If the provided string is valid UTF-8, return a copy of it. If not, return a copy in which bytes that could not be interpreted as valid Unicode are replaced with the Unicode replacement character (U+FFFD).
For example, this is an appropriate function to use if you have received a string that was incorrectly declared to be UTF-8, and you need a valid UTF-8 version of it that can be logged or displayed to the user, with the assumption that it is close enough to ASCII or UTF-8 to be mostly readable as-is.
Available since: 2.52
String to coerce into UTF-8
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.
The maximum length of
strto use, in bytes. If
len< 0, then the string is nul-terminated.