util: virqemu: introduce virQEMUBuildBufferEscape

This will eventually replace virQEMUBuildBufferEscapeComma, however
it's not possible right now.  Some parts of the code that uses the
old function needs to be refactored.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

src/libvirt_private.syms

@@ -2298,6 +2298,7 @@ virProcessWait;
 
 
 # util/virqemu.h
+virQEMUBuildBufferEscape;
 virQEMUBuildBufferEscapeComma;
 virQEMUBuildCommandLineJSON;
 virQEMUBuildCommandLineJSONArrayBitmap;

src/util/virqemu.c

@@ -299,6 +299,23 @@ virQEMUBuildBufferEscapeComma(virBufferPtr buf, const char *str)
 }
 
 
+/**
+ * virQEMUBuildBufferEscape:
+ * @buf: buffer to append the escaped string
+ * @str: the string to escape
+ *
+ * Some characters passed as values on the QEMU command line must be escaped.
+ *
+ *  - ',' must by escaped by ','
+ *  - '=' must by escaped by '\'
+ */
+void
+virQEMUBuildBufferEscape(virBufferPtr buf, const char *str)
+{
+    virBufferEscapeN(buf, "%s", str, ',', ",", '\\', "=", NULL);
+}
+
+
 /**
  * virQEMUBuildLuksOpts:
  * @buf: buffer to build the string into

src/util/virqemu.h

@@ -50,6 +50,7 @@ char *virQEMUBuildObjectCommandlineFromJSON(const char *type,
 char *virQEMUBuildDriveCommandlineFromJSON(virJSONValuePtr src);
 
 void virQEMUBuildBufferEscapeComma(virBufferPtr buf, const char *str);
+void virQEMUBuildBufferEscape(virBufferPtr buf, const char *str);
 void virQEMUBuildLuksOpts(virBufferPtr buf,
                           virStorageEncryptionInfoDefPtr enc,
                           const char *alias)