bin/cat/cat.c

   1 /* $NetBSD: cat.c,v 1.55 2015/07/25 16:17:01 sevan Exp $        */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kevin Fall.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #if HAVE_NBTOOL_CONFIG_H
  36 #include "nbtool_config.h"
  37 #endif
  38
  39 #include <sys/cdefs.h>
  40 #if !defined(lint)
  41 __COPYRIGHT(
  42 "@(#) Copyright (c) 1989, 1993\
  43  The Regents of the University of California.  All rights reserved.");
  44 #if 0
  45 static char sccsid[] = "@(#)cat.c       8.2 (Berkeley) 4/27/95";
  46 #else
  47 __RCSID("$NetBSD: cat.c,v 1.55 2015/07/25 16:17:01 sevan Exp $");
  48 #endif
  49 #endif /* not lint */
  50
  51 #include <sys/param.h>
  52 #include <sys/stat.h>
  53
  54 #include <ctype.h>
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <locale.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
  65 static size_t bsize;
  66 static int rval;
  67 static const char *filename;
  68
  69 void cook_args(char *argv[]);
  70 void cook_buf(FILE *);
  71 void raw_args(char *argv[]);
  72 void raw_cat(int);
  73
  74 int
  75 main(int argc, char *argv[])
  76 {
  77         int ch;
  78         struct flock stdout_lock;
  79
  80         setprogname(argv[0]);
  81         (void)setlocale(LC_ALL, "");
  82
  83         while ((ch = getopt(argc, argv, "B:beflnstuv")) != -1)
  84                 switch (ch) {
  85                 case 'B':
  86                         bsize = (size_t)strtol(optarg, NULL, 0);
  87                         break;
  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 'f':
  95                         fflag = 1;
  96                         break;
  97                 case 'l':
  98                         lflag = 1;
  99                         break;
 100                 case 'n':
 101                         nflag = 1;
 102                         break;
 103                 case 's':
 104                         sflag = 1;
 105                         break;
 106                 case 't':
 107                         tflag = vflag = 1;      /* -t implies -v */
 108                         break;
 109                 case 'u':
 110                         setbuf(stdout, NULL);
 111                         break;
 112                 case 'v':
 113                         vflag = 1;
 114                         break;
 115                 default:
 116                         (void)fprintf(stderr,
 117                             "Usage: %s [-beflnstuv] [-B bsize] [-] "
 118                             "[file ...]\n", getprogname());
 119                         return EXIT_FAILURE;
 120                 }
 121         argv += optind;
 122
 123         if (lflag) {
 124                 stdout_lock.l_len = 0;
 125                 stdout_lock.l_start = 0;
 126                 stdout_lock.l_type = F_WRLCK;
 127                 stdout_lock.l_whence = SEEK_SET;
 128                 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
 129                         err(EXIT_FAILURE, "stdout");
 130         }
 131
 132         if (bflag || eflag || nflag || sflag || tflag || vflag)
 133                 cook_args(argv);
 134         else
 135                 raw_args(argv);
 136         if (fclose(stdout))
 137                 err(EXIT_FAILURE, "stdout");
 138         return rval;
 139 }
 140
 141 void
 142 cook_args(char **argv)
 143 {
 144         FILE *fp;
 145
 146         fp = stdin;
 147         filename = "stdin";
 148         do {
 149                 if (*argv) {
 150                         if (!strcmp(*argv, "-"))
 151                                 fp = stdin;
 152                         else if ((fp = fopen(*argv,
 153                             fflag ? "rf" : "r")) == NULL) {
 154                                 warn("%s", *argv);
 155                                 rval = EXIT_FAILURE;
 156                                 ++argv;
 157                                 continue;
 158                         }
 159                         filename = *argv++;
 160                 }
 161                 cook_buf(fp);
 162                 if (fp != stdin)
 163                         (void)fclose(fp);
 164                 else
 165                         clearerr(fp);
 166         } while (*argv);
 167 }
 168
 169 void
 170 cook_buf(FILE *fp)
 171 {
 172         int ch, gobble, line, prev;
 173
 174         line = gobble = 0;
 175         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 176                 if (prev == '\n') {
 177                         if (ch == '\n') {
 178                                 if (sflag) {
 179                                         if (!gobble && nflag && !bflag)
 180                                                 (void)fprintf(stdout,
 181                                                         "%6d\t\n", ++line);
 182                                         else if (!gobble && putchar(ch) == EOF)
 183                                                 break;
 184                                         gobble = 1;
 185                                         continue;
 186                                 }
 187                                 if (nflag) {
 188                                         if (!bflag) {
 189                                                 (void)fprintf(stdout,
 190                                                     "%6d\t", ++line);
 191                                                 if (ferror(stdout))
 192                                                         break;
 193                                         } else if (eflag) {
 194                                                 (void)fprintf(stdout,
 195                                                     "%6s\t", "");
 196                                                 if (ferror(stdout))
 197                                                         break;
 198                                         }
 199                                 }
 200                         } else if (nflag) {
 201                                 (void)fprintf(stdout, "%6d\t", ++line);
 202                                 if (ferror(stdout))
 203                                         break;
 204                         }
 205                 }
 206                 gobble = 0;
 207                 if (ch == '\n') {
 208                         if (eflag)
 209                                 if (putchar('$') == EOF)
 210                                         break;
 211                 } else if (ch == '\t') {
 212                         if (tflag) {
 213                                 if (putchar('^') == EOF || putchar('I') == EOF)
 214                                         break;
 215                                 continue;
 216                         }
 217                 } else if (vflag) {
 218                         if (!isascii(ch)) {
 219                                 if (putchar('M') == EOF || putchar('-') == EOF)
 220                                         break;
 221                                 ch = toascii(ch);
 222                         }
 223                         if (iscntrl(ch)) {
 224                                 if (putchar('^') == EOF ||
 225                                     putchar(ch == '\177' ? '?' :
 226                                     ch | 0100) == EOF)
 227                                         break;
 228                                 continue;
 229                         }
 230                 }
 231                 if (putchar(ch) == EOF)
 232                         break;
 233         }
 234         if (ferror(fp)) {
 235                 warn("%s", filename);
 236                 rval = EXIT_FAILURE;
 237                 clearerr(fp);
 238         }
 239         if (ferror(stdout))
 240                 err(EXIT_FAILURE, "stdout");
 241 }
 242
 243 void
 244 raw_args(char **argv)
 245 {
 246         int fd;
 247
 248         fd = fileno(stdin);
 249         filename = "stdin";
 250         do {
 251                 if (*argv) {
 252                         if (!strcmp(*argv, "-")) {
 253                                 fd = fileno(stdin);
 254                                 if (fd < 0)
 255                                         goto skip;
 256                         } else if (fflag) {
 257                                 struct stat st;
 258                                 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
 259                                 if (fd < 0)
 260                                         goto skip;
 261
 262                                 if (fstat(fd, &st) == -1) {
 263                                         close(fd);
 264                                         goto skip;
 265                                 }
 266                                 if (!S_ISREG(st.st_mode)) {
 267                                         close(fd);
 268                                         warnx("%s: not a regular file", *argv);
 269                                         goto skipnomsg;
 270                                 }
 271                         }
 272                         else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
 273 skip:
 274                                 warn("%s", *argv);
 275 skipnomsg:
 276                                 rval = EXIT_FAILURE;
 277                                 ++argv;
 278                                 continue;
 279                         }
 280                         filename = *argv++;
 281                 } else if (fd < 0) {
 282                         err(EXIT_FAILURE, "stdin");
 283                 }
 284                 raw_cat(fd);
 285                 if (fd != fileno(stdin))
 286                         (void)close(fd);
 287         } while (*argv);
 288 }
 289
 290 void
 291 raw_cat(int rfd)
 292 {
 293         static char *buf;
 294         static char fb_buf[BUFSIZ];
 295
 296         ssize_t nr, nw, off;
 297         int wfd;
 298
 299         wfd = fileno(stdout);
 300         if (wfd < 0)
 301                 err(EXIT_FAILURE, "stdout");
 302         if (buf == NULL) {
 303                 struct stat sbuf;
 304
 305                 if (bsize == 0) {
 306                         if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 &&
 307                             (size_t)sbuf.st_blksize > sizeof(fb_buf))
 308                                 bsize = sbuf.st_blksize;
 309                 }
 310                 if (bsize > sizeof(fb_buf)) {
 311                         buf = malloc(bsize);
 312                         if (buf == NULL)
 313                                 warnx("malloc, using %zu buffer", bsize);
 314                 }
 315                 if (buf == NULL) {
 316                         bsize = sizeof(fb_buf);
 317                         buf = fb_buf;
 318                 }
 319         }
 320         while ((nr = read(rfd, buf, bsize)) > 0)
 321                 for (off = 0; nr; nr -= nw, off += nw)
 322                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 323                                 err(EXIT_FAILURE, "stdout");
 324         if (nr < 0) {
 325                 warn("%s", filename);
 326                 rval = EXIT_FAILURE;
 327         }
 328 }