/* 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(in,numinputs=0) const char *fmt {
$1 = "%s";
}
#else
/* An alternative approach using typemaps */
%typemap(in) (const char *fmt, ...) {
$1 = "%s";
$2 = (void *) PyString_AsString($input);
}
#endif
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 %{
/* In Python 2 we could use PyFile_AsFile for converting Python sys.stdout to C's stdout.
This API disappeared in Python 3, so instead we use a helper function to get stdout */
FILE * stdout_stream(void) {
return stdout;
}
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);
}
%}
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