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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
size_t
fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
{
const char *pos;
size_t n_remaining;
if (ptr == NULL || stream == NULL)
return 0;
if (size == 0 || nmemb == 0)
return 0;
if (!(stream->flags & FILE_WRITE))
return 0;
/* Write data to buffer, flushing as needed */
pos = ptr;
n_remaining = size * nmemb;
while (n_remaining > 0) {
size_t n_free = stream->write_end - stream->write_pos;
/* If enough buffer space is available, finish writing */
if (n_remaining < n_free) {
memcpy(stream->write_pos, pos, n_remaining);
stream->write_pos += n_remaining;
break;
}
/* Otherwise, write as much as possible now */
memcpy(stream->write_pos, pos, n_free);
stream->write_pos += n_free;
/* Return if flushing fails */
if (fflush(stream) == EOF)
return nmemb - (n_remaining / size);
pos += n_free;
n_remaining -= n_free;
}
return nmemb;
}
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