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BVK Chaitanya 2010-05-06 11:34:04 +05:30
parent 265d68cd10
commit 8c41176882
810 changed files with 4980 additions and 2508 deletions
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124
grub-core/commands/echo.c Normal file
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/* echo.c - Command to display a line of text */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
static const struct grub_arg_option options[] =
{
{0, 'n', 0, N_("Do not output the trailing newline."), 0, 0},
{0, 'e', 0, N_("Enable interpretation of backslash escapes."), 0, 0},
{0, 0, 0, 0, 0, 0}
};
static grub_err_t
grub_cmd_echo (grub_extcmd_t cmd, int argc, char **args)
{
struct grub_arg_list *state = cmd->state;
int newline = 1;
int i;
/* Check if `-n' was used. */
if (state[0].set)
newline = 0;
for (i = 0; i < argc; i++)
{
char *arg = *args;
args++;
while (*arg)
{
/* In case `-e' is used, parse backslashes. */
if (*arg == '\\' && state[1].set)
{
arg++;
if (*arg == '\0')
break;
switch (*arg)
{
case '\\':
grub_printf ("\\");
break;
case 'a':
grub_printf ("\a");
break;
case 'c':
newline = 0;
break;
case 'f':
grub_printf ("\f");
break;
case 'n':
grub_printf ("\n");
break;
case 'r':
grub_printf ("\r");
break;
case 't':
grub_printf ("\t");
break;
case 'v':
grub_printf ("\v");
break;
}
arg++;
continue;
}
/* This was not an escaped character, or escaping is not
enabled. */
grub_printf ("%c", *arg);
arg++;
}
/* If another argument follows, insert a space. */
if (i != argc - 1)
grub_printf (" " );
}
if (newline)
grub_printf ("\n");
return 0;
}
static grub_extcmd_t cmd;
GRUB_MOD_INIT(echo)
{
cmd = grub_register_extcmd ("echo", grub_cmd_echo, GRUB_COMMAND_FLAG_BOTH,
N_("[-e|-n] STRING"), N_("Display a line of text."),
options);
}
GRUB_MOD_FINI(echo)
{
grub_unregister_extcmd (cmd);
}