/*
* Return the CONTENT of a VARIABLE with NAME.
* If the content is non-nil then bump its
* reference counter.
*/
ETERM *erl_var_content (const ETERM *ep, const char *name)
{
int i;
ETERM *vp;
if ((!ep) || (!name)) return NULL;
/* ASSERT(ep != NULL); */
switch(ERL_TYPE(ep))
{
case ERL_VARIABLE:
if (strcmp(ERL_VAR_NAME(ep), name) == 0) {
if ((vp = ERL_VAR_VALUE(ep)) != NULL) {
ERL_COUNT(vp)++;
return vp;
}
}
break;
case ERL_LIST:
while (ep && (ERL_TYPE(ep) != ERL_EMPTY_LIST)) {
if ((vp = erl_var_content(HEAD(ep), name))) return vp;
ep = TAIL(ep);
}
break;
case ERL_TUPLE:
for (i=0; i < ERL_TUPLE_SIZE(ep); i++)
if ((vp = erl_var_content(ERL_TUPLE_ELEMENT(ep, i), name)))
{
return vp;
}
break;
default:
/* variables can't occur in other types */
break;
}
/* nothing found ! */
return NULL;
}
/*
* Create an empty VARIABLE.
*/
ETERM *erl_mk_var(const char *s)
{
ETERM *ep;
if (!s) return NULL;
/* ASSERT(s != NULL); */
ep = erl_alloc_eterm(ERL_VARIABLE);
ERL_COUNT(ep) = 1;
ERL_VAR_LEN(ep) = strlen(s);
if ((ERL_VAR_NAME(ep) = strsave(s)) == NULL)
{
erl_free_term(ep);
erl_errno = ENOMEM;
return NULL;
}
ERL_VAR_VALUE(ep) = (ETERM *) NULL;
return ep;
}
/*
* Dump (print for debugging) a term. Useful if/when things go wrong.
*/
void
dump_term (FILE *fp, ETERM *t)
{
if (fp == NULL) return;
fprintf(fp, "#<%p ", t);
if(t != NULL)
{
fprintf(fp, "count:%d, type:%d", ERL_COUNT(t), ERL_TYPE(t));
switch(ERL_TYPE(t))
{
case ERL_UNDEF:
fprintf(fp, "==undef");
break;
case ERL_INTEGER:
fprintf(fp, "==int, val:%d", ERL_INT_VALUE(t));
break;
case ERL_U_INTEGER:
fprintf(fp, "==uint, val:%u", ERL_INT_UVALUE(t));
break;
case ERL_FLOAT:
fprintf(fp, "==float, val:%g", ERL_FLOAT_VALUE(t));
break;
case ERL_ATOM:
fprintf(fp, "==atom, name:%p \"%s\"",
ERL_ATOM_PTR(t), ERL_ATOM_PTR(t));
break;
case ERL_BINARY:
fprintf(fp, "==binary, data:%p,%u",
ERL_BIN_PTR(t), ERL_BIN_SIZE(t));
break;
case ERL_PID:
fprintf(fp, "==pid, node:%p \"%s\"",
ERL_PID_NODE(t), ERL_PID_NODE(t));
break;
case ERL_PORT:
fprintf(fp, "==port, node:%p \"%s\"",
ERL_PORT_NODE(t), ERL_PORT_NODE(t));
break;
case ERL_REF:
fprintf(fp, "==ref, node:%p \"%s\"",
ERL_REF_NODE(t), ERL_REF_NODE(t));
break;
case ERL_CONS:
fprintf(fp, "==cons");
fprintf(fp, ", car:");
dump_term(fp, ERL_CONS_HEAD(t));
fprintf(fp, ", cdr:");
dump_term(fp, ERL_CONS_TAIL(t));
break;
case ERL_NIL:
fprintf(fp, "==nil");
break;
case ERL_TUPLE:
fprintf(fp, "==tuple, elems:%p,%u",
ERL_TUPLE_ELEMS(t), ERL_TUPLE_SIZE(t));
{
size_t i;
for(i = 0; i < ERL_TUPLE_SIZE(t); i++)
{
fprintf(fp, "elem[%u]:", i);
dump_term(fp, ERL_TUPLE_ELEMENT(t, i));
}
}
break;
case ERL_VARIABLE:
fprintf(fp, "==variable, name:%p \"%s\"",
ERL_VAR_NAME(t), ERL_VAR_NAME(t));
fprintf(fp, ", value:");
dump_term(fp, ERL_VAR_VALUE(t));
break;
default:
break;
}
}
fprintf(fp, ">");
}
