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https://github.com/SEPPDROID/Digital-Research-Source-Code.git
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73 lines
3.0 KiB
Groff
73 lines
3.0 KiB
Groff
/**********************************************************************
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*
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* _ f i l e s z 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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* This routine computes the size of a CP/M file, and leaves the fd
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* pointing to the end of file.
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* Note that the file must have been previously opened.
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*
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* Calling sequence:
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* size = _filesz(fd)
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* where:
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* size = # bytes in file;
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* 0 if not disk file;
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* -1 if I/O error
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* fd = file descriptor returned by open.
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*
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***********************************************************************/
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#include <portab.h>
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#include <cpm.h>
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#include <errno.h>
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LONG _filesz(fd) /****************************/
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WORD fd; /* file descriptor */
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{
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REG FD *fp; /* file's ccb pointer */
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REG BYTE *p1, *p2; /* temps for buffer work */
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REG LONG xsector; /* where we are in file */
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FD *_chkc(); /* cvt & check fd to fp */
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LONG __BDOS(); /* BDOS fn */
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/****************************/
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if((fp = _chkc(fd)) == NULL) /* Convert to pointer */
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return(FAILURE); /* Can't */
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if(fp->flags&(ISTTY|ISLPT)) /* Non disk file? */
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return(0); /* */
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__BDOS(FILSIZ,&(fp->fcb)) /* Do BDOS call */
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fp->fcb.record &= 0xFFFFFFL; /* mask off cr byte */
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if( fp->flags & ISASCII ) /****************************/
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{ /* Ascii file: posit to EOF */
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if(fp->fcb.record > 0) /* if any size at all */
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{ /* *********************/
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xsector = fp->fcb.record - 1; /* last sector in file */
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if( xsector != fp->sector ) /* need to change sector? */
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{ /* get correct sector********/
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if((fp->flags & DIRTY) != 0) /* Something to write 1st? */
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{ /* */
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if(_blkio(fp,fp->sector,fp->buffer, /* Write out */
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1L,B_WRITE) != 1) /* the buffer */
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RETERR(FAILURE,EIO); /* */
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fp->flags &= ~DIRTY; /* turn off this bit */
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} /* */
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if(_blkio(fp,xsector,fp->buffer, /* scan this last sector */
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1L,B_READ) != 1) /* for EOFCHAR */
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RETERR(FAILURE,EIO); /* */
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} /* got correct sector********/
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fp->sector = xsector; /* */
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fp->offset = fp->sector << 7; /* */
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p1 = &(fp->buffer[0]); /* start of buf */
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p2 = &(fp->buffer[SECSIZ]); /* end of buf */
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while( p1<p2 && *p1 != EOFCHAR) /* look for EOFCHAR */
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p1++; /* */
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fp->offset += p1-&(fp->buffer[0]); /* update offset to EOF */
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} /* *********************/
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else fp->offset=0; /* o.w. beginning of file */
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} /****************************/
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else /* Binary file:compute size */
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fp->offset = fp->fcb.record << 7; /* set to end oflast record */
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/****************************/
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fp->hiwater = fp->offset; /* whatever happened, set it*/
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fp->flags |= ATEOF; /* make sure they know */
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return(fp->offset); /* this is it */
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} /****************************/
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