glibc/support/xfread.c

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/* fread with error checking.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/xstdio.h>
#include <support/check.h>
#include <stdlib.h>
void
xfread (void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t count = 0;
char *p = ptr;
while (count < nmemb)
{
size_t ret = fread (p, size, nmemb - count, stream);
if (ret <= 0 && ferror(stream))
FAIL_EXIT1 ("read of %zu bytes failed after %td: %m",
size * nmemb, p - (char *) ptr);
count += ret;
p += size * ret;
}
}