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6188858ae1
add comments. don't get the length of each arg passed, only the last one. check against == or != NULL rather than using a pointer value as truth test.
94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* ARGSUSED */
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int
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main(int argc __unused, char *argv[])
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{
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int nflag; /* if not set, output a trailing newline. */
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/* This utility may NOT do getopt(3) option parsing. */
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if (*++argv && !strcmp(*argv, "-n")) {
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++argv;
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nflag = 1;
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}
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else
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nflag = 0;
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while (argv[0] != NULL) {
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/*
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* If the next argument is NULL then this is this
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* the last argument, therefore we need to check
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* for a trailing \c.
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*/
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if (argv[1] == NULL) {
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size_t len;
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len = strlen(argv[0]);
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/* is there room for a '\c' and is there one? */
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if (len >= 2 &&
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argv[0][len - 2] == '\\' &&
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argv[0][len - 1] == 'c') {
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/* chop it and set the no-newline flag. */
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argv[0][len - 2] = '\0';
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nflag = 1;
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}
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}
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(void)printf("%s", argv[0]);
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if (*++argv)
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putchar(' ');
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}
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if (!nflag)
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putchar('\n');
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return 0;
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}
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