Datums (spheroid) definitions in Grass

[Ana Isabel Donadios Algarra]

Hello everybody:
 
    We are working with in a program similar to m.datum.shift. We need this program calculates itself the shift values. 
    We are going to use the datum's definitions that we have found on datum.c file:
 
    File $GISBASE/src/libes/coorcnv/datum.c:
    ---------------------------------------------------  
 
    "wgs72", "World Geodetic System 1972",         0.0,    0.0,    0.0,
    "na27",  "North American 1927",              -22.0,  157.0,  176.0,
    "a&c",   "Alaska and Canada",                 -9.0,  139.0,  173.0,
    "eur",   "European",                         -84.0, -103.0, -127.0,
    "tokyo", "Tokyo",                           -140.0,  516.0,  673.0,
    "aus",   "Australian Geodetic",             -122.0,  -41.0,  146.0,
    "osgb",  "Ordnance Survey of Great Britain", 368.0, -120.0,  425.0,
    "sa69",  "South American 1969",              -77.0,    3.0,  -45.0
 
    ----------------------------------------------------
    
    We also need to add other datums. So, our new datum's table is the next:
 
     DATUM        dx          dy          dz          ELLIPSOID
     =====        ==          ==          ==          =========
 
     grs80        ?           ?           ?           grs80
     wgs84        0           0           0           wgs84
     wgs72        0           0           0           wgs72
     eur50      -84        -103        -127           hayford - international
     na27       -22         157         176           clarke66
     arc50        ?           ?           ?           clarke80
     osGB       368        -120         425           airy
     aus       -122         -41         146           australian 
     tokyo     -140         516         673           bessel
     indian       ?           ?           ?           everest30
     afgooye      ?           ?           ?           krassovsky
     sa69         ?           ?           ?           s. america
     ?            ?           ?           ?           new international 
 
    We would like TO COMFIRM if our table is right. Also we need to complete it because we don't know the shitf values of the next datums (character ? in the table ): 
    grs80: ellipsoid grs80
    arc50: ellipsoid Clarke 80
    indian: ellipsoid Everest 30
    afgooye: ellipsoid Krassovsky
    sa69: ellipsoid South America 69
 
    Could any one help us, please?
    Thanks in advance
 
    Anabel Donadios
    Email: anabel at asterix.fi.upm.es
    Spain