const char * idn2_check_version(const char * req_version);
- const char * req_version
version string to compare with, or NULL.
Check IDN2 library version. This function can also be used to read
out the version of the library code used. See IDN2_VERSION for a
suitable req_version string, it corresponds to the idn2.h header
file version. Normally these two version numbers match, but if you
are using an application built against an older libidn2 with a
newer libidn2 shared library they will be different.
Check that the version of the library is at
minimum the one given as a string in req_version and return the
actual version string of the library; return NULL if the
condition is not met. If NULL is passed to this function no
check is done and only the version string is returned.