#include <stdio.h>
#define MAX_NBR_ELEM 5
#define MAX_NBR_CHAR 9
char ringbuffer[MAX_NBR_ELEM][MAX_NBR_CHAR]; //char matrix with size for 10char strings
int nextToPut=0;
int nextToGet=0;
int nbrOfElements=0;
int isFull=0;

void put(char* c){
        int i=0;

        printf("nextToPut: %d\n",nextToPut);
        if(++nextToPut>=MAX_NBR_ELEM){
                nextToPut=0;
        }

        while(i<9){
                ringbuffer[nextToPut][i]=c[i];
                i++;
        }
        printf("string copied\n");
//      nextToPut++;
        nbrOfElements++;
        if(nbrOfElements==MAX_NBR_ELEM){
                isFull=1;
        }
}
char* get(void){
        if(++nextToGet>=MAX_NBR_ELEM){
                nextToGet=0;
        }
        if((ringbuffer[nextToGet]!=NULL)){
                nextToGet++;
                //              nextToPut--;
                nbrOfElements--;
                isFull=0;
                return ringbuffer[nextToGet-1];
        }
        else{
                return NULL;
        }
}
int main(){
        char* pChar;
        char* myString0="hello0";
        char* myString1="hello1";
        char* myString2="hello2";
        char* myString3="hello3";
        char* myString4="hello4";
        char* myString5="hello5";
        char* myString6="hello6";
        char* myString7="hello7";
        put(myString0);
        put(myString1);
        put(myString2);
        put(myString3);
        put(myString4);
        put(myString5);
        put(myString6);
        put(myString7);
        printf("nbrOfElements: %d\n",nbrOfElements);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        pChar=get();
printf("fetched from buffer: %s\n",pChar);
        printf("nbrOfElements: %d\n",nbrOfElements);
}

OUTPUT:
bkw@sandbox:~/code/buffertest$ ./a.out
nextToPut: 0
string copied
nextToPut: 1
string copied
nextToPut: 2
string copied
nextToPut: 3
string copied
nextToPut: 4
string copied
nextToPut: 0
string copied
nextToPut: 1
string copied
nextToPut: 2
string copied
nbrOfElements: 8
fetched from buffer: hello5
fetched from buffer: hello7
fetched from buffer: hello4
fetched from buffer: hello6
fetched from buffer: hello3
fetched from buffer: hello4
fetched from buffer: hello6
fetched from buffer: hello3
nbrOfElements: 0