elemental-ircd/src/ircd_lexer.l

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/* src/ircd_lexer.l
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: ircd_lexer.l 3540 2007-07-30 17:26:00Z jilles $
*/
%option case-insensitive
%option noyywrap
%option nounput
%{
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#define WE_ARE_MEMORY_C
#include "stdinc.h"
#include "ircd_defs.h"
#include "common.h"
#include "config.h"
#include "logger.h"
#include "s_conf.h"
#include "newconf.h"
#include "y.tab.h"
int yylex(void);
/* here to fixup gcc 3.3 errors */
int yyget_lineno(void);
FILE *yyget_in(void);
FILE *yyget_out(void);
int yyget_leng(void);
char *yyget_text(void);
void yyset_lineno(int line_number);
void yyset_in(FILE * in_str);
void yyset_out(FILE * out_str);
int yyget_debug(void);
void yyset_debug(int bdebug);
int yylex_destroy(void);
#define MAX_INCLUDE_DEPTH 10
YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr=0;
int lineno = 1;
void ccomment(void);
void cinclude(void);
void hashcomment(void);
int ieof(void);
int lineno_stack[MAX_INCLUDE_DEPTH];
char conffile_stack[MAX_INCLUDE_DEPTH][IRCD_BUFSIZE];
char conffilebuf[IRCD_BUFSIZE+1];
char *current_file = conffilebuf;
FILE *inc_fbfile_in[MAX_INCLUDE_DEPTH];
char linebuf[512];
#undef YY_INPUT
#define YY_FATAL_ERROR(msg) conf_yy_fatal_error(msg)
#define YY_INPUT(buf,result,max_size) \
if (!(result = conf_fgets(buf, max_size, conf_fbfile_in))) \
YY_FATAL_ERROR("input in flex scanner failed");
%}
ws [ \t]*
digit [0-9]
comment #.*
qstring \"[^\"\n]*[\"\n]
string [a-zA-Z_\~][a-zA-Z0-9_]*
include \.include{ws}(\<.*\>|\".*\")
%%
{include} { cinclude(); }
"/*" { ccomment(); }
\n.* { strcpy(linebuf, yytext+1); lineno++; yyless(1); }
{ws} ;
{comment} { hashcomment(); }
{digit}+ { yylval.number = atoi(yytext); return NUMBER; }
{qstring} {
if(yytext[yyleng-2] == '\\')
{
yyless(yyleng-1); /* return last quote */
yymore(); /* append next string */
}
else
{
strcpy(yylval.string, yytext + 1);
if(yylval.string[yyleng-2] != '"')
ilog(L_MAIN, "Unterminated character string");
else
{
int i,j;
yylval.string[yyleng-2] = '\0'; /* remove close
* quote
*/
for (j=i=0 ;yylval.string[i] != '\0'; i++,j++)
{
if (yylval.string[i] != '\\')
{
yylval.string[j] = yylval.string[i];
}
else
{
i++;
if (yylval.string[i] == '\0') /* XXX
* should not
* happen
*/
{
ilog(L_MAIN,
"Unterminated character string");
break;
}
yylval.string[j] = yylval.string[i];
}
}
yylval.string[j] = '\0';
return QSTRING;
}
}
}
loadmodule { return LOADMODULE; }
{string} {
strcpy(yylval.string, yytext);
yylval.string[yyleng] = '\0';
return STRING;
}
\.\. { return TWODOTS; }
. { return yytext[0]; }
<<EOF>> { if (ieof()) yyterminate(); }
%%
/* C-comment ignoring routine -kre*/
void ccomment()
{
int c;
/* log(L_NOTICE, "got comment"); */
while (1)
{
while ((c = input()) != '*' && c != EOF)
if (c == '\n') ++lineno;
if (c == '*')
{
while ((c = input()) == '*');
if (c == '/')
break;
if (c == '\n') ++lineno;
}
if (c == EOF)
{
YY_FATAL_ERROR("EOF in comment");
/* XXX hack alert this disables
* the stupid unused function warning
* gcc generates
*/
yy_fatal_error("EOF in comment");
break;
}
}
}
void cinclude(void)
{
char *c;
if ((c = strchr(yytext, '<')) == NULL)
*strchr(c = strchr(yytext, '"') + 1, '"') = 0;
else
*strchr(++c, '>') = 0;
/* do stacking and co. */
if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
conf_report_error("Includes nested too deep (max is %d)", MAX_INCLUDE_DEPTH);
else
{
FILE *tmp_fbfile_in;
tmp_fbfile_in = fopen(c, "r");
if (tmp_fbfile_in == NULL)
{
/* if its not found in PREFIX, look in ETCPATH */
char fnamebuf[IRCD_BUFSIZE];
snprintf(fnamebuf, sizeof(fnamebuf), "%s/%s", ETCPATH, c);
tmp_fbfile_in = fopen(fnamebuf, "r");
/* wasnt found there either.. error. */
if(tmp_fbfile_in == NULL)
{
conf_report_error("Include %s: %s.", c, strerror(errno));
return;
}
}
lineno_stack[include_stack_ptr] = lineno;
lineno = 1;
inc_fbfile_in[include_stack_ptr] = conf_fbfile_in;
strcpy(conffile_stack[include_stack_ptr], c);
current_file = conffile_stack[include_stack_ptr];
include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER;
conf_fbfile_in = tmp_fbfile_in;
yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
}
}
int ieof(void)
{
if (include_stack_ptr)
fclose(conf_fbfile_in);
if (--include_stack_ptr < 0)
{
/* We will now exit the lexer - restore init values if we get /rehash
* later and reenter lexer -kre */
include_stack_ptr = 0;
lineno = 1;
return 1;
}
/* switch buffer */
yy_delete_buffer(YY_CURRENT_BUFFER);
lineno = lineno_stack[include_stack_ptr];
conf_fbfile_in = inc_fbfile_in[include_stack_ptr];
if(include_stack_ptr)
current_file = conffile_stack[include_stack_ptr];
else
current_file = conffilebuf;
yy_switch_to_buffer(include_stack[include_stack_ptr]);
return 0;
}
/* #-comment style, look for #include */
#define INCLUDE "#include"
void hashcomment(void)
{
if (strlen(yytext) < sizeof(INCLUDE) - 1)
return;
if (!strncasecmp(yytext, INCLUDE, sizeof(INCLUDE) - 1))
yyerror("You probably meant '.include', skipping");
}