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[tests] add run_on_default_source helper

--- a/tests/utils_tests.h

+++ b/tests/utils_tests.h

@@ -20,6 +20,10 @@

 #define PATH_MAX 1024

 #endif

+#ifndef AUBIO_TESTS_SOURCE

+#error "AUBIO_TESTS_SOURCE is not defined"

+#endif

+

 #ifdef HAVE_C99_VARARGS_MACROS

 #define PRINT_ERR(...)   fprintf(stderr, "AUBIO-TESTS ERROR: " __VA_ARGS__)

 #define PRINT_MSG(...)   fprintf(stdout, __VA_ARGS__)

@@ -71,6 +75,11 @@

 // create_temp_sink / close_temp_sink

 #if defined(__GNUC__) // mkstemp

+int check_source(char *source_path)

+{

+  return access(source_path, R_OK);

+}

+

 int create_temp_sink(char *sink_path)

 {

   return mkstemp(sink_path);

@@ -86,6 +95,12 @@

 #elif defined(HAVE_WIN_HACKS) //&& !defined(__GNUC__)

 // windows workaround, where mkstemp does not exist...

+

+int check_source(char *source_path)

+{

+  return _access(source_path, 04);

+}

+

 int create_temp_sink(char *templ)

 {

   int i = 0;

@@ -112,6 +127,20 @@

 #error "mkstemp undefined, but not on windows. additional workaround required."

 #endif

+// pass progname / default

+int run_on_default_source( int main(int, char**) )

+{

+  const int argc = 2;

+  int err = 0;

+  char** argv = (char**)calloc(argc, sizeof(char*));

+  argv[0] = __FILE__;

+  argv[1] = AUBIO_TESTS_SOURCE;

+  // check if the file can be read

+  if ( check_source(argv[1]) ) return 1;

+  err = main(argc, argv);

+  if (argv) free(argv);

+  return err;

+}

 int run_on_default_sink( int main(int, char**) )

 {