1 /* $NetBSD: cat.c,v 1.43 2004/01/04 03:31:28 jschauma Exp $ */
2
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 #include <sys/param.h>
36 #include <sys/stat.h>
37
38 #include <ctype.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #define CAT_BUFSIZ (4096)
47
48 static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
49 static int rval;
50 static const char *filename;
51
52 static void
cook_buf(FILE * fp)53 cook_buf(FILE *fp)
54 {
55 int ch, gobble, line, prev;
56 int stdout_err = 0;
57
58 line = gobble = 0;
59 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
60 if (prev == '\n') {
61 if (ch == '\n') {
62 if (sflag) {
63 if (!gobble && putchar(ch) == EOF)
64 break;
65 gobble = 1;
66 continue;
67 }
68 if (nflag) {
69 if (!bflag) {
70 if (fprintf(stdout,
71 "%6d\t", ++line) < 0) {
72 stdout_err++;
73 break;
74 }
75 } else if (eflag) {
76 if (fprintf(stdout,
77 "%6s\t", "") < 0) {
78 stdout_err++;
79 break;
80 }
81 }
82 }
83 } else if (nflag) {
84 if (fprintf(stdout, "%6d\t", ++line) < 0) {
85 stdout_err++;
86 break;
87 }
88 }
89 }
90 gobble = 0;
91 if (ch == '\n') {
92 if (eflag)
93 if (putchar('$') == EOF)
94 break;
95 } else if (ch == '\t') {
96 if (tflag) {
97 if (putchar('^') == EOF || putchar('I') == EOF)
98 break;
99 continue;
100 }
101 } else if (vflag) {
102 if (!isascii(ch)) {
103 if (putchar('M') == EOF || putchar('-') == EOF)
104 break;
105 ch = (ch) & 0x7f;
106 }
107 if (iscntrl(ch)) {
108 if (putchar('^') == EOF ||
109 putchar(ch == '\177' ? '?' :
110 ch | 0100) == EOF)
111 break;
112 continue;
113 }
114 }
115 if (putchar(ch) == EOF)
116 break;
117 }
118 if (stdout_err) {
119 perror(filename);
120 rval = 1;
121 }
122 }
123
124 static void
cook_args(char ** argv)125 cook_args(char **argv)
126 {
127 FILE *fp;
128
129 fp = stdin;
130 filename = "stdin";
131 do {
132 if (*argv) {
133 if (!strcmp(*argv, "-"))
134 fp = stdin;
135 else if ((fp = fopen(*argv,
136 fflag ? "rf" : "r")) == NULL) {
137 perror("fopen");
138 rval = 1;
139 ++argv;
140 continue;
141 }
142 filename = *argv++;
143 }
144 cook_buf(fp);
145 if (fp != stdin)
146 fclose(fp);
147 } while (*argv);
148 }
149
150 static void
raw_cat(int rfd)151 raw_cat(int rfd)
152 {
153 static char *buf;
154 static char fb_buf[CAT_BUFSIZ];
155 static size_t bsize;
156
157 struct stat sbuf;
158 ssize_t nr, nw, off;
159 int wfd;
160
161 wfd = fileno(stdout);
162 if (buf == NULL) {
163 if (fstat(wfd, &sbuf) == 0) {
164 bsize = sbuf.st_blksize > CAT_BUFSIZ ?
165 sbuf.st_blksize : CAT_BUFSIZ;
166 buf = malloc(bsize);
167 }
168 if (buf == NULL) {
169 buf = fb_buf;
170 bsize = CAT_BUFSIZ;
171 }
172 }
173 while ((nr = read(rfd, buf, bsize)) > 0)
174 for (off = 0; nr; nr -= nw, off += nw)
175 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
176 {
177 perror("write");
178 exit(EXIT_FAILURE);
179 }
180 if (nr < 0) {
181 fprintf(stderr,"%s: invalid length\n", filename);
182 rval = 1;
183 }
184 }
185
186 static void
raw_args(char ** argv)187 raw_args(char **argv)
188 {
189 int fd;
190
191 fd = fileno(stdin);
192 filename = "stdin";
193 do {
194 if (*argv) {
195 if (!strcmp(*argv, "-"))
196 fd = fileno(stdin);
197 else if (fflag) {
198 struct stat st;
199 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
200 if (fd < 0)
201 goto skip;
202
203 if (fstat(fd, &st) == -1) {
204 close(fd);
205 goto skip;
206 }
207 if (!S_ISREG(st.st_mode)) {
208 close(fd);
209 errno = EINVAL;
210 goto skipnomsg;
211 }
212 }
213 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
214 skip:
215 perror(*argv);
216 skipnomsg:
217 rval = 1;
218 ++argv;
219 continue;
220 }
221 filename = *argv++;
222 }
223 raw_cat(fd);
224 if (fd != fileno(stdin))
225 close(fd);
226 } while (*argv);
227 }
228
229 int
cat_main(int argc,char * argv[])230 cat_main(int argc, char *argv[])
231 {
232 int ch;
233 struct flock stdout_lock;
234
235 while ((ch = getopt(argc, argv, "beflnstv")) != -1)
236 switch (ch) {
237 case 'b':
238 bflag = nflag = 1; /* -b implies -n */
239 break;
240 case 'e':
241 eflag = vflag = 1; /* -e implies -v */
242 break;
243 case 'f':
244 fflag = 1;
245 break;
246 case 'l':
247 lflag = 1;
248 break;
249 case 'n':
250 nflag = 1;
251 break;
252 case 's':
253 sflag = 1;
254 break;
255 case 't':
256 tflag = vflag = 1; /* -t implies -v */
257 break;
258 case 'v':
259 vflag = 1;
260 break;
261 default:
262 case '?':
263 fprintf(stderr,
264 "usage: cat [-beflnstv] [-] [file ...]\n");
265 exit(EXIT_FAILURE);
266 }
267 argv += optind;
268
269 if (lflag) {
270 stdout_lock.l_len = 0;
271 stdout_lock.l_start = 0;
272 stdout_lock.l_type = F_WRLCK;
273 stdout_lock.l_whence = SEEK_SET;
274 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
275 {
276 perror("fcntl");
277 exit(EXIT_FAILURE);
278 }
279 }
280
281 if (bflag || eflag || nflag || sflag || tflag || vflag)
282 cook_args(argv);
283 else
284 raw_args(argv);
285 if (fclose(stdout))
286 {
287 perror("fclose");
288 exit(EXIT_FAILURE);
289 }
290 exit(rval);
291 }
292