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gets.c revision 1.1.6.2 
      1  1.1.6.2  simonb /*	$NetBSD: gets.c,v 1.1.6.2 2006/04/22 11:37:38 simonb Exp $	*/
      2  1.1.6.2  simonb 
      3  1.1.6.2  simonb /*-
      4  1.1.6.2  simonb  * Copyright (c) 1993
      5  1.1.6.2  simonb  *	The Regents of the University of California.  All rights reserved.
      6  1.1.6.2  simonb  *
      7  1.1.6.2  simonb  * Redistribution and use in source and binary forms, with or without
      8  1.1.6.2  simonb  * modification, are permitted provided that the following conditions
      9  1.1.6.2  simonb  * are met:
     10  1.1.6.2  simonb  * 1. Redistributions of source code must retain the above copyright
     11  1.1.6.2  simonb  *    notice, this list of conditions and the following disclaimer.
     12  1.1.6.2  simonb  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1.6.2  simonb  *    notice, this list of conditions and the following disclaimer in the
     14  1.1.6.2  simonb  *    documentation and/or other materials provided with the distribution.
     15  1.1.6.2  simonb  * 3. All advertising materials mentioning features or use of this software
     16  1.1.6.2  simonb  *    must display the following acknowledgement:
     17  1.1.6.2  simonb  *	This product includes software developed by the University of
     18  1.1.6.2  simonb  *	California, Berkeley and its contributors.
     19  1.1.6.2  simonb  * 4. Neither the name of the University nor the names of its contributors
     20  1.1.6.2  simonb  *    may be used to endorse or promote products derived from this software
     21  1.1.6.2  simonb  *    without specific prior written permission.
     22  1.1.6.2  simonb  *
     23  1.1.6.2  simonb  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1.6.2  simonb  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1.6.2  simonb  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1.6.2  simonb  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1.6.2  simonb  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1.6.2  simonb  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1.6.2  simonb  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1.6.2  simonb  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1.6.2  simonb  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1.6.2  simonb  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1.6.2  simonb  * SUCH DAMAGE.
     34  1.1.6.2  simonb  *
     35  1.1.6.2  simonb  *	@(#)gets.c	8.1 (Berkeley) 6/11/93
     36  1.1.6.2  simonb  */
     37  1.1.6.2  simonb 
     38  1.1.6.2  simonb #include <sys/cdefs.h>
     39  1.1.6.2  simonb 
     40  1.1.6.2  simonb #include "bootstrap.h"
     41  1.1.6.2  simonb 
     42  1.1.6.2  simonb /* gets() with constrained input length */
     43  1.1.6.2  simonb 
     44  1.1.6.2  simonb void
     45  1.1.6.2  simonb ngets(char *buf, int n)
     46  1.1.6.2  simonb {
     47  1.1.6.2  simonb     int c;
     48  1.1.6.2  simonb     char *lp;
     49  1.1.6.2  simonb 
     50  1.1.6.2  simonb     for (lp = buf;;)
     51  1.1.6.2  simonb 	switch (c = getchar() & 0177) {
     52  1.1.6.2  simonb 	case '\n':
     53  1.1.6.2  simonb 	case '\r':
     54  1.1.6.2  simonb 	    *lp = '\0';
     55  1.1.6.2  simonb 	    putchar('\n');
     56  1.1.6.2  simonb 	    return;
     57  1.1.6.2  simonb 	case '\b':
     58  1.1.6.2  simonb 	case '\177':
     59  1.1.6.2  simonb 	    if (lp > buf) {
     60  1.1.6.2  simonb 		lp--;
     61  1.1.6.2  simonb 		putchar('\b');
     62  1.1.6.2  simonb 		putchar(' ');
     63  1.1.6.2  simonb 		putchar('\b');
     64  1.1.6.2  simonb 	    }
     65  1.1.6.2  simonb 	    break;
     66  1.1.6.2  simonb 	case 'r'&037: {
     67  1.1.6.2  simonb 	    char *p;
     68  1.1.6.2  simonb 
     69  1.1.6.2  simonb 	    putchar('\n');
     70  1.1.6.2  simonb 	    for (p = buf; p < lp; ++p)
     71  1.1.6.2  simonb 		putchar(*p);
     72  1.1.6.2  simonb 	    break;
     73  1.1.6.2  simonb 	}
     74  1.1.6.2  simonb 	case 'u'&037:
     75  1.1.6.2  simonb 	case 'w'&037:
     76  1.1.6.2  simonb 	    lp = buf;
     77  1.1.6.2  simonb 	    putchar('\n');
     78  1.1.6.2  simonb 	    break;
     79  1.1.6.2  simonb 	default:
     80  1.1.6.2  simonb 	    if ((n < 1) || ((lp - buf) < n)) {
     81  1.1.6.2  simonb 		*lp++ = c;
     82  1.1.6.2  simonb 		putchar(c);
     83  1.1.6.2  simonb 	    }
     84  1.1.6.2  simonb 	}
     85  1.1.6.2  simonb     /*NOTREACHED*/
     86  1.1.6.2  simonb }
     87  1.1.6.2  simonb 
     88  1.1.6.2  simonb int
     89  1.1.6.2  simonb fgetstr(char *buf, int size, int fd)
     90  1.1.6.2  simonb {
     91  1.1.6.2  simonb     char	c;
     92  1.1.6.2  simonb     int		err, len;
     93  1.1.6.2  simonb 
     94  1.1.6.2  simonb     size--;	/* leave space for terminator */
     95  1.1.6.2  simonb     len = 0;
     96  1.1.6.2  simonb     while (size != 0) {
     97  1.1.6.2  simonb 	err = read(fd, &c, sizeof(c));
     98  1.1.6.2  simonb 	if (err < 0)		/* read error */
     99  1.1.6.2  simonb 	    return(-1);
    100  1.1.6.2  simonb 	if (err == 0) {		/* EOF */
    101  1.1.6.2  simonb 	    if (len == 0)
    102  1.1.6.2  simonb 		return(-1);	/* nothing to read */
    103  1.1.6.2  simonb 	    break;
    104  1.1.6.2  simonb 	}
    105  1.1.6.2  simonb 	if ((c == '\r') ||	/* line terminators */
    106  1.1.6.2  simonb 	    (c == '\n'))
    107  1.1.6.2  simonb 	    break;
    108  1.1.6.2  simonb 	*buf++ = c;		/* keep char */
    109  1.1.6.2  simonb 	size--;
    110  1.1.6.2  simonb 	len++;
    111  1.1.6.2  simonb     }
    112  1.1.6.2  simonb     *buf = 0;
    113  1.1.6.2  simonb     return(len);
    114  1.1.6.2  simonb }
    115