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  }