353 lines
7.4 KiB
C
353 lines
7.4 KiB
C
/* $NetBSD: cat.c,v 1.37 2003/08/07 09:05:01 agc Exp $ */
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/*
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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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* 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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#include <sys/cdefs.h>
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#if defined(__COPYRIGHT) && !defined(lint)
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__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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#if defined(__RCSID) && !defined(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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#else
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__RCSID("$NetBSD: cat.c,v 1.37 2003/08/07 09:05:01 agc Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.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 <fcntl.h>
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#include <locale.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 <vis.h>
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int bflag, eflag, fflag, lflag, nflag, sflag, stdout_ok, tflag, vflag;
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int rval;
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const char *filename;
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int main(int, char *[]);
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void cook_args(char *argv[]);
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void cook_buf(FILE *);
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void raw_args(char *argv[]);
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void raw_cat(int);
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char *printescaped(const char *);
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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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setprogname(argv[0]);
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(void)setlocale(LC_ALL, "");
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while ((ch = getopt(argc, argv, "beflnstuv")) != -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 'f':
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fflag = 1;
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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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case '?':
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(void)fprintf(stderr,
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"usage: cat [-beflnstuv] [-] [file ...]\n");
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exit(1);
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/* NOTREACHED */
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}
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argv += optind;
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stdout_ok = isatty(STDOUT_FILENO);
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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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cook_args(argv);
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else
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raw_args(argv);
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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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void
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cook_args(char **argv)
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{
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FILE *fp;
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fp = stdin;
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filename = "stdin";
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do {
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if (*argv) {
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if (!strcmp(*argv, "-"))
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fp = stdin;
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else if ((fp = fopen(*argv,
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fflag ? "rf" : "r")) == NULL) {
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char *fn;
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fn = printescaped(*argv);
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warn("%s", fn);
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free(fn);
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rval = 1;
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++argv;
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continue;
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}
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filename = *argv++;
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}
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cook_buf(fp);
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if (fp != stdin)
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(void)fclose(fp);
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} while (*argv);
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}
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void
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cook_buf(FILE *fp)
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{
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int ch, gobble, line, prev;
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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 (ch == '\n') {
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if (sflag) {
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if (!gobble && putchar(ch) == EOF)
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break;
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gobble = 1;
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continue;
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}
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if (nflag) {
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if (!bflag) {
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(void)fprintf(stdout,
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"%6d\t", ++line);
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if (ferror(stdout))
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break;
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} else if (eflag) {
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(void)fprintf(stdout,
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"%6s\t", "");
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if (ferror(stdout))
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break;
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}
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}
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} else if (nflag) {
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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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gobble = 0;
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if (ch == '\n') {
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if (eflag)
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if (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)) {
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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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char *fn;
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fn = printescaped(filename);
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warn("%s", fn);
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free(fn);
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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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void
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raw_args(char **argv)
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{
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int fd;
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char *fn;
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fd = fileno(stdin);
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filename = "stdin";
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do {
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if (*argv) {
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if (!strcmp(*argv, "-"))
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fd = fileno(stdin);
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else if (fflag) {
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struct stat st;
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fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
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if (fd < 0)
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goto skip;
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if (fstat(fd, &st) == -1) {
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close(fd);
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goto skip;
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}
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if (!S_ISREG(st.st_mode)) {
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close(fd);
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fn = printescaped(*argv);
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warnx("%s: not a regular file", fn);
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free(fn);
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goto skipnomsg;
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}
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}
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else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
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skip:
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fn = printescaped(*argv);
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warn("%s", fn);
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free(fn);
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skipnomsg:
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rval = 1;
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++argv;
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continue;
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}
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filename = *argv++;
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}
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raw_cat(fd);
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if (fd != fileno(stdin))
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(void)close(fd);
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} while (*argv);
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}
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void
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raw_cat(int rfd)
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{
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static char *buf;
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static char fb_buf[BUFSIZ];
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static size_t bsize;
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struct stat sbuf;
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ssize_t nr, nw, off;
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int wfd;
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char *fn;
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wfd = fileno(stdout);
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if (buf == NULL) {
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if (fstat(wfd, &sbuf) == 0) {
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bsize = sbuf.st_blksize > BUFSIZ ?
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sbuf.st_blksize : BUFSIZ;
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buf = malloc(bsize);
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}
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if (buf == NULL) {
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buf = fb_buf;
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bsize = BUFSIZ;
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}
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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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fn = printescaped(filename);
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warn("%s", fn);
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free(fn);
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rval = 1;
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}
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}
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char *
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printescaped(const char *src)
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{
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size_t len;
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char *retval;
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len = strlen(src);
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if (len != 0 && SIZE_T_MAX/len <= 4) {
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errx(EXIT_FAILURE, "%s: name too long", src);
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/* NOTREACHED */
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}
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retval = (char *)malloc(4*len+1);
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if (retval != NULL) {
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if (stdout_ok)
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(void)strvis(retval, src, VIS_NL | VIS_CSTYLE);
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else
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(void)strcpy(retval, src);
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return retval;
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} else
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errx(EXIT_FAILURE, "out of memory!");
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/* NOTREACHED */
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}
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