support/xfread.c

   1 /* fread with error checking.
   2    Copyright (C) 2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/xstdio.h>
  20
  21 #include <support/check.h>
  22 #include <stdlib.h>
  23
  24 void
  25 xfread (void *ptr, size_t size, size_t nmemb, FILE *stream)
  26 {
  27   size_t count = 0;
  28   char *p = ptr;
  29
  30   while (count < nmemb)
  31     {
  32       size_t ret = fread (p, size, nmemb - count, stream);
  33       if (ret <= 0 && ferror(stream))
  34         FAIL_EXIT1 ("read of %zu bytes failed after %td: %m",
  35                     size * nmemb, p - (char *) ptr);
  36       count += ret;
  37       p += size * ret;
  38     }
  39 }