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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [wsetup.c] - Rev 273
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/* No user fns here. Pesch 15apr92. */ /* * Copyright (c) 1990, 2007 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include <_ansi.h> #include <stdio.h> #include <stdlib.h> #include "local.h" /* * Various output routines call wsetup to be sure it is safe to write, * because either _flags does not include __SWR, or _buf is NULL. * _wsetup returns 0 if OK to write, nonzero otherwise. */ int _DEFUN(__swsetup_r, (ptr, fp), struct _reent *ptr _AND register FILE * fp) { /* Make sure stdio is set up. */ CHECK_INIT (_REENT, fp); /* * If we are not writing, we had better be reading and writing. */ if ((fp->_flags & __SWR) == 0) { if ((fp->_flags & __SRW) == 0) return EOF; if (fp->_flags & __SRD) { /* clobber any ungetc data */ if (HASUB (fp)) FREEUB (ptr, fp); fp->_flags &= ~(__SRD | __SEOF); fp->_r = 0; fp->_p = fp->_bf._base; } fp->_flags |= __SWR; } /* * Make a buffer if necessary, then set _w. * A string I/O file should not explicitly allocate a buffer * unless asprintf is being used. */ if (fp->_bf._base == NULL && (!(fp->_flags & __SSTR) || (fp->_flags & __SMBF))) __smakebuf_r (ptr, fp); if (fp->_flags & __SLBF) { /* * It is line buffered, so make _lbfsize be -_bufsize * for the putc() macro. We will change _lbfsize back * to 0 whenever we turn off __SWR. */ fp->_w = 0; fp->_lbfsize = -fp->_bf._size; } else fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; return (!fp->_bf._base && (fp->_flags & __SMBF)) ? EOF : 0; }
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