/*	This file is for functions dealing with execution of
 *	commands, command lines, buffers, files and startup files
 *
 *	written 1986 by Daniel Lawrence
 *	much modified since then.  assign no blame to him.  -pgf
 *
 * $Header: /usr/build/vile/vile/RCS/exec.c,v 1.164 1998/09/01 10:12:45 tom Exp $
 *
 */

#include	"estruct.h"
#include	"edef.h"
#include	"nefunc.h"

/*	Directive definitions	*/

typedef	enum {
	D_UNKNOWN,
#if ! SMALLER
	D_IF,
	D_ELSEIF,
	D_ELSE,
	D_ENDIF,
	D_GOTO,
	D_RETURN,
	D_WHILE,
	D_ENDWHILE,
	D_BREAK,
	D_FORCE,
#endif
	D_ENDM
} DIRECTIVE;

#define isSPorTAB(c) ((c) == ' ' || (c) == '\t')

static	int	rangespec(const char *specp, LINEPTR *fromlinep, LINEPTR *tolinep, CMDFLAGS *flagp);

/*	The !WHILE directive in the execution language needs to
	stack references to pending whiles. These are stored linked
	to each currently open procedure via a linked list of
	the following structure
*/

typedef struct WHBLOCK {
	LINEPTR	w_begin;	/* ptr to !while statement */
	LINEPTR	w_end;		/* ptr to the !endwhile statement*/
	DIRECTIVE w_type;	/* block type */
	struct WHBLOCK *w_next;	/* next while */
} WHBLOCK;

/* directive name table:
	This holds the names of all the directives....	*/

#if !SMALLER
static	const struct {
		const DIRECTIVE type;
		const char *const name;
	} dname[] = {
	{ D_IF,       "if" },
	{ D_ELSEIF,   "elseif" },
	{ D_ELSE,     "else" },
	{ D_ENDIF,    "endif" },
	{ D_GOTO,     "goto" },
	{ D_RETURN,   "return" },
	{ D_WHILE,    "while" },
	{ D_ENDWHILE, "endwhile" },
	{ D_BREAK,    "break" },
	{ D_FORCE,    "force" },
	{ D_ENDM,     "endm" }
	};
#endif

static int token_ended_line;  /* did the last token end at end of line? */

typedef struct {
	int disabled;		/* nonzero to disable execution */
	int level;		/* ~if ... ~endif nesting level */
	int fired;		/* at top-level, ~if/... used */
	} IFSTK;

static IFSTK ifstk;

/*----------------------------------------------------------------------------*/

/*ARGSUSED*/
static int
eol_range(const char * buffer, unsigned cpos, int c, int eolchar GCC_UNUSED)
{
	if (is_edit_char(c))
		return FALSE;

	if (isspecial(c)	/* sorry, cannot scroll with arrow keys */
	 || isCntrl(c))
		return TRUE;

	if (islinespecchar(c)
	 || (c == ':' && (cpos == 0 || buffer[cpos-1] == c))
	 || /* special test for 'a style mark references */
		(cpos != 0
		&& buffer[cpos-1] == '\''
		&& (isLower(c) || (c == '\'') ) ) )
		return FALSE;
	return TRUE;
}

/*
 * Returns true iff the user ended the last prompt with a carriage-return.
 */
static int
end_of_cmd(void)
{
	register int c = end_string();
	return isreturn(c);
}

/* returns true iff we are in a named-command and if the user ended the last
 * prompt with a carriage-return.
 */
int
end_named_cmd(void)
{
	if (isnamedcmd) {
		if (clexec)
			return token_ended_line;
		else
			return end_of_cmd();
	}
	return FALSE;
}

/* returns true iff we are in a named-command and if the user did not end the
 * last prompt with a carriage-return.
 */
int
more_named_cmd(void)
{
	if (isnamedcmd) {
		if (clexec)
			return !token_ended_line;
		else
			return !end_of_cmd();
	}
	return FALSE;
}

/* namedcmd:	execute a named command even if it is not bound */
#if SMALLER
#define execute_named_command namedcmd
#else
static	/* next procedure is local */
#endif

int
execute_named_command(int f, int n)
{
	register int	status;
	register const CMDFUNC *cfp; /* function to execute */
	register char *fnp;	/* ptr to the name of the cmd to exec */

	LINEPTR fromline;	/* first linespec */
	LINEPTR toline;		/* second linespec */
	MARK	save_DOT;
	MARK	last_DOT;
	static TBUFF *lspec;	/* text of line spec */
	char cspec[NLINE];	/* text of command spec */
	int cmode = 0;
	int c;
	char repeat_cmd = EOS;
	int maybe_reg, maybe_num;
	CMDFLAGS lflag, flags;

	tb_scopy(&lspec, "");
	last_DOT = DOT;

	/* prompt the user to type a named command */
	mlprompt(": ");

	/* and now get the function name to execute */
	for_ever {
		if (cmode == 0) {	/* looking for range-spec, if any */
			status = kbd_reply(
				(char *)0,	/* no-prompt => splice */
				&lspec,		/* in/out buffer */
				eol_range,
				EOS,		/* may be a conflict */
				0,		/* no expansion, etc. */
				no_completion);
			c = end_string();
			if (status != TRUE && status != FALSE) {
				if (status == SORTOFTRUE) {
					(void)keystroke(); /* cancel ungetc */
					return FALSE;
				}
				return status;
			} else if (isreturn(c) && (status == FALSE)) {
				return FALSE;
			} else {
				unkeystroke(c);	/* ...so we can splice */
			}
			cmode = 1;
			repeat_cmd = EOS;
		} else {			/* looking for command-name */
			fnp = NULL;
			status = kbd_engl_stat((char *)0, cspec, KBD_STATED);
			if (status == TRUE) {
				fnp = cspec;
#if !SMALLER
				if (isRepeatable(*fnp) && clexec) {
					repeat_cmd = *fnp;
					cmode++;
					hst_glue(EOS);
				} else
#endif
				 if (isRepeatable(*fnp) && (*fnp == end_string())) {
					unkeystroke(*fnp);
					repeat_cmd = *fnp;
					cmode++;
					hst_glue(EOS);
				} else {
					c = fnp[strlen(fnp)-1];
					if (isPunct(c)) {
						c = end_string();
						if (c != NAMEC
						 && c != ' '
						 && !isreturn(c)) {
							unkeystroke(c);
							/* e.g., !-command */
						 }
					} else {	/* e.g., ":e#" */
						c = end_string();
						if (isPunct(c)
						 && strchr(global_g_val_ptr(GVAL_EXPAND_CHARS),c) != 0)
							unkeystroke(c);
					}
					break;
				}
			} else if (status == SORTOFTRUE) {
				hst_remove((cmode > 1) ? "*" : "");
				if (cmode > 1)
					(void)keystroke(); /* eat the delete */
				if (--cmode <= 1) {
					cmode = 0;
					hst_remove(tb_values(lspec));
				}
			} else if ((status == ABORT) || (lastkey == killc)) {
				return status;
			} else {	/* status == FALSE (killc/wkillc) */
				if (cmode > 1) {
					fnp = cspec;
					cmode--;
					break;
				} else {
					if (tb_length(lspec) <= 1) {
						return status;
					} else {
						break;	/* range-only */
					}
				}
			}
		}
	}

	/* reconstruct command if user edited it */
	if (repeat_cmd != EOS && fnp != 0 && *fnp == EOS) {
		fnp[0] = repeat_cmd;
		fnp[1] = EOS;
	}

	/* infer repeat count from repeated-command */
	if (cmode > 1) {
		if (!f) {
			f = TRUE;
			n = cmode;
		} else {
			mlforce("[Redundant repeat-count]");
			return FALSE;
		}
	}

	/* parse the accumulated lspec */
	if (rangespec(tb_values(lspec), &fromline, &toline, &lflag) != TRUE) {
		mlforce("[Improper line range]");
		return FALSE;
	}

	/* if range given, and it wasn't "0" and the buffer's empty */
	if (!(lflag & (DFLALL|ZERO)) && is_empty_buf(curbp)) {
		mlforce("[No range possible in empty buffer]", fnp);
		return FALSE;
	}

	/* did we get a name? */
	if (fnp == NULL) {
		if ((lflag & DFLALL)) { /* no range, no function */
			return FALSE;
		} else { /* range, no function */
			cfp = &f_gomark;
			fnp = "";
		}
	} else if ((cfp = engl2fnc(fnp)) == NULL) { /* bad function */
		return no_such_function(fnp);
	}

	ev_end_of_cmd = end_of_cmd();
	flags = cfp->c_flags;

	/* bad arguments? */
#ifdef EXRC_FILES
seems like we need one more check here -- is it from a .exrc file?
	    cmd not ok in .exrc 		empty file
	if (!(flags & EXRCOK) && is_empty_buf(curbp)) {
		mlforce("[Can't use the \"%s\" command in a %s file.]",
					cmdnames[cmdidx].name, EXRC);
		return FALSE;
	}
#endif

	/* was: if (!(flags & (ZERO | EXRCOK)) && fromline == NULL ) */
	if ((lflag & ZERO)) {
		if (!(flags & ZERO)) {
			mlforce("[Can't use address 0 with \"%s\" command]", fnp);
			return FALSE;
		}
		if (fromline == null_ptr)
			fromline = buf_head(curbp); /* buffer is empty */

		/*  we're positioned at fromline == curbp->b_linep, so commands
			must be willing to go _down_ from there.  Seems easiest
			to special case the commands that prefer going up */
		if (cfp == &f_insfile) {
			/* EMPTY */ /* works okay, or acts down normally */ ;
		} else if (cfp == &f_lineputafter) {
			cfp = &f_lineputbefore;
			fromline = lforw(fromline);
		} else if (cfp == &f_opendown) {
			cfp = &f_openup;
			fromline = lforw(fromline);
		} else if (cfp == &f_gomark) {
			fromline = lforw(fromline);
		} else {
			mlforce("[Configuration error: ZERO]");
			return FALSE;
		}
		flags = cfp->c_flags;
		toline = fromline;
	}

	/* if we're not supposed to have a line no., and the line no. isn't
		the current line, and there's more than one line */
	if (!(flags & FROM) && (fromline != DOT.l) &&
			!is_empty_buf(curbp) &&
		  (lforw(lforw(buf_head(curbp))) != buf_head(curbp)) ) {
		mlforce("[Can't use address with \"%s\" command.]", fnp);
		return FALSE;
	}
	/* if we're not supposed to have a second line no., and the line no.
		isn't the same as the first line no., and there's more than
		one line */
	if (!(flags & TO) && (toline != fromline) &&
			!is_empty_buf(curbp) &&
		  (lforw(lforw(buf_head(curbp))) != buf_head(curbp)) ) {
		mlforce("[Can't use a range with \"%s\" command.]", fnp);
		return FALSE;
	}

	/* some commands have special default ranges */
	if (lflag & DFLALL) {
		if (flags & DFLALL) {
			if (cfp == &f_showlength) {
				fromline = lforw(buf_head(curbp));
				toline   = lback(buf_head(curbp));
			} else if (cfp == &f_operwrite) {
				cfp = &f_filewrite;
			} else if (cfp == &f_operglobals) {
				cfp = &f_globals;
			} else if (cfp == &f_opervglobals) {
				cfp = &f_vglobals;
			} else {
				mlforce("[Configuration error: DFLALL]");
				return FALSE;
			}
			lflag |= (FROM|TO); /* avoid prompt for line-count */
		} else if (flags & DFLNONE) {
#if OPT_SHELL
			if (cfp == &f_operfilter) {
				cfp = &f_spawn;
				(void)setmark();  /* not that it matters */
			} else
#endif
#if OPT_PERL
			if (cfp == &f_perl) {
				perl_default_region();
			} else
#endif
			{
				mlforce("[Configuration error: DFLNONE]");
				return FALSE;
			}
			fromline = toline = null_ptr;
			lflag |= (FROM|TO); /* avoid prompt for line-count */
		} else
			lflag &= ~DFLALL;
	}

	/* Process argument(s) for named-buffer & line-count, if present.  The
	 * line-count is expected only if no "to" address specification was
	 * given.
	 */
	if ((*fnp != EOS) && !end_of_cmd() && !isPunct(end_string())) {
		maybe_reg = ((flags & OPTREG) == OPTREG);
		maybe_num = ((flags & TO) == TO)
			&& !((lflag & TO) == TO);
		if (maybe_num && (lflag & FROM)) {
			toline = fromline;
			maybe_num = FALSE;
		}
	} else {
		maybe_reg =
		maybe_num = FALSE;
	}

	if (maybe_reg || maybe_num) {
		int	num,
			that = (maybe_num && maybe_reg)
				? 0
				: (maybe_num ? 1 : -1),
			last = maybe_num ? 2 : 1;

		while (!end_of_cmd() && (that < last)) {
			status = mlreply_reg_count(that, &num, &that);
			if (status == ABORT)
				return status;
			else if (status != TRUE)
				break;
			if (that == 2) {
				if (is_empty_buf(curbp)) {
				    mlforce(
			    "[No line count possible in empty buffer]", fnp);
				    return FALSE;
				}
				swapmark();
				DOT.l = fromline;
				(void)forwline(TRUE, num-1);
				toline = DOT.l;
				swapmark();
			} else {
				ukb = (short)num;
				kregflag = (that == 1) ? KAPPEND : 0;
				that = 1;
				/* patch: need to handle recursion */
			}
		}
	}

	if (flags & NOMOVE)
		save_DOT = DOT;
	else if ((toline != null_ptr) || (fromline != null_ptr)) {
		/* assume it's an absolute motion */
		/* we could probably do better */
		curwp->w_lastdot = DOT;
	}
	if ((toline != null_ptr) && (flags & TO)) {
		DOT.l = toline;
		(void)firstnonwhite(FALSE,1);
		(void)setmark();
	}
	if ((fromline != null_ptr) && (flags & FROM)) {
		DOT.l = fromline;
		(void)firstnonwhite(FALSE,1);
		if (toline == null_ptr)
			(void)setmark();
	}
	if (!sameline(last_DOT, DOT))
		curwp->w_flag |= WFMOVE;

	/* and then execute the command */
	isnamedcmd = TRUE;
	havemotion = &f_gomark;
	regionshape = FULLLINE;

	/* if the command ended with a bang, let the function know
		that so it can take special action */
	if ((flags & BANG) && (fnp[strlen(fnp)-1] == '!')) {
		f = TRUE;
		n = SPECIAL_BANG_ARG;
	}

	/*
	 * Ensure that we've completed the command properly.  (We could make
	 * the same check after 'execute()', but that would tend to obscure
	 * informational/warning messages...).
	 */
	if (flags == NONE
	 && end_string() != ' '
	 && !end_of_cmd()) {
		status = FALSE;
		if (!mapped_c_avail())
			unkeystroke(end_string());
		c = kbd_seq();
		mlforce("[Extra characters after \"%s\" command]", fnp);
	} else {
		status = execute(cfp,f,n);
	}

	havemotion = NULL;
	isnamedcmd = FALSE;
	regionshape = EXACT;

	/* don't use this if the command modifies! */
	if (flags & NOMOVE) {
		if (!samepoint(DOT, save_DOT)) {
			DOT = save_DOT;
			/* if an update() was called somewhere along
			   the way (as a result of mlyesno, for instance),
			   then we _have_ moved, so resetting DOT to
			   it's first value constitutes another one. */
			/* i think at worst this means an extra call to
			   reframe...  */
			curwp->w_flag |= WFMOVE;
		}
	}

	return status;
}

#if !SMALLER
/* intercept calls on 'namedcmd()' to allow logging of all commands, even
 * those that have errors in them.
 */
int
namedcmd(int f, int n)
{
	int status;
	hst_init(EOS);
	status = execute_named_command(f,n);
	hst_flush();
	return status;
}
#endif

/* parse an ex-style line spec -- code culled from elvis, file ex.c, by
	Steve Kirkendall
*/
static const char *
parse_linespec(
register const char *s,		/* start of the line specifier */
LINEPTR		*markptr)	/* where to store the mark's value */
{
	int		num;
	LINE		*lp;	/* where the linespec takes us */
	register const char *t;
	int		status;

	(void)setmark();
	lp = NULL;

	/* parse each ;-delimited clause of this linespec */
	do {
		/* skip an initial ';', if any */
		if (*s == ';')
			s++;

		/* skip leading spaces */
		while (isSPorTAB(*s))
			s++;

		/* dot means current position */
		if (*s == '.') {
			s++;
			lp = DOT.l;
		} else if (*s == '$') { /* '$' means the last line */
			s++;
			status = gotoeob(TRUE,1);
			if (status) lp = DOT.l;
		} else if (isDigit(*s)) {
			/* digit means an absolute line number */
			for (num = 0; isDigit(*s); s++) {
				num = num * 10 + *s - '0';
			}
			status = gotoline(TRUE,num);
			if (status) lp = DOT.l;
		} else if (*s == '\'') {
			/* apostrophe means go to a set mark */
			s++;
			status = gonmmark(*s);
			if (status) lp = DOT.l;
			s++;
		} else if (*s == '+') {
			s++;
			for (num = 0; isDigit(*s); s++)
				num = num * 10 + *s - '0';
			if (num == 0)
				num++;
			while (*s == '+')
				s++, num++;
			status = forwline(TRUE,num);
			if (status)
				lp = DOT.l;
		} else if (*s == '-') {
			s++;
			for (num = 0; isDigit(*s); s++)
					num = num * 10 + *s - '0';
			if (num == 0)
				num++;
			while (*s == '-')
				s++, num++;
			status = forwline(TRUE,-num);
			if (status)
				lp = DOT.l;
		}
#if PATTERNS
		else if (*s == '/' || *s == '?') { /* slash means do a search */
			/* put a null at the end of the search pattern */
			t = parseptrn(s);

			/* search for the pattern */
			lp &= ~(BLKSIZE - 1);
			if (*s == '/') {
				pfetch(markline(lp));
				if (plen > 0)
					lp += plen - 1;
				lp = m_fsrch(lp, s);
			} else {
				lp = m_bsrch(lp, s);
			}

			/* adjust command string pointer */
			s = t;
		}
#endif
		else if (*s == EOS) {	/* empty string matches '.' */
			lp = DOT.l;
		}

		/* if linespec was faulty, quit now */
		if (!lp) {
			*markptr = lp;
			swapmark();
			return s;
		}

		/* maybe add an offset */
		t = s;
		if (*t == '-' || *t == '+') {
			s++;
			for (num = 0; isDigit(*s); s++) {
				num = num * 10 + *s - '0';
			}
			if (num == 0)
				num = 1;
			if (forwline(TRUE, (*t == '+') ? num : -num) == TRUE)
				lp = DOT.l;
		}
	} while (*s == ';' || *s == '+' || *s == '-');

	*markptr = lp;
	swapmark();
	return s;
}

/* parse an ex-style line range -- code culled from elvis, file ex.c, by
	Steve Kirkendall
*/
static int
rangespec(
const char	*specp,		/* string containing a line range */
LINEPTR		*fromlinep,	/* first linespec */
LINEPTR		*tolinep,	/* second linespec */
CMDFLAGS	*flagp)
{
	register const char *scan;	/* used to scan thru specp */
	LINEPTR		fromline;	/* first linespec */
	LINEPTR		toline;		/* second linespec */

	*flagp = 0;

	/* ignore command lines that start with a double-quote */
	if (*specp == '"') {
		*fromlinep = *tolinep = DOT.l;
		return TRUE;
	}

	/* permit extra colons at the start of the line */
	while (isSPorTAB(*specp) || *specp == ':') {
		specp++;
	}

	/* parse the line specifier */
	scan = specp;
	if (*scan == '0') {
		fromline = toline = buf_head(curbp); /* _very_ top of buffer */
		*flagp |= (FROM|ZERO);
		scan++;
	} else if (*scan == '%') {
		/* '%' means all lines */
		fromline = lforw(buf_head(curbp));
		toline = lback(buf_head(curbp));
		scan++;
		*flagp |= (FROM|TO);
	} else {
		scan = parse_linespec(scan, &toline);
		*flagp |= FROM;
		if (toline == null_ptr)
			toline = DOT.l;
		fromline = toline;
		while (*scan == ',') {
			fromline = toline;
			scan++;
			scan = parse_linespec(scan, &toline);
			*flagp |= TO;
			if (toline == null_ptr) {
				/* faulty line spec */
				return FALSE;
			}
		}
	}

	if (is_empty_buf(curbp))
		fromline = toline = null_ptr;

	if (scan == specp)
		*flagp |= DFLALL;

	/* skip whitespace */
	while (isSPorTAB(*scan))
		scan++;

	if (*scan) {
		/* dbgwrite("crud at end %s (%s)",specp, scan); */
		return FALSE;
	}

	*fromlinep = fromline;
	*tolinep = toline;

	return TRUE;
}

/*	docmd:	take a passed string as a command line and translate
		it to be executed as a command. This function will be
		used by execute-command-line and by all source and
		startup files.

	format of the command line is:

		{# arg} <command-name> {<argument string(s)>}

*/

int
docmd(
char *cline,	/* command line to execute */
int execflag,
int f, int n)
{
	int status;		/* return status of function */
	int oldcle;		/* old contents of clexec flag */
	const char *oldestr;	/* original exec string */
	char tkn[NSTRING];	/* next token off of command line */
	const CMDFUNC *cfp;

	set_end_string(EOS);
	oldestr = execstr;	/* save last ptr to string to execute */
	execstr = cline;	/* and set this one as current */

	do {
		if ((status = macarg(tkn)) != TRUE) {	/* grab first token */
			execstr = oldestr;
			return status;
		}
		if (*tkn == ':') {	/* allow leading ':' on line */
			register int j;
			for (j = 0; (tkn[j] = tkn[j+1]) != EOS; j++)
				;
		}
	} while (!*tkn);

	/* process leading argument */
	if (toktyp(tkn) != TKCMD) {
		f = TRUE;
		n = atoi(strcpy(tkn, tokval(tkn)));

		/* and now get the command to execute */
		if ((status = macarg(tkn)) != TRUE) {
			execstr = oldestr;
			return status;
		}
	}

	/* and match the token to see if it exists */
	if ((cfp = engl2fnc(tkn)) == NULL) {
		execstr = oldestr;
		return no_such_function(tkn);
	}

	/* save the arguments and go execute the command */
	oldcle = clexec;		/* save old clexec flag */
	clexec = execflag;		/* in cline execution */
	/* flag the first time through for some commands -- e.g. subst
		must know to not prompt for strings again, and pregion
		must only restart the p-lines buffer once for each
		command. */
	calledbefore = FALSE;
	status = execute(cfp,f,n);
	cmdstatus = status;		/* save the status */
	clexec = oldcle;		/* restore clexec flag */
	execstr = oldestr;
	return status;
}

/*
 *  Call the appropriate action for a given CMDFUNC
 */
int
call_cmdfunc(const CMDFUNC *p, int f, int n)
{
    switch (p->c_flags & CMD_TYPE)
    {
    case CMD_FUNC: /* normal CmdFunc */
	return (CMD_U_FUNC(p))(f, n);

#if OPT_NAMEBST
#if OPT_PROCEDURES
    case CMD_PROC: /* named procedure */
	return dobuf(CMD_U_BUFF(p));
#endif

#if OPT_PERL
    case CMD_PERL: /* perl subroutine */
	return perl_call_sub(CMD_U_PERL(p), p->c_flags & OPER, f, n);
#endif
#endif /* OPT_NAMEBST */
    }

    mlforce("BUG: invalid CMDFUNC type");
    return FALSE;
}

/*
 * This is the general command execution routine. It takes care of checking
 * flags, globals, etc, to be sure we're not doing something dumb.
 * Return the status of command.
 */

int
execute(
const CMDFUNC *execfunc,	/* ptr to function to execute */
int f, int n)
{
	register int status;
	register CMDFLAGS flags;

	if (execfunc == NULL) {
#if OPT_REBIND
		mlwarn("[Key not bound]");	/* complain		*/
#else
		mlwarn("[Not a command]");	/* complain		*/
#endif
		return FALSE;
	}

	flags = execfunc->c_flags;

	/* commands following operators can't be redone or undone */
	if ( !doingopcmd && !doingsweep) {
		/* don't record non-redoable cmds, */
		/* but if we're in insertmode, it's okay, since we must
			be executing a function key, like an arrow key,
			that the user will want to have replayed later */
		if ((curwp == NULL || !insertmode) && (flags & REDO) == 0)
			dotcmdstop();
		if (flags & UNDO) {
			/* undoable command can't be permitted when read-only */
			if (!(flags & VIEWOK)) {
				if (b_val(curbp,MDVIEW))
					return rdonly();
#ifdef MDCHK_MODTIME
				if (!b_is_changed(curbp) &&
					!ask_shouldchange(curbp))
					return FALSE;
#endif
			}
			if (!kbd_replaying(FALSE))
				mayneedundo();
		}
	}

	if (dotcmdmode != PLAY) {
		if (execfunc != &f_dotcmdplay) {
			/* reset dotcmdkreg on any command where ukb is
			 * unspecified.  usekreg() does it on the one's
			 * where it is specified.  */
			if (ukb == 0)
			    dotcmdkreg = 0;

			/* override the saved dot-cmd argument, if this
				is a new redoable command */
			if (flags & REDO)
			    dotcmdarg = FALSE;
		}
	} else {
		/* if we _are_ playing, re-use the previously kreg */
		if (dotcmdkreg != 0)
			ukb = dotcmdkreg;
	}

	if (curwp->w_tentative_lastdot.l == null_ptr)
		curwp->w_tentative_lastdot = DOT;

	status = call_cmdfunc(execfunc, f, n);
	if ((flags & GOAL) == 0) { /* goal should not be retained */
		curgoal = -1;
	}

	/* if motion was absolute, and it wasn't just on behalf of an
		operator, and we moved, update the "last dot" mark */
	if ((flags & ABSM) && !doingopcmd &&
			!sameline(DOT, curwp->w_tentative_lastdot)) {
		curwp->w_lastdot = curwp->w_tentative_lastdot;
	}

	curwp->w_tentative_lastdot = DOT;


	return status;
}

/* token:	chop a token off a string
		return a pointer past the token
*/

const char *
token(
const char *src,	/* source string */
char *tok,		/* destination token string */
int eolchar)
{
	register int quotef = EOS;	/* nonzero iff the current string quoted */
	register int c, i, d;

	/* first scan past any whitespace in the source string */
	while (isSPorTAB(*src))
		++src;

	/* scan through the source string */
	while ((c = *src) != EOS) {
		/* process special characters */
		if (c == '\\') {
			src++;
			if (*src == EOS)
				break;
			switch (c = *src++) {
				case 'r':	*tok++ = '\r'; break;
				case 'n':	*tok++ = '\n'; break;
				case 't':	*tok++ = '\t';  break;
				case 'b':	*tok++ = '\b';  break;
				case 'f':	*tok++ = '\f'; break;
				case 'a':	*tok++ = '\007'; break;
				case 's':	*tok++ = ' '; break;
				case 'e':	*tok++ = ESC; break;

				case 'x':
				case 'X':
					i = 2; /* allow \xNN hex */
					c = 0;
					while (isAlnum(*src) && i--) {
						if (isDigit(*src)) {
							d = *src - '0';
						} else if (isLower(*src)) {
							d = *src - 'a' + 10;
						} else {
							d = *src - 'A' + 10;
						}
						if (d > 15)
							break;
						c = (c * 16) + d;
						src++;
					}
					*tok++ = (char)c;
					break;

				default:
					if (c >= '0' && c <= '7') {
						i = 2; /* allow \NNN octal */
						c -= '0';
						while (isDigit(*src)
						  && *src < '8'
						  && i--) {
							c = (c * 8) + (*src++ - '0');
						}
					}
					*tok++ = (char)c;
			}
		} else {
			/* check for the end of the token */
			if (quotef != EOS) {
				if (c == quotef) {
					src++;
					break;
				}
			} else {
				if (c == eolchar) {
					if (!isSPorTAB(c))
						src++;
					break;
				} else if (c == '"') {
					quotef = c;
					/* note that leading quote
						is included */
				} else if (isSPorTAB(c)) {
					break;
				}
			}

			*tok++ = *src++;	/* record the character */
		}
	}

	/* scan past any whitespace remaining in the source string */
	while (isSPorTAB(*src))
		++src;
	token_ended_line = isreturn(*src) || *src == EOS;

	*tok = EOS;
	return src;
}

/*
 * Convert the string 'src' into a string that we can read back with 'token()'.
 * If it is a shell-command, this will be a single-token.  Repeated shift
 * commands are multiple tokens.
 */
int
macroize(
TBUFF	**p,
TBUFF *	src,
int	skip)
{
	register int	c;
	char	*ref	= tb_values(src); /* FIXME */
	int	multi	= !isShellOrPipe(ref);	/* shift command? */
	int	count	= 0;

	if (tb_init(p, abortc) != 0) {
		ALLOC_T	n, len = tb_length(src);
		char	*txt = tb_values(src);

		TRACE(("macroizing %s\n", tb_visible(src)))
		(void)tb_append(p, '"');
		for (n = skip; n < len; n++) {
			c = txt[n];
			if (multi && count++)
				(void)tb_sappend(p, "\" \"");
			if (c == '\\' || c == '"')
				(void)tb_append(p, '\\');
			(void)tb_append(p, c);
		}
		(void)tb_append(p, '"');
		TRACE(("macroized %s\n", tb_visible(*p)))
		return (tb_append(p, EOS) != 0);
	}
	return FALSE;
}

int
macarg(		/* get a macro line argument */
char *tok)	/* buffer to place argument */
{
	int savcle;	/* buffer to store original clexec */

	savcle = clexec;	/* save execution mode */
	clexec = TRUE;		/* get the argument */
	/* grab token and advance past */
	execstr = token(execstr, tok, EOS);
	/* evaluate it */
	(void)strcpy(tok, tokval(tok));
	clexec = savcle;	/* restore execution mode */
	return TRUE;
}

int
macliteralarg(	/* get a macro line argument */
TBUFF **tok)	/* buffer to place argument */
{
	/* grab everything on this line, literally */
	(void)tb_scopy(tok, execstr);
	execstr += strlen(execstr);
	token_ended_line = TRUE;
	return TRUE;
}

/*	storemac:	Set up a macro buffer and flag to store all executed
			command lines there. 'n' is the macro number to use
 */

int
storemac(int f, int n)
{
	register struct BUFFER *bp;	/* pointer to macro buffer */
	char bname[NBUFN];		/* name of buffer to use */

	/* must have a numeric argument to this function */
	if (f == FALSE) {
		mlforce("[No macro specified]");
		return FALSE;
	}

	/* range check the macro number */
	if (n < 1 || n > 40) {
		mlforce("[Macro number out of range]");
		return FALSE;
	}

	/* construct the macro buffer name */
	(void)lsprintf(bname, MACRO_N_BufName, n);

	/* set up the new macro buffer */
	if ((bp = bfind(bname, BFINVS)) == NULL) {
		mlforce("[Cannot create macro]");
		return FALSE;
	}

	/* and make sure it is empty */
	if (!bclear(bp))
		return FALSE;

	set_rdonly(bp, bp->b_fname, MDVIEW);

	/* and set the macro store pointers to it */
	mstore = TRUE;
	bstore = bp;
	return TRUE;
}

#if	OPT_PROCEDURES
/*	storeproc:	Set up a procedure buffer and flag to store all
			executed command lines there.  'n' is the macro number
			to use.
 */

int
storeproc(int f, int n)
{
	static TBUFF *name;		/* procedure name */
#if OPT_ONLINEHELP
	static TBUFF *helpstring;	/* optional help string */
#endif
	register struct BUFFER *bp;	/* pointer to macro buffer */
	register int status;		/* return status */
	char bname[NBUFN];		/* name of buffer to use */

	/* a numeric argument means its a numbered macro */
	if (f == TRUE)
		return storemac(f, n);

	/* get the name of the procedure */
	tb_scopy(&name, "");
	if ((status = kbd_reply("Procedure name: ", &name,
	    eol_history, ' ', KBD_NORMAL, no_completion)) != TRUE)
		return status;

#if OPT_ONLINEHELP
	/* get optional help string */
	if (more_named_cmd())
	{
	    tb_scopy(&helpstring, "");
	    if ((status = kbd_reply("help info: ", &helpstring,
		eol_history, '\n', KBD_NORMAL, no_completion)) != TRUE)
		    return status;
	}
	else
	    tb_scopy(&helpstring, "User-defined procedure");
#endif

	/* construct the macro buffer name */
	add_brackets(bname, tb_values(name));

	/* set up the new macro buffer */
	if ((bp = bfind(bname, BFINVS)) == NULL) {
		mlforce("[Cannot create procedure]");
		return FALSE;
	}

	/* and make sure it is empty */
	if (!bclear(bp))
		return FALSE;

	set_rdonly(bp, bp->b_fname, MDVIEW);

	/* save this into the list of : names */
#if OPT_NAMEBST
	{
	    CMDFUNC *cf = typealloc(CMDFUNC);

	    if (!cf)
		return no_memory("registering procedure name");

#if CC_CANNOT_INIT_UNIONS
	    cf->c_union = (void *)bp;
#else
	    cf->cu.c_buff = bp;
#endif
	    cf->c_flags = UNDO|REDO|CMD_PROC|VIEWOK;
#if OPT_ONLINEHELP
	    cf->c_help = strmalloc(tb_values(helpstring));
#endif

	    if (insert_namebst(tb_values(name), cf, FALSE) != TRUE)
		return FALSE;
	}
#endif /* OPT_NAMEBST */

	/* and set the macro store pointers to it */
	mstore = TRUE;
	bstore = bp;
	return TRUE;
}

/*	execproc:	Execute a procedure				*/

int
execproc(int f, int n)
{
	static char name[NBUFN];	/* name of buffer to execute */
	int status;

	/* find out what buffer the user wants to execute */
	if ((status = mlreply("Execute procedure: ",
					name, sizeof(name))) != TRUE) {
		return status;
	}

	status = TRUE;
	if (!f)
		n = 1;

	while (status == TRUE && n--)
		status = run_procedure(name);

	return status;

}

int
run_procedure(const char *name)
{
	register BUFFER *bp;		/* ptr to buffer to execute */
	register int status;		/* status return */
	char bufn[NBUFN];		/* name of buffer to execute */
	register int odiscmd;

	if (!*name)
		return FALSE;

	/* construct the buffer name */
	add_brackets(bufn, name);

	/* find the pointer to that buffer */
	if ((bp = find_b_name(bufn)) == NULL) {
		return FALSE;
	}

	odiscmd = discmd;
	discmd = FALSE;

	status = dobuf(bp);

	discmd = odiscmd;
	return status;
}
#endif

#if ! SMALLER
/*	execbuf:	Execute the contents of a buffer of commands	*/

int
execbuf(int f, int n)
{
	register BUFFER *bp;		/* ptr to buffer to execute */
	register int status;		/* status return */
	static char bufn[NBUFN];	/* name of buffer to execute */
	register int odiscmd;

	if (!f)
		n = 1;

	/* find out what buffer the user wants to execute */
	if ((status = mlreply("Execute buffer: ", bufn, sizeof(bufn))) != TRUE)
		return status;

	/* find the pointer to that buffer */
	if ((bp = find_b_name(bufn)) == NULL) {
		mlforce("[No such buffer \"%s\"]",bufn);
		return FALSE;
	}

	odiscmd = discmd;
	discmd = FALSE;
	status = TRUE;
	/* and now execute it as asked */
	while (n-- > 0 && status == TRUE)
		status = dobuf(bp);

	discmd = odiscmd;

	return status;
}
#endif

/*	dobuf:	execute the contents of the buffer pointed to
		by the passed BP

	Directives start with a "~" and include:

	~endm		End a macro
#if !SMALLER
	~if (cond)	conditional execution
	~else
	~endif
	~return		Return (terminating current macro)
	~goto <label>	Jump to a label in the current macro
	~force		Force macro to continue...even if command fails
	~while (cond)	Execute a loop if the condition is true
	~endwhile

	Line Labels begin with a "*" as the first nonblank char, like:

	*LBL01
#endif

*/

static void
freewhile(	/* free a list of while block pointers */
WHBLOCK *wp)	/* head of structure to free */
{
	if (wp == NULL)
		return;
	if (wp->w_next)
		freewhile(wp->w_next);
	free((char *)wp);
}

#define DIRECTIVE_CHAR '~'

#if ! SMALLER
#define DDIR_FAILED     -1
#define DDIR_COMPLETE    0
#define DDIR_INCOMPLETE  1
#define DDIR_FORCE       2

static DIRECTIVE
dname_to_dirnum(const char *eline, size_t length)
{
	DIRECTIVE dirnum = D_UNKNOWN;
	if (*eline++ == DIRECTIVE_CHAR) {
		size_t n, m;
		for (n = 0; n < TABLESIZE(dname); n++) {
			m = strlen(dname[n].name);
			if (length >= m
			 && memcmp(eline, dname[n].name, m) == 0) {
				dirnum = dname[n].type;
				break;
			}
		}
	}
	return dirnum;
}

static const char *
dirnum_to_name(DIRECTIVE dirnum)
{
	size_t n;
	for (n = 0; n < TABLESIZE(dname); n++)
		if (dname[n].type == dirnum)
			return dname[n].name;
	return "?";
}

static int
unbalanced_directive(DIRECTIVE dirnum)
{
	mlforce("[Unexpected directive: %s]", dirnum_to_name(dirnum));
	return DDIR_FAILED;
}

static int
begin_directive(
	char **const eline,
	DIRECTIVE dirnum,
	WHBLOCK *whlist,
	BUFFER *bp,
	LINEPTR *lp)
{
	int status = DDIR_COMPLETE; /* assume directive is self-contained */
	WHBLOCK *wht;		/* temporary ptr to a WHBLOCK */
	char tkn[NSTRING];	/* buffer to evaluate an expression in */
	const char *old_execstr = execstr;

	execstr = *eline;

	switch (dirnum) {
	case D_IF:	/* IF directive */
		/* grab the value of the logical exp */
		ifstk.level++;
		if (!ifstk.disabled) {
			ifstk.fired = FALSE;
			ifstk.disabled = ifstk.level;
			if (macarg(tkn) != TRUE)
				status = DDIR_INCOMPLETE;
			else if (stol(tkn) == TRUE) {
				ifstk.disabled = 0;
				ifstk.fired = TRUE;
			}
		}
		break;

	case D_WHILE:	/* WHILE directive */
		/* grab the value of the logical exp */
		if (!ifstk.disabled) {
			if (macarg(tkn) != TRUE) {
				status = DDIR_INCOMPLETE;
				break;
			} else if (stol(tkn) == TRUE) {
				break;
			}
		}
		/* drop down and act just like BREAK */

		/* FALLTHRU */
	case D_BREAK:	/* BREAK directive */
		if (dirnum != D_BREAK || !ifstk.disabled) {

			/* Jump down to the endwhile, then find the right while
			 * loop.
			 */
			for (wht = whlist; wht != 0; wht = wht->w_next) {
				if (wht->w_begin == *lp)
					break;
			}

			if (wht == 0) {
				status = unbalanced_directive(dirnum);
			} else { /* reset the line pointer back.. */
				*lp = wht->w_end;
			}
		}
		break;

	case D_ELSEIF:	/* ELSEIF directive */
		if (ifstk.level == 0) {
			status = unbalanced_directive(dirnum);
		} else {
			if (ifstk.fired) {
				if (!ifstk.disabled)
					ifstk.disabled = ifstk.level;
			} else if (macarg(tkn) != TRUE) {
				status = DDIR_INCOMPLETE;
			} else if (!ifstk.fired
			  && ifstk.disabled == ifstk.level
			  && (stol(tkn) == TRUE)) {
				ifstk.disabled = 0;
				ifstk.fired = TRUE;
			}
		}
		break;

	case D_ELSE:	/* ELSE directive */
		if (ifstk.level == 0) {
			status = unbalanced_directive(dirnum);
		} else {
			if (ifstk.fired) {
				if (!ifstk.disabled)
					ifstk.disabled = ifstk.level;
			} else if (ifstk.disabled == ifstk.level) {
				ifstk.disabled = 0;
				ifstk.fired = TRUE;
			}
		}
		break;

	case D_ENDIF:	/* ENDIF directive */
		if (ifstk.level == 0) {
			status = unbalanced_directive(dirnum);
		} else {
			ifstk.level--;
			if (ifstk.disabled > ifstk.level)
			{
				ifstk.disabled = 0;
				ifstk.fired = TRUE;
			}
		}
		break;

	case D_GOTO:	/* GOTO directive */
		/* .....only if we are currently executing */
		if (!ifstk.disabled) {
			register LINEPTR glp;	/* line to goto */

			/* grab label to jump to */
			*eline = (char *)token(*eline, golabel, EOS);
			glp = label2lp(bp, golabel);
			if (glp == 0) {
				mlforce("[No such label \"%s\"]", golabel);
				status = DDIR_FAILED;
			} else {
				*lp = glp;
			}
		}
		break;

	case D_RETURN:	/* RETURN directive */
		if (!ifstk.disabled)
			status = DDIR_INCOMPLETE;
		break;

	case D_ENDWHILE: /* ENDWHILE directive */
		if (!ifstk.disabled) {
			/* find the right while loop */
			for (wht = whlist; wht != 0; wht = wht->w_next) {
				if (wht->w_type == D_WHILE
				 && wht->w_end == *lp)
					break;
			}

			if (wht == 0) {
				status = unbalanced_directive(dirnum);
			} else { /* reset the line pointer back.. */
				*lp = lback(wht->w_begin);
			}
		}
		break;

	case D_FORCE:	/* FORCE directive */
		status = DDIR_FORCE;
		break;

	case D_UNKNOWN:
	case D_ENDM:
		break;
	}
	execstr = old_execstr;
	return status;
}

static WHBLOCK *
alloc_WHBLOCK(WHBLOCK *scanpt, DIRECTIVE dirnum, LINEPTR lp)
{
	WHBLOCK *whtemp;	/* temporary ptr to a WHBLOCK */

	if ((whtemp = typealloc(WHBLOCK)) == 0) {
		mlforce("[Out of memory during '%s' scan]",
			dirnum_to_name(dirnum));
		freewhile(scanpt);
		return 0;
	}
	whtemp->w_begin = lp;
	whtemp->w_type = dirnum;
	whtemp->w_next = scanpt;
	scanpt = whtemp;
	return scanpt;
}

static int
setup_dobuf(BUFFER *bp, WHBLOCK **result)
{
	int status = TRUE;
	LINEPTR lp;		/* pointer to line to execute */
	char *eline;		/* text of line to execute */
	WHBLOCK *scanpt = 0;	/* ptr during scan */
	WHBLOCK *whtemp;	/* temporary ptr to a WHBLOCK */

	/* scan the buffer to execute, building WHILE header blocks */
	bp->b_dot.o = 0;
	*result = 0;
	for_each_line(lp, bp) {
		int i;			/* index */

		bp->b_dot.l = lp;
		/* scan the current line */
		eline = lp->l_text;
		i = lp->l_used;

		/* trim leading whitespace */
		while (i-- > 0 && isBlank(*eline))
			++eline;

		/* if there's nothing here, don't bother */
		if (i <= 0)
			continue;

		switch (dname_to_dirnum(eline, (size_t)i)) {
		/* if is a while directive, make a block... */
		case D_WHILE:
			if ((scanpt = alloc_WHBLOCK(scanpt, D_WHILE, lp)) == 0) {
				status = FALSE;
			}
			break;

		/* if it is a break directive, make a block... */
		case D_BREAK:
			if ((scanpt = alloc_WHBLOCK(scanpt, D_BREAK, lp)) == 0) {
				status = FALSE;
			}
			break;

		/* if it is an endwhile directive, record the spot... */
		case D_ENDWHILE:
			if (scanpt == NULL) {
				mlforce("[%s with no preceding %s in '%s']",
					dirnum_to_name(D_ENDWHILE),
					dirnum_to_name(D_WHILE),
					bp->b_bname);
				status = FALSE;
			}
			/* Move top records from the scanpt list to the result
			 * until we have moved all BREAK records and one WHILE
			 * record.
			 */
			do {
				scanpt->w_end = lp;
				whtemp  = *result;
				*result = scanpt;
				scanpt  = scanpt->w_next;
				(*result)->w_next = whtemp;
			} while ((*result)->w_type == D_BREAK);
			break;

		/* nothing else requires attention */
		default:
			break;
		}
		if (status != TRUE)
			break;
	}

	/* while and endwhile should match! */
	if (status == TRUE && scanpt != NULL) {
		mlforce("[%s with no matching %s in '%s']",
			dirnum_to_name(D_WHILE),
			dirnum_to_name(D_ENDWHILE),
			bp->b_bname);
		status = FALSE;
	}
	return status;	/* true iff we made it to the end w/o errors */
}
#else
#define dname_to_dirnum(eline,length) \
		(eline[0] == DIRECTIVE_CHAR && !strcmp(eline+1, "endm") \
		? D_ENDM \
		: D_UNKNOWN)
#endif

#if OPT_TRACE && !SMALLER
static const char *TraceIndent(int level, const char *eline, size_t length)
{
	static	const char indent[] = ".  .  .  .  .  .  .  .  ";
	switch (dname_to_dirnum(eline, length)) {
	case D_ELSE:	/* FALLTHRU */
	case D_ELSEIF:	/* FALLTHRU */
	case D_ENDIF:
		if (level > 0)
			level--;
		break;
	default:
		break;
	}
	level = strlen(indent) - (3 * level);
	if (level < 0)
		level = 0;
	return &indent[level];
}
#define TRACE_INDENT(level, eline) TraceIndent(level, eline, linlen)
#else
#define TRACE_INDENT(level, eline) "" /* nothing */
#endif

static int
perform_dobuf(BUFFER *bp, WHBLOCK *whlist)
{
	int status = TRUE;
	int glue = 0;		/* nonzero to append lines */
	LINEPTR lp;		/* pointer to line to execute */
	DIRECTIVE dirnum;	/* directive index */
	size_t linlen;		/* length of line to execute */
	int force;		/* force TRUE result? */
	WINDOW *wp;		/* ptr to windows to scan */
	char *einit = 0;	/* initial value of eline */
	char *eline;		/* text of line to execute */

	static BUFFER *dobuferrbp;

	/* starting at the beginning of the buffer */
	for_each_line(lp, bp) {
		bp->b_dot.l = lp;
		/* allocate eline and copy macro line to it */

		if (lp->l_used <= 0)
			linlen = 0;
		else
			linlen = lp->l_used;

		if (glue) {
			if ((einit = castrealloc(char, einit, glue+linlen+1)) == 0) {
				status = no_memory("during macro execution");
				break;
			}
			eline = einit + glue;
			glue  = 0;
		} else {
			if (einit != 0)
				free(einit);

			if ((einit = eline = castalloc(char, linlen+1)) == 0) {
				status = no_memory("during macro execution");
				break;
			}
		}

		if (linlen != 0)
			(void)strncpy(eline, lp->l_text, linlen);
		eline[linlen] = EOS;	/* make sure it ends */

		/* trim leading whitespace from each line */
		{
			char *src = eline;
			char *dst = eline;
			while (isBlank(*src))
				src++;
			while ((*dst++ = *src++) != EOS)
				;
			linlen -= (size_t)(src - dst);
		}

		/*
		 * If the last character on the line is a backslash, glue the
		 * following line to the one we're processing.
		 */
		if (lforw(lp) != buf_head(bp)
		 && linlen != 0
		 && eline[linlen-1] == '\\') {
			glue = linlen + (size_t)(eline - einit) - 1;
			continue;
		}
		eline = einit;
		while (isBlank(*eline))
			++eline;

		/* Skip comments and blank lines.
		 * ';' for uemacs backward compatibility, and
		 * '"' for vi compatibility
		 */
		if (*eline == ';'
		 || *eline == '"'
		 || *eline == EOS)
			continue;

#if	OPT_DEBUGMACROS
		/* if $debug == TRUE, every line to execute
		   gets echoed and a key needs to be pressed to continue
		   ^G will abort the command */

		if (macbug) {
			char	outline[NLINE];
			(void)strcpy(outline, "<<<");

			/* debug macro name */
			(void)strcat(outline, bp->b_bname);
			(void)strcat(outline, ":");

			/* debug if levels */
			(void)strcat(outline, l_itoa(ifstk.level));
			(void)strcat(outline, "/");
			(void)strcat(outline, l_itoa(ifstk.disabled));
			(void)strcat(outline, ":");

			/* and lastly the line */
			(void)strcat(outline, eline);
			(void)strcat(outline, ">>>");

			/* write out the debug line */
			mlforce("%s",outline);
			(void)update(TRUE);

			/* and get the keystroke */
			if (ABORTED(keystroke())) {
				mlforce("[Macro aborted]");
				status = FALSE;
				break;
			}
		}
#endif
		TRACE(("<<<%s%s:%d/%d%c%s%s>>>\n",
			(bp == curbp) ? "*" : "",
			bp->b_bname, ifstk.level, ifstk.disabled,
			ifstk.fired ? '+' : ' ',
			TRACE_INDENT(ifstk.level, eline),
			eline))

		/* Parse directives here.... */
		dirnum = D_UNKNOWN;
		if (*eline == DIRECTIVE_CHAR) {

			/* Find out which directive this is */
			dirnum = dname_to_dirnum(eline, linlen);

			/* and bitch if it's illegal */
			if (dirnum == D_UNKNOWN) {
				mlforce("[Unknown directive \"%s\"]", eline);
				status = FALSE;
				break;
			}

			/* service only the ENDM macro here */
			if (dirnum == D_ENDM && !ifstk.disabled) {
				if (!mstore) {
					mlforce(
					"[No macro definition in progress]");
					status = FALSE;
					break;
				}
				bstore->b_dot.l = lforw(buf_head(bstore));
				bstore->b_dot.o = 0;
				bstore = NULL;
				mstore = FALSE;
				continue;
			}
		}

		/* if macro store is on, just salt this away */
		if (mstore) {
			/* allocate the space for the line */
			if (addline(bstore, eline, -1) == FALSE) {
				mlforce("[Out of memory while storing macro]");
				status = FALSE;
				break;
			}
			continue;
		}

		if (*eline == '*')
			continue;

		force = FALSE;

#if ! SMALLER
		/* now, execute directives */
		if (dirnum != D_UNKNOWN) {
			int code;

			/* skip past the directive */
			while (*eline && !isBlank(*eline))
				++eline;
			code = begin_directive(&eline, dirnum, whlist, bp, &lp);
			if (code == DDIR_FAILED) {
				status = FALSE;
				break;
			} else if (code == DDIR_COMPLETE) {
				continue;
			} else if (code == DDIR_INCOMPLETE) {
				status = TRUE; /* not exactly an error */
				break;
			} else if (code == DDIR_FORCE) {
				force = TRUE;
			}
		}
#endif

		/* execute the statement */
		/* if we are scanning and not executing..go back here */
		if (ifstk.disabled)
			status = TRUE;
		else
			status = docmd(eline,TRUE,FALSE,1);
		if (force)		/* force the status */
			status = TRUE;

		/* check for a command error */
		if (status != TRUE) {
			/* look if buffer is showing */
			for_each_visible_window(wp) {
				if (wp->w_bufp == bp) {
					/* and point it */
					wp->w_dot.l = lp;
					wp->w_dot.o = 0;
					wp->w_flag |= WFHARD;
				}
			}
			/* in any case set the buffer's dot */
			bp->b_dot.l = lp;
			bp->b_dot.o = 0;
			bp->b_wline.l = lforw(buf_head(bp));
			if (dobuferrbp == NULL) {
				dobuferrbp = bp;
				(void)swbuffer(bp);
				kbd_alarm();
			}
			break;
		}
	}

	if (einit != 0)
		free(einit);

	return status;
}

int
dobuf(BUFFER *bp)	/* buffer to execute */
{
	int status = FALSE;	/* status return */
	WHBLOCK *whlist;	/* ptr to WHILE list */

	static int dobufnesting; /* flag to prevent runaway recursion */

	if (++dobufnesting < 9) {

#if ! SMALLER
		if (setup_dobuf(bp, &whlist) != TRUE) {
			status = FALSE;
		} else
#else
		whlist = NULL;
#endif
		{
			static const IFSTK new_ifstk = {0,0,0}; /* all 0's */
			const CMDFUNC *save_havemotion  = havemotion;
			IFSTK save_ifstk;
			REGIONSHAPE save_regionshape = regionshape;

			save_ifstk  = ifstk;
			ifstk       = new_ifstk;
			havemotion  = NULL;
			regionshape = EXACT;

			status = perform_dobuf(bp, whlist);

			ifstk       = save_ifstk;
			havemotion  = save_havemotion;
			regionshape = save_regionshape;
		}

		mstore = FALSE;
		freewhile(whlist);
	}
	dobufnesting--;

	return status;
}


/*
 * Common function for startup-file, and for :so command.
 */
int
do_source(char *fname, int n, int optional)
{
	register int status;	/* return status of name query */
	char *fspec;		/* full file spec */

	/* look up the path for the file */
	fspec = flook(fname,
#if SYS_MSDOS || SYS_WIN31 || SYS_OS2 || SYS_WINNT
		FL_ANYWHERE | FL_READABLE
#else
		FL_HERE | FL_HOME | FL_TABLE | FL_READABLE
#endif
		);

	/* if it isn't around */
	if (fspec == NULL)
		return optional ? TRUE : no_such_file(fname);

	/* otherwise, execute it */
	while (n-- > 0)
		if ((status=dofile(fspec)) != TRUE)
			return status;

	return TRUE;
}

#if ! SMALLER
/* ARGSUSED */
int
execfile(	/* execute a series of commands in a file */
int f GCC_UNUSED, int n)	/* default flag and numeric arg to pass on to file */
{
	register int status;
	char fname[NFILEN];	/* name of file to execute */
	static	TBUFF	*last;

	if ((status = mlreply_file("File to execute: ", &last, FILEC_READ, fname)) != TRUE)
		return status;

	return do_source(fname, n, FALSE);
}
#endif

static L_NUM
get_b_lineno(BUFFER *bp)
{
	L_NUM result;
	WINDOW *wp;

	/* try to save the original location, so we can restore it */
	if (curwp->w_bufp == bp)
		result = line_no(bp, curwp->w_dot.l);
	else if ((wp = bp2any_wp(bp)) != 0)
		result = line_no(bp, wp->w_dot.l);
	else
		result = line_no(bp, bp->b_dot.l);
	return result;
}

static void
set_b_lineno(BUFFER *bp, L_NUM n)
{
	WINDOW *wp;
	LINE *lp;

	for_each_line(lp,bp) {
		if (--n <= 0) {
			bp->b_dot.l = lp;
			bp->b_dot.o = 0;
			for_each_visible_window(wp) {
				if (wp->w_bufp == bp) {
					wp->w_dot = bp->b_dot;
					wp->w_flag |= WFMOVE;
				}
			}
			break;
		}
	}
}

/*	dofile:	yank a file into a buffer and execute it
		if there are no errors, delete the buffer on exit */

int
dofile(
char *fname)		/* file name to execute */
{
	register BUFFER *bp;	/* buffer to place file to execute */
	register int status;	/* results of various calls */
	register int odiscmd;
	int clobber = FALSE;
	int original;

	/*
	 * Check first for the name, assuming it's a filename.  If we don't
	 * find an existing buffer with that filename, create a buffer.
	 */
	if ((bp = find_b_file(fname)) == 0) {
		if ((bp = make_bp(fname, 0)) == 0)
			return FALSE;
		clobber = TRUE;
	}
	bp->b_flag = BFEXEC;

	/* try to save the original location, so we can restore it */
	original = get_b_lineno(bp);

	/* and try to read in the file to execute */
	if ((status = readin(fname, FALSE, bp, TRUE)) == TRUE) {

		/* go execute it! */
		odiscmd = discmd;
		discmd = FALSE;
		status = dobuf(bp);
		discmd = odiscmd;

		/*
		 * If no errors occurred, and if the buffer isn't displayed,
		 * remove it, unless it was loaded before we entered this
		 * function.  In that case, (try to) jump back to the original
		 * location.
		 */
		if (status != TRUE)
			(void)swbuffer(bp);
		else if ((bp->b_nwnd == 0) && clobber)
			(void)zotbuf(bp);
		else
			set_b_lineno(bp,original);
	}
	return status;
}

/*	cbuf:	Execute the contents of a numbered buffer	*/

static int
cbuf(
int f, int n,	/* default flag and numeric arg */
int bufnum)	/* number of buffer to execute */
{
	register BUFFER *bp;		/* ptr to buffer to execute */
	register int status;		/* status return */
	static char bufname[NBUFN];
	register int odiscmd;

	if (!f) n = 1;

	/* make the buffer name */
	(void)lsprintf(bufname, MACRO_N_BufName, bufnum);

	/* find the pointer to that buffer */
	if ((bp = find_b_name(bufname)) == NULL) {
		mlforce("[Macro %d not defined]", bufnum);
		return FALSE;
	}

	odiscmd = discmd;
	discmd = FALSE;
	status = TRUE;
	/* and now execute it as asked */
	while (n-- > 0 && status == TRUE)
		status = dobuf(bp);

	discmd = odiscmd;
	return status;

}

#include "neexec.h"
