chain< string > * csdbg::util::getenv ( const i8 *  var )

static

Parse a shell (environment) variable to its components.

Parameters

[in]

var

the variable name

Returns

the variable components, tokenized with ':' (heap allocated)

Exceptions

std::bad_alloc
csdbg::exception

Definition at line 128 of file util.cpp.

References __D_ASSERT, csdbg::chain< T >::add(), csdbg::string::append(), csdbg::string::length(), likely, and unlikely.

Referenced by csdbg::tracer::on_lib_load().

{
  __D_ASSERT(var != NULL);
  if ( unlikely(var == NULL) )
    return NULL;

  const i8 *val = ::getenv(var);
  if ( unlikely(val == NULL) )
    return NULL;

  chain<string> *retval = new chain<string>;
  string *token = NULL;

  try {
    token = new string;

    /* Token parsing */
    for (u32 i = 0, sz = strlen(val); likely(i < sz); i++) {
      i8 ch = val[i];

      if ( likely(ch != ':') )
        token->append(ch);

      /* New token */
      else if ( likely(token->length() > 0) ) {
        retval->add(token);
        token = NULL;
        token = new string;
      }
    }

    /* Final token */
    if ( likely(token->length() > 0) )
      retval->add(token);
    else
      delete token;

    return retval;
  }

  catch (...) {
    delete retval;
    delete token;
    throw;
  }
}

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