[coreboot-gerrit] New patch to review for coreboot: hexdump: Fix output if length is not a multiple of 16

[Ben Gardner (gardner.ben@gmail.com)]

Ben Gardner (gardner.ben at gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12486

-gerrit

commit 21a2bcb8f5a2b08481306b32b56b20b05de095e9
Author: Ben Gardner <gardner.ben at gmail.com>
Date:   Thu Nov 19 11:43:05 2015 -0600

    hexdump: Fix output if length is not a multiple of 16
    
    hexdump currently rounds up length to a multiple of 16.
    So, hexdump(ptr, 12) prints 16 hex digits, including 4 garbage bytes.
    That isn't desirable and is easy to fix.
    
    Change-Id: I86415fa9bc6cdc84b111e5e1968e39f570f294d9
    Signed-off-by: Ben Gardner <gardner.ben at gmail.com>
---
 src/lib/hexdump.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/lib/hexdump.c b/src/lib/hexdump.c
index 6b09379..7907a38 100644
--- a/src/lib/hexdump.c
+++ b/src/lib/hexdump.c
@@ -30,21 +30,28 @@ void hexdump(const void *memory, size_t length)
 
 	for (i = 0; i < length; i += 16) {
 		int j;
+		int left = MIN(length - i, 16);
 
-		all_zero++;
-		for (j = 0; j < 16; j++) {
-			if (m[i + j] != 0) {
-				all_zero = 0;
-				break;
+		if (left < 16) {
+			all_zero = 0;
+		} else {
+			all_zero++;
+			for (j = 0; j < 16; j++) {
+				if (m[i + j] != 0) {
+					all_zero = 0;
+					break;
+				}
 			}
 		}
 
 		if (all_zero < 2) {
 			printk(BIOS_DEBUG, "%p:", memory + i);
-			for (j = 0; j < 16; j++)
+			for (j = 0; j < left; j++)
 				printk(BIOS_DEBUG, " %02x", m[i + j]);
+			for (j = left; j < 16; j++)
+				printk(BIOS_DEBUG, "   ");
 			printk(BIOS_DEBUG, "  ");
-			for (j = 0; j < 16; j++)
+			for (j = 0; j < left; j++)
 				printk(BIOS_DEBUG, "%c",
 				       isprint(m[i + j]) ? m[i + j] : '.');
 			printk(BIOS_DEBUG, "\n");