| 1 | /*-
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| 2 | * Copyright (c) 1989, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kevin Fall.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 4. Neither the name of the University nor the names of its contributors
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| 17 | * may be used to endorse or promote products derived from this software
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| 18 | * without specific prior written permission.
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| 19 | *
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 30 | * SUCH DAMAGE.
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| 31 | */
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| 32 |
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| 33 | #if 0
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| 34 | #ifndef lint
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| 35 | static char const copyright[] =
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| 36 | "@(#) Copyright (c) 1989, 1993\n\
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| 37 | The Regents of the University of California. All rights reserved.\n";
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| 38 | #endif /* not lint */
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| 39 | #endif
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| 40 |
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| 41 | #ifndef lint
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| 42 | #if 0
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| 43 | static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
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| 44 | #endif
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| 45 | #endif /* not lint */
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| 46 | #include <sys/cdefs.h>
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| 47 | __FBSDID("$FreeBSD: src/bin/cat/cat.c,v 1.32 2005/01/10 08:39:20 imp Exp $");
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| 48 |
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| 49 | #include <sys/param.h>
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| 50 | #include <sys/stat.h>
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| 51 | #ifndef NO_UDOM_SUPPORT
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| 52 | #include <sys/socket.h>
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| 53 | #include <sys/un.h>
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| 54 | #include <errno.h>
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| 55 | #endif
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| 56 |
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| 57 | #include <ctype.h>
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| 58 | #include <err.h>
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| 59 | #include <fcntl.h>
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| 60 | #include <locale.h>
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| 61 | #include <stdio.h>
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| 62 | #include <stdlib.h>
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| 63 | #include <string.h>
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| 64 | #include <unistd.h>
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| 65 | #include <stddef.h>
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| 66 |
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| 67 | int bflag, eflag, nflag, sflag, tflag, vflag;
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| 68 | int rval;
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| 69 | const char *filename;
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| 70 |
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| 71 | static void usage(void);
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| 72 | static void scanfiles(char *argv[], int cooked);
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| 73 | static void cook_cat(FILE *);
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| 74 | static void raw_cat(int);
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| 75 |
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| 76 | #ifndef NO_UDOM_SUPPORT
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| 77 | static int udom_open(const char *path, int flags);
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| 78 | #endif
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| 79 |
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| 80 | int
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| 81 | main(int argc, char *argv[])
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| 82 | {
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| 83 | int ch;
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| 84 |
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| 85 | setlocale(LC_CTYPE, "");
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| 86 |
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| 87 | while ((ch = getopt(argc, argv, "benstuv")) != -1)
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| 88 | switch (ch) {
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| 89 | case 'b':
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| 90 | bflag = nflag = 1; /* -b implies -n */
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| 91 | break;
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| 92 | case 'e':
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| 93 | eflag = vflag = 1; /* -e implies -v */
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| 94 | break;
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| 95 | case 'n':
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| 96 | nflag = 1;
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| 97 | break;
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| 98 | case 's':
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| 99 | sflag = 1;
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| 100 | break;
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| 101 | case 't':
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| 102 | tflag = vflag = 1; /* -t implies -v */
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| 103 | break;
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| 104 | case 'u':
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| 105 | setbuf(stdout, NULL);
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| 106 | break;
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| 107 | case 'v':
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| 108 | vflag = 1;
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| 109 | break;
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| 110 | default:
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| 111 | usage();
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| 112 | }
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| 113 | argv += optind;
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| 114 |
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| 115 | if (bflag || eflag || nflag || sflag || tflag || vflag)
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| 116 | scanfiles(argv, 1);
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| 117 | else
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| 118 | scanfiles(argv, 0);
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| 119 | if (fclose(stdout))
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| 120 | err(1, "stdout");
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| 121 | exit(rval);
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| 122 | /* NOTREACHED */
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| 123 | }
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| 124 |
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| 125 | static void
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| 126 | usage(void)
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| 127 | {
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| 128 | fprintf(stderr, "usage: cat [-benstuv] [file ...]\n");
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| 129 | exit(1);
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| 130 | /* NOTREACHED */
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| 131 | }
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| 132 |
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| 133 | static void
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| 134 | scanfiles(char *argv[], int cooked)
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| 135 | {
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| 136 | int i = 0;
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| 137 | char *path;
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| 138 | FILE *fp;
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| 139 |
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| 140 | while ((path = argv[i]) != NULL || i == 0) {
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| 141 | int fd;
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| 142 |
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| 143 | if (path == NULL || strcmp(path, "-") == 0) {
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| 144 | filename = "stdin";
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| 145 | fd = STDIN_FILENO;
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| 146 | } else {
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| 147 | filename = path;
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| 148 | fd = open(path, O_RDONLY);
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| 149 | #ifndef NO_UDOM_SUPPORT
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| 150 | if (fd < 0 && errno == EOPNOTSUPP)
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| 151 | fd = udom_open(path, O_RDONLY);
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| 152 | #endif
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| 153 | }
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| 154 | if (fd < 0) {
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| 155 | warn("%s", path);
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| 156 | rval = 1;
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| 157 | } else if (cooked) {
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| 158 | if (fd == STDIN_FILENO)
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| 159 | cook_cat(stdin);
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| 160 | else {
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| 161 | fp = fdopen(fd, "r");
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| 162 | cook_cat(fp);
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| 163 | fclose(fp);
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| 164 | }
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| 165 | } else {
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| 166 | raw_cat(fd);
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| 167 | if (fd != STDIN_FILENO)
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| 168 | close(fd);
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| 169 | }
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| 170 | if (path == NULL)
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| 171 | break;
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| 172 | ++i;
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | static void
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| 177 | cook_cat(FILE *fp)
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| 178 | {
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| 179 | int ch, gobble, line, prev;
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| 180 |
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| 181 | /* Reset EOF condition on stdin. */
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| 182 | if (fp == stdin && feof(stdin))
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| 183 | clearerr(stdin);
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| 184 |
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| 185 | line = gobble = 0;
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| 186 | for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
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| 187 | if (prev == '\n') {
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| 188 | if (sflag) {
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| 189 | if (ch == '\n') {
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| 190 | if (gobble)
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| 191 | continue;
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| 192 | gobble = 1;
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| 193 | } else
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| 194 | gobble = 0;
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| 195 | }
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| 196 | if (nflag && (!bflag || ch != '\n')) {
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| 197 | (void)fprintf(stdout, "%6d\t", ++line);
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| 198 | if (ferror(stdout))
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| 199 | break;
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| 200 | }
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| 201 | }
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| 202 | if (ch == '\n') {
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| 203 | if (eflag && putchar('$') == EOF)
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| 204 | break;
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| 205 | } else if (ch == '\t') {
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| 206 | if (tflag) {
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| 207 | if (putchar('^') == EOF || putchar('I') == EOF)
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| 208 | break;
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| 209 | continue;
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| 210 | }
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| 211 | } else if (vflag) {
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| 212 | if (!isascii(ch) && !isprint(ch)) {
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| 213 | if (putchar('M') == EOF || putchar('-') == EOF)
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| 214 | break;
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| 215 | ch = toascii(ch);
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| 216 | }
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| 217 | if (iscntrl(ch)) {
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| 218 | if (putchar('^') == EOF ||
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| 219 | putchar(ch == '\177' ? '?' :
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| 220 | ch | 0100) == EOF)
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| 221 | break;
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| 222 | continue;
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| 223 | }
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| 224 | }
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| 225 | if (putchar(ch) == EOF)
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| 226 | break;
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| 227 | }
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| 228 | if (ferror(fp)) {
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| 229 | warn("%s", filename);
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| 230 | rval = 1;
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| 231 | clearerr(fp);
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| 232 | }
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| 233 | if (ferror(stdout))
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| 234 | err(1, "stdout");
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| 235 | }
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| 236 |
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| 237 | static void
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| 238 | raw_cat(int rfd)
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| 239 | {
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| 240 | int off, wfd;
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| 241 | ssize_t nr, nw;
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| 242 | static size_t bsize;
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| 243 | static char *buf = NULL;
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| 244 | struct stat sbuf;
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| 245 |
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| 246 | wfd = fileno(stdout);
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| 247 | if (buf == NULL) {
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| 248 | if (fstat(wfd, &sbuf))
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| 249 | err(1, "%s", filename);
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| 250 | bsize = MAX(sbuf.st_blksize, 1024);
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| 251 | if ((buf = malloc(bsize)) == NULL)
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| 252 | err(1, "buffer");
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| 253 | }
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| 254 | while ((nr = read(rfd, buf, bsize)) > 0)
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| 255 | for (off = 0; nr; nr -= nw, off += nw)
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| 256 | if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
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| 257 | err(1, "stdout");
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| 258 | if (nr < 0) {
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| 259 | warn("%s", filename);
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| 260 | rval = 1;
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| 261 | }
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| 262 | }
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| 263 |
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| 264 | #ifndef NO_UDOM_SUPPORT
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| 265 |
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| 266 | static int
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| 267 | udom_open(const char *path, int flags)
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| 268 | {
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| 269 | struct sockaddr_un sou;
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| 270 | int fd;
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| 271 | unsigned int len;
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| 272 |
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| 273 | bzero(&sou, sizeof(sou));
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| 274 |
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| 275 | /*
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| 276 | * Construct the unix domain socket address and attempt to connect
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| 277 | */
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| 278 | fd = socket(AF_UNIX, SOCK_STREAM, 0);
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| 279 | if (fd >= 0) {
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| 280 | sou.sun_family = AF_UNIX;
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| 281 | if ((len = strlcpy(sou.sun_path, path,
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| 282 | sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) {
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| 283 | errno = ENAMETOOLONG;
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| 284 | return (-1);
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| 285 | }
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| 286 | len = offsetof(struct sockaddr_un, sun_path[len+1]);
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| 287 |
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| 288 | if (connect(fd, (void *)&sou, len) < 0) {
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| 289 | close(fd);
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| 290 | fd = -1;
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| 291 | }
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| 292 | }
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| 293 |
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| 294 | /*
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| 295 | * handle the open flags by shutting down appropriate directions
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| 296 | */
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| 297 | if (fd >= 0) {
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| 298 | switch(flags & O_ACCMODE) {
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| 299 | case O_RDONLY:
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| 300 | if (shutdown(fd, SHUT_WR) == -1)
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| 301 | warn(NULL);
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| 302 | break;
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| 303 | case O_WRONLY:
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| 304 | if (shutdown(fd, SHUT_RD) == -1)
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| 305 | warn(NULL);
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| 306 | break;
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| 307 | default:
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| 308 | break;
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| 309 | }
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| 310 | }
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| 311 | return(fd);
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| 312 | }
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| 313 |
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| 314 | #endif
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