| Current Path : /usr/src/contrib/nvi/vi/ |
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/vi/v_search.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.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)v_search.c 10.18 (Berkeley) 9/19/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common/common.h"
#include "vi.h"
static int v_exaddr __P((SCR *, VICMD *, dir_t));
static int v_search __P((SCR *, VICMD *, char *, size_t, u_int, dir_t));
/*
* v_srch -- [count]?RE[? offset]
* Ex address search backward.
*
* PUBLIC: int v_searchb __P((SCR *, VICMD *));
*/
int
v_searchb(sp, vp)
SCR *sp;
VICMD *vp;
{
return (v_exaddr(sp, vp, BACKWARD));
}
/*
* v_searchf -- [count]/RE[/ offset]
* Ex address search forward.
*
* PUBLIC: int v_searchf __P((SCR *, VICMD *));
*/
int
v_searchf(sp, vp)
SCR *sp;
VICMD *vp;
{
return (v_exaddr(sp, vp, FORWARD));
}
/*
* v_exaddr --
* Do a vi search (which is really an ex address).
*/
static int
v_exaddr(sp, vp, dir)
SCR *sp;
VICMD *vp;
dir_t dir;
{
static EXCMDLIST fake = { "search" };
EXCMD *cmdp;
GS *gp;
TEXT *tp;
recno_t s_lno;
size_t len, s_cno, tlen;
int err, nb, type;
char *cmd, *t, buf[20];
/*
* !!!
* If using the search command as a motion, any addressing components
* are lost, i.e. y/ptrn/+2, when repeated, is the same as y/ptrn/.
*/
if (F_ISSET(vp, VC_ISDOT))
return (v_search(sp, vp,
NULL, 0, SEARCH_PARSE | SEARCH_MSG | SEARCH_SET, dir));
/* Get the search pattern. */
if (v_tcmd(sp, vp, dir == BACKWARD ? CH_BSEARCH : CH_FSEARCH,
TXT_BS | TXT_CR | TXT_ESCAPE | TXT_PROMPT |
(O_ISSET(sp, O_SEARCHINCR) ? TXT_SEARCHINCR : 0)))
return (1);
tp = sp->tiq.cqh_first;
/* If the user backspaced over the prompt, do nothing. */
if (tp->term == TERM_BS)
return (1);
/*
* If the user was doing an incremental search, then we've already
* updated the cursor and moved to the right location. Return the
* correct values, we're done.
*/
if (tp->term == TERM_SEARCH) {
vp->m_stop.lno = sp->lno;
vp->m_stop.cno = sp->cno;
if (ISMOTION(vp))
return (v_correct(sp, vp, 0));
vp->m_final = vp->m_stop;
return (0);
}
/*
* If the user entered <escape> or <carriage-return>, the length is
* 1 and the right thing will happen, i.e. the prompt will be used
* as a command character.
*
* Build a fake ex command structure.
*/
gp = sp->gp;
gp->excmd.cp = tp->lb;
gp->excmd.clen = tp->len;
F_INIT(&gp->excmd, E_VISEARCH);
/*
* XXX
* Warn if the search wraps. This is a pretty special case, but it's
* nice feature that wasn't in the original implementations of ex/vi.
* (It was added at some point to System V's version.) This message
* is only displayed if there are no keys in the queue. The problem is
* the command is going to succeed, and the message is informational,
* not an error. If a macro displays it repeatedly, e.g., the pattern
* only occurs once in the file and wrapscan is set, you lose big. For
* example, if the macro does something like:
*
* :map K /pattern/^MjK
*
* Each search will display the message, but the following "/pattern/"
* will immediately overwrite it, with strange results. The System V
* vi displays the "wrapped" message multiple times, but because it's
* overwritten each time, it's not as noticeable. As we don't discard
* messages, it's a real problem for us.
*/
if (!KEYS_WAITING(sp))
F_SET(&gp->excmd, E_SEARCH_WMSG);
/* Save the current line/column. */
s_lno = sp->lno;
s_cno = sp->cno;
/*
* !!!
* Historically, vi / and ? commands were full-blown ex addresses,
* including ';' delimiters, trailing <blank>'s, multiple search
* strings (separated by semi-colons) and, finally, full-blown z
* commands after the / and ? search strings. (If the search was
* being used as a motion, the trailing z command was ignored.
* Also, we do some argument checking on the z command, to be sure
* that it's not some other random command.) For multiple search
* strings, leading <blank>'s at the second and subsequent strings
* were eaten as well. This has some (unintended?) side-effects:
* the command /ptrn/;3 is legal and results in moving to line 3.
* I suppose you could use it to optionally move to line 3...
*
* !!!
* Historically, if any part of the search command failed, the cursor
* remained unmodified (even if ; was used). We have to play games
* because the underlying ex parser thinks we're modifying the cursor
* as we go, but I think we're compatible with historic practice.
*
* !!!
* Historically, the command "/STRING/; " failed, apparently it
* confused the parser. We're not that compatible.
*/
cmdp = &gp->excmd;
if (ex_range(sp, cmdp, &err))
return (1);
/*
* Remember where any remaining command information is, and clean
* up the fake ex command.
*/
cmd = cmdp->cp;
len = cmdp->clen;
gp->excmd.clen = 0;
if (err)
goto err2;
/* Copy out the new cursor position and make sure it's okay. */
switch (cmdp->addrcnt) {
case 1:
vp->m_stop = cmdp->addr1;
break;
case 2:
vp->m_stop = cmdp->addr2;
break;
}
if (!db_exist(sp, vp->m_stop.lno)) {
ex_badaddr(sp, &fake,
vp->m_stop.lno == 0 ? A_ZERO : A_EOF, NUM_OK);
goto err2;
}
/*
* !!!
* Historic practice is that a trailing 'z' was ignored if it was a
* motion command. Should probably be an error, but not worth the
* effort.
*/
if (ISMOTION(vp))
return (v_correct(sp, vp, F_ISSET(cmdp, E_DELTA)));
/*
* !!!
* Historically, if it wasn't a motion command, a delta in the search
* pattern turns it into a first nonblank movement.
*/
nb = F_ISSET(cmdp, E_DELTA);
/* Check for the 'z' command. */
if (len != 0) {
if (*cmd != 'z')
goto err1;
/* No blanks, just like the z command. */
for (t = cmd + 1, tlen = len - 1; tlen > 0; ++t, --tlen)
if (!isdigit(*t))
break;
if (tlen &&
(*t == '-' || *t == '.' || *t == '+' || *t == '^')) {
++t;
--tlen;
type = 1;
} else
type = 0;
if (tlen)
goto err1;
/* The z command will do the nonblank for us. */
nb = 0;
/* Default to z+. */
if (!type &&
v_event_push(sp, NULL, "+", 1, CH_NOMAP | CH_QUOTED))
return (1);
/* Push the user's command. */
if (v_event_push(sp, NULL, cmd, len, CH_NOMAP | CH_QUOTED))
return (1);
/* Push line number so get correct z display. */
tlen = snprintf(buf,
sizeof(buf), "%lu", (u_long)vp->m_stop.lno);
if (v_event_push(sp, NULL, buf, tlen, CH_NOMAP | CH_QUOTED))
return (1);
/* Don't refresh until after 'z' happens. */
F_SET(VIP(sp), VIP_S_REFRESH);
}
/* Non-motion commands move to the end of the range. */
vp->m_final = vp->m_stop;
if (nb) {
F_CLR(vp, VM_RCM_MASK);
F_SET(vp, VM_RCM_SETFNB);
}
return (0);
err1: msgq(sp, M_ERR,
"188|Characters after search string, line offset and/or z command");
err2: vp->m_final.lno = s_lno;
vp->m_final.cno = s_cno;
return (1);
}
/*
* v_searchN -- N
* Reverse last search.
*
* PUBLIC: int v_searchN __P((SCR *, VICMD *));
*/
int
v_searchN(sp, vp)
SCR *sp;
VICMD *vp;
{
dir_t dir;
switch (sp->searchdir) {
case BACKWARD:
dir = FORWARD;
break;
case FORWARD:
dir = BACKWARD;
break;
default:
dir = sp->searchdir;
break;
}
return (v_search(sp, vp, NULL, 0, SEARCH_PARSE, dir));
}
/*
* v_searchn -- n
* Repeat last search.
*
* PUBLIC: int v_searchn __P((SCR *, VICMD *));
*/
int
v_searchn(sp, vp)
SCR *sp;
VICMD *vp;
{
return (v_search(sp, vp, NULL, 0, SEARCH_PARSE, sp->searchdir));
}
/*
* v_searchw -- [count]^A
* Search for the word under the cursor.
*
* PUBLIC: int v_searchw __P((SCR *, VICMD *));
*/
int
v_searchw(sp, vp)
SCR *sp;
VICMD *vp;
{
size_t blen, len;
int rval;
char *bp;
len = VIP(sp)->klen + sizeof(RE_WSTART) + sizeof(RE_WSTOP);
GET_SPACE_RET(sp, bp, blen, len);
len = snprintf(bp, blen, "%s%s%s", RE_WSTART, VIP(sp)->keyw, RE_WSTOP);
rval = v_search(sp, vp, bp, len, SEARCH_SET, FORWARD);
FREE_SPACE(sp, bp, blen);
return (rval);
}
/*
* v_search --
* The search commands.
*/
static int
v_search(sp, vp, ptrn, plen, flags, dir)
SCR *sp;
VICMD *vp;
u_int flags;
char *ptrn;
size_t plen;
dir_t dir;
{
/* Display messages. */
LF_SET(SEARCH_MSG);
/* If it's a motion search, offset past end-of-line is okay. */
if (ISMOTION(vp))
LF_SET(SEARCH_EOL);
/*
* XXX
* Warn if the search wraps. See the comment above, in v_exaddr().
*/
if (!KEYS_WAITING(sp))
LF_SET(SEARCH_WMSG);
switch (dir) {
case BACKWARD:
if (b_search(sp,
&vp->m_start, &vp->m_stop, ptrn, plen, NULL, flags))
return (1);
break;
case FORWARD:
if (f_search(sp,
&vp->m_start, &vp->m_stop, ptrn, plen, NULL, flags))
return (1);
break;
case NOTSET:
msgq(sp, M_ERR, "189|No previous search pattern");
return (1);
default:
abort();
}
/* Correct motion commands, otherwise, simply move to the location. */
if (ISMOTION(vp)) {
if (v_correct(sp, vp, 0))
return(1);
} else
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_correct --
* Handle command with a search as the motion.
*
* !!!
* Historically, commands didn't affect the line searched to/from if the
* motion command was a search and the final position was the start/end
* of the line. There were some special cases and vi was not consistent;
* it was fairly easy to confuse it. For example, given the two lines:
*
* abcdefghi
* ABCDEFGHI
*
* placing the cursor on the 'A' and doing y?$ would so confuse it that 'h'
* 'k' and put would no longer work correctly. In any case, we try to do
* the right thing, but it's not going to exactly match historic practice.
*
* PUBLIC: int v_correct __P((SCR *, VICMD *, int));
*/
int
v_correct(sp, vp, isdelta)
SCR *sp;
VICMD *vp;
int isdelta;
{
dir_t dir;
MARK m;
size_t len;
/*
* !!!
* We may have wrapped if wrapscan was set, and we may have returned
* to the position where the cursor started. Historic vi didn't cope
* with this well. Yank wouldn't beep, but the first put after the
* yank would move the cursor right one column (without adding any
* text) and the second would put a copy of the current line. The
* change and delete commands would beep, but would leave the cursor
* on the colon command line. I believe that there are macros that
* depend on delete, at least, failing. For now, commands that use
* search as a motion component fail when the search returns to the
* original cursor position.
*/
if (vp->m_start.lno == vp->m_stop.lno &&
vp->m_start.cno == vp->m_stop.cno) {
msgq(sp, M_BERR, "190|Search wrapped to original position");
return (1);
}
/*
* !!!
* Searches become line mode operations if there was a delta specified
* to the search pattern.
*/
if (isdelta)
F_SET(vp, VM_LMODE);
/*
* If the motion is in the reverse direction, switch the start and
* stop MARK's so that it's in a forward direction. (There's no
* reason for this other than to make the tests below easier. The
* code in vi.c:vi() would have done the switch.) Both forward
* and backward motions can happen for any kind of search command
* because of the wrapscan option.
*/
if (vp->m_start.lno > vp->m_stop.lno ||
vp->m_start.lno == vp->m_stop.lno &&
vp->m_start.cno > vp->m_stop.cno) {
m = vp->m_start;
vp->m_start = vp->m_stop;
vp->m_stop = m;
dir = BACKWARD;
} else
dir = FORWARD;
/*
* BACKWARD:
* Delete and yank commands move to the end of the range.
* Ignore others.
*
* FORWARD:
* Delete and yank commands don't move. Ignore others.
*/
vp->m_final = vp->m_start;
/*
* !!!
* Delta'd searches don't correct based on column positions.
*/
if (isdelta)
return (0);
/*
* !!!
* Backward searches starting at column 0, and forward searches ending
* at column 0 are corrected to the last column of the previous line.
* Otherwise, adjust the starting/ending point to the character before
* the current one (this is safe because we know the search had to move
* to succeed).
*
* Searches become line mode operations if they start at the first
* nonblank and end at column 0 of another line.
*/
if (vp->m_start.lno < vp->m_stop.lno && vp->m_stop.cno == 0) {
if (db_get(sp, --vp->m_stop.lno, DBG_FATAL, NULL, &len))
return (1);
vp->m_stop.cno = len ? len - 1 : 0;
len = 0;
if (nonblank(sp, vp->m_start.lno, &len))
return (1);
if (vp->m_start.cno <= len)
F_SET(vp, VM_LMODE);
} else
--vp->m_stop.cno;
return (0);
}