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int /*SUPPRESS 590*/
do_undef(TARG,arg,gimme,arglast)
STR *TARG;
register ARG *arg;
int gimme;
int *arglast;
{
register int type;
register STAB *stab;
int retarg = arglast[0] + 1;
if ((arg[1].arg_type & A_MASK) != A_LEXPR)
fatal("Illegal argument to undef()");
arg = arg[1].arg_ptr.arg_arg;
type = arg->arg_type;
if (type == O_ARRAY || type == O_LARRAY) {
stab = arg[1].arg_ptr.arg_stab;
afree(stab_xarray(stab));
stab_xarray(stab) = anew(stab); /* so "@array" still works */
}
else if (type == O_HASH || type == O_LHASH) {
stab = arg[1].arg_ptr.arg_stab;
if (stab == envstab)
environ[0] = Nullch;
else if (stab == sigstab) {
int i;
for (i = 1; i < NSIG; i++)
signal(i, SIG_DFL); /* munch, munch, munch */
}
(void)hfree(stab_xhash(stab), TRUE);
stab_xhash(stab) = Null(HASH*);
}
else if (type == O_SUBR || type == O_DBSUBR) {
stab = arg[1].arg_ptr.arg_stab;
if ((arg[1].arg_type & A_MASK) != A_WORD) {
STR *tmpstr = STAB_STR(arg[1].arg_ptr.arg_stab);
if (tmpstr)
stab = stabent(str_get(tmpstr),TRUE);
else
stab = Nullstab;
}
if (stab && stab_sub(stab)) {
cmd_free(stab_sub(stab)->cmd);
stab_sub(stab)->cmd = Nullcmd;
afree(stab_sub(stab)->tosave);
Safefree(stab_sub(stab));
stab_sub(stab) = Null(SUBR*);
}
}
else
fatal("Can't undefine that kind of object");
str_numset(TARG,0.0);
stack->ary_array[retarg] = TARG;
return retarg;
}
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