536 lines
12 KiB
C
536 lines
12 KiB
C
/* $NetBSD: util.c,v 1.9 2011/02/27 17:33:37 joerg Exp $ */
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/* $FreeBSD$ */
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/* $OpenBSD: util.c,v 1.39 2010/07/02 22:18:03 tedu Exp $ */
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/*-
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* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
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* Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fnmatch.h>
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#include <fts.h>
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#include <libgen.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#include "fastmatch.h"
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#include "grep.h"
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static int linesqueued;
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static int procline(struct str *l, int);
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bool
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file_matching(const char *fname)
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{
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char *fname_base, *fname_buf;
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bool ret;
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ret = finclude ? false : true;
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fname_buf = strdup(fname);
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if (fname_buf == NULL)
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err(2, "strdup");
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fname_base = basename(fname_buf);
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for (unsigned int i = 0; i < fpatterns; ++i) {
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if (fnmatch(fpattern[i].pat, fname, 0) == 0 ||
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fnmatch(fpattern[i].pat, fname_base, 0) == 0) {
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if (fpattern[i].mode == EXCL_PAT) {
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ret = false;
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break;
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} else
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ret = true;
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}
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}
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free(fname_buf);
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return (ret);
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}
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static inline bool
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dir_matching(const char *dname)
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{
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bool ret;
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ret = dinclude ? false : true;
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for (unsigned int i = 0; i < dpatterns; ++i) {
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if (dname != NULL &&
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fnmatch(dpattern[i].pat, dname, 0) == 0) {
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if (dpattern[i].mode == EXCL_PAT)
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return (false);
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else
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ret = true;
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}
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}
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return (ret);
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}
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/*
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* Processes a directory when a recursive search is performed with
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* the -R option. Each appropriate file is passed to procfile().
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*/
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int
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grep_tree(char **argv)
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{
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FTS *fts;
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FTSENT *p;
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int c, fts_flags;
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bool ok;
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c = fts_flags = 0;
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switch(linkbehave) {
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case LINK_EXPLICIT:
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fts_flags = FTS_COMFOLLOW;
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break;
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case LINK_SKIP:
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fts_flags = FTS_PHYSICAL;
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break;
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default:
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fts_flags = FTS_LOGICAL;
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}
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fts_flags |= FTS_NOSTAT | FTS_NOCHDIR;
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if (!(fts = fts_open(argv, fts_flags, NULL)))
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err(2, "fts_open");
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while ((p = fts_read(fts)) != NULL) {
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switch (p->fts_info) {
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case FTS_DNR:
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/* FALLTHROUGH */
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case FTS_ERR:
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file_err = true;
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if(!sflag)
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warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
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break;
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case FTS_D:
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/* FALLTHROUGH */
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case FTS_DP:
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if (dexclude || dinclude)
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if (!dir_matching(p->fts_name) ||
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!dir_matching(p->fts_path))
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fts_set(fts, p, FTS_SKIP);
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break;
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case FTS_DC:
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/* Print a warning for recursive directory loop */
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warnx("warning: %s: recursive directory loop",
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p->fts_path);
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break;
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default:
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/* Check for file exclusion/inclusion */
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ok = true;
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if (fexclude || finclude)
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ok &= file_matching(p->fts_path);
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if (ok)
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c += procfile(p->fts_path);
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break;
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}
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}
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fts_close(fts);
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return (c);
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}
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/*
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* Opens a file and processes it. Each file is processed line-by-line
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* passing the lines to procline().
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*/
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int
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procfile(const char *fn)
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{
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struct file *f;
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struct stat sb;
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struct str ln;
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mode_t s;
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int c, t;
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mcount = mlimit;
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if (strcmp(fn, "-") == 0) {
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fn = label != NULL ? label : getstr(1);
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f = grep_open(NULL);
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} else {
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if (!stat(fn, &sb)) {
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/* Check if we need to process the file */
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s = sb.st_mode & S_IFMT;
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if (s == S_IFDIR && dirbehave == DIR_SKIP)
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return (0);
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if ((s == S_IFIFO || s == S_IFCHR || s == S_IFBLK
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|| s == S_IFSOCK) && devbehave == DEV_SKIP)
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return (0);
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}
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f = grep_open(fn);
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}
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if (f == NULL) {
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file_err = true;
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if (!sflag)
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warn("%s", fn);
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return (0);
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}
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ln.file = grep_malloc(strlen(fn) + 1);
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strcpy(ln.file, fn);
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ln.line_no = 0;
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ln.len = 0;
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linesqueued = 0;
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tail = 0;
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ln.off = -1;
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for (c = 0; c == 0 || !(lflag || qflag); ) {
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ln.off += ln.len + 1;
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if ((ln.dat = grep_fgetln(f, &ln.len)) == NULL || ln.len == 0) {
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if (ln.line_no == 0 && matchall)
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exit(0);
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else
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break;
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}
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if (ln.len > 0 && ln.dat[ln.len - 1] == '\n')
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--ln.len;
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ln.line_no++;
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/* Return if we need to skip a binary file */
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if (f->binary && binbehave == BINFILE_SKIP) {
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grep_close(f);
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free(ln.file);
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free(f);
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return (0);
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}
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/* Process the file line-by-line */
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if ((t = procline(&ln, f->binary)) == 0 && Bflag > 0) {
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enqueue(&ln);
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linesqueued++;
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}
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c += t;
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if (mflag && mcount <= 0)
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break;
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}
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if (Bflag > 0)
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clearqueue();
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grep_close(f);
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if (cflag) {
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if (!hflag)
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printf("%s:", ln.file);
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printf("%u\n", c);
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}
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if (lflag && !qflag && c != 0)
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printf("%s%c", fn, nullflag ? 0 : '\n');
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if (Lflag && !qflag && c == 0)
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printf("%s%c", fn, nullflag ? 0 : '\n');
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if (c && !cflag && !lflag && !Lflag &&
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binbehave == BINFILE_BIN && f->binary && !qflag)
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printf(getstr(8), fn);
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free(ln.file);
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free(f);
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return (c);
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}
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#define iswword(x) (iswalnum((x)) || (x) == L'_')
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/*
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* Processes a line comparing it with the specified patterns. Each pattern
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* is looped to be compared along with the full string, saving each and every
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* match, which is necessary to colorize the output and to count the
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* matches. The matching lines are passed to printline() to display the
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* appropriate output.
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*/
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static int
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procline(struct str *l, int nottext)
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{
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regmatch_t matches[MAX_LINE_MATCHES];
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regmatch_t pmatch, lastmatch;
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size_t st = 0, nst = 0;
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unsigned int i;
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int c = 0, m = 0, r = 0, lastmatches = 0, leflags = eflags;
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int startm = 0;
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/* Initialize to avoid a false positive warning from GCC. */
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lastmatch.rm_so = lastmatch.rm_eo = 0;
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/* Loop to process the whole line */
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while (st <= l->len) {
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lastmatches = 0;
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startm = m;
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if (st > 0)
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leflags |= REG_NOTBOL;
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/* Loop to compare with all the patterns */
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for (i = 0; i < patterns; i++) {
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pmatch.rm_so = st;
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pmatch.rm_eo = l->len;
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if (fg_pattern[i].pattern)
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r = fastexec(&fg_pattern[i],
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l->dat, 1, &pmatch, leflags);
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else
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r = regexec(&r_pattern[i], l->dat, 1,
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&pmatch, leflags);
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r = (r == 0) ? 0 : REG_NOMATCH;
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if (r == REG_NOMATCH)
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continue;
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/* Check for full match */
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if (r == 0 && xflag)
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if (pmatch.rm_so != 0 ||
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(size_t)pmatch.rm_eo != l->len)
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r = REG_NOMATCH;
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/* Check for whole word match */
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if (r == 0 && (wflag || fg_pattern[i].word)) {
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wchar_t wbegin, wend;
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wbegin = wend = L' ';
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if (pmatch.rm_so != 0 &&
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sscanf(&l->dat[pmatch.rm_so - 1],
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"%lc", &wbegin) != 1)
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r = REG_NOMATCH;
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else if ((size_t)pmatch.rm_eo !=
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l->len &&
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sscanf(&l->dat[pmatch.rm_eo],
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"%lc", &wend) != 1)
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r = REG_NOMATCH;
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else if (iswword(wbegin) ||
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iswword(wend))
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r = REG_NOMATCH;
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}
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if (r == 0) {
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lastmatches++;
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lastmatch = pmatch;
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/* Skip over zero-length matches */
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if (pmatch.rm_so == pmatch.rm_eo)
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continue;
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if (m == 0)
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c++;
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if (m < MAX_LINE_MATCHES) {
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/* Replace previous match if the new one is earlier and/or longer */
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if (m > startm) {
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if (pmatch.rm_so < matches[m-1].rm_so ||
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(pmatch.rm_so == matches[m-1].rm_so && (pmatch.rm_eo - pmatch.rm_so) > (matches[m-1].rm_eo - matches[m-1].rm_so))) {
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matches[m-1] = pmatch;
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nst = pmatch.rm_eo;
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}
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} else {
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/* Advance as normal if not */
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matches[m++] = pmatch;
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nst = pmatch.rm_eo;
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}
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}
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/* matches - skip further patterns */
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if ((color == NULL && !oflag) ||
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qflag || lflag)
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break;
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}
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}
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if (vflag) {
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c = !c;
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break;
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}
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/* One pass if we are not recording matches */
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if (!wflag && ((color == NULL && !oflag) || qflag || lflag || Lflag))
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break;
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/* If we didn't have any matches or REG_NOSUB set */
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if (lastmatches == 0 || (cflags & REG_NOSUB))
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nst = l->len;
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if (lastmatches == 0)
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/* No matches */
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break;
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else if (st == nst && lastmatch.rm_so == lastmatch.rm_eo)
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/* Zero-length match -- advance one more so we don't get stuck */
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nst++;
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/* Advance st based on previous matches */
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st = nst;
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}
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/* Count the matches if we have a match limit */
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if (mflag)
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mcount -= c;
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if (c && binbehave == BINFILE_BIN && nottext)
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return (c); /* Binary file */
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/* Dealing with the context */
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if ((tail || c) && !cflag && !qflag && !lflag && !Lflag) {
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if (c) {
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if (!first && !prev && !tail && Aflag)
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printf("--\n");
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tail = Aflag;
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if (Bflag > 0) {
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if (!first && !prev)
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printf("--\n");
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printqueue();
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}
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linesqueued = 0;
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printline(l, ':', matches, m);
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} else {
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printline(l, '-', matches, m);
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tail--;
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}
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}
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if (c) {
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prev = true;
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first = false;
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} else
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prev = false;
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return (c);
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}
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/*
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* Safe malloc() for internal use.
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*/
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void *
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grep_malloc(size_t size)
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{
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void *ptr;
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if ((ptr = malloc(size)) == NULL)
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err(2, "malloc");
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return (ptr);
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}
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/*
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* Safe calloc() for internal use.
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*/
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void *
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grep_calloc(size_t nmemb, size_t size)
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{
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void *ptr;
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if ((ptr = calloc(nmemb, size)) == NULL)
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err(2, "calloc");
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return (ptr);
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}
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/*
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* Safe realloc() for internal use.
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*/
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void *
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grep_realloc(void *ptr, size_t size)
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{
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if ((ptr = realloc(ptr, size)) == NULL)
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err(2, "realloc");
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return (ptr);
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}
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/*
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* Safe strdup() for internal use.
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*/
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char *
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grep_strdup(const char *str)
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{
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char *ret;
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if ((ret = strdup(str)) == NULL)
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err(2, "strdup");
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return (ret);
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}
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/*
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* Prints a matching line according to the command line options.
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*/
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void
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printline(struct str *line, int sep, regmatch_t *matches, int m)
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{
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size_t a = 0;
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int i, n = 0;
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/* If matchall, everything matches but don't actually print for -o */
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if (oflag && matchall)
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return;
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if (!hflag) {
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if (!nullflag) {
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fputs(line->file, stdout);
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++n;
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} else {
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printf("%s", line->file);
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putchar(0);
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}
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}
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if (nflag) {
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if (n > 0)
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putchar(sep);
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printf("%d", line->line_no);
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++n;
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}
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if (bflag) {
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if (n > 0)
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putchar(sep);
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printf("%lld", (long long)line->off);
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++n;
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}
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if (n)
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putchar(sep);
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/* --color and -o */
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if ((oflag || color) && m > 0) {
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for (i = 0; i < m; i++) {
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if (!oflag)
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fwrite(line->dat + a, matches[i].rm_so - a, 1,
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stdout);
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if (color)
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fprintf(stdout, "\33[%sm", color);
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fwrite(line->dat + matches[i].rm_so,
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matches[i].rm_eo - matches[i].rm_so, 1,
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stdout);
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if (color)
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fprintf(stdout, "\33[00m\33[K");
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a = matches[i].rm_eo;
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if (oflag)
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putchar('\n');
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}
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if (!oflag) {
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if (line->len - a > 0)
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fwrite(line->dat + a, line->len - a, 1, stdout);
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putchar('\n');
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}
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} else {
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fwrite(line->dat, line->len, 1, stdout);
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putchar('\n');
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}
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}
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