The document describes a macroprocessor program that takes macro definitions from a MACRO.txt file and expands them in an INPUT.txt file. It scans the MACRO.txt file to build name, definition, and parameter tables. When it finds a macro call in INPUT.txt, it substitutes the parameters into the macro body from the tables and prints the expanded output.

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Date :….............
MACROPROCESSOR
AIM:
ALGORITHM:

2. Expno:………….
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CODING:
#include<stdio.h>
#include<conio.h>
#include<string.h>
void expandmacro();
char a,p1[10],p2[10],p3[10], p[10],para[10][10];
int n,i=0,j=1,y=0,x=0;
void main()
{
FILE *fmac,*fnam,*fdef;
char a,label[10],opcode[10],operand[50],p1[10],p2[10],p3[10], p[10],para[10][10];
int n,i=0,j=1,y=0,x=0;
fmac=fopen("macro.txt","r");
fnam=fopen("namtab.txt","w");
fdef=fopen("deftab.txt","w");
do
{
fscanf(fmac,"%s%s%s",label,opcode,operand);
if(strcmp(opcode,"MACRO")==0)
{
fprintf(fnam,"%sn",label);
fprintf(fdef,"%st%sn",label,operand);
n=strlen(operand);
for(i=0;i<=n;i++)
{
a=operand[i];
if(a!=',')
{
para[j][y++]=a;
}
if(a==',')
{
para[j][y]='0';
y=0;
j++;
}
}
do
{
fscanf(fmac,"%s%s%s",label,opcode,operand);
for(i=1;i<=j;i++)
{
if(strcmp(para[i],operand)==0)
{

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fprintf(fdef,"%st?%dn",opcode,i);
}
}
if(operand[0]!='&')
fprintf(fdef,"%st%sn",opcode,operand);
}while(strcmp(opcode,"MEND")!=0);
}
}
while(!feof(fmac));
fcloseall();
expandmacro();
}
void expandmacro()
{
FILE *finp,*fnam,*fdef,*farg;
int flag=0;
char mname[10],label[10],opcode[10],operand[50];
finp=fopen("input.txt","r");
fnam=fopen("namtab.txt","r");
fdef=fopen("deftab.txt","r");
farg=fopen("argtab.txt","w");
fscanf(fnam,"%s",mname);
do
{
fscanf(finp,"%s%s%s",label,opcode,operand);
if(strcmp(mname,opcode)==0)
{
flag=1;
if(flag==1)
{
printf("%st%st%sn",label,opcode,operand);
n=strlen(operand);
for(i=0;i<=n;i++)
{
a=operand[i];
if(a!=',')
{
para[j][y++]=a;
}
if(a==',')
{
para[j][y]='0';
y=0;
j++;

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}
}
for(i=1;i<=j;i++)
fprintf(farg,"%sn",para[i]);
fclose(farg);
flag=0;
}
fscanf(fdef,"%s%s",opcode,operand);
farg=fopen("argtab.txt","r");
if(strcmp(opcode,mname)==0)
{
do
{
fscanf(fdef,"%s%s",opcode,operand);
if(strcmp(operand,"?1")==0)
{
fscanf(farg,"%s",p);
strcpy(operand,p);
rewind(farg);
}
if(strcmp(operand,"?2")==0)
{
fscanf(farg,"%s%s",p,p1);
strcpy(operand,p1);
rewind(farg);
}
if(strcmp(operand,"?3")==0)
{
fscanf(farg,"%s%s%s",p,p1,p2);
strcpy(operand,p2);
rewind(farg);
}
printf("_t%st%sn",opcode,operand);
} while(strcmp(opcode,"MEND")!=0);
}
}
else
printf("%st%st%sn",label,opcode,operand);
}while(!feof(finp));
fcloseall();
}

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Date :….............
INPUT FILES:
MACRO:
COPY START 0
RDBUFF MACRO &INDEV,&BUFADR,&RECLTH
- CLEAR X
- CLEAR A
- CLEAR S
- LDT 4096
- TD &INDEV
- JEQ *-3
- RD &INDEV
- COMPR A,S
- JEQ *+11
- STCH &BUFADR
- TIXR T
- JLT *-19
- STX &RECLTH
- MEND-
INPUT PROGRAM:
FIRST STL RETADR
CLOOP RDBUFF F1,BUFFER,LENGTH
- LDA LENGTH
- COMP #0
- JEQ ENDFIL
ENDFIL J @RETADR
RETADR RESW 1
LENGTH RESW 1
BUFFER RESB 4096
- END FIRST

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Date :….............
OUTPUT:
FIRST STL RETADR
CLOOP RDBUFF F1,BUFFER,LENGTH
- CLEAR X
- CLEAR A
- CLEAR S
- LDT 4096
- TD F1
- JEQ *-3
- RD F1
- COMPR A,S
- JEQ *+11
- STCH BUFFER
- TIXR T
- JLT *-19
- STX LENGTH
- MEND -
ENDFIL J @RETADR
RETADR RESW 1
LENGTH RESW 1
BUFFER RESB 4096
- END FIRST
RESULT: