commit 73798eb297e4d4afa2f67d72eb2a3618592a1c4d
author Steven Noonan <steven@uplinklabs.net> Fri Apr 05 16:57:38 2013 -0700
committer Jens Axboe <axboe@kernel.dk> Tue Apr 09 20:00:31 2013 +0200
tree d0b27686827b0446210bbee22352ee81798c5563
parent 7351f402b131fc4ad4e25bd2609a255a1ab4e97c

num2str: add arguments to represent values in terms of bytes/bits

This allows for representing I/O rates in terms of e.g. megabits (Mb) versus
megabytes (MB).

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

lib/num2str.c

diff --git a/lib/num2str.c b/lib/num2str.c
index 559cbeb..a104192 100644
--- a/lib/num2str.c
+++ b/lib/num2str.c
@@ -5,12 +5,13 @@
 /*
  * Cheesy number->string conversion, complete with carry rounding error.
  */
-char *num2str(unsigned long num, int maxlen, int base, int pow2)
+char *num2str(unsigned long num, int maxlen, int base, int pow2, int unit_base)
 {
-	char postfix[] = { ' ', 'K', 'M', 'G', 'P', 'E' };
-	unsigned int thousand[] = { 1000, 1024 };
+	const char *postfix[] = { "", "K", "M", "G", "P", "E" };
+	const char *byte_postfix[] = { "", "B", "bit" };
+	const unsigned int thousand[] = { 1000, 1024 };
 	unsigned int modulo, decimals;
-	int post_index, carry = 0;
+	int byte_post_index = 0, post_index, carry = 0;
 	char tmp[32];
 	char *buf;
 
@@ -19,6 +20,16 @@
 	for (post_index = 0; base > 1; post_index++)
 		base /= thousand[!!pow2];
 
+	switch (unit_base) {
+	case 1:
+		byte_post_index = 2;
+		num *= 8;
+		break;
+	case 8:
+		byte_post_index = 1;
+		break;
+	}
+
 	modulo = -1U;
 	while (post_index < sizeof(postfix)) {
 		sprintf(tmp, "%lu", num);
@@ -33,7 +44,8 @@
 
 	if (modulo == -1U) {
 done:
-		sprintf(buf, "%lu%c", num, postfix[post_index]);
+		sprintf(buf, "%lu%s%s", num, postfix[post_index],
+			byte_postfix[byte_post_index]);
 		return buf;
 	}
 
@@ -53,6 +65,7 @@
 		modulo = (modulo + 9) / 10;
 	} while (1);
 
-	sprintf(buf, "%lu.%u%c", num, modulo, postfix[post_index]);
+	sprintf(buf, "%lu.%u%s%s", num, modulo, postfix[post_index],
+		byte_postfix[byte_post_index]);
 	return buf;
 }