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HardenedBSD/usr.bin/vi/ex/ex_subst.c
Sean Eric Fagan 6d20d793f5 Bringing up to version 1.33. 
Reviewed by:	Sean Eric Fagan
1994-08-17 22:18:26 +00:00

1002 lines
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/*-
* Copyright (c) 1992, 1993, 1994
* 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
static const char sccsid[] = "@(#)ex_subst.c 8.58 (Berkeley) 8/17/94";
#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 <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
#define SUB_FIRST 0x01 /* The 'r' flag isn't reasonable. */
#define SUB_MUSTSETR 0x02 /* The 'r' flag is required. */
static __inline int regsub __P((SCR *, char *,
char **, size_t *, size_t *, regmatch_t [10]));
static int substitute __P((SCR *, EXF *,
EXCMDARG *, char *, regex_t *, u_int));
/*
* ex_substitute --
* [line [,line]] s[ubstitute] [[/;]pat[/;]/repl[/;] [cgr] [count] [#lp]]
*
* Substitute on lines matching a pattern.
*/
int
ex_substitute(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
regex_t *re, lre;
size_t blen, len;
u_int flags;
int delim, eval, reflags, replaced;
char *bp, *ptrn, *rep, *p, *t;
/*
* Skip leading white space.
*
* !!!
* Historic vi allowed any non-alphanumeric to serve as the
* substitution command delimiter.
*
* !!!
* If the arguments are empty, it's the same as &, i.e. we
* repeat the last substitution.
*/
for (p = cmdp->argv[0]->bp,
len = cmdp->argv[0]->len; len > 0; --len, ++p) {
if (!isblank(*p))
break;
}
if (len == 0)
return (ex_subagain(sp, ep, cmdp));
delim = *p++;
if (isalnum(delim))
return (substitute(sp, ep,
cmdp, p, &sp->subre, SUB_MUSTSETR));
/*
* !!!
* The full-blown substitute command reset the remembered
* state of the 'c' and 'g' suffices.
*/
sp->c_suffix = sp->g_suffix = 0;
/*
* Get the pattern string, toss escaped characters.
*
* !!!
* Historic vi accepted any of the following forms:
*
* :s/abc/def/ change "abc" to "def"
* :s/abc/def change "abc" to "def"
* :s/abc/ delete "abc"
* :s/abc delete "abc"
*
* QUOTING NOTE:
*
* Only toss an escape character if it escapes a delimiter.
* This means that "s/A/\\\\f" replaces "A" with "\\f". It
* would be nice to be more regular, i.e. for each layer of
* escaping a single escape character is removed, but that's
* not how the historic vi worked.
*/
for (ptrn = t = p;;) {
if (p[0] == '\0' || p[0] == delim) {
if (p[0] == delim)
++p;
/*
* !!!
* Nul terminate the pattern string -- it's passed
* to regcomp which doesn't understand anything else.
*/
*t = '\0';
break;
}
if (p[0] == '\\')
if (p[1] == delim)
++p;
else if (p[1] == '\\')
*t++ = *p++;
*t++ = *p++;
}
/*
* If the pattern string is empty, use the last RE (not just the
* last substitution RE).
*/
if (*ptrn == '\0') {
if (!F_ISSET(sp, S_SRE_SET)) {
msgq(sp, M_ERR, "No previous regular expression");
return (1);
}
re = &sp->sre;
flags = 0;
} else {
/* Set RE flags. */
reflags = 0;
if (O_ISSET(sp, O_EXTENDED))
reflags |= REG_EXTENDED;
if (O_ISSET(sp, O_IGNORECASE))
reflags |= REG_ICASE;
/* Convert vi-style RE's to POSIX 1003.2 RE's. */
if (re_conv(sp, &ptrn, &replaced))
return (1);
/* Compile the RE. */
eval = regcomp(&lre, (char *)ptrn, reflags);
/* Free up any allocated memory. */
if (replaced)
FREE_SPACE(sp, ptrn, 0);
if (eval) {
re_error(sp, eval, &lre);
return (1);
}
/*
* Set saved RE.
*
* !!!
* Historic practice is that substitutes set the search
* direction as well as both substitute and search RE's.
*/
sp->searchdir = FORWARD;
sp->sre = lre;
F_SET(sp, S_SRE_SET);
sp->subre = lre;
F_SET(sp, S_SUBRE_SET);
re = &lre;
flags = SUB_FIRST;
}
/*
* Get the replacement string.
*
* The special character & (\& if O_MAGIC not set) matches the
* entire RE. No handling of & is required here, it's done by
* regsub().
*
* The special character ~ (\~ if O_MAGIC not set) inserts the
* previous replacement string into this replacement string.
* Count ~'s to figure out how much space we need. We could
* special case nonexistent last patterns or whether or not
* O_MAGIC is set, but it's probably not worth the effort.
*
* QUOTING NOTE:
*
* Only toss an escape character if it escapes a delimiter or
* if O_MAGIC is set and it escapes a tilde.
*
* !!!
* If the entire replacement pattern is "%", then use the last
* replacement pattern. This semantic was added to vi in System
* V and then percolated elsewhere, presumably around the time
* that it was added to their version of ed(1).
*/
if (p[0] == '\0' || p[0] == delim) {
if (p[0] == delim)
++p;
if (sp->repl != NULL)
FREE(sp->repl, sp->repl_len);
sp->repl = NULL;
sp->repl_len = 0;
} else if (p[0] == '%' && (p[1] == '\0' || p[1] == delim))
p += p[1] == delim ? 2 : 1;
else {
for (rep = p, len = 0;
p[0] != '\0' && p[0] != delim; ++p, ++len)
if (p[0] == '~')
len += sp->repl_len;
GET_SPACE_RET(sp, bp, blen, len);
for (t = bp, len = 0, p = rep;;) {
if (p[0] == '\0' || p[0] == delim) {
if (p[0] == delim)
++p;
break;
}
if (p[0] == '\\') {
if (p[1] == delim)
++p;
else if (p[1] == '\\') {
*t++ = *p++;
++len;
} else if (p[1] == '~') {
++p;
if (!O_ISSET(sp, O_MAGIC))
goto tilde;
}
} else if (p[0] == '~' && O_ISSET(sp, O_MAGIC)) {
tilde: ++p;
memmove(t, sp->repl, sp->repl_len);
t += sp->repl_len;
len += sp->repl_len;
continue;
}
*t++ = *p++;
++len;
}
if ((sp->repl_len = len) != 0) {
if (sp->repl != NULL)
free(sp->repl);
if ((sp->repl = malloc(len)) == NULL) {
msgq(sp, M_SYSERR, NULL);
FREE_SPACE(sp, bp, blen);
return (1);
}
memmove(sp->repl, bp, len);
}
FREE_SPACE(sp, bp, blen);
}
return (substitute(sp, ep, cmdp, p, re, flags));
}
/*
* ex_subagain --
* [line [,line]] & [cgr] [count] [#lp]]
*
* Substitute using the last substitute RE and replacement pattern.
*/
int
ex_subagain(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
if (!F_ISSET(sp, S_SUBRE_SET)) {
msgq(sp, M_ERR, "No previous regular expression");
return (1);
}
return (substitute(sp, ep, cmdp, cmdp->argv[0]->bp, &sp->subre, 0));
}
/*
* ex_subtilde --
* [line [,line]] ~ [cgr] [count] [#lp]]
*
* Substitute using the last RE and last substitute replacement pattern.
*/
int
ex_subtilde(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
if (!F_ISSET(sp, S_SRE_SET)) {
msgq(sp, M_ERR, "No previous regular expression");
return (1);
}
return (substitute(sp, ep, cmdp, cmdp->argv[0]->bp, &sp->sre, 0));
}
/*
* The nasty part of the substitution is what happens when the replacement
* string contains newlines. It's a bit tricky -- consider the information
* that has to be retained for "s/f\(o\)o/^M\1^M\1/". The solution here is
* to build a set of newline offsets which we use to break the line up later,
* when the replacement is done. Don't change it unless you're pretty damned
* confident.
*/
#define NEEDNEWLINE(sp) { \
if (sp->newl_len == sp->newl_cnt) { \
sp->newl_len += 25; \
REALLOC(sp, sp->newl, size_t *, \
sp->newl_len * sizeof(size_t)); \
if (sp->newl == NULL) { \
sp->newl_len = 0; \
return (1); \
} \
} \
}
#define BUILD(sp, l, len) { \
if (lbclen + (len) > lblen) { \
lblen += MAX(lbclen + (len), 256); \
REALLOC(sp, lb, char *, lblen); \
if (lb == NULL) { \
lbclen = 0; \
return (1); \
} \
} \
memmove(lb + lbclen, l, len); \
lbclen += len; \
}
#define NEEDSP(sp, len, pnt) { \
if (lbclen + (len) > lblen) { \
lblen += MAX(lbclen + (len), 256); \
REALLOC(sp, lb, char *, lblen); \
if (lb == NULL) { \
lbclen = 0; \
return (1); \
} \
pnt = lb + lbclen; \
} \
}
/*
* substitute --
* Do the substitution. This stuff is *really* tricky. There are
* lots of special cases, and general nastiness. Don't mess with it
* unless you're pretty confident.
*/
static int
substitute(sp, ep, cmdp, s, re, flags)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
char *s;
regex_t *re;
u_int flags;
{
MARK from, to;
recno_t elno, lno;
regmatch_t match[10];
size_t blen, cnt, last, lbclen, lblen, len, llen, offset, saved_offset;
int cflag, lflag, nflag, pflag, rflag;
int didsub, do_eol_match, eflags, empty_ok, eval;
int linechanged, matched, quit, rval;
char *bp, *lb;
/*
* !!!
* Historically, the 'g' and 'c' suffices were always toggled as flags,
* so ":s/A/B/" was the same as ":s/A/B/ccgg". If O_EDCOMPATIBLE was
* not set, they were initialized to 0 for all substitute commands. If
* O_EDCOMPATIBLE was set, they were initialized to 0 only if the user
* specified substitute/replacement patterns (see ex_substitute()).
*/
if (!O_ISSET(sp, O_EDCOMPATIBLE))
sp->c_suffix = sp->g_suffix = 0;
/*
* Historic vi permitted the '#', 'l' and 'p' options in vi mode, but
* it only displayed the last change. I'd disallow them, but they are
* useful in combination with the [v]global commands. In the current
* model the problem is combining them with the 'c' flag -- the screen
* would have to flip back and forth between the confirm screen and the
* ex print screen, which would be pretty awful. We do display all
* changes, though, for what that's worth.
*
* !!!
* Historic vi was fairly strict about the order of "options", the
* count, and "flags". I'm somewhat fuzzy on the difference between
* options and flags, anyway, so this is a simpler approach, and we
* just take it them in whatever order the user gives them. (The ex
* usage statement doesn't reflect this.)
*/
cflag = lflag = nflag = pflag = rflag = 0;
for (lno = OOBLNO; *s != '\0'; ++s)
switch (*s) {
case ' ':
case '\t':
continue;
case '+':
++cmdp->flagoff;
break;
case '-':
--cmdp->flagoff;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (lno != OOBLNO)
goto usage;
errno = 0;
lno = strtoul(s, &s, 10);
if (*s == '\0') /* Loop increment correction. */
--s;
if (errno == ERANGE) {
if (lno == LONG_MAX)
msgq(sp, M_ERR, "Count overflow");
else if (lno == LONG_MIN)
msgq(sp, M_ERR, "Count underflow");
else
msgq(sp, M_SYSERR, NULL);
return (1);
}
/*
* In historic vi, the count was inclusive from the
* second address.
*/
cmdp->addr1.lno = cmdp->addr2.lno;
cmdp->addr2.lno += lno - 1;
break;
case '#':
nflag = 1;
break;
case 'c':
sp->c_suffix = !sp->c_suffix;
break;
case 'g':
sp->g_suffix = !sp->g_suffix;
break;
case 'l':
lflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
if (LF_ISSET(SUB_FIRST)) {
msgq(sp, M_ERR,
"Regular expression specified; r flag meaningless");
return (1);
}
if (!F_ISSET(sp, S_SRE_SET)) {
msgq(sp, M_ERR,
"No previous regular expression");
return (1);
}
rflag = 1;
re = &sp->sre;
break;
default:
goto usage;
}
if (*s != '\0' || !rflag && LF_ISSET(SUB_MUSTSETR)) {
usage: msgq(sp, M_ERR, "Usage: %s", cmdp->cmd->usage);
return (1);
}
if (IN_VI_MODE(sp) && sp->c_suffix && (lflag || nflag || pflag)) {
msgq(sp, M_ERR,
"The #, l and p flags may not be combined with the c flag in vi mode");
return (1);
}
/*
* bp: if interactive, line cache
* blen: if interactive, line cache length
* lb: build buffer pointer.
* lbclen: current length of built buffer.
* lblen; length of build buffer.
*/
bp = lb = NULL;
blen = lbclen = lblen = 0;
/* For each line... */
for (matched = quit = 0, lno = cmdp->addr1.lno,
elno = cmdp->addr2.lno; !quit && lno <= elno; ++lno) {
/* Someone's unhappy, time to stop. */
if (INTERRUPTED(sp)) {
if (!F_ISSET(sp, S_GLOBAL))
msgq(sp, M_INFO, "Interrupted");
break;
}
/* Get the line. */
if ((s = file_gline(sp, ep, lno, &llen)) == NULL) {
GETLINE_ERR(sp, lno);
goto ret1;
}
/*
* Make a local copy if doing confirmation -- when calling
* the confirm routine we're likely to lose the cached copy.
*/
if (sp->c_suffix) {
if (bp == NULL) {
GET_SPACE_RET(sp, bp, blen, llen);
} else
ADD_SPACE_RET(sp, bp, blen, llen);
memmove(bp, s, llen);
s = bp;
}
/* Start searching from the beginning. */
offset = 0;
len = llen;
/* Reset the build buffer offset. */
lbclen = 0;
/* Reset empty match flag. */
empty_ok = 1;
/*
* We don't want to have to do a setline if the line didn't
* change -- keep track of whether or not this line changed.
* If doing confirmations, don't want to keep setting the
* line if change is refused -- keep track of substitutions.
*/
didsub = linechanged = 0;
/* New line, do an EOL match. */
do_eol_match = 1;
/* It's not nul terminated, but we pretend it is. */
eflags = REG_STARTEND;
/*
* The search area is from s + offset to the EOL.
*
* Generally, match[0].rm_so is the offset of the start
* of the match from the start of the search, and offset
* is the offset of the start of the last search.
*/
nextmatch: match[0].rm_so = 0;
match[0].rm_eo = len;
/* Get the next match. */
eval = regexec(re, (char *)s + offset, 10, match, eflags);
/*
* There wasn't a match or if there was an error, deal with
* it. If there was a previous match in this line, resolve
* the changes into the database. Otherwise, just move on.
*/
if (eval == REG_NOMATCH)
goto endmatch;
if (eval != 0) {
re_error(sp, eval, re);
goto ret1;
}
matched = 1;
/* Only the first search can match an anchored expression. */
eflags |= REG_NOTBOL;
/*
* !!!
* It's possible to match 0-length strings -- for example, the
* command s;a*;X;, when matched against the string "aabb" will
* result in "XbXbX", i.e. the matches are "aa", the space
* between the b's and the space between the b's and the end of
* the string. There is a similar space between the beginning
* of the string and the a's. The rule that we use (because vi
* historically used it) is that any 0-length match, occurring
* immediately after a match, is ignored. Otherwise, the above
* example would have resulted in "XXbXbX". Another example is
* incorrectly using " *" to replace groups of spaces with one
* space.
*
* The way we do this is that if we just had a successful match,
* the starting offset does not skip characters, and the match
* is empty, ignore the match and move forward. If there's no
* more characters in the string, we were attempting to match
* after the last character, so quit.
*/
if (!empty_ok && match[0].rm_so == 0 && match[0].rm_eo == 0) {
empty_ok = 1;
if (len == 0)
goto endmatch;
BUILD(sp, s + offset, 1)
++offset;
--len;
goto nextmatch;
}
/* Confirm change. */
if (sp->c_suffix) {
/*
* Set the cursor position for confirmation. Note,
* if we matched on a '$', the cursor may be past
* the end of line.
*
* XXX
* We may want to "fix" this in the confirm routine,
* if the confirm routine should be able to display
* a cursor past EOL.
*/
from.lno = to.lno = lno;
from.cno = match[0].rm_so + offset;
to.cno = match[0].rm_eo;
if (llen == 0)
from.cno = to.cno = 0;
else {
if (to.cno >= llen)
to.cno = llen - 1;
if (from.cno >= llen)
from.cno = llen - 1;
}
switch (sp->s_confirm(sp, ep, &from, &to)) {
case CONF_YES:
break;
case CONF_NO:
didsub = 0;
BUILD(sp, s +offset, match[0].rm_eo);
goto skip;
case CONF_QUIT:
/* Set the quit flag. */
quit = 1;
/* If interruptible, pass the info back. */
if (F_ISSET(sp, S_INTERRUPTIBLE))
F_SET(sp, S_INTERRUPTED);
/*
* If any changes, resolve them, otherwise
* return to the main loop.
*/
goto endmatch;
}
}
/* Copy the bytes before the match into the build buffer. */
BUILD(sp, s + offset, match[0].rm_so);
/* Substitute the matching bytes. */
didsub = 1;
if (regsub(sp, s + offset, &lb, &lbclen, &lblen, match))
goto ret1;
/* Set the change flag so we know this line was modified. */
linechanged = 1;
/* Move past the matched bytes. */
skip: offset += match[0].rm_eo;
len -= match[0].rm_eo;
/* A match cannot be followed by an empty pattern. */
empty_ok = 0;
/*
* If doing a global change with confirmation, we have to
* update the screen. The basic idea is to store the line
* so the screen update routines can find it, and restart.
*/
if (didsub && sp->c_suffix && sp->g_suffix) {
/*
* The new search offset will be the end of the
* modified line.
*/
saved_offset = lbclen;
/* Copy the rest of the line. */
if (len)
BUILD(sp, s + offset, len)
/* Set the new offset. */
offset = saved_offset;
/* Store inserted lines, adjusting the build buffer. */
last = 0;
if (sp->newl_cnt) {
for (cnt = 0;
cnt < sp->newl_cnt; ++cnt, ++lno, ++elno) {
if (file_iline(sp, ep, lno,
lb + last, sp->newl[cnt] - last))
goto ret1;
last = sp->newl[cnt] + 1;
++sp->rptlines[L_ADDED];
}
lbclen -= last;
offset -= last;
sp->newl_cnt = 0;
}
/* Store and retrieve the line. */
if (file_sline(sp, ep, lno, lb + last, lbclen))
goto ret1;
if ((s = file_gline(sp, ep, lno, &llen)) == NULL) {
GETLINE_ERR(sp, lno);
goto ret1;
}
ADD_SPACE_RET(sp, bp, blen, llen)
memmove(bp, s, llen);
s = bp;
len = llen - offset;
/* Restart the build. */
lbclen = 0;
BUILD(sp, s, offset);
/*
* If we haven't already done the after-the-string
* match, do one. Set REG_NOTEOL so the '$' pattern
* only matches once.
*/
if (!do_eol_match)
goto endmatch;
if (offset == len) {
do_eol_match = 0;
eflags |= REG_NOTEOL;
}
goto nextmatch;
}
/*
* If it's a global:
*
* If at the end of the string, do a test for the after
* the string match. Set REG_NOTEOL so the '$' pattern
* only matches once.
*/
if (sp->g_suffix && do_eol_match) {
if (len == 0) {
do_eol_match = 0;
eflags |= REG_NOTEOL;
}
goto nextmatch;
}
endmatch: if (!linechanged)
continue;
/* Copy any remaining bytes into the build buffer. */
if (len)
BUILD(sp, s + offset, len)
/* Store inserted lines, adjusting the build buffer. */
last = 0;
if (sp->newl_cnt) {
for (cnt = 0;
cnt < sp->newl_cnt; ++cnt, ++lno, ++elno) {
if (file_iline(sp, ep,
lno, lb + last, sp->newl[cnt] - last))
goto ret1;
last = sp->newl[cnt] + 1;
++sp->rptlines[L_ADDED];
}
lbclen -= last;
sp->newl_cnt = 0;
}
/* Store the changed line. */
if (file_sline(sp, ep, lno, lb + last, lbclen))
goto ret1;
/* Update changed line counter. */
if (sp->rptlchange != lno) {
sp->rptlchange = lno;
++sp->rptlines[L_CHANGED];
}
/*
* !!!
* Display as necessary. Historic practice is to only
* display the last line of a line split into multiple
* lines.
*/
if (lflag || nflag || pflag) {
from.lno = to.lno = lno;
from.cno = to.cno = 0;
if (lflag)
ex_print(sp, ep, &from, &to, E_F_LIST);
if (nflag)
ex_print(sp, ep, &from, &to, E_F_HASH);
if (pflag)
ex_print(sp, ep, &from, &to, E_F_PRINT);
}
if (!sp->c_suffix)
sp->lno = lno;
/*
* !!!
* Move the cursor to the last line changed.
*/
if (!sp->c_suffix)
sp->lno = lno;
}
/*
* !!!
* Move the cursor to the first non-blank of the last line change.
*
* XXX
* This is NOT backward compatible with historic vi, which always
* moved to the last line actually changed.
*/
if (!sp->c_suffix) {
sp->cno = 0;
(void)nonblank(sp, ep, sp->lno, &sp->cno);
}
/*
* If not in a global command, and nothing matched, say so.
* Else, if none of the lines displayed, put something up.
*/
if (!matched) {
if (!F_ISSET(sp, S_GLOBAL))
msgq(sp, M_INFO, "No match found");
} else if (!lflag && !nflag && !pflag)
F_SET(EXP(sp), EX_AUTOPRINT);
rval = 0;
if (0) {
ret1: rval = 1;
}
if (bp != NULL)
FREE_SPACE(sp, bp, blen);
if (lb != NULL)
free(lb);
return (rval);
}
/*
* regsub --
* Do the substitution for a regular expression.
*/
static __inline int
regsub(sp, ip, lbp, lbclenp, lblenp, match)
SCR *sp;
char *ip; /* Input line. */
char **lbp;
size_t *lbclenp, *lblenp;
regmatch_t match[10];
{
enum { C_NOTSET, C_LOWER, C_ONELOWER, C_ONEUPPER, C_UPPER } conv;
size_t lbclen, lblen; /* Local copies. */
size_t mlen; /* Match length. */
size_t rpl; /* Remaining replacement length. */
char *rp; /* Replacement pointer. */
int ch;
int no; /* Match replacement offset. */
char *p, *t; /* Buffer pointers. */
char *lb; /* Local copies. */
lb = *lbp; /* Get local copies. */
lbclen = *lbclenp;
lblen = *lblenp;
/*
* QUOTING NOTE:
*
* There are some special sequences that vi provides in the
* replacement patterns.
* & string the RE matched (\& if nomagic set)
* \# n-th regular subexpression
* \E end \U, \L conversion
* \e end \U, \L conversion
* \l convert the next character to lower-case
* \L convert to lower-case, until \E, \e, or end of replacement
* \u convert the next character to upper-case
* \U convert to upper-case, until \E, \e, or end of replacement
*
* Otherwise, since this is the lowest level of replacement, discard
* all escape characters. This (hopefully) follows historic practice.
*/
#define ADDCH(ch) { \
CHAR_T __ch = (ch); \
u_int __value = KEY_VAL(sp, __ch); \
if (__value == K_CR || __value == K_NL) { \
NEEDNEWLINE(sp); \
sp->newl[sp->newl_cnt++] = lbclen; \
} else if (conv != C_NOTSET) { \
switch (conv) { \
case C_ONELOWER: \
conv = C_NOTSET; \
/* FALLTHROUGH */ \
case C_LOWER: \
if (isupper(__ch)) \
__ch = tolower(__ch); \
break; \
case C_ONEUPPER: \
conv = C_NOTSET; \
/* FALLTHROUGH */ \
case C_UPPER: \
if (islower(__ch)) \
__ch = toupper(__ch); \
break; \
default: \
abort(); \
} \
} \
NEEDSP(sp, 1, p); \
*p++ = __ch; \
++lbclen; \
}
conv = C_NOTSET;
for (rp = sp->repl, rpl = sp->repl_len, p = lb + lbclen; rpl--;) {
switch (ch = *rp++) {
case '&':
if (O_ISSET(sp, O_MAGIC)) {
no = 0;
goto subzero;
}
break;
case '\\':
if (rpl == 0)
break;
--rpl;
switch (ch = *rp) {
case '&':
++rp;
if (!O_ISSET(sp, O_MAGIC)) {
no = 0;
goto subzero;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
no = *rp++ - '0';
subzero: if (match[no].rm_so == -1 ||
match[no].rm_eo == -1)
break;
mlen = match[no].rm_eo - match[no].rm_so;
for (t = ip + match[no].rm_so; mlen--; ++t)
ADDCH(*t);
continue;
case 'e':
case 'E':
++rp;
conv = C_NOTSET;
continue;
case 'l':
++rp;
conv = C_ONELOWER;
continue;
case 'L':
++rp;
conv = C_LOWER;
continue;
case 'u':
++rp;
conv = C_ONEUPPER;
continue;
case 'U':
++rp;
conv = C_UPPER;
continue;
default:
++rp;
break;
}
}
ADDCH(ch);
}
*lbp = lb; /* Update caller's information. */
*lbclenp = lbclen;
*lblenp = lblen;
return (0);
}
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