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<H2><A NAME="SECTION000434000000000000000">SLA_DBJIN - Decode String to B/J Epoch (DP)</A>
<A NAME="xref_SLA_DBJIN"> </A><A NAME="SLA_DBJIN"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Decode a character string into a DOUBLE PRECISION number,
with special provision for Besselian and Julian epochs.
The string syntax is as for sla_DFLTIN, prefixed by
an optional `B' or `J'.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_DBJIN (STRING, NSTRT, DRESLT, J1, J2)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>STRING</EM></TD>
<TH ALIGN="LEFT"><B>C</B></TH>
<TD ALIGN="LEFT" NOWRAP>string containing field to be decoded</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>NSTRT</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>pointer to first character of field in string</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>NSTRT</EM></TD>
<TH ALIGN="LEFT"><B>I</B></TH>
<TD ALIGN="LEFT" NOWRAP>incremented past the decoded field</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DRESLT</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>result</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J1</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>DFLTIN status:</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> -1 = -OK</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 0 = +OK</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 1 = null field</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 2 = error</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J2</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>syntax flag:</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 0 = normal DFLTIN syntax</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 1 = `B' or `b'</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 2 = `J' or `j'</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>The purpose of the syntax extensions is to help cope with mixed
FK4 and FK5 data, allowing fields such as `B1950' or `J2000'
to be decoded.
<DT>2.
<DD>In addition to the syntax accepted by sla_DFLTIN,
the following two extensions are recognized by sla_DBJIN:
<DL COMPACT>
<DT>(a)
<DD>A valid non-null field preceded by the character `B'
(or `b') is accepted.
<DT>(b)
<DD>A valid non-null field preceded by the character `J'
(or `j') is accepted.
</DL>
<DT>3.
<DD>The calling program is told of the `B' or `J' through an
supplementary status argument. The rest of
the arguments are as for sla_DFLTIN.
</DL></DL>
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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