Annotation of prex-old/usr/lib/libc/stdio/wsetup.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 1990, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * This code is derived from software contributed to Berkeley by
! 6: * Chris Torek.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <stdio.h>
! 34: #include <stdlib.h>
! 35: #include "local.h"
! 36:
! 37:
! 38: /*
! 39: * Various output routines call wsetup to be sure it is safe to write,
! 40: * because either _flags does not include __SWR, or _buf is NULL.
! 41: * _wsetup returns 0 if OK to write, nonzero otherwise.
! 42: */
! 43: int
! 44: __swsetup(fp)
! 45: FILE *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: __smakebuf(fp);
! 73:
! 74: fp->_w = fp->_flags & (__SNBF|__SLBF) ? 0 : fp->_bf._size;
! 75: return (0);
! 76: }
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