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unitAndId.c

/*
 * Copyright 2008, 2009 University Corporation for Atmospheric Research
 *
 * This file is part of the UDUNITS-2 package.  See the file LICENSE
 * in the top-level source-directory of the package for copying and
 * redistribution conditions.
 */
/*
 * Searchable unit-and-identifier tree.
 */

/*LINTLIBRARY*/

#ifndef     _XOPEN_SOURCE
#   define _XOPEN_SOURCE 500
#endif

#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "unitAndId.h"
#include "udunits2.h"


/*
 * Arguments:
 *    unit  The unit.  May be freed upon return.
 *    id    The identifier (name or symbol).  May be freed upon return.
 * Returns:
 *    NULL  Failure.  "ut_get_status()" will be
 *              UT_BAD_ARG    "unit" or "id" is NULL.
 *              UT_OS   Operating-system failure.  See "errno".
 *    else  Pointer to the new unit-and-identifier.
 */
UnitAndId*
uaiNew(
    const ut_unit* const      unit,
    const char* const           id)
{
    UnitAndId*    entry = NULL;           /* failure */

    if (id == NULL || unit == NULL) {
      ut_set_status(UT_BAD_ARG);
      ut_handle_error_message("uaiNew(): NULL argument");
    }
    else {
      entry = malloc(sizeof(UnitAndId));

      if (entry == NULL) {
          ut_set_status(UT_OS);
          ut_handle_error_message(strerror(errno));
          ut_handle_error_message("Couldn't allocate %lu-byte data-structure",
            sizeof(UnitAndId));
      }
      else {
          entry->id = strdup(id);

          if (entry->id == NULL) {
            ut_set_status(UT_OS);
            ut_handle_error_message(strerror(errno));
            ut_handle_error_message("Couldn't duplicate identifier");
          }
          else {
            entry->unit = ut_clone(unit);

            if (entry->unit == NULL) {
                assert(ut_get_status() != UT_SUCCESS);
                free(entry->id);
            }
          }

          if (ut_get_status() != UT_SUCCESS) {
            free(entry);
            entry = NULL;
          }
      }
    }

    return entry;
}


/*
 * Frees memory of a unit-and-identifier.
 *
 * Arguments:
 *    entry Pointer to the unit-and-identifier or NULL.
 */
void
uaiFree(
    UnitAndId* const    entry)
{
    if (entry != NULL) {
      free(entry->id);
      ut_free(entry->unit);
      free(entry);
    }
}

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