Write a C program that counts the number of blanks in a text file using system calls

Write a C program that counts the number of blanks in a text file using system calls


#include<fcntl.h>
#include<sys/stat.h>

int main(int argc, char **argv)
{
   int fd1;
   int n,count=0;
   char buf;
   fd1=open(argv[1],O_RDONLY);
   while((n=read(fd1,&buf,1))>0)
   {
     if(buf==' ')
         count=count+1;
   }
   printf("\n Total Blanks= %d",count);
return (0);
}