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