/* $NetBSD: gets.c,v 1.1.1.2 1995/06/01 20:37:58 gwr 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 gets(buf) char *buf; { register int c; register char *lp; top: lp = buf; for (;;) { 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: { register 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*/ }