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: / usr / share / doc / bison / examples / c / mfcalc /
Filename : calc.h
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/* Functions for mfcalc.   -*- C -*-

   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
   Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

   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 3 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, see <https://www.gnu.org/licenses/>.  */

/* Function type. */
typedef double (func_t) (double);

/* Data type for links in the chain of symbols. */
struct symrec
{
  char *name;  /* name of symbol */
  int type;    /* type of symbol: either VAR or FUN */
  union
  {
    double var;    /* value of a VAR */
    func_t *fun;   /* value of a FUN */
  } value;
  struct symrec *next;  /* link field */
};

typedef struct symrec symrec;

/* The symbol table: a chain of 'struct symrec'. */
extern symrec *sym_table;

symrec *putsym (char const *name, int sym_type);
symrec *getsym (char const *name);