cat.c revision 83961 
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 83961 2001-09-26 11:32:23Z ru $";
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
73int main __P((int argc, char *argv[]));
74
75static void scanfiles __P((char **argv, int cooked));
76static void cook_cat __P((FILE *));
77static void raw_cat __P((int));
78
79#ifndef NO_UDOM_SUPPORT
80static int udom_open __P((const char *path, int flags, int modes));
81#endif
82
83int
84main(argc, argv)
85	int argc;
86	char *argv[];
87{
88	int ch;
89
90	setlocale(LC_CTYPE, "");
91
92	while ((ch = getopt(argc, argv, "benstuv")) != -1)
93		switch (ch) {
94		case 'b':
95			bflag = nflag = 1;	/* -b implies -n */
96			break;
97		case 'e':
98			eflag = vflag = 1;	/* -e implies -v */
99			break;
100		case 'n':
101			nflag = 1;
102			break;
103		case 's':
104			sflag = 1;
105			break;
106		case 't':
107			tflag = vflag = 1;	/* -t implies -v */
108			break;
109		case 'u':
110			setbuf(stdout, NULL);
111			break;
112		case 'v':
113			vflag = 1;
114			break;
115		default:
116			(void)fprintf(stderr,
117			    "usage: cat [-benstuv] [-] [file ...]\n");
118			exit(1);
119		}
120	argv += optind;
121
122	if (bflag || eflag || nflag || sflag || tflag || vflag)
123		scanfiles(argv, 1);
124	else
125		scanfiles(argv, 0);
126	if (fclose(stdout))
127		err(1, "stdout");
128	exit(rval);
129}
130
131void
132scanfiles(argv, cooked)
133    char **argv;
134    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, 0);
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(fp)
178	register FILE *fp;
179{
180	register int ch, gobble, line, prev;
181
182	/* Reset EOF condition on stdin. */
183	if (fp == stdin && feof(stdin))
184		clearerr(stdin);
185
186	line = gobble = 0;
187	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
188		if (prev == '\n') {
189			if (ch == '\n') {
190				if (sflag) {
191					if (!gobble && putchar(ch) == EOF)
192						break;
193					gobble = 1;
194					continue;
195				}
196				if (nflag && !bflag) {
197					(void)fprintf(stdout, "%6d\t", ++line);
198					if (ferror(stdout))
199						break;
200				}
201			} else if (nflag) {
202				(void)fprintf(stdout, "%6d\t", ++line);
203				if (ferror(stdout))
204					break;
205			}
206		}
207		gobble = 0;
208		if (ch == '\n') {
209			if (eflag)
210				if (putchar('$') == EOF)
211					break;
212		} else if (ch == '\t') {
213			if (tflag) {
214				if (putchar('^') == EOF || putchar('I') == EOF)
215					break;
216				continue;
217			}
218		} else if (vflag) {
219			if (!isascii(ch) && !isprint(ch)) {
220				if (putchar('M') == EOF || putchar('-') == EOF)
221					break;
222				ch = toascii(ch);
223			}
224			if (iscntrl(ch)) {
225				if (putchar('^') == EOF ||
226				    putchar(ch == '\177' ? '?' :
227				    ch | 0100) == EOF)
228					break;
229				continue;
230			}
231		}
232		if (putchar(ch) == EOF)
233			break;
234	}
235	if (ferror(fp)) {
236		warn("%s", filename);
237		rval = 1;
238		clearerr(fp);
239	}
240	if (ferror(stdout))
241		err(1, "stdout");
242}
243
244static void
245raw_cat(rfd)
246	register int rfd;
247{
248	register int off, wfd;
249	ssize_t nr, nw;
250	static size_t bsize;
251	static char *buf;
252	struct stat sbuf;
253
254	wfd = fileno(stdout);
255	if (buf == NULL) {
256		if (fstat(wfd, &sbuf))
257			err(1, "%s", filename);
258		bsize = MAX(sbuf.st_blksize, 1024);
259		if ((buf = malloc(bsize)) == NULL)
260			err(1, "buffer");
261	}
262	while ((nr = read(rfd, buf, bsize)) > 0)
263		for (off = 0; nr; nr -= nw, off += nw)
264			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
265				err(1, "stdout");
266	if (nr < 0) {
267		warn("%s", filename);
268		rval = 1;
269	}
270}
271
272#ifndef NO_UDOM_SUPPORT
273
274static int
275udom_open(path, flags, modes)
276    const char *path;
277    int flags;
278    int modes;
279{
280	struct sockaddr_un sou;
281	int fd;
282	int len;
283
284	bzero(&sou, sizeof(sou));
285
286	/*
287	 * Construct the unix domain socket address and attempt to connect
288	 */
289	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0) {
290		sou.sun_family = AF_UNIX;
291		snprintf(sou.sun_path, sizeof(sou.sun_path), "%s", path);
292		len = strlen(sou.sun_path);
293		len = offsetof(struct sockaddr_un, sun_path[len+1]);
294
295		if (connect(fd, (void *)&sou, len) < 0) {
296			close(fd);
297			fd = -1;
298		}
299	}
300
301	/*
302	 * handle the open flags by shutting down appropriate directions
303	 */
304	if (fd >= 0) {
305		switch(flags & O_ACCMODE) {
306		case O_RDONLY:
307			shutdown(fd, SHUT_WR);
308			break;
309		case O_WRONLY:
310			shutdown(fd, SHUT_RD);
311			break;
312		default:
313			break;
314		}
315	}
316	return(fd);
317}
318
319#endif
320
321