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 37 #ifndef lint 38 static char const copyright[] = 39 "@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; 46 #endif 47 #endif /* not lint */ 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #ifndef NO_UDOM_SUPPORT 54 #include <sys/socket.h> 55 #include <sys/un.h> 56 #include <errno.h> 57 #endif 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <fcntl.h> 62 #include <locale.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <unistd.h> 67 #include <stddef.h> 68 69 int bflag, eflag, nflag, sflag, tflag, vflag; 70 int rval; 71 const char *filename; 72 73 static void usage(void); 74 static void scanfiles(char **argv, int cooked); 75 static void cook_cat(FILE *); 76 static void raw_cat(int); 77 78 #ifndef NO_UDOM_SUPPORT 79 static int udom_open(const char *path, int flags); 80 #endif 81 82 int 83 main(int argc, char *argv[]) 84 { 85 int ch; 86 87 setlocale(LC_CTYPE, ""); 88 89 while ((ch = getopt(argc, argv, "benstuv")) != -1) 90 switch (ch) { 91 case 'b': 92 bflag = nflag = 1; /* -b implies -n */ 93 break; 94 case 'e': 95 eflag = vflag = 1; /* -e implies -v */ 96 break; 97 case 'n': 98 nflag = 1; 99 break; 100 case 's': 101 sflag = 1; 102 break; 103 case 't': 104 tflag = vflag = 1; /* -t implies -v */ 105 break; 106 case 'u': 107 setbuf(stdout, NULL); 108 break; 109 case 'v': 110 vflag = 1; 111 break; 112 default: 113 usage(); 114 } 115 argv += optind; 116 117 if (bflag || eflag || nflag || sflag || tflag || vflag) 118 scanfiles(argv, 1); 119 else 120 scanfiles(argv, 0); 121 if (fclose(stdout)) 122 err(1, "stdout"); 123 exit(rval); 124 } 125 126 static void 127 usage(void) 128 { 129 fprintf(stderr, "usage: cat [-benstuv] [file ...]\n"); 130 exit(1); 131 } 132 133 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 perror("cat"); 302 break; 303 case O_WRONLY: 304 if (shutdown(fd, SHUT_RD) == -1) 305 perror("cat"); 306 break; 307 default: 308 break; 309 } 310 } 311 return(fd); 312 } 313 314 #endif 315