C99：非标准函数的自定义实现

Question

In my project, I want to use a non-standard library function, which which may not be defined on certain systems. In my case, it is strlcpy .

From man strcpy :

Some systems (the BSDs, Solaris, and others) provide the following function:

    size_t strlcpy(char *dest, const char *src, size_t size);

...

My system does not implement strlcpy , so I rolled my own. All is well, until compiling on a system that already has strlcpy defined: error: conflicting types for strlcpy .

My question: how can I implement a function that may cause naming conflicts down the road? Can I use some directive like #ifdef some_macro(strlcpy) , or am I simply left with renaming strlcpy to my_strlcpy ?

Answer 1

check if you need to include.

Example - the list of systems will be much longer I think

#if !defined(__FreeBSD__)
#include "mystring.h"
#endif