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portability bugfixes, minor changes

    1: /* front-end scanner for vmgen example
    2: 
    3:   Copyright (C) 2001 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: */
   21: 
   22: /* %option yylineno (flex option, implied by flex -l) */
   23: 
   24: %{
   25: #include <stdlib.h>
   26: #include <string.h>
   27: char *mystrdup(const char *s)
   28: {
   29:   char *t=malloc(strlen(s)+1);
   30:   return strcpy(t,s);
   31: }
   32: %}
   33: 
   34: %%
   35: [-();,+*&|<=!]	return yytext[0];
   36: :=	return BECOMES;
   37: func	return FUNC;
   38: return	return RETURN;
   39: end	return END;
   40: var	return VAR;
   41: if	return IF;
   42: then	return THEN;
   43: else	return ELSE;
   44: while	return WHILE;
   45: do	return DO;
   46: print	return PRINT;
   47: [0-9]+			{ yylval.num=strtol(yytext,NULL,10); return NUM; }
   48: [a-zA-Z\_][a-zA-Z0-9\_]*	{ yylval.string=mystrdup(yytext); return IDENT; }
   49: [ \t\n]	;
   50: [/][/].*	;
   51: .		yyerror("illegal character"); exit(1);
   52: %%