cat.c revision 99022 
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
47static const char rcsid[] =
48  "$FreeBSD: head/bin/cat/cat.c 99022 2002-06-29 04:52:33Z tjr $";
49#endif /* not lint */
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}
125
126static void
127usage(void)
128{
129	fprintf(stderr, "usage: cat [-benstuv] [file ...]\n");
130	exit(1);
131}
132
133void
134scanfiles(char **argv, int cooked)
135{
136	int i = 0;
137	char *path;
138	FILE *fp;
139
140	while ((path = argv[i]) != NULL || i == 0) {
141		int fd;
142
143		if (path == NULL || strcmp(path, "-") == 0) {
144			filename = "stdin";
145			fd = STDIN_FILENO;
146		} else {
147			filename = path;
148			fd = open(path, O_RDONLY);
149#ifndef NO_UDOM_SUPPORT
150			if (fd < 0 && errno == EOPNOTSUPP)
151				fd = udom_open(path, O_RDONLY);
152#endif
153		}
154		if (fd < 0) {
155			warn("%s", path);
156			rval = 1;
157		} else if (cooked) {
158			if (fd == STDIN_FILENO)
159				cook_cat(stdin);
160			else {
161				fp = fdopen(fd, "r");
162				cook_cat(fp);
163				fclose(fp);
164			}
165		} else {
166			raw_cat(fd);
167			if (fd != STDIN_FILENO)
168				close(fd);
169		}
170		if (path == NULL)
171			break;
172		++i;
173	}
174}
175
176static void
177cook_cat(FILE *fp)
178{
179	int ch, gobble, line, prev;
180
181	/* Reset EOF condition on stdin. */
182	if (fp == stdin && feof(stdin))
183		clearerr(stdin);
184
185	line = gobble = 0;
186	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
187		if (prev == '\n') {
188			if (sflag) {
189				if (ch == '\n') {
190					if (gobble)
191						continue;
192					gobble = 1;
193				} else
194					gobble = 0;
195			}
196			if (nflag && (!bflag || ch != '\n')) {
197				(void)fprintf(stdout, "%6d\t", ++line);
198				if (ferror(stdout))
199					break;
200			}
201		}
202		if (ch == '\n') {
203			if (eflag && putchar('$') == EOF)
204				break;
205		} else if (ch == '\t') {
206			if (tflag) {
207				if (putchar('^') == EOF || putchar('I') == EOF)
208					break;
209				continue;
210			}
211		} else if (vflag) {
212			if (!isascii(ch) && !isprint(ch)) {
213				if (putchar('M') == EOF || putchar('-') == EOF)
214					break;
215				ch = toascii(ch);
216			}
217			if (iscntrl(ch)) {
218				if (putchar('^') == EOF ||
219				    putchar(ch == '\177' ? '?' :
220				    ch | 0100) == EOF)
221					break;
222				continue;
223			}
224		}
225		if (putchar(ch) == EOF)
226			break;
227	}
228	if (ferror(fp)) {
229		warn("%s", filename);
230		rval = 1;
231		clearerr(fp);
232	}
233	if (ferror(stdout))
234		err(1, "stdout");
235}
236
237static void
238raw_cat(int rfd)
239{
240	int off, wfd;
241	ssize_t nr, nw;
242	static size_t bsize;
243	static char *buf = NULL;
244	struct stat sbuf;
245
246	wfd = fileno(stdout);
247	if (buf == NULL) {
248		if (fstat(wfd, &sbuf))
249			err(1, "%s", filename);
250		bsize = MAX(sbuf.st_blksize, 1024);
251		if ((buf = malloc(bsize)) == NULL)
252			err(1, "buffer");
253	}
254	while ((nr = read(rfd, buf, bsize)) > 0)
255		for (off = 0; nr; nr -= nw, off += nw)
256			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
257				err(1, "stdout");
258	if (nr < 0) {
259		warn("%s", filename);
260		rval = 1;
261	}
262}
263
264#ifndef NO_UDOM_SUPPORT
265
266static int
267udom_open(const char *path, int flags)
268{
269	struct sockaddr_un sou;
270	int fd;
271	unsigned int len;
272
273	bzero(&sou, sizeof(sou));
274
275	/*
276	 * Construct the unix domain socket address and attempt to connect
277	 */
278	fd = socket(AF_UNIX, SOCK_STREAM, 0);
279	if (fd >= 0) {
280		sou.sun_family = AF_UNIX;
281		if ((len = strlcpy(sou.sun_path, path,
282		    sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
283			errno = ENAMETOOLONG;
284			return (-1);
285		}
286		len = offsetof(struct sockaddr_un, sun_path[len+1]);
287
288		if (connect(fd, (void *)&sou, len) < 0) {
289			close(fd);
290			fd = -1;
291		}
292	}
293
294	/*
295	 * handle the open flags by shutting down appropriate directions
296	 */
297	if (fd >= 0) {
298		switch(flags & O_ACCMODE) {
299		case O_RDONLY:
300			if (shutdown(fd, SHUT_WR) == -1)
301				perror("cat");
302			break;
303		case O_WRONLY:
304			if (shutdown(fd, SHUT_RD) == -1)
305				perror("cat");
306			break;
307		default:
308			break;
309		}
310	}
311	return(fd);
312}
313
314#endif
315