/*      $NetBSD: gets.c,v 1.5 2016/06/11 06:49:46 dholland Exp $        */

/*-
* Copyright (c) 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)gets.c      8.1 (Berkeley) 6/11/93
*/

#include "stand.h"

/*
* This implementation assumes that getchar() does echo, because
* on some machines, it is hard to keep echo from being done.
* Those that need it can do echo in their getchar() function.
*
* Yes, the code below will echo CR, DEL, and other control chars,
* but sending CR or DEL here is harmless.  All the other editing
* characters will be followed by a newline, so it doesn't matter.
* (Most terminals will not show them anyway.)
*/

void
kgets(char *buf, size_t size)
{
       int c;
       char *lp;

top:
       lp = buf;

       for (;;) {
               if (lp - buf == size) {
                       lp--;
                       *lp = '\0';
                       return;
               }
               c = getchar() & 0177;

#ifdef  GETS_MUST_ECHO  /* Preserved in case someone wants it... */
               putchar(c);
#endif

               switch (c) {

               default:
                       *lp++ = c;
                       continue;

               case '\177':
                       putchar('\b');
                       /* fall through */
               case '\b':
                       putchar(' ');
                       putchar('\b');
                       /* fall through */
               case '#':
                       if (lp > buf)
                               lp--;
                       continue;

#ifdef  GETS_REPRINT
               /*
                * This is not very useful in a boot program.
                * (It costs you 52 bytes on m68k, gcc -O3).
                */
               case 'r'&037: {
                       char *p;

                       putchar('\n');
                       for (p = buf; p < lp; ++p)
                               putchar(*p);
                       continue;
               }
#endif

               case '@':
               case 'u'&037:
               case 'w'&037:
                       putchar('\n');
                       goto top;

               case '\r':
                       putchar('\n');
                       /* fall through */
               case '\n':
                       *lp = '\0';
                       return;

               } /* switch */
       }
       /*NOTREACHED*/
}