Make all bucket and overflow addresses unsigned

[unix-history] / usr / src / lib / libc / stdio / fopen.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fopen.c     5.5 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include "local.h"

FILE *
fopen(file, mode)
       const char *file;
       const char *mode;
{
       register FILE *fp;
       register int f;
       int flags, oflags;

       if ((flags = __sflags(mode, &oflags)) == 0)
               return (NULL);
       if ((fp = __sfp()) == NULL)
               return (NULL);
       if ((f = open(file, oflags, DEFFILEMODE)) < 0) {
               fp->_flags = 0;                 /* release */
               return (NULL);
       }
       fp->_file = f;
       fp->_flags = flags;
       fp->_cookie = fp;
       fp->_read = __sread;
       fp->_write = __swrite;
       fp->_seek = __sseek;
       fp->_close = __sclose;

       /*
        * When opening in append mode, even though we use O_APPEND,
        * we need to seek to the end so that ftell() gets the right
        * answer.  If the user then alters the seek pointer, or
        * the file extends, this will fail, but there is not much
        * we can do about this.  (We could set __SAPP and check in
        * fseek and ftell.)
        */
       if (oflags & O_APPEND)
               (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
       return (fp);
}