From 0b7593e085e66c7f5ab980a1ed8ee683c36b7347 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Sat, 8 Feb 2014 11:01:50 +0100
Subject: qapi: Add human mode to StringOutputVisitor
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This will be used by "info qtree".  For numbers it prints both the
decimal and hex values.  For sizes it rounds to the nearest power
of 2^10.  For strings, it puts quotes around the string and separates
NULL and empty string.

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 qapi/string-output-visitor.c | 55 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 52 insertions(+), 3 deletions(-)

(limited to 'qapi')

diff --git a/qapi/string-output-visitor.c b/qapi/string-output-visitor.c
index 921653d425..67a8798292 100644
--- a/qapi/string-output-visitor.c
+++ b/qapi/string-output-visitor.c
@@ -14,10 +14,12 @@
 #include "qapi/string-output-visitor.h"
 #include "qapi/visitor-impl.h"
 #include "qapi/qmp/qerror.h"
+#include "qemu/host-utils.h"
 
 struct StringOutputVisitor
 {
     Visitor visitor;
+    bool human;
     char *string;
 };
 
@@ -31,7 +33,45 @@ static void print_type_int(Visitor *v, int64_t *obj, const char *name,
                            Error **errp)
 {
     StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
-    string_output_set(sov, g_strdup_printf("%lld", (long long) *obj));
+    char *out;
+
+    if (sov->human) {
+        out = g_strdup_printf("%lld (%#llx)", (long long) *obj, (long long) *obj);
+    } else {
+        out = g_strdup_printf("%lld", (long long) *obj);
+    }
+    string_output_set(sov, out);
+}
+
+static void print_type_size(Visitor *v, uint64_t *obj, const char *name,
+                           Error **errp)
+{
+    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    static const char suffixes[] = { 'B', 'K', 'M', 'G', 'T' };
+    uint64_t div, val;
+    char *out;
+    int i;
+
+    if (!sov->human) {
+        out = g_strdup_printf("%llu", (long long) *obj);
+        string_output_set(sov, out);
+        return;
+    }
+
+    val = *obj;
+
+    /* Compute floor(log2(val)).  */
+    i = 64 - clz64(val);
+
+    /* Find the power of 1024 that we'll display as the units.  */
+    i /= 10;
+    if (i >= ARRAY_SIZE(suffixes)) {
+        i = ARRAY_SIZE(suffixes) - 1;
+    }
+    div = 1ULL << (i * 10);
+
+    out = g_strdup_printf("%0.03f%c", (double)val/div, suffixes[i]);
+    string_output_set(sov, out);
 }
 
 static void print_type_bool(Visitor *v, bool *obj, const char *name,
@@ -45,7 +85,14 @@ static void print_type_str(Visitor *v, char **obj, const char *name,
                            Error **errp)
 {
     StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
-    string_output_set(sov, g_strdup(*obj ? *obj : ""));
+    char *out;
+
+    if (sov->human) {
+        out = *obj ? g_strdup_printf("\"%s\"", *obj) : g_strdup("<null>");
+    } else {
+        out = g_strdup(*obj ? *obj : "");
+    }
+    string_output_set(sov, out);
 }
 
 static void print_type_number(Visitor *v, double *obj, const char *name,
@@ -73,14 +120,16 @@ void string_output_visitor_cleanup(StringOutputVisitor *sov)
     g_free(sov);
 }
 
-StringOutputVisitor *string_output_visitor_new(void)
+StringOutputVisitor *string_output_visitor_new(bool human)
 {
     StringOutputVisitor *v;
 
     v = g_malloc0(sizeof(*v));
 
+    v->human = human;
     v->visitor.type_enum = output_type_enum;
     v->visitor.type_int = print_type_int;
+    v->visitor.type_size = print_type_size;
     v->visitor.type_bool = print_type_bool;
     v->visitor.type_str = print_type_str;
     v->visitor.type_number = print_type_number;
-- 
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