136 lines
2.2 KiB
C
136 lines
2.2 KiB
C
#include "bc_string.h"
|
|
#include <stdio.h>
|
|
#include "bc_io.h"
|
|
|
|
/* $Id$ */
|
|
|
|
Filedesc _fdtable[16];
|
|
/* BASIC file descriptor table */
|
|
/* Channel assignment:
|
|
-1 terminal IO
|
|
0 data file
|
|
1-15 user files
|
|
*/
|
|
|
|
|
|
|
|
int _chann = -1;
|
|
FILE *_chanrd = stdin;
|
|
FILE *_chanwr = stdout;
|
|
|
|
_setchan(index)
|
|
int index;
|
|
{
|
|
#ifdef DEBUG
|
|
printf("setchannel %d\n",index);
|
|
#endif
|
|
fflush(_chanwr);
|
|
if( index == -1)
|
|
{
|
|
_chann= -1;
|
|
_chanrd= stdin;
|
|
_chanwr= stdout;
|
|
return;
|
|
}
|
|
if( index<0 || index>15)
|
|
error(27);
|
|
_chann=index;
|
|
_chanrd= _chanwr= _fdtable[index].fd;
|
|
}
|
|
|
|
_asschn()
|
|
{
|
|
#ifdef DEBUG
|
|
printf("_asschn %d\n",_chann);
|
|
#endif
|
|
if( _chann == -1) return;
|
|
#ifdef DEBUG
|
|
printf(" file %d\n", _fdtable[_chann].fd);
|
|
#endif
|
|
if( _chann<0 || _chann>15)
|
|
error(27);
|
|
if( _fdtable[_chann].fd== 0)
|
|
error(39);
|
|
if( feof( _fdtable[_chann].fd))
|
|
error(2);
|
|
}
|
|
|
|
_clochn(nr)
|
|
int nr;
|
|
{
|
|
if( nr<1 || nr >15 || _fdtable[nr].fd==0) error(3);
|
|
fclose(_fdtable[nr].fd);
|
|
_fdtable[nr].fd=0; _fdtable[nr].fname=0;
|
|
}
|
|
|
|
_opnchn(reclen,fname,mode)
|
|
String *mode,*fname;
|
|
int reclen;
|
|
{
|
|
/* channel has been set */
|
|
FILE *f;
|
|
int m;
|
|
|
|
#ifdef DEBUG
|
|
printf("open %d %s %s \n",reclen,mode->strval,fname->strval);
|
|
#endif
|
|
/* check for opened/closed file */
|
|
if(_fdtable[_chann].fd)
|
|
error(30);
|
|
switch(*mode->strval)
|
|
{
|
|
case 'O':
|
|
case 'o':
|
|
if( (f=fopen(fname->strval,"w")) == NULL)
|
|
error(28);
|
|
m= OMODE;
|
|
break;
|
|
case 'I':
|
|
case 'i':
|
|
if( (f=fopen(fname->strval,"r")) == NULL)
|
|
error(28);
|
|
m= IMODE;
|
|
break;
|
|
case 'r':
|
|
case 'R':
|
|
if( (f=fopen(fname->strval,"a")) == NULL)
|
|
error(28);
|
|
m= RMODE;
|
|
break;
|
|
default:
|
|
printf("file mode %s\n",mode->strval);
|
|
error(29);
|
|
}
|
|
_chanwr= _chanrd= _fdtable[_chann].fd= f;
|
|
_fdtable[_chann].fname= fname->strval;
|
|
_fdtable[_chann].reclength= reclen;
|
|
_fdtable[_chann].mode= m;
|
|
#ifdef DEBUG
|
|
printf("file descr %d\n",f);
|
|
#endif
|
|
}
|
|
|
|
_ioeof(channel)
|
|
int channel;
|
|
{
|
|
FILE *fd;
|
|
char c;
|
|
if( channel<0 || channel >15) error(3);
|
|
fd= _fdtable[channel].fd;
|
|
if( fd==0)
|
|
error(3);
|
|
c=fgetc(fd);
|
|
if( feof(_fdtable[channel].fd) ) return(-1);
|
|
ungetc(c,fd);
|
|
return(0);
|
|
}
|
|
|
|
_close()
|
|
{
|
|
/* close all open files */
|
|
int i;
|
|
for(i=1;i<16;i++)
|
|
if( _fdtable[i].fd)
|
|
_clochn(i);
|
|
}
|