/*-------------------------------------------------------------------------*
* PL_GET_PRED_INDICATOR *
* *
* returns the functor and initializes the arity of the predicate indicator*
* func= -1 if it is a variable, arity= -1 if it is a variable *
*-------------------------------------------------------------------------*/
int
Pl_Get_Pred_Indicator(WamWord pred_indic_word, Bool must_be_ground, int *arity)
{
WamWord word, tag_mask;
int func;
DEREF(pred_indic_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK && must_be_ground)
Pl_Err_Instantiation();
if (!Pl_Get_Structure(ATOM_CHAR('/'), 2, pred_indic_word))
{
if (!Flag_Value(FLAG_STRICT_ISO) &&
Pl_Rd_Callable(word, &func, arity) != NULL)
return func;
Pl_Err_Type(pl_type_predicate_indicator, pred_indic_word);
}
pl_pi_name_word = Pl_Unify_Variable();
pl_pi_arity_word = Pl_Unify_Variable();
if (must_be_ground)
func = Pl_Rd_Atom_Check(pl_pi_name_word);
else
{
DEREF(pl_pi_name_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK)
func = -1;
else
func = Pl_Rd_Atom_Check(pl_pi_name_word);
}
if (must_be_ground)
{
*arity = Pl_Rd_Positive_Check(pl_pi_arity_word);
if (*arity > MAX_ARITY)
Pl_Err_Representation(pl_representation_max_arity);
}
else
{
DEREF(pl_pi_arity_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK)
*arity = -1;
else
{
*arity = Pl_Rd_Positive_Check(pl_pi_arity_word);
if (*arity > MAX_ARITY)
Pl_Err_Representation(pl_representation_max_arity);
}
}
return func;
}
/*-------------------------------------------------------------------------*
* BOUND_VAR *
* *
*-------------------------------------------------------------------------*/
static void
Bound_Var(WamWord *adr)
{
long *p;
for (p = pl_glob_dico_var; p < bound_var_ptr; p++)
if (*p == (long) adr)
return;
if (bound_var_ptr - pl_glob_dico_var >= MAX_VAR_IN_TERM)
Pl_Err_Representation(pl_representation_too_many_variables);
*bound_var_ptr++ = (long) adr;
}
/*-------------------------------------------------------------------------*
* COLLECT_VARIABLE *
* *
*-------------------------------------------------------------------------*/
static Bool
Collect_Variable(WamWord *adr)
{
PlLong *p;
for (p = pl_glob_dico_var; p < var_ptr; p++)
if (*p == (PlLong) adr) /* already present */
return TRUE;
if (var_ptr - pl_glob_dico_var >= MAX_VAR_IN_TERM)
Pl_Err_Representation(pl_representation_too_many_variables);
*var_ptr++ = (PlLong) adr;
return TRUE;
}
/*-------------------------------------------------------------------------*
* LINK_KEY_VAR *
* *
*-------------------------------------------------------------------------*/
static void
Link_Key_Var(WamWord *adr)
{
long *p;
for (p = pl_glob_dico_var; p < key_var_ptr; p++)
if (*p == (long) adr)
return;
if (next_key_var_ptr < save_key_var_ptr)
{ /* same as Pl_Unify(Tag_REF(adr), *next_key_var_ptr++) */
*adr = *(WamWord *) (*next_key_var_ptr);
next_key_var_ptr++;
return;
}
if (key_var_ptr - pl_glob_dico_var >= MAX_VAR_IN_TERM)
Pl_Err_Representation(pl_representation_too_many_variables);
*key_var_ptr++ = (long) adr;
}
/*-------------------------------------------------------------------------*
* PL_BLT_UNIV *
* *
*-------------------------------------------------------------------------*/
Bool FC
Pl_Blt_Univ(WamWord term_word, WamWord list_word)
{
WamWord word, tag_mask;
WamWord *adr;
WamWord car_word;
int lst_length;
WamWord *arg1_adr;
WamWord *term_adr, *lst_adr, *stc_adr;
WamWord functor_word, functor_tag;
int functor;
int arity;
Pl_Set_C_Bip_Name("=..", 2);
DEREF(term_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK)
goto list_to_term;
/* from term to list functor+args */
if (tag_mask == TAG_LST_MASK)
{
adr = UnTag_LST(word);
car_word = Tag_ATM(ATOM_CHAR('.'));
lst_length = 1 + 2;
arg1_adr = &Car(adr);
}
else if (tag_mask == TAG_STC_MASK)
{
adr = UnTag_STC(word);
car_word = Tag_ATM(Functor(adr));
lst_length = 1 + Arity(adr);
arg1_adr = &Arg(adr, 0);
}
#ifndef NO_USE_FD_SOLVER
else if (tag_mask == TAG_FDV_MASK)
{
adr = UnTag_FDV(word);
car_word = Tag_REF(adr); /* since Dont_Separate_Tag */
lst_length = 1 + 0;
}
#endif
else /* TAG_ATM/INT/FLT_MASK */
{
car_word = word;
lst_length = 1 + 0;
}
Pl_Check_For_Un_List(list_word);
Pl_Unset_C_Bip_Name();
for (;;)
{
if (!Pl_Get_List(list_word) || !Pl_Unify_Value(car_word))
return FALSE;
list_word = Pl_Unify_Variable();
if (--lst_length == 0)
break;
car_word = *arg1_adr++;
}
return Pl_Get_Nil(list_word);
/* from list functor+args to term */
list_to_term:
term_adr = UnTag_REF(word);
DEREF(list_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK)
Pl_Err_Instantiation();
if (word == NIL_WORD)
Pl_Err_Domain(pl_domain_non_empty_list, list_word);
if (tag_mask != TAG_LST_MASK)
Pl_Err_Type(pl_type_list, list_word);
lst_adr = UnTag_LST(word);
DEREF(Car(lst_adr), functor_word, functor_tag);
if (functor_tag == TAG_REF_MASK)
Pl_Err_Instantiation();
DEREF(Cdr(lst_adr), word, tag_mask);
if (word == NIL_WORD)
{
if (functor_tag != TAG_ATM_MASK && functor_tag != TAG_INT_MASK &&
functor_tag != TAG_FLT_MASK)
Pl_Err_Type(pl_type_atomic, functor_word);
term_word = functor_word;
goto finish;
}
if (functor_tag != TAG_ATM_MASK)
Pl_Err_Type(pl_type_atom, functor_word);
if (tag_mask == TAG_REF_MASK)
Pl_Err_Instantiation();
if (tag_mask != TAG_LST_MASK)
Pl_Err_Type(pl_type_list, list_word);
functor = UnTag_ATM(functor_word);
stc_adr = H;
H++; /* space for f/n maybe lost if a list */
arity = 0;
for (;;)
{
arity++;
lst_adr = UnTag_LST(word);
DEREF(Car(lst_adr), word, tag_mask);
Do_Copy_Of_Word(tag_mask, word); /* since Dont_Separate_Tag */
Global_Push(word);
DEREF(Cdr(lst_adr), word, tag_mask);
if (word == NIL_WORD)
break;
if (tag_mask == TAG_REF_MASK)
Pl_Err_Instantiation();
if (tag_mask != TAG_LST_MASK)
Pl_Err_Type(pl_type_list, list_word);
}
if (arity > MAX_ARITY)
Pl_Err_Representation(pl_representation_max_arity);
if (functor == ATOM_CHAR('.') && arity == 2) /* a list */
term_word = Tag_LST(stc_adr + 1);
else
{
*stc_adr = Functor_Arity(functor, arity);
term_word = Tag_STC(stc_adr);
}
finish:
Bind_UV(term_adr, term_word);
Pl_Unset_C_Bip_Name();
return TRUE;
}
/*-------------------------------------------------------------------------*
* PL_BLT_FUNCTOR *
* *
*-------------------------------------------------------------------------*/
Bool FC
Pl_Blt_Functor(WamWord term_word, WamWord functor_word, WamWord arity_word)
{
WamWord word, tag_mask;
WamWord *adr;
WamWord tag_functor;
int arity;
Bool res;
Pl_Set_C_Bip_Name("functor", 3);
DEREF(term_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK)
{
if (tag_mask == TAG_LST_MASK)
res = Pl_Un_Atom_Check(ATOM_CHAR('.'), functor_word) &&
Pl_Un_Integer_Check(2, arity_word);
else if (tag_mask == TAG_STC_MASK)
{
adr = UnTag_STC(word);
res = Pl_Un_Atom_Check(Functor(adr), functor_word) &&
Pl_Un_Integer_Check(Arity(adr), arity_word);
}
else
res = Pl_Unify(word, functor_word) && Pl_Un_Integer_Check(0, arity_word);
goto finish;
}
/* tag_mask == TAG_REF_MASK */
DEREF(functor_word, word, tag_mask);
if (tag_mask == TAG_REF_MASK)
Pl_Err_Instantiation();
if (tag_mask != TAG_ATM_MASK && tag_mask != TAG_INT_MASK &&
tag_mask != TAG_FLT_MASK)
Pl_Err_Type(pl_type_atomic, functor_word);
tag_functor = tag_mask;
functor_word = word;
arity = Pl_Rd_Positive_Check(arity_word);
if (arity > MAX_ARITY)
Pl_Err_Representation(pl_representation_max_arity);
if (tag_functor == TAG_ATM_MASK && UnTag_ATM(functor_word) == ATOM_CHAR('.')
&& arity == 2)
{
res = (Pl_Get_List(term_word)) ? Pl_Unify_Void(2), TRUE : FALSE;
goto finish;
}
if (tag_functor == TAG_ATM_MASK && arity > 0)
{
res = (Pl_Get_Structure(UnTag_ATM(functor_word), arity, term_word)) ?
Pl_Unify_Void(arity), TRUE : FALSE;
goto finish;
}
if (arity != 0)
Pl_Err_Type(pl_type_atom, functor_word);
res = Pl_Unify(functor_word, term_word);
finish:
Pl_Unset_C_Bip_Name();
return res;
}
/*-------------------------------------------------------------------------*
* FORMAT *
* *
*-------------------------------------------------------------------------*/
static void
Format(StmInf *pstm, char *format, WamWord *lst_adr)
#define IMPOSS -12345678
{
WamWord word;
Bool has_n;
long generic;
long n, n1;
char *p;
long x;
double d;
int lg, stop;
int i, k;
char *format_stack[256];
char **top_stack = format_stack;
char buff[2048];
*top_stack++ = format;
do
{
format = *--top_stack;
while (*format)
{
if (*format == '%') /* C printf format */
{
if (format[1] == '%')
{
Pl_Stream_Putc('%', pstm);
format += 2;
continue;
}
p = buff;
n = n1 = IMPOSS;
do
if ((*p++ = *format++) == '*')
{
if (n == IMPOSS)
n = Arg_Integer(&lst_adr);
else
n1 = Arg_Integer(&lst_adr);
}
while ((char *) strchr("diouxXpnceEfgGs", p[-1]) == NULL);
*p = '\0';
if (strchr("eEfgG", p[-1]) == NULL)
{
generic = (p[-1] == 's') ? (long) Arg_Atom(&lst_adr)
: Arg_Integer(&lst_adr);
if (n != IMPOSS)
{
if (n1 != IMPOSS)
Pl_Stream_Printf(pstm, buff, n, n1, generic);
else
Pl_Stream_Printf(pstm, buff, n, generic);
}
else
Pl_Stream_Printf(pstm, buff, generic);
}
else
{
d = Arg_Float(&lst_adr);
if (n != IMPOSS)
{
if (n1 != IMPOSS)
Pl_Stream_Printf(pstm, buff, n, n1, d);
else
Pl_Stream_Printf(pstm, buff, n, d);
}
else
Pl_Stream_Printf(pstm, buff, d);
}
continue;
}
if (*format != '~')
{
Pl_Stream_Putc(*format, pstm);
format++;
continue;
}
if (*++format == '*')
{
n = Arg_Integer(&lst_adr);
format++;
has_n = TRUE;
}
else
{
p = format;
n = strtol(format, &format, 10);
has_n = (format != p);
}
switch (*format)
{
case 'a':
p = Arg_Atom(&lst_adr);
if (has_n)
Pl_Stream_Printf(pstm, "%*s", -n, p);
else
Pl_Stream_Puts(p, pstm);
break;
case 'c':
x = Arg_Integer(&lst_adr);
if (!Is_Valid_Code(x))
Pl_Err_Representation(pl_representation_character_code);
do
Pl_Stream_Putc(x, pstm);
while (--n > 0);
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
x = *format;
d = Arg_Float(&lst_adr);
if (has_n)
sprintf(buff, "%%.%ld%c", n, (char) x);
else
sprintf(buff, "%%%c", (char) x);
Pl_Stream_Printf(pstm, buff, d);
break;
case 'd':
case 'D':
x = Arg_Integer(&lst_adr);
if (n == 0 && *format == 'd')
{
Pl_Stream_Printf(pstm, "%ld", x);
break;
}
if (x < 0)
{
Pl_Stream_Putc('-', pstm);
x = -x;
}
sprintf(buff, "%ld", x);
lg = strlen(buff) - n;
if (lg <= 0)
{
Pl_Stream_Puts("0.", pstm);
for (i = 0; i < -lg; i++)
Pl_Stream_Putc('0', pstm);
Pl_Stream_Printf(pstm, "%ld", x);
break;
}
stop = (*format == 'D') ? lg % 3 : -1;
if (stop == 0)
stop = 3;
for (p = buff, i = 0; *p; p++, i++)
{
if (i == lg)
Pl_Stream_Putc('.', pstm), stop = -1;
if (i == stop)
Pl_Stream_Putc(',', pstm), stop += 3;
Pl_Stream_Putc(*p, pstm);
}
break;
case 'r':
case 'R':
x = Arg_Integer(&lst_adr);
if (!has_n || n < 2 || n > 36)
n = 8;
k = ((*format == 'r') ? 'a' : 'A') - 10;
if (x < 0)
{
Pl_Stream_Putc('-', pstm);
x = -x;
}
p = buff + sizeof(buff) - 1;
*p = '\0';
do
{
i = x % n;
x = x / n;
--p;
*p = (i < 10) ? i + '0' : i + k;
}
while (x);
Pl_Stream_Puts(p, pstm);
break;
case 's':
case 'S':
word = Read_Arg(&lst_adr);
if (*format == 's')
p = Pl_Rd_Codes_Check(word);
else
p = Pl_Rd_Chars_Check(word);
if (has_n)
Pl_Stream_Printf(pstm, "%-*.*s", n, n, p);
else
Pl_Stream_Printf(pstm, "%s", p);
break;
case 'i':
do
Read_Arg(&lst_adr);
while (--n > 0);
break;
case 'k':
word = Read_Arg(&lst_adr);
Pl_Write_Term(pstm, -1, MAX_PREC,
WRITE_IGNORE_OP | WRITE_QUOTED, word);
break;
case 'q':
word = Read_Arg(&lst_adr);
Pl_Write_Term(pstm, -1, MAX_PREC, WRITE_NUMBER_VARS |
WRITE_NAME_VARS | WRITE_QUOTED, word);
break;
case 'p': /* only work if print.pl is linked */
word = Read_Arg(&lst_adr);
Pl_Write_Term(pstm, -1, MAX_PREC, WRITE_NUMBER_VARS |
WRITE_NAME_VARS | WRITE_PORTRAYED, word);
break;
case 'w':
word = Read_Arg(&lst_adr);
Pl_Write_Term(pstm, -1, MAX_PREC, WRITE_NUMBER_VARS |
WRITE_NAME_VARS, word);
break;
case '~':
Pl_Stream_Putc('~', pstm);
break;
case 'N':
if (pstm->line_pos == 0)
break;
case 'n':
do
Pl_Stream_Putc('\n', pstm);
while (--n > 0);
break;
case '?':
if (format[1])
*top_stack++ = format + 1;
format = Arg_Atom(&lst_adr);
continue;
default:
Pl_Err_Domain(pl_domain_format_control_sequence,
Tag_ATM(ATOM_CHAR(*format)));
}
format++;
}
}
while (top_stack > format_stack);
}
/*-------------------------------------------------------------------------*
* COPY_TERM_REC *
* *
* p is the next address to use to store the rest of a term. *
*-------------------------------------------------------------------------*/
static void
Copy_Term_Rec(WamWord *dst_adr, WamWord *src_adr, WamWord **p)
{
WamWord word, tag_mask;
WamWord *adr;
WamWord *q;
int i;
terminal_rec:
DEREF(*src_adr, word, tag_mask);
switch (Tag_From_Tag_Mask(tag_mask))
{
case REF:
adr = UnTag_REF(word);
q = *p;
if (adr < q && adr >= base_copy) /* already a copy */
{
*dst_adr = word;
return;
}
if (top_vars >= end_vars)
Pl_Err_Representation(pl_representation_too_many_variables);
*top_vars++ = word; /* word to restore */
*top_vars++ = (WamWord) adr; /* address to restore */
*adr = *dst_adr = Tag_REF(dst_adr); /* bind to a new copy */
return;
#ifndef NO_USE_FD_SOLVER
case FDV:
adr = UnTag_FDV(word);
q = *p;
if (adr < q && adr >= base_copy) /* already a copy */
{
*dst_adr = Tag_REF(adr); /* since Dont_Separate_Tag */
return;
}
if (top_vars >= end_vars)
Pl_Err_Representation(pl_representation_too_many_variables);
*top_vars++ = word; /* word to restore */
*top_vars++ = (WamWord) adr; /* address to restore */
q = *p;
*p = q + Fd_Copy_Variable(q, adr);
*adr = *dst_adr = Tag_REF(q); /* bind to a new copy */
return;
#endif
case FLT:
adr = UnTag_FLT(word);
q = *p;
q[0] = adr[0];
#if WORD_SIZE == 32
q[1] = adr[1];
*p = q + 2;
#else
*p = q + 1;
#endif
*dst_adr = Tag_FLT(q);
return;
case LST:
adr = UnTag_LST(word);
q = *p;
*dst_adr = Tag_LST(q);
*p = &Cdr(q) + 1;
q = &Car(q);
adr = &Car(adr);
Copy_Term_Rec(q++, adr++, p);
dst_adr = q;
src_adr = adr;
goto terminal_rec;
case STC:
adr = UnTag_STC(word);
q = *p;
*dst_adr = Tag_STC(q);
Functor_And_Arity(q) = Functor_And_Arity(adr);
i = Arity(adr);
*p = &Arg(q, i - 1) + 1;
q = &Arg(q, 0);
adr = &Arg(adr, 0);
while (--i)
Copy_Term_Rec(q++, adr++, p);
dst_adr = q;
src_adr = adr;
goto terminal_rec;
default:
*dst_adr = word;
return;
}
}
