#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void rev_file(char *, unsigned int);

int main(int argc, char **argv)
{
        char *ptr;
        unsigned int size, count = 0;
        FILE *fp;

        if(argc < 2)
        {
                printf("%s <file>n", argv[0]);
                return EXIT_FAILURE;
        }

        if(!(fp = fopen(argv[1], "r")))
                return EXIT_FAILURE;

        fseek( fp, 0L, SEEK_END );
        count = ftell( fp );  rewind(fp);

        if(!(ptr = malloc(count+1)))
                return EXIT_FAILURE;

        ptr[count] = '';fread(ptr, count, sizeof(char), fp);

        fclose(fp); reverse_file(ptr, count);

return EXIT_SUCCESS;
}

static void rev_file(char *base, unsigned int size)
{
        char *end = &base[size-1];
        if(*end == 'n')
        {
                *end = '';
                --end;
        }

        for( ; end >= base; --end)
                if(*end == 'n')
                {
                        *end = '';printf("%sn", end+1);
                }
                printf("%sn", base);
                free(base);
}

with regards,
 
P.Nirmal