126 lines
2.5 KiB
C
126 lines
2.5 KiB
C
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/* echo.c - Command to display a line of text */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006 Free Software Foundation, Inc.
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*
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* GRUB is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/arg.h>
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#include <grub/misc.h>
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static const struct grub_arg_option options[] =
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{
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{0, 'n', 0, "do not output the trailing newline", 0, 0},
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{0, 'e', 0, "enable interpretation of backslash escapes", 0, 0},
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{0, 0, 0, 0, 0, 0}
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};
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static grub_err_t
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grub_cmd_echo (struct grub_arg_list *state, int argc, char **args)
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{
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int newline = 1;
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int i;
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/* Check if `-n' was used. */
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if (state[0].set)
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newline = 0;
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for (i = 0; i < argc; i++)
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{
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char *arg = *args;
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args++;
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while (*arg)
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{
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/* In case `-e' is used, parse backslashes. */
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if (*arg == '\\' && state[1].set)
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{
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arg++;
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if (*arg == '\0')
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break;
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switch (*arg)
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{
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case '\\':
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grub_printf ("\\");
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break;
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case 'a':
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grub_printf ("\a");
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break;
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case 'c':
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newline = 0;
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break;
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case 'f':
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grub_printf ("\f");
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break;
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case 'n':
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grub_printf ("\n");
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break;
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case 'r':
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grub_printf ("\r");
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break;
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case 't':
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grub_printf ("\t");
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break;
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case 'v':
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grub_printf ("\v");
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break;
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}
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arg++;
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continue;
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}
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/* This was not an escaped character, or escaping is not
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enabled. */
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grub_printf ("%c", *arg);
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arg++;
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}
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/* If another argument follows, insert a space. */
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if (i != argc - 1)
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grub_printf (" " );
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}
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if (newline)
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grub_printf ("\n");
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return 0;
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}
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GRUB_MOD_INIT(echo)
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{
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(void) mod; /* To stop warning. */
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grub_register_command ("echo", grub_cmd_echo, GRUB_COMMAND_FLAG_BOTH,
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"echo [-e|-n] FILE", "Display a line of text.",
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options);
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}
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GRUB_MOD_FINI(echo)
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{
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grub_unregister_command ("echo");
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}
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