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  * 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 <netdb.h>
  55 #endif
  56
  57 #include <ctype.h>
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <locale.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #include <wchar.h>
  67 #include <wctype.h>
  68
  69 static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
  70 static int rval;
  71 static const char *filename;
  72
  73 static void usage(void) __dead2;
  74 static void scanfiles(char *argv[], int cooked);
  75 static void cook_cat(FILE *);
  76 static void raw_cat(int);
  77
  78 #ifndef NO_UDOM_SUPPORT
  79 static int udom_open(const char *path, int flags);
  80 #endif
  81
  82 /*
  83  * Memory strategy threshold, in pages: if physmem is larger than this,
  84  * use a large buffer.
  85  */
  86 #define PHYSPAGES_THRESHOLD (32 * 1024)
  87
  88 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */
  89 #define BUFSIZE_MAX (2 * 1024 * 1024)
  90
  91 /*
  92  * Small (default) buffer size in bytes. It's inefficient for this to be
  93  * smaller than MAXPHYS.
  94  */
  95 #define BUFSIZE_SMALL (MAXPHYS)
  96
  97 int
  98 main(int argc, char *argv[])
  99 {
 100         int ch;
 101         struct flock stdout_lock;
 102
 103         setlocale(LC_CTYPE, "");
 104
 105         while ((ch = getopt(argc, argv, "belnstuv")) != -1)
 106                 switch (ch) {
 107                 case 'b':
 108                         bflag = nflag = 1;      /* -b implies -n */
 109                         break;
 110                 case 'e':
 111                         eflag = vflag = 1;      /* -e implies -v */
 112                         break;
 113                 case 'l':
 114                         lflag = 1;
 115                         break;
 116                 case 'n':
 117                         nflag = 1;
 118                         break;
 119                 case 's':
 120                         sflag = 1;
 121                         break;
 122                 case 't':
 123                         tflag = vflag = 1;      /* -t implies -v */
 124                         break;
 125                 case 'u':
 126                         setbuf(stdout, NULL);
 127                         break;
 128                 case 'v':
 129                         vflag = 1;
 130                         break;
 131                 default:
 132                         usage();
 133                 }
 134         argv += optind;
 135
 136         if (lflag) {
 137                 stdout_lock.l_len = 0;
 138                 stdout_lock.l_start = 0;
 139                 stdout_lock.l_type = F_WRLCK;
 140                 stdout_lock.l_whence = SEEK_SET;
 141                 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
 142                         err(EXIT_FAILURE, "stdout");
 143         }
 144
 145         if (bflag || eflag || nflag || sflag || tflag || vflag)
 146                 scanfiles(argv, 1);
 147         else
 148                 scanfiles(argv, 0);
 149         if (fclose(stdout))
 150                 err(1, "stdout");
 151         exit(rval);
 152         /* NOTREACHED */
 153 }
 154
 155 static void
 156 usage(void)
 157 {
 158
 159         fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n");
 160         exit(1);
 161         /* NOTREACHED */
 162 }
 163
 164 static void
 165 scanfiles(char *argv[], int cooked)
 166 {
 167         int fd, i;
 168         char *path;
 169         FILE *fp;
 170
 171         i = 0;
 172         fd = -1;
 173         while ((path = argv[i]) != NULL || i == 0) {
 174                 if (path == NULL || strcmp(path, "-") == 0) {
 175                         filename = "stdin";
 176                         fd = STDIN_FILENO;
 177                 } else {
 178                         filename = path;
 179                         fd = open(path, O_RDONLY);
 180 #ifndef NO_UDOM_SUPPORT
 181                         if (fd < 0 && errno == EOPNOTSUPP)
 182                                 fd = udom_open(path, O_RDONLY);
 183 #endif
 184                 }
 185                 if (fd < 0) {
 186                         warn("%s", path);
 187                         rval = 1;
 188                 } else if (cooked) {
 189                         if (fd == STDIN_FILENO)
 190                                 cook_cat(stdin);
 191                         else {
 192                                 fp = fdopen(fd, "r");
 193                                 cook_cat(fp);
 194                                 fclose(fp);
 195                         }
 196                 } else {
 197                         raw_cat(fd);
 198                         if (fd != STDIN_FILENO)
 199                                 close(fd);
 200                 }
 201                 if (path == NULL)
 202                         break;
 203                 ++i;
 204         }
 205 }
 206
 207 static void
 208 cook_cat(FILE *fp)
 209 {
 210         int ch, gobble, line, prev;
 211         wint_t wch;
 212
 213         /* Reset EOF condition on stdin. */
 214         if (fp == stdin && feof(stdin))
 215                 clearerr(stdin);
 216
 217         line = gobble = 0;
 218         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 219                 if (prev == '\n') {
 220                         if (sflag) {
 221                                 if (ch == '\n') {
 222                                         if (gobble)
 223                                                 continue;
 224                                         gobble = 1;
 225                                 } else
 226                                         gobble = 0;
 227                         }
 228                         if (nflag && (!bflag || ch != '\n')) {
 229                                 (void)fprintf(stdout, "%6d\t", ++line);
 230                                 if (ferror(stdout))
 231                                         break;
 232                         }
 233                 }
 234                 if (ch == '\n') {
 235                         if (eflag && putchar('$') == EOF)
 236                                 break;
 237                 } else if (ch == '\t') {
 238                         if (tflag) {
 239                                 if (putchar('^') == EOF || putchar('I') == EOF)
 240                                         break;
 241                                 continue;
 242                         }
 243                 } else if (vflag) {
 244                         (void)ungetc(ch, fp);
 245                         /*
 246                          * Our getwc(3) doesn't change file position
 247                          * on error.
 248                          */
 249                         if ((wch = getwc(fp)) == WEOF) {
 250                                 if (ferror(fp) && errno == EILSEQ) {
 251                                         clearerr(fp);
 252                                         /* Resync attempt. */
 253                                         memset(&fp->_mbstate, 0, sizeof(mbstate_t));
 254                                         if ((ch = getc(fp)) == EOF)
 255                                                 break;
 256                                         wch = ch;
 257                                         goto ilseq;
 258                                 } else
 259                                         break;
 260                         }
 261                         if (!iswascii(wch) && !iswprint(wch)) {
 262 ilseq:
 263                                 if (putchar('M') == EOF || putchar('-') == EOF)
 264                                         break;
 265                                 wch = toascii(wch);
 266                         }
 267                         if (iswcntrl(wch)) {
 268                                 ch = toascii(wch);
 269                                 ch = (ch == '\177') ? '?' : (ch | 0100);
 270                                 if (putchar('^') == EOF || putchar(ch) == EOF)
 271                                         break;
 272                                 continue;
 273                         }
 274                         if (putwchar(wch) == WEOF)
 275                                 break;
 276                         ch = -1;
 277                         continue;
 278                 }
 279                 if (putchar(ch) == EOF)
 280                         break;
 281         }
 282         if (ferror(fp)) {
 283                 warn("%s", filename);
 284                 rval = 1;
 285                 clearerr(fp);
 286         }
 287         if (ferror(stdout))
 288                 err(1, "stdout");
 289 }
 290
 291 static void
 292 raw_cat(int rfd)
 293 {
 294         int off, wfd;
 295         ssize_t nr, nw;
 296         static size_t bsize;
 297         static char *buf = NULL;
 298         struct stat sbuf;
 299
 300         wfd = fileno(stdout);
 301         if (buf == NULL) {
 302                 if (fstat(wfd, &sbuf))
 303                         err(1, "stdout");
 304                 if (S_ISREG(sbuf.st_mode)) {
 305                         /* If there's plenty of RAM, use a large copy buffer */
 306                         if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
 307                                 bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
 308                         else
 309                                 bsize = BUFSIZE_SMALL;
 310                 } else
 311                         bsize = MAX(sbuf.st_blksize,
 312                             (blksize_t)sysconf(_SC_PAGESIZE));
 313                 if ((buf = malloc(bsize)) == NULL)
 314                         err(1, "malloc() failure of IO buffer");
 315         }
 316         while ((nr = read(rfd, buf, bsize)) > 0)
 317                 for (off = 0; nr; nr -= nw, off += nw)
 318                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 319                                 err(1, "stdout");
 320         if (nr < 0) {
 321                 warn("%s", filename);
 322                 rval = 1;
 323         }
 324 }
 325
 326 #ifndef NO_UDOM_SUPPORT
 327
 328 static int
 329 udom_open(const char *path, int flags)
 330 {
 331         struct addrinfo hints, *res, *res0;
 332         char rpath[PATH_MAX];
 333         int fd = -1;
 334         int error;
 335
 336         /*
 337          * Construct the unix domain socket address and attempt to connect.
 338          */
 339         bzero(&hints, sizeof(hints));
 340         hints.ai_family = AF_LOCAL;
 341         if (realpath(path, rpath) == NULL)
 342                 return (-1);
 343         error = getaddrinfo(rpath, NULL, &hints, &res0);
 344         if (error) {
 345                 warn("%s", gai_strerror(error));
 346                 errno = EINVAL;
 347                 return (-1);
 348         }
 349         for (res = res0; res != NULL; res = res->ai_next) {
 350                 fd = socket(res->ai_family, res->ai_socktype,
 351                     res->ai_protocol);
 352                 if (fd < 0) {
 353                         freeaddrinfo(res0);
 354                         return (-1);
 355                 }
 356                 error = connect(fd, res->ai_addr, res->ai_addrlen);
 357                 if (error == 0)
 358                         break;
 359                 else {
 360                         close(fd);
 361                         fd = -1;
 362                 }
 363         }
 364         freeaddrinfo(res0);
 365
 366         /*
 367          * handle the open flags by shutting down appropriate directions
 368          */
 369         if (fd >= 0) {
 370                 switch(flags & O_ACCMODE) {
 371                 case O_RDONLY:
 372                         if (shutdown(fd, SHUT_WR) == -1)
 373                                 warn(NULL);
 374                         break;
 375                 case O_WRONLY:
 376                         if (shutdown(fd, SHUT_RD) == -1)
 377                                 warn(NULL);
 378                         break;
 379                 default:
 380                         break;
 381                 }
 382         }
 383         return (fd);
 384 }
 385
 386 #endif