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 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 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 scanfiles(char **argv, int cooked); 74 static void cook_cat(FILE *); 75 static void raw_cat(int); 76 77 #ifndef NO_UDOM_SUPPORT 78 static int udom_open(const char *path, int flags); 79 #endif 80 81 int 82 main(int argc, char *argv[]) 83 { 84 int ch; 85 86 setlocale(LC_CTYPE, ""); 87 88 while ((ch = getopt(argc, argv, "benstuv")) != -1) 89 switch (ch) { 90 case 'b': 91 bflag = nflag = 1; /* -b implies -n */ 92 break; 93 case 'e': 94 eflag = vflag = 1; /* -e implies -v */ 95 break; 96 case 'n': 97 nflag = 1; 98 break; 99 case 's': 100 sflag = 1; 101 break; 102 case 't': 103 tflag = vflag = 1; /* -t implies -v */ 104 break; 105 case 'u': 106 setbuf(stdout, NULL); 107 break; 108 case 'v': 109 vflag = 1; 110 break; 111 default: 112 fprintf(stderr, 113 "usage: cat [-benstuv] [-] [file ...]\n"); 114 exit(1); 115 } 116 argv += optind; 117 118 if (bflag || eflag || nflag || sflag || tflag || vflag) 119 scanfiles(argv, 1); 120 else 121 scanfiles(argv, 0); 122 if (fclose(stdout)) 123 err(1, "stdout"); 124 exit(rval); 125 } 126 127 void 128 scanfiles(char **argv, int cooked) 129 { 130 int i = 0; 131 char *path; 132 FILE *fp; 133 134 while ((path = argv[i]) != NULL || i == 0) { 135 int fd; 136 137 if (path == NULL || strcmp(path, "-") == 0) { 138 filename = "stdin"; 139 fd = STDIN_FILENO; 140 } else { 141 filename = path; 142 fd = open(path, O_RDONLY); 143 #ifndef NO_UDOM_SUPPORT 144 if (fd < 0 && errno == EOPNOTSUPP) 145 fd = udom_open(path, O_RDONLY); 146 #endif 147 } 148 if (fd < 0) { 149 warn("%s", path); 150 rval = 1; 151 } else if (cooked) { 152 if (fd == STDIN_FILENO) 153 cook_cat(stdin); 154 else { 155 fp = fdopen(fd, "r"); 156 cook_cat(fp); 157 fclose(fp); 158 } 159 } else { 160 raw_cat(fd); 161 if (fd != STDIN_FILENO) 162 close(fd); 163 } 164 if (path == NULL) 165 break; 166 ++i; 167 } 168 } 169 170 static void 171 cook_cat(FILE *fp) 172 { 173 int ch, gobble, line, prev; 174 175 /* Reset EOF condition on stdin. */ 176 if (fp == stdin && feof(stdin)) 177 clearerr(stdin); 178 179 line = gobble = 0; 180 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 181 if (prev == '\n') { 182 if (ch == '\n') { 183 if (sflag) { 184 if (!gobble && putchar(ch) == EOF) 185 break; 186 gobble = 1; 187 continue; 188 } 189 if (nflag && !bflag) { 190 fprintf(stdout, "%6d\t", ++line); 191 if (ferror(stdout)) 192 break; 193 } 194 } else if (nflag) { 195 fprintf(stdout, "%6d\t", ++line); 196 if (ferror(stdout)) 197 break; 198 } 199 } 200 gobble = 0; 201 if (ch == '\n') { 202 if (eflag) 203 if (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 snprintf(sou.sun_path, sizeof(sou.sun_path), "%s", path); 282 len = strlen(sou.sun_path); 283 len = offsetof(struct sockaddr_un, sun_path[len+1]); 284 285 if (connect(fd, (void *)&sou, len) < 0) { 286 close(fd); 287 fd = -1; 288 } 289 } 290 291 /* 292 * handle the open flags by shutting down appropriate directions 293 */ 294 if (fd >= 0) { 295 switch(flags & O_ACCMODE) { 296 case O_RDONLY: 297 if (shutdown(fd, SHUT_WR) == -1) 298 perror("cat"); 299 break; 300 case O_WRONLY: 301 if (shutdown(fd, SHUT_RD) == -1) 302 perror("cat"); 303 break; 304 default: 305 break; 306 } 307 } 308 return(fd); 309 } 310 311 #endif 312