null.c

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    /*+-----------------------------------------------------------------**
     **                       OpenScop Library                          **
     **-----------------------------------------------------------------**
     **                       extensions/null.c                         **
     **-----------------------------------------------------------------**
     **                   First version: 28/06/2012                     **
     **-----------------------------------------------------------------**

 
 *****************************************************************************
 * OpenScop: Structures and formats for polyhedral tools to talk together    *
 *****************************************************************************
 *    ,___,,_,__,,__,,__,,__,,_,__,,_,__,,__,,___,_,__,,_,__,                *
 *    /   / /  //  //  //  // /   / /  //  //   / /  // /  /|,_,             *
 *   /   / /  //  //  //  // /   / /  //  //   / /  // /  / / /\             *
 *  |~~~|~|~~~|~~~|~~~|~~~|~|~~~|~|~~~|~~~|~~~|~|~~~|~|~~~|/_/  \            *
 *  | G |C| P | = | L | P |=| = |C| = | = | = |=| = |=| C |\  \ /\           *
 *  | R |l| o | = | e | l |=| = |a| = | = | = |=| = |=| L | \# \ /\          *
 *  | A |a| l | = | t | u |=| = |n| = | = | = |=| = |=| o | |\# \  \         *
 *  | P |n| l | = | s | t |=| = |d| = | = | = | |   |=| o | | \# \  \        *
 *  | H | | y |   | e | o | | = |l|   |   | = | |   | | G | |  \  \  \       *
 *  | I | |   |   | e |   | |   | |   |   |   | |   | |   | |   \  \  \      *
 *  | T | |   |   |   |   | |   | |   |   |   | |   | |   | |    \  \  \     *
 *  | E | |   |   |   |   | |   | |   |   |   | |   | |   | |     \  \  \    *
 *  | * |*| * | * | * | * |*| * |*| * | * | * |*| * |*| * | /      \* \  \   *
 *  | O |p| e | n | S | c |o| p |-| L | i | b |r| a |r| y |/        \  \ /   *
 *  '---'-'---'---'---'---'-'---'-'---'---'---'-'---'-'---'          '--'    *
 *                                                                           *
 * Copyright (C) 2008 University Paris-Sud 11 and INRIA                      *
 *                                                                           *
 * (3-clause BSD license)                                                    *
 * 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.   *
 * 3. The name of the author may not be used to endorse or promote products  *
 *    derived from this software without specific prior written permission.  *
 *                                                                           *
 * 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.         *
 *                                                                           *
 * OpenScop Library, a library to manipulate OpenScop formats and data       *
 * structures. Written by:                                                   *
 * Cedric Bastoul     <Cedric.Bastoul@u-psud.fr> and                         *
 * Louis-Noel Pouchet <Louis-Noel.pouchet@inria.fr>                          *
 *                                                                           *
 *****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <osl/macros.h>
#include <osl/util.h>
#include <osl/interface.h>
#include <osl/extensions/null.h>


/*+***************************************************************************
 *                          Structure display function                       *
 *****************************************************************************/


void osl_null_idump(FILE * file, osl_null_p null, int level) {
  int j;

  // Go to the right level.
  for (j = 0; j < level; j++)
    fprintf(file, "|\t");

  if (null != NULL)
    fprintf(file, "+-- osl_null_t\n");
  else
    fprintf(file, "+-- NULL null\n");

  // The last line.
  for (j = 0; j <= level; j++)
    fprintf(file, "|\t");
  fprintf(file, "\n");
}


void osl_null_dump(FILE * file, osl_null_p null) {
  osl_null_idump(file, null, 0);
}


char * osl_null_sprint(osl_null_p null) {
  char * string = NULL;

  if (null != NULL) {
    // Print nothing.
    OSL_malloc(string, char *, sizeof(char));
    string[0] = '\0';
  }

  return string;
}


/*****************************************************************************
 *                               Reading function                            *
 *****************************************************************************/


osl_null_p osl_null_sread(char ** input) {
  osl_null_p null;

  if (*input == NULL) {
    OSL_debug("no null optional tag");
    return NULL;
  }

  // Build the null structure
  null = osl_null_malloc();

  // Update the input pointer (everything has been read and ignored).
  input += strlen(*input);

  return null;
}


/*+***************************************************************************
 *                    Memory allocation/deallocation function                *
 *****************************************************************************/


osl_null_p osl_null_malloc() {
  osl_null_p null;

  OSL_malloc(null, osl_null_p, sizeof(osl_null_t));
  return null;
}


void osl_null_free(osl_null_p null) {
  if (null != NULL) {
    free(null);
  }
}


/*+***************************************************************************
 *                            Processing functions                           *
 *****************************************************************************/


osl_null_p osl_null_clone(osl_null_p null) {
  osl_null_p clone;

  if (null == NULL)
    return NULL;

  clone = osl_null_malloc();
  return clone;
}


int osl_null_equal(osl_null_p c1, osl_null_p c2) {
  if (c1 == c2)
    return 1;

  if (((c1 == NULL) && (c2 != NULL)) || ((c1 != NULL) && (c2 == NULL))) {
    OSL_info("nulls are not the same");
    return 0;
  }

  return 1;
}


osl_interface_p osl_null_interface() {
  osl_interface_p interface = osl_interface_malloc();
  
  OSL_strdup(interface->URI, OSL_URI_NULL);
  interface->idump  = (osl_idump_f)osl_null_idump;
  interface->sprint = (osl_sprint_f)osl_null_sprint;
  interface->sread  = (osl_sread_f)osl_null_sread;
  interface->malloc = (osl_malloc_f)osl_null_malloc;
  interface->free   = (osl_free_f)osl_null_free;
  interface->clone  = (osl_clone_f)osl_null_clone;
  interface->equal  = (osl_equal_f)osl_null_equal;

  return interface;
}