/usr/src/usr.bin/vi/build/../ex/ex.c

Bug Summary

File:	src/usr.bin/vi/build/../ex/ex.c
Warning:	line 2158, column 29 Use of memory after it is freed
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ex.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/vi/build/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/usr.bin/vi/build -I /usr/src/usr.bin/vi/build/../include -I . -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.bin/vi/build/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.bin/vi/build/../ex/ex.c
1/*	$OpenBSD: ex.c,v 1.21 2016/03/19 00:21:28 mestre Exp $	*/

3/*-
* Copyright (c) 1992, 1993, 1994
*	The Regents of the University of California.  All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
*	Keith Bostic.  All rights reserved.
*
* See the LICENSE file for redistribution information.
*/

12#include "config.h"

14#include <sys/types.h>
15#include <sys/queue.h>
16#include <sys/stat.h>
17#include <sys/time.h>

19#include <bitstring.h>
20#include <ctype.h>
21#include <errno(*__errno()).h>
22#include <fcntl.h>
23#include <limits.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <unistd.h>

29#include "../common/common.h"
30#include "../vi/vi.h"

32#if defined(DEBUG) && defined(COMLOG)
33static void	ex_comlog(SCR *, EXCMD *);
34#endif
35static EXCMDLIST const *
ex_comm_search(char *, size_t);
37static int	ex_discard(SCR *);
38static int	ex_line(SCR *, EXCMD *, MARK *, int *, int *);
39static int	ex_load(SCR *);
40static void	ex_unknown(SCR *, char *, size_t);

42/*
* ex --
*	Main ex loop.
*
* PUBLIC: int ex(SCR **);
*/
48int
49ex(SCR **spp)
50{
GS *gp;
MSGS *mp;
SCR *sp;
TEXT *tp;
u_int32_t flags;

sp = *spp;
gp = sp->gp;

/* Start the ex screen. */
if (ex_init(sp))
return (1);

/* Flush any saved messages. */
while ((mp = LIST_FIRST(&gp->msgq)((&gp->msgq)->lh_first)) != NULL((void *)0)) {
gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
LIST_REMOVE(mp, q)do { if ((mp)->q.le_next != ((void *)0)) (mp)->q.le_next
->q.le_prev = (mp)->q.le_prev; *(mp)->q.le_prev = (mp
)->q.le_next; ; ; } while (0);
free(mp->buf);
free(mp);
}

/* If reading from a file, errors should have name and line info. */
if (F_ISSET(gp, G_SCRIPTED)(((gp)->flags) & ((0x0010)))) {
gp->excmd.if_lno = 1;
gp->excmd.if_name = "script";
}

/*
* !!!
* Initialize the text flags.  The beautify edit option historically
* applied to ex command input read from a file.  In addition, the
* first time a ^H was discarded from the input, there was a message,
* "^H discarded", that was displayed.  We don't bother.
*/
LF_INIT(TXT_BACKSLASH | TXT_CNTRLD | TXT_CR)(flags) = ((0x00000020 | 0x00000200 | 0x00000800));
for (;; ++gp->excmd.if_lno) {
/* Display status line and flush. */
if (F_ISSET(sp, SC_STATUS)(((sp)->flags) & ((0x02000000)))) {
	if (!F_ISSET(sp, SC_EX_SILENT)(((sp)->flags) & ((0x00040000))))
		msgq_status(sp, sp->lno, 0);
	F_CLR(sp, SC_STATUS)(((sp)->flags) &= ~((0x02000000)));
}
(void)ex_fflush(sp);

/* Set the flags the user can reset. */
if (O_ISSET(sp, O_BEAUTIFY)((((&(((sp)))->opts[(((O_BEAUTIFY)))])->flags) &
 ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_BEAUTIFY
)))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_BEAUTIFY))
)].o_cur.val))
	LF_SET(TXT_BEAUTIFY)((flags) |= ((0x00000040)));
if (O_ISSET(sp, O_PROMPT)((((&(((sp)))->opts[(((O_PROMPT)))])->flags) & (
(0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_PROMPT
)))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_PROMPT)))]
.o_cur.val))
	LF_SET(TXT_PROMPT)((flags) |= ((0x00400000)));

/* Clear any current interrupts, and get a command. */
CLR_INTERRUPT(sp)((((sp)->gp)->flags) &= ~((0x0004)));
if (ex_txt(sp, &sp->tiq, ':', flags))
	return (1);
if (INTERRUPTED(sp)(((((sp)->gp)->flags) & ((0x0004))) || (!v_event_get
((sp), ((void *)0), 0, 0x001) && ((((sp)->gp)->
flags) & ((0x0004)))))) {
	(void)ex_puts(sp, "\n");
	(void)ex_fflush(sp);
	continue;
}

/* Initialize the command structure. */
CLEAR_EX_PARSER(&gp->excmd)memset(&((&gp->excmd)->cp), 0, ((char *)&(&
gp->excmd)->flags - (char *)&((&gp->excmd)->
cp)) + sizeof((&gp->excmd)->flags));

/*
 * If the user entered a single carriage return, send
 * ex_cmd() a separator -- it discards single newlines.
 */
tp = TAILQ_FIRST(&sp->tiq)((&sp->tiq)->tqh_first);
if (tp->len == 0) {
	gp->excmd.cp = " ";	/* __TK__ why not |? */
	gp->excmd.clen = 1;
} else {
	gp->excmd.cp = tp->lb;
	gp->excmd.clen = tp->len;
}
F_INIT(&gp->excmd, E_NRSEP)((&gp->excmd)->flags) = ((0x00008000));

if (ex_cmd(sp) && F_ISSET(gp, G_SCRIPTED)(((gp)->flags) & ((0x0010))))
	return (1);

if (INTERRUPTED(sp)(((((sp)->gp)->flags) & ((0x0004))) || (!v_event_get
((sp), ((void *)0), 0, 0x001) && ((((sp)->gp)->
flags) & ((0x0004)))))) {
	CLR_INTERRUPT(sp)((((sp)->gp)->flags) &= ~((0x0004)));
	msgq(sp, M_ERR, "Interrupted");
}

/*
 * If the last command caused a restart, or switched screens
 * or into vi, return.
 */
if (F_ISSET(gp, G_SRESTART)(((gp)->flags) & ((0x0080))) || F_ISSET(sp, SC_SSWITCH | SC_VI)(((sp)->flags) & ((0x00001000 | 0x00000002)))) {
	*spp = sp;
	break;
}

/* If the last command switched files, we don't care. */
F_CLR(sp, SC_FSWITCH)(((sp)->flags) &= ~((0x00000800)));

/*
 * If we're exiting this screen, move to the next one.  By
 * definition, this means returning into vi, so return to the
 * main editor loop.  The ordering is careful, don't discard
 * the contents of sp until the end.
 */
if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE)(((sp)->flags) & ((0x00000200 | 0x00000400)))) {
	if (file_end(sp, NULL((void *)0), F_ISSET(sp, SC_EXIT_FORCE)(((sp)->flags) & ((0x00000400)))))
		return (1);
	*spp = screen_next(sp);
	return (screen_end(sp));
}
}
return (0);
162}

164/*
* ex_cmd --
*	The guts of the ex parser: parse and execute a string containing
*	ex commands.
*
* !!!
* This code MODIFIES the string that gets passed in, to delete quoting
* characters, etc.  The string cannot be readonly/text space, nor should
* you expect to use it again after ex_cmd() returns.
*
* !!!
* For the fun of it, if you want to see if a vi clone got the ex argument
* parsing right, try:
*
*	echo 'foo|bar' > file1; echo 'foo/bar' > file2;
*	vi
*	:edit +1|s/|/PIPE/|w file1| e file2|1 | s/\//SLASH/|wq
*
* or:	vi
*	:set|file|append|set|file
*
* For extra credit, try them in a startup .exrc file.
*
* PUBLIC: int ex_cmd(SCR *);
*/
189int
190ex_cmd(SCR *sp)
191{
enum nresult nret;
EX_PRIVATE *exp;
EXCMD *ecp;
GS *gp;
MARK cur;
recno_t lno;
size_t arg1_len, discard, len;
u_int32_t flags;
long ltmp;
int at_found, gv_found;
int ch, cnt, delim, isaddr, namelen;
int newscreen, notempty, tmp, vi_address;
char *arg1, *p, *s, *t;

gp = sp->gp;
exp = EXP(sp)((EX_PRIVATE *)((sp)->ex_private));

/*
* We always start running the command on the top of the stack.
* This means that *everything* must be resolved when we leave
* this function for any reason.
*/
214loop:	ecp = LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first);

/* If we're reading a command from a file, set up error information. */
if (ecp->if_name != NULL((void *)0)) {
1
Assuming field 'if_name' is equal to NULL→
2
←
Taking false branch→
gp->if_lno = ecp->if_lno;
gp->if_name = ecp->if_name;
}

/*
* If a move to the end of the file is scheduled for this command,
* do it now.
*/
if (F_ISSET(ecp, E_MOVETOEND)(((ecp)->flags) & ((0x00400000)))) {
3
←
Assuming the condition is false→
4
←
Taking false branch→
if (db_last(sp, &sp->lno))
	goto rfail;
sp->cno = 0;
F_CLR(ecp, E_MOVETOEND)(((ecp)->flags) &= ~((0x00400000)));
}

/* If we found a newline, increment the count now. */
if (F_ISSET(ecp, E_NEWLINE)(((ecp)->flags) & ((0x00800000)))) {
5
←
Assuming the condition is false→
6
←
Taking false branch→
++gp->if_lno;
++ecp->if_lno;
F_CLR(ecp, E_NEWLINE)(((ecp)->flags) &= ~((0x00800000)));
}

/* (Re)initialize the EXCMD structure, preserving some flags. */
CLEAR_EX_CMD(ecp){ u_int32_t L__f = ((((ecp))->flags) & ((0x0003f800)))
; memset(&((ecp)->buffer), 0, ((char *)&(ecp)->
flags - (char *)&((ecp)->buffer)) + sizeof((ecp)->flags
)); ((((ecp))->flags) |= ((L__f))); };

/* Initialize the argument structures. */
if (argv_init(sp, ecp))
7
←
Assuming the condition is true→
8
←
Taking true branch→
goto err;
9
←
Control jumps to line 1565→

/* Initialize +cmd, saved command information. */
arg1 = NULL((void *)0);
ecp->save_cmdlen = 0;

/* Skip <blank>s, empty lines.  */
for (notempty = 0; ecp->clen > 0; ++ecp->cp, --ecp->clen)
if ((ch = *ecp->cp) == '\n') {
	++gp->if_lno;
	++ecp->if_lno;
} else if (isblank(ch))
	notempty = 1;
else
	break;

/*
* !!!
* Permit extra colons at the start of the line.  Historically,
* ex/vi allowed a single extra one.  It's simpler not to count.
* The stripping is done here because, historically, any command
* could have preceding colons, e.g. ":g/pattern/:p" worked.
*/
if (ecp->clen != 0 && ch == ':') {
notempty = 1;
while (--ecp->clen > 0 && (ch = *++ecp->cp) == ':');
}

/*
* Command lines that start with a double-quote are comments.
*
* !!!
* Historically, there was no escape or delimiter for a comment, e.g.
* :"foo|set was a single comment and nothing was output.  Since nvi
* permits users to escape <newline> characters into command lines, we
* have to check for that case.
*/
if (ecp->clen != 0 && ch == '"') {
while (--ecp->clen > 0 && *++ecp->cp != '\n');
if (*ecp->cp == '\n') {
	F_SET(ecp, E_NEWLINE)(((ecp)->flags) |= ((0x00800000)));
	++ecp->cp;
	--ecp->clen;
}
goto loop;
}

/* Skip whitespace. */
for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) {
ch = *ecp->cp;
if (!isblank(ch))
	break;
}

/*
* The last point at which an empty line can mean do nothing.
*
* !!!
* Historically, in ex mode, lines containing only <blank> characters
* were the same as a single <carriage-return>, i.e. a default command.
* In vi mode, they were ignored.  In .exrc files this was a serious
* annoyance, as vi kept trying to treat them as print commands.  We
* ignore backward compatibility in this case, discarding lines that
* contain only <blank> characters from .exrc files.
*
* !!!
* This is where you end up when you're done a command, i.e. clen has
* gone to zero.  Continue if there are more commands to run.
*/
if (ecp->clen == 0 &&
   (!notempty || F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002))) || F_ISSET(ecp, E_BLIGNORE)(((ecp)->flags) & ((0x00000800))))) {
if (ex_load(sp))
	goto rfail;
ecp = LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first);
if (ecp->clen == 0)
	goto rsuccess;
goto loop;
}

/*
* Check to see if this is a command for which we may want to move
* the cursor back up to the previous line.  (The command :1<CR>
* wants a <newline> separator, but the command :<CR> wants to erase
* the command line.)  If the line is empty except for <blank>s,
* <carriage-return> or <eof>, we'll probably want to move up.  I
* don't think there's any way to get <blank> characters *after* the
* command character, but this is the ex parser, and I've been wrong
* before.
*/
if (F_ISSET(ecp, E_NRSEP)(((ecp)->flags) & ((0x00008000))) &&
   ecp->clen != 0 && (ecp->clen != 1 || ecp->cp[0] != '\004'))
F_CLR(ecp, E_NRSEP)(((ecp)->flags) &= ~((0x00008000)));

/* Parse command addresses. */
if (ex_range(sp, ecp, &tmp))
goto rfail;
if (tmp)
goto err;

/*
* Skip <blank>s and any more colons (the command :3,5:print
* worked, historically).
*/
for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) {
ch = *ecp->cp;
if (!isblank(ch) && ch != ':')
	break;
}

/*
* If no command, ex does the last specified of p, l, or #, and vi
* moves to the line.  Otherwise, determine the length of the command
* name by looking for the first non-alphabetic character.  (There
* are a few non-alphabetic characters in command names, but they're
* all single character commands.)  This isn't a great test, because
* it means that, for the command ":e +cut.c file", we'll report that
* the command "cut" wasn't known.  However, it makes ":e+35 file" work
* correctly.
*
* !!!
* Historically, lines with multiple adjacent (or <blank> separated)
* command separators were very strange.  For example, the command
* |||<carriage-return>, when the cursor was on line 1, displayed
* lines 2, 3 and 5 of the file.  In addition, the command "   |  "
* would only display the line after the next line, instead of the
* next two lines.  No ideas why.  It worked reasonably when executed
* from vi mode, and displayed lines 2, 3, and 4, so we do a default
* command for each separator.
*/
374#define	SINGLE_CHAR_COMMANDS"\004!#&*<=>@~"	"\004!#&*<=>@~"
newscreen = 0;
if (ecp->clen != 0 && ecp->cp[0] != '|' && ecp->cp[0] != '\n') {
if (strchr(SINGLE_CHAR_COMMANDS"\004!#&*<=>@~", *ecp->cp)) {
	p = ecp->cp;
	++ecp->cp;
	--ecp->clen;
	namelen = 1;
} else {
	for (p = ecp->cp;
	    ecp->clen > 0; --ecp->clen, ++ecp->cp)
		if (!isalpha(*ecp->cp))
			break;
	if ((namelen = ecp->cp - p) == 0) {
		msgq(sp, M_ERR, "Unknown command name");
		goto err;
	}
}

/*
 * !!!
 * Historic vi permitted flags to immediately follow any
 * subset of the 'delete' command, but then did not permit
 * further arguments (flag, buffer, count).  Make it work.
 * Permit further arguments for the few shreds of dignity
 * it offers.
 *
 * Adding commands that start with 'd', and match "delete"
 * up to a l, p, +, - or # character can break this code.
 *
 * !!!
 * Capital letters beginning the command names ex, edit,
 * next, previous, tag and visual (in vi mode) indicate the
 * command should happen in a new screen.
 */
switch (p[0]) {
case 'd':
	for (s = p,
	    t = cmds[C_DELETE].name; *s == *t; ++s, ++t);
	if (s[0] == 'l' || s[0] == 'p' || s[0] == '+' ||
	    s[0] == '-' || s[0] == '^' || s[0] == '#') {
		len = (ecp->cp - p) - (s - p);
		ecp->cp -= len;
		ecp->clen += len;
		ecp->rcmd = cmds[C_DELETE];
		ecp->rcmd.syntax = "1bca1";
		ecp->cmd = &ecp->rcmd;
		goto skip_srch;
	}
	break;
case 'E': case 'F': case 'N': case 'P': case 'T': case 'V':
	newscreen = 1;
	p[0] = tolower(p[0]);
	break;
}

/*
 * Search the table for the command.
 *
 * !!!
 * Historic vi permitted the mark to immediately follow the
 * 'k' in the 'k' command.  Make it work.
 *
 * !!!
 * Historic vi permitted any flag to follow the s command, e.g.
 * "s/e/E/|s|sgc3p" was legal.  Make the command "sgc" work.
 * Since the following characters all have to be flags, i.e.
 * alphabetics, we can let the s command routine return errors
 * if it was some illegal command string.  This code will break
 * if an "sg" or similar command is ever added.  The substitute
 * code doesn't care if it's a "cgr" flag or a "#lp" flag that
 * follows the 's', but we limit the choices here to "cgr" so
 * that we get unknown command messages for wrong combinations.
 */
if ((ecp->cmd = ex_comm_search(p, namelen)) == NULL((void *)0))
	switch (p[0]) {
	case 'k':
		if (namelen == 2) {
			ecp->cp -= namelen - 1;
			ecp->clen += namelen - 1;
			ecp->cmd = &cmds[C_K];
			break;
		}
		goto unknown;
	case 's':
		for (s = p + 1, cnt = namelen; --cnt; ++s)
			if (s[0] != 'c' &&
			    s[0] != 'g' && s[0] != 'r')
				break;
		if (cnt == 0) {
			ecp->cp -= namelen - 1;
			ecp->clen += namelen - 1;
			ecp->rcmd = cmds[C_SUBSTITUTE];
			ecp->rcmd.fn = ex_subagain;
			ecp->cmd = &ecp->rcmd;
			break;
		}
		/* FALLTHROUGH */
	default:
473unknown:			if (newscreen)
			p[0] = toupper(p[0]);
		ex_unknown(sp, p, namelen);
		goto err;
	}

/*
 * The visual command has a different syntax when called
 * from ex than when called from a vi colon command.  FMH.
 * Make the change now, before we test for the newscreen
 * semantic, so that we're testing the right one.
 */
485skip_srch:	if (ecp->cmd == &cmds[C_VISUAL_EX] && F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002))))
	ecp->cmd = &cmds[C_VISUAL_VI];

/*
 * !!!
 * Historic vi permitted a capital 'P' at the beginning of
 * any command that started with 'p'.  Probably wanted the
 * P[rint] command for backward compatibility, and the code
 * just made Preserve and Put work by accident.  Nvi uses
 * Previous to mean previous-in-a-new-screen, so be careful.
 */
if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN)(((ecp->cmd)->flags) & ((0x00000100))) &&
    (ecp->cmd == &cmds[C_PRINT] ||
    ecp->cmd == &cmds[C_PRESERVE]))
	newscreen = 0;

/* Test for a newscreen associated with this command. */
if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN)(((ecp->cmd)->flags) & ((0x00000100))))
	goto unknown;

/* Secure means no shell access. */
if (F_ISSET(ecp->cmd, E_SECURE)(((ecp->cmd)->flags) & ((0x00000200))) && O_ISSET(sp, O_SECURE)((((&(((sp)))->opts[(((O_SECURE)))])->flags) & (
(0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_SECURE
)))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_SECURE)))]
.o_cur.val)) {
	ex_emsg(sp, ecp->cmd->name, EXM_SECURE);
	goto err;
}

/*
 * Multiple < and > characters; another "feature".  Note,
 * The string passed to the underlying function may not be
 * nul terminated in this case.
 */
if ((ecp->cmd == &cmds[C_SHIFTL] && *p == '<') ||
    (ecp->cmd == &cmds[C_SHIFTR] && *p == '>')) {
	for (ch = *p;
	    ecp->clen > 0; --ecp->clen, ++ecp->cp)
		if (*ecp->cp != ch)
			break;
	if (argv_exp0(sp, ecp, p, ecp->cp - p))
		goto err;
}

/* Set the format style flags for the next command. */
if (ecp->cmd == &cmds[C_HASH])
	exp->fdef = E_C_HASH0x00200;
else if (ecp->cmd == &cmds[C_LIST])
	exp->fdef = E_C_LIST0x00400;
else if (ecp->cmd == &cmds[C_PRINT])
	exp->fdef = E_C_PRINT0x01000;
F_CLR(ecp, E_USELASTCMD)(((ecp)->flags) &= ~((0x02000000)));
} else {
/* Print is the default command. */
ecp->cmd = &cmds[C_PRINT];

/* Set the saved format flags. */
F_SET(ecp, exp->fdef)(((ecp)->flags) |= ((exp->fdef)));

/*
 * !!!
 * If no address was specified, and it's not a global command,
 * we up the address by one.  (I have no idea why globals are
 * exempted, but it's (ahem) historic practice.)
 */
if (ecp->addrcnt == 0 && !F_ISSET(sp, SC_EX_GLOBAL)(((sp)->flags) & ((0x00020000)))) {
	ecp->addrcnt = 1;
	ecp->addr1.lno = sp->lno + 1;
	ecp->addr1.cno = sp->cno;
}

F_SET(ecp, E_USELASTCMD)(((ecp)->flags) |= ((0x02000000)));
}

/*
* !!!
* Historically, the number option applied to both ex and vi.  One
* strangeness was that ex didn't switch display formats until a
* command was entered, e.g. <CR>'s after the set didn't change to
* the new format, but :1p would.
*/
if (O_ISSET(sp, O_NUMBER)((((&(((sp)))->opts[(((O_NUMBER)))])->flags) & (
(0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_NUMBER
)))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_NUMBER)))]
.o_cur.val)) {
F_SET(ecp, E_OPTNUM)(((ecp)->flags) |= ((0x00010000)));
FL_SET(ecp->iflags, E_C_HASH)((ecp->iflags) |= (0x00200));
} else
F_CLR(ecp, E_OPTNUM)(((ecp)->flags) &= ~((0x00010000)));

/* Check for ex mode legality. */
if (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))) && (F_ISSET(ecp->cmd, E_VIONLY)(((ecp->cmd)->flags) & ((0x00000400))) || newscreen)) {
msgq(sp, M_ERR,
    "%s: command not available in ex mode", ecp->cmd->name);
goto err;
}

/* Add standard command flags. */
F_SET(ecp, ecp->cmd->flags)(((ecp)->flags) |= ((ecp->cmd->flags)));
if (!newscreen)
F_CLR(ecp, E_NEWSCREEN)(((ecp)->flags) &= ~((0x00000100)));

/*
* There are three normal termination cases for an ex command.  They
* are the end of the string (ecp->clen), or unescaped (by <literal
* next> characters) <newline> or '|' characters.  As we're now past
* possible addresses, we can determine how long the command is, so we
* don't have to look for all the possible terminations.  Naturally,
* there are some exciting special cases:
*
* 1: The bang, global, v and the filter versions of the read and
*    write commands are delimited by <newline>s (they can contain
*    shell pipes).
* 2: The ex, edit, next and visual in vi mode commands all take ex
*    commands as their first arguments.
* 3: The s command takes an RE as its first argument, and wants it
*    to be specially delimited.
*
* Historically, '|' characters in the first argument of the ex, edit,
* next, vi visual, and s commands didn't delimit the command.  And,
* in the filter cases for read and write, and the bang, global and v
* commands, they did not delimit the command at all.
*
* For example, the following commands were legal:
*
*	:edit +25|s/abc/ABC/ file.c
*	:s/|/PIPE/
*	:read !spell % | columnate
*	:global/pattern/p|l
*
* It's not quite as simple as it sounds, however.  The command:
*
*	:s/a/b/|s/c/d|set
*
* was also legal, i.e. the historic ex parser (using the word loosely,
* since "parser" implies some regularity of syntax) delimited the RE's
* based on its delimiter and not anything so irretrievably vulgar as a
* command syntax.
*
* Anyhow, the following code makes this all work.  First, for the
* special cases we move past their special argument(s).  Then, we
* do normal command processing on whatever is left.  Barf-O-Rama.
*/
discard = 0;		/* Characters discarded from the command. */
arg1_len = 0;
ecp->save_cmd = ecp->cp;
if (ecp->cmd == &cmds[C_EDIT] || ecp->cmd == &cmds[C_EX] ||
   ecp->cmd == &cmds[C_NEXT] || ecp->cmd == &cmds[C_VISUAL_VI]) {
/*
 * Move to the next non-whitespace character.  A '!'
 * immediately following the command is eaten as a
 * force flag.
 */
if (ecp->clen > 0 && *ecp->cp == '!') {
	++ecp->cp;
	--ecp->clen;
	FL_SET(ecp->iflags, E_C_FORCE)((ecp->iflags) |= (0x00100));

	/* Reset, don't reparse. */
	ecp->save_cmd = ecp->cp;
}
for (; ecp->clen > 0; --ecp->clen, ++ecp->cp)
	if (!isblank(*ecp->cp))
		break;
/*
 * QUOTING NOTE:
 *
 * The historic implementation ignored all escape characters
 * so there was no way to put a space or newline into the +cmd
 * field.  We do a simplistic job of fixing it by moving to the
 * first whitespace character that isn't escaped.  The escaping
 * characters are stripped as no longer useful.
 */
if (ecp->clen > 0 && *ecp->cp == '+') {
	++ecp->cp;
	--ecp->clen;
	for (arg1 = p = ecp->cp;
	    ecp->clen > 0; --ecp->clen, ++ecp->cp) {
		ch = *ecp->cp;
		if (IS_ESCAPE(sp, ecp, ch)(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
) &&
		    ecp->clen > 1) {
			++discard;
			--ecp->clen;
			ch = *++ecp->cp;
		} else if (isblank(ch))
			break;
		*p++ = ch;
	}
	arg1_len = ecp->cp - arg1;

	/* Reset, so the first argument isn't reparsed. */
	ecp->save_cmd = ecp->cp;
}
} else if (ecp->cmd == &cmds[C_BANG] ||
   ecp->cmd == &cmds[C_GLOBAL] || ecp->cmd == &cmds[C_V]) {
/*
 * QUOTING NOTE:
 *
 * We use backslashes to escape <newline> characters, although
 * this wasn't historic practice for the bang command.  It was
 * for the global and v commands, and it's common usage when
 * doing text insert during the command.  Escaping characters
 * are stripped as no longer useful.
 */
for (p = ecp->cp; ecp->clen > 0; --ecp->clen, ++ecp->cp) {
	ch = *ecp->cp;
	if (ch == '\\' && ecp->clen > 1 && ecp->cp[1] == '\n') {
		++discard;
		--ecp->clen;
		ch = *++ecp->cp;

		++gp->if_lno;
		++ecp->if_lno;
	} else if (ch == '\n')
		break;
	*p++ = ch;
}
} else if (ecp->cmd == &cmds[C_READ] || ecp->cmd == &cmds[C_WRITE]) {
/*
 * For write commands, if the next character is a <blank>, and
 * the next non-blank character is a '!', it's a filter command
 * and we want to eat everything up to the <newline>.  For read
 * commands, if the next non-blank character is a '!', it's a
 * filter command and we want to eat everything up to the next
 * <newline>.  Otherwise, we're done.
 */
for (tmp = 0; ecp->clen > 0; --ecp->clen, ++ecp->cp) {
	ch = *ecp->cp;
	if (isblank(ch))
		tmp = 1;
	else
		break;
}
if (ecp->clen > 0 && ch == '!' &&
    (ecp->cmd == &cmds[C_READ] || tmp))
	for (; ecp->clen > 0; --ecp->clen, ++ecp->cp)
		if (ecp->cp[0] == '\n')
			break;
} else if (ecp->cmd == &cmds[C_SUBSTITUTE]) {
/*
 * Move to the next non-whitespace character, we'll use it as
 * the delimiter.  If the character isn't an alphanumeric or
 * a '|', it's the delimiter, so parse it.  Otherwise, we're
 * into something like ":s g", so use the special s command.
 */
for (; ecp->clen > 0; --ecp->clen, ++ecp->cp)
	if (!isblank(ecp->cp[0]))
		break;

if (isalnum(ecp->cp[0]) || ecp->cp[0] == '|') {
	ecp->rcmd = cmds[C_SUBSTITUTE];
	ecp->rcmd.fn = ex_subagain;
	ecp->cmd = &ecp->rcmd;
} else if (ecp->clen > 0) {
	/*
	 * QUOTING NOTE:
	 *
	 * Backslashes quote delimiter characters for RE's.
	 * The backslashes are NOT removed since they'll be
	 * used by the RE code.  Move to the third delimiter
	 * that's not escaped (or the end of the command).
	 */
	delim = *ecp->cp;
	++ecp->cp;
	--ecp->clen;
	for (cnt = 2; ecp->clen > 0 &&
	    cnt != 0; --ecp->clen, ++ecp->cp)
		if (ecp->cp[0] == '\\' &&
		    ecp->clen > 1) {
			++ecp->cp;
			--ecp->clen;
		} else if (ecp->cp[0] == delim)
			--cnt;
}
}

/*
* Use normal quoting and termination rules to find the end of this
* command.
*
* QUOTING NOTE:
*
* Historically, vi permitted ^V's to escape <newline>'s in the .exrc
* file.  It was almost certainly a bug, but that's what bug-for-bug
* compatibility means, Grasshopper.  Also, ^V's escape the command
* delimiters.  Literal next quote characters in front of the newlines,
* '|' characters or literal next characters are stripped as they're
* no longer useful.
*/
vi_address = ecp->clen != 0 && ecp->cp[0] != '\n';
for (p = ecp->cp; ecp->clen > 0; --ecp->clen, ++ecp->cp) {
ch = ecp->cp[0];
if (IS_ESCAPE(sp, ecp, ch)(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
) && ecp->clen > 1) {
	tmp = ecp->cp[1];
	if (tmp == '\n' || tmp == '|') {
		if (tmp == '\n') {
			++gp->if_lno;
			++ecp->if_lno;
		}
		++discard;
		--ecp->clen;
		++ecp->cp;
		ch = tmp;
	}
} else if (ch == '\n' || ch == '|') {
	if (ch == '\n')
		F_SET(ecp, E_NEWLINE)(((ecp)->flags) |= ((0x00800000)));
	--ecp->clen;
	break;
}
*p++ = ch;
}

/*
* Save off the next command information, go back to the
* original start of the command.
*/
p = ecp->cp + 1;
ecp->cp = ecp->save_cmd;
ecp->save_cmd = p;
ecp->save_cmdlen = ecp->clen;
ecp->clen = ((ecp->save_cmd - ecp->cp) - 1) - discard;

/*
* QUOTING NOTE:
*
* The "set tags" command historically used a backslash, not the
* user's literal next character, to escape whitespace.  Handle
* it here instead of complicating the argv_exp3() code.  Note,
* this isn't a particularly complex trap, and if backslashes were
* legal in set commands, this would have to be much more complicated.
*/
if (ecp->cmd == &cmds[C_SET])
for (p = ecp->cp, len = ecp->clen; len > 0; --len, ++p)
	if (*p == '\\')
		*p = CH_LITERAL'\026';

/*
* Set the default addresses.  It's an error to specify an address for
* a command that doesn't take them.  If two addresses are specified
* for a command that only takes one, lose the first one.  Two special
* cases here, some commands take 0 or 2 addresses.  For most of them
* (the E_ADDR2_ALL flag), 0 defaults to the entire file.  For one
* (the `!' command, the E_ADDR2_NONE flag), 0 defaults to no lines.
*
* Also, if the file is empty, some commands want to use an address of
* 0, i.e. the entire file is 0 to 0, and the default first address is
* 0.  Otherwise, an entire file is 1 to N and the default line is 1.
* Note, we also add the E_ADDR_ZERO flag to the command flags, for the
* case where the 0 address is only valid if it's a default address.
*
* Also, set a flag if we set the default addresses.  Some commands
* (ex: z) care if the user specified an address or if we just used
* the current cursor.
*/
switch (F_ISSET(ecp, E_ADDR1 | E_ADDR2 | E_ADDR2_ALL | E_ADDR2_NONE)(((ecp)->flags) & ((0x00000001 | 0x00000002 | 0x00000004
 | 0x00000008)))) {
case E_ADDR10x00000001:				/* One address: */
switch (ecp->addrcnt) {
case 0:				/* Default cursor/empty file. */
	ecp->addrcnt = 1;
	F_SET(ecp, E_ADDR_DEF)(((ecp)->flags) |= ((0x00080000)));
	if (F_ISSET(ecp, E_ADDR_ZERODEF)(((ecp)->flags) & ((0x00000020)))) {
		if (db_last(sp, &lno))
			goto err;
		if (lno == 0) {
			ecp->addr1.lno = 0;
			F_SET(ecp, E_ADDR_ZERO)(((ecp)->flags) |= ((0x00000010)));
		} else
			ecp->addr1.lno = sp->lno;
	} else
		ecp->addr1.lno = sp->lno;
	ecp->addr1.cno = sp->cno;
	break;
case 1:
	break;
case 2:				/* Lose the first address. */
	ecp->addrcnt = 1;
	ecp->addr1 = ecp->addr2;
}
break;
case E_ADDR2_NONE0x00000008:			/* Zero/two addresses: */
if (ecp->addrcnt == 0)		/* Default to nothing. */
	break;
goto two_addr;
case E_ADDR2_ALL0x00000004:			/* Zero/two addresses: */
if (ecp->addrcnt == 0) {	/* Default entire/empty file. */
	F_SET(ecp, E_ADDR_DEF)(((ecp)->flags) |= ((0x00080000)));
	ecp->addrcnt = 2;
	if (sp->ep == NULL((void *)0))
		ecp->addr2.lno = 0;
	else if (db_last(sp, &ecp->addr2.lno))
		goto err;
	if (F_ISSET(ecp, E_ADDR_ZERODEF)(((ecp)->flags) & ((0x00000020))) &&
	    ecp->addr2.lno == 0) {
		ecp->addr1.lno = 0;
		F_SET(ecp, E_ADDR_ZERO)(((ecp)->flags) |= ((0x00000010)));
	} else
		ecp->addr1.lno = 1;
	ecp->addr1.cno = ecp->addr2.cno = 0;
	F_SET(ecp, E_ADDR2_ALL)(((ecp)->flags) |= ((0x00000004)));
	break;
}
/* FALLTHROUGH */
case E_ADDR20x00000002:				/* Two addresses: */
883two_addr:	switch (ecp->addrcnt) {
case 0:				/* Default cursor/empty file. */
	ecp->addrcnt = 2;
	F_SET(ecp, E_ADDR_DEF)(((ecp)->flags) |= ((0x00080000)));
	if (sp->lno == 1 &&
	    F_ISSET(ecp, E_ADDR_ZERODEF)(((ecp)->flags) & ((0x00000020)))) {
		if (db_last(sp, &lno))
			goto err;
		if (lno == 0) {
			ecp->addr1.lno = ecp->addr2.lno = 0;
			F_SET(ecp, E_ADDR_ZERO)(((ecp)->flags) |= ((0x00000010)));
		} else
			ecp->addr1.lno =
			    ecp->addr2.lno = sp->lno;
	} else
		ecp->addr1.lno = ecp->addr2.lno = sp->lno;
	ecp->addr1.cno = ecp->addr2.cno = sp->cno;
	break;
case 1:				/* Default to first address. */
	ecp->addrcnt = 2;
	ecp->addr2 = ecp->addr1;
	break;
case 2:
	break;
}
break;
default:
if (ecp->addrcnt)		/* Error. */
	goto usage;
}

/*
* !!!
* The ^D scroll command historically scrolled the value of the scroll
* option or to EOF.  It was an error if the cursor was already at EOF.
* (Leading addresses were permitted, but were then ignored.)
*/
if (ecp->cmd == &cmds[C_SCROLL]) {
ecp->addrcnt = 2;
ecp->addr1.lno = sp->lno + 1;
ecp->addr2.lno = sp->lno + O_VAL(sp, O_SCROLL)((((&((sp))->opts[((O_SCROLL))])->flags) & ((0x01
))) ? ((sp))->gp->opts[((sp))->opts[((O_SCROLL))].o_cur
.val].o_cur.val : ((sp))->opts[((O_SCROLL))].o_cur.val);
ecp->addr1.cno = ecp->addr2.cno = sp->cno;
if (db_last(sp, &lno))
	goto err;
if (lno != 0 && lno > sp->lno && ecp->addr2.lno > lno)
	ecp->addr2.lno = lno;
}

ecp->flagoff = 0;
for (p = ecp->cmd->syntax; *p != '\0'; ++p) {
/*
 * The force flag is sensitive to leading whitespace, i.e.
 * "next !" is different from "next!".  Handle it before
 * skipping leading <blank>s.
 */
if (*p == '!') {
	if (ecp->clen > 0 && *ecp->cp == '!') {
		++ecp->cp;
		--ecp->clen;
		FL_SET(ecp->iflags, E_C_FORCE)((ecp->iflags) |= (0x00100));
	}
	continue;
}

/* Skip leading <blank>s. */
for (; ecp->clen > 0; --ecp->clen, ++ecp->cp)
	if (!isblank(*ecp->cp))
		break;
if (ecp->clen == 0)
	break;

switch (*p) {
case '1':				/* +, -, #, l, p */
	/*
	 * !!!
	 * Historically, some flags were ignored depending
	 * on where they occurred in the command line.  For
	 * example, in the command, ":3+++p--#", historic vi
	 * acted on the '#' flag, but ignored the '-' flags.
	 * It's unambiguous what the flags mean, so we just
	 * handle them regardless of the stupidity of their
	 * location.
	 */
	for (; ecp->clen; --ecp->clen, ++ecp->cp)
		switch (*ecp->cp) {
		case '+':
			++ecp->flagoff;
			break;
		case '-':
		case '^':
			--ecp->flagoff;
			break;
		case '#':
			F_CLR(ecp, E_OPTNUM)(((ecp)->flags) &= ~((0x00010000)));
			FL_SET(ecp->iflags, E_C_HASH)((ecp->iflags) |= (0x00200));
			exp->fdef |= E_C_HASH0x00200;
			break;
		case 'l':
			FL_SET(ecp->iflags, E_C_LIST)((ecp->iflags) |= (0x00400));
			exp->fdef |= E_C_LIST0x00400;
			break;
		case 'p':
			FL_SET(ecp->iflags, E_C_PRINT)((ecp->iflags) |= (0x01000));
			exp->fdef |= E_C_PRINT0x01000;
			break;
		default:
			goto end_case1;
		}
991end_case1:		break;
case '2':				/* -, ., +, ^ */
case '3':				/* -, ., +, ^, = */
	for (; ecp->clen; --ecp->clen, ++ecp->cp)
		switch (*ecp->cp) {
		case '-':
			FL_SET(ecp->iflags, E_C_DASH)((ecp->iflags) |= (0x00020));
			break;
		case '.':
			FL_SET(ecp->iflags, E_C_DOT)((ecp->iflags) |= (0x00040));
			break;
		case '+':
			FL_SET(ecp->iflags, E_C_PLUS)((ecp->iflags) |= (0x00800));
			break;
		case '^':
			FL_SET(ecp->iflags, E_C_CARAT)((ecp->iflags) |= (0x00002));
			break;
		case '=':
			if (*p == '3') {
				FL_SET(ecp->iflags, E_C_EQUAL)((ecp->iflags) |= (0x00080));
				break;
			}
			/* FALLTHROUGH */
		default:
			goto end_case23;
		}
1017end_case23:		break;
case 'b':				/* buffer */
	/*
	 * !!!
	 * Historically, "d #" was a delete with a flag, not a
	 * delete into the '#' buffer.  If the current command
	 * permits a flag, don't use one as a buffer.  However,
	 * the 'l' and 'p' flags were legal buffer names in the
	 * historic ex, and were used as buffers, not flags.
	 */
	if ((ecp->cp[0] == '+' || ecp->cp[0] == '-' ||
	    ecp->cp[0] == '^' || ecp->cp[0] == '#') &&
	    strchr(p, '1') != NULL((void *)0))
		break;
	/*
	 * !!!
	 * Digits can't be buffer names in ex commands, or the
	 * command "d2" would be a delete into buffer '2', and
	 * not a two-line deletion.
	 */
	if (!isdigit(ecp->cp[0])) {
		ecp->buffer = *ecp->cp;
		++ecp->cp;
		--ecp->clen;
		FL_SET(ecp->iflags, E_C_BUFFER)((ecp->iflags) |= (0x00001));
	}
	break;
case 'c':				/* count [01+a] */
	++p;
	/* Validate any signed value. */
	if (!isdigit(*ecp->cp) && (*p != '+' ||
	    (*ecp->cp != '+' && *ecp->cp != '-')))
		break;
	/* If a signed value, set appropriate flags. */
	if (*ecp->cp == '-')
		FL_SET(ecp->iflags, E_C_COUNT_NEG)((ecp->iflags) |= (0x00008));
	else if (*ecp->cp == '+')
		FL_SET(ecp->iflags, E_C_COUNT_POS)((ecp->iflags) |= (0x00010));
	if ((nret =
	    nget_slong(&ltmp, ecp->cp, &t, 10)) != NUM_OK) {
		ex_badaddr(sp, NULL((void *)0), A_NOTSET, nret);
		goto err;
	}
	if (ltmp == 0 && *p != '0') {
		msgq(sp, M_ERR, "Count may not be zero");
		goto err;
	}
	ecp->clen -= (t - ecp->cp);
	ecp->cp = t;

	/*
	 * Counts as address offsets occur in commands taking
	 * two addresses.  Historic vi practice was to use
	 * the count as an offset from the *second* address.
	 *
	 * Set a count flag; some underlying commands (see
	 * join) do different things with counts than with
	 * line addresses.
	 */
	if (*p == 'a') {
		ecp->addr1 = ecp->addr2;
		ecp->addr2.lno = ecp->addr1.lno + ltmp - 1;
	} else
		ecp->count = ltmp;
	FL_SET(ecp->iflags, E_C_COUNT)((ecp->iflags) |= (0x00004));
	break;
case 'f':				/* file */
	if (argv_exp2(sp, ecp, ecp->cp, ecp->clen))
		goto err;
	goto arg_cnt_chk;
case 'l':				/* line */
	/*
	 * Get a line specification.
	 *
	 * If the line was a search expression, we may have
	 * changed state during the call, and we're now
	 * searching the file.  Push ourselves onto the state
	 * stack.
	 */
	if (ex_line(sp, ecp, &cur, &isaddr, &tmp))
		goto rfail;
	if (tmp)
		goto err;

	/* Line specifications are always required. */
	if (!isaddr) {
		msgq_str(sp, M_ERR, ecp->cp,
		     "%s: bad line specification");
		goto err;
	}
	/*
	 * The target line should exist for these commands,
	 * but 0 is legal for them as well.
	 */
	if (cur.lno != 0 && !db_exist(sp, cur.lno)) {
		ex_badaddr(sp, NULL((void *)0), A_EOF, NUM_OK);
		goto err;
	}
	ecp->lineno = cur.lno;
	break;
case 'S':				/* string, file exp. */
	if (ecp->clen != 0) {
		if (argv_exp1(sp, ecp, ecp->cp,
		    ecp->clen, ecp->cmd == &cmds[C_BANG]))
			goto err;
		goto addr_verify;
	}
	/* FALLTHROUGH */
case 's':				/* string */
	if (argv_exp0(sp, ecp, ecp->cp, ecp->clen))
		goto err;
	goto addr_verify;
case 'W':				/* word string */
	/*
	 * QUOTING NOTE:
	 *
	 * Literal next characters escape the following
	 * character.  Quoting characters are stripped here
	 * since they are no longer useful.
	 *
	 * First there was the word.
	 */
	for (p = t = ecp->cp;
	    ecp->clen > 0; --ecp->clen, ++ecp->cp) {
		ch = *ecp->cp;
		if (IS_ESCAPE(sp,(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
)
		    ecp, ch)(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
) && ecp->clen > 1) {
			--ecp->clen;
			*p++ = *++ecp->cp;
		} else if (isblank(ch)) {
			++ecp->cp;
			--ecp->clen;
			break;
		} else
			*p++ = ch;
	}
	if (argv_exp0(sp, ecp, t, p - t))
		goto err;

	/* Delete intervening whitespace. */
	for (; ecp->clen > 0;
	    --ecp->clen, ++ecp->cp) {
		ch = *ecp->cp;
		if (!isblank(ch))
			break;
	}
	if (ecp->clen == 0)
		goto usage;

	/* Followed by the string. */
	for (p = t = ecp->cp; ecp->clen > 0;
	    --ecp->clen, ++ecp->cp, ++p) {
		ch = *ecp->cp;
		if (IS_ESCAPE(sp,(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
)
		    ecp, ch)(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
) && ecp->clen > 1) {
			--ecp->clen;
			*p = *++ecp->cp;
		} else
			*p = ch;
	}
	if (argv_exp0(sp, ecp, t, p - t))
		goto err;
	goto addr_verify;
case 'w':				/* word */
	if (argv_exp3(sp, ecp, ecp->cp, ecp->clen))
		goto err;
1183arg_cnt_chk:		if (*++p != 'N') {		/* N */
		/*
		 * If a number is specified, must either be
		 * 0 or that number, if optional, and that
		 * number, if required.
		 */
		tmp = *p - '0';
		if ((*++p != 'o' || exp->argsoff != 0) &&
		    exp->argsoff != tmp)
			goto usage;
	}
	goto addr_verify;
default:
	msgq(sp, M_ERR,
	    "Internal syntax table error (%s: %s)",
	    ecp->cmd->name, KEY_NAME(sp, *p)((unsigned char)(*p) <= 254 ? (sp)->gp->cname[(unsigned
 char)(*p)].name : v_key_name((sp), (*p))));
}
}

/* Skip trailing whitespace. */
for (; ecp->clen > 0; --ecp->clen) {
ch = *ecp->cp++;
if (!isblank(ch))
	break;
}

/*
* There shouldn't be anything left, and no more required fields,
* i.e neither 'l' or 'r' in the syntax string.
*/
if (ecp->clen != 0 || strpbrk(p, "lr")) {
1214usage:		msgq(sp, M_ERR, "Usage: %s", ecp->cmd->usage);
goto err;
}

/*
* Verify that the addresses are legal.  Check the addresses here,
* because this is a place where all ex addresses pass through.
* (They don't all pass through ex_line(), for instance.)  We're
* assuming that any non-existent line doesn't exist because it's
* past the end-of-file.  That's a pretty good guess.
*
* If it's a "default vi command", an address of zero is okay.
*/
1227addr_verify:
switch (ecp->addrcnt) {
case 2:
/*
 * Historic ex/vi permitted commands with counts to go past
 * EOF.  So, for example, if the file only had 5 lines, the
 * ex command "1,6>" would fail, but the command ">300"
 * would succeed.  Since we don't want to have to make all
 * of the underlying commands handle random line numbers,
 * fix it here.
 */
if (ecp->addr2.lno == 0) {
	if (!F_ISSET(ecp, E_ADDR_ZERO)(((ecp)->flags) & ((0x00000010))) &&
	    (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))) ||
	    !F_ISSET(ecp, E_USELASTCMD)(((ecp)->flags) & ((0x02000000))))) {
		ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK);
		goto err;
	}
} else if (!db_exist(sp, ecp->addr2.lno)) {
	if (FL_ISSET(ecp->iflags, E_C_COUNT)((ecp->iflags) & (0x00004))) {
		if (db_last(sp, &lno))
			goto err;
		ecp->addr2.lno = lno;
	} else {
		ex_badaddr(sp, NULL((void *)0), A_EOF, NUM_OK);
		goto err;
	}
}
/* FALLTHROUGH */
case 1:
if (ecp->addr1.lno == 0) {
	if (!F_ISSET(ecp, E_ADDR_ZERO)(((ecp)->flags) & ((0x00000010))) &&
	    (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))) ||
	    !F_ISSET(ecp, E_USELASTCMD)(((ecp)->flags) & ((0x02000000))))) {
		ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK);
		goto err;
	}
} else if (!db_exist(sp, ecp->addr1.lno)) {
	ex_badaddr(sp, NULL((void *)0), A_EOF, NUM_OK);
	goto err;
}
break;
}

/*
* If doing a default command and there's nothing left on the line,
* vi just moves to the line.  For example, ":3" and ":'a,'b" just
* move to line 3 and line 'b, respectively, but ":3|" prints line 3.
*
* !!!
* In addition, IF THE LINE CHANGES, move to the first nonblank of
* the line.
*
* !!!
* This is done before the absolute mark gets set; historically,
* "/a/,/b/" did NOT set vi's absolute mark, but "/a/,/b/d" did.
*/
if ((F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002))) || F_ISSET(ecp, E_NOPRDEF)(((ecp)->flags) & ((0x00004000)))) &&
   F_ISSET(ecp, E_USELASTCMD)(((ecp)->flags) & ((0x02000000))) && vi_address == 0) {
switch (ecp->addrcnt) {
case 2:
	if (sp->lno !=
	    (ecp->addr2.lno ? ecp->addr2.lno : 1)) {
		sp->lno =
		    ecp->addr2.lno ? ecp->addr2.lno : 1;
		sp->cno = 0;
		(void)nonblank(sp, sp->lno, &sp->cno);
	}
	break;
case 1:
	if (sp->lno !=
	    (ecp->addr1.lno ? ecp->addr1.lno : 1)) {
		sp->lno =
		    ecp->addr1.lno ? ecp->addr1.lno : 1;
		sp->cno = 0;
		(void)nonblank(sp, sp->lno, &sp->cno);
	}
	break;
}
ecp->cp = ecp->save_cmd;
ecp->clen = ecp->save_cmdlen;
goto loop;
}

/*
* Set the absolute mark -- we have to set it for vi here, in case
* it's a compound command, e.g. ":5p|6" should set the absolute
* mark for vi.
*/
if (F_ISSET(ecp, E_ABSMARK)(((ecp)->flags) & ((0x00040000)))) {
cur.lno = sp->lno;
cur.cno = sp->cno;
F_CLR(ecp, E_ABSMARK)(((ecp)->flags) &= ~((0x00040000)));
if (mark_set(sp, ABSMARK1'\'', &cur, 1))
	goto err;
}

1324#if defined(DEBUG) && defined(COMLOG)
ex_comlog(sp, ecp);
1326#endif
/* Increment the command count if not called from vi. */
if (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))))
++sp->ccnt;

/*
* If file state available, and not doing a global command,
* log the start of an action.
*/
if (sp->ep != NULL((void *)0) && !F_ISSET(sp, SC_EX_GLOBAL)(((sp)->flags) & ((0x00020000))))
(void)log_cursor(sp);

/*
* !!!
* There are two special commands for the purposes of this code: the
* default command (<carriage-return>) or the scrolling commands (^D
* and <EOF>) as the first non-<blank> characters  in the line.
*
* If this is the first command in the command line, we received the
* command from the ex command loop and we're talking to a tty, and
* and there's nothing else on the command line, and it's one of the
* special commands, we move back up to the previous line, and erase
* the prompt character with the output.  Since ex runs in canonical
* mode, we don't have to do anything else, a <newline> has already
* been echoed by the tty driver.  It's OK if vi calls us -- we won't
* be in ex mode so we'll do nothing.
*/
if (F_ISSET(ecp, E_NRSEP)(((ecp)->flags) & ((0x00008000)))) {
if (sp->ep != NULL((void *)0) &&
    F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))) && !F_ISSET(gp, G_SCRIPTED)(((gp)->flags) & ((0x0010))) &&
    (F_ISSET(ecp, E_USELASTCMD)(((ecp)->flags) & ((0x02000000))) || ecp->cmd == &cmds[C_SCROLL]))
	gp->scr_ex_adjust(sp, EX_TERM_SCROLL);
F_CLR(ecp, E_NRSEP)(((ecp)->flags) &= ~((0x00008000)));
}

/*
* Call the underlying function for the ex command.
*
* XXX
* Interrupts behave like errors, for now.
*/
if (ecp->cmd->fn(sp, ecp) || INTERRUPTED(sp)(((((sp)->gp)->flags) & ((0x0004))) || (!v_event_get
((sp), ((void *)0), 0, 0x001) && ((((sp)->gp)->
flags) & ((0x0004)))))) {
if (F_ISSET(gp, G_SCRIPTED)(((gp)->flags) & ((0x0010))))
	F_SET(sp, SC_EXIT_FORCE)(((sp)->flags) |= ((0x00000400)));
goto err;
}

1373#ifdef DEBUG
/* Make sure no function left global temporary space locked. */
if (F_ISSET(gp, G_TMP_INUSE)(((gp)->flags) & ((0x0100)))) {
F_CLR(gp, G_TMP_INUSE)(((gp)->flags) &= ~((0x0100)));
msgq(sp, M_ERR, "%s: temporary buffer not released",
    ecp->cmd->name);
}
1380#endif
/*
* Ex displayed the number of lines modified immediately after each
* command, so the command "1,10d|1,10d" would display:
*
*	10 lines deleted
*	10 lines deleted
*	<autoprint line>
*
* Executing ex commands from vi only reported the final modified
* lines message -- that's wrong enough that we don't match it.
*/
if (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))))
mod_rpt(sp);

/*
* Integrate any offset parsed by the underlying command, and make
* sure the referenced line exists.
*
* XXX
* May not match historic practice (which I've never been able to
* completely figure out.)  For example, the '=' command from vi
* mode often got the offset wrong, and complained it was too large,
* but didn't seem to have a problem with the cursor.  If anyone
* complains, ask them how it's supposed to work, they might know.
*/
if (sp->ep != NULL((void *)0) && ecp->flagoff) {
if (ecp->flagoff < 0) {
	if (sp->lno <= -ecp->flagoff) {
		msgq(sp, M_ERR,
		    "Flag offset to before line 1");
		goto err;
	}
} else {
	if (!NPFITS(MAX_REC_NUMBER, sp->lno, ecp->flagoff)(((unsigned long)(0xffffffff)) - (sp->lno) >= (ecp->
flagoff))) {
		ex_badaddr(sp, NULL((void *)0), A_NOTSET, NUM_OVER);
		goto err;
	}
	if (!db_exist(sp, sp->lno + ecp->flagoff)) {
		msgq(sp, M_ERR,
		    "Flag offset past end-of-file");
		goto err;
	}
}
sp->lno += ecp->flagoff;
}

/*
* If the command executed successfully, we may want to display a line
* based on the autoprint option or an explicit print flag.  (Make sure
* that there's a line to display.)  Also, the autoprint edit option is
* turned off for the duration of global commands.
*/
if (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001))) && sp->ep != NULL((void *)0) && sp->lno != 0) {
/*
 * The print commands have already handled the `print' flags.
 * If so, clear them.
 */
if (FL_ISSET(ecp->iflags, E_CLRFLAG)((ecp->iflags) & (0x00000080)))
	FL_CLR(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT)((ecp->iflags) &= ~(0x00200 | 0x00400 | 0x01000));

/* If hash set only because of the number option, discard it. */
if (F_ISSET(ecp, E_OPTNUM)(((ecp)->flags) & ((0x00010000))))
	FL_CLR(ecp->iflags, E_C_HASH)((ecp->iflags) &= ~(0x00200));

/*
 * If there was an explicit flag to display the new cursor line,
 * or autoprint is set and a change was made, display the line.
 * If any print flags were set use them, else default to print.
 */
LF_INIT(FL_ISSET(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT))(flags) = ((((ecp->iflags) & (0x00200 | 0x00400 | 0x01000
))));
if (!LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT | E_NOAUTO)((flags) & ((0x00200 | 0x00400 | 0x01000 | 0x00002000))) &&
    !F_ISSET(sp, SC_EX_GLOBAL)(((sp)->flags) & ((0x00020000))) &&
    O_ISSET(sp, O_AUTOPRINT)((((&(((sp)))->opts[(((O_AUTOPRINT)))])->flags) &
 ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_AUTOPRINT
)))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_AUTOPRINT)
))].o_cur.val) && F_ISSET(ecp, E_AUTOPRINT)(((ecp)->flags) & ((0x00000040))))
	LF_INIT(E_C_PRINT)(flags) = ((0x01000));

if (LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT)((flags) & ((0x00200 | 0x00400 | 0x01000)))) {
	cur.lno = sp->lno;
	cur.cno = 0;
	(void)ex_print(sp, ecp, &cur, &cur, flags);
}
}

/*
* If the command had an associated "+cmd", it has to be executed
* before we finish executing any more of this ex command.  For
* example, consider a .exrc file that contains the following lines:
*
*	:set all
*	:edit +25 file.c|s/abc/ABC/|1
*	:3,5 print
*
* This can happen more than once -- the historic vi simply hung or
* dropped core, of course.  Prepend the + command back into the
* current command and continue.  We may have to add an additional
* <literal next> character.  We know that it will fit because we
* discarded at least one space and the + character.
*/
if (arg1_len != 0) {
/*
 * If the last character of the + command was a <literal next>
 * character, it would be treated differently because of the
 * append.  Quote it, if necessary.
 */
if (IS_ESCAPE(sp, ecp, arg1[arg1_len - 1])(((((ecp))->flags) & ((0x00020000))) ? (arg1[arg1_len -
 1]) == '\026' : ((unsigned char)((arg1[arg1_len - 1])) <=
? ((sp))->gp->special_key[(unsigned char)((arg1[arg1_len
 - 1]))] : (unsigned char)((arg1[arg1_len - 1])) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((arg1[arg1_len - 1
])))) == K_VLNEXT)) {
	*--ecp->save_cmd = CH_LITERAL'\026';
	++ecp->save_cmdlen;
}

ecp->save_cmd -= arg1_len;
ecp->save_cmdlen += arg1_len;
memmove(ecp->save_cmd, arg1, arg1_len);

/*
 * Any commands executed from a +cmd are executed starting at
 * the first column of the last line of the file -- NOT the
 * first nonblank.)  The main file startup code doesn't know
 * that a +cmd was set, however, so it may have put us at the
 * top of the file.  (Note, this is safe because we must have
 * switched files to get here.)
 */
F_SET(ecp, E_MOVETOEND)(((ecp)->flags) |= ((0x00400000)));
}

/* Update the current command. */
ecp->cp = ecp->save_cmd;
ecp->clen = ecp->save_cmdlen;

/*
* !!!
* If we've changed screens or underlying files, any pending global or
* v command, or @ buffer that has associated addresses, has to be
* discarded.  This is historic practice for globals, and necessary for
* @ buffers that had associated addresses.
*
* Otherwise, if we've changed underlying files, it's not a problem,
* we continue with the rest of the ex command(s), operating on the
* new file.  However, if we switch screens (either by exiting or by
* an explicit command), we have no way of knowing where to put output
* messages, and, since we don't control screens here, we could screw
* up the upper layers, (e.g. we could exit/reenter a screen multiple
* times).  So, return and continue after we've got a new screen.
*/
if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_FSWITCH | SC_SSWITCH)(((sp)->flags) & ((0x00000200 | 0x00000400 | 0x00000800
 | 0x00001000)))) {
at_found = gv_found = 0;
LIST_FOREACH(ecp, &sp->gp->ecq, q)for((ecp) = ((&sp->gp->ecq)->lh_first); (ecp)!= (
(void *)0); (ecp) = ((ecp)->q.le_next))
	switch (ecp->agv_flags) {
	case 0:
	case AGV_AT_NORANGE0x02:
		break;
	case AGV_AT0x01:
		if (!at_found) {
			at_found = 1;
			msgq(sp, M_ERR,
"@ with range running when the file/screen changed");
		}
		break;
	case AGV_GLOBAL0x04:
	case AGV_V0x08:
		if (!gv_found) {
			gv_found = 1;
			msgq(sp, M_ERR,
"Global/v command running when the file/screen changed");
		}
		break;
	default:
		abort();
	}
if (at_found || gv_found)
	goto discard;
if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_SSWITCH)(((sp)->flags) & ((0x00000200 | 0x00000400 | 0x00001000
))))
	goto rsuccess;
}

goto loop;
/* NOTREACHED */

1557err:	/*
* On command failure, we discard keys and pending commands remaining,
* as well as any keys that were mapped and waiting.  The save_cmdlen
* test is not necessarily correct.  If we fail early enough we don't
* know if the entire string was a single command or not.  Guess, as
* it's useful to know if commands other than the current one are being
* discarded.
*/
if (ecp->save_cmdlen == 0)
10
←
Assuming field 'save_cmdlen' is not equal to 0→
11
←
Taking false branch→
for (; ecp->clen; --ecp->clen) {
	ch = *ecp->cp++;
	if (IS_ESCAPE(sp, ecp, ch)(((((ecp))->flags) & ((0x00020000))) ? (ch) == '\026' :
 ((unsigned char)((ch)) <= 254 ? ((sp))->gp->special_key
[(unsigned char)((ch))] : (unsigned char)((ch)) > ((sp))->
gp->max_special ? 0 : v_key_val(((sp)),((ch)))) == K_VLNEXT
) && ecp->clen > 1) {
		--ecp->clen;
		++ecp->cp;
	} else if (ch == '\n' || ch == '|') {
		if (ecp->clen > 1)
			ecp->save_cmdlen = 1;
		break;
	}
}
if (ecp->save_cmdlen11.1
Field 'save_cmdlen' is not equal to 0
 != 0 || LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first) != &gp->excmd) {
1578discard:	msgq(sp, M_BERR,
    "Ex command failed: pending commands discarded");
ex_discard(sp);
12
←
Calling 'ex_discard'→
}
if (v_event_flush(sp, CH_MAPPED0x02))
msgq(sp, M_BERR,
    "Ex command failed: mapped keys discarded");

1586rfail:	tmp = 1;
if (0)
1588rsuccess:	tmp = 0;

/* Turn off any file name error information. */
gp->if_name = NULL((void *)0);

/* Turn off the global bit. */
F_CLR(sp, SC_EX_GLOBAL)(((sp)->flags) &= ~((0x00020000)));

return (tmp);
1597}

1599/*
* ex_range --
*	Get a line range for ex commands, or perform a vi ex address search.
*
* PUBLIC: int ex_range(SCR *, EXCMD *, int *);
*/
1605int
1606ex_range(SCR *sp, EXCMD *ecp, int *errp)
1607{
enum { ADDR_FOUND, ADDR_NEED, ADDR_NONE } addr;
MARK m;
int isaddr;

*errp = 0;

/*
* Parse comma or semi-colon delimited line specs.
*
* Semi-colon delimiters update the current address to be the last
* address.  For example, the command
*
*	:3;/pattern/ecp->cp
*
* will search for pattern from line 3.  In addition, if ecp->cp
* is not a valid command, the current line will be left at 3, not
* at the original address.
*
* Extra addresses are discarded, starting with the first.
*
* !!!
* If any addresses are missing, they default to the current line.
* This was historically true for both leading and trailing comma
* delimited addresses as well as for trailing semicolon delimited
* addresses.  For consistency, we make it true for leading semicolon
* addresses as well.
*/
for (addr = ADDR_NONE, ecp->addrcnt = 0; ecp->clen > 0;)
switch (*ecp->cp) {
case '%':		/* Entire file. */
	/* Vi ex address searches didn't permit % signs. */
	if (F_ISSET(ecp, E_VISEARCH)(((ecp)->flags) & ((0x04000000))))
		goto ret;

	/* It's an error if the file is empty. */
	if (sp->ep == NULL((void *)0)) {
		ex_badaddr(sp, NULL((void *)0), A_EMPTY, NUM_OK);
		*errp = 1;
		return (0);
	}
	/*
	 * !!!
	 * A percent character addresses all of the lines in
	 * the file.  Historically, it couldn't be followed by
	 * any other address.  We do it as a text substitution
	 * for simplicity.  POSIX 1003.2 is expected to follow
	 * this practice.
	 *
	 * If it's an empty file, the first line is 0, not 1.
	 */
	if (addr == ADDR_FOUND) {
		ex_badaddr(sp, NULL((void *)0), A_COMBO, NUM_OK);
		*errp = 1;
		return (0);
	}
	if (db_last(sp, &ecp->addr2.lno))
		return (1);
	ecp->addr1.lno = ecp->addr2.lno == 0 ? 0 : 1;
	ecp->addr1.cno = ecp->addr2.cno = 0;
	ecp->addrcnt = 2;
	addr = ADDR_FOUND;
	++ecp->cp;
	--ecp->clen;
	break;
case ',':               /* Comma delimiter. */
	/* Vi ex address searches didn't permit commas. */
	if (F_ISSET(ecp, E_VISEARCH)(((ecp)->flags) & ((0x04000000))))
		goto ret;
	/* FALLTHROUGH */
case ';':               /* Semi-colon delimiter. */
	if (sp->ep == NULL((void *)0)) {
		ex_badaddr(sp, NULL((void *)0), A_EMPTY, NUM_OK);
		*errp = 1;
		return (0);
	}
	if (addr != ADDR_FOUND)
		switch (ecp->addrcnt) {
		case 0:
			ecp->addr1.lno = sp->lno;
			ecp->addr1.cno = sp->cno;
			ecp->addrcnt = 1;
			break;
		case 2:
			ecp->addr1 = ecp->addr2;
			/* FALLTHROUGH */
		case 1:
			ecp->addr2.lno = sp->lno;
			ecp->addr2.cno = sp->cno;
			ecp->addrcnt = 2;
			break;
		}
	if (*ecp->cp == ';')
		switch (ecp->addrcnt) {
		case 0:
			abort();
			/* NOTREACHED */
		case 1:
			sp->lno = ecp->addr1.lno;
			sp->cno = ecp->addr1.cno;
			break;
		case 2:
			sp->lno = ecp->addr2.lno;
			sp->cno = ecp->addr2.cno;
			break;
		}
	addr = ADDR_NEED;
	/* FALLTHROUGH */
case ' ':		/* Whitespace. */
case '\t':		/* Whitespace. */
	++ecp->cp;
	--ecp->clen;
	break;
default:
	/* Get a line specification. */
	if (ex_line(sp, ecp, &m, &isaddr, errp))
		return (1);
	if (*errp)
		return (0);
	if (!isaddr)
		goto ret;
	if (addr == ADDR_FOUND) {
		ex_badaddr(sp, NULL((void *)0), A_COMBO, NUM_OK);
		*errp = 1;
		return (0);
	}
	switch (ecp->addrcnt) {
	case 0:
		ecp->addr1 = m;
		ecp->addrcnt = 1;
		break;
	case 1:
		ecp->addr2 = m;
		ecp->addrcnt = 2;
		break;
	case 2:
		ecp->addr1 = ecp->addr2;
		ecp->addr2 = m;
		break;
	}
	addr = ADDR_FOUND;
	break;
}

/*
* !!!
* Vi ex address searches are indifferent to order or trailing
* semi-colons.
*/
1756ret:	if (F_ISSET(ecp, E_VISEARCH)(((ecp)->flags) & ((0x04000000))))
return (0);

if (addr == ADDR_NEED)
switch (ecp->addrcnt) {
case 0:
	ecp->addr1.lno = sp->lno;
	ecp->addr1.cno = sp->cno;
	ecp->addrcnt = 1;
	break;
case 2:
	ecp->addr1 = ecp->addr2;
	/* FALLTHROUGH */
case 1:
	ecp->addr2.lno = sp->lno;
	ecp->addr2.cno = sp->cno;
	ecp->addrcnt = 2;
	break;
}

if (ecp->addrcnt == 2 && ecp->addr2.lno < ecp->addr1.lno) {
msgq(sp, M_ERR,
    "The second address is smaller than the first");
*errp = 1;
}
return (0);
1782}

1784/*
* ex_line --
*	Get a single line address specifier.
*
* The way the "previous context" mark worked was that any "non-relative"
* motion set it.  While ex/vi wasn't totally consistent about this, ANY
* numeric address, search pattern, '$', or mark reference in an address
* was considered non-relative, and set the value.  Which should explain
* why we're hacking marks down here.  The problem was that the mark was
* only set if the command was called, i.e. we have to set a flag and test
* it later.
*
* XXX
* This is probably still not exactly historic practice, although I think
* it's fairly close.
*/
1800static int
1801ex_line(SCR *sp, EXCMD *ecp, MARK *mp, int *isaddrp, int *errp)
1802{
enum nresult nret;
long total, val;
int isneg;
int (*sf)(SCR *, MARK *, MARK *, char *, size_t, char **, u_int);
char *endp;

*isaddrp = *errp = 0;
F_CLR(ecp, E_DELTA)(((ecp)->flags) &= ~((0x00100000)));

/* No addresses permitted until a file has been read in. */
if (sp->ep == NULL((void *)0) && strchr("$0123456789'\\/?.+-^", *ecp->cp)) {
ex_badaddr(sp, NULL((void *)0), A_EMPTY, NUM_OK);
*errp = 1;
return (0);
}

switch (*ecp->cp) {
case '$':				/* Last line in the file. */
*isaddrp = 1;
F_SET(ecp, E_ABSMARK)(((ecp)->flags) |= ((0x00040000)));

mp->cno = 0;
if (db_last(sp, &mp->lno))
	return (1);
++ecp->cp;
--ecp->clen;
break;				/* Absolute line number. */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
*isaddrp = 1;
F_SET(ecp, E_ABSMARK)(((ecp)->flags) |= ((0x00040000)));

if ((nret = nget_slong(&val, ecp->cp, &endp, 10)) != NUM_OK) {
	ex_badaddr(sp, NULL((void *)0), A_NOTSET, nret);
	*errp = 1;
	return (0);
}
if (!NPFITS(MAX_REC_NUMBER, 0, val)(((unsigned long)(0xffffffff)) - (0) >= (val))) {
	ex_badaddr(sp, NULL((void *)0), A_NOTSET, NUM_OVER);
	*errp = 1;
	return (0);
}
mp->lno = val;
mp->cno = 0;
ecp->clen -= (endp - ecp->cp);
ecp->cp = endp;
break;
case '\'':				/* Use a mark. */
*isaddrp = 1;
F_SET(ecp, E_ABSMARK)(((ecp)->flags) |= ((0x00040000)));

if (ecp->clen == 1) {
	msgq(sp, M_ERR, "No mark name supplied");
	*errp = 1;
	return (0);
}
if (mark_get(sp, ecp->cp[1], mp, M_ERR)) {
	*errp = 1;
	return (0);
}
ecp->cp += 2;
ecp->clen -= 2;
break;
case '\\':				/* Search: forward/backward. */
/*
 * !!!
 * I can't find any difference between // and \/ or between
 * ?? and \?.  Mark Horton doesn't remember there being any
 * difference.  C'est la vie.
 */
if (ecp->clen < 2 ||
    (ecp->cp[1] != '/' && ecp->cp[1] != '?')) {
	msgq(sp, M_ERR, "\\ not followed by / or ?");
	*errp = 1;
	return (0);
}
++ecp->cp;
--ecp->clen;
sf = ecp->cp[0] == '/' ? f_search : b_search;
goto search;
case '/':				/* Search forward. */
sf = f_search;
goto search;
case '?':				/* Search backward. */
sf = b_search;

1889search:		mp->lno = sp->lno;
mp->cno = sp->cno;
if (sf(sp, mp, mp, ecp->cp, ecp->clen, &endp,
    SEARCH_MSG0x0010 | SEARCH_PARSE0x0020 | SEARCH_SET0x0040 |
    (F_ISSET(ecp, E_SEARCH_WMSG)(((ecp)->flags) & ((0x01000000))) ? SEARCH_WMSG0x0100 : 0))) {
	*errp = 1;
	return (0);
}

/* Fix up the command pointers. */
ecp->clen -= (endp - ecp->cp);
ecp->cp = endp;

*isaddrp = 1;
F_SET(ecp, E_ABSMARK)(((ecp)->flags) |= ((0x00040000)));
break;
case '.':				/* Current position. */
*isaddrp = 1;
mp->cno = sp->cno;

/* If an empty file, then '.' is 0, not 1. */
if (sp->lno == 1) {
	if (db_last(sp, &mp->lno))
		return (1);
	if (mp->lno != 0)
		mp->lno = 1;
} else
	mp->lno = sp->lno;

/*
 * !!!
 * Historically, .<number> was the same as .+<number>, i.e.
 * the '+' could be omitted.  (This feature is found in ed
 * as well.)
 */
if (ecp->clen > 1 && isdigit(ecp->cp[1]))
	*ecp->cp = '+';
else {
	++ecp->cp;
	--ecp->clen;
}
break;
}

/* Skip trailing <blank>s. */
for (; ecp->clen > 0 &&
   isblank(ecp->cp[0]); ++ecp->cp, --ecp->clen);

/*
* Evaluate any offset.  If no address yet found, the offset
* is relative to ".".
*/
total = 0;
if (ecp->clen != 0 && (isdigit(ecp->cp[0]) ||
   ecp->cp[0] == '+' || ecp->cp[0] == '-' ||
   ecp->cp[0] == '^')) {
if (!*isaddrp) {
	*isaddrp = 1;
	mp->lno = sp->lno;
	mp->cno = sp->cno;
}
/*
 * Evaluate an offset, defined as:
 *
 *		[+-^<blank>]*[<blank>]*[0-9]*
 *
 * The rough translation is any number of signs, optionally
 * followed by numbers, or a number by itself, all <blank>
 * separated.
 *
 * !!!
 * All address offsets were additive, e.g. "2 2 3p" was the
 * same as "7p", or, "/ZZZ/ 2" was the same as "/ZZZ/+2".
 * Note, however, "2 /ZZZ/" was an error.  It was also legal
 * to insert signs without numbers, so "3 - 2" was legal, and
 * equal to 4.
 *
 * !!!
 * Offsets were historically permitted for any line address,
 * e.g. the command "1,2 copy 2 2 2 2" copied lines 1,2 after
 * line 8.
 *
 * !!!
 * Offsets were historically permitted for search commands,
 * and handled as addresses: "/pattern/2 2 2" was legal, and
 * referenced the 6th line after pattern.
 */
F_SET(ecp, E_DELTA)(((ecp)->flags) |= ((0x00100000)));
for (;;) {
	for (; ecp->clen > 0 && isblank(ecp->cp[0]);
	    ++ecp->cp, --ecp->clen);
	if (ecp->clen == 0 || (!isdigit(ecp->cp[0]) &&
	    ecp->cp[0] != '+' && ecp->cp[0] != '-' &&
	    ecp->cp[0] != '^'))
		break;
	if (!isdigit(ecp->cp[0]) &&
	    !isdigit(ecp->cp[1])) {
		total += ecp->cp[0] == '+' ? 1 : -1;
		--ecp->clen;
		++ecp->cp;
	} else {
		if (ecp->cp[0] == '-' ||
		    ecp->cp[0] == '^') {
			++ecp->cp;
			--ecp->clen;
			isneg = 1;
		} else
			isneg = 0;

		/* Get a signed long, add it to the total. */
		if ((nret = nget_slong(&val,
		    ecp->cp, &endp, 10)) != NUM_OK ||
		    (nret = NADD_SLONG(total, val)((total) < 0 ? ((val) < 0 && (((long)((-9223372036854775807L
 -1L))) - ((total)) <= ((val)))) ? NUM_UNDER : NUM_OK : (total
) > 0 ? (val) > 0 && (((unsigned long)(9223372036854775807L
)) - ((total)) >= ((val))) ? NUM_OK : NUM_OVER : NUM_OK)) != NUM_OK) {
			ex_badaddr(sp, NULL((void *)0), A_NOTSET, nret);
			*errp = 1;
			return (0);
		}
		total += isneg ? -val : val;
		ecp->clen -= (endp - ecp->cp);
		ecp->cp = endp;
	}
}
}

/*
* Any value less than 0 is an error.  Make sure that the new value
* will fit into a recno_t.
*/
if (*isaddrp && total != 0) {
if (total < 0) {
	if (-total > mp->lno) {
		msgq(sp, M_ERR,
	    "Reference to a line number less than 0");
		*errp = 1;
		return (0);
	}
} else
	if (!NPFITS(MAX_REC_NUMBER, mp->lno, total)(((unsigned long)(0xffffffff)) - (mp->lno) >= (total))) {
		ex_badaddr(sp, NULL((void *)0), A_NOTSET, NUM_OVER);
		*errp = 1;
		return (0);
	}
mp->lno += total;
}
return (0);
2034}


2037/*
* ex_load --
*	Load up the next command, which may be an @ buffer or global command.
*/
2041static int
2042ex_load(SCR *sp)
2043{
GS *gp;
EXCMD *ecp;
RANGE *rp;

F_CLR(sp, SC_EX_GLOBAL)(((sp)->flags) &= ~((0x00020000)));

/*
* Lose any exhausted commands.  We know that the first command
* can't be an AGV command, which makes things a bit easier.
*/
for (gp = sp->gp;;) {
/*
 * If we're back to the original structure, leave it around,
 * but discard any allocated source name, we've returned to
 * the beginning of the command stack.
 */
if ((ecp = LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first)) == &gp->excmd) {
	if (F_ISSET(ecp, E_NAMEDISCARD)(((ecp)->flags) & ((0x00001000)))) {
		free(ecp->if_name);
		ecp->if_name = NULL((void *)0);
	}
	return (0);
}

/*
 * ecp->clen will be 0 for the first discarded command, but
 * may not be 0 for subsequent ones, e.g. if the original
 * command was ":g/xx/@a|s/b/c/", then when we discard the
 * command pushed on the stack by the @a, we have to resume
 * the global command which included the substitute command.
 */
if (ecp->clen != 0)
	return (0);

/*
 * If it's an @, global or v command, we may need to continue
 * the command on a different line.
 */
if (FL_ISSET(ecp->agv_flags, AGV_ALL)((ecp->agv_flags) & ((0x01 | 0x02 | 0x04 | 0x08)))) {
	/* Discard any exhausted ranges. */
	while ((rp = TAILQ_FIRST(&ecp->rq)((&ecp->rq)->tqh_first))) {
		if (rp->start > rp->stop) {
			TAILQ_REMOVE(&ecp->rq, rp, q)do { if (((rp)->q.tqe_next) != ((void *)0)) (rp)->q.tqe_next
->q.tqe_prev = (rp)->q.tqe_prev; else (&ecp->rq)
->tqh_last = (rp)->q.tqe_prev; *(rp)->q.tqe_prev = (
rp)->q.tqe_next; ; ; } while (0);
			free(rp);
		} else
			break;
	}

	/* If there's another range, continue with it. */
	if (rp)
		break;

	/* If it's a global/v command, fix up the last line. */
	if (FL_ISSET(ecp->agv_flags,((ecp->agv_flags) & (0x04 | 0x08))
	    AGV_GLOBAL | AGV_V)((ecp->agv_flags) & (0x04 | 0x08)) && ecp->range_lno != OOBLNO0) {
		if (db_exist(sp, ecp->range_lno))
			sp->lno = ecp->range_lno;
		else {
			if (db_last(sp, &sp->lno))
				return (1);
			if (sp->lno == 0)
				sp->lno = 1;
		}
	}
	free(ecp->o_cp);
}

/* Discard the EXCMD. */
LIST_REMOVE(ecp, q)do { if ((ecp)->q.le_next != ((void *)0)) (ecp)->q.le_next
->q.le_prev = (ecp)->q.le_prev; *(ecp)->q.le_prev = (
ecp)->q.le_next; ; ; } while (0);
free(ecp);
}

/*
* We only get here if it's an active @, global or v command.  Set
* the current line number, and get a new copy of the command for
* the parser.  Note, the original pointer almost certainly moved,
* so we have play games.
*/
ecp->cp = ecp->o_cp;
memcpy(ecp->cp, ecp->cp + ecp->o_clen, ecp->o_clen);
ecp->clen = ecp->o_clen;
ecp->range_lno = sp->lno = rp->start++;

if (FL_ISSET(ecp->agv_flags, AGV_GLOBAL | AGV_V)((ecp->agv_flags) & (0x04 | 0x08)))
F_SET(sp, SC_EX_GLOBAL)(((sp)->flags) |= ((0x00020000)));
return (0);
2130}

2132/*
* ex_discard --
*	Discard any pending ex commands.
*/
2136static int
2137ex_discard(SCR *sp)
2138{
GS *gp;
EXCMD *ecp;
RANGE *rp;

/*
* We know the first command can't be an AGV command, so we don't
* process it specially.  We do, however, nail the command itself.
*/
for (gp = sp->gp; (ecp = LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first)) != &gp->excmd;) {
13
←
Loop condition is true.  Entering loop body→
20
←
Loop condition is false. Execution continues on line 2158→
if (FL_ISSET(ecp->agv_flags, AGV_ALL)((ecp->agv_flags) & ((0x01 | 0x02 | 0x04 | 0x08)))) {
14
←
Assuming the condition is false→
15
←
Taking false branch→
	while ((rp = TAILQ_FIRST(&ecp->rq)((&ecp->rq)->tqh_first))) {
		TAILQ_REMOVE(&ecp->rq, rp, q)do { if (((rp)->q.tqe_next) != ((void *)0)) (rp)->q.tqe_next
->q.tqe_prev = (rp)->q.tqe_prev; else (&ecp->rq)
->tqh_last = (rp)->q.tqe_prev; *(rp)->q.tqe_prev = (
rp)->q.tqe_next; ; ; } while (0);
		free(rp);
	}
	free(ecp->o_cp);
}
LIST_REMOVE(ecp, q)do { if ((ecp)->q.le_next != ((void *)0)) (ecp)->q.le_next
->q.le_prev = (ecp)->q.le_prev; *(ecp)->q.le_prev = (
ecp)->q.le_next; ; ; } while (0);
16
←
Assuming field 'le_next' is equal to null→
17
←
Taking false branch→
18
←
Loop condition is false.  Exiting loop→
free(ecp);
19
←
Memory is released→
}
LIST_FIRST(&gp->ecq)((&gp->ecq)->lh_first)->clen = 0;
21
←
Use of memory after it is freed
return (0);
2160}

2162/*
* ex_unknown --
*	Display an unknown command name.
*/
2166static void
2167ex_unknown(SCR *sp, char *cmd, size_t len)
2168{
size_t blen;
char *bp;

GET_SPACE_GOTO(sp, bp, blen, len + 1){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp
; if (L__gp == ((void *)0) || (((L__gp)->flags) & ((0x0100
)))) { (bp) = ((void *)0); (blen) = 0; { void *L__bincp; if (
((len + 1)) > ((blen))) { if ((L__bincp = binc(((sp)), ((bp
)), &((blen)), ((len + 1)))) == ((void *)0)) goto alloc_err
; ((bp)) = L__bincp; } }; } else { { void *L__bincp; if (((len
 + 1)) > (L__gp->tmp_blen)) { if ((L__bincp = binc(((sp
)), (L__gp->tmp_bp), &(L__gp->tmp_blen), ((len + 1)
))) == ((void *)0)) goto alloc_err; (L__gp->tmp_bp) = L__bincp
; } }; (bp) = L__gp->tmp_bp; (blen) = L__gp->tmp_blen; (
((L__gp)->flags) |= ((0x0100))); } };
bp[len] = '\0';
memcpy(bp, cmd, len);
msgq_str(sp, M_ERR, bp, "The %s command is unknown");
FREE_SPACE(sp, bp, blen){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp
; if (L__gp != ((void *)0) && (bp) == L__gp->tmp_bp
) (((L__gp)->flags) &= ~((0x0100))); else free(bp); };

2178alloc_err:
return;
2180}

2182/*
* ex_is_abbrev -
*	The vi text input routine needs to know if ex thinks this is an
*	[un]abbreviate command, so it can turn off abbreviations.  See
*	the usual ranting in the vi/v_txt_ev.c:txt_abbrev() routine.
*
* PUBLIC: int ex_is_abbrev(char *, size_t);
*/
2190int
2191ex_is_abbrev(char *name, size_t len)
2192{
EXCMDLIST const *cp;

return ((cp = ex_comm_search(name, len)) != NULL((void *)0) &&
   (cp == &cmds[C_ABBR] || cp == &cmds[C_UNABBREVIATE]));
2197}

2199/*
* ex_is_unmap -
*	The vi text input routine needs to know if ex thinks this is an
*	unmap command, so it can turn off input mapping.  See the usual
*	ranting in the vi/v_txt_ev.c:txt_unmap() routine.
*
* PUBLIC: int ex_is_unmap(char *, size_t);
*/
2207int
2208ex_is_unmap(char *name, size_t len)
2209{
EXCMDLIST const *cp;

/*
* The command the vi input routines are really interested in
* is "unmap!", not just unmap.
*/
if (name[len - 1] != '!')
return (0);
--len;
return ((cp = ex_comm_search(name, len)) != NULL((void *)0) &&
   cp == &cmds[C_UNMAP]);
2221}

2223/*
* ex_comm_search --
*	Search for a command name.
*/
2227static EXCMDLIST const *
2228ex_comm_search(char *name, size_t len)
2229{
EXCMDLIST const *cp;

for (cp = cmds; cp->name != NULL((void *)0); ++cp) {
if (cp->name[0] > name[0])
	return (NULL((void *)0));
if (cp->name[0] != name[0])
	continue;
if (!memcmp(name, cp->name, len))
	return (cp);
}
return (NULL((void *)0));
2241}

2243/*
* ex_badaddr --
*	Display a bad address message.
*
* PUBLIC: void ex_badaddr
* PUBLIC:(SCR *, EXCMDLIST const *, enum badaddr, enum nresult);
*/
2250void
2251ex_badaddr(SCR *sp, EXCMDLIST const *cp, enum badaddr ba, enum nresult nret)
2252{
recno_t lno;

switch (nret) {
case NUM_OK:
break;
case NUM_ERR:
msgq(sp, M_SYSERR, NULL((void *)0));
return;
case NUM_OVER:
msgq(sp, M_ERR, "Address value overflow");
return;
case NUM_UNDER:
msgq(sp, M_ERR, "Address value underflow");
return;
}

/*
* When encountering an address error, tell the user if there's no
* underlying file, that's the real problem.
*/
if (sp->ep == NULL((void *)0)) {
ex_emsg(sp, cp != NULL((void *)0) ? cp->name : NULL((void *)0), EXM_NOFILEYET);
return;
}

switch (ba) {
case A_COMBO:
msgq(sp, M_ERR, "Illegal address combination");
break;
case A_EOF:
if (db_last(sp, &lno))
	return;
if (lno != 0) {
	msgq(sp, M_ERR,
	    "Illegal address: only %lu lines in the file",
	    lno);
	break;
}
/* FALLTHROUGH */
case A_EMPTY:
msgq(sp, M_ERR, "Illegal address: the file is empty");
break;
case A_NOTSET:
abort();
/* NOTREACHED */
case A_ZERO:
msgq(sp, M_ERR,
    "The %s command doesn't permit an address of 0",
    cp->name);
break;
}
return;
2305}

2307#if defined(DEBUG) && defined(COMLOG)
2308/*
* ex_comlog --
*	Log ex commands.
*/
2312static void
2313ex_comlog(SCR *sp, EXCMD *ecp)
2314{
TRACE(sp, "ecmd: %s", ecp->cmd->name);
if (ecp->addrcnt > 0) {
TRACE(sp, " a1 %d", ecp->addr1.lno);
if (ecp->addrcnt > 1)
	TRACE(sp, " a2: %d", ecp->addr2.lno);
}
if (ecp->lineno)
TRACE(sp, " line %d", ecp->lineno);
if (ecp->flags)
TRACE(sp, " flags 0x%x", ecp->flags);
if (F_ISSET(&exc, E_BUFFER)(((&exc)->flags) & ((E_BUFFER))))
TRACE(sp, " buffer %c", ecp->buffer);
if (ecp->argc)
for (cnt = 0; cnt < ecp->argc; ++cnt)
	TRACE(sp, " arg %d: {%s}", cnt, ecp->argv[cnt]->bp);
TRACE(sp, "\n");
2331}
2332#endif