This section explains library functions.

Some of the C99-language-expanded keywords (functions, macros, variable names, etc..) must be used in when the C99-language is selected. Such keywords are displayed by the mark of "<-lang=c99>" at the tables each the header-files in these sections. When you use these keywords in your program, at the time of compilations and library generations, please turn on the -lang=c99 option.