1 files changed, 33 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftmkyl.f b/pkg/tbtables/fitsio/ftmkyl.f
new file mode 100644
index 00000000..e7395b90
--- /dev/null
+++ b/pkg/tbtables/fitsio/ftmkyl.f
@@ -0,0 +1,33 @@
+C--------------------------------------------------------------------------
+        subroutine ftmkyl(ounit,keywrd,logval,comm,status)
+
+C       modify a logical value header record 
+C
+C       ounit   i  fortran output unit number
+C       keywrd  c  keyword name    ( 8 characters, cols.  1- 8)
+C       logval  l  keyword value 
+C       comm    c  keyword comment (47 characters, cols. 34-80)
+C       OUTPUT PARAMETERS:
+C       status  i  output error status (0 = ok)
+C
+C       written by Wm Pence, HEASARC/GSFC, June 1991
+
+        character*(*) keywrd,comm
+        integer ounit,status
+        logical logval
+        character value*20,cmnt*48
+
+C       find the old keyword
+        call ftgkey(ounit,keywrd,value,cmnt,status)
+        
+C       check for special symbol indicating that comment should not be changed
+        if (comm .ne. '&')then
+              cmnt=comm
+        end if
+
+C       convert logical to character string
+        call ftl2c(logval,value,status)
+
+C       modify the keyword record
+        call ftmkey(ounit,keywrd,value,cmnt,status)
+        end