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#include <io.h>
#include <unistd.h>
#include <string.h>
#include <atomic.h>
#include <stdio.h>
char __stdin_buffer[BUFSIZ];
size_t fread(void *restrict ptr, size_t size, size_t nitems,
FILE *restrict stream)
{
if (size == 0 || nitems == 0)
return 0;
size_t total = size * nitems;
size_t bytes_read = 0;
char *p = ptr;
LIBC_LOCK(stream->lock);
while (total > 0) {
if (stream->buf_pos < stream->buf_len) {
size_t available = stream->buf_len - stream->buf_pos;
size_t to_copy = total < available ? total : available;
memcpy(p, stream->buf + stream->buf_pos, to_copy);
stream->buf_pos += to_copy;
p += to_copy;
bytes_read += to_copy;
total -= to_copy;
continue;
}
ssize_t ret = read(stream->fd, stream->buf, stream->buf_size);
if (ret <= 0) {
if (ret < 0)
stream->flags |= _IO_ERR;
else
stream->flags |= _IO_EOF;
break;
}
stream->buf_len = ret;
stream->buf_pos = 0;
}
LIBC_UNLOCK(stream->lock);
return bytes_read / size;
}
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