/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1992 Diomidis Spinellis.
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Diomidis Spinellis of Imperial College, University of London.
*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
static const char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94";
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "defs.h"
#include "extern.h"
static SPACE HS, PS, SS, YS;
#define pd PS.deleted
#define ps PS.space
#define psl PS.len
#define psanl PS.append_newline
#define hs HS.space
#define hsl HS.len
static inline int applies(struct s_command *);
static void do_tr(struct s_tr *);
static void flush_appends(void);
static void lputs(char *, size_t);
static int regexec_e(regex_t *, const char *, int, int, size_t,
size_t);
static void regsub(SPACE *, char *, char *);
static int substitute(struct s_command *);
struct s_appends *appends; /* Array of pointers to strings to append. */
static unsigned int appendx; /* Index into appends array. */
unsigned int appendnum; /* Size of appends array. */
static int lastaddr; /* Set by applies if last address of a range. */
static int sdone; /* If any substitutes since last line input. */
/* Iov structure for 'w' commands. */
static regex_t *defpreg;
size_t maxnsub;
regmatch_t *match;
#define OUT() do { \
fwrite(ps, 1, psl, outfile); \
if (psanl) fputc('\n', outfile); \
} while (0)
void
process(void)
{
struct s_command *cp;
SPACE tspace;
size_t oldpsl;
char *p;
int oldpsanl;
p = NULL;
oldpsanl = oldpsl = 0;
for (linenum = 0; mf_fgets(&PS, REPLACE);) {
pd = 0;
top:
cp = prog;
redirect:
while (cp != NULL) {
if (!applies(cp)) {
cp = cp->next;
continue;
}
switch (cp->code) {
case '{':
cp = cp->u.c;
goto redirect;
case 'a':
if (appendx >= appendnum)
if ((appends = realloc(appends,
sizeof(struct s_appends) *
(appendnum *= 2))) == NULL)
err(1, "realloc");
appends[appendx].type = AP_STRING;
appends[appendx].s = cp->t;
appends[appendx].len = strlen(cp->t);
appendx++;
break;
case 'b':
cp = cp->u.c;
goto redirect;
case 'c':
pd = 1;
psl = 0;
if (cp->a2 == NULL || lastaddr || lastline())
(void)fprintf(outfile, "%s", cp->t);
break;
case 'd':
pd = 1;
goto new;
case 'D':
if (pd)
goto new;
if (psl == 0 ||
(p = memchr(ps, '\n', psl)) == NULL) {
pd = 1;
goto new;
} else {
psl -= (p + 1) - ps;
memmove(ps, p + 1, psl);
goto top;
}
case 'g':
cspace(&PS, hs, hsl, REPLACE);
break;
case 'G':
cspace(&PS, "\n", 1, APPEND);
cspace(&PS, hs, hsl, APPEND);
break;
case 'h':
cspace(&HS, ps, psl, REPLACE);
break;
case 'H':
cspace(&HS, "\n", 1, APPEND);
cspace(&HS, ps, psl, APPEND);
break;
case 'i':
(void)fprintf(outfile, "%s", cp->t);
break;
case 'l':
lputs(ps, psl);
break;
case 'n':
if (!nflag && !pd)
OUT();
flush_appends();
if (!mf_fgets(&PS, REPLACE))
exit(0);
pd = 0;
break;
case 'N':
flush_appends();
cspace(&PS, "\n", 1, APPEND);
if (!mf_fgets(&PS, APPEND))
exit(0);
break;
case 'p':
if (pd)
break;
OUT();
break;
case 'P':
if (pd)
break;
if ((p = memchr(ps, '\n', psl)) != NULL) {
oldpsl = psl;
oldpsanl = psanl;
psl = p - ps;
psanl = 1;
}
OUT();
if (p != NULL) {
psl = oldpsl;
psanl = oldpsanl;
}
break;
case 'q':
if (inplace == NULL) {
if (!nflag && !pd)
OUT();
flush_appends();
exit(0);
}
quit = 1;
break;
case 'r':
if (appendx >= appendnum)
if ((appends = realloc(appends,
sizeof(struct s_appends) *
(appendnum *= 2))) == NULL)
err(1, "realloc");
appends[appendx].type = AP_FILE;
appends[appendx].s = cp->t;
appends[appendx].len = strlen(cp->t);
appendx++;
break;
case 's':
sdone |= substitute(cp);
break;
case 't':
if (sdone) {
sdone = 0;
cp = cp->u.c;
goto redirect;
}
break;
case 'w':
if (pd)
break;
if (cp->u.fd == -1 && (cp->u.fd = open(cp->t,
O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
DEFFILEMODE)) == -1)
err(1, "%s", cp->t);
if (write(cp->u.fd, ps, psl) != (ssize_t)psl ||
write(cp->u.fd, "\n", 1) != 1)
err(1, "%s", cp->t);
break;
case 'x':
/*
* If the hold space is null, make it empty
* but not null. Otherwise the pattern space
* will become null after the swap, which is
* an abnormal condition.
*/
if (hs == NULL)
cspace(&HS, "", 0, REPLACE);
tspace = PS;
PS = HS;
psanl = tspace.append_newline;
HS = tspace;
break;
case 'y':
if (pd || psl == 0)
break;
do_tr(cp->u.y);
break;
case ':':
case '}':
break;
case '=':
(void)fprintf(outfile, "%lu\n", linenum);
}
cp = cp->next;
} /* for all cp */
new: if (!nflag && !pd)
OUT();
flush_appends();
} /* for all lines */
}
/*
* TRUE if the address passed matches the current program state
* (lastline, linenumber, ps).
*/
#define MATCH(a) \
((a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, 0, psl) : \
(a)->type == AT_LINE ? linenum == (a)->u.l : lastline())
/*
* Return TRUE if the command applies to the current line. Sets the start
* line for process ranges. Interprets the non-select (``!'') flag.
*/
static inline int
applies(struct s_command *cp)
{
int r;
lastaddr = 0;
if (cp->a1 == NULL && cp->a2 == NULL)
r = 1;
else if (cp->a2)
if (cp->startline > 0) {
switch (cp->a2->type) {
case AT_RELLINE:
if (linenum - cp->startline <= cp->a2->u.l)
r = 1;
else {
cp->startline = 0;
r = 0;
}
break;
default:
if (MATCH(cp->a2)) {
cp->startline = 0;
lastaddr = 1;
r = 1;
} else if (cp->a2->type == AT_LINE &&
linenum > cp->a2->u.l) {
/*
* We missed the 2nd address due to a
* branch, so just close the range and
* return false.
*/
cp->startline = 0;
r = 0;
} else
r = 1;
}
} else if (cp->a1 && MATCH(cp->a1)) {
/*
* If the second address is a number less than or
* equal to the line number first selected, only
* one line shall be selected.
* -- POSIX 1003.2
* Likewise if the relative second line address is zero.
*/
if ((cp->a2->type == AT_LINE &&
linenum >= cp->a2->u.l) ||
(cp->a2->type == AT_RELLINE && cp->a2->u.l == 0))
lastaddr = 1;
else {
cp->startline = linenum;
}
r = 1;
} else
r = 0;
else
r = MATCH(cp->a1);
return (cp->nonsel ? ! r : r);
}
/*
* Reset the sed processor to its initial state.
*/
void
resetstate(void)
{
struct s_command *cp;
/*
* Reset all in-range markers.
*/
for (cp = prog; cp; cp = cp->code == '{' ? cp->u.c : cp->next)
if (cp->a2)
cp->startline = 0;
/*
* Clear out the hold space.
*/
cspace(&HS, "", 0, REPLACE);
}
/*
* substitute --
* Do substitutions in the pattern space. Currently, we build a
* copy of the new pattern space in the substitute space structure
* and then swap them.
*/
static int
substitute(struct s_command *cp)
{
SPACE tspace;
regex_t *re;
regoff_t slen;
int lastempty, n;
regoff_t le = 0;
char *s;
s = ps;
re = cp->u.s->re;
if (re == NULL) {
if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) {
linenum = cp->u.s->linenum;
errx(1, "%lu: %s: \\%u not defined in the RE",
linenum, fname, cp->u.s->maxbref);
}
}
if (!regexec_e(re, ps, 0, 0, 0, psl))
return (0);
SS.len = 0; /* Clean substitute space. */
slen = psl;
n = cp->u.s->n;
lastempty = 1;
do {
/* Copy the leading retained string. */
if (n <= 1 && (match[0].rm_so > le))
cspace(&SS, s, match[0].rm_so - le, APPEND);
/* Skip zero-length matches right after other matches. */
if (lastempty || (match[0].rm_so - le) ||
match[0].rm_so != match[0].rm_eo) {
if (n <= 1) {
/* Want this match: append replacement. */
regsub(&SS, ps, cp->u.s->new);
if (n == 1)
n = -1;
} else {
/* Want a later match: append original. */
if (match[0].rm_eo - le)
cspace(&SS, s, match[0].rm_eo - le,
APPEND);
n--;
}
}
/* Move past this match. */
s = ps + match[0].rm_eo;
slen = psl - match[0].rm_eo;
le = match[0].rm_eo;
/*
* After a zero-length match, advance one byte,
* and at the end of the line, terminate.
*/
if (match[0].rm_so == match[0].rm_eo) {
if (*s == '\0' || *s == '\n')
slen = -1;
else
slen--;
if (*s != '\0') {
cspace(&SS, s++, 1, APPEND);
le++;
}
lastempty = 1;
} else
lastempty = 0;
} while (n >= 0 && slen >= 0 &&
regexec_e(re, ps, REG_NOTBOL, 0, le, psl));
/* Did not find the requested number of matches. */
if (n > 0)
return (0);
/* Copy the trailing retained string. */
if (slen > 0)
cspace(&SS, s, slen, APPEND);
/*
* Swap the substitute space and the pattern space, and make sure
* that any leftover pointers into stdio memory get lost.
*/
tspace = PS;
PS = SS;
psanl = tspace.append_newline;
SS = tspace;
SS.space = SS.back;
/* Handle the 'p' flag. */
if (cp->u.s->p)
OUT();
/* Handle the 'w' flag. */
if (cp->u.s->wfile && !pd) {
if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile,
O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1)
err(1, "%s", cp->u.s->wfile);
if (write(cp->u.s->wfd, ps, psl) != (ssize_t)psl ||
write(cp->u.s->wfd, "\n", 1) != 1)
err(1, "%s", cp->u.s->wfile);
}
return (1);
}
/*
* do_tr --
* Perform translation ('y' command) in the pattern space.
*/
static void
do_tr(struct s_tr *y)
{
SPACE tmp;
char c, *p;
size_t clen, left;
int i;
if (MB_CUR_MAX == 1) {
/*
* Single-byte encoding: perform in-place translation
* of the pattern space.
*/
for (p = ps; p < &ps[psl]; p++)
*p = y->bytetab[(u_char)*p];
} else {
/*
* Multi-byte encoding: perform translation into the
* translation space, then swap the translation and
* pattern spaces.
*/
/* Clean translation space. */
YS.len = 0;
for (p = ps, left = psl; left > 0; p += clen, left -= clen) {
if ((c = y->bytetab[(u_char)*p]) != '\0') {
cspace(&YS, &c, 1, APPEND);
clen = 1;
continue;
}
for (i = 0; i < y->nmultis; i++)
if (left >= y->multis[i].fromlen &&
memcmp(p, y->multis[i].from,
y->multis[i].fromlen) == 0)
break;
if (i < y->nmultis) {
cspace(&YS, y->multis[i].to,
y->multis[i].tolen, APPEND);
clen = y->multis[i].fromlen;
} else {
cspace(&YS, p, 1, APPEND);
clen = 1;
}
}
/* Swap the translation space and the pattern space. */
tmp = PS;
PS = YS;
psanl = tmp.append_newline;
YS = tmp;
YS.space = YS.back;
}
}
/*
* Flush append requests. Always called before reading a line,
* therefore it also resets the substitution done (sdone) flag.
*/
static void
flush_appends(void)
{
FILE *f;
unsigned int count, idx;
char buf[8 * 1024];
for (idx = 0; idx < appendx; idx++)
switch (appends[idx].type) {
case AP_STRING:
fwrite(appends[idx].s, sizeof(char), appends[idx].len,
outfile);
break;
case AP_FILE:
/*
* Read files probably shouldn't be cached. Since
* it's not an error to read a non-existent file,
* it's possible that another program is interacting
* with the sed script through the filesystem. It
* would be truly bizarre, but possible. It's probably
* not that big a performance win, anyhow.
*/
if ((f = fopen(appends[idx].s, "r")) == NULL)
break;
while ((count = fread(buf, sizeof(char), sizeof(buf), f)))
(void)fwrite(buf, sizeof(char), count, outfile);
(void)fclose(f);
break;
}
if (ferror(outfile))
errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
appendx = sdone = 0;
}
static void
lputs(char *s, size_t len)
{
static const char escapes[] = "\\\a\b\f\r\t\v";
int c, col, width;
const char *p;
struct winsize win;
static int termwidth = -1;
size_t clen, i;
wchar_t wc;
mbstate_t mbs;
if (outfile != stdout)
termwidth = 60;
if (termwidth == -1) {
if ((p = getenv("COLUMNS")) && *p != '\0')
termwidth = atoi(p);
else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
win.ws_col > 0)
termwidth = win.ws_col;
else
termwidth = 60;
}
if (termwidth <= 0)
termwidth = 1;
memset(&mbs, 0, sizeof(mbs));
col = 0;
while (len != 0) {
clen = mbrtowc(&wc, s, len, &mbs);
if (clen == 0)
clen = 1;
if (clen == (size_t)-1 || clen == (size_t)-2) {
wc = (unsigned char)*s;
clen = 1;
memset(&mbs, 0, sizeof(mbs));
}
if (wc == '\n') {
if (col + 1 >= termwidth)
fprintf(outfile, "\\\n");
fputc('$', outfile);
fputc('\n', outfile);
col = 0;
} else if (iswprint(wc)) {
width = wcwidth(wc);
if (col + width >= termwidth) {
fprintf(outfile, "\\\n");
col = 0;
}
fwrite(s, 1, clen, outfile);
col += width;
} else if (wc != L'\0' && (c = wctob(wc)) != EOF &&
(p = strchr(escapes, c)) != NULL) {
if (col + 2 >= termwidth) {
fprintf(outfile, "\\\n");
col = 0;
}
fprintf(outfile, "\\%c", "\\abfrtv"[p - escapes]);
col += 2;
} else {
if (col + 4 * clen >= (unsigned)termwidth) {
fprintf(outfile, "\\\n");
col = 0;
}
for (i = 0; i < clen; i++)
fprintf(outfile, "\\%03o",
(int)(unsigned char)s[i]);
col += 4 * clen;
}
s += clen;
len -= clen;
}
if (col + 1 >= termwidth)
fprintf(outfile, "\\\n");
(void)fputc('$', outfile);
(void)fputc('\n', outfile);
if (ferror(outfile))
errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
}
static int
regexec_e(regex_t *preg, const char *string, int eflags, int nomatch,
size_t start, size_t stop)
{
int eval;
if (preg == NULL) {
if (defpreg == NULL)
errx(1, "first RE may not be empty");
} else
defpreg = preg;
/* Set anchors */
match[0].rm_so = start;
match[0].rm_eo = stop;
eval = regexec(defpreg, string,
nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND);
switch(eval) {
case 0:
return (1);
case REG_NOMATCH:
return (0);
}
errx(1, "RE error: %s", strregerror(eval, defpreg));
/* NOTREACHED */
}
/*
* regsub - perform substitutions after a regexp match
* Based on a routine by Henry Spencer
*/
static void
regsub(SPACE *sp, char *string, char *src)
{
int len, no;
char c, *dst;
#define NEEDSP(reqlen) \
/* XXX What is the +1 for? */ \
if (sp->len + (reqlen) + 1 >= sp->blen) { \
sp->blen += (reqlen) + 1024; \
if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \
== NULL) \
err(1, "realloc"); \
dst = sp->space + sp->len; \
}
dst = sp->space + sp->len;
while ((c = *src++) != '\0') {
if (c == '&')
no = 0;
else if (c == '\\' && isdigit((unsigned char)*src))
no = *src++ - '0';
else
no = -1;
if (no < 0) { /* Ordinary character. */
if (c == '\\' && (*src == '\\' || *src == '&'))
c = *src++;
NEEDSP(1);
*dst++ = c;
++sp->len;
} else if (match[no].rm_so != -1 && match[no].rm_eo != -1) {
len = match[no].rm_eo - match[no].rm_so;
NEEDSP(len);
memmove(dst, string + match[no].rm_so, len);
dst += len;
sp->len += len;
}
}
NEEDSP(1);
*dst = '\0';
}
/*
* cspace --
* Concatenate space: append the source space to the destination space,
* allocating new space as necessary.
*/
void
cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag)
{
size_t tlen;
/* Make sure SPACE has enough memory and ramp up quickly. */
tlen = sp->len + len + 1;
if (tlen > sp->blen) {
sp->blen = tlen + 1024;
if ((sp->space = sp->back = realloc(sp->back, sp->blen)) ==
NULL)
err(1, "realloc");
}
if (spflag == REPLACE)
sp->len = 0;
memmove(sp->space + sp->len, p, len);
sp->space[sp->len += len] = '\0';
}
/*
* Close all cached opened files and report any errors
*/
void
cfclose(struct s_command *cp, struct s_command *end)
{
for (; cp != end; cp = cp->next)
switch(cp->code) {
case 's':
if (cp->u.s->wfd != -1 && close(cp->u.s->wfd))
err(1, "%s", cp->u.s->wfile);
cp->u.s->wfd = -1;
break;
case 'w':
if (cp->u.fd != -1 && close(cp->u.fd))
err(1, "%s", cp->t);
cp->u.fd = -1;
break;
case '{':
cfclose(cp->u.c, cp->next);
break;
}
}
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