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  1. /*  $NetBSD: echo.c,v 1.8 1996/11/02 18:26:06 christos Exp $    */
  2.  
  3. /*-
  4.  * Copyright (c) 1991, 1993
  5.  *  The Regents of the University of California.  All rights reserved.
  6.  *
  7.  * This code is derived from software contributed to Berkeley by
  8.  * Kenneth Almquist.
  9.  *
  10.  * Redistribution and use in source and binary forms, with or without
  11.  * modification, are permitted provided that the following conditions
  12.  * are met:
  13.  * 1. Redistributions of source code must retain the above copyright
  14.  *    notice, this list of conditions and the following disclaimer.
  15.  * 2. Redistributions in binary form must reproduce the above copyright
  16.  *    notice, this list of conditions and the following disclaimer in the
  17.  *    documentation and/or other materials provided with the distribution.
  18.  * 3. All advertising materials mentioning features or use of this software
  19.  *    must display the following acknowledgement:
  20.  *  This product includes software developed by the University of
  21.  *  California, Berkeley and its contributors.
  22.  * 4. Neither the name of the University nor the names of its contributors
  23.  *    may be used to endorse or promote products derived from this software
  24.  *    without specific prior written permission.
  25.  *
  26.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36.  * SUCH DAMAGE.
  37.  *
  38.  *  @(#)echo.c  8.1 (Berkeley) 5/31/93
  39.  */
  40.  
  41. /*
  42.  * Echo command.
  43.  */
  44.  
  45. #define main echocmd
  46.  
  47. #ifdef _GNU_SOURCE
  48. #include <stdio.h>
  49.  
  50. #include "../mystring.h"
  51. #else
  52. #include "bltin.h"
  53. #endif
  54.  
  55. /* #define eflag 1 */
  56.  
  57. int
  58. main(argc, argv)  char **argv; {
  59.     register char **ap;
  60.     register char *p;
  61.     register char c;
  62.     int nflag = 0;
  63. #ifndef eflag
  64.     int eflag = 0;
  65. #endif
  66.  
  67.     ap = argv;
  68.     if (argc)
  69.         ap++;
  70.     while ((p = *ap) != NULL && *p == '-') {
  71.         if (equal(p, "-n")) {
  72.             nflag = 1;
  73.         } else if (equal(p, "-e")) {
  74. #ifndef eflag
  75.             eflag = 1;
  76. #endif
  77.         } else if (equal(p, "-E")) {
  78. #ifndef eflag
  79.             eflag = 0;
  80. #endif
  81.         }
  82.         else break;
  83.         ap++;
  84.     }
  85.     while ((p = *ap++) != NULL) {
  86.         while ((c = *p++) != '\0') {
  87.             if (c == '\\' && eflag) {
  88.                 switch (c = *p++) {
  89.                 case 'a':  c = '\007'; break;
  90.                 case 'b':  c = '\b';  break;
  91.                 case 'c':  return 0;        /* exit */
  92.                 case 'e':  c = '\033';  break;
  93.                 case 'f':  c = '\f';  break;
  94.                 case 'n':  c = '\n';  break;
  95.                 case 'r':  c = '\r';  break;
  96.                 case 't':  c = '\t';  break;
  97.                 case 'v':  c = '\v';  break;
  98.                 case '\\':  break;      /* c = '\\' */
  99.                 case '0': case '1': case '2': case '3':
  100.                 case '4': case '5': case '6': case '7':
  101.                     c -= '0';
  102.                     if (*p >= '0' && *p <= '7')
  103.                         c = c * 8 + (*p++ - '0');
  104.                     if (*p >= '0' && *p <= '7')
  105.                     c = c * 8 + (*p++ - '0');
  106.                     break;
  107.                 default:
  108.                     p--;
  109.                     break;
  110.                 }
  111.             }
  112.             putchar(c);
  113.         }
  114.         if (*ap)
  115.             putchar(' ');
  116.     }
  117.     if (! nflag)
  118.         putchar('\n');
  119. #ifdef _GNU_SOURCE
  120.     fflush(stdout);
  121.     if (ferror(stdout)) {
  122.         clearerr(stdout);
  123.         return 1;
  124.     }
  125. #endif
  126.     return 0;
  127. }
  128.