1/* $NetBSD: cat.c,v 1.57 2016/06/16 00:52:37 sevan 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 1.57 2016/06/16 00:52:37 sevan 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 (sflag) {
179 if (ch == '\n') {
180 if (gobble)
181 continue;
182 gobble = 1;
183 } else
184 gobble = 0;
185 }
186 if (nflag) {
187 if (!bflag || ch != '\n') {
188 (void)fprintf(stdout,
189 "%6d\t", ++line);
190 if (ferror(stdout))
191 break;
192 } else if (eflag) {
193 (void)fprintf(stdout,
194 "%6s\t", "");
195 if (ferror(stdout))
196 break;
197 }
198 }
199 }
200 if (ch == '\n') {
201 if (eflag)
202 if (putchar('$') == EOF)
203 break;
204 } else if (ch == '\t') {
205 if (tflag) {
206 if (putchar('^') == EOF || putchar('I') == EOF)
207 break;
208 continue;
209 }
210 } else if (vflag) {
211 if (!isascii(ch)) {
212 if (putchar('M') == EOF || putchar('-') == EOF)
213 break;
214 ch = toascii(ch);
215 }
216 if (iscntrl(ch)) {
217 if (putchar('^') == EOF ||
218 putchar(ch == '\177' ? '?' :
219 ch | 0100) == EOF)
220 break;
221 continue;
222 }
223 }
224 if (putchar(ch) == EOF)
225 break;
226 }
227 if (ferror(fp)) {
228 warn("%s", filename);
229 rval = EXIT_FAILURE;
230 clearerr(fp);
231 }
232 if (ferror(stdout))
233 err(EXIT_FAILURE, "stdout");
234}
235
236void
237raw_args(char **argv)
238{
239 int fd;
240
241 fd = fileno(stdin);
242 filename = "stdin";
243 do {
244 if (*argv) {
245 if (!strcmp(*argv, "-")) {
246 fd = fileno(stdin);
247 if (fd < 0)
248 goto skip;
249 } else if (fflag) {
250 struct stat st;
251 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
252 if (fd < 0)
253 goto skip;
254
255 if (fstat(fd, &st) == -1) {
256 close(fd);
257 goto skip;
258 }
259 if (!S_ISREG(st.st_mode)) {
260 close(fd);
261 warnx("%s: not a regular file", *argv);
262 goto skipnomsg;
263 }
264 }
265 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
266skip:
267 warn("%s", *argv);
268skipnomsg:
269 rval = EXIT_FAILURE;
270 ++argv;
271 continue;
272 }
273 filename = *argv++;
274 } else if (fd < 0) {
275 err(EXIT_FAILURE, "stdin");
276 }
277 raw_cat(fd);
278 if (fd != fileno(stdin))
279 (void)close(fd);
280 } while (*argv);
281}
282
283void
284raw_cat(int rfd)
285{
286 static char *buf;
287 static char fb_buf[BUFSIZ];
288
289 ssize_t nr, nw, off;
290 int wfd;
291
292 wfd = fileno(stdout);
293 if (wfd < 0)
294 err(EXIT_FAILURE, "stdout");
295 if (buf == NULL) {
296 struct stat sbuf;
297
298 if (bsize == 0) {
299 if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 &&
300 (size_t)sbuf.st_blksize > sizeof(fb_buf))
301 bsize = sbuf.st_blksize;
302 }
303 if (bsize > sizeof(fb_buf)) {
304 buf = malloc(bsize);
305 if (buf == NULL)
306 warnx("malloc, using %zu buffer", bsize);
307 }
308 if (buf == NULL) {
309 bsize = sizeof(fb_buf);
310 buf = fb_buf;
311 }
312 }
313 while ((nr = read(rfd, buf, bsize)) > 0)
314 for (off = 0; nr; nr -= nw, off += nw)
315 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
316 err(EXIT_FAILURE, "stdout");
317 if (nr < 0) {
318 warn("%s", filename);
319 rval = EXIT_FAILURE;
320 }
321}
322