<ifaddrs.h>: Clean it up a bit.
[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. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
33  * @(#)cat.c    8.2 (Berkeley) 4/27/95
34  * $FreeBSD: src/bin/cat/cat.c,v 1.14.2.8 2002/06/29 05:09:26 tjr Exp $
35  * $DragonFly: src/bin/cat/cat.c,v 1.16 2007/02/04 21:06:34 pavalos Exp $
36  */
37
38 #include <sys/param.h>
39 #include <sys/stat.h>
40 #ifndef NO_UDOM_SUPPORT
41 #include <sys/socket.h>
42 #include <sys/un.h>
43 #include <errno.h>
44 #endif
45
46 #include <ctype.h>
47 #include <err.h>
48 #include <fcntl.h>
49 #include <locale.h>
50 #include <stddef.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 static int bflag, eflag, nflag, sflag, tflag, vflag, rval;
57 static const char *filename;
58
59 static void     scanfiles(char **, int);
60 static void     cook_cat(FILE *);
61 static void     raw_cat(int);
62
63 #ifndef NO_UDOM_SUPPORT
64 static int      udom_open(const char *, int);
65 #endif
66
67 static void
68 usage(void)
69 {
70         fprintf(stderr,
71                 "usage: cat [-benstuv] [file ...]\n");
72         exit(EXIT_FAILURE);
73 }
74
75 int
76 main(int argc, char **argv)
77 {
78         int ch;
79
80         setlocale(LC_CTYPE, "");
81
82         while ((ch = getopt(argc, argv, "benstuv")) != -1)
83                 switch (ch) {
84                 case 'b':
85                         bflag = nflag = 1;      /* -b implies -n */
86                         break;
87                 case 'e':
88                         eflag = vflag = 1;      /* -e implies -v */
89                         break;
90                 case 'n':
91                         nflag = 1;
92                         break;
93                 case 's':
94                         sflag = 1;
95                         break;
96                 case 't':
97                         tflag = vflag = 1;      /* -t implies -v */
98                         break;
99                 case 'u':
100                         setbuf(stdout, NULL);
101                         break;
102                 case 'v':
103                         vflag = 1;
104                         break;
105                 default:
106                         usage();
107                         /* NOTREACHED */
108                 }
109         argv += optind;
110
111         if (bflag || eflag || nflag || sflag || tflag || vflag)
112                 scanfiles(argv, 1);
113         else
114                 scanfiles(argv, 0);
115         if (fclose(stdout))
116                 err(1, "stdout");
117         exit(rval);
118         /* NOTREACHED */
119 }
120
121 static void
122 scanfiles(char **argv, int cooked)
123 {
124         char *path;
125         FILE *fp;
126         int fd;
127         int i;
128
129         i = 0;
130
131         while ((path = argv[i]) != NULL || i == 0) {
132                 if (path == NULL || strcmp(path, "-") == 0) {
133                         filename = "stdin";
134                         fd = STDIN_FILENO;
135                 } else {
136                         filename = path;
137                         fd = open(path, O_RDONLY);
138 #ifndef NO_UDOM_SUPPORT
139                         if (fd < 0 && errno == EOPNOTSUPP)
140                                 fd = udom_open(path, O_RDONLY);
141 #endif
142                 }
143                 if (fd < 0) {
144                         warn("%s", path);
145                         rval = 1;
146                 } else if (cooked) {
147                         if (fd == STDIN_FILENO) {
148                                 cook_cat(stdin);
149                         } else {
150                                 fp = fdopen(fd, "r");
151                                 if (fp == NULL)
152                                         err(1, "%s", path);
153                                 cook_cat(fp);
154                                 fclose(fp);
155                         }
156                 } else {
157                         raw_cat(fd);
158                         if (fd != STDIN_FILENO)
159                                 close(fd);
160                 }
161                 if (path == NULL)
162                         break;
163                 ++i;
164         }
165 }
166
167 static void
168 cook_cat(FILE *fp)
169 {
170         int ch, gobble, line, prev;
171
172         /* Reset EOF condition on stdin. */
173         if (fp == stdin && feof(stdin))
174                 clearerr(stdin);
175
176         line = gobble = 0;
177         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
178                 if (prev == '\n') {
179                         if (sflag) {
180                                 if (ch == '\n') {
181                                         if (gobble)
182                                                 continue;
183                                         gobble = 1;
184                                 } else
185                                         gobble = 0;
186                         }
187                         if (nflag) {
188                                 if (!bflag || ch != '\n') {
189                                         fprintf(stdout, "%6d\t", ++line);
190                                         if (ferror(stdout))
191                                                 break;
192                                 } else if (eflag) {
193                                         fprintf(stdout, "%6s\t", "");
194                                         if (ferror(stdout))
195                                                 break;
196                                 }
197                         }
198                 }
199                 if (ch == '\n') {
200                         if (eflag && 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) && !isprint(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 = 1;
228                 clearerr(fp);
229         }
230         if (ferror(stdout))
231                 err(1, "stdout");
232 }
233
234 static void
235 raw_cat(int rfd)
236 {
237         int off;
238         size_t nbsize;
239         ssize_t nr, nw;
240         struct stat rst;
241         static struct stat ost;
242         static size_t bsize;
243         static char *buf;
244
245         /*
246          * Figure out the block size to use.  Use the larger of stdout vs
247          * the passed descriptor.  The minimum blocksize we use is BUFSIZ.
248          */
249         if (ost.st_blksize == 0) {
250                 if (fstat(STDOUT_FILENO, &ost))
251                         err(1, "<stdout>");
252                 if (ost.st_blksize < BUFSIZ)
253                         ost.st_blksize = BUFSIZ;
254         }
255         /*
256          * note: rst.st_blksize can be 0, but it is handled ok.
257          */
258         if (fstat(rfd, &rst))
259                 err(1, "%s", filename);
260
261         nbsize = MAX(ost.st_blksize, rst.st_blksize);
262         if (bsize != nbsize) {
263                 bsize = nbsize;
264                 if ((buf = realloc(buf, bsize)) == NULL)
265                         err(1, "malloc failed");
266         }
267         while ((nr = read(rfd, buf, bsize)) > 0) {
268                 for (off = 0; nr; nr -= nw, off += nw) {
269                         nw = write(STDOUT_FILENO, buf + off, nr);
270                         if (nw < 0)
271                                 err(1, "stdout");
272                 }
273         }
274         if (nr < 0) {
275                 warn("%s", filename);
276                 rval = 1;
277         }
278 }
279
280 #ifndef NO_UDOM_SUPPORT
281
282 static int
283 udom_open(const char *path, int flags)
284 {
285         struct sockaddr_un sou;
286         int fd;
287         unsigned int len;
288
289         bzero(&sou, sizeof(sou));
290
291         /*
292          * Construct the unix domain socket address and attempt to connect
293          */
294         fd = socket(AF_UNIX, SOCK_STREAM, 0);
295         if (fd >= 0) {
296                 sou.sun_family = AF_UNIX;
297                 if ((len = strlcpy(sou.sun_path, path,
298                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
299                         errno = ENAMETOOLONG;
300                         return (-1);
301                 }
302                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
303
304                 if (connect(fd, (void *)&sou, len) < 0) {
305                         close(fd);
306                         fd = -1;
307                 }
308         }
309
310         /*
311          * handle the open flags by shutting down appropriate directions
312          */
313         if (fd >= 0) {
314                 switch (flags & O_ACCMODE) {
315                 case O_RDONLY:
316                         if (shutdown(fd, SHUT_WR) == -1)
317                                 warn(NULL);
318                         break;
319                 case O_WRONLY:
320                         if (shutdown(fd, SHUT_RD) == -1)
321                                 warn(NULL);
322                         break;
323                 default:
324                         break;
325                 }
326         }
327         return(fd);
328 }
329
330 #endif