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tail.c
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66 lines (49 loc) · 1.14 KB
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#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "cola.h"
char* leer_linea(){
char* linea = NULL;
size_t cant = 0;
ssize_t lineas;
if((lineas = getline(&linea, &cant, stdin)) > 0){
return linea;
}
free(linea);
return NULL;
}
void tail(int cant_lineas){
char* linea = NULL, *linea_anterior;
size_t contador_lineas = 0;
cola_t* cola_lineas = cola_crear();
if(!cola_lineas) return;
while((linea = leer_linea()) != NULL){
if(contador_lineas == cant_lineas){
linea_anterior = cola_desencolar(cola_lineas);
free(linea_anterior);
}else{
contador_lineas++;
}
cola_encolar(cola_lineas, linea);
}
while(!cola_esta_vacia(cola_lineas)){
char* linea_actual = cola_desencolar(cola_lineas);
fprintf(stdout, "%s", linea_actual);
free(linea_actual);
}
cola_destruir(cola_lineas, NULL);
}
int main(int argc, char* argv[]){
if(argc != 2){
fprintf(stderr, "%s\n", "Cantidad de parametros erronea");
return 1;
}
int cant_lineas = atoi(argv[1]);
if(cant_lineas <= 0){
fprintf(stderr, "%s\n", "Tipo de parametro incorrecto");
return 1;
}
tail(cant_lineas);
return 0;
}