bin/echo/echo.c

   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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)echo.c   8.1 (Berkeley) 5/31/93
  35  * $FreeBSD: src/bin/echo/echo.c,v 1.8.2.1 2001/08/01 02:33:32 obrien Exp $
  36  * $DragonFly: src/bin/echo/echo.c,v 1.8 2005/02/03 23:03:31 joerg Exp $
  37  */
  38 #include <sys/types.h>
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 /* ARGSUSED */
  45 int
  46 main(int argc __unused, char **argv)
  47 {
  48         int nflag = 0;
  49
  50         /* This utility may NOT do getopt(3) option parsing. */
  51         if (*++argv && !strcmp(*argv, "-n")) {
  52                 ++argv;
  53                 nflag = 1;
  54         }
  55
  56         while (argv[0]) {
  57                 size_t len = strlen(argv[0]);
  58
  59                 if (len >= 2 && !argv[1] && argv[0][len - 2] == '\\' && argv[0][len - 1] == 'c') {
  60                         argv[0][len - 2] = '\0';
  61                         nflag = 1;
  62                 }
  63                 printf("%s", argv[0]);
  64                 if (*++argv)
  65                         putchar(' ');
  66         }
  67         if (!nflag)
  68                 putchar('\n');
  69
  70         exit(0);
  71 }