int check_main(FILE *fp)

{

char str[]={'a','i','n','('};

int i,flag=0;

char x;

for(i=0;i<4;i++)

{

x=fgetc(fp);

if(x==str[i])

continue;

else

{

flag=1;

}

}

if(flag==1)

{

fseek(fp,-4,SEEK_CUR);

return -1;

}

else

{

return 1;

}

}

void modify(FILE *fp)

{

FILE *ft;

ft=fopen("copy.c","w");

char ch;

int count=1,flag=0,no=0;

fputs("#include<stdio.h>\n#include<signal.h>\n#include<stdlib.h>\n",ft);

fputs("int ABCDEF=0;\n",ft);

fprintf(ft,"void sig_handler(int signum){\n");

fprintf(ft,"printf(\"Segmentation fault arrived at line=");

fputs("%d\\n\",ABCDEF);\n",ft);

fputs("exit(0);\n}\n",ft);

while((ch=fgetc(fp))!=EOF)

{

if(ch=='{')

no++;

if(ch=='}'&&no>0)

no--;

if(ch=='m')

{

int ret=check_main(fp);

if(ret==1)

{

fputs("main(",ft);

while((ch=fgetc(fp))!='{')

{

if(ch=='\n')

count++;

fputc(ch,ft);

}

if(ch=='{')

no++;

fputc(ch,ft);

fputs("signal(SIGSEGV,sig_handler);",ft);

continue;

}

}

if(ch=='\n')

{ count++;

//printf("count=%d\n",count);

fseek(fp,-2,SEEK_CUR);

ch=fgetc(fp);

if(ch==')'||ch=='>'||ch=='}')

flag=1;

ch=fgetc(fp);

if(!flag&&no>0)

fprintf(ft,"\nABCDEF=%d;\n",count);

flag=0;

}

fputc(ch,ft);

}

fclose(ft);

// fseek(ft,5,SEEK_SET);

// printf("%c\n",fgetc(ft));

// while(fgetc(ft)!='{')

// ;

// fputs("signal(SIGSEGV,sig_handler);",ft);

/* fscanf(ft,"%s",temp);

printf("%s\n",temp);

char str[]="int main()";

int i=10;

while(i--)

{

if(strcmp(temp,str)==0)

{

printf("sdjf\n");

fputs("hello",ft);

break;

}

fscanf(fp,"%s",temp);

printf("%s\n",temp);

}

*/

}