1/* $NetBSD: cat.c,v 1.54 2013/12/08 08:32:13 spz 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#if HAVE_NBTOOL_CONFIG_H
36#include "nbtool_config.h"
37#endif
38
39#include <sys/cdefs.h>
40#if !defined(lint)
41__COPYRIGHT(
42"@(#) Copyright (c) 1989, 1993\
43 The Regents of the University of California.  All rights reserved.");
44#if 0
45static char sccsid[] = "@(#)cat.c	8.2 (Berkeley) 4/27/95";
46#else
47__RCSID("$NetBSD: cat.c,v 1.54 2013/12/08 08:32:13 spz Exp $");
48#endif
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/stat.h>
53
54#include <ctype.h>
55#include <err.h>
56#include <errno.h>
57#include <fcntl.h>
58#include <locale.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
65static size_t bsize;
66static int rval;
67static const char *filename;
68
69void cook_args(char *argv[]);
70void cook_buf(FILE *);
71void raw_args(char *argv[]);
72void raw_cat(int);
73
74int
75main(int argc, char *argv[])
76{
77	int ch;
78	struct flock stdout_lock;
79
80	setprogname(argv[0]);
81	(void)setlocale(LC_ALL, "");
82
83	while ((ch = getopt(argc, argv, "B:beflnstuv")) != -1)
84		switch (ch) {
85		case 'B':
86			bsize = (size_t)strtol(optarg, NULL, 0);
87			break;
88		case 'b':
89			bflag = nflag = 1;	/* -b implies -n */
90			break;
91		case 'e':
92			eflag = vflag = 1;	/* -e implies -v */
93			break;
94		case 'f':
95			fflag = 1;
96			break;
97		case 'l':
98			lflag = 1;
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		case '?':
117			(void)fprintf(stderr,
118			    "Usage: %s [-beflnstuv] [-B bsize] [-] "
119			    "[file ...]\n", getprogname());
120			return EXIT_FAILURE;
121		}
122	argv += optind;
123
124	if (lflag) {
125		stdout_lock.l_len = 0;
126		stdout_lock.l_start = 0;
127		stdout_lock.l_type = F_WRLCK;
128		stdout_lock.l_whence = SEEK_SET;
129		if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
130			err(EXIT_FAILURE, "stdout");
131	}
132
133	if (bflag || eflag || nflag || sflag || tflag || vflag)
134		cook_args(argv);
135	else
136		raw_args(argv);
137	if (fclose(stdout))
138		err(EXIT_FAILURE, "stdout");
139	return rval;
140}
141
142void
143cook_args(char **argv)
144{
145	FILE *fp;
146
147	fp = stdin;
148	filename = "stdin";
149	do {
150		if (*argv) {
151			if (!strcmp(*argv, "-"))
152				fp = stdin;
153			else if ((fp = fopen(*argv,
154			    fflag ? "rf" : "r")) == NULL) {
155				warn("%s", *argv);
156				rval = EXIT_FAILURE;
157				++argv;
158				continue;
159			}
160			filename = *argv++;
161		}
162		cook_buf(fp);
163		if (fp != stdin)
164			(void)fclose(fp);
165		else
166			clearerr(fp);
167	} while (*argv);
168}
169
170void
171cook_buf(FILE *fp)
172{
173	int ch, gobble, line, prev;
174
175	line = gobble = 0;
176	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
177		if (prev == '\n') {
178			if (ch == '\n') {
179				if (sflag) {
180					if (!gobble && nflag && !bflag)
181						(void)fprintf(stdout,
182							"%6d\t\n", ++line);
183					else if (!gobble && putchar(ch) == EOF)
184						break;
185					gobble = 1;
186					continue;
187				}
188				if (nflag) {
189					if (!bflag) {
190						(void)fprintf(stdout,
191						    "%6d\t", ++line);
192						if (ferror(stdout))
193							break;
194					} else if (eflag) {
195						(void)fprintf(stdout,
196						    "%6s\t", "");
197						if (ferror(stdout))
198							break;
199					}
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)) {
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 = EXIT_FAILURE;
238		clearerr(fp);
239	}
240	if (ferror(stdout))
241		err(EXIT_FAILURE, "stdout");
242}
243
244void
245raw_args(char **argv)
246{
247	int fd;
248
249	fd = fileno(stdin);
250	filename = "stdin";
251	do {
252		if (*argv) {
253			if (!strcmp(*argv, "-")) {
254				fd = fileno(stdin);
255				if (fd < 0)
256					goto skip;
257			} else if (fflag) {
258				struct stat st;
259				fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
260				if (fd < 0)
261					goto skip;
262
263				if (fstat(fd, &st) == -1) {
264					close(fd);
265					goto skip;
266				}
267				if (!S_ISREG(st.st_mode)) {
268					close(fd);
269					warnx("%s: not a regular file", *argv);
270					goto skipnomsg;
271				}
272			}
273			else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
274skip:
275				warn("%s", *argv);
276skipnomsg:
277				rval = EXIT_FAILURE;
278				++argv;
279				continue;
280			}
281			filename = *argv++;
282		} else if (fd < 0) {
283			err(EXIT_FAILURE, "stdin");
284		}
285		raw_cat(fd);
286		if (fd != fileno(stdin))
287			(void)close(fd);
288	} while (*argv);
289}
290
291void
292raw_cat(int rfd)
293{
294	static char *buf;
295	static char fb_buf[BUFSIZ];
296
297	ssize_t nr, nw, off;
298	int wfd;
299
300	wfd = fileno(stdout);
301	if (wfd < 0)
302		err(EXIT_FAILURE, "stdout");
303	if (buf == NULL) {
304		struct stat sbuf;
305
306		if (bsize == 0) {
307			if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 &&
308			    (size_t)sbuf.st_blksize > sizeof(fb_buf))
309				bsize = sbuf.st_blksize;
310		}
311		if (bsize > sizeof(fb_buf)) {
312			buf = malloc(bsize);
313			if (buf == NULL)
314				warnx("malloc, using %zu buffer", bsize);
315		}
316		if (buf == NULL) {
317			bsize = sizeof(fb_buf);
318			buf = fb_buf;
319		}
320	}
321	while ((nr = read(rfd, buf, bsize)) > 0)
322		for (off = 0; nr; nr -= nw, off += nw)
323			if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
324				err(EXIT_FAILURE, "stdout");
325	if (nr < 0) {
326		warn("%s", filename);
327		rval = EXIT_FAILURE;
328	}
329}
330