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: http://www.stsci.edu/~sontag/spicedocs/cspice/kxtrct_c.html
Дата изменения: Sat Dec 17 06:09:13 2005 Дата индексирования: Mon Apr 11 00:04:04 2016 Кодировка: Поисковые слова: mars global surveyor |
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.
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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.
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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 ""
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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.
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N.J. Bachman (JPL) H.A. Neilan (JPL) W.L. Taber (JPL)
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-CSPICE Version 1.0.0, 18-AUG-2002 (NJB) (HAN) (WLT)
extract a substring starting with a keyword