lib/vsprintf.c: Add IPV4 options %pI4[hnbl] for host, network, big and little endian

This should allow the removal of the #defines and uses
of NIPQUAD and NIPQUAD_FMT

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index e83e3e7..add0446 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -699,13 +699,37 @@ static char *mac_address_string(char *buf, char *end, u8 *addr,
        return string(buf, end, mac_addr, spec);
 }
 
-static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
+static char *ip4_string(char *p, const u8 *addr, const char *fmt)
 {
        int i;
-
+       bool leading_zeros = (fmt[0] == 'i');
+       int index;
+       int step;
+
+       switch (fmt[2]) {
+       case 'h':
+#ifdef __BIG_ENDIAN
+               index = 0;
+               step = 1;
+#else
+               index = 3;
+               step = -1;
+#endif
+               break;
+       case 'l':
+               index = 3;
+               step = -1;
+               break;
+       case 'n':
+       case 'b':
+       default:
+               index = 0;
+               step = 1;
+               break;
+       }
        for (i = 0; i < 4; i++) {
                char temp[3];   /* hold each IP quad in reverse order */
-               int digits = put_dec_trunc(temp, addr[i]) - temp;
+               int digits = put_dec_trunc(temp, addr[index]) - temp;
                if (leading_zeros) {
                        if (digits < 3)
                                *p++ = '0';
@@ -717,6 +741,7 @@ static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
                        *p++ = temp[digits];
                if (i < 3)
                        *p++ = '.';
+               index += step;
        }
        *p = '\0';
 
@@ -796,7 +821,7 @@ static char *ip6_compressed_string(char *p, const char *addr)
        if (useIPv4) {
                if (needcolon)
                        *p++ = ':';
-               p = ip4_string(p, &in6.s6_addr[12], false);
+               p = ip4_string(p, &in6.s6_addr[12], "I4");
        }
        *p = '\0';
 
@@ -836,7 +861,7 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
 {
        char ip4_addr[sizeof("255.255.255.255")];
 
-       ip4_string(ip4_addr, addr, fmt[0] == 'i');
+       ip4_string(ip4_addr, addr, fmt);
 
        return string(buf, end, ip4_addr, spec);
 }
@@ -911,6 +936,7 @@ static char *uuid_string(char *buf, char *end, const u8 *addr,
  * - 'i' [46] for 'raw' IPv4/IPv6 addresses
  *       IPv6 omits the colons (01020304...0f)
  *       IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
+ * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
  * - 'I6c' for IPv6 addresses printed as specified by
  *       http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
  * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form