1 files changed, 28 insertions, 0 deletions
diff --git a/src/mcpp-diagnostic.c b/src/mcpp-diagnostic.c
new file mode 100644
index 0000000..76e0c25
--- /dev/null
+++ b/src/mcpp-diagnostic.c
@@ -0,0 +1,28 @@
+#include <defs.h>
+#include <stdarg.h>
+
+int
+mcpp_diagnostic_warning( const mcpp_options *options,
+                         const char *filename,
+                         unsigned line_number,
+                         const char *format, ... )
+{
+  va_list ap;
+  int     as_error;
+
+  if( options != NULL && options->inhibit_warnings )
+    return( 0 );
+
+  as_error = options != NULL && options->warnings_are_errors;
+
+  fprintf( stderr, "%s:%u: %s: ",
+           filename != NULL ? filename : "<input>", line_number,
+           as_error ? "error" : "warning" );
+
+  va_start( ap, format );
+  vfprintf( stderr, format, ap );
+  va_end( ap );
+  fputc( '\n', stderr );
+
+  return( as_error ? -1 : 0 );
+}