View source for Detecting the LIBPATH values

<PRE> 
/* sample REXX routine to get the values of LIBPATH, BEGINLIBPATH     */
/* and ENDLIBPATH                                                     */
/*                                                                    */
/* RXT'T v3.20: Changed code to get BEGINLIBPATH and ENDLIBPATH       */
/*              new code tested with WARP 4 US Fixpack #15            */
/*                                                                    */

  say "Detecting the values of LIBPATH, BEGINLIBPATH and ENDLIBPATH ..."

  BootDrive = "C:"
  thisRC = GetLibPath( bootDrive )

  select

    when thisRC = 0 then
    do
      say "  LIBPATH = " || LIBPATH
      say "  BEGINLIBPATH = " || BEGINLIBPATH
      say "  ENDLIBPATH = " || ENDLIBPATH
    end /* when */

    when thisRC = 2 then
    do
      say "  LIBPATH = "
      say "    -> File " || BootDrive || "\CONFIG.SYS not found!"
      say "  BEGINLIBPATH = " || BEGINLIBPATH
      say "  ENDLIBPATH = " || ENDLIBPATH
    end /* when */

    otherwise
    do
      say "Unexpected return code " || thisRC || "!"
    end /* otherwise */

  end /* select */

exit

/* ------------------------------------------------------------------ */
/* function: Get the value for LIBPATH, BEGINLIBPATH and ENDLIBPATH   */
/*                                                                    */
/* Usage:    GetLibPath bootDrive                                     */
/*                                                                    */
/* where:    bootDrive - boot drive (e.g. "C:")                       */
/*                                                                    */
/* returns:   0 - ok                                                  */
/*            2 - config.sys not found                                */
/*           -1 - parameter missing                                   */
/*           -2 - error reading the CONFIG.SYS                  v3.20 */
/*                                                                    */
/* output:   LIBPATH - value of LIBPATH entry or empty string         */
/*           BEGINLIBPATH - value of BEGINLIBPATH or empty string     */
/*           ENDLIBPATH - value of ENDLIBPATH or empty string         */
/*                                                                    */
GetLibPath: PROCEDURE expose LIBPATH BEGINLIBPATH ENDLIBPATH
  parse arg bootDrive .

                    /* init the return code                           */
  thisRC = 0

  LIBPATH = ''                                               /* v3.20 */
  BEGINLIBPATH = ''                                          /* v3.20 */
  ENDLIBPATH = ''                                            /* v3.20 */

                    /* check the parameter                            */
  if bootDrive <> "" then
  do
                    /* get the LIBPATH value                          */
    configSys = left( bootDrive,1 ) || ":\CONFIG.SYS"

    lineSeparator = "0D0A"x
    libpathStmt = lineSeparator || "LIBPATH="

    if stream( configSys, "c", "QUERY EXISTS" ) <> "" then
    do
      configSysLength = chars( configSys )
                                                             /* v3.20 */
      if stream( configSys, "c", "OPEN READ" ) = 'READY:' then
      do
        configSYS = CharIn( configSys, 1, configSysLength )
        call stream configSys, "c", "CLOSE"

        parse upper var ConfigSYS . (libPathStmt) LIBPATH (lineSeparator) .
        LIBPATH = strip( LIBPATH )
      end /* if */
      else
      do
                                                             /* v3.20 */
                              /* error opening the CONFIG.SYS         */
        thisRC = -2
      end /* else */
    end
    else
      thisRC = -1

                    /* get BEGINLIBPATH and ENDLIBPATH                */
    call GetDynamicLibPath

  end /* if bootDrive <> "" then */
  else
    thisRC = -1

RETURN thisRC

/* ------------------------------------------------------------------ */
/* function: Get the value for BEGINLIBPATH and ENDLIBPATH            */
/*                                                                    */
/* Usage:    GetDynamicLibPath                                        */
/*                                                                    */
/* where:    -                                                        */
/*                                                                    */
/* returns:   -                                                       */
/*                                                                    */
/* output:                                                            */
/*           BEGINLIBPATH - value of BEGINLIBPATH or empty string     */
/*           ENDLIBPATH - value of ENDLIBPATH or empty string         */
/*                                                                    */
GetDynamicLibPath: PROCEDURE expose BEGINLIBPATH ENDLIBPATH

                    /*                                                */

                    /* save the OS/2 environment                      */
  '@SETLOCAL'

                    /* copy the value of BEGINLIBPATH and ENDLIBPATH  */
                    /* into "normal" environment variables            */
  '@SET val1=%BEGINLIBPATH%'
  '@SET val2=%ENDLIBPATH%'

                    /* retrieve the "normal" env variables            */
  beginlibpath = value( 'val1',, 'OS2ENVIRONMENT' )
  endlibpath = value( 'val2',, 'OS2ENVIRONMENT' )

                    /* restore the OS/2 environment                   */
  '@ENDLOCAL'
return ''

/* ------------------------------------------------------------------ */
/* function: Get the value for BEGINLIBPATH and ENDLIBPATH            */
/*                                                                    */
/* Usage:    GetDynamicLibPath                                        */
/*                                                                    */
/* where:    -                                                        */
/*                                                                    */
/* returns:   -                                                       */
/*                                                                    */
/* output:                                                            */
/*           BEGINLIBPATH - value of BEGINLIBPATH or empty string     */
/*           ENDLIBPATH - value of ENDLIBPATH or empty string         */
/*                                                                    */
/* notes:    Use this method if the routine above does not work.      */
/*                                                                    */
/*                                                                    */
Old_GetDynamicLibPath: PROCEDURE expose BEGINLIBPATH ENDLIBPATH

                    /* get the value of BEGINLIBPATH and ENDLIBPATH   */
  '@SET BEGINLIBPATH 2>NUL | rxqueue'
  '@SET ENDLIBPATH 2>NUL | rxqueue'

  if queued() <> 0 then
  do
    parse pull BEGINLIBPATH
    if BEGINLIBPATH = "(null)" then
        BEGINLIBPATH = ""
  end /* if queued() <> 0 then */
  else
    BEGINLIBPATH = ""

  if queued() <> 0 then
  do
    parse pull ENDLIBPATH
    if ENDLIBPATH = "(null)" then
      ENDLIBPATH = ""
  end /* if queued() <> 0 then */
  else
    ENDLIBPATH = ""

return ''
</PRE>

[[Category:REXX Tips & Tricks]]