external/bsd/atf/dist/tools/env.hpp

   1 //
   2 // Automated Testing Framework (atf)
   3 //
   4 // Copyright (c) 2007 The NetBSD Foundation, Inc.
   5 // All rights reserved.
   6 //
   7 // Redistribution and use in source and binary forms, with or without
   8 // modification, are permitted provided that the following conditions
   9 // are met:
  10 // 1. Redistributions of source code must retain the above copyright
  11 //    notice, this list of conditions and the following disclaimer.
  12 // 2. Redistributions in binary form must reproduce the above copyright
  13 //    notice, this list of conditions and the following disclaimer in the
  14 //    documentation and/or other materials provided with the distribution.
  15 //
  16 // THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17 // CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20 // IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23 // GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25 // IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27 // IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29
  30 #if !defined(TOOLS_ENV_HPP)
  31 #define TOOLS_ENV_HPP
  32
  33 #include <string>
  34
  35 namespace tools {
  36 namespace env {
  37
  38 // ------------------------------------------------------------------------
  39 // Free functions.
  40 // ------------------------------------------------------------------------
  41
  42 //!
  43 //! \brief Returns the value of an environment variable.
  44 //!
  45 //! Returns the value of the specified environment variable.  The variable
  46 //! must be defined.
  47 //!
  48 std::string get(const std::string&);
  49
  50 //!
  51 //! \brief Checks if the environment has a variable.
  52 //!
  53 //! Checks if the environment has a given variable.
  54 //!
  55 bool has(const std::string&);
  56
  57 //!
  58 //! \brief Sets an environment variable to a given value.
  59 //!
  60 //! Sets the specified environment variable to the given value.  Note that
  61 //! variables set to the empty string are different to undefined ones.
  62 //!
  63 //! Be aware that this alters the program's global status, which in general
  64 //! is a bad thing to do due to the side-effects it may have.  There are
  65 //! some legitimate usages for this function, though.
  66 //!
  67 void set(const std::string&, const std::string&);
  68
  69 //!
  70 //! \brief Unsets an environment variable.
  71 //!
  72 //! Unsets the specified environment variable  Note that undefined
  73 //! variables are different to those defined but set to an empty value.
  74 //!
  75 //! Be aware that this alters the program's global status, which in general
  76 //! is a bad thing to do due to the side-effects it may have.  There are
  77 //! some legitimate usages for this function, though.
  78 //!
  79 void unset(const std::string&);
  80
  81 } // namespace env
  82 } // namespace tools
  83
  84 #endif // !defined(TOOLS_ENV_HPP)