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/*
* echo.c - echo arguments to stdout or into a file
*
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
*
*/
#include <common.h>
#include <command.h>
#include <fs.h>
#include <fcntl.h>
#include <errno.h>
#include <libbb.h>
static int do_echo(int argc, char *argv[])
{
int i, optind = 1;
int fd = stdout, opt, newline = 1;
char *file = NULL;
int oflags = O_WRONLY | O_CREAT;
char str[CONFIG_CBSIZE];
int process_escape = 0;
/* We can't use getopt() here because we want to
* echo all things we don't understand.
*/
while (optind < argc && *argv[optind] == '-') {
if (!*(argv[optind] + 1) || *(argv[optind] + 2))
break;
opt = *(argv[optind] + 1);
switch (opt) {
case 'n':
newline = 0;
break;
case 'a':
oflags |= O_APPEND;
if (optind + 1 < argc)
file = argv[optind + 1];
else
goto no_optarg_out;
optind++;
break;
case 'o':
oflags |= O_TRUNC;
if (optind + 1 < argc)
file = argv[optind + 1];
else
goto no_optarg_out;
optind++;
break;
case 'e':
process_escape = IS_ENABLED(CONFIG_CMD_ECHO_E);
break;
default:
goto exit_parse;
}
optind++;
}
exit_parse:
if (file) {
fd = open(file, oflags);
if (fd < 0) {
perror("open");
return 1;
}
}
for (i = optind; i < argc; i++) {
if (i > optind)
fputc(fd, ' ');
if (process_escape) {
process_escape_sequence(argv[i], str, CONFIG_CBSIZE);
fputs(fd, str);
} else {
fputs(fd, argv[i]);
}
}
if (newline)
fputc(fd, '\n');
if (file)
close(fd);
return 0;
no_optarg_out:
printf("option requires an argument -- %c\n", opt);
return 1;
}
BAREBOX_CMD_HELP_START(echo)
BAREBOX_CMD_HELP_USAGE("echo [OPTIONS] [STRING]\n")
BAREBOX_CMD_HELP_SHORT("Display a line of text.\n")
BAREBOX_CMD_HELP_OPT ("-n", "do not output the trailing newline\n")
BAREBOX_CMD_HELP_OPT ("-a <file>", "instead of outputting to stdout append to <file>\n")
BAREBOX_CMD_HELP_OPT ("-o <file>", "instead of outputting to stdout overwrite <file>\n")
BAREBOX_CMD_HELP_OPT ("-e", "recognize escape sequences\n")
BAREBOX_CMD_HELP_END
/**
* @page echo_command
\todo Add documentation for -a, -o and -e.
*/
BAREBOX_CMD_START(echo)
.cmd = do_echo,
.usage = "echo args to console",
BAREBOX_CMD_HELP(cmd_echo_help)
BAREBOX_CMD_END
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