The great merge

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4141 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/python/varargs/example.i

@@ -0,0 +1,65 @@
+/* File : example.i */
+%module example
+
+%{
+#include <stdarg.h>
+%}
+
+/* This example illustrates SWIG's handling of varargs functions.  
+   By default, variable length arguments are simply ignored.  This
+   is generally appropriate for wrapping I/O functions like printf.
+   You can simply format a string in the scripting language, and
+   pass it directly */
+
+int printf(const char *fmt, ...);
+
+/* Since passing a format string might be dangerous.  Here is a slightly
+   different way of wrapping a printf style function */
+
+#if 1
+/* Replace ... with char *.   */
+%varargs(char *) fprintf;
+
+/* Ignore the format string, but set it to %s */
+%typemap(ignore) const char *fmt {
+	$1 = "%s";
+}
+#else
+/* An alternative approach using typemaps */
+%typemap(in) (const char *fmt, ...) {
+   $1 = "%s";
+   $2 = (void *) PyString_AsString($input);
+}
+#endif
+
+/* Typemap just to make the example work */
+%typemap(in) FILE * "$1 = PyFile_AsFile($input);";
+
+int fprintf(FILE *, const char *fmt, ...);
+
+/* Here is somewhat different example.  A variable length argument
+   function that takes a NULL-terminated list of arguments. We
+   can use a slightly different form of %varargs that specifies
+   a default value and a maximum number of arguments.
+ */
+
+/* Maximum of 20 arguments with default value NULL */
+
+%varargs(20, char *x = NULL) printv;
+
+%inline %{
+void printv(char *s, ...) {
+    va_list ap;
+    char *x;
+    fputs(s,stdout);
+    fputc(' ',stdout);
+    va_start(ap, s);
+    while ((x = va_arg(ap, char *))) {
+      fputs(x,stdout);
+      fputc(' ',stdout);
+    }
+    va_end(ap);
+    fputc('\n',stdout);
+}
+%}
+