HP C Programmer's Guide (92434-90009)

Chapter 7 167

Using C Programming Tools

HP Speciﬁc Features of lex and yacc

The following native language support features have been added to the HP C lex and yacc

tools:

• LC_CTYPE and LC_MESSAGES environment variable support in lex - Determines the size

of the characters and language in which messages are displayed while you use lex.

• -m command line option for lex - Speciﬁes that multibyte characters may be used

anywhere single byte characters are allowed. You can intermix both 8-bit and 16-bit

multibyte characters in regular expressions if you enable the -m command line option.

• -w command line option for lex - Includes all features in -m and returns data in the

form of the wchar_t data type.

• %l <locale> directive for lex - Speciﬁes the locale at the beginning of the deﬁnitions

section. Any valid locale recognized by the setlocale function can be used. This

directive is similar to using the LC_CTYPE environment variable. To receive wchar_t

support with %l, use the -w command line option.

• LC_CTYPE environment variable support in yacc - Determines the native language set

used by yacc and enables multibyte character sets. Multibyte characters can appear in

token names, on terminal symbols, strings, comments, or anywhere ASCII characters

can appear, except as separators or special characters.

• If you see the diagnostic message yacc stack overflow, then add the macro

#define RUNTIME_YYMAXDEPTH

at the beginning of the user subroutine section in the .y ﬁle.