diff options
Diffstat (limited to 'pkg/tbtables/fitsio/ftmkys.f')
| -rw-r--r-- | pkg/tbtables/fitsio/ftmkys.f | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftmkys.f b/pkg/tbtables/fitsio/ftmkys.f new file mode 100644 index 00000000..82b3ec1a --- /dev/null +++ b/pkg/tbtables/fitsio/ftmkys.f @@ -0,0 +1,121 @@ +C-------------------------------------------------------------------------- + subroutine ftmkys(ounit,keywrd,strval,comm,status) + +C modify a character string value header record +C +C ounit i fortran output unit number +C keywrd c keyword name ( 8 characters, cols. 1- 8) +C strval c 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 +C modifed 7/93 to support string keywords continued over multiple cards +C modified 9/94 to support the OGIP long string convention + + character*(*) keywrd,strval,comm + integer ounit,status + + integer clen,i,nvalue,ncomm + character keynam*8,value*70,cmnt*48,bslash + +C-------COMMON BLOCK DEFINITIONS:-------------------------------------------- + integer nb,ne + parameter (nb = 20) + parameter (ne = 200) + integer bufnum,chdu,hdutyp,maxhdu,hdstrt,hdend,nxthdr,dtstrt + integer nxtfld + logical wrmode + common/ft0001/bufnum(199),chdu(nb),hdutyp(nb),maxhdu(nb), + & wrmode(nb),hdstrt(nb,ne),hdend(nb),nxthdr(nb),dtstrt(nb),nxtfld +C-------END OF COMMON BLOCK DEFINITIONS----------------------------------- + + if (status .gt. 0)return + +C check if the new value is too long to fit in a single 'card image' + clen=len(strval) + if (clen .le. 68)go to 20 + + do 10 i=clen,69,-1 + if (strval(i:i) .ne. ' ')go to 100 +10 continue + +C now check that the old keyword is not continued over multiple cards +C read the (first line) of the existing keyword + +20 call ftgkey(ounit,keywrd,value,cmnt,status) + if (status .gt. 0)go to 900 + +C is last character of the value a backslash or & ? +C have to use 2 \\'s because the SUN compiler treats 1 \ as an escape + bslash='\\' + do 30 i=70,1,-1 + if (value(i:i) .ne. ' '.and. value(i:i).ne.'''')then + if (value(i:i) .eq. bslash .or. + & value(i:i) .eq. '&')then +C backspace the current header pointer by one record + nxthdr(bufnum(ounit))=nxthdr(bufnum(ounit))-80 + go to 100 + else + go to 40 + end if + end if +30 continue + +C OK, we can simply overwrite the old keyword with the new +40 continue + +C overwrite the old comment unless user supplied the magic value + if (comm .ne. '&')then + cmnt=comm + end if +C convert string to quoted character string (max length = 70 characters) + call fts2c(strval,value,clen,status) + if (status .gt. 0)go to 900 + +C find amount of space left for comment string +C (assume 10 char. for 'keyword = ', and 3 between value and comment) +C which leaves 67 spaces for the value string + comment string + nvalue=max(20,clen) + ncomm=67-nvalue + +C write the keyword record + keynam=keywrd + if (ncomm .gt. 0)then +C there is space for a comment + call ftmodr(ounit, + & keynam//'= '//value(1:nvalue)//' / '//cmnt(1:ncomm),status) + else +C no room for a comment + call ftmodr(ounit, + & keynam//'= '//value(1:nvalue)//' ',status) + end if + go to 900 + +100 continue + +C Either the old or new keyword is continued over multiple +C header card images, so have to use a less efficient way to modify +C the keyword by completely deleting the old and inserting the new. + +C read the old comment, if we need to preserve it + if (comm .eq. '&')then + call ftgkys(ounit,keywrd,value,cmnt,status) + if (status .gt. 0)go to 900 +C reset the current header pointer by 2 records to make +C it faster (usually) to find and delete the keyword + nxthdr(bufnum(ounit))=nxthdr(bufnum(ounit))-160 + else + cmnt=comm + end if + +C delete the old keyword + call ftdkey(ounit,keywrd,status) + if (status .gt. 0)go to 900 + +C insert the new keyword + call ftikys(ounit,keywrd,strval,cmnt,status) + +900 continue + end |