }
+libc_hidden_def(inet_ntoa_r)
 
 libc_hidden_proto(inet_ntoa)
 char *inet_ntoa(struct in_addr in)