yy_reduce_print: debug ouput cannot be redirected to a file.

[Sébastien Fricker]

Hi,
here is a small issue in the debug output,
Regards,
Sébastien Fricker

The code of yy_reduce_print is:
 static void
   yy_reduce_print (yyvsp, yylsp, yyrule)
        YYSTYPE *yyvsp;
        YYLTYPE *yylsp;
        int yyrule;
       {
          int yynrhs = yyr2[yyrule];
          int yyi;
          unsigned long int yylno = yyrline[yyrule];
          YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
                 yyrule - 1, yylno);
          /* The symbols being reduced.  */
          for (yyi = 0; yyi < yynrhs; yyi++)
            {
              fprintf (stderr, "   $%d = ", yyi + 1);
              yy_symbol_print (stderr, yyrhs[yyprhs[yyrule] + yyi],
                       &(yyvsp[(yyi + 1) - (yynrhs)])
                       , &(yylsp[(yyi + 1) - (yynrhs)])            );
              fprintf (stderr, "\n");
            }
         }

If the use decides to reimplement YYFPRINTF to print the debug output
into a log file (ex: #define YYFPRINTF(F,X...) fprintf(logfile,X)) then
this code is not working.

The solution would be to produce the following code (which is nothing
else than replacinf fprintf through YYFPRINTF):
 static void
   yy_reduce_print (yyvsp, yylsp, yyrule)
        YYSTYPE *yyvsp;
        YYLTYPE *yylsp;
        int yyrule;
       {
          int yynrhs = yyr2[yyrule];
          int yyi;
          unsigned long int yylno = yyrline[yyrule];
          YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
                 yyrule - 1, yylno);
          /* The symbols being reduced.  */
          for (yyi = 0; yyi < yynrhs; yyi++)
            {
              YYFPRINTF (stderr, "   $%d = ", yyi + 1);
              yy_symbol_print (stderr, yyrhs[yyprhs[yyrule] + yyi],
                       &(yyvsp[(yyi + 1) - (yynrhs)])
                       , &(yylsp[(yyi + 1) - (yynrhs)])            );
              YYFPRINTF (stderr, "\n");
            }
         }

-- 
Sébastien Fricker

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