/*
    Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
  tre-stack.h: Stack definitions

This is the license, copyright notice, and disclaimer for TRE, a regex
matching package (library and tools) with support for approximate
matching.

Copyright (c) 2001-2009 Ville Laurikari <vl@iki.fi>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#ifndef _HAWK_TRE_STACK_H_
#define _HAWK_TRE_STACK_H_

#include "tre-prv.h"

typedef struct tre_stack_rec tre_stack_t;

/* Creates a new stack object.	`size' is initial size in bytes, `max_size'
   is maximum size, and `increment' specifies how much more space will be
   allocated with realloc() if all space gets used up.	Returns the stack
   object or NULL if out of memory. */
tre_stack_t *
tre_stack_new(hawk_gem_t* gem, int size, int max_size, int increment);

/* Frees the stack object. */
void
tre_stack_destroy(tre_stack_t *s);

/* Returns the current number of objects in the stack. */
int
tre_stack_num_objects(tre_stack_t *s);

/* Each tre_stack_push_*(tre_stack_t *s, <type> value) function pushes
   `value' on top of stack `s'.  Returns REG_ESPACE if out of memory.
   This tries to realloc() more space before failing if maximum size
   has not yet been reached.  Returns REG_OK if successful. */
#define declare_pushf(typetag, type)					      \
  reg_errcode_t tre_stack_push_ ## typetag(tre_stack_t *s, type value)

declare_pushf(voidptr, void *);
declare_pushf(int, int);

/* Each tre_stack_pop_*(tre_stack_t *s) function pops the topmost
   element off of stack `s' and returns it.  The stack must not be
   empty. */
#define declare_popf(typetag, type)		  \
  type tre_stack_pop_ ## typetag(tre_stack_t *s)

declare_popf(voidptr, void *);
declare_popf(int, int);

/* Just to save some typing. */
#define STACK_PUSH(s, typetag, value)					      \
  do									      \
    {									      \
      status = tre_stack_push_ ## typetag(s, value);			      \
    }									      \
  while (/*CONSTCOND*/0)

#define STACK_PUSHX(s, typetag, value)					      \
  {									      \
    status = tre_stack_push_ ## typetag(s, value);			      \
    if (status != REG_OK)						      \
      break;								      \
  }

#define STACK_PUSHR(s, typetag, value)					      \
  {									      \
    reg_errcode_t _status;						      \
    _status = tre_stack_push_ ## typetag(s, value);			      \
    if (_status != REG_OK)						      \
      return _status;							      \
  }

#endif /* TRE_STACK_H */

/* EOF */