syslinux/com32/lib/sys/read.c
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   1/* ----------------------------------------------------------------------- *
   2 *
   3 *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
   4 *
   5 *   Permission is hereby granted, free of charge, to any person
   6 *   obtaining a copy of this software and associated documentation
   7 *   files (the "Software"), to deal in the Software without
   8 *   restriction, including without limitation the rights to use,
   9 *   copy, modify, merge, publish, distribute, sublicense, and/or
  10 *   sell copies of the Software, and to permit persons to whom
  11 *   the Software is furnished to do so, subject to the following
  12 *   conditions:
  13 *
  14 *   The above copyright notice and this permission notice shall
  15 *   be included in all copies or substantial portions of the Software.
  16 *
  17 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24 *   OTHER DEALINGS IN THE SOFTWARE.
  25 *
  26 * ----------------------------------------------------------------------- */
  27
  28/*
  29 * read.c
  30 *
  31 * Reading from a file descriptor
  32 */
  33
  34#include <errno.h>
  35#include <string.h>
  36#include <com32.h>
  37#include <minmax.h>
  38#include <klibc/compiler.h>
  39#include "file.h"
  40
  41ssize_t read(int fd, void *buf, size_t count)
  42{
  43    struct file_info *fp = &__file_info[fd];
  44
  45    if (fd >= NFILES || !fp->iop) {
  46        errno = EBADF;
  47        return -1;
  48    }
  49
  50    return fp->iop->read(fp, buf, count);
  51}
  52
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