/*-
* 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;
