| Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 1 | /* |
| 2 | * cat replacement |
| 3 | * |
| 4 | * no options - the way cat was intended |
| 5 | */ |
| 6 | |
| Jari Aalto | 3185942 | 2009-01-12 13:36:28 +0000 | [diff] [blame] | 7 | /* |
| 8 | Copyright (C) 1999-2009 Free Software Foundation, Inc. |
| 9 | |
| 10 | This file is part of GNU Bash. |
| 11 | Bash is free software: you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation, either version 3 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | Bash is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
| 23 | */ |
| 24 | |
| Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 25 | #include <fcntl.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #include "builtins.h" |
| 29 | #include "shell.h" |
| 30 | |
| 31 | #ifndef errno |
| Ricardo Cerqueira | a02fbff | 2013-07-25 22:35:34 +0100 | [diff] [blame] | 32 | #include <errno.h> |
| Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 33 | #endif |
| 34 | |
| 35 | extern char *strerror (); |
| 36 | extern char **make_builtin_argv (); |
| 37 | |
| 38 | static int |
| 39 | fcopy(fd) |
| 40 | int fd; |
| 41 | { |
| 42 | char buf[1024], *s; |
| 43 | int n, w, e; |
| 44 | |
| 45 | while (n = read(fd, buf, sizeof (buf))) { |
| 46 | w = write(1, buf, n); |
| 47 | if (w != n) { |
| 48 | e = errno; |
| 49 | write(2, "cat: write error: ", 18); |
| 50 | s = strerror(e); |
| 51 | write(2, s, strlen(s)); |
| 52 | write(2, "\n", 1); |
| 53 | return 1; |
| 54 | } |
| 55 | } |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | cat_main (argc, argv) |
| 60 | int argc; |
| 61 | char **argv; |
| 62 | { |
| 63 | int i, fd, r; |
| 64 | char *s; |
| 65 | |
| 66 | if (argc == 1) |
| 67 | return (fcopy(0)); |
| 68 | |
| 69 | for (i = r = 1; i < argc; i++) { |
| 70 | if (argv[i][0] == '-' && argv[i][1] == '\0') |
| 71 | fd = 0; |
| 72 | else { |
| 73 | fd = open(argv[i], O_RDONLY, 0666); |
| 74 | if (fd < 0) { |
| 75 | s = strerror(errno); |
| 76 | write(2, "cat: cannot open ", 17); |
| 77 | write(2, argv[i], strlen(argv[i])); |
| 78 | write(2, ": ", 2); |
| 79 | write(2, s, strlen(s)); |
| 80 | write(2, "\n", 1); |
| 81 | continue; |
| 82 | } |
| 83 | } |
| 84 | r = fcopy(fd); |
| 85 | if (fd != 0) |
| 86 | close(fd); |
| 87 | } |
| 88 | return (r); |
| 89 | } |
| 90 | |
| 91 | cat_builtin(list) |
| 92 | WORD_LIST *list; |
| 93 | { |
| 94 | char **v; |
| 95 | int c, r; |
| 96 | |
| 97 | v = make_builtin_argv(list, &c); |
| 98 | r = cat_main(c, v); |
| 99 | free(v); |
| 100 | |
| 101 | return r; |
| 102 | } |
| 103 | |
| 104 | char *cat_doc[] = { |
| Jari Aalto | 3185942 | 2009-01-12 13:36:28 +0000 | [diff] [blame] | 105 | "Display files.", |
| 106 | "", |
| Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 107 | "Read each FILE and display it on the standard output. If any", |
| 108 | "FILE is `-' or if no FILE argument is given, the standard input", |
| 109 | "is read.", |
| 110 | (char *)0 |
| 111 | }; |
| 112 | |
| 113 | struct builtin cat_struct = { |
| 114 | "cat", |
| 115 | cat_builtin, |
| 116 | BUILTIN_ENABLED, |
| 117 | cat_doc, |
| 118 | "cat [-] [file ...]", |
| 119 | 0 |
| 120 | }; |