Add xfer_[v]printf() functions.

diff --git a/src/core/xfer.c b/src/core/xfer.c
index 54377c7..2250687 100644 (file)
--- a/src/core/xfer.c
+++ b/src/core/xfer.c
@@ -17,6 +17,7 @@
  */
 
 #include <string.h>
+#include <stdio.h>
 #include <errno.h>
 #include <gpxe/xfer.h>
 
@@ -221,6 +222,46 @@ int xfer_deliver_raw ( struct xfer_interface *xfer,
        return rc;
 }
 
+/**
+ * Deliver formatted string
+ *
+ * @v xfer             Data transfer interface
+ * @v format           Format string
+ * @v args             Arguments corresponding to the format string
+ * @ret rc             Return status code
+ */
+int xfer_vprintf ( struct xfer_interface *xfer, const char *format,
+                  va_list args ) {
+       size_t len;
+       va_list args_tmp;
+
+       va_copy ( args_tmp, args );
+       len = vsnprintf ( NULL, 0, format, args );
+       {
+               char buf[len + 1];
+               vsnprintf ( buf, sizeof ( buf ), format, args_tmp );
+               return xfer_deliver_raw ( xfer, buf, len );
+       }
+}
+
+/**
+ * Deliver formatted string
+ *
+ * @v xfer             Data transfer interface
+ * @v format           Format string
+ * @v ...              Arguments corresponding to the format string
+ * @ret rc             Return status code
+ */
+int xfer_printf ( struct xfer_interface *xfer, const char *format, ... ) {
+       va_list args;
+       int rc;
+
+       va_start ( args, format );
+       rc = xfer_vprintf ( xfer, format, args );
+       va_end ( args );
+       return rc;
+}
+
 /****************************************************************************
  *
  * Helper methods

diff --git a/src/include/gpxe/xfer.h b/src/include/gpxe/xfer.h
index e6c896c..f946ab1 100644 (file)
--- a/src/include/gpxe/xfer.h
+++ b/src/include/gpxe/xfer.h
@@ -143,6 +143,10 @@ extern int xfer_deliver_iob ( struct xfer_interface *xfer,
                              struct io_buffer *iobuf );
 extern int xfer_deliver_raw ( struct xfer_interface *xfer,
                              const void *data, size_t len );
+extern int xfer_vprintf ( struct xfer_interface *xfer,
+                         const char *format, va_list args );
+extern int xfer_printf ( struct xfer_interface *xfer,
+                        const char *format, ... );
 
 extern void ignore_xfer_close ( struct xfer_interface *xfer, int rc );
 extern int ignore_xfer_vredirect ( struct xfer_interface *xfer,