snprintf/wsetup.c

   1 /*      $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */
   2 /*
   3  * SPDX-License-Identifier: BSD-3-Clause
   4  *
   5  * Copyright (C) 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Chris Torek.
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <assert.h>
  15 #include "local.h"
  16
  17 /*
  18  * Various output routines call wsetup to be sure it is safe to write,
  19  * because either _flags does not include __SWR, or _buf is NULL.
  20  * _wsetup returns 0 if OK to write, nonzero otherwise.
  21  */
  22 int
  23 __swsetup(LTTNG_UST_LFILE *fp)
  24 {
  25         /* make sure stdio is set up */
  26 //      if (!__sdidinit)
  27 //              __sinit();
  28
  29         /*
  30          * If we are not writing, we had better be reading and writing.
  31          */
  32         if ((fp->_flags & __SWR) == 0) {
  33                 if ((fp->_flags & __SRW) == 0)
  34                         return (EOF);
  35                 if (fp->_flags & __SRD) {
  36                         /* clobber any ungetc data */
  37                         if (HASUB(fp))
  38                                 FREEUB(fp);
  39                         fp->_flags &= ~(__SRD|__SEOF);
  40                         fp->_r = 0;
  41                         fp->_p = fp->_bf._base;
  42                 }
  43                 fp->_flags |= __SWR;
  44         }
  45
  46         /*
  47          * Make a buffer if necessary, then set _w.
  48          */
  49         if (fp->_bf._base == NULL) {
  50 //              if ((fp->_flags & (__SSTR | __SALC)) == __SSTR)
  51 //                      return (EOF);
  52 //              __smakebuf(fp);
  53                 assert(0);
  54         }
  55         if (fp->_flags & __SLBF) {
  56                 /*
  57                  * It is line buffered, so make _lbfsize be -_bufsize
  58                  * for the putc() macro.  We will change _lbfsize back
  59                  * to 0 whenever we turn off __SWR.
  60                  */
  61                 fp->_w = 0;
  62                 fp->_lbfsize = -fp->_bf._size;
  63         } else
  64                 fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
  65         return (0);
  66 }