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JM_CIO.C
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JM_CIO.C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <alloc.h>
#include <fcntl.h>
#include <dos.h>
#include <io.h>
#include "jm_cio.h"
//----------------------------------------------------------------------------
//
// PTR/PTR COMPRESSION ROUTINES
//
//
//----------------------------------------------------------------------------
//---------------------------------------------------------------------------
// CIO_WritePtr() -- Outputs data to a particular ptr type
//
// PtrType MUST be of type DEST_TYPE.
//
// NOTE : For PtrTypes DEST_MEM a ZERO (0) is always returned.
//
//---------------------------------------------------------------------------
char CIO_WritePtr(long outfile, unsigned char data, unsigned PtrType)
{
int returnval = 0;
switch (PtrType & DEST_TYPES)
{
case DEST_FILE:
write(*(int far *)outfile,(char *)&data,1);
break;
case DEST_FFILE:
returnval = putc(data, *(FILE **)outfile);
break;
case DEST_IMEM:
printf("CIO_WritePtr - unsupported ptr type\n");
exit(0);
break;
case DEST_MEM:
*((char far *)*(char far **)outfile)++ = data;
break;
}
return(returnval);
}
//---------------------------------------------------------------------------
// CIO_ReadPtr() -- Reads data from a particular ptr type
//
// PtrType MUST be of type SRC_TYPE.
//
// RETURNS :
// The char read in or EOF for SRC_FFILE type of reads.
//
//
//---------------------------------------------------------------------------
int CIO_ReadPtr(long infile, unsigned PtrType)
{
int returnval = 0;
switch (PtrType & SRC_TYPES)
{
case SRC_FILE:
read(*(int far *)infile,(char *)&returnval,1);
break;
case SRC_FFILE:
returnval = getc(*(FILE **)infile);
break;
#if 0
case SRC_BFILE:
returnval = bio_readch((BufferedIO *)*(void far **)infile);
break;
#endif
// case SRC_IMEM:
// printf("CIO_WritePtr - unsupported ptr type\n");
// exit(0);
// break;
case SRC_MEM:
returnval = (unsigned char)*((char far *)*(char far **)infile)++;
break;
}
return(returnval);
}