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Commit	Line	Data
	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	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if 0
	31	#ifndef lint
	32	static char const copyright[] =
	33	"@(#) Copyright (c) 1989, 1993\n\
	34	The Regents of the University of California. All rights reserved.\n";
	35	#endif /* not lint */
	36
	37	#ifndef lint
	38	static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
	39	#endif /* not lint */
	40	#endif
	41	#include <sys/cdefs.h>
	42	__FBSDID("$FreeBSD: src/bin/echo/echo.c,v 1.18 2005/01/10 08:39:22 imp Exp $");
	43
	44	#include <sys/types.h>
	45	#include <sys/uio.h>
	46
	47	#include <assert.h>
	48	#include <errno.h>
	49	#include <limits.h>
	50	#include <stdlib.h>
	51	#include <string.h>
	52	#include <unistd.h>
	53
	54	/*
	55	* Report an error and exit.
	56	* Use it instead of err(3) to avoid linking-in stdio.
	57	*/
	58	static void
	59	errexit(const char prog, const char reason)
	60	{
	61	char *errstr = strerror(errno);
	62	write(STDERR_FILENO, prog, strlen(prog));
	63	write(STDERR_FILENO, ": ", 2);
	64	write(STDERR_FILENO, reason, strlen(reason));
	65	write(STDERR_FILENO, ": ", 2);
	66	write(STDERR_FILENO, errstr, strlen(errstr));
	67	write(STDERR_FILENO, "\n", 1);
	68	exit(1);
	69	}
	70
	71	int
	72	main(int argc, char *argv[])
	73	{
	74	int nflag; /* if not set, output a trailing newline. */
	75	int veclen; /* number of writev arguments. */
	76	struct iovec iov, vp; /* Elements to write, current element. */
	77	char space[] = " ";
	78	char newline[] = "\n";
	79	char *progname = argv[0];
	80
	81	/* This utility may NOT do getopt(3) option parsing. */
	82	if (++argv && !strcmp(argv, "-n")) {
	83	++argv;
	84	--argc;
	85	nflag = 1;
	86	} else
	87	nflag = 0;
	88
	89	veclen = (argc >= 2) ? (argc - 2) * 2 + 1 : 0;
	90
	91	if ((vp = iov = malloc((veclen + 1) * sizeof(struct iovec))) == NULL)
	92	errexit(progname, "malloc");
	93
	94	while (argv[0] != NULL) {
	95	size_t len;
	96
	97	len = strlen(argv[0]);
	98
	99	/*
	100	* If the next argument is NULL then this is this
	101	* the last argument, therefore we need to check
	102	* for a trailing \c.
	103	*/
	104	if (argv[1] == NULL) {
	105	/* is there room for a '\c' and is there one? */
	106	if (len >= 2 &&
	107	argv[0][len - 2] == '\\' &&
	108	argv[0][len - 1] == 'c') {
	109	/* chop it and set the no-newline flag. */
	110	len -= 2;
	111	nflag = 1;
	112	}
	113	}
	114	vp->iov_base = *argv;
	115	vp++->iov_len = len;
	116	if (*++argv) {
	117	vp->iov_base = space;
	118	vp++->iov_len = 1;
	119	}
	120	}
	121	if (!nflag) {
	122	veclen++;
	123	vp->iov_base = newline;
	124	vp++->iov_len = 1;
	125	}
	126	/* assert(veclen == (vp - iov)); */
	127	while (veclen) {
	128	int nwrite;
	129
	130	nwrite = (veclen > IOV_MAX) ? IOV_MAX : veclen;
	131	if (writev(STDOUT_FILENO, iov, nwrite) == -1)
	132	errexit(progname, "write");
	133	iov += nwrite;
	134	veclen -= nwrite;
	135	}
	136	return 0;
	137	}