isCOBOL Evolve : Appendices : Library Routines : CBL_JOIN_FILENAME
CBL_JOIN_FILENAME
The CBL_JOIN_FILENAME library routine forms a filename by joining together its component parts; that is, the pathname, basename and extension.
Syntax:
 CALL "CBL_JOIN_FILENAME" USING cbltSplitjoinBuf
                                joinBuffer
                                pathBuffer
                                basenameBuffer
                                extensionBuffer
                         GIVING returnCode
Parameters:
cbltSplitjoinBuf
Group Item
Group item defined as follows:
 
01 cblt-splitjoin-buf.
   03 param-length pic x(2) comp-x.
   03 split-join-flag1 pic x comp-x.
   03 split-join-flag2 pic x comp-x.
   03 device-offset pic x(2) comp-x.
   03 device-length pic x(2) comp-x.
   03 basename-offset pic x(2) comp-x.
   03 basename-length pic x(2) comp-x.
   03 extension-offset pic x(2) comp-x.
   03 extension-length pic x(2) comp-x.
   03 total-length pic x(2) comp-x.
   03 split-buf-len pic x(2) comp-x.
   03 join-buf-len pic x(2) comp-x.
   03 first-component-length pic x(2) comp-x.
 
On entry:
param-length is the length of the structure in bytes. It should be set to 24.
splitjoin-flg1’s bit 1 says that the strings are null-terminated if set to 1, while they are space-terminated if set to 0.
splitjoin-flg1’s bit 2 says that the filename is folded to upper case if set to 1, while the original case is preserved if set to 0.
split-buf-len specifies the length in bytes of joinBuffer.
splitjoin-flg2’s bit 2 is set if there is a significant space in the filename.
splitjoin-flg2’s bit 1 is set if there is a wildcard in the path.
splitjoin-flg2’s bit 0 is set if there is a wildcard in basename or extension.
device-offset specifies the start of pathname in joinBuffer, from one.
device-length specifies the length of the pathname.
basename-offset specifies the start of basename in joinBuffer, from one.
basename-length specifies the length of the basename.
extension-offset specifies the start of extension in joinBuffer, from one.
extension-length specifies the length of the extension.
first-component-length specifies the number of characters up to and including the first backslash or slash or colon in joinBuffer.
 
On exit:
total-length specifies the total number of characters in joinBuffer.
joinBuffer
PIC X(n)
Specifies the area to store the joined file name.
pathBuffer
PIC X(n)
Specifies the pathname.
basenameBuffer
PIC X(n)
Specifies the basename.
extensionBufffer
PIC X(n)
Specifies the extension.
Return code:
returnCode can be any numeric data item and provides additional information:
0
Operation successful.
1
Buffer overflow.
4
File name is invalid.
Examples:
Example - Build the file name “C:\Temp\myfile.txt”.
  WORKING-STORAGE SECTION.
  77  fi-base-name            pic x(30) value "myfile".
  77  fi-extension            pic x(10) value "txt".
  77  fi-path                 pic x(256) value "C:\Temp".
  01  join-buffer             pic x(256).
     
   PROCEDURE DIVISION.
   MAIN. 
        move 1 to device-offset
                  basename-offset
                  extension-offset
      
        move length of fi-path      to device-length
        move length of fi-base-name to basename-length
        move length of fi-extension to extension-length
        move length of join-buffer  to join-buf-len
 
        move 0 to split-join-flag1
        move 24 to param-length
      
        call "CBL_JOIN_FILENAME" using cblt-splitjoin-buf
                                       join-buffer
                                       fi-path
                                       fi-base-name
                                       fi-extension