solanum-vs-hackint-and-charybdis/ircd/ircd_parser.y

/* This code is in the public domain.
 * $Nightmare: nightmare/src/main/parser.y,v 1.2.2.1.2.1 2002/07/02 03:42:10 ejb Exp $
 * $Id: ircd_parser.y 871 2006-02-18 21:56:00Z nenolod $
 */

%{
#include <sys/types.h>
#include <sys/stat.h>

#include <netinet/in.h>

#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#define WE_ARE_MEMORY_C
#include "stdinc.h"
#include "setup.h"
#include "common.h"
#include "ircd_defs.h"
#include "config.h"
#include "client.h"
#include "modules.h"
#include "newconf.h"

#define YY_NO_UNPUT

int yyparse(void);
void yyerror(const char *);
int yylex(void);

static time_t conf_find_time(char*);

static struct {
	const char *	name;
	const char *	plural;
	time_t	val;
} ircd_times[] = {
	{"second",     "seconds",    1},
	{"minute",     "minutes",    60},
	{"hour",       "hours",      60 * 60},
	{"day",        "days",       60 * 60 * 24},
	{"week",       "weeks",      60 * 60 * 24 * 7},
	{"fortnight",  "fortnights", 60 * 60 * 24 * 14},
	{"month",      "months",     60 * 60 * 24 * 7 * 4},
	{"year",       "years",      60 * 60 * 24 * 365},
	/* ok-- we now do sizes here too. they aren't times, but
	   it's close enough */
	{"byte",	"bytes",	1},
	{"kb",		NULL,		1024},
	{"kbyte",	"kbytes",	1024},
	{"kilobyte",	"kilebytes",	1024},
	{"mb",		NULL,		1024 * 1024},
	{"mbyte",	"mbytes",	1024 * 1024},
	{"megabyte",	"megabytes",	1024 * 1024},
	{NULL, NULL, 0},
};

time_t conf_find_time(char *name)
{
  int i;

  for (i = 0; ircd_times[i].name; i++)
    {
      if (strcasecmp(ircd_times[i].name, name) == 0 ||
	  (ircd_times[i].plural && strcasecmp(ircd_times[i].plural, name) == 0))
	return ircd_times[i].val;
    }

  return 0;
}

static struct
{
	const char *word;
	int yesno;
} yesno[] = {
	{"yes",		1},
	{"no",		0},
	{"true",	1},
	{"false",	0},
	{"on",		1},
	{"off",		0},
	{NULL,		0}
};

static int	conf_get_yesno_value(char *str)
{
	int i;

	for (i = 0; yesno[i].word; i++)
	{
		if (strcasecmp(str, yesno[i].word) == 0)
		{
			return yesno[i].yesno;
		}
	}

	return -1;
}

static void	free_cur_list(conf_parm_t* list)
{
	if (list->type == CF_STRING || list->type == CF_QSTRING) {
	        rb_free(list->v.string);
	} else if (list->type == CF_FLIST) {
		/* Even though CF_FLIST is a flag, comparing with == is valid
		 * because conf_parm_t.type must be either a type or one flag.
		 */
		free_cur_list(list->v.list);
	}

	if (list->next) {
		free_cur_list(list->next);
	}

	rb_free(list);
}


conf_parm_t *	cur_list = NULL;

static void	add_cur_list_cpt(conf_parm_t *new)
{
	if (cur_list == NULL)
	{
		cur_list = rb_malloc(sizeof(conf_parm_t));
		cur_list->type = CF_FLIST;
		cur_list->v.list = new;
	}
	else
	{
		new->next = cur_list->v.list;
		cur_list->v.list = new;
	}
}

static void	add_cur_list(int type, char *str, int number)
{
	conf_parm_t *new;

	new = rb_malloc(sizeof(conf_parm_t));
	new->next = NULL;
	new->type = type;

	switch(type)
	{
	case CF_INT:
	case CF_TIME:
	case CF_YESNO:
		new->v.number = number;
		break;
	case CF_STRING:
	case CF_QSTRING:
		new->v.string = rb_strdup(str);
		break;
	}

	add_cur_list_cpt(new);
}


%}

%union {
	int		number;
	char		string[IRCD_BUFSIZE + 1];
	conf_parm_t *	conf_parm;
}

%token LOADMODULE TWODOTS

%token <string> QSTRING STRING
%token <number> NUMBER

%type <string> qstring string
%type <number> number timespec
%type <conf_parm> oneitem single itemlist

%start conf

%%

conf:
	| conf conf_item
	| error
	;

conf_item: block
	 | loadmodule
         ;

block: string
         {
           conf_start_block($1, NULL);
         }
       '{' block_items '}' ';'
         {
	   if (conf_cur_block)
	           conf_end_block(conf_cur_block);
         }
     | string qstring
         {
           conf_start_block($1, $2);
         }
       '{' block_items '}' ';'
         {
	   if (conf_cur_block)
	           conf_end_block(conf_cur_block);
         }
     ;

block_items: block_items block_item
           | block_item
           ;

block_item:	string '=' itemlist ';'
		{
			conf_call_set(conf_cur_block, $1, cur_list);
			free_cur_list(cur_list);
			cur_list = NULL;
		}
		;

itemlist: itemlist ',' single
	| single
	;

single: oneitem
	{
		add_cur_list_cpt($1);
	}
	| oneitem TWODOTS oneitem
	{
		/* "1 .. 5" meaning 1,2,3,4,5 - only valid for integers */
		if ($1->type != CF_INT || $3->type != CF_INT)
		{
			conf_report_error("Both arguments in '..' notation must be integers.");
			break;
		}
		else
		{
			int i;

			for (i = $1->v.number; i <= $3->v.number; i++)
			{
				add_cur_list(CF_INT, 0, i);
			}
		}
	}
	;

oneitem: qstring
            {
		$$ = rb_malloc(sizeof(conf_parm_t));
		$$->type = CF_QSTRING;
		$$->v.string = rb_strdup($1);
	    }
          | timespec
            {
		$$ = rb_malloc(sizeof(conf_parm_t));
		$$->type = CF_TIME;
		$$->v.number = $1;
	    }
          | number
            {
		$$ = rb_malloc(sizeof(conf_parm_t));
		$$->type = CF_INT;
		$$->v.number = $1;
	    }
          | string
            {
		/* a 'string' could also be a yes/no value ..
		   so pass it as that, if so */
		int val = conf_get_yesno_value($1);

		$$ = rb_malloc(sizeof(conf_parm_t));

		if (val != -1)
		{
			$$->type = CF_YESNO;
			$$->v.number = val;
		}
		else
		{
			$$->type = CF_STRING;
			$$->v.string = rb_strdup($1);
		}
            }
          ;

loadmodule:
	  LOADMODULE QSTRING
            {
              char *m_bn;

              m_bn = rb_basename((char *) $2);

              if (findmodule_byname(m_bn) == -1)
	          load_one_module($2, 0);

              rb_free(m_bn);
	    }
	  ';'
          ;

qstring: QSTRING { strcpy($$, $1); } ;
string: STRING { strcpy($$, $1); } ;
number: NUMBER { $$ = $1; } ;

timespec:	number string
		{
			time_t t;

			if ((t = conf_find_time($2)) == 0)
			{
				conf_report_error("Unrecognised time type/size '%s'", $2);
				t = 1;
			}

			$$ = $1 * t;
		}
		| timespec timespec
		{
			$$ = $1 + $2;
		}
		| timespec number
		{
			$$ = $1 + $2;
		}
		;