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ag.c
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ag.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#define MAX 512
#define BUFFERSIZE 50
struct venda
{
int qtd;
double montante;
};
typedef struct venda* Venda;
struct artigo
{
int cod;
double montante;
int tamanhoStr;
};
typedef struct artigo* mArtigo;
ssize_t readln (int fd, void *buf, size_t nbyte) {
nbyte--;
char *cbuf = (char*) buf;
int i;
int rd = 1;
off_t foundnl = 0;
rd = read (fd, cbuf, nbyte);
for (i = 0; i < rd; i++)
if (cbuf[i] == '\n'){
foundnl = 1;
break;
}
cbuf[i] = 0;
lseek (fd, (i - rd) + foundnl, SEEK_CUR);
return (foundnl == 1 ? i : -i);
}
int main(){
int f, i, aux;
int codigo, quantidade;
double montante;
char buffer[BUFFERSIZE];
char* strAux = malloc(sizeof(char) * 20);
const time_t timer = time(NULL);
Venda* arrayVendas;
mArtigo artg = malloc(sizeof(struct artigo));
if((f = open("ARTIGOS", O_RDONLY)) == -1)
{
perror("open artigos");
exit(-1);
}
lseek (f, -sizeof(struct artigo), SEEK_END);
read(f, artg, sizeof(struct artigo));
close(f);
arrayVendas = (Venda*)malloc(sizeof(struct venda*) * artg->cod);
for (i = 0; i < artg->cod; ++i)
{
arrayVendas[i] = malloc(sizeof(struct venda));
arrayVendas[i]->qtd = 0;
arrayVendas[i]->montante = 0;
}
while(1){
readln (0, buffer, BUFFERSIZE);
if(strlen(buffer) == 0) break;
strAux = strtok(buffer, " ");
codigo = atoi(strAux);
strAux = strtok(NULL, " ");
quantidade = atoi(strAux);
strAux = strtok(NULL, " ");
montante = atof(strAux);
arrayVendas[codigo-1]->qtd += quantidade;
arrayVendas[codigo-1]->montante += montante;
}
if((f = open(ctime(&timer), O_CREAT | O_RDWR, 0666)) == -1)
{
perror("criar agregador");
exit(-1);
}
i = 0;
while(i < artg->cod)
{
if (arrayVendas[i]->qtd)
{
aux = i + 1;
write(f, &aux, sizeof(int));
write(f, arrayVendas[i], sizeof(struct venda));
}
i++;
}
close(f);
free(artg);
free(arrayVendas);
return 0;
}