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1 /*-
2  * Copyright (c) 1989, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Kevin Fall.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 #if 0
34 #ifndef lint
35 static char const copyright[] =
36 "@(#) Copyright (c) 1989, 1993\n\
37         The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 #endif
40
41 #ifndef lint
42 #if 0
43 static char sccsid[] = "@(#)cat.c       8.2 (Berkeley) 4/27/95";
44 #endif
45 #endif /* not lint */
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48
49 #include <sys/param.h>
50 #include <sys/stat.h>
51 #ifndef NO_UDOM_SUPPORT
52 #include <sys/socket.h>
53 #include <sys/un.h>
54 #include <errno.h>
55 #endif
56
57 #include <ctype.h>
58 #include <err.h>
59 #include <fcntl.h>
60 #include <locale.h>
61 #include <stddef.h>
62 #include <stdio.h>
63 #include <stdlib.h>
64 #include <string.h>
65 #include <unistd.h>
66
67 static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
68 static int rval;
69 static const char *filename;
70
71 static void usage(void);
72 static void scanfiles(char *argv[], int cooked);
73 static void cook_cat(FILE *);
74 static void raw_cat(int);
75
76 #ifndef NO_UDOM_SUPPORT
77 static int udom_open(const char *path, int flags);
78 #endif
79
80 /*
81  * Memory strategy threshold, in pages: if physmem is larger than this,
82  * use a large buffer.
83  */
84 #define PHYSPAGES_THRESHOLD (32 * 1024)
85
86 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */
87 #define BUFSIZE_MAX (2 * 1024 * 1024)
88
89 /*
90  * Small (default) buffer size in bytes. It's inefficient for this to be
91  * smaller than MAXPHYS.
92  */
93 #define BUFSIZE_SMALL (MAXPHYS)
94
95 int
96 main(int argc, char *argv[])
97 {
98         int ch;
99         struct flock stdout_lock;
100
101         setlocale(LC_CTYPE, "");
102
103         while ((ch = getopt(argc, argv, "belnstuv")) != -1)
104                 switch (ch) {
105                 case 'b':
106                         bflag = nflag = 1;      /* -b implies -n */
107                         break;
108                 case 'e':
109                         eflag = vflag = 1;      /* -e implies -v */
110                         break;
111                 case 'l':
112                         lflag = 1;
113                         break;
114                 case 'n':
115                         nflag = 1;
116                         break;
117                 case 's':
118                         sflag = 1;
119                         break;
120                 case 't':
121                         tflag = vflag = 1;      /* -t implies -v */
122                         break;
123                 case 'u':
124                         setbuf(stdout, NULL);
125                         break;
126                 case 'v':
127                         vflag = 1;
128                         break;
129                 default:
130                         usage();
131                 }
132         argv += optind;
133
134         if (lflag) {
135                 stdout_lock.l_len = 0;
136                 stdout_lock.l_start = 0;
137                 stdout_lock.l_type = F_WRLCK;
138                 stdout_lock.l_whence = SEEK_SET;
139                 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
140                         err(EXIT_FAILURE, "stdout");
141         }
142
143         if (bflag || eflag || nflag || sflag || tflag || vflag)
144                 scanfiles(argv, 1);
145         else
146                 scanfiles(argv, 0);
147         if (fclose(stdout))
148                 err(1, "stdout");
149         exit(rval);
150         /* NOTREACHED */
151 }
152
153 static void
154 usage(void)
155 {
156         fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n");
157         exit(1);
158         /* NOTREACHED */
159 }
160
161 static void
162 scanfiles(char *argv[], int cooked)
163 {
164         int fd, i;
165         char *path;
166         FILE *fp;
167
168         i = 0;
169         while ((path = argv[i]) != NULL || i == 0) {
170                 if (path == NULL || strcmp(path, "-") == 0) {
171                         filename = "stdin";
172                         fd = STDIN_FILENO;
173                 } else {
174                         filename = path;
175                         fd = open(path, O_RDONLY);
176 #ifndef NO_UDOM_SUPPORT
177                         if (fd < 0 && errno == EOPNOTSUPP)
178                                 fd = udom_open(path, O_RDONLY);
179 #endif
180                 }
181                 if (fd < 0) {
182                         warn("%s", path);
183                         rval = 1;
184                 } else if (cooked) {
185                         if (fd == STDIN_FILENO)
186                                 cook_cat(stdin);
187                         else {
188                                 fp = fdopen(fd, "r");
189                                 cook_cat(fp);
190                                 fclose(fp);
191                         }
192                 } else {
193                         raw_cat(fd);
194                         if (fd != STDIN_FILENO)
195                                 close(fd);
196                 }
197                 if (path == NULL)
198                         break;
199                 ++i;
200         }
201 }
202
203 static void
204 cook_cat(FILE *fp)
205 {
206         int ch, gobble, line, prev;
207
208         /* Reset EOF condition on stdin. */
209         if (fp == stdin && feof(stdin))
210                 clearerr(stdin);
211
212         line = gobble = 0;
213         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
214                 if (prev == '\n') {
215                         if (sflag) {
216                                 if (ch == '\n') {
217                                         if (gobble)
218                                                 continue;
219                                         gobble = 1;
220                                 } else
221                                         gobble = 0;
222                         }
223                         if (nflag && (!bflag || ch != '\n')) {
224                                 (void)fprintf(stdout, "%6d\t", ++line);
225                                 if (ferror(stdout))
226                                         break;
227                         }
228                 }
229                 if (ch == '\n') {
230                         if (eflag && putchar('$') == EOF)
231                                 break;
232                 } else if (ch == '\t') {
233                         if (tflag) {
234                                 if (putchar('^') == EOF || putchar('I') == EOF)
235                                         break;
236                                 continue;
237                         }
238                 } else if (vflag) {
239                         if (!isascii(ch) && !isprint(ch)) {
240                                 if (putchar('M') == EOF || putchar('-') == EOF)
241                                         break;
242                                 ch = toascii(ch);
243                         }
244                         if (iscntrl(ch)) {
245                                 if (putchar('^') == EOF ||
246                                     putchar(ch == '\177' ? '?' :
247                                     ch | 0100) == EOF)
248                                         break;
249                                 continue;
250                         }
251                 }
252                 if (putchar(ch) == EOF)
253                         break;
254         }
255         if (ferror(fp)) {
256                 warn("%s", filename);
257                 rval = 1;
258                 clearerr(fp);
259         }
260         if (ferror(stdout))
261                 err(1, "stdout");
262 }
263
264 static void
265 raw_cat(int rfd)
266 {
267         int off, wfd;
268         ssize_t nr, nw;
269         static size_t bsize;
270         static char *buf = NULL;
271         struct stat sbuf;
272
273         wfd = fileno(stdout);
274         if (buf == NULL) {
275                 if (fstat(wfd, &sbuf))
276                         err(1, "stdout");
277                 if (S_ISREG(sbuf.st_mode)) {
278                         /* If there's plenty of RAM, use a large copy buffer */
279                         if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
280                                 bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
281                         else
282                                 bsize = BUFSIZE_SMALL;
283                 } else
284                         bsize = MAX(sbuf.st_blksize,
285                             (blksize_t)sysconf(_SC_PAGESIZE));
286                 if ((buf = malloc(bsize)) == NULL)
287                         err(1, "malloc() failure of IO buffer");
288         }
289         while ((nr = read(rfd, buf, bsize)) > 0)
290                 for (off = 0; nr; nr -= nw, off += nw)
291                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
292                                 err(1, "stdout");
293         if (nr < 0) {
294                 warn("%s", filename);
295                 rval = 1;
296         }
297 }
298
299 #ifndef NO_UDOM_SUPPORT
300
301 static int
302 udom_open(const char *path, int flags)
303 {
304         struct sockaddr_un sou;
305         int fd;
306         unsigned int len;
307
308         bzero(&sou, sizeof(sou));
309
310         /*
311          * Construct the unix domain socket address and attempt to connect
312          */
313         fd = socket(AF_UNIX, SOCK_STREAM, 0);
314         if (fd >= 0) {
315                 sou.sun_family = AF_UNIX;
316                 if ((len = strlcpy(sou.sun_path, path,
317                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
318                         errno = ENAMETOOLONG;
319                         return (-1);
320                 }
321                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
322
323                 if (connect(fd, (void *)&sou, len) < 0) {
324                         close(fd);
325                         fd = -1;
326                 }
327         }
328
329         /*
330          * handle the open flags by shutting down appropriate directions
331          */
332         if (fd >= 0) {
333                 switch(flags & O_ACCMODE) {
334                 case O_RDONLY:
335                         if (shutdown(fd, SHUT_WR) == -1)
336                                 warn(NULL);
337                         break;
338                 case O_WRONLY:
339                         if (shutdown(fd, SHUT_RD) == -1)
340                                 warn(NULL);
341                         break;
342                 default:
343                         break;
344                 }
345         }
346         return (fd);
347 }
348
349 #endif