138451Smsmith/* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk Exp $ */ 238451Smsmith 338451Smsmith/*- 438451Smsmith * Copyright (c) 1993 538451Smsmith * The Regents of the University of California. All rights reserved. 638451Smsmith * 738451Smsmith * Redistribution and use in source and binary forms, with or without 838451Smsmith * modification, are permitted provided that the following conditions 938451Smsmith * are met: 1038451Smsmith * 1. Redistributions of source code must retain the above copyright 1138451Smsmith * notice, this list of conditions and the following disclaimer. 1238451Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1338451Smsmith * notice, this list of conditions and the following disclaimer in the 1438451Smsmith * documentation and/or other materials provided with the distribution. 1538451Smsmith * 4. Neither the name of the University nor the names of its contributors 1638451Smsmith * may be used to endorse or promote products derived from this software 1738451Smsmith * without specific prior written permission. 1838451Smsmith * 1938451Smsmith * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2038451Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2138451Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2238451Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2338451Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2438451Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2538451Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2638451Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2738451Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2838451Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2938451Smsmith * SUCH DAMAGE. 3038451Smsmith * 3138451Smsmith * @(#)gets.c 8.1 (Berkeley) 6/11/93 3238451Smsmith */ 3338451Smsmith 3484221Sdillon#include <sys/cdefs.h> 3584221Sdillon__FBSDID("$FreeBSD$"); 3684221Sdillon 3738451Smsmith#include "stand.h" 3838451Smsmith 3938451Smsmith/* gets() with constrained input length */ 4038451Smsmith 4138451Smsmithvoid 4238451Smsmithngets(char *buf, int n) 4338451Smsmith{ 4492913Sobrien int c; 4592913Sobrien char *lp; 4638451Smsmith 4738451Smsmith for (lp = buf;;) 4838451Smsmith switch (c = getchar() & 0177) { 4938451Smsmith case '\n': 5038451Smsmith case '\r': 5138451Smsmith *lp = '\0'; 5238451Smsmith putchar('\n'); 5338451Smsmith return; 5438451Smsmith case '\b': 5538451Smsmith case '\177': 5638451Smsmith if (lp > buf) { 5738451Smsmith lp--; 5838451Smsmith putchar('\b'); 5938451Smsmith putchar(' '); 6038451Smsmith putchar('\b'); 6138451Smsmith } 6238451Smsmith break; 6338451Smsmith case 'r'&037: { 6492913Sobrien char *p; 6538451Smsmith 6638451Smsmith putchar('\n'); 6738451Smsmith for (p = buf; p < lp; ++p) 6838451Smsmith putchar(*p); 6938451Smsmith break; 7038451Smsmith } 7138451Smsmith case 'u'&037: 7238451Smsmith case 'w'&037: 7338451Smsmith lp = buf; 7438451Smsmith putchar('\n'); 7538451Smsmith break; 7638451Smsmith default: 77190593Sjhb if ((n < 1) || ((lp - buf) < n - 1)) { 7838451Smsmith *lp++ = c; 7938451Smsmith putchar(c); 8038451Smsmith } 8138451Smsmith } 8238451Smsmith /*NOTREACHED*/ 8338451Smsmith} 8438451Smsmith 8538451Smsmithint 8638451Smsmithfgetstr(char *buf, int size, int fd) 8738451Smsmith{ 8838451Smsmith char c; 8938451Smsmith int err, len; 9038451Smsmith 9138451Smsmith size--; /* leave space for terminator */ 9238451Smsmith len = 0; 9338451Smsmith while (size != 0) { 9438451Smsmith err = read(fd, &c, sizeof(c)); 9538451Smsmith if (err < 0) /* read error */ 9638451Smsmith return(-1); 9740774Smsmith if (err == 0) { /* EOF */ 9840774Smsmith if (len == 0) 9940774Smsmith return(-1); /* nothing to read */ 10038451Smsmith break; 10140774Smsmith } 10238451Smsmith if ((c == '\r') || /* line terminators */ 10338451Smsmith (c == '\n')) 10438451Smsmith break; 10538451Smsmith *buf++ = c; /* keep char */ 10638451Smsmith size--; 10738451Smsmith len++; 10838451Smsmith } 10938451Smsmith *buf = 0; 11038451Smsmith return(len); 11138451Smsmith} 11238451Smsmith 113