d8e33fe91d
It was possible in some rare circumstances for ngets to behave terribly with bhyveload and some form of redirecting user input over a pipe. PR: 198706 Submitted by: Ivan Krivonos <int0dster@gmail.com> MFC after: 1 week
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)gets.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "stand.h"
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/* gets() with constrained input length */
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void
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ngets(char *buf, int n)
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{
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int c;
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char *lp;
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for (lp = buf;;) {
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c = getchar();
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if (c == -1)
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break;
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switch (c & 0177) {
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case '\n':
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case '\r':
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*lp = '\0';
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putchar('\n');
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return;
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case '\b':
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case '\177':
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if (lp > buf) {
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lp--;
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putchar('\b');
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putchar(' ');
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putchar('\b');
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}
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break;
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case 'r'&037: {
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char *p;
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putchar('\n');
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for (p = buf; p < lp; ++p)
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putchar(*p);
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break;
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}
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case 'u'&037:
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case 'w'&037:
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lp = buf;
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putchar('\n');
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break;
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default:
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if ((n < 1) || ((lp - buf) < n - 1)) {
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*lp++ = c;
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putchar(c);
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}
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}
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}
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/*NOTREACHED*/
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}
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int
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fgetstr(char *buf, int size, int fd)
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{
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char c;
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int err, len;
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size--; /* leave space for terminator */
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len = 0;
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while (size != 0) {
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err = read(fd, &c, sizeof(c));
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if (err < 0) /* read error */
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return(-1);
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if (err == 0) { /* EOF */
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if (len == 0)
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return(-1); /* nothing to read */
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break;
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}
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if ((c == '\r') || /* line terminators */
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(c == '\n'))
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break;
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*buf++ = c; /* keep char */
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size--;
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len++;
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}
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*buf = 0;
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return(len);
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}
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