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100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* fseeko.c
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* 64-bit versions of fseeko/ftello()
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*
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/port/fseeko.c,v 1.6 2002/10/24 04:48:08 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#if defined(bsdi) || defined(netbsd)
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#include "c.h"
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#ifdef bsdi
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#include <pthread.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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/*
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* On BSD/OS and NetBSD, off_t and fpos_t are the same. Standards
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* say off_t is an arithmetic type, but not necessarily integral,
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* while fpos_t might be neither.
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*
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* This is thread-safe on BSD/OS using flockfile/funlockfile.
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*/
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int
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fseeko(FILE *stream, off_t offset, int whence)
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{
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off_t floc;
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struct stat filestat;
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switch (whence)
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{
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case SEEK_CUR:
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#ifdef bsdi
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flockfile(stream);
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#endif
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if (fgetpos(stream, &floc) != 0)
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goto failure;
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floc += offset;
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if (fsetpos(stream, &floc) != 0)
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goto failure;
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#ifdef bsdi
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flockfile(stream);
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#endif
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return 0;
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break;
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case SEEK_SET:
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if (fsetpos(stream, &offset) != 0)
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return -1;
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return 0;
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break;
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case SEEK_END:
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#ifdef bsdi
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flockfile(stream);
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#endif
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if (fstat(fileno(stream), &filestat) != 0)
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goto failure;
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floc = filestat.st_size;
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if (fsetpos(stream, &floc) != 0)
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goto failure;
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#ifdef bsdi
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funlockfile(stream);
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#endif
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return 0;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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failure:
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#ifdef bsdi
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funlockfile(stream);
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#endif
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return -1;
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}
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off_t
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ftello(FILE *stream)
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{
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off_t floc;
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if (fgetpos(stream, &floc) != 0)
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return -1;
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return floc;
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}
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#endif
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