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#include "mk.h"
static Shell *shells[] = {
&rcshell,
&shshell
};
Shell *shelldefault = &shshell;
Shell *shellt;
Word *shellcmd;
typedef struct Shellstack Shellstack;
struct Shellstack
{
Shell *t;
Word *w;
Shellstack *next;
};
Shellstack *shellstack;
char*
setshell(Word *w)
{
int i;
if(w->s == nil)
return "shell name not found on line";
for(i=0; i<nelem(shells); i++)
if(shells[i]->matchname(w->s))
break;
if(i == nelem(shells))
return "cannot determine shell type";
shellt = shells[i];
shellcmd = w;
return nil;
}
void
initshell(void)
{
shellcmd = stow(shelldefault->name);
shellt = shelldefault;
setvar("MKSHELL", shellcmd);
}
void
pushshell(void)
{
Shellstack *s;
/* save */
s = Malloc(sizeof *s);
s->t = shellt;
s->w = shellcmd;
s->next = shellstack;
shellstack = s;
initshell(); /* reset to defaults */
}
void
popshell(void)
{
Shellstack *s;
if(shellstack == nil){
fprint(2, "internal shellstack error\n");
Exit();
}
s = shellstack;
shellstack = s->next;
shellt = s->t;
shellcmd = s->w;
setvar("MKSHELL", shellcmd);
free(s);
}
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