kc3-lang/kc3/libkc3/var.c

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• Hash : f9ee7637
  Author : Thomas de Grivel
  Date : 2024-07-28T05:02:34
  

  initialize tmp

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• libkc3/var.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 "data.h"
  #include "sym.h"
  #include "tag.h"
  #include "var.h"
  
  s_var * var_init (s_var *var, const s_sym *type)
  {
    assert(var);
    assert(type);
    if (! sym_is_module(type)) {
      err_write_1("var_init: invalid type: ");
      err_inspect_sym(&type);
      err_write_1("\n");
      assert(! "var_init: invalid type");
      return NULL;
    }
    var->type = type;
    return var;
  }
  
  s_tag * var_init_cast (s_tag *tag, const s_sym * const *type,
                         const s_tag *src)
  {
    void *data;
    s_tag tmp = {0};
    assert(tag);
    assert(type);
    assert(src);
    if (*type == &g_sym_Var) {
      err_puts("var_init_cast: cannot cast to Var");
      assert(! "var_init_cast: cannot cast to Var");
      return NULL;
    }
    if (! sym_to_tag_type(*type, &tmp.type))
      return NULL;
    if (! tag_to_pointer(&tmp, *type, &data))
      return NULL;
    if (! data_init_cast(data, type, src))
      return NULL;
    *tag = tmp;
    return tag;
  }
  
  s_tag * var_init_copy (s_tag *tag, const s_tag *src)
  {
    assert(tag);
    assert(src);
    assert(src->type == TAG_VAR);
    if (src->type != TAG_VAR)
      return NULL;
    tag->type = TAG_VAR;
    tag->data.var = src->data.var;
    return tag;
  }
  
  s_tag * var_set (s_tag *var, const s_tag *value)
  {
    const s_sym *value_type;
    const s_sym *var_type;
    assert(var);
    assert(value);
    if (var->type != TAG_VAR) {
      err_puts("var_set: not a TAG_VAR");
      assert(! "var_set: not a TAG_VAR");
      return NULL;
    }
    var_type = var->data.var.type;
    if (var_type != &g_sym_Tag) {
      if (! tag_type(value, &value_type))
        return NULL;
      if (var_type != value_type) {
        err_write_1("var_set: type mismatch: ");
        err_inspect_sym(&var_type);
        err_write_1(" != ");
        err_inspect_sym(&value_type);
        err_write_1("\n");
        assert(! "var_set: type mismatch");
        return NULL;
      }
    }
    return tag_init_copy(var, value);
  }
  

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