//CREATION OF SINGLE PASS ASSEMBLER//
#include
#include
#include
struct a
{
char b[10][10];
}source[10];
struct a symtab[10];
struct a reg[10];
struct a opcode[10];
FILE *f1,*f2,*f3,*f4;
int prolines,reglines,oplines,symlines,loc;
void main ()
{
int i,h,k=0,x,y,j,w;
char ch;
f1=fopen("source1.txt","r");
f2=fopen("register.txt","r");
f3=fopen("opcodes.txt","r");
f4=fopen("symbol.txt","w");
clrscr();
printf("\n the source program \n");
while(!feof(f1))
{
for(i=0;i<4;i++)
{
fscanf(f1,"%s",&source[k].b[i]);
printf("%s",source[k].b[i]);
printf("\t");
}
printf("\n");
k++;
}
getch();
clrscr();
prolines=k;
k=0;
printf("\n register table\n");
while(!feof(f2))
{
for(i=0;i<2;i++)
{
fscanf(f2,"%s",®[k].b[i]);
printf("%s",reg[k].b[i]);
printf("\t");
}
printf("\n");
k++;
}
getch();
clrscr();
reglines=k;
k=0;
printf("\n opcode table\n");
while(!feof(f3))
{
for(i=0;i<2;i++)
{
fscanf(f3,"%s",&opcode[k].b[i]);
printf("%s",opcode[k].b[i]);
printf("\t");
}
printf("\n");
k++;
}
getch();
clrscr();
oplines=k;
loc=atoi(source[0].b[3]);
printf("\nsymbol table\n");
for(i=0;i<10;i++)
{
if(strcmp(source[i].b[0],"*")!=0)
{
fprintf(f4,"%s\t%d\n",source[i].b[0],(loc+i)-1);
printf("%s\t%d\n",source[i].b[0],(loc+i)-1);
}
printf("\n");
fprintf(f4,"\n");
}
getch();
clrscr();
fclose(f1);
fclose(f2);
fclose(f3);
fclose(f4);
f4=fopen("symbol.txt","r");
k=0;
while(!feof(f4)) //creation of symbol table struct
{
for(i=0;i<2;i++)
{
fscanf(f4,"%s",&symtab[k].b[i]);
}
k++;
}
symlines=k;
printf("the assembeled code is \n");
prolines=prolines-2;//except start and end
ch=source[7].b[2][0];
for(i=1;i{
w=x=y=h=0;
printf("%d\t+\t",(loc+i)-1); //printing 1st col
for(j=0;j{
if(strcmp(opcode[j].b[0],source[i].b[1])==0)
{
printf("%d\t",atoi(opcode[j].b[1])); //printing opcode
h=1;
}
}
if(h!=1)
printf("0\t");
if(source[i].b[2][0]==ch)
{
w=1;
printf("0\t%c",source[i].b[2][1]);
}
for(j=0;j{
if(strcmp(reg[j].b[0],source[i].b[2])==0)
{ //printing reg number
printf("%d\t",atoi(reg[j].b[1]));
x=1;
}
}
if(x!=1 && w!=1)
printf("0\t");
for(j=0;j{
if(strcmp(symtab[j].b[0],source[i].b[3])==0)
{
printf("%d",atoi(symtab[j].b[1]));
y=1;
}
}
if(y!=1&&w!=1)
printf("000");
printf("\n");
}
fclose(f4);
getch();
}
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