rtapi: stop exporting the vsnprintf implementation

rtapi_vsnprintf.h is 475 lines of implementation, not an interface, and the
only code that includes it is rtai_rtapi.c beside it and the unit test. The
documented entry point, rtapi_vsnprintf(), is declared in rtapi.h and stays
exported, so nothing an out-of-tree component may legitimately call moves.

The header goes to rtapi/ and rtai_rtapi.c takes it from its own directory.
The three exported headers it pulls in go angled, since they are no longer
beside it.

tests/rtapi_printf.0 compiles the header, so it now needs the source tree and
is skipped on installed packages, the same way tests/blendmath already is.

Author: grandixximo

src/rtapi/rtai_rtapi.c

@@ -73,7 +73,7 @@
 
 #include <linux/cpumask.h>	/* NR_CPUS, cpu_online() */
 
-#include <rtapi_vsnprintf.h>
+#include "rtapi_vsnprintf.h"
 
 #include <rtai.h>
 #include <rtai_sched.h>

include/rtapi_vsnprintf.h src/rtapi/rtapi_vsnprintf.hinclude/rtapi_vsnprintf.h renamed to src/rtapi/rtapi_vsnprintf.h

@@ -38,9 +38,9 @@ values (or floating point).
 
 #include <stdarg.h>
 #include <stddef.h>
-#include "rtapi_ctype.h"
-#include "rtapi_math.h"
-#include "rtapi_string.h"
+#include <rtapi_ctype.h>
+#include <rtapi_math.h>
+#include <rtapi_string.h>
 
 /* we use this so that we can do without the string library */
 static int strn_len(const char *s, int count)

tests/rtapi_printf.0/skip

@@ -0,0 +1,4 @@
+#!/bin/sh
+# This test compiles rtapi_vsnprintf.h from the source tree, which is only
+# available in run-in-place builds. Skip when testing installed packages.
+[ -z "$SYSTEM_BUILD" ]

tests/rtapi_printf.0/test.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -xe
 
-g++ -DULAPI -I"${HEADERS}" -std=c++0x \
+g++ -DULAPI -I"${EMC2_HOME}/src/rtapi" -I"${HEADERS}" -std=c++0x \
     -DSIM -rdynamic -L"${LIBDIR}" \
     -o test_rtapi_vsnprintf test_rtapi_vsnprintf.c
 ./test_rtapi_vsnprintf