b5ef11025a
* commands/echo.c: New file. * conf/i386-pc.rmk (grub_emu_SOURCES): Add `commands/echo.c'. * conf/common.rmk (echo_mod_SOURCES): New variable. (echo_mod_CFLAGS): Likewise. (echo_mod_LDFLAGS): Likewise.
125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
/* echo.c - Command to display a line of text */
|
||
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2006 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 2 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* This program 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, write to the Free Software
|
||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
*/
|
||
|
||
#include <grub/normal.h>
|
||
#include <grub/dl.h>
|
||
#include <grub/arg.h>
|
||
#include <grub/misc.h>
|
||
|
||
static const struct grub_arg_option options[] =
|
||
{
|
||
{0, 'n', 0, "do not output the trailing newline", 0, 0},
|
||
{0, 'e', 0, "enable interpretation of backslash escapes", 0, 0},
|
||
{0, 0, 0, 0, 0, 0}
|
||
};
|
||
|
||
|
||
static grub_err_t
|
||
grub_cmd_echo (struct grub_arg_list *state, int argc, char **args)
|
||
{
|
||
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;
|
||
}
|
||
|
||
|
||
GRUB_MOD_INIT(echo)
|
||
{
|
||
(void) mod; /* To stop warning. */
|
||
grub_register_command ("echo", grub_cmd_echo, GRUB_COMMAND_FLAG_BOTH,
|
||
"echo [-e|-n] FILE", "Display a line of text.",
|
||
options);
|
||
}
|
||
|
||
GRUB_MOD_FINI(echo)
|
||
{
|
||
grub_unregister_command ("echo");
|
||
}
|