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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/stdio/fwrite.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/conv/sizemultiply.h"
#include "libc/errno.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/fputc.h"
#include "libc/stdio/internal.h"
#include "libc/stdio/stdio.h"
/**
* Writes data to stream.
*
* @param stride specifies the size of individual items
* @param count is the number of strides to fetch
* @return count on success, [0,count) on EOF, 0 on error or count==0
*/
size_t fwrite(const void *data, size_t stride, size_t count, FILE *f) {
int rc;
size_t i, bytes;
const unsigned char *p = (const unsigned char *)data;
if (!sizemultiply(&bytes, stride, count)) return fseterr(f, EOVERFLOW);
for (i = 0; i < bytes; ++i) {
if ((rc = __fputc(p[i], f)) == -1) {
if (i % stride != 0) abort(); /* todo(jart) */
return i / stride;
}
}
return count;
}