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NetBSD/usr.bin/vi/search.c

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/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
/* from: static char sccsid[] = "@(#)search.c 8.32 (Berkeley) 1/9/94"; */
static char *rcsid = "$Id: search.c,v 1.2 1994/01/24 06:39:12 cgd Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "vi.h"
#include "interrupt.h"
static int check_delta __P((SCR *, EXF *, long, recno_t));
static int ctag_conv __P((SCR *, char **, int *));
static int get_delta __P((SCR *, char **, long *, u_int *));
static int resetup __P((SCR *, regex_t **, enum direction,
char *, char **, long *, u_int *));
static void search_intr __P((int));
/*
* resetup --
* Set up a search for a regular expression.
*/
static int
resetup(sp, rep, dir, ptrn, epp, deltap, flagp)
SCR *sp;
regex_t **rep;
enum direction dir;
char *ptrn, **epp;
long *deltap;
u_int *flagp;
{
u_int flags;
int delim, eval, re_flags, replaced;
char *p, *t;
/* Set return information the default. */
*deltap = 0;
/*
* Use saved pattern if no pattern supplied, or if only a delimiter
* character is supplied. Only the pattern was saved, historic vi
* did not reuse any delta supplied.
*/
flags = *flagp;
if (ptrn == NULL)
goto prev;
if (ptrn[1] == '\0') {
if (epp != NULL)
*epp = ptrn + 1;
goto prev;
}
if (ptrn[0] == ptrn[1] && ptrn[2] == '\0') {
if (epp != NULL)
*epp = ptrn + 2;
prev: if (!F_ISSET(sp, S_SRE_SET)) {
msgq(sp, M_ERR, "No previous search pattern.");
return (1);
}
*rep = &sp->sre;
/* Empty patterns set the direction. */
if (LF_ISSET(SEARCH_SET)) {
F_SET(sp, S_SRE_SET);
sp->searchdir = dir;
sp->sre = **rep;
}
return (0);
}
re_flags = 0; /* Set RE flags. */
if (O_ISSET(sp, O_EXTENDED))
re_flags |= REG_EXTENDED;
if (O_ISSET(sp, O_IGNORECASE))
re_flags |= REG_ICASE;
if (LF_ISSET(SEARCH_PARSE)) { /* Parse the string. */
/* Set delimiter. */
delim = *ptrn++;
/* Find terminating delimiter, handling escaped delimiters. */
for (p = t = ptrn;;) {
if (p[0] == '\0' || p[0] == delim) {
if (p[0] == delim)
++p;
*t = '\0';
break;
}
if (p[1] == delim && p[0] == '\\')
++p;
*t++ = *p++;
}
/*
* If characters after the terminating delimiter, it may
* be an error, or may be an offset. In either case, we
* return the end of the string, whatever it may be.
*/
if (*p) {
if (get_delta(sp, &p, deltap, flagp))
return (1);
if (*p && LF_ISSET(SEARCH_TERM)) {
msgq(sp, M_ERR,
"Characters after search string and/or delta.");
return (1);
}
}
if (epp != NULL)
*epp = p;
/* Check for "/ " or other such silliness. */
if (*ptrn == '\0')
goto prev;
if (re_conv(sp, &ptrn, &replaced))
return (1);
} else if (LF_ISSET(SEARCH_TAG)) {
if (ctag_conv(sp, &ptrn, &replaced))
return (1);
re_flags &= ~(REG_EXTENDED | REG_ICASE);
}
/* Compile the RE. */
if (eval = regcomp(*rep, ptrn, re_flags))
re_error(sp, eval, *rep);
else if (LF_ISSET(SEARCH_SET)) {
F_SET(sp, S_SRE_SET);
sp->searchdir = dir;
sp->sre = **rep;
}
/* Free up any extra memory. */
if (replaced)
FREE_SPACE(sp, ptrn, 0);
return (eval);
}
/*
* ctag_conv --
* Convert a tags search path into something that the POSIX
* 1003.2 RE functions can handle.
*/
static int
ctag_conv(sp, ptrnp, replacedp)
SCR *sp;
char **ptrnp;
int *replacedp;
{
size_t blen, len;
int lastdollar;
char *bp, *p, *t;
*replacedp = 0;
len = strlen(p = *ptrnp);
/* Max memory usage is 2 times the length of the string. */
GET_SPACE_RET(sp, bp, blen, len * 2);
t = bp;
/* The last charcter is a '/' or '?', we just strip it. */
if (p[len - 1] == '/' || p[len - 1] == '?')
p[len - 1] = '\0';
/* The next-to-last character is a '$', and it's magic. */
if (p[len - 2] == '$') {
lastdollar = 1;
p[len - 2] = '\0';
} else
lastdollar = 0;
/* The first character is a '/' or '?', we just strip it. */
if (p[0] == '/' || p[0] == '?')
++p;
/* The second character is a '^', and it's magic. */
if (p[0] == '^')
*t++ = *p++;
/*
* Escape every other magic character we can find, stripping the
* backslashes ctags inserts to escape the search delimiter
* characters.
*/
while (p[0]) {
/* Ctags escapes the search delimiter characters. */
if (p[0] == '\\' && (p[1] == '/' || p[1] == '?'))
++p;
else if (strchr("^.[]$*", p[0]))
*t++ = '\\';
*t++ = *p++;
}
if (lastdollar)
*t++ = '$';
*t++ = '\0';
*ptrnp = bp;
*replacedp = 1;
return (0);
}
/*
* search_intr --
* Set the interrupt bit in any screen that is interruptible.
*
* XXX
* In the future this may be a problem. The user should be able to move to
* another screen and keep typing while this runs. If so, and the user has
* more than one search/global (see ex/ex_global.c) running, it will be hard
* to decide which one to stop.
*/
static void
search_intr(signo)
int signo;
{
SCR *sp;
for (sp = __global_list->dq.cqh_first;
sp != (void *)&__global_list->dq; sp = sp->q.cqe_next)
if (F_ISSET(sp, S_INTERRUPTIBLE))
F_SET(sp, S_INTERRUPTED);
}
#define EMPTYMSG "File empty; nothing to search."
#define EOFMSG "Reached end-of-file without finding the pattern."
#define NOTFOUND "Pattern not found."
#define SOFMSG "Reached top-of-file without finding the pattern."
#define WRAPMSG "Search wrapped."
int
f_search(sp, ep, fm, rm, ptrn, eptrn, flagp)
SCR *sp;
EXF *ep;
MARK *fm, *rm;
char *ptrn, **eptrn;
u_int *flagp;
{
DECLARE_INTERRUPTS;
regmatch_t match[1];
regex_t *re, lre;
recno_t lno;
size_t coff, len;
long delta;
u_int flags;
int eval, rval, wrapped;
char *l;
if (file_lline(sp, ep, &lno))
return (1);
flags = *flagp;
if (lno == 0) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, EMPTYMSG);
return (1);
}
re = &lre;
if (resetup(sp, &re, FORWARD, ptrn, eptrn, &delta, flagp))
return (1);
/*
* Start searching immediately after the cursor. If at the end of the
* line, start searching on the next line. This is incompatible (read
* bug fix) with the historic vi -- searches for the '$' pattern never
* moved forward, and "-t foo" didn't work if "foo" was the first thing
* in the file.
*/
if (LF_ISSET(SEARCH_FILE)) {
lno = 1;
coff = 0;
} else {
if ((l = file_gline(sp, ep, fm->lno, &len)) == NULL) {
GETLINE_ERR(sp, fm->lno);
return (1);
}
if (fm->cno + 1 >= len) {
if (fm->lno == lno) {
if (!O_ISSET(sp, O_WRAPSCAN)) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, EOFMSG);
return (1);
}
lno = 1;
} else
lno = fm->lno + 1;
coff = 0;
} else {
lno = fm->lno;
coff = fm->cno + 1;
}
}
/*
* Set up busy message, interrupts.
*
* F_search is called from the ex_tagfirst() routine, which runs
* before the screen really exists. Make sure we don't step on
* anything.
*/
if (sp->s_position != NULL)
busy_on(sp, 1, "Searching...");
SET_UP_INTERRUPTS(search_intr);
for (rval = 1, wrapped = 0;; ++lno, coff = 0) {
if (F_ISSET(sp, S_INTERRUPTED)) {
msgq(sp, M_INFO, "Interrupted.");
break;
}
if (wrapped && lno > fm->lno ||
(l = file_gline(sp, ep, lno, &len)) == NULL) {
if (wrapped) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, NOTFOUND);
break;
}
if (!O_ISSET(sp, O_WRAPSCAN)) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, EOFMSG);
break;
}
lno = 0;
wrapped = 1;
continue;
}
/* If already at EOL, just keep going. */
if (len && coff == len)
continue;
/* Set the termination. */
match[0].rm_so = coff;
match[0].rm_eo = len;
#if defined(DEBUG) && 0
TRACE(sp, "F search: %lu from %u to %u\n",
lno, coff, len ? len - 1 : len);
#endif
/* Search the line. */
eval = regexec(re, l, 1, match,
(match[0].rm_so == 0 ? 0 : REG_NOTBOL) | REG_STARTEND);
if (eval == REG_NOMATCH)
continue;
if (eval != 0) {
re_error(sp, eval, re);
break;
}
/* Warn if wrapped. */
if (wrapped && O_ISSET(sp, O_WARN) && LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, WRAPMSG);
/*
* If an offset, see if it's legal. It's possible to match
* past the end of the line with $, so check for that case.
*/
if (delta) {
if (check_delta(sp, ep, delta, lno))
break;
rm->lno = delta + lno;
rm->cno = 0;
} else {
#if defined(DEBUG) && 0
TRACE(sp, "found: %qu to %qu\n",
match[0].rm_so, match[0].rm_eo);
#endif
rm->lno = lno;
rm->cno = match[0].rm_so;
/*
* If a change command, it's possible to move beyond
* the end of a line. Historic vi generally got this
* wrong (try "c?$<cr>"). Not all that sure this gets
* it right, there are lots of strange cases.
*/
if (!LF_ISSET(SEARCH_EOL) && rm->cno >= len)
rm->cno = len ? len - 1 : 0;
}
rval = 0;
break;
}
interrupt_err:
/* Turn off busy message, interrupts. */
if (sp->s_position != NULL)
busy_off(sp);
TEAR_DOWN_INTERRUPTS;
return (rval);
}
int
b_search(sp, ep, fm, rm, ptrn, eptrn, flagp)
SCR *sp;
EXF *ep;
MARK *fm, *rm;
char *ptrn, **eptrn;
u_int *flagp;
{
DECLARE_INTERRUPTS;
regmatch_t match[1];
regex_t *re, lre;
recno_t lno;
size_t coff, len, last;
long delta;
u_int flags;
int eval, rval, wrapped;
char *l;
if (file_lline(sp, ep, &lno))
return (1);
flags = *flagp;
if (lno == 0) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, EMPTYMSG);
return (1);
}
re = &lre;
if (resetup(sp, &re, BACKWARD, ptrn, eptrn, &delta, flagp))
return (1);
/* If in the first column, start searching on the previous line. */
if (fm->cno == 0) {
if (fm->lno == 1) {
if (!O_ISSET(sp, O_WRAPSCAN)) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, SOFMSG);
return (1);
}
} else
lno = fm->lno - 1;
} else
lno = fm->lno;
/* Turn on busy message, interrupts. */
busy_on(sp, 1, "Searching...");
if (F_ISSET(sp->gp, G_ISFROMTTY))
SET_UP_INTERRUPTS(search_intr);
for (rval = 1, wrapped = 0, coff = fm->cno;; --lno, coff = 0) {
if (F_ISSET(sp, S_INTERRUPTED)) {
msgq(sp, M_INFO, "Interrupted.");
break;
}
if (wrapped && lno < fm->lno || lno == 0) {
if (wrapped) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, NOTFOUND);
break;
}
if (!O_ISSET(sp, O_WRAPSCAN)) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, SOFMSG);
break;
}
if (file_lline(sp, ep, &lno))
goto err;
if (lno == 0) {
if (LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, EMPTYMSG);
break;
}
++lno;
wrapped = 1;
continue;
}
if ((l = file_gline(sp, ep, lno, &len)) == NULL)
goto err;
/* Set the termination. */
match[0].rm_so = 0;
match[0].rm_eo = coff ? coff : len;
#if defined(DEBUG) && 0
TRACE(sp, "B search: %lu from 0 to %qu\n", lno, match[0].rm_eo);
#endif
/* Search the line. */
eval = regexec(re, l, 1, match,
(match[0].rm_eo == len ? 0 : REG_NOTEOL) | REG_STARTEND);
if (eval == REG_NOMATCH)
continue;
if (eval != 0) {
re_error(sp, eval, re);
break;
}
/* Warn if wrapped. */
if (wrapped && O_ISSET(sp, O_WARN) && LF_ISSET(SEARCH_MSG))
msgq(sp, M_INFO, WRAPMSG);
if (delta) {
if (check_delta(sp, ep, delta, lno))
break;
rm->lno = delta + lno;
rm->cno = 0;
} else {
#if defined(DEBUG) && 0
TRACE(sp, "found: %qu to %qu\n",
match[0].rm_so, match[0].rm_eo);
#endif
/*
* Find the last acceptable one in this line. This
* is really painful, we need a cleaner interface to
* regexec to make this possible.
*/
for (;;) {
last = match[0].rm_so;
match[0].rm_so = match[0].rm_eo + 1;
if (match[0].rm_so >= len ||
coff && match[0].rm_so >= coff)
break;
match[0].rm_eo = coff ? coff : len;
eval = regexec(re, l, 1, match,
(match[0].rm_so == 0 ? 0 : REG_NOTBOL) |
REG_STARTEND);
if (eval == REG_NOMATCH)
break;
if (eval != 0) {
re_error(sp, eval, re);
goto err;
}
}
rm->lno = lno;
/* See comment in f_search(). */
if (!LF_ISSET(SEARCH_EOL) && last >= len)
rm->cno = len ? len - 1 : 0;
else
rm->cno = last;
}
rval = 0;
break;
}
/* Turn off busy message, interrupts. */
interrupt_err:
err: busy_off(sp);
if (F_ISSET(sp->gp, G_ISFROMTTY))
TEAR_DOWN_INTERRUPTS;
return (rval);
}
/*
* re_conv --
* Convert vi's regular expressions into something that the
* the POSIX 1003.2 RE functions can handle.
*
* There are three conversions we make to make vi's RE's (specifically
* the global, search, and substitute patterns) work with POSIX RE's.
*
* 1: If O_MAGIC is not set, strip backslashes from the magic character
* set (.[]*~) that have them, and add them to the ones that don't.
* 2: If O_MAGIC is not set, the string "\~" is replaced with the text
* from the last substitute command's replacement string. If O_MAGIC
* is set, it's the string "~".
* 3: The pattern \<ptrn\> does "word" searches, convert it to use the
* new RE escapes.
*/
int
re_conv(sp, ptrnp, replacedp)
SCR *sp;
char **ptrnp;
int *replacedp;
{
size_t blen, needlen;
int magic;
char *bp, *p, *t;
/*
* First pass through, we figure out how much space we'll need.
* We do it in two passes, on the grounds that most of the time
* the user is doing a search and won't have magic characters.
* That way we can skip the malloc and memmove's.
*/
for (p = *ptrnp, magic = 0, needlen = 0; *p != '\0'; ++p)
switch (*p) {
case '\\':
switch (*++p) {
case '<':
magic = 1;
needlen += sizeof(RE_WSTART);
break;
case '>':
magic = 1;
needlen += sizeof(RE_WSTOP);
break;
case '~':
if (!O_ISSET(sp, O_MAGIC)) {
magic = 1;
needlen += sp->repl_len;
}
break;
case '.':
case '[':
case ']':
case '*':
if (!O_ISSET(sp, O_MAGIC)) {
magic = 1;
needlen += 1;
}
break;
default:
needlen += 2;
}
break;
case '~':
if (O_ISSET(sp, O_MAGIC)) {
magic = 1;
needlen += sp->repl_len;
}
break;
case '.':
case '[':
case ']':
case '*':
if (!O_ISSET(sp, O_MAGIC)) {
magic = 1;
needlen += 2;
}
break;
default:
needlen += 1;
break;
}
if (!magic) {
*replacedp = 0;
return (0);
}
/*
* Get enough memory to hold the final pattern.
*
* XXX
* It's nul-terminated, for now.
*/
GET_SPACE_RET(sp, bp, blen, needlen + 1);
for (p = *ptrnp, t = bp; *p != '\0'; ++p)
switch (*p) {
case '\\':
switch (*++p) {
case '<':
memmove(t, RE_WSTART, sizeof(RE_WSTART) - 1);
t += sizeof(RE_WSTART) - 1;
break;
case '>':
memmove(t, RE_WSTOP, sizeof(RE_WSTOP) - 1);
t += sizeof(RE_WSTOP) - 1;
break;
case '~':
if (O_ISSET(sp, O_MAGIC))
*t++ = '~';
else {
memmove(t, sp->repl, sp->repl_len);
t += sp->repl_len;
}
break;
case '.':
case '[':
case ']':
case '*':
if (O_ISSET(sp, O_MAGIC))
*t++ = '\\';
*t++ = *p;
break;
default:
*t++ = '\\';
*t++ = *p;
}
break;
case '~':
if (O_ISSET(sp, O_MAGIC)) {
memmove(t, sp->repl, sp->repl_len);
t += sp->repl_len;
} else
*t++ = '~';
break;
case '.':
case '[':
case ']':
case '*':
if (!O_ISSET(sp, O_MAGIC))
*t++ = '\\';
*t++ = *p;
break;
default:
*t++ = *p;
break;
}
*t = '\0';
*ptrnp = bp;
*replacedp = 1;
return (0);
}
/*
* get_delta --
* Get a line delta. The trickiness is that the delta can be pretty
* complicated, i.e. "+3-2+3++- ++" is allowed.
*
* !!!
* In historic vi, if you had a delta on a search pattern which was used as
* a motion command, the command became a line mode command regardless of the
* cursor positions. A fairly common trick is to use a delta of "+0" to make
* the command a line mode command. This is the only place that knows about
* delta's, so we set the return flag information here.
*/
static int
get_delta(sp, dp, valp, flagp)
SCR *sp;
char **dp;
long *valp;
u_int *flagp;
{
char *p;
long val, tval;
for (tval = 0, p = *dp; *p != '\0'; *flagp |= SEARCH_DELTA) {
if (isblank(*p)) {
++p;
continue;
}
if (*p == '+' || *p == '-') {
if (!isdigit(*(p + 1))) {
if (*p == '+') {
if (tval == LONG_MAX)
goto overflow;
++tval;
} else {
if (tval == LONG_MIN)
goto underflow;
--tval;
}
++p;
continue;
}
} else
if (!isdigit(*p))
break;
errno = 0;
val = strtol(p, &p, 10);
if (errno == ERANGE) {
if (val == LONG_MAX)
overflow: msgq(sp, M_ERR, "Delta value overflow.");
else if (val == LONG_MIN)
underflow: msgq(sp, M_ERR, "Delta value underflow.");
else
msgq(sp, M_SYSERR, NULL);
return (1);
}
if (val >= 0) {
if (LONG_MAX - val < tval)
goto overflow;
} else
if (-(LONG_MIN - tval) > val)
goto underflow;
tval += val;
}
*dp = p;
*valp = tval;
return (0);
}
/*
* check_delta --
* Check a line delta to see if it's legal.
*/
static int
check_delta(sp, ep, delta, lno)
SCR *sp;
EXF *ep;
long delta;
recno_t lno;
{
/* A delta can overflow a record number. */
if (delta < 0) {
if (lno < LONG_MAX && delta >= (long)lno) {
msgq(sp, M_ERR, "Search offset before line 1.");
return (1);
}
} else {
if (ULONG_MAX - lno < delta) {
msgq(sp, M_ERR, "Delta value overflow.");
return (1);
}
if (file_gline(sp, ep, lno + delta, NULL) == NULL) {
msgq(sp, M_ERR, "Search offset past end-of-file.");
return (1);
}
}
return (0);
}
/*
* re_error --
* Report a regular expression error.
*/
void
re_error(sp, errcode, preg)
SCR *sp;
int errcode;
regex_t *preg;
{
size_t s;
char *oe;
s = regerror(errcode, preg, "", 0);
if ((oe = malloc(s)) == NULL)
msgq(sp, M_SYSERR, NULL);
else {
(void)regerror(errcode, preg, oe, s);
msgq(sp, M_ERR, "RE error: %s", oe);
}
free(oe);
}
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