14887Schin /***********************************************************************
24887Schin * *
34887Schin * This software is part of the ast package *
4*12068SRoger.Faulkner@Oracle.COM * Copyright (c) 1985-2010 AT&T Intellectual Property *
54887Schin * and is licensed under the *
64887Schin * Common Public License, Version 1.0 *
78462SApril.Chin@Sun.COM * by AT&T Intellectual Property *
84887Schin * *
94887Schin * A copy of the License is available at *
104887Schin * http://www.opensource.org/licenses/cpl1.0.txt *
114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
124887Schin * *
134887Schin * Information and Software Systems Research *
144887Schin * AT&T Research *
154887Schin * Florham Park NJ *
164887Schin * *
174887Schin * Glenn Fowler <gsf@research.att.com> *
184887Schin * David Korn <dgk@research.att.com> *
194887Schin * Phong Vo <kpv@research.att.com> *
204887Schin * *
214887Schin ***********************************************************************/
224887Schin #include "sfhdr.h"
234887Schin
244887Schin /* Tell the current location in a given stream
254887Schin **
264887Schin ** Written by Kiem-Phong Vo.
274887Schin */
284887Schin
294887Schin #if __STD_C
sftell(Sfio_t * f)308462SApril.Chin@Sun.COM Sfoff_t sftell(Sfio_t* f)
314887Schin #else
324887Schin Sfoff_t sftell(f)
338462SApril.Chin@Sun.COM Sfio_t *f;
344887Schin #endif
354887Schin {
364887Schin reg int mode;
374887Schin Sfoff_t p;
388462SApril.Chin@Sun.COM SFMTXDECL(f);
394887Schin
408462SApril.Chin@Sun.COM SFMTXENTER(f, (Sfoff_t)(-1));
414887Schin
424887Schin /* set the stream to the right mode */
434887Schin if((mode = f->mode&SF_RDWR) != (int)f->mode && _sfmode(f,mode,0) < 0)
444887Schin SFMTXRETURN(f, (Sfoff_t)(-1));
454887Schin
464887Schin /* throw away ungetc data */
474887Schin if(f->disc == _Sfudisc)
484887Schin (void)sfclose((*_Sfstack)(f,NIL(Sfio_t*)));
494887Schin
504887Schin if(f->flags&SF_STRING)
514887Schin SFMTXRETURN(f, (Sfoff_t)(f->next-f->data));
524887Schin
534887Schin /* let sfseek() handle the hard case */
544887Schin if(f->extent >= 0 && (f->flags&(SF_SHARE|SF_APPENDWR)) )
554887Schin p = sfseek(f,(Sfoff_t)0,SEEK_CUR);
564887Schin else p = f->here + ((f->mode&SF_WRITE) ? f->next-f->data : f->next-f->endb);
574887Schin
584887Schin SFMTXRETURN(f,p);
594887Schin }
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