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+$! 28 December 2006. SMS.
+$!
+$! Info-ZIP VMS accessory procedure.
+$!
+$! Find the BZIP2 object library under P1, starting in the [.'P2']
+$! destination directory. (We assume, initially, that the BZIP2
+$! directory has a destination directory structure like ours.)
+$!
+$! Set the P4 logical name to the directory where it was found.
+$! P5 and P6 may be used for qualifiers on the DEFINE command.
+$!
+$ bz_orig = p1
+$ dest = p2
+$ libbz2 = p3
+$!
+$! Remove any trailing colon, to allow logical name translation.
+$!
+$ bz_dev_dir = ""
+$ bz_base = bz_orig
+$ if (f$extract( (f$length( bz_base)- 1), 1, bz_base) .eqs. ":")
+$ then
+$ bz_base = bz_base- ":"
+$ endif
+$!
+$ bz_base_eqv = f$trnlnm( bz_base)
+$ if (bz_base_eqv .nes. "")
+$ then
+$ bz_orig = bz_base_eqv
+$ bz_base = bz_base_eqv
+$ endif
+$ bz_base = bz_base- "]"
+$!
+$! Candidate 1 = the actual analogue destination directory.
+$!
+$ bz_dev_dir_cand = bz_base+ "."+ dest+ "]"
+$ lib_cand = bz_dev_dir_cand+ libbz2
+$ if (f$search( lib_cand) .nes. "")
+$ then
+$ bz_dev_dir = bz_dev_dir_cand
+$ else
+$!
+$! Candidate 2 = the actual analogue destination directory + "L".
+$!
+$ bz_dev_dir_cand = bz_base+ "."+ dest+ "L]"
+$ lib_cand = bz_dev_dir_cand+ libbz2
+$ if (f$search( lib_cand) .nes. "")
+$ then
+$ bz_dev_dir = bz_dev_dir_cand
+$ else
+$!
+$! Candidate 3 = the actual user-specified directory.
+$!
+$ bz_dev_dir_cand = bz_orig
+$ lib_cand = bz_dev_dir_cand+ libbz2
+$ if (f$search( lib_cand) .nes. "")
+$ then
+$ bz_dev_dir = bz_dev_dir_cand
+$ endif
+$ endif
+$ endif
+$!
+$ if (bz_dev_dir .nes. "")
+$ then
+$ if (p4 .eqs. "")
+$ then
+$ write sys$output bz_dev_dir
+$ else
+$ define 'p5' 'p4' 'bz_dev_dir' 'p6'
+$ endif
+$ endif
+$!