lex [-t] [-n|-v]  [file...]

    

lex [-t] [-n|-v] [-P sym_prefix] [file...]

-P sym_prefix
    Use sym_prefix instead of yy as the prefix for all external names produced by lex. The names affected shall include yylex(), yymore(), yyless(), and yywrap(), and the variables yytext, yyleng, and yyin. In the remainder of this section, the symbols cited are referenced using their default names only as a notation convenience.
    If the -t option is not specified, write the resulting program to lex.sym_prefix.c instead of lex.yy.c.

    A text file containing C source code shall be written to the first applicable item in this list:
        

        
1. Standard output if the -t option is given

        
2. A file named lex.sym_prefix.c if the -P option is given

        
3. A file named lex.yy.c otherwise

        

      

Except for input(), unput(), and main(), all external and static names generated by lex shall begin with the prefix yy or YY.

The lex library interfaces need not support interfaces with other than the default yy symbol prefix.

The functions input(), unput(), and main() shall not be prefixed. All other external and static names generated by lex shall begin with sym_prefix if the -P option was specified, otherwise they shall begin with yy or YY.

When the -P option is used with a prefix other than yy, applications should not rely on the default versions of yywrap() and main() from the lex library, because those interfaces need only support scanners generated with the default symbol prefix.