aece80a2e8
set an exclusive advisory lock on stdout. This will be used to guarantee orderly writing to METALOG. Sponsored by: DARPA, AFRL Obtained from: NetBSD (mason)
350 lines
7.6 KiB
C
350 lines
7.6 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kevin Fall.
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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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* 4. 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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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1989, 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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#endif
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#ifndef NO_UDOM_SUPPORT
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#endif
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#include <ctype.h>
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#include <err.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stddef.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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static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
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static int rval;
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static const char *filename;
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static void usage(void);
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static void scanfiles(char *argv[], int cooked);
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static void cook_cat(FILE *);
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static void raw_cat(int);
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#ifndef NO_UDOM_SUPPORT
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static int udom_open(const char *path, int flags);
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#endif
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/*
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* Memory strategy threshold, in pages: if physmem is larger than this,
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* use a large buffer.
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*/
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#define PHYSPAGES_THRESHOLD (32 * 1024)
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/* Maximum buffer size in bytes - do not allow it to grow larger than this. */
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#define BUFSIZE_MAX (2 * 1024 * 1024)
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/*
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* Small (default) buffer size in bytes. It's inefficient for this to be
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* smaller than MAXPHYS.
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*/
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#define BUFSIZE_SMALL (MAXPHYS)
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int
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main(int argc, char *argv[])
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{
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int ch;
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struct flock stdout_lock;
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setlocale(LC_CTYPE, "");
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while ((ch = getopt(argc, argv, "belnstuv")) != -1)
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switch (ch) {
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case 'b':
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bflag = nflag = 1; /* -b implies -n */
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break;
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case 'e':
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eflag = vflag = 1; /* -e implies -v */
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break;
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case 'l':
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lflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 't':
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tflag = vflag = 1; /* -t implies -v */
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break;
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case 'u':
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setbuf(stdout, NULL);
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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}
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argv += optind;
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if (lflag) {
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stdout_lock.l_len = 0;
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stdout_lock.l_start = 0;
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stdout_lock.l_type = F_WRLCK;
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stdout_lock.l_whence = SEEK_SET;
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if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
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err(EXIT_FAILURE, "stdout");
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}
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if (bflag || eflag || nflag || sflag || tflag || vflag)
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scanfiles(argv, 1);
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else
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scanfiles(argv, 0);
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if (fclose(stdout))
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err(1, "stdout");
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exit(rval);
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/* NOTREACHED */
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n");
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exit(1);
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/* NOTREACHED */
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}
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static void
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scanfiles(char *argv[], int cooked)
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{
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int fd, i;
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char *path;
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FILE *fp;
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i = 0;
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while ((path = argv[i]) != NULL || i == 0) {
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if (path == NULL || strcmp(path, "-") == 0) {
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filename = "stdin";
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fd = STDIN_FILENO;
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} else {
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filename = path;
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fd = open(path, O_RDONLY);
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#ifndef NO_UDOM_SUPPORT
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if (fd < 0 && errno == EOPNOTSUPP)
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fd = udom_open(path, O_RDONLY);
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#endif
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}
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if (fd < 0) {
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warn("%s", path);
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rval = 1;
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} else if (cooked) {
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if (fd == STDIN_FILENO)
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cook_cat(stdin);
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else {
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fp = fdopen(fd, "r");
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cook_cat(fp);
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fclose(fp);
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}
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} else {
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raw_cat(fd);
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if (fd != STDIN_FILENO)
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close(fd);
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}
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if (path == NULL)
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break;
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++i;
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}
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}
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static void
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cook_cat(FILE *fp)
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{
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int ch, gobble, line, prev;
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/* Reset EOF condition on stdin. */
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if (fp == stdin && feof(stdin))
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clearerr(stdin);
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line = gobble = 0;
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for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
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if (prev == '\n') {
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if (sflag) {
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if (ch == '\n') {
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if (gobble)
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continue;
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gobble = 1;
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} else
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gobble = 0;
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}
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if (nflag && (!bflag || ch != '\n')) {
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(void)fprintf(stdout, "%6d\t", ++line);
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if (ferror(stdout))
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break;
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}
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}
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if (ch == '\n') {
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if (eflag && putchar('$') == EOF)
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break;
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} else if (ch == '\t') {
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if (tflag) {
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if (putchar('^') == EOF || putchar('I') == EOF)
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break;
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continue;
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}
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} else if (vflag) {
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if (!isascii(ch) && !isprint(ch)) {
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if (putchar('M') == EOF || putchar('-') == EOF)
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break;
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ch = toascii(ch);
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}
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if (iscntrl(ch)) {
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if (putchar('^') == EOF ||
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putchar(ch == '\177' ? '?' :
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ch | 0100) == EOF)
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break;
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continue;
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}
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}
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if (putchar(ch) == EOF)
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break;
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}
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if (ferror(fp)) {
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warn("%s", filename);
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rval = 1;
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clearerr(fp);
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}
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if (ferror(stdout))
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err(1, "stdout");
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}
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static void
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raw_cat(int rfd)
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{
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int off, wfd;
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ssize_t nr, nw;
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static size_t bsize;
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static char *buf = NULL;
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struct stat sbuf;
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wfd = fileno(stdout);
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if (buf == NULL) {
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if (fstat(wfd, &sbuf))
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err(1, "stdout");
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if (S_ISREG(sbuf.st_mode)) {
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/* If there's plenty of RAM, use a large copy buffer */
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if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
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bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
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else
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bsize = BUFSIZE_SMALL;
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} else
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bsize = MAX(sbuf.st_blksize,
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(blksize_t)sysconf(_SC_PAGESIZE));
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if ((buf = malloc(bsize)) == NULL)
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err(1, "malloc() failure of IO buffer");
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}
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while ((nr = read(rfd, buf, bsize)) > 0)
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for (off = 0; nr; nr -= nw, off += nw)
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if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
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err(1, "stdout");
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if (nr < 0) {
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warn("%s", filename);
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rval = 1;
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}
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}
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#ifndef NO_UDOM_SUPPORT
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static int
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udom_open(const char *path, int flags)
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{
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struct sockaddr_un sou;
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int fd;
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unsigned int len;
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bzero(&sou, sizeof(sou));
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/*
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* Construct the unix domain socket address and attempt to connect
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*/
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd >= 0) {
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sou.sun_family = AF_UNIX;
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if ((len = strlcpy(sou.sun_path, path,
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sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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len = offsetof(struct sockaddr_un, sun_path[len+1]);
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if (connect(fd, (void *)&sou, len) < 0) {
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close(fd);
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fd = -1;
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}
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}
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/*
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* handle the open flags by shutting down appropriate directions
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*/
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if (fd >= 0) {
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switch(flags & O_ACCMODE) {
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case O_RDONLY:
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if (shutdown(fd, SHUT_WR) == -1)
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warn(NULL);
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break;
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case O_WRONLY:
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if (shutdown(fd, SHUT_RD) == -1)
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warn(NULL);
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break;
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default:
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break;
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}
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}
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return (fd);
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}
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#endif
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