1/* $NetBSD: cat.c,v 1.43 2004/01/04 03:31:28 jschauma Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kevin Fall.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/param.h>
36#include <sys/stat.h>
37
38#include <ctype.h>
39#include <errno.h>
40#include <fcntl.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#define CAT_BUFSIZ (4096)
47
48static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
49static int rval;
50static const char *filename;
51
52static void
53cook_buf(FILE *fp)
54{
55	int ch, gobble, line, prev;
56	int stdout_err = 0;
57
58	line = gobble = 0;
59	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
60		if (prev == '\n') {
61			if (ch == '\n') {
62				if (sflag) {
63					if (!gobble && putchar(ch) == EOF)
64						break;
65					gobble = 1;
66					continue;
67				}
68				if (nflag) {
69					if (!bflag) {
70						if (fprintf(stdout,
71						    "%6d\t", ++line) < 0) {
72							stdout_err++;
73							break;
74						}
75					} else if (eflag) {
76						if (fprintf(stdout,
77						    "%6s\t", "") < 0) {
78							stdout_err++;
79							break;
80						}
81					}
82				}
83			} else if (nflag) {
84				if (fprintf(stdout, "%6d\t", ++line) < 0) {
85					stdout_err++;
86					break;
87				}
88			}
89		}
90		gobble = 0;
91		if (ch == '\n') {
92			if (eflag)
93				if (putchar('$') == EOF)
94					break;
95		} else if (ch == '\t') {
96			if (tflag) {
97				if (putchar('^') == EOF || putchar('I') == EOF)
98					break;
99				continue;
100			}
101		} else if (vflag) {
102			if (!isascii(ch)) {
103				if (putchar('M') == EOF || putchar('-') == EOF)
104					break;
105				ch = (ch) & 0x7f;
106			}
107			if (iscntrl(ch)) {
108				if (putchar('^') == EOF ||
109				    putchar(ch == '\177' ? '?' :
110				    ch | 0100) == EOF)
111					break;
112				continue;
113			}
114		}
115		if (putchar(ch) == EOF)
116			break;
117	}
118	if (stdout_err) {
119		perror(filename);
120		rval = 1;
121	}
122}
123
124static void
125cook_args(char **argv)
126{
127	FILE *fp;
128
129	fp = stdin;
130	filename = "stdin";
131	do {
132		if (*argv) {
133			if (!strcmp(*argv, "-"))
134				fp = stdin;
135			else if ((fp = fopen(*argv,
136			    fflag ? "rf" : "r")) == NULL) {
137				perror("fopen");
138				rval = 1;
139				++argv;
140				continue;
141			}
142			filename = *argv++;
143		}
144		cook_buf(fp);
145		if (fp != stdin)
146			fclose(fp);
147	} while (*argv);
148}
149
150static void
151raw_cat(int rfd)
152{
153	static char *buf;
154	static char fb_buf[CAT_BUFSIZ];
155	static size_t bsize;
156
157	struct stat sbuf;
158	ssize_t nr, nw, off;
159	int wfd;
160
161	wfd = fileno(stdout);
162	if (buf == NULL) {
163		if (fstat(wfd, &sbuf) == 0) {
164			bsize = sbuf.st_blksize > CAT_BUFSIZ ?
165			    sbuf.st_blksize : CAT_BUFSIZ;
166			buf = malloc(bsize);
167		}
168		if (buf == NULL) {
169			buf = fb_buf;
170			bsize = CAT_BUFSIZ;
171		}
172	}
173	while ((nr = read(rfd, buf, bsize)) > 0)
174		for (off = 0; nr; nr -= nw, off += nw)
175			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
176			{
177				perror("write");
178				exit(EXIT_FAILURE);
179			}
180	if (nr < 0) {
181		fprintf(stderr,"%s: invalid length\n", filename);
182		rval = 1;
183	}
184}
185
186static void
187raw_args(char **argv)
188{
189	int fd;
190
191	fd = fileno(stdin);
192	filename = "stdin";
193	do {
194		if (*argv) {
195			if (!strcmp(*argv, "-"))
196				fd = fileno(stdin);
197			else if (fflag) {
198				struct stat st;
199				fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
200				if (fd < 0)
201					goto skip;
202
203				if (fstat(fd, &st) == -1) {
204					close(fd);
205					goto skip;
206				}
207				if (!S_ISREG(st.st_mode)) {
208					close(fd);
209					errno = EINVAL;
210					goto skipnomsg;
211				}
212			}
213			else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
214skip:
215				perror(*argv);
216skipnomsg:
217				rval = 1;
218				++argv;
219				continue;
220			}
221			filename = *argv++;
222		}
223		raw_cat(fd);
224		if (fd != fileno(stdin))
225			close(fd);
226	} while (*argv);
227}
228
229int
230cat_main(int argc, char *argv[])
231{
232	int ch;
233	struct flock stdout_lock;
234
235	while ((ch = getopt(argc, argv, "beflnstv")) != -1)
236		switch (ch) {
237		case 'b':
238			bflag = nflag = 1;	/* -b implies -n */
239			break;
240		case 'e':
241			eflag = vflag = 1;	/* -e implies -v */
242			break;
243		case 'f':
244			fflag = 1;
245			break;
246		case 'l':
247			lflag = 1;
248			break;
249		case 'n':
250			nflag = 1;
251			break;
252		case 's':
253			sflag = 1;
254			break;
255		case 't':
256			tflag = vflag = 1;	/* -t implies -v */
257			break;
258		case 'v':
259			vflag = 1;
260			break;
261		default:
262		case '?':
263			fprintf(stderr,
264				"usage: cat [-beflnstv] [-] [file ...]\n");
265			exit(EXIT_FAILURE);
266		}
267	argv += optind;
268
269	if (lflag) {
270		stdout_lock.l_len = 0;
271		stdout_lock.l_start = 0;
272		stdout_lock.l_type = F_WRLCK;
273		stdout_lock.l_whence = SEEK_SET;
274		if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
275		{
276			perror("fcntl");
277			exit(EXIT_FAILURE);
278		}
279	}
280
281	if (bflag || eflag || nflag || sflag || tflag || vflag)
282		cook_args(argv);
283	else
284		raw_args(argv);
285	if (fclose(stdout))
286	{
287		perror("fclose");
288		exit(EXIT_FAILURE);
289	}
290	exit(rval);
291}
292