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diff --git a/tests/tap/string.h b/tests/tap/string.h
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+++ b/tests/tap/string.h
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+/*
+ * String utilities for the TAP protocol.
+ *
+ * Additional string utilities that can't be included with C TAP Harness
+ * because they rely on additional portability code from rra-c-util.
+ *
+ * The canonical version of this file is maintained in the rra-c-util package,
+ * which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
+ *
+ * Copyright 2011, 2012 Russ Allbery <rra@stanford.edu>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef TAP_STRING_H
+#define TAP_STRING_H 1
+
+#include <config.h>
+#include <tests/tap/macros.h>
+
+#include <stdarg.h>             /* va_list */
+
+BEGIN_DECLS
+
+/* sprintf into an allocated string, calling bail on any failure. */
+void basprintf(char **, const char *, ...)
+    __attribute__((__nonnull__, __format__(printf, 2, 3)));
+void bvasprintf(char **, const char *, va_list)
+    __attribute__((__nonnull__));
+
+END_DECLS
+
+#endif /* !TAP_STRING_H */