snprintf/wsetup.c

   1 /*      $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */
   2 /*-
   3  * Copyright (c) 1990, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Chris Torek.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <assert.h>
  37 #include "local.h"
  38
  39 /*
  40  * Various output routines call wsetup to be sure it is safe to write,
  41  * because either _flags does not include __SWR, or _buf is NULL.
  42  * _wsetup returns 0 if OK to write, nonzero otherwise.
  43  */
  44 int
  45 __swsetup(LFILE *fp)
  46 {
  47         /* make sure stdio is set up */
  48 //      if (!__sdidinit)
  49 //              __sinit();
  50
  51         /*
  52          * If we are not writing, we had better be reading and writing.
  53          */
  54         if ((fp->_flags & __SWR) == 0) {
  55                 if ((fp->_flags & __SRW) == 0)
  56                         return (EOF);
  57                 if (fp->_flags & __SRD) {
  58                         /* clobber any ungetc data */
  59                         if (HASUB(fp))
  60                                 FREEUB(fp);
  61                         fp->_flags &= ~(__SRD|__SEOF);
  62                         fp->_r = 0;
  63                         fp->_p = fp->_bf._base;
  64                 }
  65                 fp->_flags |= __SWR;
  66         }
  67
  68         /*
  69          * Make a buffer if necessary, then set _w.
  70          */
  71         if (fp->_bf._base == NULL) {
  72 //              if ((fp->_flags & (__SSTR | __SALC)) == __SSTR)
  73 //                      return (EOF);
  74 //              __smakebuf(fp);
  75                 assert(0);
  76         }
  77         if (fp->_flags & __SLBF) {
  78                 /*
  79                  * It is line buffered, so make _lbfsize be -_bufsize
  80                  * for the putc() macro.  We will change _lbfsize back
  81                  * to 0 whenever we turn off __SWR.
  82                  */
  83                 fp->_w = 0;
  84                 fp->_lbfsize = -fp->_bf._size;
  85         } else
  86                 fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
  87         return (0);
  88 }