strncpy函数，strncat函数

最新推荐文章于 2025-01-10 16:44:57 发布

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本文深入解析strncpy和strncat两个C语言字符串处理函数。strncpy用于安全地复制固定数量的字符，避免缓冲区溢出；strncat则用于连接字符串，同样限定字符数以增强安全性。文章通过实例说明如何使用这两个函数，并强调了在编程实践中考虑边界条件的重要性。

char * strncpy ( char * destination, const char * source, size_t num );

Copies the first num characters of source to destination. If the end of the source C string (which is
signaled by a null-character) is found before num characters have been copied, destination is padded
with zeros until a total of num characters have been written to it.
拷贝num个字符从源字符串到目标空间。
如果源字符串的长度小于num，则拷贝完源字符串之后，在目标的后边追加0，直到num个。

	char str1[10] = "hehe";
	char str2[100] = "sing dance rap baskertball";
	strncpy(str1, str2, 9);
	//9，做人留一线

在这里插入图片描述
在一定程度上避免访问越界

char * strncat ( char * destination, const char * source, size_t num );

Appends the first num characters of source to destination, plus a terminating null-character.
If the length of the C string in source is less than num, only the content up to the terminating null character is copied.
从源字符串中num个字符拼接到目标字符串，当源字符串小于num，在目标后面追加0，直到num