msvc/open.c

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/*!
 * \file msvc/open.c
 *
 * \brief A wrapper function for MSVC _open() that converts permission mode.
 *
 * (C) 2025 by the GRASS Development Team
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * \author Huidae Cho
 *
 * \date 2025
 */
 
#include <stdarg.h>
#include <fcntl.h>
#include <sys/stat.h>
 
#define O_TMPFILE O_TEMPORARY
 
int __open(const char *pathname, int flags, ...)
{
    if (flags & (O_CREAT | O_TMPFILE)) {
        va_list ap;
        int mode;
 
        va_start(ap, flags);
        mode = va_arg(ap, int);
        va_end(ap);
 
        return _open(pathname, flags,
                     (mode & 0400 ? _S_IREAD : 0) |
                         (mode & 0200 ? _S_IWRITE : 0));
    }
 
    return _open(pathname, flags);
}