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Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.
[FreeBSD/releng/7.2.git] / bin / cat / cat.c
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 <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65 #include <stddef.h>
66
67 int bflag, eflag, nflag, sflag, tflag, vflag;
68 int rval;
69 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 int
81 main(int argc, char *argv[])
82 {
83         int ch;
84
85         setlocale(LC_CTYPE, "");
86
87         while ((ch = getopt(argc, argv, "benstuv")) != -1)
88                 switch (ch) {
89                 case 'b':
90                         bflag = nflag = 1;      /* -b implies -n */
91                         break;
92                 case 'e':
93                         eflag = vflag = 1;      /* -e implies -v */
94                         break;
95                 case 'n':
96                         nflag = 1;
97                         break;
98                 case 's':
99                         sflag = 1;
100                         break;
101                 case 't':
102                         tflag = vflag = 1;      /* -t implies -v */
103                         break;
104                 case 'u':
105                         setbuf(stdout, NULL);
106                         break;
107                 case 'v':
108                         vflag = 1;
109                         break;
110                 default:
111                         usage();
112                 }
113         argv += optind;
114
115         if (bflag || eflag || nflag || sflag || tflag || vflag)
116                 scanfiles(argv, 1);
117         else
118                 scanfiles(argv, 0);
119         if (fclose(stdout))
120                 err(1, "stdout");
121         exit(rval);
122         /* NOTREACHED */
123 }
124
125 static void
126 usage(void)
127 {
128         fprintf(stderr, "usage: cat [-benstuv] [file ...]\n");
129         exit(1);
130         /* NOTREACHED */
131 }
132
133 static void
134 scanfiles(char *argv[], int cooked)
135 {
136         int i = 0;
137         char *path;
138         FILE *fp;
139
140         while ((path = argv[i]) != NULL || i == 0) {
141                 int fd;
142
143                 if (path == NULL || strcmp(path, "-") == 0) {
144                         filename = "stdin";
145                         fd = STDIN_FILENO;
146                 } else {
147                         filename = path;
148                         fd = open(path, O_RDONLY);
149 #ifndef NO_UDOM_SUPPORT
150                         if (fd < 0 && errno == EOPNOTSUPP)
151                                 fd = udom_open(path, O_RDONLY);
152 #endif
153                 }
154                 if (fd < 0) {
155                         warn("%s", path);
156                         rval = 1;
157                 } else if (cooked) {
158                         if (fd == STDIN_FILENO)
159                                 cook_cat(stdin);
160                         else {
161                                 fp = fdopen(fd, "r");
162                                 cook_cat(fp);
163                                 fclose(fp);
164                         }
165                 } else {
166                         raw_cat(fd);
167                         if (fd != STDIN_FILENO)
168                                 close(fd);
169                 }
170                 if (path == NULL)
171                         break;
172                 ++i;
173         }
174 }
175
176 static void
177 cook_cat(FILE *fp)
178 {
179         int ch, gobble, line, prev;
180
181         /* Reset EOF condition on stdin. */
182         if (fp == stdin && feof(stdin))
183                 clearerr(stdin);
184
185         line = gobble = 0;
186         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
187                 if (prev == '\n') {
188                         if (sflag) {
189                                 if (ch == '\n') {
190                                         if (gobble)
191                                                 continue;
192                                         gobble = 1;
193                                 } else
194                                         gobble = 0;
195                         }
196                         if (nflag && (!bflag || ch != '\n')) {
197                                 (void)fprintf(stdout, "%6d\t", ++line);
198                                 if (ferror(stdout))
199                                         break;
200                         }
201                 }
202                 if (ch == '\n') {
203                         if (eflag && putchar('$') == EOF)
204                                 break;
205                 } else if (ch == '\t') {
206                         if (tflag) {
207                                 if (putchar('^') == EOF || putchar('I') == EOF)
208                                         break;
209                                 continue;
210                         }
211                 } else if (vflag) {
212                         if (!isascii(ch) && !isprint(ch)) {
213                                 if (putchar('M') == EOF || putchar('-') == EOF)
214                                         break;
215                                 ch = toascii(ch);
216                         }
217                         if (iscntrl(ch)) {
218                                 if (putchar('^') == EOF ||
219                                     putchar(ch == '\177' ? '?' :
220                                     ch | 0100) == EOF)
221                                         break;
222                                 continue;
223                         }
224                 }
225                 if (putchar(ch) == EOF)
226                         break;
227         }
228         if (ferror(fp)) {
229                 warn("%s", filename);
230                 rval = 1;
231                 clearerr(fp);
232         }
233         if (ferror(stdout))
234                 err(1, "stdout");
235 }
236
237 static void
238 raw_cat(int rfd)
239 {
240         int off, wfd;
241         ssize_t nr, nw;
242         static size_t bsize;
243         static char *buf = NULL;
244         struct stat sbuf;
245
246         wfd = fileno(stdout);
247         if (buf == NULL) {
248                 if (fstat(wfd, &sbuf))
249                         err(1, "%s", filename);
250                 bsize = MAX(sbuf.st_blksize, 1024);
251                 if ((buf = malloc(bsize)) == NULL)
252                         err(1, "buffer");
253         }
254         while ((nr = read(rfd, buf, bsize)) > 0)
255                 for (off = 0; nr; nr -= nw, off += nw)
256                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
257                                 err(1, "stdout");
258         if (nr < 0) {
259                 warn("%s", filename);
260                 rval = 1;
261         }
262 }
263
264 #ifndef NO_UDOM_SUPPORT
265
266 static int
267 udom_open(const char *path, int flags)
268 {
269         struct sockaddr_un sou;
270         int fd;
271         unsigned int len;
272
273         bzero(&sou, sizeof(sou));
274
275         /*
276          * Construct the unix domain socket address and attempt to connect
277          */
278         fd = socket(AF_UNIX, SOCK_STREAM, 0);
279         if (fd >= 0) {
280                 sou.sun_family = AF_UNIX;
281                 if ((len = strlcpy(sou.sun_path, path,
282                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
283                         errno = ENAMETOOLONG;
284                         return (-1);
285                 }
286                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
287
288                 if (connect(fd, (void *)&sou, len) < 0) {
289                         close(fd);
290                         fd = -1;
291                 }
292         }
293
294         /*
295          * handle the open flags by shutting down appropriate directions
296          */
297         if (fd >= 0) {
298                 switch(flags & O_ACCMODE) {
299                 case O_RDONLY:
300                         if (shutdown(fd, SHUT_WR) == -1)
301                                 warn(NULL);
302                         break;
303                 case O_WRONLY:
304                         if (shutdown(fd, SHUT_RD) == -1)
305                                 warn(NULL);
306                         break;
307                 default:
308                         break;
309                 }
310         }
311         return(fd);
312 }
313
314 #endif