Function gzerror 

pub unsafe extern "C" fn gzerror(
    file: gzFile,
    errnum: *mut c_int,
) -> *const c_char

Available on crate feature gz only.

Retrieve the zlib error code and a human-readable string description of the most recent error on a gzip file stream.

Arguments

• file - A gzip file handle, or null
• errnum - A pointer to a C integer in which the zlib error code should be written, or null if the caller does not need the numeric error code.

Returns

• A pointer to a null-terminated C string describing the error, if file is non-null and has an error
• A pointer to an empty (zero-length), null-terminated C string, if file is non-null but has no error
• Null otherwise

Safety

file must be one of the following:

• A file handle obtained from gzopen or gzdopen.
• A null pointer.

If this function returns a non-null string, the caller must not modifiy or deallocate the string.

If errnum is non-null, it must point to an address at which a c_int may be written.