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 * 4. 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 33 #if 0 34 #ifndef lint 35 static char const copyright[] = 36 "@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 #endif 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; 44 #endif 45 #endif /* not lint */ 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #ifndef NO_UDOM_SUPPORT 52 #include <sys/socket.h> 53 #include <sys/un.h> 54 #include <errno.h> 55 #endif 56 57 #include <ctype.h> 58 #include <err.h> 59 #include <fcntl.h> 60 #include <locale.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include <stddef.h> 66 67 int bflag, eflag, nflag, sflag, tflag, vflag; 68 int rval; 69 const char *filename; 70 71 static void usage(void); 72 static void scanfiles(char *argv[], int cooked); 73 static void cook_cat(FILE *); 74 static void raw_cat(int); 75 76 #ifndef NO_UDOM_SUPPORT 77 static int udom_open(const char *path, int flags); 78 #endif 79 80 /* Memory strategy threshold, in pages: if physmem is larger then this, use a 81 * large buffer */ 82 #define PHYSPAGES_THRESHOLD (32*1024) 83 84 /* Maximum buffer size in bytes - do not allow it to grow larger than this */ 85 #define BUFSIZE_MAX (2*1024*1024) 86 87 /* Small (default) buffer size in bytes. It's inefficient for this to be 88 * smaller than MAXPHYS */ 89 #define BUFSIZE_SMALL (MAXPHYS) 90 91 int 92 main(int argc, char *argv[]) 93 { 94 int ch; 95 96 setlocale(LC_CTYPE, ""); 97 98 while ((ch = getopt(argc, argv, "benstuv")) != -1) 99 switch (ch) { 100 case 'b': 101 bflag = nflag = 1; /* -b implies -n */ 102 break; 103 case 'e': 104 eflag = vflag = 1; /* -e implies -v */ 105 break; 106 case 'n': 107 nflag = 1; 108 break; 109 case 's': 110 sflag = 1; 111 break; 112 case 't': 113 tflag = vflag = 1; /* -t implies -v */ 114 break; 115 case 'u': 116 setbuf(stdout, NULL); 117 break; 118 case 'v': 119 vflag = 1; 120 break; 121 default: 122 usage(); 123 } 124 argv += optind; 125 126 if (bflag || eflag || nflag || sflag || tflag || vflag) 127 scanfiles(argv, 1); 128 else 129 scanfiles(argv, 0); 130 if (fclose(stdout)) 131 err(1, "stdout"); 132 exit(rval); 133 /* NOTREACHED */ 134 } 135 136 static void 137 usage(void) 138 { 139 fprintf(stderr, "usage: cat [-benstuv] [file ...]\n"); 140 exit(1); 141 /* NOTREACHED */ 142 } 143 144 static void 145 scanfiles(char *argv[], int cooked) 146 { 147 int i = 0; 148 char *path; 149 FILE *fp; 150 151 while ((path = argv[i]) != NULL || i == 0) { 152 int fd; 153 154 if (path == NULL || strcmp(path, "-") == 0) { 155 filename = "stdin"; 156 fd = STDIN_FILENO; 157 } else { 158 filename = path; 159 fd = open(path, O_RDONLY); 160 #ifndef NO_UDOM_SUPPORT 161 if (fd < 0 && errno == EOPNOTSUPP) 162 fd = udom_open(path, O_RDONLY); 163 #endif 164 } 165 if (fd < 0) { 166 warn("%s", path); 167 rval = 1; 168 } else if (cooked) { 169 if (fd == STDIN_FILENO) 170 cook_cat(stdin); 171 else { 172 fp = fdopen(fd, "r"); 173 cook_cat(fp); 174 fclose(fp); 175 } 176 } else { 177 raw_cat(fd); 178 if (fd != STDIN_FILENO) 179 close(fd); 180 } 181 if (path == NULL) 182 break; 183 ++i; 184 } 185 } 186 187 static void 188 cook_cat(FILE *fp) 189 { 190 int ch, gobble, line, prev; 191 192 /* Reset EOF condition on stdin. */ 193 if (fp == stdin && feof(stdin)) 194 clearerr(stdin); 195 196 line = gobble = 0; 197 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 198 if (prev == '\n') { 199 if (sflag) { 200 if (ch == '\n') { 201 if (gobble) 202 continue; 203 gobble = 1; 204 } else 205 gobble = 0; 206 } 207 if (nflag && (!bflag || ch != '\n')) { 208 (void)fprintf(stdout, "%6d\t", ++line); 209 if (ferror(stdout)) 210 break; 211 } 212 } 213 if (ch == '\n') { 214 if (eflag && putchar('$') == EOF) 215 break; 216 } else if (ch == '\t') { 217 if (tflag) { 218 if (putchar('^') == EOF || putchar('I') == EOF) 219 break; 220 continue; 221 } 222 } else if (vflag) { 223 if (!isascii(ch) && !isprint(ch)) { 224 if (putchar('M') == EOF || putchar('-') == EOF) 225 break; 226 ch = toascii(ch); 227 } 228 if (iscntrl(ch)) { 229 if (putchar('^') == EOF || 230 putchar(ch == '\177' ? '?' : 231 ch | 0100) == EOF) 232 break; 233 continue; 234 } 235 } 236 if (putchar(ch) == EOF) 237 break; 238 } 239 if (ferror(fp)) { 240 warn("%s", filename); 241 rval = 1; 242 clearerr(fp); 243 } 244 if (ferror(stdout)) 245 err(1, "stdout"); 246 } 247 248 static void 249 raw_cat(int rfd) 250 { 251 int off, wfd; 252 ssize_t nr, nw; 253 static size_t bsize; 254 static char *buf = NULL; 255 struct stat sbuf; 256 257 wfd = fileno(stdout); 258 if (buf == NULL) { 259 if (fstat(wfd, &sbuf)) 260 err(1, "%s", filename); 261 if (S_ISREG(sbuf.st_mode)) { 262 /* If there's plenty of RAM, use a large copy buffer */ 263 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) 264 bsize = MIN(BUFSIZE_MAX, MAXPHYS*8); 265 else 266 bsize = BUFSIZE_SMALL; 267 } else 268 bsize = MAX(sbuf.st_blksize, 269 (blksize_t)sysconf(_SC_PAGESIZE)); 270 if ((buf = malloc(bsize)) == NULL) 271 err(1, "malloc() failure of IO buffer"); 272 } 273 while ((nr = read(rfd, buf, bsize)) > 0) 274 for (off = 0; nr; nr -= nw, off += nw) 275 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 276 err(1, "stdout"); 277 if (nr < 0) { 278 warn("%s", filename); 279 rval = 1; 280 } 281 } 282 283 #ifndef NO_UDOM_SUPPORT 284 285 static int 286 udom_open(const char *path, int flags) 287 { 288 struct sockaddr_un sou; 289 int fd; 290 unsigned int len; 291 292 bzero(&sou, sizeof(sou)); 293 294 /* 295 * Construct the unix domain socket address and attempt to connect 296 */ 297 fd = socket(AF_UNIX, SOCK_STREAM, 0); 298 if (fd >= 0) { 299 sou.sun_family = AF_UNIX; 300 if ((len = strlcpy(sou.sun_path, path, 301 sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) { 302 errno = ENAMETOOLONG; 303 return (-1); 304 } 305 len = offsetof(struct sockaddr_un, sun_path[len+1]); 306 307 if (connect(fd, (void *)&sou, len) < 0) { 308 close(fd); 309 fd = -1; 310 } 311 } 312 313 /* 314 * handle the open flags by shutting down appropriate directions 315 */ 316 if (fd >= 0) { 317 switch(flags & O_ACCMODE) { 318 case O_RDONLY: 319 if (shutdown(fd, SHUT_WR) == -1) 320 warn(NULL); 321 break; 322 case O_WRONLY: 323 if (shutdown(fd, SHUT_RD) == -1) 324 warn(NULL); 325 break; 326 default: 327 break; 328 } 329 } 330 return(fd); 331 } 332 333 #endif 334