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 1.13 2004/11/07 23:44:38 dillon 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 <stddef.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 static int bflag, eflag, nflag, sflag, tflag, vflag, rval; 61 static const char *filename; 62 63 static void scanfiles (char **, int); 64 static void cook_cat (FILE *); 65 static void raw_cat (int); 66 67 #ifndef NO_UDOM_SUPPORT 68 static int udom_open (const char *path, int flags); 69 #endif 70 71 static void 72 usage(void) 73 { 74 fprintf(stderr, 75 "usage: cat [-benstuv] [-] [file ...]\n"); 76 exit(EXIT_FAILURE); 77 } 78 79 int 80 main(int argc, char **argv) 81 { 82 int ch; 83 84 setlocale(LC_CTYPE, ""); 85 86 while ((ch = getopt(argc, argv, "benstuv")) != -1) 87 switch (ch) { 88 case 'b': 89 bflag = nflag = 1; /* -b implies -n */ 90 break; 91 case 'e': 92 eflag = vflag = 1; /* -e implies -v */ 93 break; 94 case 'n': 95 nflag = 1; 96 break; 97 case 's': 98 sflag = 1; 99 break; 100 case 't': 101 tflag = vflag = 1; /* -t implies -v */ 102 break; 103 case 'u': 104 setbuf(stdout, NULL); 105 break; 106 case 'v': 107 vflag = 1; 108 break; 109 default: 110 usage(); 111 /* NOTREACHED */ 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 scanfiles(char **argv, int cooked) 127 { 128 char *path; 129 FILE *fp; 130 int fd; 131 int i; 132 133 i = 0; 134 135 while ((path = argv[i]) != NULL || i == 0) { 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 if (fp == NULL) 156 err(1, "%s", path); 157 cook_cat(fp); 158 fclose(fp); 159 } 160 } else { 161 raw_cat(fd); 162 if (fd != STDIN_FILENO) 163 close(fd); 164 } 165 if (path == NULL) 166 break; 167 ++i; 168 } 169 } 170 171 static void 172 cook_cat(FILE *fp) 173 { 174 int ch, gobble, line, prev; 175 176 /* Reset EOF condition on stdin. */ 177 if (fp == stdin && feof(stdin)) 178 clearerr(stdin); 179 180 line = gobble = 0; 181 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 182 if (prev == '\n') { 183 if (ch == '\n') { 184 if (sflag) { 185 if (!gobble && putchar(ch) == EOF) 186 break; 187 gobble = 1; 188 continue; 189 } 190 if (nflag && !bflag) { 191 fprintf(stdout, "%6d\t", ++line); 192 if (ferror(stdout)) 193 break; 194 } 195 } else if (nflag) { 196 fprintf(stdout, "%6d\t", ++line); 197 if (ferror(stdout)) 198 break; 199 } 200 } 201 gobble = 0; 202 if (ch == '\n') { 203 if (eflag) 204 if (putchar('$') == EOF) 205 break; 206 } else if (ch == '\t') { 207 if (tflag) { 208 if (putchar('^') == EOF || putchar('I') == EOF) 209 break; 210 continue; 211 } 212 } else if (vflag) { 213 if (!isascii(ch) && !isprint(ch)) { 214 if (putchar('M') == EOF || putchar('-') == EOF) 215 break; 216 ch = toascii(ch); 217 } 218 if (iscntrl(ch)) { 219 if (putchar('^') == EOF || 220 putchar(ch == '\177' ? '?' : 221 ch | 0100) == EOF) 222 break; 223 continue; 224 } 225 } 226 if (putchar(ch) == EOF) 227 break; 228 } 229 if (ferror(fp)) { 230 warn("%s", filename); 231 rval = 1; 232 clearerr(fp); 233 } 234 if (ferror(stdout)) 235 err(1, "stdout"); 236 } 237 238 static void 239 raw_cat(int rfd) 240 { 241 int off; 242 size_t nbsize; 243 ssize_t nr; 244 ssize_t nw; 245 struct stat rst; 246 static struct stat ost; 247 static size_t bsize; 248 static char *buf; 249 250 /* 251 * Figure out the block size to use. Use the larger of stdout vs 252 * the passed descriptor. The minimum blocksize we use is BUFSIZ. 253 */ 254 if (ost.st_blksize == 0) { 255 if (fstat(STDOUT_FILENO, &ost)) 256 err(1, "<stdout>"); 257 if (ost.st_blksize < BUFSIZ) 258 ost.st_blksize = BUFSIZ; 259 } 260 /* 261 * note: rst.st_blksize can be 0, but it is handled ok. 262 */ 263 if (fstat(rfd, &rst)) 264 err(1, "%s", filename); 265 266 nbsize = MAX(ost.st_blksize, rst.st_blksize); 267 if (bsize != nbsize) { 268 bsize = nbsize; 269 if ((buf = realloc(buf, bsize)) == NULL) 270 err(1, "malloc failed"); 271 } 272 while ((nr = read(rfd, buf, bsize)) > 0) { 273 for (off = 0; nr; nr -= nw, off += nw) { 274 nw = write(STDOUT_FILENO, buf + off, nr); 275 if (nw < 0) 276 err(1, "stdout"); 277 } 278 } 279 if (nr < 0) { 280 warn("%s", filename); 281 rval = 1; 282 } 283 } 284 285 #ifndef NO_UDOM_SUPPORT 286 287 static int 288 udom_open(const char *path, int flags) 289 { 290 struct sockaddr_un sou; 291 int fd; 292 unsigned int len; 293 294 bzero(&sou, sizeof(sou)); 295 296 /* 297 * Construct the unix domain socket address and attempt to connect 298 */ 299 fd = socket(AF_UNIX, SOCK_STREAM, 0); 300 if (fd >= 0) { 301 sou.sun_family = AF_UNIX; 302 snprintf(sou.sun_path, sizeof(sou.sun_path), "%s", path); 303 len = strlen(sou.sun_path); 304 len = offsetof(struct sockaddr_un, sun_path[len+1]); 305 306 if (connect(fd, (void *)&sou, len) < 0) { 307 close(fd); 308 fd = -1; 309 } 310 } 311 312 /* 313 * handle the open flags by shutting down appropriate directions 314 */ 315 if (fd >= 0) { 316 switch (flags & O_ACCMODE) { 317 case O_RDONLY: 318 if (shutdown(fd, SHUT_WR) == -1) 319 warn(NULL); 320 break; 321 case O_WRONLY: 322 if (shutdown(fd, SHUT_RD) == -1) 323 warn(NULL); 324 break; 325 default: 326 break; 327 } 328 } 329 return(fd); 330 } 331 332 #endif 333