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#include <stdarg.h>
#include <string.h>
#include <SWI-Prolog.h>
#include "defs.h"
static int Plpv(term_t, char *, va_list);
static int Plgv(term_t, char *, va_list);
/* Call Prolog predicate once. */
int
Pl(char *szMod, char *szPred, char *szFmt, ...)
{
int iArity;
term_t t;
va_list vl, vl2;
iArity = strlen(szFmt);
t = PL_new_term_refs(iArity);
va_start(vl, szFmt);
va_copy(vl2, vl);
if (!Plpv(t, szFmt, vl)) goto f;
if (!PL_call_predicate(NULL, PL_Q_NORMAL,
PL_predicate(szPred, iArity, szMod), t))
goto f;
if (!Plgv(t, szFmt, vl2)) goto f;
va_end(vl);
va_end(vl2);
return 1;
f: va_end(vl);
va_end(vl2);
return 0;
}
/* Put known values in term. */
int
Plp(term_t t, char *szFmt, ...)
{
int r;
va_list vl;
va_start(vl, szFmt);
r = Plpv(t, szFmt, vl);
va_end(vl);
return r;
}
int
Plpv(term_t t, char *szFmt, va_list vl)
{
int i;
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;
}
case 'i':
va_arg(vl, int *);
break;
case 'a':
va_arg(vl, atom_t *);
break;
case 's':
va_arg(vl, char **);
break;
}
}
return 1;
}
/* Get unknown values from term. */
int
Plg(term_t t, char *szFmt, ...)
{
int r;
va_list vl;
va_start(vl, szFmt);
r = Plgv(t, szFmt, vl);
va_end(vl);
return r;
}
int
Plgv(term_t t, char *szFmt, va_list vl)
{
int i;
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;
}
case 'I':
va_arg(vl, int);
break;
case 'A':
va_arg(vl, atom_t);
break;
case 'S':
va_arg(vl, char *);
break;
}
}
return 1;
}
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