programa veiculos

[thematrix]

olá amigos estou fazendo um algoritmos para cadastrar,buscar, e alterar, nomes, modelo de carro, placa, combustivel, ano e etc, já esta praticamente feito, so que tem um pequeno probleminha, na função busca tenho uma opção de menu pra listar os carros com placa que iniciam com a letra 'a' e tenham o final 02 ou 47, consegui fazer a função perfeitamente, mas se cadastro 2 carros com a mesma condição de placa, ele apenas lista o primeiro carro, a variavel compara não recebe a proxima placa indicada pelo ponteiro, peço ajuda ;D

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
void insere();
void wait();
void busca();
void alterar();
void lista_d();
struct cadastro{
    char nome[256];
    char modelo[256];
    char n_chassi[256];
    int ano;
    char placa[256];
    char cor[256];
    char gas[256];
    cadastro *prox;
}*Cab, *fim;
main()
{
    Cab = fim = NULL;
    int op;

    printf("################DETRAN##############\n");
    while(op != 4){
        printf("1 - cadastrar\n");
        printf("2 - buscar\n");
        printf("3 - alterar\n");
        printf("4 - sair\n");
        printf(">");
        scanf("%d",&op);
        system("clear");
        switch(op)
        {
            case 1:
                insere();
                system("clear");
                break;
            case 2:
                busca();
                system("clear");
                break;
            case 3:
                alterar();
                system("clear");
                break;
            case 4:
                exit(0);
                break;
        }


    }
}


void busca()
{
    int opcao;
    cadastro *p2;
    while(opcao!= 3)
    {
        system("clear");
        printf("O que deseja fazer?\n");
        printf("1 - Listar todos cadastros\n");
        printf("2 - listar\n");
        printf("3 - Voltar ao menu principal\n");
        scanf("%d",&opcao);
        switch(opcao)
        {
            case 1:
                p2 = Cab;
                printf("\nCADASTRADOS\n");
                printf("----------------------------------\n\n");
                while(p2 != NULL)
                {
                    printf("NOME: %s\nMODELO: %s\nPLACA: %s\n Chassi: %s\n COR: %s\nCOMBUSTIVEL: %s\nANO: %d\n",p2->nome,p2->modelo,p2->placa,p2->n_chassi,p2->cor,p2->gas,p2->ano);
                    printf("----------------------------------\n");
                    p2 = p2->prox;
                }
                wait();
                break;
            case 2:
                p2 = Cab;
                int opcao1;
                int x,busca2;
                char busca[256];
                printf("1 - Buscar pelo Nome\n");
                printf("2 - Buscar pelo Modelo\n");
                printf("3 - Buscar pela Placa\n");
                printf("4 - Buscar ANO 1980 a disel\n");
                printf("5 - Listar placas 'A' final 02|47\n");
                printf("6 - Voltar\n");
                scanf("%d",&opcao1);
                if(opcao1 == 6) break;
                if(opcao1 == 1)
                {
                    wait();
                    x = 0;
                    printf("Digite o nome que deseja procurar: ");
                    fgets(busca,255,stdin);
                    while(p2 != NULL)
                    {
                        if(!strcmp(p2->nome,busca))
                        {
                            printf("NOME: %s\nMODELO: %s\nPLACA: %s\n Chassi: %s\n COR: %s\nCOMBUSTIVEL: %s\nANO: %d\n",p2->nome,p2->modelo,p2->placa,p2->n_chassi,p2->cor,p2->gas,p2->ano);
                            printf("----------------------------------\n");
                            p2 = p2->prox;
                            x = 1;
                        }
                        else
                        {
                            p2 = p2->prox;
                        }
                    }
                    if(x==0)
                    {
                        printf("Nenhum Cadastro encontrado!\n");
                        wait();
                        break;
                    }
                    else
                    {
                        wait();
                        break;
                    }
                }
                else if(opcao1 == 2)
                {
                    wait();
                    x = 0;
                    printf("Digite o modelo:");
                    fgets(busca,255,stdin);
                    while(p2 != NULL)
                    {
                        if(!strcmp(p2->modelo,busca))
                        {
                            printf("NOME: %s\nMODELO: %s\nPLACA: %s\n Chassi: %s\n COR: %s\nCOMBUSTIVEL: %s\nANO: %d\n",p2->nome,p2->modelo,p2->placa,p2->n_chassi,p2->cor,p2->gas,p2->ano);
                            printf("----------------------------------\n");
                            p2 = p2->prox;
                            x = 1;
                        }
                        else
                        {
                            p2 = p2->prox;
                        }
                    }
                    if(x==0)
                    {
                        printf("Nenhum cadastro encontrado!\n");
                        wait();
                        break;
                    }
                    else
                    {
                        wait();
                        break;
                    }
                }
                else if(opcao1 == 3)
                {
                    wait();
                    x = 0;
                    printf("Digite uma placa para pesquisar: ");
                    fgets(busca,255,stdin);
                    while(p2 != NULL)
                    {
                        if(!strcmp(p2->placa,busca))
                        {
                            printf("NOME: %s\nMODELO: %s\nPLACA: %s\n Chassi: %s\n COR: %s\nCOMBUSTIVEL: %s\nANO: %d\n",p2->nome,p2->modelo,p2->placa,p2->n_chassi,p2->cor,p2->gas,p2->ano);
                            printf("----------------------------------\n");
                            p2 = p2->prox;
                            x = 1;
                        }
                        else
                        {
                            p2 = p2->prox;
                        }
                    }
                    if(x==0)
                    {
                        printf("Nenhum cadastro encontrado!\n");
                        wait();
                        break;
                    }
                    else
                    {
                        wait();
                        break;
                    }
                }
                else if(opcao1 == 4)
                {
                    wait();
                    x = 0;
                    printf("digite o combustivel:");
                    fgets(busca,255,stdin);
                    busca2 = 1980;
                    while(p2 != NULL)
                    {
                        if(!strcmp(busca,p2->gas) && busca2 <= p2->ano)
                        {
                            printf("NOME: %s\nPLACA:%s\n",p2->nome,p2->placa);
                            printf("----------------------------------\n");
                            p2 = p2->prox;
                            x = 1;
                        }
                        else
                        {
                            p2 = p2->prox;
                        }
                    }
                    if(x==0)
                    {
                        printf("Nenhum cadastro encontrado!\n");
                        wait();
                        break;
                    }
                    else
                    {
                        wait();
                        break;
                    }
                }
                else if(opcao1 == 5)
                {
                    wait();
                    x = 0;
                    char letra = 'a';
                    char temp[255];
                    int conta,i=0,j=0;
                    char *compara;
                    compara = temp;
                    conta = strlen(p2->placa);
                    while(p2 != NULL)
                    {
                        for(i=0;i<conta;i++){
                            compara[j++] = p2->placa[i];
                            compara[j]  = '';
                        }
                        if(compara[0] == letra && compara[5]=='0' && compara[6]=='2' || compara[5] == '4' && compara[6] == '7')
                        {
                            printf("NOME: %s\nMODELO: %s\nPLACA: %s\n Chassi: %s\n COR: %s\nCOMBUSTIVEL: %s\nANO: %d\n",p2->nome,p2->modelo,p2->placa,p2->n_chassi,p2->cor,p2->gas,p2->ano);
                            printf("----------------------------------\n");
                            printf("compara = %s , conta = %d\n",compara,i);
                            p2 = p2->prox;
                            x = 1;
                        }

                        else
                        {
                            p2 = p2->prox;
                        }
                        
                    if(x==0)
                    {
                        printf("Nenhum cadastro encontrado!\n");
                        wait();
                        break;
                    }

                    else
                    {
                        wait();
                        break;
                    }



                }
                }

                break;
            case 6:
                break;
            default:
                printf("Opcao não existe\n");
                wait();
        }
    }
}

listei apenas a função busca e o programa main para analizarem, so estou na duvida da opcao==5 mesmo, e desculpe mas não consegui colocar o codigo no codebox.

[thematrix]

obs uso IDE CODE BLOCKS