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