/*
 * The routines in this file
 * are called to create a subjob running
 * a command interpreter. This code is a big
 * fat nothing on CP/M-86. You lose.
 */
#include	<stdio.h>
#include	"ed.h"

#if	VMS
#define	EFN	0				/* Event flag.		*/

#include	<ssdef.h>			/* Random headers.	*/
#include	<stsdef.h>
#include	<descrip.h>
#include	<iodef.h>

extern	int	oldmode[];			/* In "termio.c"	*/
extern	int	newmode[];			/* In "termio.c"	*/
extern	short	iochan;				/* In "termio.c"	*/
#endif

#if	MSDOS
#include	<dos.h>
extern setkeys(), resetkeys();
#endif

#if	V7
#include	<signal.h>
#endif

/*
 * Create a subjob with a copy
 * of the command intrepreter in it. When the
 * command interpreter exits, mark the screen as
 * garbage so that you do a full repaint. Bound
 * to "C-C". The message at
 * the start in VMS puts out a newline. Under
 * some (unknown) condition, you don't get one
 * free when DCL starts up.
 */
spawncli(f, n)
{
#if	V7
	register char *cp;
	char	*getenv();
#endif
#if	VMS
	movecursor(term.t_nrow, 0);		/* In last line.	*/
	mlputs("[Starting DCL]\r\n");
	(*term.t_flush)();			/* Ignore "ttcol".	*/
	sgarbf = TRUE;
	return (sys(NULL));			/* NULL => DCL.		*/
#endif
#if	CPM
	mlwrite("Not in CP/M-86");
#endif
#if	MSDOS
	movecursor(term.t_nrow, 0);		/* Seek to last line.	*/
	(*term.t_flush)();
	resetkeys();
	sys("\\command.com", "");		/* Run CLI.		*/
	setkeys();
	sgarbf = TRUE;
	return(TRUE);
#endif
#if	V7
	movecursor(term.t_nrow, 0);		/* Seek to last line.	*/
	(*term.t_flush)();
	ttclose();				/* stty to old settings	*/
	if ((cp = getenv("SHELL")) != NULL && *cp != '\0')
		system(cp);
	else
		system("exec /bin/sh");
	sgarbf = TRUE;
	sleep(2);
	ttopen();
	return(TRUE);
#endif
}

/*
 * Run a one-liner in a subjob.
 * When the command returns, wait for a single
 * character to be typed, then mark the screen as
 * garbage so a full repaint is done.
 * Bound to "C-X !".
 */
spawn(f, n)
{
	register int	s;
	char		line[NLINE];
#if	VMS
	if ((s=mlreply("DCL command: ", line, NLINE)) != TRUE)
		return (s);
	(*term.t_putchar)('\n');		/* Already have '\r'	*/
	(*term.t_flush)();
	s = sys(line);				/* Run the command.	*/
	mlputs("\r\n\n[End]");			/* Pause.		*/
	(*term.t_flush)();
	while ((*term.t_getchar)() != '\r')
		;
	sgarbf = TRUE;
	return (s);
#endif
#if	CPM
	mlwrite("Not in CP/M-86");
	return (FALSE);
#endif
#if	MSDOS
	if ((s=mlreply("MS-DOS command: ", line, NLINE)) != TRUE)
		return (s);
	resetkeys();
	system(line);
	setkeys();
	while ((*term.t_getchar)() != '\r')	/* Pause.		*/
		;
	sgarbf = TRUE;
	return (TRUE);
#endif
#if	V7
	if ((s=mlreply("! ", line, NLINE)) != TRUE)
		return (s);
	(*term.t_putchar)('\n');		/* Already have '\r'	*/
	(*term.t_flush)();
	ttclose();				/* stty to old modes	*/
	system(line);
	sleep(2);
	ttopen();
	mlputs("[End]");			/* Pause.		*/
	(*term.t_flush)();
	while ((s = (*term.t_getchar)()) != '\r' && s != ' ')
		;
	sgarbf = TRUE;
	return (TRUE);
#endif
}

#if	VMS
/*
 * Run a command. The "cmd" is a pointer
 * to a command string, or NULL if you want to run
 * a copy of DCL in the subjob (this is how the standard
 * routine LIB$SPAWN works. You have to do wierd stuff
 * with the terminal on the way in and the way out,
 * because DCL does not want the channel to be
 * in raw mode.
 */
sys(cmd)
register char	*cmd;
{
	struct	dsc$descriptor	cdsc;
	struct	dsc$descriptor	*cdscp;
	long	status;
	long	substatus;
	long	iosb[2];

	status = SYS$QIOW(EFN, iochan, IO$_SETMODE, iosb, 0, 0,
			  oldmode, sizeof(oldmode), 0, 0, 0, 0);
	if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL)
		return (FALSE);
	cdscp = NULL;				/* Assume DCL.		*/
	if (cmd != NULL) {			/* Build descriptor.	*/
		cdsc.dsc$a_pointer = cmd;
		cdsc.dsc$w_length  = strlen(cmd);
		cdsc.dsc$b_dtype   = DSC$K_DTYPE_T;
		cdsc.dsc$b_class   = DSC$K_CLASS_S;
		cdscp = &cdsc;
	}
	status = LIB$SPAWN(cdscp, 0, 0, 0, 0, 0, &substatus, 0, 0, 0);
	if (status != SS$_NORMAL)
		substatus = status;
	status = SYS$QIOW(EFN, iochan, IO$_SETMODE, iosb, 0, 0,
			  newmode, sizeof(newmode), 0, 0, 0, 0);
	if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL)
		return (FALSE);
	if ((substatus&STS$M_SUCCESS) == 0)	/* Command failed.	*/
		return (FALSE);
	return (TRUE);
}
#endif

#if	MSDOS
/*
 * This routine, once again
 * by Bob McNamara, is a C translation
 * of the "system" routine in the MWC-86 run
 * time library. It differs from the "system" routine
 * in that it does not unconditionally append the
 * string ".exe" to the end of the command name.
 * We needed to do this because we want to be
 * able to spawn off "command.com". We really do
 * not understand what it does, but if you don't
 * do it exactly "malloc" starts doing very
 * very strange things.
 */
sys(cmd, tail)
char	*cmd;
char	*tail;
{
	register unsigned n;
	extern   char	  *__end;

	n = __end + 15;
	n >>= 4;
	n = ((n + dsreg() + 16) & 0xFFF0) + 16;
	return(execall(cmd, tail, n));
}
#endif