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