cat.c revision 98169 
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 98169 2002-06-13 14:05:26Z 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 scanfiles(char **argv, int cooked);
74static void cook_cat(FILE *);
75static void raw_cat(int);
76
77#ifndef NO_UDOM_SUPPORT
78static int udom_open(const char *path, int flags);
79#endif
80
81int
82main(int argc, char *argv[])
83{
84	int ch;
85
86	setlocale(LC_CTYPE, "");
87
88	while ((ch = getopt(argc, argv, "benstuv")) != -1)
89		switch (ch) {
90		case 'b':
91			bflag = nflag = 1;	/* -b implies -n */
92			break;
93		case 'e':
94			eflag = vflag = 1;	/* -e implies -v */
95			break;
96		case 'n':
97			nflag = 1;
98			break;
99		case 's':
100			sflag = 1;
101			break;
102		case 't':
103			tflag = vflag = 1;	/* -t implies -v */
104			break;
105		case 'u':
106			setbuf(stdout, NULL);
107			break;
108		case 'v':
109			vflag = 1;
110			break;
111		default:
112			fprintf(stderr,
113			    "usage: cat [-benstuv] [file ...]\n");
114			exit(1);
115		}
116	argv += optind;
117
118	if (bflag || eflag || nflag || sflag || tflag || vflag)
119		scanfiles(argv, 1);
120	else
121		scanfiles(argv, 0);
122	if (fclose(stdout))
123		err(1, "stdout");
124	exit(rval);
125}
126
127void
128scanfiles(char **argv, int cooked)
129{
130	int i = 0;
131	char *path;
132	FILE *fp;
133
134	while ((path = argv[i]) != NULL || i == 0) {
135		int fd;
136
137		if (path == NULL || strcmp(path, "-") == 0) {
138			filename = "stdin";
139			fd = STDIN_FILENO;
140		} else {
141			filename = path;
142			fd = open(path, O_RDONLY);
143#ifndef NO_UDOM_SUPPORT
144			if (fd < 0 && errno == EOPNOTSUPP)
145				fd = udom_open(path, O_RDONLY);
146#endif
147		}
148		if (fd < 0) {
149			warn("%s", path);
150			rval = 1;
151		} else if (cooked) {
152			if (fd == STDIN_FILENO)
153				cook_cat(stdin);
154			else {
155				fp = fdopen(fd, "r");
156				cook_cat(fp);
157				fclose(fp);
158			}
159		} else {
160			raw_cat(fd);
161			if (fd != STDIN_FILENO)
162				close(fd);
163		}
164		if (path == NULL)
165			break;
166		++i;
167	}
168}
169
170static void
171cook_cat(FILE *fp)
172{
173	int ch, gobble, line, prev;
174
175	/* Reset EOF condition on stdin. */
176	if (fp == stdin && feof(stdin))
177		clearerr(stdin);
178
179	line = gobble = 0;
180	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
181		if (prev == '\n') {
182			if (sflag) {
183				if (ch == '\n') {
184					if (gobble)
185						continue;
186					gobble = 1;
187				} else
188					gobble = 0;
189			}
190			if (nflag && (!bflag || ch != '\n')) {
191				(void)fprintf(stdout, "%6d\t", ++line);
192				if (ferror(stdout))
193					break;
194			}
195		}
196		if (ch == '\n') {
197			if (eflag && putchar('$') == EOF)
198				break;
199		} else if (ch == '\t') {
200			if (tflag) {
201				if (putchar('^') == EOF || putchar('I') == EOF)
202					break;
203				continue;
204			}
205		} else if (vflag) {
206			if (!isascii(ch) && !isprint(ch)) {
207				if (putchar('M') == EOF || putchar('-') == EOF)
208					break;
209				ch = toascii(ch);
210			}
211			if (iscntrl(ch)) {
212				if (putchar('^') == EOF ||
213				    putchar(ch == '\177' ? '?' :
214				    ch | 0100) == EOF)
215					break;
216				continue;
217			}
218		}
219		if (putchar(ch) == EOF)
220			break;
221	}
222	if (ferror(fp)) {
223		warn("%s", filename);
224		rval = 1;
225		clearerr(fp);
226	}
227	if (ferror(stdout))
228		err(1, "stdout");
229}
230
231static void
232raw_cat(int rfd)
233{
234	int off, wfd;
235	ssize_t nr, nw;
236	static size_t bsize;
237	static char *buf = NULL;
238	struct stat sbuf;
239
240	wfd = fileno(stdout);
241	if (buf == NULL) {
242		if (fstat(wfd, &sbuf))
243			err(1, "%s", filename);
244		bsize = MAX(sbuf.st_blksize, 1024);
245		if ((buf = malloc(bsize)) == NULL)
246			err(1, "buffer");
247	}
248	while ((nr = read(rfd, buf, bsize)) > 0)
249		for (off = 0; nr; nr -= nw, off += nw)
250			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
251				err(1, "stdout");
252	if (nr < 0) {
253		warn("%s", filename);
254		rval = 1;
255	}
256}
257
258#ifndef NO_UDOM_SUPPORT
259
260static int
261udom_open(const char *path, int flags)
262{
263	struct sockaddr_un sou;
264	int fd;
265	unsigned int len;
266
267	bzero(&sou, sizeof(sou));
268
269	/*
270	 * Construct the unix domain socket address and attempt to connect
271	 */
272	fd = socket(AF_UNIX, SOCK_STREAM, 0);
273	if (fd >= 0) {
274		sou.sun_family = AF_UNIX;
275		snprintf(sou.sun_path, sizeof(sou.sun_path), "%s", path);
276		len = strlen(sou.sun_path);
277		len = offsetof(struct sockaddr_un, sun_path[len+1]);
278
279		if (connect(fd, (void *)&sou, len) < 0) {
280			close(fd);
281			fd = -1;
282		}
283	}
284
285	/*
286	 * handle the open flags by shutting down appropriate directions
287	 */
288	if (fd >= 0) {
289		switch(flags & O_ACCMODE) {
290		case O_RDONLY:
291			if (shutdown(fd, SHUT_WR) == -1)
292				perror("cat");
293			break;
294		case O_WRONLY:
295			if (shutdown(fd, SHUT_RD) == -1)
296				perror("cat");
297			break;
298		default:
299			break;
300		}
301	}
302	return(fd);
303}
304
305#endif
306