Introduce a new %pB format specifier to print sizes (in bytes) in a
human-readable form.
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
Cc: Andrew Cooper <andrew.coop...@citrix.com>
Cc: George Dunlap <george.dun...@eu.citrix.com>
Cc: Ian Jackson <ian.jack...@eu.citrix.com>
Cc: Jan Beulich <jbeul...@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Cc: Stefano Stabellini <sstabell...@kernel.org>
Cc: Tim Deegan <t...@xen.org>
Cc: Wei Liu <wei.l...@citrix.com>
---
docs/misc/printk-formats.txt | 5 +++++
xen/common/vsprintf.c | 15 +++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/docs/misc/printk-formats.txt b/docs/misc/printk-formats.txt
index 525108f..0ee3504 100644
--- a/docs/misc/printk-formats.txt
+++ b/docs/misc/printk-formats.txt
@@ -30,3 +30,8 @@ Domain and vCPU information:
%pv Domain and vCPU ID from a 'struct vcpu *' (printed as
"d<domid>v<vcpuid>")
+
+Size in human readable form:
+
+ %pZ Size in human-readable form (input size must be in bytes).
+ e.g. 24MB
diff --git a/xen/common/vsprintf.c b/xen/common/vsprintf.c
index f92fb67..2dadaec 100644
--- a/xen/common/vsprintf.c
+++ b/xen/common/vsprintf.c
@@ -386,6 +386,21 @@ static char *pointer(char *str, char *end, const char
**fmt_ptr,
*str = 'v';
return number(str + 1, end, v->vcpu_id, 10, -1, -1, 0);
}
+ case 'Z':
+ {
+ static const char units[][3] = {"B", "KB", "MB", "GB", "TB"};
+ size_t size = (size_t)arg;
+ int i = 0;
+
+ /* Advance parents fmt string, as we have consumed 'B' */
+ ++*fmt_ptr;
+
+ while ( ++i < sizeof(units) && size >= 1024 )
+ size >>= 10; /* size /= 1024 */
+
+ str = number(str, end, size, 10, -1, -1, 0);
+ return string(str, end, units[i-1], -1, -1, 0);
+ }
}
if ( field_width == -1 )
--
2.7.4 (Apple Git-66)
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
