mirror of
git://git.code.sf.net/p/cdesktopenv/code
synced 2025-02-24 06:54:13 +00:00
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#include "sfhdr.h"
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/* Set some control flags or file descript for the stream
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**
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** Written by Kiem-Phong Vo.
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*/
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#if __STD_C
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int sfset(Sfio_t* f, int flags, int set)
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#else
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int sfset(f,flags,set)
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Sfio_t* f;
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int flags;
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int set;
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#endif
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{
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reg int oflags, tflags, rv;
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SFMTXDECL(f);
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SFMTXENTER(f,0);
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if(flags == 0 && set == 0)
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SFMTXRETURN(f, (f->flags&SF_FLAGS));
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if((oflags = (f->mode&SF_RDWR)) != (int)f->mode)
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{ /* avoid sfsetbuf() isatty() call if user sets (SF_LINE|SF_WCWIDTH) */
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if(set && (flags & (SF_LINE|SF_WCWIDTH)) && !(f->flags & (SF_LINE|SF_WCWIDTH)))
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{ tflags = (SF_LINE|SF_WCWIDTH);
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f->flags |= tflags;
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}
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else tflags = 0;
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rv = _sfmode(f,oflags,0);
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if(tflags)
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f->flags &= ~tflags;
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if(rv < 0)
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SFMTXRETURN(f, 0);
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}
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if(flags == 0)
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SFMTXRETURN(f, (f->flags&SF_FLAGS));
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SFLOCK(f,0);
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/* preserve at least one rd/wr flag */
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oflags = f->flags;
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if(!(f->bits&SF_BOTH) || (flags&SF_RDWR) == SF_RDWR )
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flags &= ~SF_RDWR;
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/* set the flag */
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if(set)
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f->flags |= (flags&SF_SETS);
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else f->flags &= ~(flags&SF_SETS);
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/* must have at least one of read/write */
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if(!(f->flags&SF_RDWR))
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f->flags |= (oflags&SF_RDWR);
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if(f->extent < 0)
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f->flags &= ~SF_APPENDWR;
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/* turn to appropriate mode as necessary */
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if((flags &= SF_RDWR) )
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{ if(!set)
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{ if(flags == SF_READ)
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flags = SF_WRITE;
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else flags = SF_READ;
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}
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if((flags == SF_WRITE && !(f->mode&SF_WRITE)) ||
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(flags == SF_READ && !(f->mode&(SF_READ|SF_SYNCED))) )
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(void)_sfmode(f,flags,1);
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}
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/* if not shared or unseekable, public means nothing */
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if(!(f->flags&SF_SHARE) || f->extent < 0)
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f->flags &= ~SF_PUBLIC;
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SFOPEN(f,0);
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SFMTXRETURN(f, (oflags&SF_FLAGS));
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}
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