util: string: Introduce helper to determine whether a byte buffer is printable

Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/libvirt_private.syms

@@ -2303,6 +2303,7 @@ virSkipSpacesBackwards;
 virStrcpy;
 virStrdup;
 virStringArrayHasString;
+virStringBufferIsPrintable;
 virStringEncodeBase64;
 virStringFreeList;
 virStringFreeListCount;

src/util/virstring.c

@@ -1069,6 +1069,25 @@ 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

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);