The strlcpy() function copies up to size - 1 characters from the NUL-terminated string src to dst, NUL-terminating the result. The strlcat () function appends the NUL-terminated string src to the end of dst .

2020年10月14日 · C语言标准库函数strlcpy，是更加安全版本的strcpy函数，在已知目的地址空间大小的情况下，把从src地址开始且含有'\0'结束符的字符串复制到以dest开始的地址空间,并不会造成缓冲区溢出。

2019年12月7日 · With the strlcpy() function, however, only dstsize characters maximum are copied, and the value returned is the size of string src. (The value returned is always the size of string src regardless of how many characters are copied.)

2024年9月11日 · strlcat is equivalent to writing the appended strings to a temporary infinitely-large buffer, and then doing a strlcpy from that buffer to the destination. strlcpy and strlcat were developed by Todd C. Miller and Theo de Raadt and first implemented in OpenBSD version 2.4.

2024年8月3日 · The strlcpy () and strlcat () functions copy and concatenate strings with the same input parameters and output result as snprintf (3). They are designed to be safer, more consistent, and less error prone replacements for the easily misused functions strncpy (3) and strncat (3).

Why strlcpy is not an improvement, but rather a different, and quite possibly worse compromise: Perceived advantages of strlcpy are: The first “advantage” is supposed to make programs more robust by ensuring that the resulting strings are always NUL terminated.

strlcpy(3bsd) strlcat(3bsd) Copy and catenate the input string into a destination string. If the destination buffer, limited by its size, isn't large enough to hold the copy, the resulting string is truncated (but it is guaranteed to be null-terminated).

strlcpy() copies up to dstsize - 1 characters from the string src to dst, NUL-terminating the result if dstsize is not 0. strlcat () appends string src to the end of dst . It will append at most dstsize - strlen(dst) - 1 characters.

The strlcpy() and strlcat() functions return the total length of the string they tried to create. For strlcpy () that means the length of src . For strlcat () that means the initial length of dst plus the length of src .

2025年3月9日 · 1) Copies the null-terminated byte string pointed to by src, including the null terminator, to the character array whose first element is pointed to by dest. The behavior is undefined if the dest array is not large enough. The behavior is undefined if the strings overlap.