[PATCH 1/2] mtd-utils: common.c: convert to integer arithmetic

[Andrea Adami]

We use floating point just to print out KiB, MiB, GiB.
Avoid that to be klibc friendly.

Fixes compilation for aarch64 against klibc:

error: '-mgeneral-regs-only' is incompatible with floating-point argument
|    printf("%s%.1f GiB", p, (double)bytes / (1024 * 1024 * 1024));
etc.

Note:
* In the KiB case, we could apparently multiply by 100 before dividing
  without risking overflow. This code simply avoids multiplications.

Signed-off-by: Andrea Adami <andrea.adami at gmail.com>
---
 lib/common.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/common.c b/lib/common.c
index 69b03b3..5e28853 100644
--- a/lib/common.c
+++ b/lib/common.c
@@ -107,6 +107,9 @@ long long util_get_bytes(const char *str)
 void util_print_bytes(long long bytes, int bracket)
 {
 	const char *p;
+	int GiB = 1024 * 1024 * 1024;
+	int MiB = 1024 * 1024;
+	int KiB = 1024;
 
 	if (bracket)
 		p = " (";
@@ -115,12 +118,12 @@ void util_print_bytes(long long bytes, int bracket)
 
 	printf("%lld bytes", bytes);
 
-	if (bytes > 1024 * 1024 * 1024)
-		printf("%s%.1f GiB", p, (double)bytes / (1024 * 1024 * 1024));
-	else if (bytes > 1024 * 1024)
-		printf("%s%.1f MiB", p, (double)bytes / (1024 * 1024));
-	else if (bytes > 1024 && bytes != 0)
-		printf("%s%.1f KiB", p, (double)bytes / 1024);
+	if (bytes > GiB)
+		printf("%s%d.%d GiB", p, bytes / GiB, bytes % GiB / (GiB / 10));
+	else if (bytes > MiB)
+		printf("%s%d.%d MiB", p, bytes / MiB, bytes % MiB / (MiB / 10));
+	else if (bytes > KiB && bytes != 0)
+		printf("%s%d.%d KiB", p, bytes / KiB, bytes % KiB / (KiB / 10));
 	else
 		return;
 
-- 
2.7.4