Commit 4aa99606 authored by Harvey Harrison's avatar Harvey Harrison Committed by David S. Miller
Browse files

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: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 96631ed1

lib/vsprintf.c

+31 −0
Original line number Diff line number Diff line
@@ -616,6 +616,23 @@ static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, 
	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 @@ static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, 
 *       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 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field 
		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) {

CRA Git | Maintained and supported by SUSTech CRA and CCSE