#include<stdio.h>
#include<fcntl.h>
#include<unistd.h>
#include<string.h>
#include<ctype.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/mman.h>

int main(){
	int fd = open("mmapped_file.txt",O_RDWR);
	char *loc = mmap(0, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if ((ssize_t)loc == -1){
		perror("Mapping File");
		goto out;
	}
	printf("File contents from the beginning:  %s\n", loc);
	for(int i = 0; i < strlen(loc); i++)
		if(i == 0 || loc[i-1] == ' ')
			loc[i] = toupper(loc[i]);
	
	munmap(loc, 0);
out:
	close(fd);
	return 0;
}