1 /* $NetBSD: cat.c,v 1.58 2023/05/19 05:28:54 rillig 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
45 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
46 #else
47 __RCSID("$NetBSD: cat.c,v 1.58 2023/05/19 05:28:54 rillig 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
64 static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
65 static size_t bsize;
66 static int rval;
67 static const char *filename;
68
69 void cook_args(char *argv[]);
70 void cook_buf(FILE *);
71 void raw_args(char *argv[]);
72 void raw_cat(int);
73
74 int
main(int argc,char * argv[])75 main(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
142 void
cook_args(char ** argv)143 cook_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
170 void
cook_buf(FILE * fp)171 cook_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, "%6d\t", ++line);
189 if (ferror(stdout))
190 break;
191 } else if (eflag) {
192 (void)fprintf(stdout, "%6s\t", "");
193 if (ferror(stdout))
194 break;
195 }
196 }
197 }
198 if (ch == '\n') {
199 if (eflag)
200 if (putchar('$') == EOF)
201 break;
202 } else if (ch == '\t') {
203 if (tflag) {
204 if (putchar('^') == EOF || putchar('I') == EOF)
205 break;
206 continue;
207 }
208 } else if (vflag) {
209 if (!isascii(ch)) {
210 if (putchar('M') == EOF || putchar('-') == EOF)
211 break;
212 ch = toascii(ch);
213 }
214 if (iscntrl(ch)) {
215 if (putchar('^') == EOF ||
216 putchar(ch == '\177' ? '?' :
217 ch | 0100) == EOF)
218 break;
219 continue;
220 }
221 }
222 if (putchar(ch) == EOF)
223 break;
224 }
225 if (ferror(fp)) {
226 warn("%s", filename);
227 rval = EXIT_FAILURE;
228 clearerr(fp);
229 }
230 if (ferror(stdout))
231 err(EXIT_FAILURE, "stdout");
232 }
233
234 void
raw_args(char ** argv)235 raw_args(char **argv)
236 {
237 int fd;
238
239 fd = fileno(stdin);
240 filename = "stdin";
241 do {
242 if (*argv) {
243 if (!strcmp(*argv, "-")) {
244 fd = fileno(stdin);
245 if (fd < 0)
246 goto skip;
247 } else if (fflag) {
248 struct stat st;
249 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
250 if (fd < 0)
251 goto skip;
252
253 if (fstat(fd, &st) == -1) {
254 close(fd);
255 goto skip;
256 }
257 if (!S_ISREG(st.st_mode)) {
258 close(fd);
259 warnx("%s: not a regular file", *argv);
260 goto skipnomsg;
261 }
262 }
263 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
264 skip:
265 warn("%s", *argv);
266 skipnomsg:
267 rval = EXIT_FAILURE;
268 ++argv;
269 continue;
270 }
271 filename = *argv++;
272 } else if (fd < 0) {
273 err(EXIT_FAILURE, "stdin");
274 }
275 raw_cat(fd);
276 if (fd != fileno(stdin))
277 (void)close(fd);
278 } while (*argv);
279 }
280
281 void
raw_cat(int rfd)282 raw_cat(int rfd)
283 {
284 static char *buf;
285 static char fb_buf[BUFSIZ];
286
287 ssize_t nr, nw, off;
288 int wfd;
289
290 wfd = fileno(stdout);
291 if (wfd < 0)
292 err(EXIT_FAILURE, "stdout");
293 if (buf == NULL) {
294 struct stat sbuf;
295
296 if (bsize == 0) {
297 if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 &&
298 (size_t)sbuf.st_blksize > sizeof(fb_buf))
299 bsize = sbuf.st_blksize;
300 }
301 if (bsize > sizeof(fb_buf)) {
302 buf = malloc(bsize);
303 if (buf == NULL)
304 warnx("malloc, using %zu buffer", bsize);
305 }
306 if (buf == NULL) {
307 bsize = sizeof(fb_buf);
308 buf = fb_buf;
309 }
310 }
311 while ((nr = read(rfd, buf, bsize)) > 0)
312 for (off = 0; nr; nr -= nw, off += nw)
313 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
314 err(EXIT_FAILURE, "stdout");
315 if (nr < 0) {
316 warn("%s", filename);
317 rval = EXIT_FAILURE;
318 }
319 }
320