“strcpy"和“strcpy_s"之间的区别?

Difference between #39;strcpy#39; and #39;strcpy_s#39;?(“strcpy和“strcpy_s之间的区别?)

问题描述

当我尝试使用 strcpy 复制字符串时，它给了我一个编译错误.

When i tries to use strcpy to copy a string it gave me a compile error.

error C4996 'strcpy': This function or variable may be unsafe.
 
Consider using `strcpy_s` instead. To disable deprecation, 
use `_CRT_SECURE_NO_WARNINGS`. See online help for details.

strcpy 和 strcpy_s 有什么区别?

推荐答案

strcpy 是一个不安全的函数.当您尝试使用 strcpy() 将字符串复制到不足以容纳它的缓冲区时，会导致缓冲区溢出.

strcpy is a unsafe function. When you try to copy a string using strcpy() to a buffer which is not large enough to contain it, it will cause a buffer overflow.

strcpy_s() 是 strcpy() 的安全增强版.使用 strcpy_s，您可以指定目标缓冲区的大小，以避免复制期间缓冲区溢出.

strcpy_s() is a security enhanced version of strcpy(). With strcpy_s you can specify the size of the destination buffer to avoid buffer overflows during copies.

char tuna[5];  // a buffer which holds 5 chars incluing the null character.
char salmon[] = "A string which is longer than 5 chars";

strcpy( tuna, salmon ); // This will corrupt your memory because of the buffer overflow.

strcpy_s( tuna, 5, salmon ); // strcpy_s will not write more than 5 chars.

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