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#include <stdarg.h>
#include <string.h>
#include <SWI-Prolog.h>

int
Pl(char *szMod, char *szPred, char *szFmt, ...)
{
	int i, iArity;
	term_t t;
	va_list vl;

	va_start(vl, szFmt);
	iArity = strlen(szFmt);
	t = PL_new_term_refs(iArity);

	for (i = 0; szFmt[i]; i++) {
		switch (szFmt[i]) {
		case 'I':
		    {
			int x;
			x = va_arg(vl, int);
			if (!PL_put_integer(t+i, x)) return 0;
			break;
		    }
		case 'A':
		    {
			atom_t x;
			x = va_arg(vl, atom_t);
			if (!PL_put_atom(t+i, x)) return 0;
			break;
		    }
		case 'S':
		    {
			atom_t a;
			char *x;
			x = va_arg(vl, char *);
			a = PL_new_atom(x);
			if (!PL_put_atom(t+i, a)) return 0;
			break;
		    }
		}
	}

	if (!PL_call_predicate(NULL, PL_Q_NORMAL,
		PL_predicate(szPred, iArity, szMod), t))
		return 0;

	for (i = 0; szFmt[i]; i++) {
		switch (szFmt[i]) {
		case 'i':
		    {
			int *lp;
			lp = va_arg(vl, int *);
			if (!PL_get_integer(t+i, lp)) return 0;
			break;
		    }
		case 'a':
		    {
			atom_t *lp;
			lp = va_arg(vl, atom_t *);
			if (!PL_get_atom(t+i, lp)) return 0;
			break;
		    }
		case 's':
		    {
			char **lp;
			lp = va_arg(vl, char **);
			if (!PL_get_atom_chars(t+i, lp)) return 0;
			break;
		    }
		}
	}

	va_end(vl);
	return 1;
}