libgloss/mep/read.c

   1 /* read.c -- read characters from file, with hook.
   2  *
   3  * Copyright (c) 2003  Red Hat, Inc. All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use, modify,
   6  * copy, or redistribute it subject to the terms and conditions of the BSD
   7  * License.  This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY expressed or implied, including the implied
   9  * warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  A copy
  10  * of this license is available at http://www.opensource.org/licenses. Any
  11  * Red Hat trademarks that are incorporated in the source code or documentation
  12  * are not subject to the BSD License and may only be used or replicated with
  13  * the express permission of Red Hat, Inc.
  14  */
  15
  16 extern int __mep_read(int, unsigned char *, int);
  17 extern int _ioIn(void) __attribute__((weak));
  18
  19 int
  20 read(int fd, unsigned char *buf, int count)
  21 {
  22   if (fd == 0 && &_ioIn)
  23     {
  24       int c = 0;
  25       while (c < count)
  26         {
  27           int ch = _ioIn();
  28           *buf++ = ch;
  29           if (ch == -1)
  30             break;
  31           c ++;
  32         }
  33       return c;
  34     }
  35   return __mep_read(fd, buf, count);
  36 }