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// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: © 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
/* echo.c - echo arguments to stdout or into a file */
#include <common.h>
#include <command.h>
#include <fs.h>
#include <fcntl.h>
#include <errno.h>
#include <libbb.h>
static void echo_dputc(int fd, char c, bool wide)
{
wchar_t wc;
int n;
if (!wide || fd == 1 || fd == 2) {
dputc(fd, c);
return;
}
n = mbtowc(&wc, &c, 1);
if (n < 0)
return;
write(fd, &wc, sizeof(wchar_t));
}
static void echo_dputs(int fd, const char *s, bool wide)
{
wchar_t *ws;
if (!wide || fd == 1 || fd == 2) {
dputs(fd, s);
return;
}
ws = strdup_char_to_wchar(s);
if (!ws)
return;
write(fd, ws, wcslen(ws) * sizeof(wchar_t));
free(ws);
}
static int do_echo(int argc, char *argv[])
{
int i, optind = 1;
int fd = STDOUT_FILENO, opt, newline = 1;
char *file = NULL;
int oflags = O_WRONLY | O_CREAT;
char str[CONFIG_CBSIZE];
int process_escape = 0;
bool wide = false;
if (IS_ENABLED(CONFIG_PRINTF_WCHAR) && *argv[0] == 'w')
wide = true;
/* 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++) {
const char *out;
if (i > optind)
echo_dputc(fd, ' ', wide);
if (process_escape) {
process_escape_sequence(argv[i], str, CONFIG_CBSIZE);
out = str;
} else {
out = argv[i];
}
echo_dputs(fd, out, wide);
}
if (newline)
echo_dputc(fd, '\n', wide);
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_TEXT("Display a line of TEXT on the console.")
BAREBOX_CMD_HELP_TEXT("")
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-n", "do not output the trailing newline")
BAREBOX_CMD_HELP_OPT ("-e", "recognize escape sequences")
BAREBOX_CMD_HELP_OPT ("-a FILE", "append to FILE instead of using stdout")
BAREBOX_CMD_HELP_OPT ("-o FILE", "overwrite FILE instead of using stdout")
BAREBOX_CMD_HELP_END
static __maybe_unused const char * const echo_aliases[] = { "wecho", NULL};
BAREBOX_CMD_START(echo)
.cmd = do_echo,
#ifdef CONFIG_PRINTF_WCHAR
.aliases = echo_aliases,
#endif
BAREBOX_CMD_DESC("echo args to console")
BAREBOX_CMD_OPTS("[-neao] STRING")
BAREBOX_CMD_GROUP(CMD_GRP_CONSOLE)
BAREBOX_CMD_HELP(cmd_echo_help)
BAREBOX_CMD_END
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