sys/arch/ia64/stand/common/gets.c

   1 /*      $NetBSD: gets.c,v 1.1 2006/04/07 14:21:29 cherry Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)gets.c      8.1 (Berkeley) 6/11/93
  36  */
  37
  38 #include <sys/cdefs.h>
  39
  40 #include "lib/libsa/stand.h"
  41 #include "lib/libsa/loadfile.h"
  42
  43 #include "bootstrap.h"
  44
  45 /* gets() with constrained input length */
  46
  47 void
  48 ngets(char *buf, int n)
  49 {
  50     int c;
  51     char *lp;
  52
  53     for (lp = buf;;)
  54         switch (c = getchar() & 0177) {
  55         case '\n':
  56         case '\r':
  57             *lp = '\0';
  58             putchar('\n');
  59             return;
  60         case '\b':
  61         case '\177':
  62             if (lp > buf) {
  63                 lp--;
  64                 putchar('\b');
  65                 putchar(' ');
  66                 putchar('\b');
  67             }
  68             break;
  69         case 'r'&037: {
  70             char *p;
  71
  72             putchar('\n');
  73             for (p = buf; p < lp; ++p)
  74                 putchar(*p);
  75             break;
  76         }
  77         case 'u'&037:
  78         case 'w'&037:
  79             lp = buf;
  80             putchar('\n');
  81             break;
  82         default:
  83             if ((n < 1) || ((lp - buf) < n)) {
  84                 *lp++ = c;
  85                 putchar(c);
  86             }
  87         }
  88     /*NOTREACHED*/
  89 }
  90
  91 int
  92 fgetstr(char *buf, int size, int fd)
  93 {
  94     char        c;
  95     int         err, len;
  96
  97     size--;     /* leave space for terminator */
  98     len = 0;
  99     while (size != 0) {
 100         err = read(fd, &c, sizeof(c));
 101         if (err < 0)            /* read error */
 102             return(-1);
 103         if (err == 0) {         /* EOF */
 104             if (len == 0)
 105                 return(-1);     /* nothing to read */
 106             break;
 107         }
 108         if ((c == '\r') ||      /* line terminators */
 109             (c == '\n'))
 110             break;
 111         *buf++ = c;             /* keep char */
 112         size--;
 113         len++;
 114     }
 115     *buf = 0;
 116     return(len);
 117 }