lib/libstand/gets.c

	gets.c revision 199767f8919635c4928607450d9e0abb932109ce
/*  $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk 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.
 * 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "stand.h"

/* gets() with constrained input length */

void
ngets(char *buf, int n)
{
    int c;
    char *lp;

    for (lp = buf;;)
    switch (c = getchar() & 0177) {
    case '\n':
    case '\r':
        *lp = '\0';
        putchar('\n');
        return;
    case '\b':
    case '\177':
        if (lp > buf) {
        lp--;
        putchar('\b');
        putchar(' ');
        putchar('\b');
        }
        break;
    case 'r'&037: {
        char *p;

        putchar('\n');
        for (p = buf; p < lp; ++p)
        putchar(*p);
        break;
    }
    case 'u'&037:
    case 'w'&037:
        lp = buf;
        putchar('\n');
        break;
    default:
        if ((n < 1) || ((lp - buf) < n - 1)) {
        *lp++ = c;
        putchar(c);
        }
    }
    /*NOTREACHED*/
}

int
fgetstr(char *buf, int size, int fd)
{
    char    c;
    int     err, len;

    size--; /* leave space for terminator */
    len = 0;
    while (size != 0) {
    err = read(fd, &c, sizeof(c));
    if (err < 0)        /* read error */
        return(-1);
    if (err == 0) {     /* EOF */
        if (len == 0)
        return(-1); /* nothing to read */
        break;
    }
    if ((c == '\r') ||  /* line terminators */
        (c == '\n'))
        break;
    *buf++ = c;     /* keep char */
    size--;
    len++;
    }
    *buf = 0;
    return(len);
}