xen: introduce xenbus_read_unsigned()
There are multiple instances of code reading an optional unsigned parameter from Xenstore via xenbus_scanf(). Instead of repeating the same code over and over add a service function doing the job. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
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@ -559,6 +559,21 @@ int xenbus_scanf(struct xenbus_transaction t,
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}
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EXPORT_SYMBOL_GPL(xenbus_scanf);
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/* Read an (optional) unsigned value. */
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unsigned int xenbus_read_unsigned(const char *dir, const char *node,
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unsigned int default_val)
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{
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unsigned int val;
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int ret;
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ret = xenbus_scanf(XBT_NIL, dir, node, "%u", &val);
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if (ret <= 0)
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val = default_val;
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return val;
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}
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EXPORT_SYMBOL_GPL(xenbus_read_unsigned);
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/* Single printf and write: returns -errno or 0. */
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int xenbus_printf(struct xenbus_transaction t,
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const char *dir, const char *node, const char *fmt, ...)
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@ -151,6 +151,10 @@ __scanf(4, 5)
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int xenbus_scanf(struct xenbus_transaction t,
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const char *dir, const char *node, const char *fmt, ...);
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/* Read an (optional) unsigned value. */
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unsigned int xenbus_read_unsigned(const char *dir, const char *node,
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unsigned int default_val);
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/* Single printf and write: returns -errno or 0. */
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__printf(4, 5)
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int xenbus_printf(struct xenbus_transaction t,
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