yyparse more than once

[Prabhu M.K]

Hi all

I am calling yyparse more than once like one below


#include <iostream.h>
#include <stdio.h>
extern void yyrestart(FILE *);
static int flag;
extern int yylex();
extern FILE * yyin;
extern int yyparse();
int paser();


int
parse()
{
 yyin= fopen("example","r");
 if(flag)
  flag = 0;
 else
  yyrestart(yyin);

 yyparse();
 fclose(yyin);
 return 0;
}
main()
{
 flag = 1;
 parse();

 parse();
}

I am using bison 1.25 and Flex for parser and scanner generator...
The first call is completed successfully where as the second call
failed...
The output is looking like below one...

--(end of buffer or a NUL) ----->(First call of yyparse)
--accepting rule at line 60 ("<?EML-VERSION 1.0?>")
--accepting rule at line 69 ("
<?ETT")
--accepting rule at line 59 (" ")

goes on......


--(end of buffer or a NUL)
yywrap called
--EOF (start condition 1)
                                                    ---> (First call is
finished)
--(end of buffer or a NUL)          ---->(Second call of yyparse)
--accepting rule at line 75 ("<")
Got an Error
!ERROR(<)
--accepting rule at line 74 ("?EML-VERSION 1.0?>")
Syntax error: parse error

Press any key to continue

Where am goin wrong

Advance Thanks

Prabhu M.K



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