commands/ash/bltin/echo.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)echo.c      8.2 (Berkeley) 5/4/95
  33  */
  34
  35 /*
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/bin/sh/bltin/echo.c,v 1.14 2004/04/06 20:06:53 markm Exp $");
  38 */
  39
  40 /*
  41  * Echo command.
  42  */
  43
  44 #ifdef __minix
  45 #define MINIX
  46 #endif
  47
  48 #include "bltin.h"
  49
  50 #ifndef MINIX
  51 /* #define eflag 1 */
  52 #else
  53 #undef eflag
  54 #endif
  55
  56 int
  57 echocmd(argc, argv)
  58         int argc;
  59         char **argv;
  60 {
  61         char **ap;
  62         char *p;
  63         char c;
  64         int count;
  65         int nflag = 0;
  66 #ifndef eflag
  67         int eflag = 0;
  68 #endif
  69
  70         ap = argv;
  71         if (argc)
  72                 ap++;
  73         if ((p = *ap) != NULL) {
  74 #ifdef MINIX
  75                 if (equal(p, "--")) {
  76                         ap++;
  77                 }
  78 #endif
  79                 if (equal(p, "-n")) {
  80                         nflag++;
  81                         ap++;
  82                 } else if (equal(p, "-e")) {
  83 #ifndef eflag
  84                         eflag++;
  85 #endif
  86                         ap++;
  87                 }
  88         }
  89         while ((p = *ap++) != NULL) {
  90                 while ((c = *p++) != '\0') {
  91                         if (c == '\\' && eflag) {
  92                                 switch (*p++) {
  93                                 case 'a':  c = '\a';  break;
  94                                 case 'b':  c = '\b';  break;
  95                                 case 'c':  return 0;            /* exit */
  96                                 case 'e':  c = '\033';  break;
  97                                 case 'f':  c = '\f';  break;
  98                                 case 'n':  c = '\n';  break;
  99                                 case 'r':  c = '\r';  break;
 100                                 case 't':  c = '\t';  break;
 101                                 case 'v':  c = '\v';  break;
 102                                 case '\\':  break;              /* c = '\\' */
 103                                 case '0':
 104                                         c = 0;
 105                                         count = 3;
 106                                         while (--count >= 0 && (unsigned)(*p - '0') < 8)
 107                                                 c = (c << 3) + (*p++ - '0');
 108                                         break;
 109                                 default:
 110                                         p--;
 111                                         break;
 112                                 }
 113                         }
 114                         putchar(c);
 115                 }
 116                 if (*ap)
 117                         putchar(' ');
 118         }
 119         if (! nflag)
 120                 putchar('\n');
 121         return 0;
 122 }
 123
 124 /*
 125  * $PchId: echo.c,v 1.5 2006/05/23 12:05:56 philip Exp $
 126  */