Implement untested string and path helpers for easy cross compatability

src/bstr.h

@@ -0,0 +1,12 @@
+#ifndef _BSTR_H_
+#define _BSTR_H_
+
+#include <stdarg.h>
+#include <stdio.h>
+
+/* printf onto the end of base, reallocating and returning that buffer
+ * can provide NULL for no base */
+__attribute__((format(printf, 2, 3)))
+char *bstr_print(char *base, const char *fmt, ...);
+
+#endif /* _BSTR_H_ */