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 #endif
  55
  56 #include <ctype.h>
  57 #include <err.h>
  58 #include <errno.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 #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         while ((path = argv[i]) != NULL || i == 0) {
 173                 if (path == NULL || strcmp(path, "-") == 0) {
 174                         filename = "stdin";
 175                         fd = STDIN_FILENO;
 176                 } else {
 177                         filename = path;
 178                         fd = open(path, O_RDONLY);
 179 #ifndef NO_UDOM_SUPPORT
 180                         if (fd < 0 && errno == EOPNOTSUPP)
 181                                 fd = udom_open(path, O_RDONLY);
 182 #endif
 183                 }
 184                 if (fd < 0) {
 185                         warn("%s", path);
 186                         rval = 1;
 187                 } else if (cooked) {
 188                         if (fd == STDIN_FILENO)
 189                                 cook_cat(stdin);
 190                         else {
 191                                 fp = fdopen(fd, "r");
 192                                 cook_cat(fp);
 193                                 fclose(fp);
 194                         }
 195                 } else {
 196                         raw_cat(fd);
 197                         if (fd != STDIN_FILENO)
 198                                 close(fd);
 199                 }
 200                 if (path == NULL)
 201                         break;
 202                 ++i;
 203         }
 204 }
 205
 206 static void
 207 cook_cat(FILE *fp)
 208 {
 209         int ch, gobble, line, prev;
 210         wint_t wch;
 211
 212         /* Reset EOF condition on stdin. */
 213         if (fp == stdin && feof(stdin))
 214                 clearerr(stdin);
 215
 216         line = gobble = 0;
 217         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 218                 if (prev == '\n') {
 219                         if (sflag) {
 220                                 if (ch == '\n') {
 221                                         if (gobble)
 222                                                 continue;
 223                                         gobble = 1;
 224                                 } else
 225                                         gobble = 0;
 226                         }
 227                         if (nflag && (!bflag || ch != '\n')) {
 228                                 (void)fprintf(stdout, "%6d\t", ++line);
 229                                 if (ferror(stdout))
 230                                         break;
 231                         }
 232                 }
 233                 if (ch == '\n') {
 234                         if (eflag && putchar('$') == EOF)
 235                                 break;
 236                 } else if (ch == '\t') {
 237                         if (tflag) {
 238                                 if (putchar('^') == EOF || putchar('I') == EOF)
 239                                         break;
 240                                 continue;
 241                         }
 242                 } else if (vflag) {
 243                         (void)ungetc(ch, fp);
 244                         /*
 245                          * Our getwc(3) doesn't change file position
 246                          * on error.
 247                          */
 248                         if ((wch = getwc(fp)) == WEOF) {
 249                                 if (ferror(fp) && errno == EILSEQ) {
 250                                         clearerr(fp);
 251                                         /* Resync attempt. */
 252                                         memset(&fp->_mbstate, 0, sizeof(mbstate_t));
 253                                         if ((ch = getc(fp)) == EOF)
 254                                                 break;
 255                                         wch = ch;
 256                                         goto ilseq;
 257                                 } else
 258                                         break;
 259                         }
 260                         if (!iswascii(wch) && !iswprint(wch)) {
 261 ilseq:
 262                                 if (putchar('M') == EOF || putchar('-') == EOF)
 263                                         break;
 264                                 wch = toascii(wch);
 265                         }
 266                         if (iswcntrl(wch)) {
 267                                 ch = toascii(wch);
 268                                 ch = (ch == '\177') ? '?' : (ch | 0100);
 269                                 if (putchar('^') == EOF || putchar(ch) == EOF)
 270                                         break;
 271                                 continue;
 272                         }
 273                         if (putwchar(wch) == WEOF)
 274                                 break;
 275                         ch = -1;
 276                         continue;
 277                 }
 278                 if (putchar(ch) == EOF)
 279                         break;
 280         }
 281         if (ferror(fp)) {
 282                 warn("%s", filename);
 283                 rval = 1;
 284                 clearerr(fp);
 285         }
 286         if (ferror(stdout))
 287                 err(1, "stdout");
 288 }
 289
 290 static void
 291 raw_cat(int rfd)
 292 {
 293         int off, wfd;
 294         ssize_t nr, nw;
 295         static size_t bsize;
 296         static char *buf = NULL;
 297         struct stat sbuf;
 298
 299         wfd = fileno(stdout);
 300         if (buf == NULL) {
 301                 if (fstat(wfd, &sbuf))
 302                         err(1, "stdout");
 303                 if (S_ISREG(sbuf.st_mode)) {
 304                         /* If there's plenty of RAM, use a large copy buffer */
 305                         if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
 306                                 bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
 307                         else
 308                                 bsize = BUFSIZE_SMALL;
 309                 } else
 310                         bsize = MAX(sbuf.st_blksize,
 311                             (blksize_t)sysconf(_SC_PAGESIZE));
 312                 if ((buf = malloc(bsize)) == NULL)
 313                         err(1, "malloc() failure of IO buffer");
 314         }
 315         while ((nr = read(rfd, buf, bsize)) > 0)
 316                 for (off = 0; nr; nr -= nw, off += nw)
 317                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 318                                 err(1, "stdout");
 319         if (nr < 0) {
 320                 warn("%s", filename);
 321                 rval = 1;
 322         }
 323 }
 324
 325 #ifndef NO_UDOM_SUPPORT
 326
 327 static int
 328 udom_open(const char *path, int flags)
 329 {
 330         struct sockaddr_un sou;
 331         int fd;
 332         unsigned int len;
 333
 334         bzero(&sou, sizeof(sou));
 335
 336         /*
 337          * Construct the unix domain socket address and attempt to connect
 338          */
 339         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 340         if (fd >= 0) {
 341                 sou.sun_family = AF_UNIX;
 342                 if ((len = strlcpy(sou.sun_path, path,
 343                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
 344                         errno = ENAMETOOLONG;
 345                         return (-1);
 346                 }
 347                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
 348
 349                 if (connect(fd, (void *)&sou, len) < 0) {
 350                         close(fd);
 351                         fd = -1;
 352                 }
 353         }
 354
 355         /*
 356          * handle the open flags by shutting down appropriate directions
 357          */
 358         if (fd >= 0) {
 359                 switch(flags & O_ACCMODE) {
 360                 case O_RDONLY:
 361                         if (shutdown(fd, SHUT_WR) == -1)
 362                                 warn(NULL);
 363                         break;
 364                 case O_WRONLY:
 365                         if (shutdown(fd, SHUT_RD) == -1)
 366                                 warn(NULL);
 367                         break;
 368                 default:
 369                         break;
 370                 }
 371         }
 372         return (fd);
 373 }
 374
 375 #endif