Programming

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main (argc, char *argv[])

{
char buf[20];
size_t nbytes;
ssize_t bytes_read;
int fd;

nbytes = sizeof(buf);
bytes_read = read(fd, buf, nbytes);

dump_buffer();

return 0;
}

void dump_buffer(void *buffer, int buffer_size)
{
int i;

for(i = 0;i < buffer_size;++i)
printf("%c", ((char *)buffer)[i]);
}

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main (argc, char *argv[])
{
        char buf[20];
        size_t nbytes;
        ssize_t bytes_read;
        int fd=open("filename", O_RDONLY);

        if(fd < 0)
        {
                perror("Couldn't open");
                return(1);
        }

        nbytes = sizeof(buf);
        bytes_read = read(fd, buf, nbytes); // you could just use sizeof(buf) here
        if(bytes_read <= 0)
        {
                perror("Couldn't read");
                close(fd);
                return(1);
        }

        printf("Read %d bytes\n", (int)bytes_read);

        write(STDOUT_FILENO, buf, bytes_read);
        close(fd);
        return(0);
}