cat.c revision 105781 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kevin Fall.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char const copyright[] =
39"@(#) Copyright (c) 1989, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)cat.c	8.2 (Berkeley) 4/27/95";
46#endif
47#endif /* not lint */
48#include <sys/cdefs.h>
49__FBSDID("$FreeBSD: head/bin/cat/cat.c 105781 2002-10-23 10:23:38Z markm $");
50
51#include <sys/param.h>
52#include <sys/stat.h>
53#ifndef NO_UDOM_SUPPORT
54#include <sys/socket.h>
55#include <sys/un.h>
56#include <errno.h>
57#endif
58
59#include <ctype.h>
60#include <err.h>
61#include <fcntl.h>
62#include <locale.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <unistd.h>
67#include <stddef.h>
68
69int bflag, eflag, nflag, sflag, tflag, vflag;
70int rval;
71const char *filename;
72
73static void usage(void);
74static void scanfiles(char *argv[], int cooked);
75static void cook_cat(FILE *);
76static void raw_cat(int);
77
78#ifndef NO_UDOM_SUPPORT
79static int udom_open(const char *path, int flags);
80#endif
81
82int
83main(int argc, char *argv[])
84{
85	int ch;
86
87	setlocale(LC_CTYPE, "");
88
89	while ((ch = getopt(argc, argv, "benstuv")) != -1)
90		switch (ch) {
91		case 'b':
92			bflag = nflag = 1;	/* -b implies -n */
93			break;
94		case 'e':
95			eflag = vflag = 1;	/* -e implies -v */
96			break;
97		case 'n':
98			nflag = 1;
99			break;
100		case 's':
101			sflag = 1;
102			break;
103		case 't':
104			tflag = vflag = 1;	/* -t implies -v */
105			break;
106		case 'u':
107			setbuf(stdout, NULL);
108			break;
109		case 'v':
110			vflag = 1;
111			break;
112		default:
113			usage();
114		}
115	argv += optind;
116
117	if (bflag || eflag || nflag || sflag || tflag || vflag)
118		scanfiles(argv, 1);
119	else
120		scanfiles(argv, 0);
121	if (fclose(stdout))
122		err(1, "stdout");
123	exit(rval);
124	/* NOTREACHED */
125}
126
127static void
128usage(void)
129{
130	fprintf(stderr, "usage: cat [-benstuv] [file ...]\n");
131	exit(1);
132	/* NOTREACHED */
133}
134
135static void
136scanfiles(char *argv[], int cooked)
137{
138	int i = 0;
139	char *path;
140	FILE *fp;
141
142	while ((path = argv[i]) != NULL || i == 0) {
143		int fd;
144
145		if (path == NULL || strcmp(path, "-") == 0) {
146			filename = "stdin";
147			fd = STDIN_FILENO;
148		} else {
149			filename = path;
150			fd = open(path, O_RDONLY);
151#ifndef NO_UDOM_SUPPORT
152			if (fd < 0 && errno == EOPNOTSUPP)
153				fd = udom_open(path, O_RDONLY);
154#endif
155		}
156		if (fd < 0) {
157			warn("%s", path);
158			rval = 1;
159		} else if (cooked) {
160			if (fd == STDIN_FILENO)
161				cook_cat(stdin);
162			else {
163				fp = fdopen(fd, "r");
164				cook_cat(fp);
165				fclose(fp);
166			}
167		} else {
168			raw_cat(fd);
169			if (fd != STDIN_FILENO)
170				close(fd);
171		}
172		if (path == NULL)
173			break;
174		++i;
175	}
176}
177
178static void
179cook_cat(FILE *fp)
180{
181	int ch, gobble, line, prev;
182
183	/* Reset EOF condition on stdin. */
184	if (fp == stdin && feof(stdin))
185		clearerr(stdin);
186
187	line = gobble = 0;
188	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
189		if (prev == '\n') {
190			if (sflag) {
191				if (ch == '\n') {
192					if (gobble)
193						continue;
194					gobble = 1;
195				} else
196					gobble = 0;
197			}
198			if (nflag && (!bflag || ch != '\n')) {
199				(void)fprintf(stdout, "%6d\t", ++line);
200				if (ferror(stdout))
201					break;
202			}
203		}
204		if (ch == '\n') {
205			if (eflag && putchar('$') == EOF)
206				break;
207		} else if (ch == '\t') {
208			if (tflag) {
209				if (putchar('^') == EOF || putchar('I') == EOF)
210					break;
211				continue;
212			}
213		} else if (vflag) {
214			if (!isascii(ch) && !isprint(ch)) {
215				if (putchar('M') == EOF || putchar('-') == EOF)
216					break;
217				ch = toascii(ch);
218			}
219			if (iscntrl(ch)) {
220				if (putchar('^') == EOF ||
221				    putchar(ch == '\177' ? '?' :
222				    ch | 0100) == EOF)
223					break;
224				continue;
225			}
226		}
227		if (putchar(ch) == EOF)
228			break;
229	}
230	if (ferror(fp)) {
231		warn("%s", filename);
232		rval = 1;
233		clearerr(fp);
234	}
235	if (ferror(stdout))
236		err(1, "stdout");
237}
238
239static void
240raw_cat(int rfd)
241{
242	int off, wfd;
243	ssize_t nr, nw;
244	static size_t bsize;
245	static char *buf = NULL;
246	struct stat sbuf;
247
248	wfd = fileno(stdout);
249	if (buf == NULL) {
250		if (fstat(wfd, &sbuf))
251			err(1, "%s", filename);
252		bsize = MAX(sbuf.st_blksize, 1024);
253		if ((buf = malloc(bsize)) == NULL)
254			err(1, "buffer");
255	}
256	while ((nr = read(rfd, buf, bsize)) > 0)
257		for (off = 0; nr; nr -= nw, off += nw)
258			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
259				err(1, "stdout");
260	if (nr < 0) {
261		warn("%s", filename);
262		rval = 1;
263	}
264}
265
266#ifndef NO_UDOM_SUPPORT
267
268static int
269udom_open(const char *path, int flags)
270{
271	struct sockaddr_un sou;
272	int fd;
273	unsigned int len;
274
275	bzero(&sou, sizeof(sou));
276
277	/*
278	 * Construct the unix domain socket address and attempt to connect
279	 */
280	fd = socket(AF_UNIX, SOCK_STREAM, 0);
281	if (fd >= 0) {
282		sou.sun_family = AF_UNIX;
283		if ((len = strlcpy(sou.sun_path, path,
284		    sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
285			errno = ENAMETOOLONG;
286			return (-1);
287		}
288		len = offsetof(struct sockaddr_un, sun_path[len+1]);
289
290		if (connect(fd, (void *)&sou, len) < 0) {
291			close(fd);
292			fd = -1;
293		}
294	}
295
296	/*
297	 * handle the open flags by shutting down appropriate directions
298	 */
299	if (fd >= 0) {
300		switch(flags & O_ACCMODE) {
301		case O_RDONLY:
302			if (shutdown(fd, SHUT_WR) == -1)
303				perror("cat");
304			break;
305		case O_WRONLY:
306			if (shutdown(fd, SHUT_RD) == -1)
307				perror("cat");
308			break;
309		default:
310			break;
311		}
312	}
313	return(fd);
314}
315
316#endif
317