/*      $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.
 * 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.
 */

#include "stand.h"

/* gets() with constrained input length */

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

    for (lp = buf;;) {
        c = getchar();
        if (c == -1)
                break;
        switch (c & 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);
}