sys/arch/sun68k/stand/libsa/gets.c

   1 /*      $NetBSD: gets.c,v 1.1.24.4 2005/01/24 08:35:03 skrll Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)gets.c      8.1 (Berkeley) 6/11/93
  32  */
  33
  34 #include "stand.h"
  35
  36 /*
  37  * This implementation assumes that getchar() does echo, because
  38  * on some machines, it is hard to keep echo from being done.
  39  * Those that need it can do echo in their getchar() function.
  40  *
  41  * Yes, the code below will echo CR, DEL, and other control chars,
  42  * but sending CR or DEL here is harmless.  All the other editing
  43  * characters will be followed by a newline, so it doesn't matter.
  44  * (Most terminals will not show them anyway.)
  45  */
  46
  47 void
  48 gets(char *buf)
  49 {
  50         int c;
  51         char *lp;
  52
  53 top:
  54         lp = buf;
  55
  56         for (;;) {
  57                 c = getchar() & 0177;
  58
  59 #ifdef  GETS_MUST_ECHO  /* Preserved in case someone wants it... */
  60                 putchar(c);
  61 #endif
  62
  63                 switch (c) {
  64
  65                 default:
  66                         *lp++ = c;
  67                         continue;
  68
  69                 case '\177':
  70                         putchar('\b');
  71                         /* fall through */
  72                 case '\b':
  73                         putchar(' ');
  74                         putchar('\b');
  75                         /* fall through */
  76                 case '#':
  77                         if (lp > buf)
  78                                 lp--;
  79                         continue;
  80
  81 #ifdef  GETS_REPRINT
  82                 /*
  83                  * This is not very useful in a boot program.
  84                  * (It costs you 52 bytes on m68k, gcc -O3).
  85                  */
  86                 case 'r'&037: {
  87                         char *p;
  88
  89                         putchar('\n');
  90                         for (p = buf; p < lp; ++p)
  91                                 putchar(*p);
  92                         continue;
  93                 }
  94 #endif
  95
  96                 case '@':
  97                 case 'u'&037:
  98                 case 'w'&037:
  99                         putchar('\n');
 100                         goto top;
 101
 102                 case '\r':
 103                         putchar('\n');
 104                         /* fall through */
 105                 case '\n':
 106                         *lp = '\0';
 107                         return;
 108
 109                 } /* switch */
 110         }
 111         /*NOTREACHED*/
 112 }