La memoire ne peut etre en etat written / read

#include<stdio.h>
#include <stdlib.h>
FILE* frdv ;
FILE* fmedic; 
FILE* fpa ;
FILE* test ;
typedef struct {
        int j ;
        int m ;
        int an ;
        }date ;

typedef struct patient {
        int num ;
        char nom[20];
        char prenom[20] ;
        char adr[30];
        date date_nai ;
        char lieu[15];
        char etat[10] ;
        }patient ;

typedef struct medic {
        int code ;
        char nom[15];
        int qua ;
        }medic ;

typedef struct rdv {
  int code ;
  date date_rdv ;
        }rdv ;

typedef patient *listpatient;  
typedef medic *listmedic ;
typedef rdv *listrdv ; 

listpatient ajouter_p ( listpatient tmp) 
 {
 
 printf("donner le numero du patient \n") ; 
 scanf("%d",&tmp->num) ; 
 printf("donner le nom du patient \n ") ; 
 scanf("%s",tmp->nom) ; 
 printf("donner le prenom du patient \n") ; 
 scanf("%s",tmp->prenom) ; 
 printf("donner l'adresse du patient \n'") ; 
 scanf("%s",tmp->adr) ; 
 printf("donner date naissance du patient JJ/MM/AN \n") ; 
 scanf("%d %d %d", &tmp->date_nai.j,&tmp->date_nai.m,&tmp->date_nai.an) ; 
 printf("donner lieu de naissance du patient \n") ; 
 scanf("%s",tmp->lieu) ; 
 printf("donner l'etat du patient \n'") ; 
 scanf("%s",tmp->etat) ;  


return(tmp) ;
}

void ajouter_patient()
{listpatient p; char v='o'; 

 fpa=fopen("patient.txt","a+");
 do{
 ajouter_p(p);
 fwrite(&p,sizeof(listpatient),1,fpa);
 printf("Ajouter un nouveaux patient: (O/N): \n ");
 scanf("%s", &v);
 }while(v=='o');
   
}

void supprimer_p()
{listpatient tmp=NULL,tmpp=NULL; int nm;
   
 test=fopen("test.txt","w+");
 fpa=fopen("patient.txt","r+");
 printf("Donner le numero de patient a supprimer: \n");
 scanf("%d",&nm);
 while(fread(&tmp,sizeof(listpatient),1,fpa))
 {
  if (tmp->num!=nm)
   fwrite(&tmp,sizeof(listpatient),1,test);
 };
 fclose(fpa);
 fclose(test);
 test=fopen("test.txt","rb");
 fpa=fopen("patient.txt","wb+");
 while(fread(&tmpp,sizeof(listpatient),1,test))
 {
  fwrite(&tmpp,sizeof(patient),1,fpa);
 };
 fclose(fpa);
 fclose(test);
}

void afficher_p(listpatient p)
{
 printf("Num patient %d",p->num) ;
 printf("Nom patient %s",p->nom) ; 
 printf("Prenom patient s",p->prenom) ;
 } 
 
void modifier_p(listpatient p)
{ listpatient tmp=p;int num;
   
 test=fopen("test.txt","wb+");
 fpa=fopen("patient.txt","rb+");
 printf("Le numero de patient a modifier: \n");
 scanf("%d",&num);
 while(fread(&tmp,sizeof(listpatient),1,fpa)){
  if (tmp->num==num)
   ajouter_p(tmp);
   fwrite(&tmp,sizeof(patient),1,test);
 }
 fclose(fpa);
 fclose(test);
 test=fopen("test.txt","rb");
 fpa=fopen("patient.txt","wb+");
 while(fread(&tmp,sizeof(patient),1,test)){
  fwrite(&tmp,sizeof(patient),1,fpa);
 }
 fclose(fpa);
 fclose(test);
}
 
void chercher_p(int nm)
{listpatient p ;
 fpa=fopen("patient.txt","rb");
 while(fread(&p,sizeof(patient),1,fpa))
 {
  if(p->num == nm)
   afficher_p(p);
 }
}

listrdv ajout_rdv(listrdv r)
{
 listrdv tmp=r; 
 printf("donner le numero du rendez-vous: ");
 scanf("%d",tmp->code); 
 printf("entrer la date de rendez-vous Jour/Mois/Annee:\n ");
 printf("Jour:\n");
 scanf("%d",tmp->date_rdv.j);
 printf("Mois:\n");
 scanf("%d",tmp->date_rdv.m);
 printf("Annee:\n");
 scanf("%d",tmp->date_rdv.an);
 return (tmp);
}
  
void ajouter_r(listrdv r){
 listrdv tmp=r ;
 char verif='o'; 
 frdv=fopen("rendezvous.txt","a+");
 do{
  ajout_rdv(tmp);
  fwrite(&tmp,sizeof(tmp),1,frdv);
  printf("Voulez vous ajouter un nouveau RDV(O/N) \n ");
  scanf("%d", &verif);
  }
 while(verif =='o');
 fclose(frdv);
   
  }



listrdv modif_r(listrdv r){
 listrdv tmp=r; listrdv rd=NULL ; listrdv rdvv=NULL ;
 int num;
 test=fopen("testf.txt","w+");
 frdv=fopen("RDV.txt","r+");
 printf("Donner le numero de patient ");
 scanf("%d",&num);
 while(fread(&tmp,sizeof(tmp),1,frdv)){
  if (tmp->code==num)
   ajout_rdv(rd);
   fwrite(&rd,sizeof(listrdv),1,test);
  }
 fclose(test);
 test=fopen("testf.txt","r");
 frdv=fopen("RDV.txt","w+");
 while(fread(&rdvv,sizeof(listrdv),1,test)){
 fwrite(&rdvv,sizeof(listrdv),1,frdv);
}
 fclose(frdv);
 fclose(test);
 }

void afficher_rendervous(listrdv r)
{ listrdv tmp=r ;
 printf("Code du RDV : %d \n",tmp->code);
 printf("Date est:%d/%d/%d\n",tmp->date_rdv.j,tmp->date_rdv.m,tmp->date_rdv.an);
   
}
   
void chercher_r(int num){
 frdv=fopen("RDV.txt","r");
 listrdv p;
 while(fread(&p,sizeof(listrdv),1,frdv)){
  if(p->code == num)
   afficher_rendervous(p);
  }
 fclose(frdv);
 }


listmedic saisie_m(listmedic tmp)
{   
 printf("Le code du MEDIC:\n ");
 scanf("%d",tmp->code); 
 printf("Le nom du MEDIC: \n ");
 scanf("%s",tmp->nom);
 printf("La quantité du MEDIC: \n  ");
 scanf("%d",tmp->qua);
return (tmp);
}
  
void afficher_m(listmedic m)
{ listmedic tmp=m ;
 printf("Code :%d\n",tmp->code);
 printf("Nom:%s\n",tmp->nom);
 printf("Quantité :%d\n",tmp->qua);
}
   

void ajouter_m()
{ listmedic tmp=NULL; char v='o'; 
 
 fmedic=fopen("medic.txt","a+");
 do{
 saisie_m(tmp);
 fwrite(&tmp,sizeof(listmedic),1,fmedic);
 printf("Voulez vous ajouter un nouveau medicament: (O/N): \n ");
 scanf("%s", &v);
 }while(v == 'o');
   
}
  
  
void supprimer_m(listmedic m)
{  listmedic tmp=NULL,tmpp=NULL; int num;
   
 test=fopen("test.txt","w+");
 fmedic=fopen("medic.txt","r+");
 printf("Donner code du MEDIC a supprimer: \n");
 scanf("%d",&num);
 while(fread(&tmp,sizeof(listmedic),1,fmedic))
 {
  if (tmp->code!= num)
   fwrite(&tmp,sizeof(listmedic),1,test);
 }
 fclose(fmedic);
 fclose(test);
 test=fopen("test.txt","rb");
 fmedic=fopen("medic.txt","wb+");
 while(fread(&tmpp,sizeof(listmedic),1,test))
 {
  fwrite(&tmpp,sizeof(listmedic),1,fmedic);
 }
 fclose(fmedic);
 fclose(test);
}
   
void chercher_m(int num)
{ listmedic tmp=NULL;
 fmedic=fopen("medicament.txt","rb");
 
 while(fread(&tmp,sizeof(listmedic),1,fmedic))
 {
 if(tmp->code == num)
  afficher_m(tmp);
 }
fclose(fmedic) ;  
}






int main()
{
listpatient p=NULL ; listrdv rdv=NULL ; listpatient pa=NULL ; listmedic m=NULL ;
int rep,choi,choix,i,num;

do{

  printf("***************Bienvenue sur notre cabinet***************\nVeuiller saisir:\n(1)Gestion des patients\n(2)Gestion des rendez-vous\n(3)Gestion des medicaments \n");
  scanf("%d",&rep);
  switch (rep){
   case 1: printf("(1)Ajouter un patient \n (2)Supprimer un patient \n (3)Chercher un patient \n (4)Modifier un patient \n ") ;
      scanf("%d",choi) ;
     switch (choi) {
           case 1:ajouter_p(p) ; 
       case 2:supprimer_p(p) ; 
       case 3:chercher_p(i) ;
       case 4:modifier_p(p) ;
          }     
   break;
   
   case 2: printf("(1)Ajouter un Rendez-Vous \n (2)Modifier un Rendez-vous \n ") ;
        scanf("%d",&choix) ;
        switch(choix){
             case 1:ajouter_r(rdv) ; 
             case 2:modif_r(rdv) ;
             case 3:chercher_r(i);
               }
   break;
   case 3: printf("(1)Ajouter un medicament \n (2)Supprimer un medicament \n (3)Chercher un medicament \n") ;
        scanf("%d",&num) ; 
        switch(num){
             case 1: ajouter_m();
         case 2: supprimer_m(m);
       case 3: chercher_m(i);
       }
   break;
   }
    }while (rep!=3);
return 0; 
}