Merge from vendor branch CVS:
[dragonfly.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  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *      This product includes software developed by the University of
19  *      California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
37  * @(#)cat.c    8.2 (Berkeley) 4/27/95
38  * $FreeBSD: src/bin/cat/cat.c,v 1.14.2.8 2002/06/29 05:09:26 tjr Exp $
39  * $DragonFly: src/bin/cat/cat.c,v 1.10 2004/07/27 16:21:52 hmp Exp $
40  */
41
42 #include <sys/param.h>
43 #include <sys/stat.h>
44 #ifndef NO_UDOM_SUPPORT
45 #include <sys/socket.h>
46 #include <sys/un.h>
47 #include <errno.h>
48 #endif
49
50 #include <ctype.h>
51 #include <err.h>
52 #include <fcntl.h>
53 #include <locale.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58 #include <stddef.h>
59
60 static int bflag, eflag, nflag, sflag, tflag, vflag;
61 static int rval;
62 static const char *filename;
63
64 static void scanfiles (char **, int);
65 static void cook_cat (FILE *);
66 static void raw_cat (int);
67
68 #ifndef NO_UDOM_SUPPORT
69 static int udom_open (const char *path, int flags);
70 #endif
71
72 static void
73 usage(void)
74 {
75         fprintf(stderr,
76                 "usage: cat [-benstuv] [-] [file ...]\n");
77         exit(EXIT_FAILURE);
78 }
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                         /* NOTREACHED */
113                 }
114         argv += optind;
115
116         if (bflag || eflag || nflag || sflag || tflag || vflag)
117                 scanfiles(argv, 1);
118         else
119                 scanfiles(argv, 0);
120         if (fclose(stdout))
121                 err(1, "stdout");
122         exit(rval);
123         /* NOTREACHED */
124 }
125
126 static void
127 scanfiles(char **argv, int cooked)
128 {
129         int i = 0;
130         char *path;
131         FILE *fp;
132
133         while ((path = argv[i]) != NULL || i == 0) {
134                 int fd;
135
136                 if (path == NULL || strcmp(path, "-") == 0) {
137                         filename = "stdin";
138                         fd = STDIN_FILENO;
139                 } else {
140                         filename = path;
141                         fd = open(path, O_RDONLY);
142 #ifndef NO_UDOM_SUPPORT
143                         if (fd < 0 && errno == EOPNOTSUPP)
144                                 fd = udom_open(path, O_RDONLY);
145 #endif
146                 }
147                 if (fd < 0) {
148                         warn("%s", path);
149                         rval = 1;
150                 } else if (cooked) {
151                         if (fd == STDIN_FILENO)
152                                 cook_cat(stdin);
153                         else {
154                                 fp = fdopen(fd, "r");
155                                 cook_cat(fp);
156                                 fclose(fp);
157                         }
158                 } else {
159                         raw_cat(fd);
160                         if (fd != STDIN_FILENO)
161                                 close(fd);
162                 }
163                 if (path == NULL)
164                         break;
165                 ++i;
166         }
167 }
168
169 static void
170 cook_cat(FILE *fp)
171 {
172         int ch, gobble, line, prev;
173
174         /* Reset EOF condition on stdin. */
175         if (fp == stdin && feof(stdin))
176                 clearerr(stdin);
177
178         line = gobble = 0;
179         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
180                 if (prev == '\n') {
181                         if (ch == '\n') {
182                                 if (sflag) {
183                                         if (!gobble && putchar(ch) == EOF)
184                                                 break;
185                                         gobble = 1;
186                                         continue;
187                                 }
188                                 if (nflag && !bflag) {
189                                         fprintf(stdout, "%6d\t", ++line);
190                                         if (ferror(stdout))
191                                                 break;
192                                 }
193                         } else if (nflag) {
194                                 fprintf(stdout, "%6d\t", ++line);
195                                 if (ferror(stdout))
196                                         break;
197                         }
198                 }
199                 gobble = 0;
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) && !isprint(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 = 1;
230                 clearerr(fp);
231         }
232         if (ferror(stdout))
233                 err(1, "stdout");
234 }
235
236 static void
237 raw_cat(int rfd)
238 {
239         int off, wfd;
240         ssize_t nr, nw;
241         static size_t bsize;
242         static char *buf = NULL;
243         struct stat sbuf;
244
245         wfd = fileno(stdout);
246         if (buf == NULL) {
247                 if (fstat(wfd, &sbuf))
248                         err(1, "%s", filename);
249                 bsize = MAX(sbuf.st_blksize, 1024);
250                 if ((buf = malloc(bsize)) == NULL)
251                         err(1, "buffer");
252         }
253         while ((nr = read(rfd, buf, bsize)) > 0)
254                 for (off = 0; nr; nr -= nw, off += nw)
255                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
256                                 err(1, "stdout");
257         if (nr < 0) {
258                 warn("%s", filename);
259                 rval = 1;
260         }
261 }
262
263 #ifndef NO_UDOM_SUPPORT
264
265 static int
266 udom_open(const char *path, int flags)
267 {
268         struct sockaddr_un sou;
269         int fd;
270         unsigned int len;
271
272         bzero(&sou, sizeof(sou));
273
274         /*
275          * Construct the unix domain socket address and attempt to connect
276          */
277         fd = socket(AF_UNIX, SOCK_STREAM, 0);
278         if (fd >= 0) {
279                 sou.sun_family = AF_UNIX;
280                 snprintf(sou.sun_path, sizeof(sou.sun_path), "%s", path);
281                 len = strlen(sou.sun_path);
282                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
283
284                 if (connect(fd, (void *)&sou, len) < 0) {
285                         close(fd);
286                         fd = -1;
287                 }
288         }
289
290         /*
291          * handle the open flags by shutting down appropriate directions
292          */
293         if (fd >= 0) {
294                 switch (flags & O_ACCMODE) {
295                 case O_RDONLY:
296                         if (shutdown(fd, SHUT_WR) == -1)
297                                 warn(NULL);
298                         break;
299                 case O_WRONLY:
300                         if (shutdown(fd, SHUT_RD) == -1)
301                                 warn(NULL);
302                         break;
303                 default:
304                         break;
305                 }
306         }
307         return(fd);
308 }
309
310 #endif