[PATCH 2/2] utils.c: offer to limit divisions in pretty_sizes

[Pierre Carrier <pierre@spotify.com>]

Dirty hack to allow inspection of sizes in lower units.

Useful to know the minimum size a partition shoud be resized to
after a 'btrfs filesystem resize'.

Label: 'home'  uuid: 10453c4c-1c5b-4df5-b4a5-43a7f377430a
        Total devices 1 FS bytes used 42.80GB
        devid    1 size 62.16GB used 62.16GB path /dev/sda5

Label: 'home'  uuid: 10453c4c-1c5b-4df5-b4a5-43a7f377430a
        Total devices 1 FS bytes used 44884524.00KB
        devid    1 size 65182236.00KB used 65182208.00KB path /dev/sda5

Signed-off-by: Pierre Carrier <pierre@spotify.com>

diff --git a/utils.c b/utils.c
index 937e763..3f0b7e7 100644
--- a/utils.c
+++ b/utils.c
@@ -1096,13 +1096,18 @@ static char *size_strs[] = { "", "KB", "MB", "GB", "TB",
 char *pretty_sizes(u64 size)
 {
 	int num_divs = 0;
+	int max_divs = INT_MAX;
         int pretty_len = 16;
 	u64 last_size = size;
 	u64 fract_size = size;
 	float fraction;
 	char *pretty;
+	char *max_divs_s;
 
-	while(size > 0) {
+	if (max_divs_s = getenv("MAX_DIVS"))
+		max_divs = atoi(max_divs_s);
+
+	while(size > 0 && num_divs <= max_divs) {
 		fract_size = last_size;
 		last_size = size;
 		size /= 1024;
@@ -1117,7 +1122,6 @@ char *pretty_sizes(u64 size)
 	if (num_divs > ARRAY_SIZE(size_strs))
 		return NULL;
 
-
 	pretty = malloc(pretty_len);
 	if (!pretty)
 		return NULL;
-- 
1.7.11.1