[Qemu-devel] [PATCH 2/7] cutils: Add bytes_to_str() to format byte values

[Stefan Hajnoczi]

From: Anthony Liguori <aligu...@us.ibm.com>

This common function converts byte counts to human-readable strings with
proper units.

Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com>
---
 cutils.c      |   15 +++++++++++++++
 qemu-common.h |    1 +
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/cutils.c b/cutils.c
index f9812d5..76f7501 100644
--- a/cutils.c
+++ b/cutils.c
@@ -277,3 +277,18 @@ int get_bits_from_size(size_t size)
 
     return res;
 }
+
+void bytes_to_str(char *buffer, size_t buffer_len, uint64_t size)
+{
+    if (size < (1ULL << 10)) {
+        snprintf(buffer, buffer_len, "%" PRIu64 " byte(s)", size);
+    } else if (size < (1ULL << 20)) {
+        snprintf(buffer, buffer_len, "%" PRIu64 " KB(s)", size >> 10);
+    } else if (size < (1ULL << 30)) {
+        snprintf(buffer, buffer_len, "%" PRIu64 " MB(s)", size >> 20);
+    } else if (size < (1ULL << 40)) {
+        snprintf(buffer, buffer_len, "%" PRIu64 " GB(s)", size >> 30);
+    } else {
+        snprintf(buffer, buffer_len, "%" PRIu64 " TB(s)", size >> 40);
+    }
+}
diff --git a/qemu-common.h b/qemu-common.h
index 3170c64..e0900b8 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -138,6 +138,7 @@ int qemu_fls(int i);
 int qemu_fdatasync(int fd);
 int fcntl_setfl(int fd, int flag);
 int get_bits_from_size(size_t size);
+void bytes_to_str(char *buffer, size_t buffer_len, uint64_t size);
 
 /* path.c */
 void init_paths(const char *prefix);
-- 
1.7.1