Locate a keyword in a string and extract the substring from 
   the beginning of the first word following the keyword to the 
   beginning of the first subsequent recognized terminator of a list. 

   None. 

   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   keywd      I   Word that marks the beginning of text of interest. 
   termlen    I   Length of strings in string array term.
   terms      I   Set of words, any of which marks the end of text. 
   nterms     I   Number of terms. 
   stringlen  I   Available space in argument string.
   substrlen  I   Available space in output substring.
   string    I/O  String containing a sequence of words. 
   found      O   SPICETRUE if the keyword is found in the string. 
   substr     O   String from end of keywd to beginning of first 
                  terms item found. 

   keywd          is a word used to mark the start of text of interest. 

   termlen        is the maximum number of characters that can be 
                  accommodated in the each element of the input argument 
                  terms.  This count includes room for the terminating null 
                  characters.  

   terms          is a set of words, any one of which may signal the 
                  end of text of interest.  

                  The array terms should be declared with dimensions

                     [nterms][termlen]

   nterms         is the number of elements in the array terms. 

   stringlen      is the maximum number of characters that can be 
                  accommodated in the in/out argument string.  This count 
                  includes room for the terminating null character.
                  For example, if the maximum allowed length of the 
                  output string, including the terminating null, is 25
                  characters, then stringlen should be set to 25.

   substrlen      is the maximum number of characters that can be 
                  accommodated in the output argument substr.  This count 
                  includes room for the terminating null character.

   string         is a character string made up of words, which may 
                  contain the keyword in keywd. 

   string         is the input string stripped of all words from 
                  the beginning of the keyword keywd to the end of 
                  the last word preceding one of the words in terms 
                  (or the end of the string if none of the terms follows 
                  keywd in the string). 

   found          is a flag indicating whether keywd is present in the 
                  input string.  found is set to SPICETRUE if the keyword
                  is present and SPICEFALSE otherwise.

   substr         is the substring that begins with the first word 
                  following keywd up to the beginning of any of the 
                  words in term or the end of the string.  If no words
                  are found between the keyword and the next terminator,
                  substr is returned empty.

                  substr cannot overwrite string.

   None. 

   Definitions: 

      A WORD     is a set of consecutive non-blank characters 
                 delimited by blanks or either end of the string 
                 that contains them. 

   Given a string and a keyword this routine locates the first 
   occurrence of the keyword in the string and returns the the 
   substring between the end of the keyword and the first occurrence 
   of any of the words in a list of terminating words.  If none 
   of the terminating words follows the keyword in the string, 
   the routine returns all of the string following the keyword. 

   If the next word following the keyword is a terminating word, 
   the substring returned will be empty. 

   If the keyword can not be located in the string, the variable 
   found will be returned as SPICEFALSE and the input string will be 
   unchanged.  The substring will be returned empty. 

   In all other cases, the part of the input string from the 
   beginning of the keyword to the start of the first terminating 
   word will be removed.  If no terminating word follows the keyword 
   the portion of the string from the keyword to the last non-blank 
   character of the string will be removed. 

   Example 1. 
   ---------- 
     Input:  string  "FROM 1 October 1984 12:00:00 TO 1 January 1987" 
             keywd   "TO" 
             terms   "FROM" 
                     "TO" 
                     "BEGINNING" 
                     "ENDING" 

     Output: string  "FROM 1 October 1984 12:00:00" 
             found   SPICETRUE 
             substr  "1 January 1987" 



   Example 2. 
   ---------- 
     Input:  string  "FROM 1 October 1984 12:00:00 TO 1 January 1987" 
             keywd   "FROM" 
             terms   "FROM" 
                     "TO" 
                     "BEGINNING" 
                     "ENDING" 

     Output: string  " TO 1 January 1987" 
             found   SPICETRUE 
             substr  "1 October 1984 12:00:00" 



   Example 3. 
   ---------- 
     Input:  string  "ADDRESS: 4800 OAK GROVE DRIVE PHONE: 354-4321 " 
             keywd   "ADDRESS:" 
             terms   "ADDRESS:" 
                     "PHONE:" 
                     "NAME:" 

     Output: string  " PHONE: 354-4321" 
             found   SPICETRUE 
             substr  "4800 OAK GROVE DRIVE" 


   Example 4. 
   ---------- 
     Input:  string  "ADDRESS: 4800 OAK GROVE DRIVE PHONE: 354-4321 " 
             keywd   "NAME:" 
             terms   "ADDRESS:" 
                     "PHONE:" 
                     "NAME:" 

     Output: string  "ADDRESS: 4800 OAK GROVE DRIVE PHONE: 354-4321" 
             found   SPICEFALSE 
             substr  "" 

   None.

   1) If any string pointer argument is null, the error
      SPICE(NULLPOINTER) will be signaled.

   2) If keywd has string length zero, the error SPICE(EMPTYSTRING) 
      will be signaled.

   3) If any of the arguments terms, string, or substr has length 
      less than 2, as indicated by their associated length arguments 
      termlen, stringlen and substrlen, the error SPICE(STRINGTOOSHORT) 
      will be signaled.

   None. 

   N.J. Bachman    (JPL)
   H.A. Neilan     (JPL) 
   W.L. Taber      (JPL) 

   None. 

   -CSPICE Version 1.0.0, 18-AUG-2002 (NJB) (HAN) (WLT)

   extract a substring starting with a keyword