text_cmds/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: src/bin/cat/cat.c,v 1.32 2005/01/10 08:39:20 imp Exp $");
  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 #endif
  56
  57 #include <ctype.h>
  58 #include <err.h>
  59 #include <fcntl.h>
  60 #include <locale.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <stddef.h>
  66
  67 int bflag, eflag, nflag, sflag, tflag, vflag;
  68 int rval;
  69 const char *filename;
  70
  71 static void usage(void);
  72 static void scanfiles(char *argv[], int cooked);
  73 static void cook_cat(FILE *);
  74 static void raw_cat(int);
  75
  76 #ifndef NO_UDOM_SUPPORT
  77 static int udom_open(const char *path, int flags);
  78 #endif
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         int ch;
  84
  85         setlocale(LC_CTYPE, "");
  86
  87         while ((ch = getopt(argc, argv, "benstuv")) != -1)
  88                 switch (ch) {
  89                 case 'b':
  90                         bflag = nflag = 1;      /* -b implies -n */
  91                         break;
  92                 case 'e':
  93                         eflag = vflag = 1;      /* -e implies -v */
  94                         break;
  95                 case 'n':
  96                         nflag = 1;
  97                         break;
  98                 case 's':
  99                         sflag = 1;
 100                         break;
 101                 case 't':
 102                         tflag = vflag = 1;      /* -t implies -v */
 103                         break;
 104                 case 'u':
 105                         setbuf(stdout, NULL);
 106                         break;
 107                 case 'v':
 108                         vflag = 1;
 109                         break;
 110                 default:
 111                         usage();
 112                 }
 113         argv += optind;
 114
 115         if (bflag || eflag || nflag || sflag || tflag || vflag)
 116                 scanfiles(argv, 1);
 117         else
 118                 scanfiles(argv, 0);
 119         if (fclose(stdout))
 120                 err(1, "stdout");
 121         exit(rval);
 122         /* NOTREACHED */
 123 }
 124
 125 static void
 126 usage(void)
 127 {
 128         fprintf(stderr, "usage: cat [-benstuv] [file ...]\n");
 129         exit(1);
 130         /* NOTREACHED */
 131 }
 132
 133 static void
 134 scanfiles(char *argv[], int cooked)
 135 {
 136         int i = 0;
 137         char *path;
 138         FILE *fp;
 139
 140         while ((path = argv[i]) != NULL || i == 0) {
 141                 int fd;
 142
 143                 if (path == NULL || strcmp(path, "-") == 0) {
 144                         filename = "stdin";
 145                         fd = STDIN_FILENO;
 146                 } else {
 147                         filename = path;
 148                         fd = open(path, O_RDONLY);
 149 #ifndef NO_UDOM_SUPPORT
 150                         if (fd < 0 && errno == EOPNOTSUPP)
 151                                 fd = udom_open(path, O_RDONLY);
 152 #endif
 153                 }
 154                 if (fd < 0) {
 155                         warn("%s", path);
 156                         rval = 1;
 157                 } else if (cooked) {
 158                         if (fd == STDIN_FILENO)
 159                                 cook_cat(stdin);
 160                         else {
 161                                 fp = fdopen(fd, "r");
 162                                 cook_cat(fp);
 163                                 fclose(fp);
 164                         }
 165                 } else {
 166                         raw_cat(fd);
 167                         if (fd != STDIN_FILENO)
 168                                 close(fd);
 169                 }
 170                 if (path == NULL)
 171                         break;
 172                 ++i;
 173         }
 174 }
 175
 176 static void
 177 cook_cat(FILE *fp)
 178 {
 179         int ch, gobble, line, prev;
 180
 181         /* Reset EOF condition on stdin. */
 182         if (fp == stdin && feof(stdin))
 183                 clearerr(stdin);
 184
 185         line = gobble = 0;
 186         for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
 187                 if (prev == '\n') {
 188                         if (sflag) {
 189                                 if (ch == '\n') {
 190                                         if (gobble)
 191                                                 continue;
 192                                         gobble = 1;
 193                                 } else
 194                                         gobble = 0;
 195                         }
 196                         if (nflag && (!bflag || ch != '\n')) {
 197                                 (void)fprintf(stdout, "%6d\t", ++line);
 198                                 if (ferror(stdout))
 199                                         break;
 200                         }
 201                 }
 202                 if (ch == '\n') {
 203                         if (eflag && putchar('$') == EOF)
 204                                 break;
 205                 } else if (ch == '\t') {
 206                         if (tflag) {
 207                                 if (putchar('^') == EOF || putchar('I') == EOF)
 208                                         break;
 209                                 continue;
 210                         }
 211                 } else if (vflag) {
 212                         if (!isascii(ch) && !isprint(ch)) {
 213                                 if (putchar('M') == EOF || putchar('-') == EOF)
 214                                         break;
 215                                 ch = toascii(ch);
 216                         }
 217                         if (iscntrl(ch)) {
 218                                 if (putchar('^') == EOF ||
 219                                     putchar(ch == '\177' ? '?' :
 220                                     ch | 0100) == EOF)
 221                                         break;
 222                                 continue;
 223                         }
 224                 }
 225                 if (putchar(ch) == EOF)
 226                         break;
 227         }
 228         if (ferror(fp)) {
 229                 warn("%s", filename);
 230                 rval = 1;
 231                 clearerr(fp);
 232         }
 233         if (ferror(stdout))
 234                 err(1, "stdout");
 235 }
 236
 237 static void
 238 raw_cat(int rfd)
 239 {
 240         int off, wfd;
 241         ssize_t nr, nw;
 242         static size_t bsize;
 243         static char *buf = NULL;
 244         struct stat sbuf;
 245
 246         wfd = fileno(stdout);
 247         if (buf == NULL) {
 248                 if (fstat(wfd, &sbuf))
 249                         err(1, "%s", filename);
 250                 bsize = MAX(sbuf.st_blksize, 1024);
 251                 if ((buf = malloc(bsize)) == NULL)
 252                         err(1, "buffer");
 253         }
 254         while ((nr = read(rfd, buf, bsize)) > 0)
 255                 for (off = 0; nr; nr -= nw, off += nw)
 256                         if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
 257                                 err(1, "stdout");
 258         if (nr < 0) {
 259                 warn("%s", filename);
 260                 rval = 1;
 261         }
 262 }
 263
 264 #ifndef NO_UDOM_SUPPORT
 265
 266 static int
 267 udom_open(const char *path, int flags)
 268 {
 269         struct sockaddr_un sou;
 270         int fd;
 271         unsigned int len;
 272
 273         bzero(&sou, sizeof(sou));
 274
 275         /*
 276          * Construct the unix domain socket address and attempt to connect
 277          */
 278         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 279         if (fd >= 0) {
 280                 sou.sun_family = AF_UNIX;
 281                 if ((len = strlcpy(sou.sun_path, path,
 282                     sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
 283                         errno = ENAMETOOLONG;
 284                         return (-1);
 285                 }
 286                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
 287
 288                 if (connect(fd, (void *)&sou, len) < 0) {
 289                         close(fd);
 290                         fd = -1;
 291                 }
 292         }
 293
 294         /*
 295          * handle the open flags by shutting down appropriate directions
 296          */
 297         if (fd >= 0) {
 298                 switch(flags & O_ACCMODE) {
 299                 case O_RDONLY:
 300                         if (shutdown(fd, SHUT_WR) == -1)
 301                                 warn(NULL);
 302                         break;
 303                 case O_WRONLY:
 304                         if (shutdown(fd, SHUT_RD) == -1)
 305                                 warn(NULL);
 306                         break;
 307                 default:
 308                         break;
 309                 }
 310         }
 311         return(fd);
 312 }
 313
 314 #endif