printk: add %I4, %I6, %i4, %i6 format specifiers
For use in printing IPv4, or IPv6 addresses in the usual way:
%i4 and %I4 are currently equivalent and print the address in
dot-separated decimal x.x.x.x
%I6 prints 16-bit network order hex with colon separators:
xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
%i6 omits the colons.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index cb5bc04..a863006 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -616,6 +616,23 @@
return string(buf, end, ip6_addr, field_width, precision, flags & ~SPECIAL);
}
+static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
+ int precision, int flags)
+{
+ char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
+ char *p = ip4_addr;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ p = put_dec_trunc(p, addr[i]);
+ if (i != 3)
+ *p++ = '.';
+ }
+ *p = '\0';
+
+ return string(buf, end, ip4_addr, field_width, precision, flags & ~SPECIAL);
+}
+
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
@@ -629,6 +646,10 @@
* addresses (not the name nor the flags)
* - 'M' For a 6-byte MAC address, it prints the address in the
* usual colon-separated hex notation
+ * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
+ * decimal for v4 and colon separated network-order 16 bit hex for v6)
+ * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
+ currently the same
* - '6' For a IPv6 address prints the address in network-ordered 16 bit hex
* with colon separators
*
@@ -650,6 +671,16 @@
return mac_address_string(buf, end, ptr, field_width, precision, flags);
case '6':
return ip6_addr_string(buf, end, ptr, field_width, precision, flags);
+ case 'i':
+ flags |= SPECIAL;
+ /* Fallthrough */
+ case 'I':
+ if (fmt[1] == '6')
+ return ip6_addr_string(buf, end, ptr, field_width, precision, flags);
+ if (fmt[1] == '4')
+ return ip4_addr_string(buf, end, ptr, field_width, precision, flags);
+ flags &= ~SPECIAL;
+ break;
}
flags |= SMALL;
if (field_width == -1) {