Safely get string input from user including spaces

Nikita Axyonov 发表于 Dev

Stack Overflow 32

I know that I can use gets(char *) to get string input from user with spaces included but I read that buffer overflow problem. Using strcpy, strcmp (and a few other functions) is not safe we should use strncpy, strncmp and explicitly mention the size of the input. Some guy on Stack Overflow told me that. So, I am worried about using gets for getting input from user or it's safe? If it's safe tell me I'll continue using it. If not then what is the other way getting spaced string input from user safely?

#include <stdio.h> 
#include <stdlib.h> 

int main()
{
  char *a[2]; 

  char b[] = "first";
  char c[] = "second"; 

  int s1; //,s2;

 // printf("\nLong you want your %s string to be: \n",b);
 //scanf("%d",&s1); fflush(stdin);

 //printf("\nLong you want your %s string to be: \n",c);
 // scanf("%d",&s1); fflush(stdin);

  int i;
  for(i=0; i<2; i++) {
    printf("\nLong you want your %s string to be: \n",b);
    scanf("%d",&s1);  fflush(stdin); 
    a[i] = (char *) malloc(s1*sizeof(char)); 
  }

  printf("\nEnter the first string: \n");
  scanf("%s", a[0]); fflush(stdin);

  printf("\nEnter the second string: \n");
  scanf("%s", a[1]); fflush(stdin);

  printf("\nThe first string is: %s\n", a[0]);
  printf("\nThe second string is: %s\n", a[1]);
}

µtex

Please do some research.. this http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1044652485&id=1043284385 may help you.

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编辑于2021-02-13

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