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60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/**************************************************************************
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*
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* f s e e k F u n c t i o n
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* ---------------------------
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* Copyright 1982 by Digital Research Inc. All rights reserved.
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*
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* "fseek" sets the read/write pointer of a stream to an arbitrary
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* offset.
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*
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* Calling sequence:
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* ret = fseek(sp,offset,sense)
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* Where:
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* sp -> (FILE *) stream to seek on
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* offset = signed number of bytes
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* sense = 0 => offset from beginning of file
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* 1 => offset from current position
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* 2 => from end of file
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* ret = 0 for success, -1 for failure
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*
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*****************************************************************************/
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#include "stdio.h"
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WORD fseek(sp,offs,sense) /* CLEAR FUNCTION ***********/
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REG FILE *sp;
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LONG offs;
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WORD sense;
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{
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LONG p, lseek();
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if ( fflush(sp) == FAILURE )
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return( FAILURE );
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p = lseek(fileno(sp),offs,sense);
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sp->_flag &= ~_IOEOF; /* any seek clears EOF flag */
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return( p==(LONG) FAILURE ? FAILURE : SUCCESS);
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}
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/************************************************************************
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*
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* r e w i n d F u n c t i o n
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* -----------------------------
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* Copyright 1982 by Digital Research Inc. All rights reserved.
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*
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* "rewind" sets the read/write pointer of a stream file to the
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* beginning of the stream.
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*
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* Calling sequence:
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* ret = rewind(sp)
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* Where:
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* sp -> a stream file (FILE *)
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* ret = 0 for success, -1 for failure
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*
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*************************************************************************/
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WORD rewind(sp) /* CLEAR FUNCTION ***********/
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FILE *sp;
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{
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return(fseek(sp,0L,0));
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}
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