[PATCH v4 1/3] util: Add virFileReadValueUllongQuiet

[Yang Fei]

Use function virFileReadValueUllongQuiet to read unsigned long
long value without error report.

Signed-off-by: Yang Fei <yangfei85 at huawei.com>
---
 src/libvirt_private.syms |  1 +
 src/util/virfile.c       | 24 ++++++++++++++++++++++++
 src/util/virfile.h       |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 4bc2974e7f..5429a82a7c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2242,6 +2242,7 @@ virFileReadValueScaledInt;
 virFileReadValueString;
 virFileReadValueUint;
 virFileReadValueUllong;
+virFileReadValueUllongQuiet;
 virFileRelLinkPointsTo;
 virFileRemove;
 virFileRemoveLastComponent;
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 723e1ca6e5..70737f4751 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -4065,6 +4065,30 @@ virFileReadValueUllong(unsigned long long *value, const char *format, ...)
     return 0;
 }
 
+int
+virFileReadValueUllongQuiet(unsigned long long *value, const char *format, ...)
+{
+    g_autofree char *str = NULL;
+    g_autofree char *path = NULL;
+    va_list ap;
+
+    va_start(ap, format);
+    path = g_strdup_vprintf(format, ap);
+    va_end(ap);
+
+    if (!virFileExists(path))
+        return -2;
+
+    if (virFileReadAllQuiet(path, VIR_INT64_STR_BUFLEN, &str) < 0)
+        return -1;
+
+    virStringTrimOptionalNewline(str);
+
+    if (virStrToLong_ullp(str, NULL, 10, value) < 0)
+        return -1;
+
+    return 0;
+}
 
 /**
  * virFileReadValueScaledInt:
diff --git a/src/util/virfile.h b/src/util/virfile.h
index 72368495bf..967c9a9b4f 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -339,6 +339,8 @@ int virFileReadValueUint(unsigned int *value, const char *format, ...)
  G_GNUC_PRINTF(2, 3);
 int virFileReadValueUllong(unsigned long long *value, const char *format, ...)
  G_GNUC_PRINTF(2, 3);
+int virFileReadValueUllongQuiet(unsigned long long *value, const char *format, ...)
+ G_GNUC_PRINTF(2, 3);
 int virFileReadValueBitmap(virBitmap **value, const char *format, ...)
  G_GNUC_PRINTF(2, 3);
 int virFileReadValueScaledInt(unsigned long long *value, const char *format, ...)
-- 
2.23.0