REXX Tips & Tricks, Version 2.80


Inf-HTML [About][Toc][Index] 0.9b (c) 1995 Peter Childs


Search a file





 
/* routine(s) to search a file in the directories saved in an         */
/* environment variable (e.g. "PATH")                                 */
/* Note that this routine won't find hidden or system files.          */

                        /* example call                               */
  do forever
    say "Enter a filename ("""" to abort):"
    searchFile = strip( lineIn() )

    if searchFile = '' then
      leave

    say "Result of SearchDataFile(" || searchFile || ") is: "
    say "  """ || SearchDataFile( searchFile ) || """"
    say "Result of SearchProgram(" || searchFile || ") is: "
    say "  """ || SearchProgram( searchFile ) || """"
  end /* do forever */

exit 0

/* ------------------------------------------------------------------ */
/* function: Search a file in the current directory and in the        */
/*           directories saved in an environment variable             */
/*           (e.g. PATH, DPATH, ... )                                 */
/*                                                                    */
/* call:     SearchFile( fileName, varName {,environment})            */
/*                                                                    */
/* where:    fileName - name of the file to search                    */
/*           varName - name of the environment variable containing    */
/*                     the directories to search                      */
/*           environment - environment with the environment Variable  */
/*                         (Def.: OS2ENVIRONMENT)                     */
/*                                                                    */
/* returns:  full name of the file or "" if not found                 */
/*                                                                    */
SearchFile: PROCEDURE
  parse arg fileName , envVar, environment
  resultStr = ""

  if fileName <> "" & envVar <> "" then
  do
    if environment = '' then
      environment = "OS2ENVIRONMENT"

    searchDirs = ".;" || value( envVar, , environment )

    do forever
      parse var searchDirs curSearchDir ";" searchDirs

      curSearchDir = strip( curSearchDir )

      if curSearchDir = "" then
        iterate

      if right( curSearchDir, 1 ) <> "\" & ,
         right( curSearchDir, 1 ) <> ":" then
        curSearchDir = curSearchDir || "\"

      resultStr = stream( curSearchDir || fileName, "c", "QUERY EXISTS" )
      if resultStr <> "" then
        leave

      if SearchDirs = "" then
        leave

    end /* do forverver */
  end /* if fileName <> "" & ... */

RETURN resultStr

/* ------------------------------------------------------------------ */
/* function: Search a file in the current directory and in the        */
/*           directories saved in the environment variable PATH       */
/*                                                                    */
/* call:     SearchProgram( progName {,environment})                  */
/*                                                                    */
/* where:    progName - name of the program to search                 */
/*           environment - environment with the environment Variable  */
/*                         (Def.: OS2ENVIRONMENT)                     */
/*                                                                    */
/* returns:  full name of the program or "" if not found              */
/*                                                                    */
SearchProgram: PROCEDURE
  parse arg progName , environment
  resultStr = ""
  if progName <> "" then
    resultStr = SearchFile( progName, "PATH", environment )
RETURN resultStr

/* ------------------------------------------------------------------ */
/* function: Search a datafile in the current directory and in the    */
/*           directories saved in the environment variable DPATH      */
/*                                                                    */
/* call:     SearchProgram( datafileName {,environment})              */
/*                                                                    */
/* where:    datafileName - name of the datafile to search            */
/*           environment - environment with the environment Variable  */
/*                         (Def.: OS2ENVIRONMENT)                     */
/*                                                                    */
/* returns:  full name of the datafile or "" if not found             */
/*                                                                    */
SearchDataFile: PROCEDURE
  parse arg dataFileName , environment
  resultStr = ""
  if dataFileName <> "" then
    resultStr = SearchFile( datafileName, "DPATH", environment )
RETURN resultStr


  

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