cc65/libsrc/common/freopen.c

/*
 * freopen.c
 *
 * Ullrich von Bassewitz, 17.06.1998
 */



#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include "_file.h"



FILE* freopen (const char* name, const char* mode, FILE* f)
{
    /* Check if the file is open, if so, close it */
    if ((f->f_flags & _FOPEN) == 0) {
	/* File is not open */
	_errno = EINVAL;		/* File not input */
	return 0;
    }

    /* Close the file. Don't bother setting the flag, it will get
     * overwritten by _fopen.
     */
    if (close (f->f_fd) < 0) {
	/* An error occured, _oserror is set */
	return 0;
    }

    /* Open the file and return the descriptor */
    return _fopen (name, mode, f);
}