113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/* $NetBSD: echo.c,v 1.11 2003/08/07 09:05:12 agc Exp $ */
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/*
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__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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#else
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__RCSID("$NetBSD: echo.c,v 1.11 2003/08/07 09:05:12 agc Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <err.h>
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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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#include <unistd.h>
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#include <vis.h>
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int stdout_ok;
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int main(int, char *[]);
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char *printescaped(const char *);
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/* ARGSUSED */
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int
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main(int argc, char *argv[])
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{
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int nflag;
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stdout_ok = isatty(STDOUT_FILENO);
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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) {
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char *n;
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n = printescaped(*argv);
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(void)printf("%s", n);
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free(n);
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if (*++argv)
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(void)putchar(' ');
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}
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if (nflag == 0)
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(void)putchar('\n');
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exit(0);
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/* NOTREACHED */
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}
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char *
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printescaped(const char *src)
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{
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size_t len;
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char *retval;
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len = strlen(src);
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if (len != 0 && SIZE_T_MAX/len <= 4) {
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errx(EXIT_FAILURE, "%s: name too long", src);
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/* NOTREACHED */
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}
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retval = (char *)malloc(4*len+1);
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if (retval != NULL) {
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if (stdout_ok)
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(void)strvis(retval, src, VIS_NL | VIS_CSTYLE);
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else
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(void)strcpy(retval, src);
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return retval;
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} else
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errx(EXIT_FAILURE, "out of memory!");
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/* NOTREACHED */
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}
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