Section 5.4.12.6. Use of the underscore character

All the externally accessible CIFtbx commands and variables terminate with the underscore character. This works well on most systems, but can cause occasional problems, because traditional Fortran does not include the underscore in the character set and some operating systems reserve the underscore as a system flag, for example to distinguish C-language library routines from those written in Fortran. If conversion is needed, and the local compiler allows long variable and subroutine names, then the simplest approach would be to make a local variant of CIFtbx in which every occurrence of underscore in a function, subroutine or variable name is changed to a distinctive character pattern (e.g. `CIF' or `qq'), but caution is needed, since there are many character strings used in the library that include the underscore. For example, in changing the variable loop_ to loopCIF, it would be a mistake to change the statement to