1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 0
36 #ifndef lint
37 static char const copyright[] =
38 "@(#) Copyright (c) 1989, 1993\n\
39 The Regents of the University of California. All rights reserved.\n";
40 #endif /* not lint */
41 #endif
42
43 #ifndef lint
44 #if 0
45 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
46 #endif
47 #endif /* not lint */
48 #include <sys/cdefs.h>
49 __FBSDID("$FreeBSD$");
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 <netdb.h>
57 #endif
58
59 #include <ctype.h>
60 #include <err.h>
61 #include <errno.h>
62 #include <fcntl.h>
63 #include <locale.h>
64 #include <stdio.h>
65 #include <stdlib.h>
66 #include <string.h>
67 #include <unistd.h>
68 #include <wchar.h>
69 #include <wctype.h>
70
71 static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
72 static int rval;
73 static const char *filename;
74
75 static void usage(void) __dead2;
76 static void scanfiles(char *argv[], int cooked);
77 static void cook_cat(FILE *);
78 static void raw_cat(int);
79
80 #ifndef NO_UDOM_SUPPORT
81 static int udom_open(const char *path, int flags);
82 #endif
83
84 /*
85 * Memory strategy threshold, in pages: if physmem is larger than this,
86 * use a large buffer.
87 */
88 #define PHYSPAGES_THRESHOLD (32 * 1024)
89
90 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */
91 #define BUFSIZE_MAX (2 * 1024 * 1024)
92
93 /*
94 * Small (default) buffer size in bytes. It's inefficient for this to be
95 * smaller than MAXPHYS.
96 */
97 #define BUFSIZE_SMALL (MAXPHYS)
98
99 int
main(int argc,char * argv[])100 main(int argc, char *argv[])
101 {
102 int ch;
103 struct flock stdout_lock;
104
105 setlocale(LC_CTYPE, "");
106
107 while ((ch = getopt(argc, argv, "belnstuv")) != -1)
108 switch (ch) {
109 case 'b':
110 bflag = nflag = 1; /* -b implies -n */
111 break;
112 case 'e':
113 eflag = vflag = 1; /* -e implies -v */
114 break;
115 case 'l':
116 lflag = 1;
117 break;
118 case 'n':
119 nflag = 1;
120 break;
121 case 's':
122 sflag = 1;
123 break;
124 case 't':
125 tflag = vflag = 1; /* -t implies -v */
126 break;
127 case 'u':
128 setbuf(stdout, NULL);
129 break;
130 case 'v':
131 vflag = 1;
132 break;
133 default:
134 usage();
135 }
136 argv += optind;
137
138 if (lflag) {
139 stdout_lock.l_len = 0;
140 stdout_lock.l_start = 0;
141 stdout_lock.l_type = F_WRLCK;
142 stdout_lock.l_whence = SEEK_SET;
143 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
144 err(EXIT_FAILURE, "stdout");
145 }
146
147 if (bflag || eflag || nflag || sflag || tflag || vflag)
148 scanfiles(argv, 1);
149 else
150 scanfiles(argv, 0);
151 if (fclose(stdout))
152 err(1, "stdout");
153 exit(rval);
154 /* NOTREACHED */
155 }
156
157 static void
usage(void)158 usage(void)
159 {
160
161 fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n");
162 exit(1);
163 /* NOTREACHED */
164 }
165
166 static void
scanfiles(char * argv[],int cooked)167 scanfiles(char *argv[], int cooked)
168 {
169 int fd, i;
170 char *path;
171 FILE *fp;
172
173 i = 0;
174 fd = -1;
175 while ((path = argv[i]) != NULL || i == 0) {
176 if (path == NULL || strcmp(path, "-") == 0) {
177 filename = "stdin";
178 fd = STDIN_FILENO;
179 } else {
180 filename = path;
181 fd = open(path, O_RDONLY);
182 #ifndef NO_UDOM_SUPPORT
183 if (fd < 0 && errno == EOPNOTSUPP)
184 fd = udom_open(path, O_RDONLY);
185 #endif
186 }
187 if (fd < 0) {
188 warn("%s", path);
189 rval = 1;
190 } else if (cooked) {
191 if (fd == STDIN_FILENO)
192 cook_cat(stdin);
193 else {
194 fp = fdopen(fd, "r");
195 cook_cat(fp);
196 fclose(fp);
197 }
198 } else {
199 raw_cat(fd);
200 if (fd != STDIN_FILENO)
201 close(fd);
202 }
203 if (path == NULL)
204 break;
205 ++i;
206 }
207 }
208
209 static void
cook_cat(FILE * fp)210 cook_cat(FILE *fp)
211 {
212 int ch, gobble, line, prev;
213 wint_t wch;
214
215 /* Reset EOF condition on stdin. */
216 if (fp == stdin && feof(stdin))
217 clearerr(stdin);
218
219 line = gobble = 0;
220 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
221 if (prev == '\n') {
222 if (sflag) {
223 if (ch == '\n') {
224 if (gobble)
225 continue;
226 gobble = 1;
227 } else
228 gobble = 0;
229 }
230 if (nflag) {
231 if (!bflag || ch != '\n') {
232 (void)fprintf(stdout, "%6d\t", ++line);
233 if (ferror(stdout))
234 break;
235 } else if (eflag) {
236 (void)fprintf(stdout, "%6s\t", "");
237 if (ferror(stdout))
238 break;
239 }
240 }
241 }
242 if (ch == '\n') {
243 if (eflag && putchar('$') == EOF)
244 break;
245 } else if (ch == '\t') {
246 if (tflag) {
247 if (putchar('^') == EOF || putchar('I') == EOF)
248 break;
249 continue;
250 }
251 } else if (vflag) {
252 (void)ungetc(ch, fp);
253 /*
254 * Our getwc(3) doesn't change file position
255 * on error.
256 */
257 if ((wch = getwc(fp)) == WEOF) {
258 if (ferror(fp) && errno == EILSEQ) {
259 clearerr(fp);
260 /* Resync attempt. */
261 memset(&fp->_mbstate, 0, sizeof(mbstate_t));
262 if ((ch = getc(fp)) == EOF)
263 break;
264 wch = ch;
265 goto ilseq;
266 } else
267 break;
268 }
269 if (!iswascii(wch) && !iswprint(wch)) {
270 ilseq:
271 if (putchar('M') == EOF || putchar('-') == EOF)
272 break;
273 wch = toascii(wch);
274 }
275 if (iswcntrl(wch)) {
276 ch = toascii(wch);
277 ch = (ch == '\177') ? '?' : (ch | 0100);
278 if (putchar('^') == EOF || putchar(ch) == EOF)
279 break;
280 continue;
281 }
282 if (putwchar(wch) == WEOF)
283 break;
284 ch = -1;
285 continue;
286 }
287 if (putchar(ch) == EOF)
288 break;
289 }
290 if (ferror(fp)) {
291 warn("%s", filename);
292 rval = 1;
293 clearerr(fp);
294 }
295 if (ferror(stdout))
296 err(1, "stdout");
297 }
298
299 static void
raw_cat(int rfd)300 raw_cat(int rfd)
301 {
302 long pagesize;
303 int off, wfd;
304 ssize_t nr, nw;
305 static size_t bsize;
306 static char *buf = NULL;
307 struct stat sbuf;
308
309 wfd = fileno(stdout);
310 if (buf == NULL) {
311 if (fstat(wfd, &sbuf))
312 err(1, "stdout");
313 if (S_ISREG(sbuf.st_mode)) {
314 /* If there's plenty of RAM, use a large copy buffer */
315 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
316 bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
317 else
318 bsize = BUFSIZE_SMALL;
319 } else {
320 bsize = sbuf.st_blksize;
321 pagesize = sysconf(_SC_PAGESIZE);
322 if (pagesize > 0)
323 bsize = MAX(bsize, (size_t)pagesize);
324 }
325 if ((buf = malloc(bsize)) == NULL)
326 err(1, "malloc() failure of IO buffer");
327 }
328 while ((nr = read(rfd, buf, bsize)) > 0)
329 for (off = 0; nr; nr -= nw, off += nw)
330 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
331 err(1, "stdout");
332 if (nr < 0) {
333 warn("%s", filename);
334 rval = 1;
335 }
336 }
337
338 #ifndef NO_UDOM_SUPPORT
339
340 static int
udom_open(const char * path,int flags)341 udom_open(const char *path, int flags)
342 {
343 struct addrinfo hints, *res, *res0;
344 char rpath[PATH_MAX];
345 int fd = -1;
346 int error;
347
348 /*
349 * Construct the unix domain socket address and attempt to connect.
350 */
351 bzero(&hints, sizeof(hints));
352 hints.ai_family = AF_LOCAL;
353 if (realpath(path, rpath) == NULL)
354 return (-1);
355 error = getaddrinfo(rpath, NULL, &hints, &res0);
356 if (error) {
357 warn("%s", gai_strerror(error));
358 errno = EINVAL;
359 return (-1);
360 }
361 for (res = res0; res != NULL; res = res->ai_next) {
362 fd = socket(res->ai_family, res->ai_socktype,
363 res->ai_protocol);
364 if (fd < 0) {
365 freeaddrinfo(res0);
366 return (-1);
367 }
368 error = connect(fd, res->ai_addr, res->ai_addrlen);
369 if (error == 0)
370 break;
371 else {
372 close(fd);
373 fd = -1;
374 }
375 }
376 freeaddrinfo(res0);
377
378 /*
379 * handle the open flags by shutting down appropriate directions
380 */
381 if (fd >= 0) {
382 switch(flags & O_ACCMODE) {
383 case O_RDONLY:
384 if (shutdown(fd, SHUT_WR) == -1)
385 warn(NULL);
386 break;
387 case O_WRONLY:
388 if (shutdown(fd, SHUT_RD) == -1)
389 warn(NULL);
390 break;
391 default:
392 break;
393 }
394 }
395 return (fd);
396 }
397
398 #endif
399