1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char const copyright[] = 37 "@(#) Copyright (c) 1989, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93"; 43 #endif /* not lint */ 44 #endif 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <unistd.h> 49 #include <string.h> 50 51 /* ARGSUSED */ 52 int 53 main(int argc __unused, char *argv[]) 54 { 55 int nflag; /* if not set, output a trailing newline. */ 56 57 /* This utility may NOT do getopt(3) option parsing. */ 58 if (*++argv && !strcmp(*argv, "-n")) { 59 ++argv; 60 nflag = 1; 61 } 62 else 63 nflag = 0; 64 65 while (argv[0] != NULL) { 66 size_t len; 67 68 len = strlen(argv[0]); 69 70 /* 71 * If the next argument is NULL then this is this 72 * the last argument, therefore we need to check 73 * for a trailing \c. 74 */ 75 if (argv[1] == NULL) { 76 /* is there room for a '\c' and is there one? */ 77 if (len >= 2 && 78 argv[0][len - 2] == '\\' && 79 argv[0][len - 1] == 'c') { 80 /* chop it and set the no-newline flag. */ 81 len -= 2; 82 nflag = 1; 83 } 84 } 85 write(STDOUT_FILENO, argv[0], len); 86 if (*++argv) 87 write(STDOUT_FILENO, " ", 1); 88 } 89 if (!nflag) 90 write(STDOUT_FILENO, "\n", 1); 91 return 0; 92 } 93