[PATCH 4/6] util: string: Introduce helper to determine whether a byte buffer is printable

[Peter Krempa <pkrempa@xxxxxxxxxx>]

From: John Ferlan <jferlan@xxxxxxxxxx>

Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virstring.c     | 19 +++++++++++++++++++
 src/util/virstring.h     |  1 +
 3 files changed, 21 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ca2b6b8..28c54d6 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2302,6 +2302,7 @@ virSkipSpacesBackwards;
 virStrcpy;
 virStrdup;
 virStringArrayHasString;
+virStringBufferIsPrintable;
 virStringEncodeBase64;
 virStringFreeList;
 virStringFreeListCount;
diff --git a/src/util/virstring.c b/src/util/virstring.c
index 2702cec..0177a95 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -1070,6 +1070,25 @@ virStringIsPrintable(const char *str)


 /**
+ * virBufferIsPrintable:
+ *
+ * Returns true if @buf of @buflen contains only printable characters
+ */
+bool
+virStringBufferIsPrintable(const uint8_t *buf,
+                           size_t buflen)
+{
+    size_t i;
+
+    for (i = 0; i < buflen; i++)
+        if (!c_isprint(buf[i]))
+            return false;
+
+    return true;
+}
+
+
+/**
  * virStringEncodeBase64:
  * @buf: buffer of bytes to encode
  * @buflen: number of bytes to encode
diff --git a/src/util/virstring.h b/src/util/virstring.h
index 6bc2726..040771e 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -276,6 +276,7 @@ bool virStringHasControlChars(const char *str);
 void virStringStripControlChars(char *str);

 bool virStringIsPrintable(const char *str);
+bool virStringBufferIsPrintable(const uint8_t *buf, size_t buflen);

 char *virStringEncodeBase64(const uint8_t *buf, size_t buflen);

-- 
2.8.2

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