fix buffer overflow
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parent
e3f5691462
commit
ff70e7df27
33
src/sort.c
33
src/sort.c
@ -16,6 +16,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <string.h>
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#include "random.h"
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#include "timer.h"
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#include "bubble_sort.h"
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@ -66,6 +67,34 @@ void print_array(int *array, int n) {
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fprintf(stdout, "\n\n");
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}
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/**
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* Leer el buffer de stdin y guardar el valor si es numerico
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* @param variable Donde se guarda el valor del stdin
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* @return Retorna 1 si es exitosa ó 0 si falla
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*/
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int read_buffer(int *variable) {
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char buffer[12];
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while (1) {
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if (fgets(buffer, 12, stdin) != NULL) {
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if (buffer[strlen(buffer) - 1] == '\n') {
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buffer[strlen(buffer) - 1] = '\0';
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break;
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}
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}
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}
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char **check = malloc(sizeof(char**));
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long input = strtol(buffer, check, 10);
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if (*check[0] == '\0') {
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free(check);
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*variable = (int) input;
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return 1;
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}
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else {
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free(check);
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return 0;
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}
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}
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/**
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* Liberar la memoria al salir
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*/
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@ -180,9 +209,7 @@ int main (int argc, char **argv) {
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if (elegir) {
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opt = 0;
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fprintf(stdout, "Elegir elemento %lli: ", i + 1);
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while (!fscanf(stdin, "%d", &opt)) {
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// Falló, pide de nuevo después de limpiar stdin
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while ((opt = getchar()) != '\n' && opt != EOF) { }
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while (!read_buffer(&opt)) {
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fprintf(stdout, "Número invalido! Tiene que ser mayor de 1!\n");
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fprintf(stdout, "Elegir elemento %lli: ", i + 1);
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}
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