diff options
Diffstat (limited to 'src/lib/libast/sfio/sfset.c')
| -rw-r--r-- | src/lib/libast/sfio/sfset.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/lib/libast/sfio/sfset.c b/src/lib/libast/sfio/sfset.c new file mode 100644 index 0000000..a18662e --- /dev/null +++ b/src/lib/libast/sfio/sfset.c @@ -0,0 +1,99 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#include "sfhdr.h" + +/* Set some control flags or file descript for the stream +** +** Written by Kiem-Phong Vo. +*/ + +#if __STD_C +int sfset(Sfio_t* f, int flags, int set) +#else +int sfset(f,flags,set) +Sfio_t* f; +int flags; +int set; +#endif +{ + reg int oflags, tflags, rv; + SFMTXDECL(f); + + SFMTXENTER(f,0); + + if(flags == 0 && set == 0) + SFMTXRETURN(f, (f->flags&SF_FLAGS)); + + if((oflags = (f->mode&SF_RDWR)) != (int)f->mode) + { /* avoid sfsetbuf() isatty() call if user sets (SF_LINE|SF_WCWIDTH) */ + if(set && (flags & (SF_LINE|SF_WCWIDTH)) && !(f->flags & (SF_LINE|SF_WCWIDTH))) + { tflags = (SF_LINE|SF_WCWIDTH); + f->flags |= tflags; + } + else tflags = 0; + rv = _sfmode(f,oflags,0); + if(tflags) + f->flags &= ~tflags; + if(rv < 0) + SFMTXRETURN(f, 0); + } + if(flags == 0) + SFMTXRETURN(f, (f->flags&SF_FLAGS)); + + SFLOCK(f,0); + + /* preserve at least one rd/wr flag */ + oflags = f->flags; + if(!(f->bits&SF_BOTH) || (flags&SF_RDWR) == SF_RDWR ) + flags &= ~SF_RDWR; + + /* set the flag */ + if(set) + f->flags |= (flags&SF_SETS); + else f->flags &= ~(flags&SF_SETS); + + /* must have at least one of read/write */ + if(!(f->flags&SF_RDWR)) + f->flags |= (oflags&SF_RDWR); + + if(f->extent < 0) + f->flags &= ~SF_APPENDWR; + + /* turn to appropriate mode as necessary */ + if((flags &= SF_RDWR) ) + { if(!set) + { if(flags == SF_READ) + flags = SF_WRITE; + else flags = SF_READ; + } + if((flags == SF_WRITE && !(f->mode&SF_WRITE)) || + (flags == SF_READ && !(f->mode&(SF_READ|SF_SYNCED))) ) + (void)_sfmode(f,flags,1); + } + + /* if not shared or unseekable, public means nothing */ + if(!(f->flags&SF_SHARE) || f->extent < 0) + f->flags &= ~SF_PUBLIC; + + SFOPEN(f,0); + SFMTXRETURN(f, (oflags&SF_FLAGS)); +} |