cat.c revision 240408
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 35static 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 43static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; 44#endif 45#endif /* not lint */ 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: stable/9/bin/cat/cat.c 240408 2012-09-12 16:01:48Z jh $"); 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 <stddef.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <unistd.h> 66 67int bflag, eflag, nflag, sflag, tflag, vflag; 68int rval; 69const char *filename; 70 71static void usage(void); 72static void scanfiles(char *argv[], int cooked); 73static void cook_cat(FILE *); 74static void raw_cat(int); 75 76#ifndef NO_UDOM_SUPPORT 77static int udom_open(const char *path, int flags); 78#endif 79 80/* 81 * Memory strategy threshold, in pages: if physmem is larger than this, 82 * use a large buffer. 83 */ 84#define PHYSPAGES_THRESHOLD (32 * 1024) 85 86/* Maximum buffer size in bytes - do not allow it to grow larger than this. */ 87#define BUFSIZE_MAX (2 * 1024 * 1024) 88 89/* 90 * Small (default) buffer size in bytes. It's inefficient for this to be 91 * smaller than MAXPHYS. 92 */ 93#define BUFSIZE_SMALL (MAXPHYS) 94 95int 96main(int argc, char *argv[]) 97{ 98 int ch; 99 100 setlocale(LC_CTYPE, ""); 101 102 while ((ch = getopt(argc, argv, "benstuv")) != -1) 103 switch (ch) { 104 case 'b': 105 bflag = nflag = 1; /* -b implies -n */ 106 break; 107 case 'e': 108 eflag = vflag = 1; /* -e implies -v */ 109 break; 110 case 'n': 111 nflag = 1; 112 break; 113 case 's': 114 sflag = 1; 115 break; 116 case 't': 117 tflag = vflag = 1; /* -t implies -v */ 118 break; 119 case 'u': 120 setbuf(stdout, NULL); 121 break; 122 case 'v': 123 vflag = 1; 124 break; 125 default: 126 usage(); 127 } 128 argv += optind; 129 130 if (bflag || eflag || nflag || sflag || tflag || vflag) 131 scanfiles(argv, 1); 132 else 133 scanfiles(argv, 0); 134 if (fclose(stdout)) 135 err(1, "stdout"); 136 exit(rval); 137 /* NOTREACHED */ 138} 139 140static void 141usage(void) 142{ 143 fprintf(stderr, "usage: cat [-benstuv] [file ...]\n"); 144 exit(1); 145 /* NOTREACHED */ 146} 147 148static void 149scanfiles(char *argv[], int cooked) 150{ 151 int fd, i; 152 char *path; 153 FILE *fp; 154 155 i = 0; 156 while ((path = argv[i]) != NULL || i == 0) { 157 if (path == NULL || strcmp(path, "-") == 0) { 158 filename = "stdin"; 159 fd = STDIN_FILENO; 160 } else { 161 filename = path; 162 fd = open(path, O_RDONLY); 163#ifndef NO_UDOM_SUPPORT 164 if (fd < 0 && errno == EOPNOTSUPP) 165 fd = udom_open(path, O_RDONLY); 166#endif 167 } 168 if (fd < 0) { 169 warn("%s", path); 170 rval = 1; 171 } else if (cooked) { 172 if (fd == STDIN_FILENO) 173 cook_cat(stdin); 174 else { 175 fp = fdopen(fd, "r"); 176 cook_cat(fp); 177 fclose(fp); 178 } 179 } else { 180 raw_cat(fd); 181 if (fd != STDIN_FILENO) 182 close(fd); 183 } 184 if (path == NULL) 185 break; 186 ++i; 187 } 188} 189 190static void 191cook_cat(FILE *fp) 192{ 193 int ch, gobble, line, prev; 194 195 /* Reset EOF condition on stdin. */ 196 if (fp == stdin && feof(stdin)) 197 clearerr(stdin); 198 199 line = gobble = 0; 200 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 201 if (prev == '\n') { 202 if (sflag) { 203 if (ch == '\n') { 204 if (gobble) 205 continue; 206 gobble = 1; 207 } else 208 gobble = 0; 209 } 210 if (nflag && (!bflag || ch != '\n')) { 211 (void)fprintf(stdout, "%6d\t", ++line); 212 if (ferror(stdout)) 213 break; 214 } 215 } 216 if (ch == '\n') { 217 if (eflag && putchar('$') == EOF) 218 break; 219 } else if (ch == '\t') { 220 if (tflag) { 221 if (putchar('^') == EOF || putchar('I') == EOF) 222 break; 223 continue; 224 } 225 } else if (vflag) { 226 if (!isascii(ch) && !isprint(ch)) { 227 if (putchar('M') == EOF || putchar('-') == EOF) 228 break; 229 ch = toascii(ch); 230 } 231 if (iscntrl(ch)) { 232 if (putchar('^') == EOF || 233 putchar(ch == '\177' ? '?' : 234 ch | 0100) == EOF) 235 break; 236 continue; 237 } 238 } 239 if (putchar(ch) == EOF) 240 break; 241 } 242 if (ferror(fp)) { 243 warn("%s", filename); 244 rval = 1; 245 clearerr(fp); 246 } 247 if (ferror(stdout)) 248 err(1, "stdout"); 249} 250 251static void 252raw_cat(int rfd) 253{ 254 int off, wfd; 255 ssize_t nr, nw; 256 static size_t bsize; 257 static char *buf = NULL; 258 struct stat sbuf; 259 260 wfd = fileno(stdout); 261 if (buf == NULL) { 262 if (fstat(wfd, &sbuf)) 263 err(1, "stdout"); 264 if (S_ISREG(sbuf.st_mode)) { 265 /* If there's plenty of RAM, use a large copy buffer */ 266 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) 267 bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); 268 else 269 bsize = BUFSIZE_SMALL; 270 } else 271 bsize = MAX(sbuf.st_blksize, 272 (blksize_t)sysconf(_SC_PAGESIZE)); 273 if ((buf = malloc(bsize)) == NULL) 274 err(1, "malloc() failure of IO buffer"); 275 } 276 while ((nr = read(rfd, buf, bsize)) > 0) 277 for (off = 0; nr; nr -= nw, off += nw) 278 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 279 err(1, "stdout"); 280 if (nr < 0) { 281 warn("%s", filename); 282 rval = 1; 283 } 284} 285 286#ifndef NO_UDOM_SUPPORT 287 288static int 289udom_open(const char *path, int flags) 290{ 291 struct sockaddr_un sou; 292 int fd; 293 unsigned int len; 294 295 bzero(&sou, sizeof(sou)); 296 297 /* 298 * Construct the unix domain socket address and attempt to connect 299 */ 300 fd = socket(AF_UNIX, SOCK_STREAM, 0); 301 if (fd >= 0) { 302 sou.sun_family = AF_UNIX; 303 if ((len = strlcpy(sou.sun_path, path, 304 sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) { 305 errno = ENAMETOOLONG; 306 return (-1); 307 } 308 len = offsetof(struct sockaddr_un, sun_path[len+1]); 309 310 if (connect(fd, (void *)&sou, len) < 0) { 311 close(fd); 312 fd = -1; 313 } 314 } 315 316 /* 317 * handle the open flags by shutting down appropriate directions 318 */ 319 if (fd >= 0) { 320 switch(flags & O_ACCMODE) { 321 case O_RDONLY: 322 if (shutdown(fd, SHUT_WR) == -1) 323 warn(NULL); 324 break; 325 case O_WRONLY: 326 if (shutdown(fd, SHUT_RD) == -1) 327 warn(NULL); 328 break; 329 default: 330 break; 331 } 332 } 333 return (fd); 334} 335 336#endif 337