5016d112ad
The read buffer in cnt() is 64 kB, which is a bit excessive for a stack variable. MAXBSIZE has grown since this code was originally written, and it might grow again in the future. Since the program is single-threaded and cnt() does not recurse, we can safely make the buffer static. While there, constify p since it is only used to read. Sponsored by: Klara, Inc. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D38608
370 lines
8.5 KiB
C
370 lines
8.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1987, 1991, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)wc.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/capsicum.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <capsicum_helpers.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdint.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 <libxo/xo.h>
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#include <libcasper.h>
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#include <casper/cap_fileargs.h>
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static const char *stdin_filename = "stdin";
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static fileargs_t *fa;
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static uintmax_t tlinect, twordct, tcharct, tlongline;
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static bool doline, doword, dochar, domulti, dolongline;
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static volatile sig_atomic_t siginfo;
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static xo_handle_t *stderr_handle;
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static void show_cnt(const char *file, uintmax_t linect, uintmax_t wordct,
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uintmax_t charct, uintmax_t llct);
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static int cnt(const char *);
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static void usage(void);
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static void
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siginfo_handler(int sig __unused)
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{
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siginfo = 1;
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}
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static void
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reset_siginfo(void)
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{
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signal(SIGINFO, SIG_DFL);
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siginfo = 0;
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}
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int
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main(int argc, char *argv[])
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{
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int ch, errors, total;
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cap_rights_t rights;
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(void) setlocale(LC_CTYPE, "");
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argc = xo_parse_args(argc, argv);
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if (argc < 0)
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exit(EXIT_FAILURE);
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while ((ch = getopt(argc, argv, "clmwL")) != -1)
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switch((char)ch) {
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case 'l':
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doline = true;
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break;
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case 'w':
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doword = true;
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break;
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case 'c':
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dochar = true;
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domulti = false;
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break;
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case 'L':
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dolongline = true;
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break;
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case 'm':
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domulti = true;
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dochar = false;
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break;
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case '?':
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default:
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usage();
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}
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argv += optind;
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argc -= optind;
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(void)signal(SIGINFO, siginfo_handler);
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fa = fileargs_init(argc, argv, O_RDONLY, 0,
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cap_rights_init(&rights, CAP_READ, CAP_FSTAT), FA_OPEN);
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if (fa == NULL)
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xo_err(EXIT_FAILURE, "Unable to initialize casper");
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caph_cache_catpages();
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if (caph_limit_stdio() < 0)
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xo_err(EXIT_FAILURE, "Unable to limit stdio");
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if (caph_enter_casper() < 0)
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xo_err(EXIT_FAILURE, "Unable to enter capability mode");
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/* Wc's flags are on by default. */
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if (!(doline || doword || dochar || domulti || dolongline))
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doline = doword = dochar = true;
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stderr_handle = xo_create_to_file(stderr, XO_STYLE_TEXT, 0);
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xo_open_container("wc");
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xo_open_list("file");
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errors = 0;
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total = 0;
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if (argc == 0) {
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xo_open_instance("file");
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if (cnt(NULL) != 0)
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++errors;
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xo_close_instance("file");
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} else {
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while (argc--) {
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xo_open_instance("file");
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if (cnt(*argv++) != 0)
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++errors;
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xo_close_instance("file");
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++total;
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}
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}
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xo_close_list("file");
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if (total > 1) {
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xo_open_container("total");
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show_cnt("total", tlinect, twordct, tcharct, tlongline);
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xo_close_container("total");
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}
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fileargs_free(fa);
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xo_close_container("wc");
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if (xo_finish() < 0)
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xo_err(EXIT_FAILURE, "stdout");
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exit(errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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static void
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show_cnt(const char *file, uintmax_t linect, uintmax_t wordct,
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uintmax_t charct, uintmax_t llct)
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{
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xo_handle_t *xop;
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if (!siginfo)
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xop = NULL;
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else {
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xop = stderr_handle;
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siginfo = 0;
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}
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if (doline)
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xo_emit_h(xop, " {:lines/%7ju/%ju}", linect);
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if (doword)
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xo_emit_h(xop, " {:words/%7ju/%ju}", wordct);
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if (dochar || domulti)
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xo_emit_h(xop, " {:characters/%7ju/%ju}", charct);
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if (dolongline)
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xo_emit_h(xop, " {:long-lines/%7ju/%ju}", llct);
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if (file != stdin_filename)
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xo_emit_h(xop, " {:filename/%s}\n", file);
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else
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xo_emit_h(xop, "\n");
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}
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static int
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cnt(const char *file)
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{
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static char buf[MAXBSIZE];
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struct stat sb;
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mbstate_t mbs;
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const char *p;
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uintmax_t linect, wordct, charct, llct, tmpll;
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ssize_t len;
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size_t clen;
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int fd;
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wchar_t wch;
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bool gotsp, warned;
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linect = wordct = charct = llct = tmpll = 0;
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if (file == NULL) {
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fd = STDIN_FILENO;
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file = stdin_filename;
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} else if ((fd = fileargs_open(fa, file)) < 0) {
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xo_warn("%s: open", file);
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return (1);
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}
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if (doword || (domulti && MB_CUR_MAX != 1))
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goto word;
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/*
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* If all we need is the number of characters and it's a regular file,
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* just stat it.
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*/
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if (doline == 0 && dolongline == 0) {
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if (fstat(fd, &sb)) {
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xo_warn("%s: fstat", file);
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(void)close(fd);
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return (1);
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}
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if (S_ISREG(sb.st_mode)) {
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reset_siginfo();
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charct = sb.st_size;
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show_cnt(file, linect, wordct, charct, llct);
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tcharct += charct;
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(void)close(fd);
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return (0);
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}
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}
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/*
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* For files we can't stat, or if we need line counting, slurp the
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* file. Line counting is split out because it's a lot faster to get
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* lines than to get words, since the word count requires locale
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* handling.
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*/
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while ((len = read(fd, buf, sizeof(buf))) != 0) {
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if (len < 0) {
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xo_warn("%s: read", file);
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(void)close(fd);
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return (1);
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}
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if (siginfo)
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show_cnt(file, linect, wordct, charct, llct);
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charct += len;
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if (doline || dolongline) {
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for (p = buf; len > 0; --len, ++p) {
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if (*p == '\n') {
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if (tmpll > llct)
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llct = tmpll;
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tmpll = 0;
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++linect;
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} else {
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tmpll++;
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}
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}
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}
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}
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reset_siginfo();
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if (doline)
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tlinect += linect;
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if (dochar)
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tcharct += charct;
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if (dolongline && llct > tlongline)
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tlongline = llct;
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show_cnt(file, linect, wordct, charct, llct);
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(void)close(fd);
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return (0);
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/* Do it the hard way... */
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word: gotsp = true;
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warned = false;
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memset(&mbs, 0, sizeof(mbs));
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while ((len = read(fd, buf, sizeof(buf))) != 0) {
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if (len < 0) {
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xo_warn("%s: read", file);
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(void)close(fd);
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return (1);
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}
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p = buf;
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while (len > 0) {
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if (siginfo)
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show_cnt(file, linect, wordct, charct, llct);
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if (!domulti || MB_CUR_MAX == 1) {
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clen = 1;
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wch = (unsigned char)*p;
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} else if ((clen = mbrtowc(&wch, p, len, &mbs)) == 0) {
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clen = 1;
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} else if (clen == (size_t)-1) {
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if (!warned) {
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errno = EILSEQ;
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xo_warn("%s", file);
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warned = true;
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}
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memset(&mbs, 0, sizeof(mbs));
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clen = 1;
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wch = (unsigned char)*p;
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} else if (clen == (size_t)-2) {
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break;
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}
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charct++;
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if (wch != L'\n')
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tmpll++;
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len -= clen;
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p += clen;
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if (wch == L'\n') {
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if (tmpll > llct)
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llct = tmpll;
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tmpll = 0;
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++linect;
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}
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if (iswspace(wch)) {
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gotsp = true;
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} else if (gotsp) {
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gotsp = false;
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++wordct;
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}
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}
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}
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reset_siginfo();
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if (domulti && MB_CUR_MAX > 1) {
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if (mbrtowc(NULL, NULL, 0, &mbs) == (size_t)-1 && !warned)
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xo_warn("%s", file);
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}
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if (doline)
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tlinect += linect;
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if (doword)
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twordct += wordct;
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if (dochar || domulti)
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tcharct += charct;
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if (dolongline && llct > tlongline)
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tlongline = llct;
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show_cnt(file, linect, wordct, charct, llct);
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(void)close(fd);
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return (0);
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}
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static void
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usage(void)
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{
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xo_error("usage: wc [-Lclmw] [file ...]\n");
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exit(EXIT_FAILURE);
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}
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