bin/cat/cat.c

   1 /* $NetBSD: cat.c,v 1.47 2008/07/20 00:52:39 lukem 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 1.47 2008/07/20 00:52:39 lukem 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 int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
  65 int rval;
  66 const char *filename;
  67
  68 int main(int, char *[]);
  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, "beflnstuv")) != -1)
  84                 switch (ch) {
  85                 case 'b':
  86                         bflag = nflag = 1;      /* -b implies -n */
  87                         break;
  88                 case 'e':
  89                         eflag = vflag = 1;      /* -e implies -v */
  90                         break;
  91                 case 'f':
  92                         fflag = 1;
  93                         break;
  94                 case 'l':
  95                         lflag = 1;
  96                         break;
  97                 case 'n':
  98                         nflag = 1;
  99                         break;
 100                 case 's':
 101                         sflag = 1;
 102                         break;
 103                 case 't':
 104                         tflag = vflag = 1;      /* -t implies -v */
 105                         break;
 106                 case 'u':
 107                         setbuf(stdout, NULL);
 108                         break;
 109                 case 'v':
 110                         vflag = 1;
 111                         break;
 112                 default:
 113                 case '?':
 114                         (void)fprintf(stderr,
 115                             "usage: cat [-beflnstuv] [-] [file ...]\n");
 116                         exit(EXIT_FAILURE);
 117                         /* NOTREACHED */
 118                 }
 119         argv += optind;
 120
 121         if (lflag) {
 122                 stdout_lock.l_len = 0;
 123                 stdout_lock.l_start = 0;
 124                 stdout_lock.l_type = F_WRLCK;
 125                 stdout_lock.l_whence = SEEK_SET;
 126                 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
 127                         err(EXIT_FAILURE, "stdout");
 128         }
 129
 130         if (bflag || eflag || nflag || sflag || tflag || vflag)
 131                 cook_args(argv);
 132         else
 133                 raw_args(argv);
 134         if (fclose(stdout))
 135                 err(EXIT_FAILURE, "stdout");
 136         return (rval);
 137 }
 138
 139 void
 140 cook_args(char **argv)
 141 {
 142         FILE *fp;
 143
 144         fp = stdin;
 145         filename = "stdin";
 146         do {
 147                 if (*argv) {
 148                         if (!strcmp(*argv, "-"))
 149                                 fp = stdin;
 150                         else if ((fp = fopen(*argv,
 151                             fflag ? "rf" : "r")) == NULL) {
 152                                 warn("%s", *argv);
 153                                 rval = EXIT_FAILURE;
 154                                 ++argv;
 155                                 continue;
 156                         }
 157                         filename = *argv++;
 158                 }
 159                 cook_buf(fp);
 160                 if (fp != stdin)
 161                         (void)fclose(fp);
 162                 else
 163                         clearerr(fp);
 164         } while (*argv);
 165 }
 166
 167 void
 168 cook_buf(FILE *fp)
 169 {
 170         int ch, gobble, line, prev;
 171
 172         line = gobble = 0;
 173         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 174                 if (prev == '\n') {
 175                         if (ch == '\n') {
 176                                 if (sflag) {
 177                                         if (!gobble && nflag && !bflag)
 178                                                 (void)fprintf(stdout,
 179                                                         "%6d\t\n", ++line);
 180                                         else if (!gobble && putchar(ch) == EOF)
 181                                                 break;
 182                                         gobble = 1;
 183                                         continue;
 184                                 }
 185                                 if (nflag) {
 186                                         if (!bflag) {
 187                                                 (void)fprintf(stdout,
 188                                                     "%6d\t", ++line);
 189                                                 if (ferror(stdout))
 190                                                         break;
 191                                         } else if (eflag) {
 192                                                 (void)fprintf(stdout,
 193                                                     "%6s\t", "");
 194                                                 if (ferror(stdout))
 195                                                         break;
 196                                         }
 197                                 }
 198                         } else if (nflag) {
 199                                 (void)fprintf(stdout, "%6d\t", ++line);
 200                                 if (ferror(stdout))
 201                                         break;
 202                         }
 203                 }
 204                 gobble = 0;
 205                 if (ch == '\n') {
 206                         if (eflag)
 207                                 if (putchar('$') == EOF)
 208                                         break;
 209                 } else if (ch == '\t') {
 210                         if (tflag) {
 211                                 if (putchar('^') == EOF || putchar('I') == EOF)
 212                                         break;
 213                                 continue;
 214                         }
 215                 } else if (vflag) {
 216                         if (!isascii(ch)) {
 217                                 if (putchar('M') == EOF || putchar('-') == EOF)
 218                                         break;
 219                                 ch = toascii(ch);
 220                         }
 221                         if (iscntrl(ch)) {
 222                                 if (putchar('^') == EOF ||
 223                                     putchar(ch == '\177' ? '?' :
 224                                     ch | 0100) == EOF)
 225                                         break;
 226                                 continue;
 227                         }
 228                 }
 229                 if (putchar(ch) == EOF)
 230                         break;
 231         }
 232         if (ferror(fp)) {
 233                 warn("%s", filename);
 234                 rval = EXIT_FAILURE;
 235                 clearerr(fp);
 236         }
 237         if (ferror(stdout))
 238                 err(EXIT_FAILURE, "stdout");
 239 }
 240
 241 void
 242 raw_args(char **argv)
 243 {
 244         int fd;
 245
 246         fd = fileno(stdin);
 247         filename = "stdin";
 248         do {
 249                 if (*argv) {
 250                         if (!strcmp(*argv, "-"))
 251                                 fd = fileno(stdin);
 252                         else if (fflag) {
 253                                 struct stat st;
 254                                 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
 255                                 if (fd < 0)
 256                                         goto skip;
 257
 258                                 if (fstat(fd, &st) == -1) {
 259                                         close(fd);
 260                                         goto skip;
 261                                 }
 262                                 if (!S_ISREG(st.st_mode)) {
 263                                         close(fd);
 264                                         warnx("%s: not a regular file", *argv);
 265                                         goto skipnomsg;
 266                                 }
 267                         }
 268                         else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
 269 skip:
 270                                 warn("%s", *argv);
 271 skipnomsg:
 272                                 rval = EXIT_FAILURE;
 273                                 ++argv;
 274                                 continue;
 275                         }
 276                         filename = *argv++;
 277                 }
 278                 raw_cat(fd);
 279                 if (fd != fileno(stdin))
 280                         (void)close(fd);
 281         } while (*argv);
 282 }
 283
 284 void
 285 raw_cat(int rfd)
 286 {
 287         static char *buf;
 288         static char fb_buf[BUFSIZ];
 289         static size_t bsize;
 290
 291         ssize_t nr, nw, off;
 292         int wfd;
 293
 294         wfd = fileno(stdout);
 295         if (buf == NULL) {
 296                 struct stat sbuf;
 297
 298                 if (fstat(wfd, &sbuf) == 0 &&
 299                     sbuf.st_blksize > sizeof(fb_buf)) {
 300                         bsize = sbuf.st_blksize;
 301                         buf = malloc(bsize);
 302                 }
 303                 if (buf == NULL) {
 304                         bsize = sizeof(fb_buf);
 305                         buf = fb_buf;
 306                 }
 307         }
 308         while ((nr = read(rfd, buf, bsize)) > 0)
 309                 for (off = 0; nr; nr -= nw, off += nw)
 310                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 311                                 err(EXIT_FAILURE, "stdout");
 312         if (nr < 0) {
 313                 warn("%s", filename);
 314                 rval = EXIT_FAILURE;
 315         }
 316 }