bin/cat/cat.c

   1 /* $NetBSD: cat.c,v 1.57 2016/06/16 00:52:37 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 1.57 2016/06/16 00:52:37 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                 case '?':
 117                         (void)fprintf(stderr,
 118                             "Usage: %s [-beflnstuv] [-B bsize] [-] "
 119                             "[file ...]\n", getprogname());
 120                         return EXIT_FAILURE;
 121                 }
 122         argv += optind;
 123
 124         if (lflag) {
 125                 stdout_lock.l_len = 0;
 126                 stdout_lock.l_start = 0;
 127                 stdout_lock.l_type = F_WRLCK;
 128                 stdout_lock.l_whence = SEEK_SET;
 129                 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
 130                         err(EXIT_FAILURE, "stdout");
 131         }
 132
 133         if (bflag || eflag || nflag || sflag || tflag || vflag)
 134                 cook_args(argv);
 135         else
 136                 raw_args(argv);
 137         if (fclose(stdout))
 138                 err(EXIT_FAILURE, "stdout");
 139         return rval;
 140 }
 141
 142 void
 143 cook_args(char **argv)
 144 {
 145         FILE *fp;
 146
 147         fp = stdin;
 148         filename = "stdin";
 149         do {
 150                 if (*argv) {
 151                         if (!strcmp(*argv, "-"))
 152                                 fp = stdin;
 153                         else if ((fp = fopen(*argv,
 154                             fflag ? "rf" : "r")) == NULL) {
 155                                 warn("%s", *argv);
 156                                 rval = EXIT_FAILURE;
 157                                 ++argv;
 158                                 continue;
 159                         }
 160                         filename = *argv++;
 161                 }
 162                 cook_buf(fp);
 163                 if (fp != stdin)
 164                         (void)fclose(fp);
 165                 else
 166                         clearerr(fp);
 167         } while (*argv);
 168 }
 169
 170 void
 171 cook_buf(FILE *fp)
 172 {
 173         int ch, gobble, line, prev;
 174
 175         line = gobble = 0;
 176         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 177                 if (prev == '\n') {
 178                         if (sflag) {
 179                                 if (ch == '\n') {
 180                                         if (gobble)
 181                                                 continue;
 182                                         gobble = 1;
 183                                 } else
 184                                         gobble = 0;
 185                                 }
 186                                 if (nflag) {
 187                                         if (!bflag || ch != '\n') {
 188                                                 (void)fprintf(stdout,
 189                                                     "%6d\t", ++line);
 190                                                 if (ferror(stdout))
 191                                                         break;
 192                                         } else if (eflag) {
 193                                                 (void)fprintf(stdout,
 194                                                     "%6s\t", "");
 195                                                 if (ferror(stdout))
 196                                                         break;
 197                                         }
 198                                 }
 199                         }
 200                 if (ch == '\n') {
 201                         if (eflag)
 202                                 if (putchar('$') == EOF)
 203                                         break;
 204                 } else if (ch == '\t') {
 205                         if (tflag) {
 206                                 if (putchar('^') == EOF || putchar('I') == EOF)
 207                                         break;
 208                                 continue;
 209                         }
 210                 } else if (vflag) {
 211                         if (!isascii(ch)) {
 212                                 if (putchar('M') == EOF || putchar('-') == EOF)
 213                                         break;
 214                                 ch = toascii(ch);
 215                         }
 216                         if (iscntrl(ch)) {
 217                                 if (putchar('^') == EOF ||
 218                                     putchar(ch == '\177' ? '?' :
 219                                     ch | 0100) == EOF)
 220                                         break;
 221                                 continue;
 222                         }
 223                 }
 224                 if (putchar(ch) == EOF)
 225                         break;
 226         }
 227         if (ferror(fp)) {
 228                 warn("%s", filename);
 229                 rval = EXIT_FAILURE;
 230                 clearerr(fp);
 231         }
 232         if (ferror(stdout))
 233                 err(EXIT_FAILURE, "stdout");
 234 }
 235
 236 void
 237 raw_args(char **argv)
 238 {
 239         int fd;
 240
 241         fd = fileno(stdin);
 242         filename = "stdin";
 243         do {
 244                 if (*argv) {
 245                         if (!strcmp(*argv, "-")) {
 246                                 fd = fileno(stdin);
 247                                 if (fd < 0)
 248                                         goto skip;
 249                         } else if (fflag) {
 250                                 struct stat st;
 251                                 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
 252                                 if (fd < 0)
 253                                         goto skip;
 254
 255                                 if (fstat(fd, &st) == -1) {
 256                                         close(fd);
 257                                         goto skip;
 258                                 }
 259                                 if (!S_ISREG(st.st_mode)) {
 260                                         close(fd);
 261                                         warnx("%s: not a regular file", *argv);
 262                                         goto skipnomsg;
 263                                 }
 264                         }
 265                         else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
 266 skip:
 267                                 warn("%s", *argv);
 268 skipnomsg:
 269                                 rval = EXIT_FAILURE;
 270                                 ++argv;
 271                                 continue;
 272                         }
 273                         filename = *argv++;
 274                 } else if (fd < 0) {
 275                         err(EXIT_FAILURE, "stdin");
 276                 }
 277                 raw_cat(fd);
 278                 if (fd != fileno(stdin))
 279                         (void)close(fd);
 280         } while (*argv);
 281 }
 282
 283 void
 284 raw_cat(int rfd)
 285 {
 286         static char *buf;
 287         static char fb_buf[BUFSIZ];
 288
 289         ssize_t nr, nw, off;
 290         int wfd;
 291
 292         wfd = fileno(stdout);
 293         if (wfd < 0)
 294                 err(EXIT_FAILURE, "stdout");
 295         if (buf == NULL) {
 296                 struct stat sbuf;
 297
 298                 if (bsize == 0) {
 299                         if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 &&
 300                             (size_t)sbuf.st_blksize > sizeof(fb_buf))
 301                                 bsize = sbuf.st_blksize;
 302                 }
 303                 if (bsize > sizeof(fb_buf)) {
 304                         buf = malloc(bsize);
 305                         if (buf == NULL)
 306                                 warnx("malloc, using %zu buffer", bsize);
 307                 }
 308                 if (buf == NULL) {
 309                         bsize = sizeof(fb_buf);
 310                         buf = fb_buf;
 311                 }
 312         }
 313         while ((nr = read(rfd, buf, bsize)) > 0)
 314                 for (off = 0; nr; nr -= nw, off += nw)
 315                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 316                                 err(EXIT_FAILURE, "stdout");
 317         if (nr < 0) {
 318                 warn("%s", filename);
 319                 rval = EXIT_FAILURE;
 320         }
 321 }