[Libvir] XML escaping patch

[Richard W.M. Jones]

Daniel Veillard wrote:
[...]
>  /**
> + * virBufferEscapeString:
> + * @buf:  the buffer to dump
> + * @format: a printf like format string but with only one %s parameter
> + * @str:  the string argument which need to be escaped
> + *
> + * Do a formatted print with a single string to an XML buffer. The string
> + * is escaped to avoid generating a not well-formed XML instance.
> + *
> + * Returns 0 successful, -1 in case of internal or API error.
> + */
> +int
> +virBufferEscapeString(virBufferPtr buf, const char *format, const char *str)

I spent a bit of time pondering if it would be possible to either make 
this call type-safe, or else handle arbitrary format strings.  I'm not 
sure I can see a good way to do either, so in the meantime, +1.

Rich.

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