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Commit | Line | Data |
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b5ef1102 | 1 | /* echo.c - Command to display a line of text */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
5a79f472 | 4 | * Copyright (C) 2006,2007 Free Software Foundation, Inc. |
b5ef1102 | 5 | * |
5a79f472 | 6 | * GRUB is free software: you can redistribute it and/or modify |
b5ef1102 | 7 | * it under the terms of the GNU General Public License as published by |
5a79f472 | 8 | * the Free Software Foundation, either version 3 of the License, or |
b5ef1102 | 9 | * (at your option) any later version. |
10 | * | |
5a79f472 | 11 | * GRUB is distributed in the hope that it will be useful, |
b5ef1102 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
5a79f472 | 17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
b5ef1102 | 18 | */ |
19 | ||
b5ef1102 | 20 | #include <grub/dl.h> |
b5ef1102 | 21 | #include <grub/misc.h> |
b1b797cb | 22 | #include <grub/extcmd.h> |
77a79592 | 23 | #include <grub/i18n.h> |
b5ef1102 | 24 | |
25 | static const struct grub_arg_option options[] = | |
26 | { | |
77a79592 | 27 | {0, 'n', 0, N_("Do not output the trailing newline."), 0, 0}, |
28 | {0, 'e', 0, N_("Enable interpretation of backslash escapes."), 0, 0}, | |
b5ef1102 | 29 | {0, 0, 0, 0, 0, 0} |
30 | }; | |
31 | ||
b5ef1102 | 32 | static grub_err_t |
b1b797cb | 33 | grub_cmd_echo (grub_extcmd_t cmd, int argc, char **args) |
b5ef1102 | 34 | { |
b1b797cb | 35 | struct grub_arg_list *state = cmd->state; |
b5ef1102 | 36 | int newline = 1; |
37 | int i; | |
38 | ||
39 | /* Check if `-n' was used. */ | |
40 | if (state[0].set) | |
41 | newline = 0; | |
42 | ||
43 | for (i = 0; i < argc; i++) | |
44 | { | |
45 | char *arg = *args; | |
46 | args++; | |
47 | ||
48 | while (*arg) | |
49 | { | |
50 | /* In case `-e' is used, parse backslashes. */ | |
51 | if (*arg == '\\' && state[1].set) | |
52 | { | |
53 | arg++; | |
54 | if (*arg == '\0') | |
55 | break; | |
56 | ||
57 | switch (*arg) | |
58 | { | |
59 | case '\\': | |
60 | grub_printf ("\\"); | |
61 | break; | |
62 | ||
63 | case 'a': | |
64 | grub_printf ("\a"); | |
65 | break; | |
66 | ||
67 | case 'c': | |
68 | newline = 0; | |
69 | break; | |
70 | ||
71 | case 'f': | |
72 | grub_printf ("\f"); | |
73 | break; | |
74 | ||
75 | case 'n': | |
76 | grub_printf ("\n"); | |
77 | break; | |
78 | ||
79 | case 'r': | |
80 | grub_printf ("\r"); | |
81 | break; | |
82 | ||
83 | case 't': | |
84 | grub_printf ("\t"); | |
85 | break; | |
86 | ||
87 | case 'v': | |
88 | grub_printf ("\v"); | |
89 | break; | |
90 | } | |
91 | arg++; | |
92 | continue; | |
93 | } | |
b39f9d20 | 94 | |
b5ef1102 | 95 | /* This was not an escaped character, or escaping is not |
96 | enabled. */ | |
97 | grub_printf ("%c", *arg); | |
98 | arg++; | |
99 | } | |
100 | ||
101 | /* If another argument follows, insert a space. */ | |
102 | if (i != argc - 1) | |
103 | grub_printf (" " ); | |
104 | } | |
105 | ||
106 | if (newline) | |
107 | grub_printf ("\n"); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
b1b797cb | 112 | static grub_extcmd_t cmd; |
b5ef1102 | 113 | \f |
114 | GRUB_MOD_INIT(echo) | |
115 | { | |
b1b797cb | 116 | cmd = grub_register_extcmd ("echo", grub_cmd_echo, GRUB_COMMAND_FLAG_BOTH, |
77a79592 | 117 | N_("[-e|-n] STRING"), N_("Display a line of text."), |
b1b797cb | 118 | options); |
b5ef1102 | 119 | } |
120 | ||
121 | GRUB_MOD_FINI(echo) | |
122 | { | |
b1b797cb | 123 | grub_unregister_extcmd (cmd); |
b5ef1102 | 124 | } |