/*

   Licensed to the Apache Software Foundation (ASF) under one or more

   contributor license agreements.  See the NOTICE file distributed with

   this work for additional information regarding copyright ownership.

   The ASF licenses this file to You under the Apache License, Version 2.0

   (the "License"); you may not use this file except in compliance with

   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software

   distributed under the License is distributed on an "AS IS" BASIS,

   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

   See the License for the specific language governing permissions and

   limitations under the License.

SET environment variables

First optional parameter:

   ;     parameters are considered parts of a path variable, semicolons are

         appended to each element if not already present

   -D    parameters are properties for Java or Makefile etc., -D will be

         prepended and the parameters will be separated by a space

   =D    the same as above but equal sign is not required

   ,     parameters should be comma separated in the environment variable

   -     parameters should be separated by the next parameter

   Other values mean that the first parameter is missing and the environment

   variable will be set to the space separated parameters

Second parameter: name of the environment variable

Next parameters: values

; implies that the equal sign is considered a part of the parameter and is

not interpreted

-D requires parameters in the form name=value. If the equal sign is not found,

the parameters are changed to name=expanded_name

Other options have optional equal sign. If it is found, only the part after

the equal sign will be oprionally expanded.

If the parameter is the minus sign, the next parameter will not be expanded.

If the parameter is a single dot, it will be replaced with the value of the

environment variable as it existed before envset was invoked.

For other parameters the batch looks for the environment variable with the

same name (in uppercase). If it is found, it forms the expanded_name. If

the environment variable with such a name does not exist, the expanded_name

will hold the parameter name without case conversion.

*/

parse arg mode envar args

equal = 0

sep = ' '

/* Parse command line parameters */

select

  when mode='-' then do

    sep = envar

    parse var args envar args

  end

  when mode=';' then do

    sep = ''

    equal = -1

  end

  when mode='-D' then equal = 1

  when mode='=D' then mode = '-D'

  when mode=',' then sep = ','

otherwise

  args = envar args

  envar = mode

  mode = ''

end

env = 'OS2ENVIRONMENT'

envar = translate(envar)

orig = value(envar,,env)

newval = ''

expand = 1

/* for each parameter... */

do i = 1 to words(args)

  if expand > 0 & word(args, i) = '-' then expand = 0

  else call addval word(args, i)

end

/* Optionally enclose path variable by quotes */

if mode = ';' & pos(' ', newval) > 0 then newval = '"' || newval || '"'

/* Set the new value, 'SET' cannot be used since it does not allow '=' */

x = value(envar, newval, env)

exit 0

addval: procedure expose sep equal orig expand newval mode env

parse arg var

if var = '.' then expvar = orig

else do

  if equal >= 0 then do

    parse var var name '=' val

    if val = '' then var = name

    else var = val

  end

  if expand = 0 then expvar = var

  else expvar = value(translate(var),,env)

  if expvar = '' then expvar = var

  if equal >= 0 then do

    if val = '' then do

      parse var expvar key '=' val

      if val <> '' then name = key

      else do

        if equal > 0 then val = key

        else name = key

      end

    end

    else val = expvar

    if pos(' ', val) > 0 | pos('=', val) > 0 then val = '"' || val || '"'

    if val = '' then expvar = name

    else expvar = name || '=' || val

  end

  if mode = '-D' then expvar = '-D' || expvar

  if mode = ';' then do

    if right(expvar, 1) <> ';' then expvar = expvar || ';'

  end

end

if newval = '' then newval = expvar

else newval = newval || sep || expvar

expand = 1

return