scoutos / prex-0.9.0 / usr / bin / cat / cat.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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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 | * 3. 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 | |||
33 | /* modified by Kohsuke Ohtani for Prex. */
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34 | |||
35 | #include <sys/stat.h> |
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36 | #include <sys/fcntl.h> |
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37 | |||
38 | #include <err.h> |
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39 | #include <unistd.h> |
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40 | #include <errno.h> |
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41 | #include <stdio.h> |
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42 | #include <stdlib.h> |
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43 | #include <string.h> |
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44 | |||
45 | #ifdef CMDBOX
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46 | #define main(argc, argv) cat_main(argc, argv)
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47 | #endif
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48 | |||
49 | static void do_cat(int rfd); |
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50 | |||
51 | static char *stdbuf; |
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52 | static char *filename; |
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53 | static int rval; |
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54 | |||
55 | int
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56 | main(int argc, char *argv[]) |
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57 | { |
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58 | int ch, fd;
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59 | |||
60 | while ((ch = getopt(argc, argv, "")) != -1) |
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61 | switch(ch) {
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62 | case '?': |
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63 | default:
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64 | fprintf(stderr, "usage: cat [-] [file ...]\n");
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65 | exit(1);
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66 | /* NOTREACHED */
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67 | } |
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68 | argv += optind; |
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69 | |||
70 | if ((stdbuf = malloc(BUFSIZ)) == NULL) |
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71 | err(1, NULL); |
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72 | |||
73 | fd = fileno(stdin); |
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74 | filename = "stdin";
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75 | do {
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76 | if (*argv) {
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77 | if (!strcmp(*argv, "-")) |
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78 | fd = fileno(stdin); |
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79 | else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { |
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80 | warn("%s", *argv);
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81 | ++argv; |
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82 | rval = 1;
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83 | continue;
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84 | } |
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85 | filename = *argv++; |
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86 | } |
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87 | do_cat(fd); |
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88 | if (fd != fileno(stdin))
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89 | (void)close(fd);
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90 | } while (*argv);
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91 | free(stdbuf); |
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92 | exit(rval); |
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93 | } |
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94 | |||
95 | static void |
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96 | do_cat(int rfd)
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97 | { |
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98 | int nr, nw, off, wfd;
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99 | struct stat sbuf;
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100 | |||
101 | wfd = fileno(stdout); |
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102 | if (fstat(wfd, &sbuf))
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103 | err(1, "%s", filename); |
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104 | while ((nr = read(rfd, stdbuf, BUFSIZ)) > 0) |
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105 | for (off = 0; nr; nr -= nw, off += nw) |
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106 | if ((nw = write(wfd, stdbuf + off, (size_t)nr)) < 0) |
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107 | err(1, "stdout"); |
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108 | if (nr < 0) { |
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109 | warn("%s @%d", filename, errno);
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110 | rval = 1;
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111 | } |
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112 | } |