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#include "rc.h"
void
pushlist(void)
{
List *ls;
alloc(ls);
ls->words = nil;
ls->link = shell->stack, shell->stack = ls;
}
void
freelist(Word *w)
{
Word *it;
while (w) {
it = w->link;
efree(w->word);
efree(w);
w = it;
}
}
void
poplist(void)
{
List *ls = shell->stack;
if (!ls)
panicf("shell stack underflow");
freelist(ls->words);
shell->stack = ls->link;
efree(ls);
}
int
count(Word *w)
{
int n;
for (n=0; w; n++)
w = w->link;
return n;
}
Word*
newword(char *w, Word *link)
{
Word *wd;
alloc(wd);
wd->word = strdup(w);
wd->link = link;
return wd;
}
void
pushword(char *w)
{
if (shell->stack == nil)
panicf("no active stack");
shell->stack->words = newword(w, shell->stack->words);
}
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