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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39#endif
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)cat.c	8.2 (Berkeley) 4/27/95";
44#endif
45#endif /* not lint */
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD$");
48
49#include <sys/param.h>
50#include <sys/stat.h>
51#ifndef NO_UDOM_SUPPORT
52#include <sys/socket.h>
53#include <sys/un.h>
54#include <errno.h>
55#endif
56
57#include <ctype.h>
58#include <err.h>
59#include <fcntl.h>
60#include <locale.h>
61#include <stddef.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
68static int rval;
69static const char *filename;
70
71static void usage(void) __dead2;
72static void scanfiles(char *argv[], int cooked);
73static void cook_cat(FILE *);
74static void raw_cat(int);
75
76#ifndef NO_UDOM_SUPPORT
77static int udom_open(const char *path, int flags);
78#endif
79
80/*
81 * Memory strategy threshold, in pages: if physmem is larger than this,
82 * use a large buffer.
83 */
84#define	PHYSPAGES_THRESHOLD (32 * 1024)
85
86/* Maximum buffer size in bytes - do not allow it to grow larger than this. */
87#define	BUFSIZE_MAX (2 * 1024 * 1024)
88
89/*
90 * Small (default) buffer size in bytes. It's inefficient for this to be
91 * smaller than MAXPHYS.
92 */
93#define	BUFSIZE_SMALL (MAXPHYS)
94
95int
96main(int argc, char *argv[])
97{
98	int ch;
99	struct flock stdout_lock;
100
101	setlocale(LC_CTYPE, "");
102
103	while ((ch = getopt(argc, argv, "belnstuv")) != -1)
104		switch (ch) {
105		case 'b':
106			bflag = nflag = 1;	/* -b implies -n */
107			break;
108		case 'e':
109			eflag = vflag = 1;	/* -e implies -v */
110			break;
111		case 'l':
112			lflag = 1;
113			break;
114		case 'n':
115			nflag = 1;
116			break;
117		case 's':
118			sflag = 1;
119			break;
120		case 't':
121			tflag = vflag = 1;	/* -t implies -v */
122			break;
123		case 'u':
124			setbuf(stdout, NULL);
125			break;
126		case 'v':
127			vflag = 1;
128			break;
129		default:
130			usage();
131		}
132	argv += optind;
133
134	if (lflag) {
135		stdout_lock.l_len = 0;
136		stdout_lock.l_start = 0;
137		stdout_lock.l_type = F_WRLCK;
138		stdout_lock.l_whence = SEEK_SET;
139		if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
140			err(EXIT_FAILURE, "stdout");
141	}
142
143	if (bflag || eflag || nflag || sflag || tflag || vflag)
144		scanfiles(argv, 1);
145	else
146		scanfiles(argv, 0);
147	if (fclose(stdout))
148		err(1, "stdout");
149	exit(rval);
150	/* NOTREACHED */
151}
152
153static void
154usage(void)
155{
156
157	fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n");
158	exit(1);
159	/* NOTREACHED */
160}
161
162static void
163scanfiles(char *argv[], int cooked)
164{
165	int fd, i;
166	char *path;
167	FILE *fp;
168
169	i = 0;
170	while ((path = argv[i]) != NULL || i == 0) {
171		if (path == NULL || strcmp(path, "-") == 0) {
172			filename = "stdin";
173			fd = STDIN_FILENO;
174		} else {
175			filename = path;
176			fd = open(path, O_RDONLY);
177#ifndef NO_UDOM_SUPPORT
178			if (fd < 0 && errno == EOPNOTSUPP)
179				fd = udom_open(path, O_RDONLY);
180#endif
181		}
182		if (fd < 0) {
183			warn("%s", path);
184			rval = 1;
185		} else if (cooked) {
186			if (fd == STDIN_FILENO)
187				cook_cat(stdin);
188			else {
189				fp = fdopen(fd, "r");
190				cook_cat(fp);
191				fclose(fp);
192			}
193		} else {
194			raw_cat(fd);
195			if (fd != STDIN_FILENO)
196				close(fd);
197		}
198		if (path == NULL)
199			break;
200		++i;
201	}
202}
203
204static void
205cook_cat(FILE *fp)
206{
207	int ch, gobble, line, prev;
208
209	/* Reset EOF condition on stdin. */
210	if (fp == stdin && feof(stdin))
211		clearerr(stdin);
212
213	line = gobble = 0;
214	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
215		if (prev == '\n') {
216			if (sflag) {
217				if (ch == '\n') {
218					if (gobble)
219						continue;
220					gobble = 1;
221				} else
222					gobble = 0;
223			}
224			if (nflag && (!bflag || ch != '\n')) {
225				(void)fprintf(stdout, "%6d\t", ++line);
226				if (ferror(stdout))
227					break;
228			}
229		}
230		if (ch == '\n') {
231			if (eflag && putchar('$') == EOF)
232				break;
233		} else if (ch == '\t') {
234			if (tflag) {
235				if (putchar('^') == EOF || putchar('I') == EOF)
236					break;
237				continue;
238			}
239		} else if (vflag) {
240			if (!isascii(ch) && !isprint(ch)) {
241				if (putchar('M') == EOF || putchar('-') == EOF)
242					break;
243				ch = toascii(ch);
244			}
245			if (iscntrl(ch)) {
246				if (putchar('^') == EOF ||
247				    putchar(ch == '\177' ? '?' :
248				    ch | 0100) == EOF)
249					break;
250				continue;
251			}
252		}
253		if (putchar(ch) == EOF)
254			break;
255	}
256	if (ferror(fp)) {
257		warn("%s", filename);
258		rval = 1;
259		clearerr(fp);
260	}
261	if (ferror(stdout))
262		err(1, "stdout");
263}
264
265static void
266raw_cat(int rfd)
267{
268	int off, wfd;
269	ssize_t nr, nw;
270	static size_t bsize;
271	static char *buf = NULL;
272	struct stat sbuf;
273
274	wfd = fileno(stdout);
275	if (buf == NULL) {
276		if (fstat(wfd, &sbuf))
277			err(1, "stdout");
278		if (S_ISREG(sbuf.st_mode)) {
279			/* If there's plenty of RAM, use a large copy buffer */
280			if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
281				bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
282			else
283				bsize = BUFSIZE_SMALL;
284		} else
285			bsize = MAX(sbuf.st_blksize,
286			    (blksize_t)sysconf(_SC_PAGESIZE));
287		if ((buf = malloc(bsize)) == NULL)
288			err(1, "malloc() failure of IO buffer");
289	}
290	while ((nr = read(rfd, buf, bsize)) > 0)
291		for (off = 0; nr; nr -= nw, off += nw)
292			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
293				err(1, "stdout");
294	if (nr < 0) {
295		warn("%s", filename);
296		rval = 1;
297	}
298}
299
300#ifndef NO_UDOM_SUPPORT
301
302static int
303udom_open(const char *path, int flags)
304{
305	struct sockaddr_un sou;
306	int fd;
307	unsigned int len;
308
309	bzero(&sou, sizeof(sou));
310
311	/*
312	 * Construct the unix domain socket address and attempt to connect
313	 */
314	fd = socket(AF_UNIX, SOCK_STREAM, 0);
315	if (fd >= 0) {
316		sou.sun_family = AF_UNIX;
317		if ((len = strlcpy(sou.sun_path, path,
318		    sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
319			errno = ENAMETOOLONG;
320			return (-1);
321		}
322		len = offsetof(struct sockaddr_un, sun_path[len+1]);
323
324		if (connect(fd, (void *)&sou, len) < 0) {
325			close(fd);
326			fd = -1;
327		}
328	}
329
330	/*
331	 * handle the open flags by shutting down appropriate directions
332	 */
333	if (fd >= 0) {
334		switch(flags & O_ACCMODE) {
335		case O_RDONLY:
336			if (shutdown(fd, SHUT_WR) == -1)
337				warn(NULL);
338			break;
339		case O_WRONLY:
340			if (shutdown(fd, SHUT_RD) == -1)
341				warn(NULL);
342			break;
343		default:
344			break;
345		}
346	}
347	return (fd);
348}
349
350#endif
351