kc3-lang/kc3/libkc3/pcow.c

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• Hash : 5a7ad46d
  Author : Thomas de Grivel
  Date : 2024-11-16T22:02:40
  

  wip deconstify much for ref counting everything.

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• libkc3/pcow.c

• /* kc3
   * Copyright 2022,2023,2024 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include "assert.h"
  #include "cow.h"
  #include "pcow.h"
  #include "tag.h"
  
  s_tag * pcow_assign (s_cow **cow, s_tag *value, s_tag *dest)
  {
    assert(cow);
    assert(value);
    assert(dest);
    if (cow_ref(*cow) < 0)
      return NULL;
    if (! tag_init_copy(cow_read_write(*cow), value))
      return NULL;
    if (! cow_freeze(*cow)) {
      return NULL;
    }
    dest->type = TAG_COW;
    dest->data.cow = *cow;
    return dest;
  }
  
  void pcow_clean (s_cow **p)
  {
    assert(p);
    if (! cow_unref(*p))
      cow_delete(*p);
  }
  
  s_cow ** pcow_init (s_cow **p, const s_sym *type)
  {
    s_cow *tmp = NULL;
    assert(p);
    tmp = cow_new(type);
    if (! tmp)
      return NULL;
    *p = tmp;
    return p;
  }
  
  s_cow ** pcow_init_cast (s_cow **p, const s_sym * const *type,
                           s_tag *src)
  {
    s_cow *tmp = NULL;
    assert(p);
    assert(src);
    tmp = cow_new_cast(type, src);
    if (! tmp)
      return NULL;
    *p = tmp;
    return p;
  }
  
  s_cow ** pcow_init_copy (s_cow **p, s_cow **src)
  {
    assert(p);
    assert(src);
    if (! src || ! *src) {
      err_puts("pcow_init_copy: NULL src");
      assert(! "pcow_init_copy: NULL src");
      return NULL;
    }
    if (cow_ref(*src) < 0) {
      err_puts("pcow_init_copy: cow_ref");
      assert(! "pcow_init_copy: cow_ref");
      return NULL;
    }
    *p = *src;
    return p;
  }
  

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