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1 files changed, 39 insertions, 0 deletions

diff --git a/sys/osb/strupk.f b/sys/osb/strupk.f
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+c STRUPK -- Unpack a kernel (C style) string into an SPP string.  The unpacking
+c operation can be performed in place.  A kernel string consists of a sequence
+c of host characters stored one character per byte, delimited by EOS='\0'.
+c We assume here that the host character set is ASCII.  If this is not the
+c case code must be added to convert from the host character set to ASCII in
+c the unpacked string.
+c
+c N.B.: If sizeof(XCHAR)=1, XEOS=EOS, and the host character set is ASCII,
+c and the operation is being performed in place, then this procedure should
+c do nothing.
+c 
+c N.B.: This code ASSUMES that XCHAR is implemented as INTEGER*2 and that
+c both XEOS and EOS are 0.
+
+	subroutine strupk (instr, outstr, maxch)
+
+	character*1 instr(*)
+	integer*2 outstr(*)
+	integer maxch, EOS
+	parameter (EOS=0)
+	integer i
+
+		    
+c Determine length of string so that we can unpack it in the reverse
+c direction.
+		i = 1
+ 10		continue
+		if (ichar (instr(i)) .eq. EOS .or. i .gt. maxch) goto 20
+		    i = i + 1
+		    goto 10
+ 20		continue
+
+c Unpack the string from right to left.
+c
+		outstr(i) = EOS
+		do 30 i=i, 1, -1
+		    outstr(i) = ichar (instr(i))
+ 30		continue
+	end