1da2e3ebdSchin /***********************************************************************
2da2e3ebdSchin * *
3da2e3ebdSchin * This software is part of the ast package *
4*3e14f97fSRoger A. Faulkner * Copyright (c) 1985-2010 AT&T Intellectual Property *
5da2e3ebdSchin * and is licensed under the *
6da2e3ebdSchin * Common Public License, Version 1.0 *
77c2fbfb3SApril Chin * by AT&T Intellectual Property *
8da2e3ebdSchin * *
9da2e3ebdSchin * A copy of the License is available at *
10da2e3ebdSchin * http://www.opensource.org/licenses/cpl1.0.txt *
11da2e3ebdSchin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12da2e3ebdSchin * *
13da2e3ebdSchin * Information and Software Systems Research *
14da2e3ebdSchin * AT&T Research *
15da2e3ebdSchin * Florham Park NJ *
16da2e3ebdSchin * *
17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> *
18da2e3ebdSchin * David Korn <dgk@research.att.com> *
19da2e3ebdSchin * Phong Vo <kpv@research.att.com> *
20da2e3ebdSchin * *
21da2e3ebdSchin ***********************************************************************/
22da2e3ebdSchin #include "sfhdr.h"
23da2e3ebdSchin
24da2e3ebdSchin /* Tell the current location in a given stream
25da2e3ebdSchin **
26da2e3ebdSchin ** Written by Kiem-Phong Vo.
27da2e3ebdSchin */
28da2e3ebdSchin
29da2e3ebdSchin #if __STD_C
sftell(Sfio_t * f)307c2fbfb3SApril Chin Sfoff_t sftell(Sfio_t* f)
31da2e3ebdSchin #else
32da2e3ebdSchin Sfoff_t sftell(f)
337c2fbfb3SApril Chin Sfio_t *f;
34da2e3ebdSchin #endif
35da2e3ebdSchin {
36da2e3ebdSchin reg int mode;
37da2e3ebdSchin Sfoff_t p;
387c2fbfb3SApril Chin SFMTXDECL(f);
39da2e3ebdSchin
407c2fbfb3SApril Chin SFMTXENTER(f, (Sfoff_t)(-1));
41da2e3ebdSchin
42da2e3ebdSchin /* set the stream to the right mode */
43da2e3ebdSchin if((mode = f->mode&SF_RDWR) != (int)f->mode && _sfmode(f,mode,0) < 0)
44da2e3ebdSchin SFMTXRETURN(f, (Sfoff_t)(-1));
45da2e3ebdSchin
46da2e3ebdSchin /* throw away ungetc data */
47da2e3ebdSchin if(f->disc == _Sfudisc)
48da2e3ebdSchin (void)sfclose((*_Sfstack)(f,NIL(Sfio_t*)));
49da2e3ebdSchin
50da2e3ebdSchin if(f->flags&SF_STRING)
51da2e3ebdSchin SFMTXRETURN(f, (Sfoff_t)(f->next-f->data));
52da2e3ebdSchin
53da2e3ebdSchin /* let sfseek() handle the hard case */
54da2e3ebdSchin if(f->extent >= 0 && (f->flags&(SF_SHARE|SF_APPENDWR)) )
55da2e3ebdSchin p = sfseek(f,(Sfoff_t)0,SEEK_CUR);
56da2e3ebdSchin else p = f->here + ((f->mode&SF_WRITE) ? f->next-f->data : f->next-f->endb);
57da2e3ebdSchin
58da2e3ebdSchin SFMTXRETURN(f,p);
59da2e3ebdSchin }
60