freebsd-skq/usr.bin/grep/util.c

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/* $NetBSD: util.c,v 1.9 2011/02/27 17:33:37 joerg Exp $ */
/* $FreeBSD$ */
/* $OpenBSD: util.c,v 1.39 2010/07/02 22:18:03 tedu Exp $ */
/*-
2010-08-19 09:28:59 +00:00
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
* Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org>
* Copyright (C) 2017 Kyle Evans <kevans@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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>
__FBSDID("$FreeBSD$");
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fnmatch.h>
#include <fts.h>
#include <libgen.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#ifndef WITHOUT_FASTMATCH
#include "fastmatch.h"
#endif
#include "grep.h"
static bool first_match = true;
/*
* Parsing context; used to hold things like matches made and
* other useful bits
*/
struct parsec {
regmatch_t matches[MAX_MATCHES]; /* Matches made */
struct str ln; /* Current line */
size_t lnstart; /* Position in line */
size_t matchidx; /* Latest match index */
int printed; /* Metadata printed? */
bool binary; /* Binary file? */
};
#ifdef WITH_INTERNAL_NOSPEC
static int litexec(const struct pat *pat, const char *string,
size_t nmatch, regmatch_t pmatch[]);
#endif
static int procline(struct parsec *pc);
static void printline(struct parsec *pc, int sep);
static void printline_metadata(struct str *line, int sep);
bool
file_matching(const char *fname)
{
char *fname_base, *fname_buf;
bool ret;
ret = finclude ? false : true;
fname_buf = strdup(fname);
if (fname_buf == NULL)
err(2, "strdup");
fname_base = basename(fname_buf);
for (unsigned int i = 0; i < fpatterns; ++i) {
if (fnmatch(fpattern[i].pat, fname, 0) == 0 ||
fnmatch(fpattern[i].pat, fname_base, 0) == 0) {
if (fpattern[i].mode == EXCL_PAT) {
ret = false;
break;
} else
ret = true;
}
}
free(fname_buf);
return (ret);
}
static inline bool
dir_matching(const char *dname)
{
bool ret;
ret = dinclude ? false : true;
for (unsigned int i = 0; i < dpatterns; ++i) {
if (dname != NULL &&
fnmatch(dpattern[i].pat, dname, 0) == 0) {
if (dpattern[i].mode == EXCL_PAT)
return (false);
else
ret = true;
}
}
return (ret);
}
/*
* Processes a directory when a recursive search is performed with
* the -R option. Each appropriate file is passed to procfile().
*/
int
grep_tree(char **argv)
{
FTS *fts;
FTSENT *p;
int c, fts_flags;
bool ok;
const char *wd[] = { ".", NULL };
c = fts_flags = 0;
switch(linkbehave) {
case LINK_EXPLICIT:
fts_flags = FTS_COMFOLLOW;
break;
case LINK_SKIP:
fts_flags = FTS_PHYSICAL;
break;
default:
fts_flags = FTS_LOGICAL;
}
fts_flags |= FTS_NOSTAT | FTS_NOCHDIR;
fts = fts_open((argv[0] == NULL) ?
__DECONST(char * const *, wd) : argv, fts_flags, NULL);
if (fts == NULL)
err(2, "fts_open");
while ((p = fts_read(fts)) != NULL) {
switch (p->fts_info) {
case FTS_DNR:
/* FALLTHROUGH */
case FTS_ERR:
file_err = true;
if(!sflag)
warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
break;
case FTS_D:
/* FALLTHROUGH */
case FTS_DP:
if (dexclude || dinclude)
if (!dir_matching(p->fts_name) ||
!dir_matching(p->fts_path))
fts_set(fts, p, FTS_SKIP);
break;
case FTS_DC:
/* Print a warning for recursive directory loop */
warnx("warning: %s: recursive directory loop",
p->fts_path);
break;
default:
/* Check for file exclusion/inclusion */
ok = true;
if (fexclude || finclude)
ok &= file_matching(p->fts_path);
if (ok)
c += procfile(p->fts_path);
break;
}
}
fts_close(fts);
return (c);
}
/*
* Opens a file and processes it. Each file is processed line-by-line
* passing the lines to procline().
*/
int
procfile(const char *fn)
{
struct parsec pc;
long long tail;
struct file *f;
struct stat sb;
struct str *ln;
mode_t s;
int c, last_outed, t;
bool doctx, printmatch, same_file;
if (strcmp(fn, "-") == 0) {
fn = label != NULL ? label : getstr(1);
f = grep_open(NULL);
} else {
if (!stat(fn, &sb)) {
/* Check if we need to process the file */
s = sb.st_mode & S_IFMT;
if (s == S_IFDIR && dirbehave == DIR_SKIP)
return (0);
if ((s == S_IFIFO || s == S_IFCHR || s == S_IFBLK
|| s == S_IFSOCK) && devbehave == DEV_SKIP)
return (0);
}
f = grep_open(fn);
}
if (f == NULL) {
file_err = true;
if (!sflag)
warn("%s", fn);
return (0);
}
/* Convenience */
ln = &pc.ln;
pc.ln.file = grep_malloc(strlen(fn) + 1);
strcpy(pc.ln.file, fn);
pc.ln.line_no = 0;
pc.ln.len = 0;
pc.ln.boff = 0;
pc.ln.off = -1;
pc.binary = f->binary;
pc.printed = 0;
tail = 0;
last_outed = 0;
same_file = false;
doctx = false;
printmatch = true;
if ((pc.binary && binbehave == BINFILE_BIN) || cflag || qflag ||
lflag || Lflag)
printmatch = false;
if (printmatch && (Aflag != 0 || Bflag != 0))
doctx = true;
mcount = mlimit;
for (c = 0; c == 0 || !(lflag || qflag); ) {
/* Reset per-line statistics */
pc.printed = 0;
pc.matchidx = 0;
pc.lnstart = 0;
pc.ln.boff = 0;
pc.ln.off += pc.ln.len + 1;
if ((pc.ln.dat = grep_fgetln(f, &pc.ln.len)) == NULL ||
pc.ln.len == 0)
break;
if (pc.ln.len > 0 && pc.ln.dat[pc.ln.len - 1] == fileeol)
--pc.ln.len;
pc.ln.line_no++;
/* Return if we need to skip a binary file */
if (pc.binary && binbehave == BINFILE_SKIP) {
grep_close(f);
free(pc.ln.file);
free(f);
return (0);
}
if ((t = procline(&pc)) == 0)
++c;
/* Deal with any -B context or context separators */
if (t == 0 && doctx) {
if (!first_match && (!same_file || last_outed > 0))
printf("--\n");
if (Bflag > 0)
printqueue();
tail = Aflag;
}
/* Print the matching line, but only if not quiet/binary */
if (t == 0 && printmatch) {
printline(&pc, ':');
while (pc.matchidx >= MAX_MATCHES) {
/* Reset matchidx and try again */
pc.matchidx = 0;
if (procline(&pc) == 0)
printline(&pc, ':');
else
break;
}
first_match = false;
same_file = true;
last_outed = 0;
}
if (t != 0 && doctx) {
/* Deal with any -A context */
if (tail > 0) {
grep_printline(&pc.ln, '-');
tail--;
if (Bflag > 0)
clearqueue();
} else {
/*
* Enqueue non-matching lines for -B context.
* If we're not actually doing -B context or if
* the enqueue resulted in a line being rotated
* out, then go ahead and increment last_outed
* to signify a gap between context/match.
*/
if (Bflag == 0 || (Bflag > 0 && enqueue(ln)))
++last_outed;
}
}
/* Count the matches if we have a match limit */
if (t == 0 && mflag) {
--mcount;
if (mflag && mcount <= 0)
break;
}
}
if (Bflag > 0)
clearqueue();
grep_close(f);
if (cflag) {
if (!hflag)
printf("%s:", pc.ln.file);
printf("%u\n", c);
}
if (lflag && !qflag && c != 0)
printf("%s%c", fn, nullflag ? 0 : '\n');
if (Lflag && !qflag && c == 0)
printf("%s%c", fn, nullflag ? 0 : '\n');
if (c && !cflag && !lflag && !Lflag &&
binbehave == BINFILE_BIN && f->binary && !qflag)
printf(getstr(8), fn);
free(pc.ln.file);
free(f);
return (c);
}
#ifdef WITH_INTERNAL_NOSPEC
/*
* Internal implementation of literal string search within a string, modeled
* after regexec(3), for use when the regex(3) implementation doesn't offer
* either REG_NOSPEC or REG_LITERAL. This does not apply in the default FreeBSD
* config, but in other scenarios such as building against libgnuregex or on
* some non-FreeBSD OSes.
*/
static int
litexec(const struct pat *pat, const char *string, size_t nmatch,
regmatch_t pmatch[])
{
char *(*strstr_fn)(const char *, const char *);
char *sub, *subject;
const char *search;
size_t idx, n, ofs, stringlen;
if (cflags & REG_ICASE)
strstr_fn = strcasestr;
else
strstr_fn = strstr;
idx = 0;
ofs = pmatch[0].rm_so;
stringlen = pmatch[0].rm_eo;
if (ofs >= stringlen)
return (REG_NOMATCH);
subject = strndup(string, stringlen);
if (subject == NULL)
return (REG_ESPACE);
for (n = 0; ofs < stringlen;) {
search = (subject + ofs);
if ((unsigned long)pat->len > strlen(search))
break;
sub = strstr_fn(search, pat->pat);
/*
* Ignoring the empty string possibility due to context: grep optimizes
* for empty patterns and will never reach this point.
*/
if (sub == NULL)
break;
++n;
/* Fill in pmatch if necessary */
if (nmatch > 0) {
pmatch[idx].rm_so = ofs + (sub - search);
pmatch[idx].rm_eo = pmatch[idx].rm_so + pat->len;
if (++idx == nmatch)
break;
ofs = pmatch[idx].rm_so + 1;
} else
/* We only needed to know if we match or not */
break;
}
free(subject);
if (n > 0 && nmatch > 0)
for (n = idx; n < nmatch; ++n)
pmatch[n].rm_so = pmatch[n].rm_eo = -1;
return (n > 0 ? 0 : REG_NOMATCH);
}
#endif /* WITH_INTERNAL_NOSPEC */
#define iswword(x) (iswalnum((x)) || (x) == L'_')
/*
* Processes a line comparing it with the specified patterns. Each pattern
* is looped to be compared along with the full string, saving each and every
* match, which is necessary to colorize the output and to count the
* matches. The matching lines are passed to printline() to display the
* appropriate output.
*/
static int
procline(struct parsec *pc)
{
regmatch_t pmatch, lastmatch, chkmatch;
wchar_t wbegin, wend;
size_t st, nst;
unsigned int i;
int c = 0, r = 0, lastmatches = 0, leflags = eflags;
size_t startm = 0, matchidx;
unsigned int retry;
matchidx = pc->matchidx;
/* Special case: empty pattern with -w flag, check first character */
if (matchall && wflag) {
if (pc->ln.len == 0)
return (0);
wend = L' ';
if (sscanf(&pc->ln.dat[0], "%lc", &wend) != 1 || iswword(wend))
return (1);
else
return (0);
} else if (matchall)
return (0);
st = pc->lnstart;
nst = 0;
/* Initialize to avoid a false positive warning from GCC. */
lastmatch.rm_so = lastmatch.rm_eo = 0;
/* Loop to process the whole line */
while (st <= pc->ln.len) {
lastmatches = 0;
startm = matchidx;
retry = 0;
if (st > 0 && pc->ln.dat[st - 1] != fileeol)
leflags |= REG_NOTBOL;
/* Loop to compare with all the patterns */
for (i = 0; i < patterns; i++) {
pmatch.rm_so = st;
pmatch.rm_eo = pc->ln.len;
#ifdef WITH_INTERNAL_NOSPEC
if (grepbehave == GREP_FIXED)
r = litexec(&pattern[i], pc->ln.dat, 1, &pmatch);
else
#endif
#ifndef WITHOUT_FASTMATCH
if (fg_pattern[i].pattern)
r = fastexec(&fg_pattern[i],
pc->ln.dat, 1, &pmatch, leflags);
else
#endif
r = regexec(&r_pattern[i], pc->ln.dat, 1,
&pmatch, leflags);
if (r != 0)
continue;
/* Check for full match */
if (xflag && (pmatch.rm_so != 0 ||
(size_t)pmatch.rm_eo != pc->ln.len))
continue;
/* Check for whole word match */
#ifndef WITHOUT_FASTMATCH
if (wflag || fg_pattern[i].word) {
#else
if (wflag) {
#endif
wbegin = wend = L' ';
if (pmatch.rm_so != 0 &&
sscanf(&pc->ln.dat[pmatch.rm_so - 1],
"%lc", &wbegin) != 1)
r = REG_NOMATCH;
else if ((size_t)pmatch.rm_eo !=
pc->ln.len &&
sscanf(&pc->ln.dat[pmatch.rm_eo],
"%lc", &wend) != 1)
r = REG_NOMATCH;
else if (iswword(wbegin) ||
iswword(wend))
r = REG_NOMATCH;
/*
* If we're doing whole word matching and we
* matched once, then we should try the pattern
* again after advancing just past the start of
* the earliest match. This allows the pattern
* to match later on in the line and possibly
* still match a whole word.
*/
if (r == REG_NOMATCH &&
(retry == pc->lnstart ||
(unsigned int)pmatch.rm_so + 1 < retry))
retry = pmatch.rm_so + 1;
if (r == REG_NOMATCH)
continue;
}
lastmatches++;
lastmatch = pmatch;
if (matchidx == 0)
c++;
/*
* Replace previous match if the new one is earlier
* and/or longer. This will lead to some amount of
* extra work if -o/--color are specified, but it's
* worth it from a correctness point of view.
*/
if (matchidx > startm) {
chkmatch = pc->matches[matchidx - 1];
if (pmatch.rm_so < chkmatch.rm_so ||
(pmatch.rm_so == chkmatch.rm_so &&
(pmatch.rm_eo - pmatch.rm_so) >
(chkmatch.rm_eo - chkmatch.rm_so))) {
pc->matches[matchidx - 1] = pmatch;
nst = pmatch.rm_eo;
}
} else {
/* Advance as normal if not */
pc->matches[matchidx++] = pmatch;
nst = pmatch.rm_eo;
}
/* avoid excessive matching - skip further patterns */
if ((color == NULL && !oflag) || qflag || lflag ||
matchidx >= MAX_MATCHES) {
pc->lnstart = nst;
lastmatches = 0;
break;
}
}
/*
* Advance to just past the start of the earliest match, try
* again just in case we still have a chance to match later in
* the string.
*/
if (lastmatches == 0 && retry > pc->lnstart) {
st = retry;
continue;
}
/* One pass if we are not recording matches */
if (!wflag && ((color == NULL && !oflag) || qflag || lflag || Lflag))
break;
/* If we didn't have any matches or REG_NOSUB set */
if (lastmatches == 0 || (cflags & REG_NOSUB))
nst = pc->ln.len;
if (lastmatches == 0)
/* No matches */
break;
else if (st == nst && lastmatch.rm_so == lastmatch.rm_eo)
/* Zero-length match -- advance one more so we don't get stuck */
nst++;
/* Advance st based on previous matches */
st = nst;
pc->lnstart = st;
}
/* Reflect the new matchidx in the context */
pc->matchidx = matchidx;
if (vflag)
c = !c;
return (c ? 0 : 1);
}
/*
* Safe malloc() for internal use.
*/
void *
grep_malloc(size_t size)
{
void *ptr;
if ((ptr = malloc(size)) == NULL)
err(2, "malloc");
return (ptr);
}
/*
* Safe calloc() for internal use.
*/
void *
grep_calloc(size_t nmemb, size_t size)
{
void *ptr;
if ((ptr = calloc(nmemb, size)) == NULL)
err(2, "calloc");
return (ptr);
}
/*
* Safe realloc() for internal use.
*/
void *
grep_realloc(void *ptr, size_t size)
{
if ((ptr = realloc(ptr, size)) == NULL)
err(2, "realloc");
return (ptr);
}
/*
* Safe strdup() for internal use.
*/
char *
grep_strdup(const char *str)
{
char *ret;
if ((ret = strdup(str)) == NULL)
err(2, "strdup");
return (ret);
}
/*
* Print an entire line as-is, there are no inline matches to consider. This is
* used for printing context.
*/
void grep_printline(struct str *line, int sep) {
printline_metadata(line, sep);
fwrite(line->dat, line->len, 1, stdout);
putchar(fileeol);
}
static void
printline_metadata(struct str *line, int sep)
{
bool printsep;
printsep = false;
if (!hflag) {
if (!nullflag) {
fputs(line->file, stdout);
printsep = true;
} else {
printf("%s", line->file);
putchar(0);
}
}
if (nflag) {
if (printsep)
putchar(sep);
printf("%d", line->line_no);
printsep = true;
}
if (bflag) {
if (printsep)
putchar(sep);
printf("%lld", (long long)(line->off + line->boff));
printsep = true;
}
if (printsep)
putchar(sep);
}
/*
* Prints a matching line according to the command line options.
*/
static void
printline(struct parsec *pc, int sep)
{
size_t a = 0;
size_t i, matchidx;
regmatch_t match;
/* If matchall, everything matches but don't actually print for -o */
if (oflag && matchall)
return;
matchidx = pc->matchidx;
/* --color and -o */
if ((oflag || color) && matchidx > 0) {
/* Only print metadata once per line if --color */
if (!oflag && pc->printed == 0)
printline_metadata(&pc->ln, sep);
for (i = 0; i < matchidx; i++) {
match = pc->matches[i];
/* Don't output zero length matches */
if (match.rm_so == match.rm_eo)
continue;
/*
* Metadata is printed on a per-line basis, so every
* match gets file metadata with the -o flag.
*/
if (oflag) {
pc->ln.boff = match.rm_so;
printline_metadata(&pc->ln, sep);
} else
fwrite(pc->ln.dat + a, match.rm_so - a, 1,
stdout);
if (color)
fprintf(stdout, "\33[%sm\33[K", color);
fwrite(pc->ln.dat + match.rm_so,
match.rm_eo - match.rm_so, 1, stdout);
if (color)
fprintf(stdout, "\33[m\33[K");
a = match.rm_eo;
if (oflag)
putchar('\n');
}
if (!oflag) {
if (pc->ln.len - a > 0)
fwrite(pc->ln.dat + a, pc->ln.len - a, 1,
stdout);
putchar('\n');
}
} else
grep_printline(&pc->ln, sep);
pc->printed++;
}