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. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)cat.c    8.2 (Berkeley) 4/27/95
  38  * $FreeBSD: src/bin/cat/cat.c,v 1.14.2.8 2002/06/29 05:09:26 tjr Exp $
  39  * $DragonFly: src/bin/cat/cat.c,v 1.16 2007/02/04 21:06:34 pavalos Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/stat.h>
  44 #ifndef NO_UDOM_SUPPORT
  45 #include <sys/socket.h>
  46 #include <sys/un.h>
  47 #include <errno.h>
  48 #endif
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <fcntl.h>
  53 #include <locale.h>
  54 #include <stddef.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 static int bflag, eflag, nflag, sflag, tflag, vflag, rval;
  61 static const char *filename;
  62
  63 static void scanfiles (char **, int);
  64 static void cook_cat (FILE *);
  65 static void raw_cat (int);
  66
  67 #ifndef NO_UDOM_SUPPORT
  68 static int udom_open (const char *path, int flags);
  69 #endif
  70
  71 static void
  72 usage(void)
  73 {
  74         fprintf(stderr,
  75                 "usage: cat [-benstuv] [file ...]\n");
  76         exit(EXIT_FAILURE);
  77 }
  78
  79 int
  80 main(int argc, char **argv)
  81 {
  82         int ch;
  83
  84         setlocale(LC_CTYPE, "");
  85
  86         while ((ch = getopt(argc, argv, "benstuv")) != -1)
  87                 switch (ch) {
  88                 case 'b':
  89                         bflag = nflag = 1;      /* -b implies -n */
  90                         break;
  91                 case 'e':
  92                         eflag = vflag = 1;      /* -e implies -v */
  93                         break;
  94                 case 'n':
  95                         nflag = 1;
  96                         break;
  97                 case 's':
  98                         sflag = 1;
  99                         break;
 100                 case 't':
 101                         tflag = vflag = 1;      /* -t implies -v */
 102                         break;
 103                 case 'u':
 104                         setbuf(stdout, NULL);
 105                         break;
 106                 case 'v':
 107                         vflag = 1;
 108                         break;
 109                 default:
 110                         usage();
 111                         /* NOTREACHED */
 112                 }
 113         argv += optind;
 114
 115         if (bflag || eflag || nflag || sflag || tflag || vflag)
 116                 scanfiles(argv, 1);
 117         else
 118                 scanfiles(argv, 0);
 119         if (fclose(stdout))
 120                 err(1, "stdout");
 121         exit(rval);
 122         /* NOTREACHED */
 123 }
 124
 125 static void
 126 scanfiles(char **argv, int cooked)
 127 {
 128         char *path;
 129         FILE *fp;
 130         int fd;
 131         int i;
 132
 133         i = 0;
 134
 135         while ((path = argv[i]) != NULL || i == 0) {
 136                 if (path == NULL || strcmp(path, "-") == 0) {
 137                         filename = "stdin";
 138                         fd = STDIN_FILENO;
 139                 } else {
 140                         filename = path;
 141                         fd = open(path, O_RDONLY);
 142 #ifndef NO_UDOM_SUPPORT
 143                         if (fd < 0 && errno == EOPNOTSUPP)
 144                                 fd = udom_open(path, O_RDONLY);
 145 #endif
 146                 }
 147                 if (fd < 0) {
 148                         warn("%s", path);
 149                         rval = 1;
 150                 } else if (cooked) {
 151                         if (fd == STDIN_FILENO) {
 152                                 cook_cat(stdin);
 153                         } else {
 154                                 fp = fdopen(fd, "r");
 155                                 if (fp == NULL)
 156                                         err(1, "%s", path);
 157                                 cook_cat(fp);
 158                                 fclose(fp);
 159                         }
 160                 } else {
 161                         raw_cat(fd);
 162                         if (fd != STDIN_FILENO)
 163                                 close(fd);
 164                 }
 165                 if (path == NULL)
 166                         break;
 167                 ++i;
 168         }
 169 }
 170
 171 static void
 172 cook_cat(FILE *fp)
 173 {
 174         int ch, gobble, line, prev;
 175
 176         /* Reset EOF condition on stdin. */
 177         if (fp == stdin && feof(stdin))
 178                 clearerr(stdin);
 179
 180         line = gobble = 0;
 181         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 182                 if (prev == '\n') {
 183                         if (sflag) {
 184                                 if (ch == '\n') {
 185                                         if (gobble)
 186                                                 continue;
 187                                         gobble = 1;
 188                                 } else
 189                                         gobble = 0;
 190                         }
 191                         if (nflag && (!bflag || ch != '\n')) {
 192                                 fprintf(stdout, "%6d\t", ++line);
 193                                 if (ferror(stdout))
 194                                         break;
 195                         }
 196                 }
 197                 if (ch == '\n') {
 198                         if (eflag && putchar('$') == EOF)
 199                                 break;
 200                 } else if (ch == '\t') {
 201                         if (tflag) {
 202                                 if (putchar('^') == EOF || putchar('I') == EOF)
 203                                         break;
 204                                 continue;
 205                         }
 206                 } else if (vflag) {
 207                         if (!isascii(ch) && !isprint(ch)) {
 208                                 if (putchar('M') == EOF || putchar('-') == EOF)
 209                                         break;
 210                                 ch = toascii(ch);
 211                         }
 212                         if (iscntrl(ch)) {
 213                                 if (putchar('^') == EOF ||
 214                                     putchar(ch == '\177' ? '?' :
 215                                     ch | 0100) == EOF)
 216                                         break;
 217                                 continue;
 218                         }
 219                 }
 220                 if (putchar(ch) == EOF)
 221                         break;
 222         }
 223         if (ferror(fp)) {
 224                 warn("%s", filename);
 225                 rval = 1;
 226                 clearerr(fp);
 227         }
 228         if (ferror(stdout))
 229                 err(1, "stdout");
 230 }
 231
 232 static void
 233 raw_cat(int rfd)
 234 {
 235         int off;
 236         size_t nbsize;
 237         ssize_t nr;
 238         ssize_t nw;
 239         struct stat rst;
 240         static struct stat ost;
 241         static size_t bsize;
 242         static char *buf;
 243
 244         /*
 245          * Figure out the block size to use.  Use the larger of stdout vs
 246          * the passed descriptor.  The minimum blocksize we use is BUFSIZ.
 247          */
 248         if (ost.st_blksize == 0) {
 249                 if (fstat(STDOUT_FILENO, &ost))
 250                         err(1, "<stdout>");
 251                 if (ost.st_blksize < BUFSIZ)
 252                         ost.st_blksize = BUFSIZ;
 253         }
 254         /*
 255          * note: rst.st_blksize can be 0, but it is handled ok.
 256          */
 257         if (fstat(rfd, &rst))
 258                 err(1, "%s", filename);
 259
 260         nbsize = MAX(ost.st_blksize, rst.st_blksize);
 261         if (bsize != nbsize) {
 262                 bsize = nbsize;
 263                 if ((buf = realloc(buf, bsize)) == NULL)
 264                         err(1, "malloc failed");
 265         }
 266         while ((nr = read(rfd, buf, bsize)) > 0) {
 267                 for (off = 0; nr; nr -= nw, off += nw) {
 268                         nw = write(STDOUT_FILENO, buf + off, nr);
 269                         if (nw < 0)
 270                                 err(1, "stdout");
 271                 }
 272         }
 273         if (nr < 0) {
 274                 warn("%s", filename);
 275                 rval = 1;
 276         }
 277 }
 278
 279 #ifndef NO_UDOM_SUPPORT
 280
 281 static int
 282 udom_open(const char *path, int flags)
 283 {
 284         struct sockaddr_un sou;
 285         int fd;
 286         unsigned int len;
 287
 288         bzero(&sou, sizeof(sou));
 289
 290         /*
 291          * Construct the unix domain socket address and attempt to connect
 292          */
 293         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 294         if (fd >= 0) {
 295                 sou.sun_family = AF_UNIX;
 296                 if ((len = strlcpy(sou.sun_path, path,
 297                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
 298                         errno = ENAMETOOLONG;
 299                         return (-1);
 300                 }
 301                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
 302
 303                 if (connect(fd, (void *)&sou, len) < 0) {
 304                         close(fd);
 305                         fd = -1;
 306                 }
 307         }
 308
 309         /*
 310          * handle the open flags by shutting down appropriate directions
 311          */
 312         if (fd >= 0) {
 313                 switch (flags & O_ACCMODE) {
 314                 case O_RDONLY:
 315                         if (shutdown(fd, SHUT_WR) == -1)
 316                                 warn(NULL);
 317                         break;
 318                 case O_WRONLY:
 319                         if (shutdown(fd, SHUT_RD) == -1)
 320                                 warn(NULL);
 321                         break;
 322                 default:
 323                         break;
 324                 }
 325         }
 326         return(fd);
 327 }
 328
 329 #endif