#include <stdio.h>#include <stdlib.h>#include <string.h>#include "yaccdef.h"yyerror(s)char *s;{    yymessage ("Error", s, NULL);}yywarning(s, token)char *s, *token;{    yymessage ("Warning", s, token);}yymessage(error, s, token)char *error, *s, *token;{    fflush (stdout);    if (s == NULL) fprintf (stderr, "\nFatal syntax error in line %d\n", line);    else if (token == NULL) {      if (line) fprintf(stderr, "%s: %s in line %d\n", error, s, line);      else fprintf (stderr, "%s: %s", error, s);    }    else {      if (line == 0) fprintf(stderr, "%s: %s \'%s\'\n", error, s, token);      else fprintf(stderr, "%s: %s \'%s\' in line %d\n", error, s, token, line);    }    if (error[0] == 'E') exit (1);}