bin/cat/cat.c

   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. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)cat.c    8.2 (Berkeley) 4/27/95
  34  * $FreeBSD: src/bin/cat/cat.c,v 1.14.2.8 2002/06/29 05:09:26 tjr Exp $
  35  * $DragonFly: src/bin/cat/cat.c,v 1.16 2007/02/04 21:06:34 pavalos Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40 #ifndef NO_UDOM_SUPPORT
  41 #include <sys/socket.h>
  42 #include <sys/un.h>
  43 #include <errno.h>
  44 #endif
  45
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <fcntl.h>
  49 #include <locale.h>
  50 #include <stddef.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 static int bflag, eflag, nflag, sflag, tflag, vflag, rval;
  57 static const char *filename;
  58
  59 static void     scanfiles(char **, int);
  60 static void     cook_cat(FILE *);
  61 static void     raw_cat(int);
  62
  63 #ifndef NO_UDOM_SUPPORT
  64 static int      udom_open(const char *, int);
  65 #endif
  66
  67 static void
  68 usage(void)
  69 {
  70         fprintf(stderr,
  71                 "usage: cat [-benstuv] [file ...]\n");
  72         exit(EXIT_FAILURE);
  73 }
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         int ch;
  79
  80         setlocale(LC_CTYPE, "");
  81
  82         while ((ch = getopt(argc, argv, "benstuv")) != -1)
  83                 switch (ch) {
  84                 case 'b':
  85                         bflag = nflag = 1;      /* -b implies -n */
  86                         break;
  87                 case 'e':
  88                         eflag = vflag = 1;      /* -e implies -v */
  89                         break;
  90                 case 'n':
  91                         nflag = 1;
  92                         break;
  93                 case 's':
  94                         sflag = 1;
  95                         break;
  96                 case 't':
  97                         tflag = vflag = 1;      /* -t implies -v */
  98                         break;
  99                 case 'u':
 100                         setbuf(stdout, NULL);
 101                         break;
 102                 case 'v':
 103                         vflag = 1;
 104                         break;
 105                 default:
 106                         usage();
 107                         /* NOTREACHED */
 108                 }
 109         argv += optind;
 110
 111         if (bflag || eflag || nflag || sflag || tflag || vflag)
 112                 scanfiles(argv, 1);
 113         else
 114                 scanfiles(argv, 0);
 115         if (fclose(stdout))
 116                 err(1, "stdout");
 117         exit(rval);
 118         /* NOTREACHED */
 119 }
 120
 121 static void
 122 scanfiles(char **argv, int cooked)
 123 {
 124         char *path;
 125         FILE *fp;
 126         int fd;
 127         int i;
 128
 129         i = 0;
 130
 131         while ((path = argv[i]) != NULL || i == 0) {
 132                 if (path == NULL || strcmp(path, "-") == 0) {
 133                         filename = "stdin";
 134                         fd = STDIN_FILENO;
 135                 } else {
 136                         filename = path;
 137                         fd = open(path, O_RDONLY);
 138 #ifndef NO_UDOM_SUPPORT
 139                         if (fd < 0 && errno == EOPNOTSUPP)
 140                                 fd = udom_open(path, O_RDONLY);
 141 #endif
 142                 }
 143                 if (fd < 0) {
 144                         warn("%s", path);
 145                         rval = 1;
 146                 } else if (cooked) {
 147                         if (fd == STDIN_FILENO) {
 148                                 cook_cat(stdin);
 149                         } else {
 150                                 fp = fdopen(fd, "r");
 151                                 if (fp == NULL)
 152                                         err(1, "%s", path);
 153                                 cook_cat(fp);
 154                                 fclose(fp);
 155                         }
 156                 } else {
 157                         raw_cat(fd);
 158                         if (fd != STDIN_FILENO)
 159                                 close(fd);
 160                 }
 161                 if (path == NULL)
 162                         break;
 163                 ++i;
 164         }
 165 }
 166
 167 static void
 168 cook_cat(FILE *fp)
 169 {
 170         int ch, gobble, line, prev;
 171
 172         /* Reset EOF condition on stdin. */
 173         if (fp == stdin && feof(stdin))
 174                 clearerr(stdin);
 175
 176         line = gobble = 0;
 177         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 178                 if (prev == '\n') {
 179                         if (sflag) {
 180                                 if (ch == '\n') {
 181                                         if (gobble)
 182                                                 continue;
 183                                         gobble = 1;
 184                                 } else
 185                                         gobble = 0;
 186                         }
 187                         if (nflag && (!bflag || ch != '\n')) {
 188                                 fprintf(stdout, "%6d\t", ++line);
 189                                 if (ferror(stdout))
 190                                         break;
 191                         }
 192                 }
 193                 if (ch == '\n') {
 194                         if (eflag && putchar('$') == EOF)
 195                                 break;
 196                 } else if (ch == '\t') {
 197                         if (tflag) {
 198                                 if (putchar('^') == EOF || putchar('I') == EOF)
 199                                         break;
 200                                 continue;
 201                         }
 202                 } else if (vflag) {
 203                         if (!isascii(ch) && !isprint(ch)) {
 204                                 if (putchar('M') == EOF || putchar('-') == EOF)
 205                                         break;
 206                                 ch = toascii(ch);
 207                         }
 208                         if (iscntrl(ch)) {
 209                                 if (putchar('^') == EOF ||
 210                                     putchar(ch == '\177' ? '?' :
 211                                     ch | 0100) == EOF)
 212                                         break;
 213                                 continue;
 214                         }
 215                 }
 216                 if (putchar(ch) == EOF)
 217                         break;
 218         }
 219         if (ferror(fp)) {
 220                 warn("%s", filename);
 221                 rval = 1;
 222                 clearerr(fp);
 223         }
 224         if (ferror(stdout))
 225                 err(1, "stdout");
 226 }
 227
 228 static void
 229 raw_cat(int rfd)
 230 {
 231         int off;
 232         size_t nbsize;
 233         ssize_t nr, nw;
 234         struct stat rst;
 235         static struct stat ost;
 236         static size_t bsize;
 237         static char *buf;
 238
 239         /*
 240          * Figure out the block size to use.  Use the larger of stdout vs
 241          * the passed descriptor.  The minimum blocksize we use is BUFSIZ.
 242          */
 243         if (ost.st_blksize == 0) {
 244                 if (fstat(STDOUT_FILENO, &ost))
 245                         err(1, "<stdout>");
 246                 if (ost.st_blksize < BUFSIZ)
 247                         ost.st_blksize = BUFSIZ;
 248         }
 249         /*
 250          * note: rst.st_blksize can be 0, but it is handled ok.
 251          */
 252         if (fstat(rfd, &rst))
 253                 err(1, "%s", filename);
 254
 255         nbsize = MAX(ost.st_blksize, rst.st_blksize);
 256         if (bsize != nbsize) {
 257                 bsize = nbsize;
 258                 if ((buf = realloc(buf, bsize)) == NULL)
 259                         err(1, "malloc failed");
 260         }
 261         while ((nr = read(rfd, buf, bsize)) > 0) {
 262                 for (off = 0; nr; nr -= nw, off += nw) {
 263                         nw = write(STDOUT_FILENO, buf + off, nr);
 264                         if (nw < 0)
 265                                 err(1, "stdout");
 266                 }
 267         }
 268         if (nr < 0) {
 269                 warn("%s", filename);
 270                 rval = 1;
 271         }
 272 }
 273
 274 #ifndef NO_UDOM_SUPPORT
 275
 276 static int
 277 udom_open(const char *path, int flags)
 278 {
 279         struct sockaddr_un sou;
 280         int fd;
 281         unsigned int len;
 282
 283         bzero(&sou, sizeof(sou));
 284
 285         /*
 286          * Construct the unix domain socket address and attempt to connect
 287          */
 288         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 289         if (fd >= 0) {
 290                 sou.sun_family = AF_UNIX;
 291                 if ((len = strlcpy(sou.sun_path, path,
 292                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
 293                         errno = ENAMETOOLONG;
 294                         return (-1);
 295                 }
 296                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
 297
 298                 if (connect(fd, (void *)&sou, len) < 0) {
 299                         close(fd);
 300                         fd = -1;
 301                 }
 302         }
 303
 304         /*
 305          * handle the open flags by shutting down appropriate directions
 306          */
 307         if (fd >= 0) {
 308                 switch (flags & O_ACCMODE) {
 309                 case O_RDONLY:
 310                         if (shutdown(fd, SHUT_WR) == -1)
 311                                 warn(NULL);
 312                         break;
 313                 case O_WRONLY:
 314                         if (shutdown(fd, SHUT_RD) == -1)
 315                                 warn(NULL);
 316                         break;
 317                 default:
 318                         break;
 319                 }
 320         }
 321         return(fd);
 322 }
 323
 324 #endif