| Current Path : /usr/src/contrib/nvi/ex/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/nvi/ex/ex.c |
/*-
* 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.
*/
/* $FreeBSD: release/9.1.0/contrib/nvi/ex/ex.c 51277 1999-09-14 14:34:58Z ru $ */
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)ex.c 10.57 (Berkeley) 10/10/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
#include "../vi/vi.h"
#if defined(DEBUG) && defined(COMLOG)
static void ex_comlog __P((SCR *, EXCMD *));
#endif
static EXCMDLIST const *
ex_comm_search __P((char *, size_t));
static int ex_discard __P((SCR *));
static int ex_line __P((SCR *, EXCMD *, MARK *, int *, int *));
static int ex_load __P((SCR *));
static void ex_unknown __P((SCR *, char *, size_t));
/*
* ex --
* Main ex loop.
*
* PUBLIC: int ex __P((SCR **));
*/
int
ex(spp)
SCR **spp;
{
EX_PRIVATE *exp;
GS *gp;
MSGS *mp;
SCR *sp;
TEXT *tp;
u_int32_t flags;
sp = *spp;
gp = sp->gp;
exp = EXP(sp);
/* Start the ex screen. */
if (ex_init(sp))
return (1);
/* Flush any saved messages. */
while ((mp = gp->msgq.lh_first) != NULL) {
gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
LIST_REMOVE(mp, q);
free(mp->buf);
free(mp);
}
/* If reading from a file, errors should have name and line info. */
if (F_ISSET(gp, G_SCRIPTED)) {
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);
for (;; ++gp->excmd.if_lno) {
/* Display status line and flush. */
if (F_ISSET(sp, SC_STATUS)) {
if (!F_ISSET(sp, SC_EX_SILENT))
msgq_status(sp, sp->lno, 0);
F_CLR(sp, SC_STATUS);
}
(void)ex_fflush(sp);
/* Set the flags the user can reset. */
if (O_ISSET(sp, O_BEAUTIFY))
LF_SET(TXT_BEAUTIFY);
if (O_ISSET(sp, O_PROMPT))
LF_SET(TXT_PROMPT);
/* Clear any current interrupts, and get a command. */
CLR_INTERRUPT(sp);
if (ex_txt(sp, &sp->tiq, ':', flags))
return (1);
if (INTERRUPTED(sp)) {
(void)ex_puts(sp, "\n");
(void)ex_fflush(sp);
continue;
}
/* Initialize the command structure. */
CLEAR_EX_PARSER(&gp->excmd);
/*
* If the user entered a single carriage return, send
* ex_cmd() a separator -- it discards single newlines.
*/
tp = sp->tiq.cqh_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);
if (ex_cmd(sp) && F_ISSET(gp, G_SCRIPTED))
return (1);
if (INTERRUPTED(sp)) {
CLR_INTERRUPT(sp);
msgq(sp, M_ERR, "170|Interrupted");
}
/*
* If the last command caused a restart, or switched screens
* or into vi, return.
*/
if (F_ISSET(gp, G_SRESTART) || F_ISSET(sp, SC_SSWITCH | SC_VI)) {
*spp = sp;
break;
}
/* If the last command switched files, we don't care. */
F_CLR(sp, SC_FSWITCH);
/*
* 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)) {
if (file_end(sp, NULL, F_ISSET(sp, SC_EXIT_FORCE)))
return (1);
*spp = screen_next(sp);
return (screen_end(sp));
}
}
return (0);
}
/*
* 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 __P((SCR *));
*/
int
ex_cmd(sp)
SCR *sp;
{
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);
/*
* 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.
*/
loop: ecp = gp->ecq.lh_first;
/* If we're reading a command from a file, set up error information. */
if (ecp->if_name != NULL) {
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)) {
if (db_last(sp, &sp->lno))
goto rfail;
sp->cno = 0;
F_CLR(ecp, E_MOVETOEND);
}
/* If we found a newline, increment the count now. */
if (F_ISSET(ecp, E_NEWLINE)) {
++gp->if_lno;
++ecp->if_lno;
F_CLR(ecp, E_NEWLINE);
}
/* (Re)initialize the EXCMD structure, preserving some flags. */
CLEAR_EX_CMD(ecp);
/* Initialize the argument structures. */
if (argv_init(sp, ecp))
goto err;
/* Initialize +cmd, saved command information. */
arg1 = NULL;
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->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) || F_ISSET(ecp, E_BLIGNORE))) {
if (ex_load(sp))
goto rfail;
ecp = 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->clen != 0 && (ecp->clen != 1 || ecp->cp[0] != '\004'))
F_CLR(ecp, E_NRSEP);
/* 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.
*/
#define SINGLE_CHAR_COMMANDS "\004!#&*<=>@~"
newscreen = 0;
if (ecp->clen != 0 && ecp->cp[0] != '|' && ecp->cp[0] != '\n') {
if (strchr(SINGLE_CHAR_COMMANDS, *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, "080|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)
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:
unknown: 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.
*/
skip_srch: if (ecp->cmd == &cmds[C_VISUAL_EX] && F_ISSET(sp, SC_VI))
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 == &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))
goto unknown;
/* Secure means no shell access. */
if (F_ISSET(ecp->cmd, E_SECURE) && O_ISSET(sp, O_SECURE)) {
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_HASH;
else if (ecp->cmd == &cmds[C_LIST])
exp->fdef = E_C_LIST;
else if (ecp->cmd == &cmds[C_PRINT])
exp->fdef = E_C_PRINT;
F_CLR(ecp, E_USELASTCMD);
} else {
/* Print is the default command. */
ecp->cmd = &cmds[C_PRINT];
/* Set the saved format flags. */
F_SET(ecp, 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)) {
ecp->addrcnt = 1;
ecp->addr1.lno = sp->lno + 1;
ecp->addr1.cno = sp->cno;
}
F_SET(ecp, E_USELASTCMD);
}
/*
* !!!
* 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)) {
F_SET(ecp, E_OPTNUM);
FL_SET(ecp->iflags, E_C_HASH);
} else
F_CLR(ecp, E_OPTNUM);
/* Check for ex mode legality. */
if (F_ISSET(sp, SC_EX) && (F_ISSET(ecp->cmd, E_VIONLY) || newscreen)) {
msgq(sp, M_ERR,
"082|%s: command not available in ex mode", ecp->cmd->name);
goto err;
}
/* Add standard command flags. */
F_SET(ecp, ecp->cmd->flags);
if (!newscreen)
F_CLR(ecp, E_NEWSCREEN);
/*
* 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);
/* 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->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->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->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;
/*
* 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)) {
case E_ADDR1: /* One address: */
switch (ecp->addrcnt) {
case 0: /* Default cursor/empty file. */
ecp->addrcnt = 1;
F_SET(ecp, E_ADDR_DEF);
if (F_ISSET(ecp, E_ADDR_ZERODEF)) {
if (db_last(sp, &lno))
goto err;
if (lno == 0) {
ecp->addr1.lno = 0;
F_SET(ecp, E_ADDR_ZERO);
} 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_NONE: /* Zero/two addresses: */
if (ecp->addrcnt == 0) /* Default to nothing. */
break;
goto two_addr;
case E_ADDR2_ALL: /* Zero/two addresses: */
if (ecp->addrcnt == 0) { /* Default entire/empty file. */
F_SET(ecp, E_ADDR_DEF);
ecp->addrcnt = 2;
if (sp->ep == NULL)
ecp->addr2.lno = 0;
else if (db_last(sp, &ecp->addr2.lno))
goto err;
if (F_ISSET(ecp, E_ADDR_ZERODEF) &&
ecp->addr2.lno == 0) {
ecp->addr1.lno = 0;
F_SET(ecp, E_ADDR_ZERO);
} else
ecp->addr1.lno = 1;
ecp->addr1.cno = ecp->addr2.cno = 0;
F_SET(ecp, E_ADDR2_ALL);
break;
}
/* FALLTHROUGH */
case E_ADDR2: /* Two addresses: */
two_addr: switch (ecp->addrcnt) {
case 0: /* Default cursor/empty file. */
ecp->addrcnt = 2;
F_SET(ecp, E_ADDR_DEF);
if (sp->lno == 1 &&
F_ISSET(ecp, E_ADDR_ZERODEF)) {
if (db_last(sp, &lno))
goto err;
if (lno == 0) {
ecp->addr1.lno = ecp->addr2.lno = 0;
F_SET(ecp, E_ADDR_ZERO);
} 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);
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);
}
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);
FL_SET(ecp->iflags, E_C_HASH);
exp->fdef |= E_C_HASH;
break;
case 'l':
FL_SET(ecp->iflags, E_C_LIST);
exp->fdef |= E_C_LIST;
break;
case 'p':
FL_SET(ecp->iflags, E_C_PRINT);
exp->fdef |= E_C_PRINT;
break;
default:
goto end_case1;
}
end_case1: break;
case '2': /* -, ., +, ^ */
case '3': /* -, ., +, ^, = */
for (; ecp->clen; --ecp->clen, ++ecp->cp)
switch (*ecp->cp) {
case '-':
FL_SET(ecp->iflags, E_C_DASH);
break;
case '.':
FL_SET(ecp->iflags, E_C_DOT);
break;
case '+':
FL_SET(ecp->iflags, E_C_PLUS);
break;
case '^':
FL_SET(ecp->iflags, E_C_CARAT);
break;
case '=':
if (*p == '3') {
FL_SET(ecp->iflags, E_C_EQUAL);
break;
}
/* FALLTHROUGH */
default:
goto end_case23;
}
end_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)
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);
}
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);
else if (*ecp->cp == '+')
FL_SET(ecp->iflags, E_C_COUNT_POS);
if ((nret =
nget_slong(<mp, ecp->cp, &t, 10)) != NUM_OK) {
ex_badaddr(sp, NULL, A_NOTSET, nret);
goto err;
}
if (ltmp == 0 && *p != '0') {
msgq(sp, M_ERR, "083|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);
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,
"084|%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, 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, ch) && 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, ch) && 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;
arg_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,
"085|Internal syntax table error (%s: %s)",
ecp->cmd->name, 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")) {
usage: msgq(sp, M_ERR, "086|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.
*/
addr_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) &&
(F_ISSET(sp, SC_EX) ||
!F_ISSET(ecp, E_USELASTCMD))) {
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)) {
if (db_last(sp, &lno))
goto err;
ecp->addr2.lno = lno;
} else {
ex_badaddr(sp, NULL, A_EOF, NUM_OK);
goto err;
}
/* FALLTHROUGH */
case 1:
if (ecp->addr1.lno == 0) {
if (!F_ISSET(ecp, E_ADDR_ZERO) &&
(F_ISSET(sp, SC_EX) ||
!F_ISSET(ecp, E_USELASTCMD))) {
ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK);
goto err;
}
} else if (!db_exist(sp, ecp->addr1.lno)) {
ex_badaddr(sp, NULL, 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) || F_ISSET(ecp, E_NOPRDEF)) &&
F_ISSET(ecp, E_USELASTCMD) && 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)) {
cur.lno = sp->lno;
cur.cno = sp->cno;
F_CLR(ecp, E_ABSMARK);
if (mark_set(sp, ABSMARK1, &cur, 1))
goto err;
}
#if defined(DEBUG) && defined(COMLOG)
ex_comlog(sp, ecp);
#endif
/* Increment the command count if not called from vi. */
if (F_ISSET(sp, SC_EX))
++sp->ccnt;
/*
* If file state available, and not doing a global command,
* log the start of an action.
*/
if (sp->ep != NULL && !F_ISSET(sp, SC_EX_GLOBAL))
(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)) {
if (sp->ep != NULL &&
F_ISSET(sp, SC_EX) && !F_ISSET(gp, G_SCRIPTED) &&
(F_ISSET(ecp, E_USELASTCMD) || ecp->cmd == &cmds[C_SCROLL]))
gp->scr_ex_adjust(sp, EX_TERM_SCROLL);
F_CLR(ecp, E_NRSEP);
}
/*
* Call the underlying function for the ex command.
*
* XXX
* Interrupts behave like errors, for now.
*/
if (ecp->cmd->fn(sp, ecp) || INTERRUPTED(sp)) {
if (F_ISSET(gp, G_SCRIPTED))
F_SET(sp, SC_EXIT_FORCE);
goto err;
}
#ifdef DEBUG
/* Make sure no function left global temporary space locked. */
if (F_ISSET(gp, G_TMP_INUSE)) {
F_CLR(gp, G_TMP_INUSE);
msgq(sp, M_ERR, "087|%s: temporary buffer not released",
ecp->cmd->name);
}
#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))
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 && ecp->flagoff) {
if (ecp->flagoff < 0) {
if (sp->lno <= -ecp->flagoff) {
msgq(sp, M_ERR,
"088|Flag offset to before line 1");
goto err;
}
} else {
if (!NPFITS(MAX_REC_NUMBER, sp->lno, ecp->flagoff)) {
ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER);
goto err;
}
if (!db_exist(sp, sp->lno + ecp->flagoff)) {
msgq(sp, M_ERR,
"089|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->ep != NULL && sp->lno != 0) {
/*
* The print commands have already handled the `print' flags.
* If so, clear them.
*/
if (FL_ISSET(ecp->iflags, E_CLRFLAG))
FL_CLR(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT);
/* If hash set only because of the number option, discard it. */
if (F_ISSET(ecp, E_OPTNUM))
FL_CLR(ecp->iflags, E_C_HASH);
/*
* 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));
if (!LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT | E_NOAUTO) &&
!F_ISSET(sp, SC_EX_GLOBAL) &&
O_ISSET(sp, O_AUTOPRINT) && F_ISSET(ecp, E_AUTOPRINT))
LF_INIT(E_C_PRINT);
if (LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT)) {
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->save_cmd = CH_LITERAL;
++ecp->save_cmdlen;
}
ecp->save_cmd -= arg1_len;
ecp->save_cmdlen += arg1_len;
memcpy(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);
}
/* 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)) {
at_found = gv_found = 0;
for (ecp = sp->gp->ecq.lh_first;
ecp != NULL; ecp = ecp->q.le_next)
switch (ecp->agv_flags) {
case 0:
case AGV_AT_NORANGE:
break;
case AGV_AT:
if (!at_found) {
at_found = 1;
msgq(sp, M_ERR,
"090|@ with range running when the file/screen changed");
}
break;
case AGV_GLOBAL:
case AGV_V:
if (!gv_found) {
gv_found = 1;
msgq(sp, M_ERR,
"091|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))
goto rsuccess;
}
goto loop;
/* NOTREACHED */
err: /*
* 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)
for (; ecp->clen; --ecp->clen) {
ch = *ecp->cp++;
if (IS_ESCAPE(sp, ecp, ch) && ecp->clen > 1) {
--ecp->clen;
++ecp->cp;
} else if (ch == '\n' || ch == '|') {
if (ecp->clen > 1)
ecp->save_cmdlen = 1;
break;
}
}
if (ecp->save_cmdlen != 0 || gp->ecq.lh_first != &gp->excmd) {
discard: msgq(sp, M_BERR,
"092|Ex command failed: pending commands discarded");
ex_discard(sp);
}
if (v_event_flush(sp, CH_MAPPED))
msgq(sp, M_BERR,
"093|Ex command failed: mapped keys discarded");
rfail: tmp = 1;
if (0)
rsuccess: tmp = 0;
/* Turn off any file name error information. */
gp->if_name = NULL;
/* Turn off the global bit. */
F_CLR(sp, SC_EX_GLOBAL);
return (tmp);
}
/*
* ex_range --
* Get a line range for ex commands, or perform a vi ex address search.
*
* PUBLIC: int ex_range __P((SCR *, EXCMD *, int *));
*/
int
ex_range(sp, ecp, errp)
SCR *sp;
EXCMD *ecp;
int *errp;
{
enum { ADDR_FOUND, ADDR_NEED, ADDR_NONE } addr;
GS *gp;
EX_PRIVATE *exp;
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.
*/
gp = sp->gp;
exp = EXP(sp);
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))
goto ret;
/* It's an error if the file is empty. */
if (sp->ep == NULL) {
ex_badaddr(sp, NULL, 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, 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))
goto ret;
/* FALLTHROUGH */
case ';': /* Semi-colon delimiter. */
if (sp->ep == NULL) {
ex_badaddr(sp, NULL, 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, 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.
*/
ret: if (F_ISSET(ecp, E_VISEARCH))
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,
"094|The second address is smaller than the first");
*errp = 1;
}
return (0);
}
/*
* 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.
*/
static int
ex_line(sp, ecp, mp, isaddrp, errp)
SCR *sp;
EXCMD *ecp;
MARK *mp;
int *isaddrp, *errp;
{
enum nresult nret;
EX_PRIVATE *exp;
GS *gp;
long total, val;
int isneg;
int (*sf) __P((SCR *, MARK *, MARK *, char *, size_t, char **, u_int));
char *endp;
gp = sp->gp;
exp = EXP(sp);
*isaddrp = *errp = 0;
F_CLR(ecp, E_DELTA);
/* No addresses permitted until a file has been read in. */
if (sp->ep == NULL && strchr("$0123456789'\\/?.+-^", *ecp->cp)) {
ex_badaddr(sp, NULL, A_EMPTY, NUM_OK);
*errp = 1;
return (0);
}
switch (*ecp->cp) {
case '$': /* Last line in the file. */
*isaddrp = 1;
F_SET(ecp, E_ABSMARK);
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);
if ((nret = nget_slong(&val, ecp->cp, &endp, 10)) != NUM_OK) {
ex_badaddr(sp, NULL, A_NOTSET, nret);
*errp = 1;
return (0);
}
if (!NPFITS(MAX_REC_NUMBER, 0, val)) {
ex_badaddr(sp, NULL, 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);
if (ecp->clen == 1) {
msgq(sp, M_ERR, "095|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, "096|\\ 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;
search: mp->lno = sp->lno;
mp->cno = sp->cno;
if (sf(sp, mp, mp, ecp->cp, ecp->clen, &endp,
SEARCH_MSG | SEARCH_PARSE | SEARCH_SET |
(F_ISSET(ecp, E_SEARCH_WMSG) ? SEARCH_WMSG : 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);
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);
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(sp,
total, val)) != NUM_OK) {
ex_badaddr(sp, NULL, 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,
"097|Reference to a line number less than 0");
*errp = 1;
return (0);
}
} else
if (!NPFITS(MAX_REC_NUMBER, mp->lno, total)) {
ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER);
*errp = 1;
return (0);
}
mp->lno += total;
}
return (0);
}
/*
* ex_load --
* Load up the next command, which may be an @ buffer or global command.
*/
static int
ex_load(sp)
SCR *sp;
{
GS *gp;
EXCMD *ecp;
RANGE *rp;
F_CLR(sp, SC_EX_GLOBAL);
/*
* 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 = gp->ecq.lh_first) == &gp->excmd) {
if (F_ISSET(ecp, E_NAMEDISCARD)) {
free(ecp->if_name);
ecp->if_name = NULL;
}
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)) {
/* Discard any exhausted ranges. */
while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq)
if (rp->start > rp->stop) {
CIRCLEQ_REMOVE(&ecp->rq, rp, q);
free(rp);
} else
break;
/* If there's another range, continue with it. */
if (rp != (void *)&ecp->rq)
break;
/* If it's a global/v command, fix up the last line. */
if (FL_ISSET(ecp->agv_flags,
AGV_GLOBAL | AGV_V) && ecp->range_lno != OOBLNO)
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);
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))
F_SET(sp, SC_EX_GLOBAL);
return (0);
}
/*
* ex_discard --
* Discard any pending ex commands.
*/
static int
ex_discard(sp)
SCR *sp;
{
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 = gp->ecq.lh_first) != &gp->excmd;) {
if (FL_ISSET(ecp->agv_flags, AGV_ALL)) {
while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq) {
CIRCLEQ_REMOVE(&ecp->rq, rp, q);
free(rp);
}
free(ecp->o_cp);
}
LIST_REMOVE(ecp, q);
free(ecp);
}
gp->ecq.lh_first->clen = 0;
return (0);
}
/*
* ex_unknown --
* Display an unknown command name.
*/
static void
ex_unknown(sp, cmd, len)
SCR *sp;
char *cmd;
size_t len;
{
size_t blen;
char *bp;
GET_SPACE_GOTO(sp, bp, blen, len + 1);
bp[len] = '\0';
memcpy(bp, cmd, len);
msgq_str(sp, M_ERR, bp, "098|The %s command is unknown");
FREE_SPACE(sp, bp, blen);
alloc_err:
return;
}
/*
* 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 __P((char *, size_t));
*/
int
ex_is_abbrev(name, len)
char *name;
size_t len;
{
EXCMDLIST const *cp;
return ((cp = ex_comm_search(name, len)) != NULL &&
(cp == &cmds[C_ABBR] || cp == &cmds[C_UNABBREVIATE]));
}
/*
* 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 __P((char *, size_t));
*/
int
ex_is_unmap(name, len)
char *name;
size_t len;
{
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 &&
cp == &cmds[C_UNMAP]);
}
/*
* ex_comm_search --
* Search for a command name.
*/
static EXCMDLIST const *
ex_comm_search(name, len)
char *name;
size_t len;
{
EXCMDLIST const *cp;
for (cp = cmds; cp->name != NULL; ++cp) {
if (cp->name[0] > name[0])
return (NULL);
if (cp->name[0] != name[0])
continue;
if (!memcmp(name, cp->name, len))
return (cp);
}
return (NULL);
}
/*
* ex_badaddr --
* Display a bad address message.
*
* PUBLIC: void ex_badaddr
* PUBLIC: __P((SCR *, EXCMDLIST const *, enum badaddr, enum nresult));
*/
void
ex_badaddr(sp, cp, ba, nret)
SCR *sp;
EXCMDLIST const *cp;
enum badaddr ba;
enum nresult nret;
{
recno_t lno;
switch (nret) {
case NUM_OK:
break;
case NUM_ERR:
msgq(sp, M_SYSERR, NULL);
return;
case NUM_OVER:
msgq(sp, M_ERR, "099|Address value overflow");
return;
case NUM_UNDER:
msgq(sp, M_ERR, "100|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) {
ex_emsg(sp, cp ? cp->name : NULL, EXM_NOFILEYET);
return;
}
switch (ba) {
case A_COMBO:
msgq(sp, M_ERR, "101|Illegal address combination");
break;
case A_EOF:
if (db_last(sp, &lno))
return;
if (lno != 0) {
msgq(sp, M_ERR,
"102|Illegal address: only %lu lines in the file",
lno);
break;
}
/* FALLTHROUGH */
case A_EMPTY:
msgq(sp, M_ERR, "103|Illegal address: the file is empty");
break;
case A_NOTSET:
abort();
/* NOTREACHED */
case A_ZERO:
msgq(sp, M_ERR,
"104|The %s command doesn't permit an address of 0",
cp->name);
break;
}
return;
}
#if defined(DEBUG) && defined(COMLOG)
/*
* ex_comlog --
* Log ex commands.
*/
static void
ex_comlog(sp, ecp)
SCR *sp;
EXCMD *ecp;
{
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))
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");
}
#endif