#endif
typedef void (*SIGNAL_HANDLER) (...);
// ResultList *htsearch(const String&, List &, Parser *);
void htsearch(Collection *, List &, Parser *);
void setupWords(char *, List &, int, Parser *, String &);
void createLogicalWords(List &, String &, String &);
void reportError(char *);
void convertToBoolean(List &words);
void doFuzzy(WeightWord *, List &, List &);
void addRequiredWords(List &, StringList &);
void usage();
int debug = 0;
int minimum_word_length = 3;
StringList boolean_keywords;
StringList collectionList; // List of databases to search on
// reconised word prefixes (for field-restricted search and per-word fuzzy
// algorithms) in *descending* alphabetical order.
// Don't use a dictionary structure, as setup time outweights saving.
struct {char *name; unsigned int flag; } colonPrefix [] =
{
{ "url", FLAG_URL },
{ "title", FLAG_TITLE },
{ "text", FLAG_PLAIN }, // FLAG_TEXT is 0, i.e. *no* flag...
{ "link", FLAG_LINK_TEXT },
{ "keyword", FLAG_KEYWORDS },
{ "hidden", FLAG_HIDDEN },
{ "heading", FLAG_HEADING },
{ "exact", FLAG_EXACT },
{ "descr", FLAG_DESCRIPTION },
// { "cap", FLAG_CAPITAL },
{ "author", FLAG_AUTHOR },
{ "", 0 },
};
//*****************************************************************************
// int main()
//
int
main(int ac, char **av)
{
int c;
extern char *optarg;
int override_config=0;
// List searchWords;
List *searchWords = NULL;
String configFile = DEFAULT_CONFIG_FILE;
int pageNumber = 1;
HtRegex limit_to;
HtRegex exclude_these;
String logicalWords;
String origPattern;
String logicalPattern;
// StringMatch searchWordsPattern;
StringMatch *searchWordsPattern = NULL;
StringList requiredWords;
int i;
Dictionary selected_collections; // Multiple database support
//
// Parse command line arguments
//
while ((c = getopt(ac, av, "c:dv")) != -1)
{
switch (c)
{
case 'c':
// The default is obviously to do this securely
// but if people want to shoot themselves in the foot...
#ifndef ALLOW_INSECURE_CGI_CONFIG
if (!getenv("REQUEST_METHOD"))
{
#endif
configFile = optarg;
override_config=1;
#ifndef ALLOW_INSECURE_CGI_CONFIG
}
#endif
break;
case 'v':
debug++;
break;
case 'd':
debug++;
break;
case '?':
usage();
break;
}
}
//
// The total search can NEVER take more than 5 minutes.
//
#ifndef _MSC_VER /* _WIN32 */
alarm(5 * 60);
#endif
//
// Parse the CGI parameters.
//
char none[] = "";
cgi input(optind < ac ? av[optind] : none);
// Multiple databases may be specified for search.
// Identify all databases specified with the "config=" parameter.
if (input.exists("config"))
{
collectionList.Create(input["config"], " \t\001|");
}
if (collectionList.Count() == 0)
collectionList.Add(""); // use default config
String errorMsg = "";
String originalWords = input["words"];
originalWords.chop(" \t\r\n");
HtConfiguration* config= HtConfiguration::config();
// Iterate over all specified collections (databases)
for (int cInd=0; errorMsg.empty() && cInd < collectionList.Count(); cInd++)
{
// Each collection is handled in an iteration. Reset the following so
// that we start with a clean slate.
//
logicalWords = 0;
origPattern = 0;
logicalPattern = 0;
searchWords = new List;
searchWordsPattern = new StringMatch;
char *config_name = collectionList[cInd];
if (config_name && config_name[0] == '\0')
config_name = NULL; // use default config
//
// Setup the configuration database. First we read the compiled defaults.
// Then we override those with defaults read in from the configuration
// file, and finally we override some attributes with information we
// got from the HTML form.
//
config->Defaults(&defaults[0]);
// To allow . in filename while still being 'secure',
// e.g. htdig-f.q.d.n.conf
if (!override_config && config_name
&& (strstr(config_name, "./") == NULL))
{
char *configDir = getenv("CONFIG_DIR");
if (configDir)
{
configFile = configDir;
}
else
{
configFile = CONFIG_DIR;
}
if (strlen(config_name) == 0)
configFile = DEFAULT_CONFIG_FILE;
else
configFile << '/' << config_name << ".conf";
}
if (access((char*)configFile, R_OK) < 0)
{
reportError(form("Unable to read configuration file '%s'",
configFile.get()));
}
config->Read(configFile);
// Initialize htword library (key description + wordtype...)
WordContext::Initialize(*config);
if (input.exists("method"))
config->Add("match_method", input["method"]);
if (input.exists("format"))
config->Add("template_name", input["format"]);
if (input.exists("matchesperpage"))
{
// minimum check for a valid int value of "matchesperpage" cgi variable
if (atoi(input["matchesperpage"]) > 0)
config->Add("matches_per_page", input["matchesperpage"]);
}
if (input.exists("page"))
pageNumber = atoi(input["page"]);
if (input.exists("config"))
config->Add("config", input["config"]);
if (input.exists("restrict"))
config->Add("restrict", input["restrict"]);
if (input.exists("exclude"))
config->Add("exclude", input["exclude"]);
if (input.exists("keywords"))
config->Add("keywords", input["keywords"]);
requiredWords.Create(config->Find("keywords"), " \t\r\n\001");
if (input.exists("sort"))
config->Add("sort", input["sort"]);
// Changes added 3-31-99, by Mike Grommet
// Check form entries for starting date, and ending date
// Each date consists of a month, day, and year
if (input.exists("startmonth"))
config->Add("startmonth", input["startmonth"]);
if (input.exists("startday"))
config->Add("startday", input["startday"]);
if (input.exists("startyear"))
config->Add("startyear", input["startyear"]);
if (input.exists("endmonth"))
config->Add("endmonth", input["endmonth"]);
if (input.exists("endday"))
config->Add("endday", input["endday"]);
if (input.exists("endyear"))
config->Add("endyear", input["endyear"]);
// END OF CHANGES BY MIKE GROMMET
minimum_word_length = config->Value("minimum_word_length", minimum_word_length);
StringList form_vars(config->Find("allow_in_form"), " \t\r\n");
for (i= 0; i < form_vars.Count(); i++)
{
if (input.exists(form_vars[i]))
config->Add(form_vars[i], input[form_vars[i]]);
}
//
// Compile the URL limit patterns.
//
if (config->Find("restrict").length())
{
// Create a temporary list from either the configuration
// file or the input parameter
StringList l(config->Find("restrict"), " \t\r\n\001|");
limit_to.setEscaped(l);
String u = l.Join('|');
config->Add("restrict", u); // re-create the config attribute
}
if (config->Find("exclude").length())
{
// Create a temporary list from either the configuration
// file or the input parameter
StringList l(config->Find("exclude"), " \t\r\n\001|");
exclude_these.setEscaped(l);
String u = l.Join('|');
config->Add("exclude", u); // re-create the config attribute
}
//
// Check url_part_aliases and common_url_parts for
// errors.
String url_part_errors = HtURLCodec::instance()->ErrMsg();
if (url_part_errors.length() != 0)
reportError(form("Invalid url_part_aliases or common_url_parts: %s",
url_part_errors.get()));
// for htsearch, use search_rewrite_rules attribute for HtURLRewriter.
config->AddParsed("url_rewrite_rules", "${search_rewrite_rules}");
url_part_errors = HtURLRewriter::instance()->ErrMsg();
if (url_part_errors.length() != 0)
reportError(form("Invalid url_rewrite_rules: %s",
url_part_errors.get()));
// Load boolean_keywords from configuration
// they should be placed in this order:
// 0 1 2
// and or not
boolean_keywords.Destroy();
boolean_keywords.Create(config->Find("boolean_keywords"),
"| \t\r\n\001");
if (boolean_keywords.Count() != 3)
reportError("boolean_keywords attribute should have three entries");
Parser *parser = new Parser();
//
// Parse the words to search for from the argument list.
// This will produce a list of WeightWord objects.
//
setupWords(originalWords, *searchWords,
strcmp(config->Find("match_method"), "boolean") == 0,
parser, origPattern);
//
// Convert the list of WeightWord objects to a pattern string
// that we can compile.
//
createLogicalWords(*searchWords, logicalWords, logicalPattern);
//
// Assemble the full pattern for excerpt matching and highlighting
//
origPattern += logicalPattern;
searchWordsPattern->IgnoreCase();
searchWordsPattern->IgnorePunct();
searchWordsPattern->Pattern(logicalPattern); // this should now be enough
//searchWordsPattern.Pattern(origPattern);
//if (debug > 2)
// cout << "Excerpt pattern: " << origPattern << "\n";
//
// If required keywords were given in the search form, we will
// modify the current searchWords list to include the required
// words.
//
if (requiredWords.Count() > 0)
{
addRequiredWords(*searchWords, requiredWords);
}
//
// Perform the actual search. The function htsearch() is used for this.
// The Dictionary it returns is then passed on to the Display object to
// actually render the results in HTML.
//
const String word_db = config->Find("word_db");
if (access(word_db, R_OK) < 0)
{
reportError(form("Unable to read word database file '%s'\nDid you run htdig?",
word_db.get()));
}
// ResultList *results = htsearch((char*)word_db, searchWords, parser);
String doc_index = config->Find("doc_index");
if (access((char*)doc_index, R_OK) < 0)
{
reportError(form("Unable to read document index file '%s'\nDid you run htdig?",
doc_index.get()));
}
const String doc_db = config->Find("doc_db");
if (access(doc_db, R_OK) < 0)
{
reportError(form("Unable to read document database file '%s'\nDid you run htdig?",
doc_db.get()));
}
const String doc_excerpt = config->Find("doc_excerpt");
if (access(doc_excerpt, R_OK) < 0)
{
reportError(form("Unable to read document excerpts '%s'\nDid you run htdig?",
doc_excerpt.get()));
}
// Multiple database support
Collection *collection = new Collection((char*)configFile,
word_db.get(), doc_index.get(), doc_db.get(), doc_excerpt.get());
// Perform search within the collection. Each collection stores its
// own result list.
htsearch(collection, *searchWords, parser);
collection->setSearchWords(searchWords);
collection->setSearchWordsPattern(searchWordsPattern);
selected_collections.Add(configFile, collection);
if (parser->hadError())
errorMsg = parser->getErrorMessage();
delete parser;
}
// Display display(doc_db, 0, doc_excerpt);
Display display(&selected_collections);
if (display.hasTemplateError())
{
reportError(form("Unable to read template file '%s'\nDoes it exist?",
(const char*)config->Find("template_name")));
return 0;
}
display.setOriginalWords(originalWords);
// display.setResults(results);
// display.setSearchWords(&searchWords);
display.setLimit(&limit_to);
display.setExclude(&exclude_these);
// display.setAllWordsPattern(searchWordsPattern);
display.setCGI(&input);
display.setLogicalWords(logicalWords);
if (!errorMsg.empty())
display.displaySyntaxError(errorMsg);
else
display.display(pageNumber);
// delete results;
// delete parser;
return 0;
}
//*****************************************************************************
void
createLogicalWords(List &searchWords, String &logicalWords, String &wm)
{
String pattern;
int i;
int wasHidden = 0;
int inPhrase = 0;
for (i = 0; i < searchWords.Count(); i++)
{
WeightWord *ww = (WeightWord *) searchWords[i];
if (!ww->isHidden)
{
if (strcmp((char*)ww->word, "&") == 0 && wasHidden == 0)
logicalWords << ' ' << boolean_keywords[AND] << ' ';
else if (strcmp((char*)ww->word, "|") == 0 && wasHidden == 0)
logicalWords << ' ' << boolean_keywords[OR] << ' ';
else if (strcmp((char*)ww->word, "!") == 0 && wasHidden == 0)
logicalWords << ' ' << boolean_keywords[NOT] << ' ';
else if (strcmp((char*)ww->word, "\"") == 0 && wasHidden == 0)
{
if (inPhrase)
logicalWords.chop(' ');
inPhrase = !inPhrase;
logicalWords << "\"";
}
else if (wasHidden == 0)
{
logicalWords << ww->word;
if (inPhrase)
logicalWords << " ";
}
wasHidden = 0;
}
else
wasHidden = 1;
// generate patterns to search for and highlight in excerpt
if (ww->weight > 0 // Ignore boolean syntax stuff
&& (!ww->isIgnore || inPhrase)) // Ignore bad/short words
{ // but highlight them in phrases
char spacer = inPhrase ? ' ' : '|';
if (wm.length())
wm << spacer;
wm << ww->word;
if (!ww->isIgnore) // ignore bad/short words for searching
{
if (pattern.length())
pattern << spacer;
pattern << ww->word;
}
}
}
if (debug)
{
cerr << "LogicalWords: " << logicalWords << endl;
cerr << "Pattern: " << pattern << endl;
cerr << "Highlight Pattern: " << wm << endl;
}
}
void
dumpWords(List &words, char *msg = "")
{
if (debug)
{
cerr << msg << ": '";
for (int i = 0; i < words.Count(); i++)
{
WeightWord *ww = (WeightWord *) words[i];
cerr << ww->word << ':' << ww->isHidden << ' ';
}
cerr << "'\n";
}
}
//*****************************************************************************
// void setupWords(char *allWords, List &searchWords,
// int boolean, Parser *parser, String &originalPattern)
//
void
setupWords(char *allWords, List &searchWords, int boolean, Parser *parser,
String &originalPattern)
{
HtConfiguration* config= HtConfiguration::config();
List tempWords;
int i;
//
// Parse the words we need to search for. It should be a list of words
// with optional 'and' and 'or' between them. The list of words
// will be put in the searchWords list and at the same time in the
// String pattern separated with '|'.
//
//
// Convert the string to a list of WeightWord objects. The special
// characters '(' and ')' will be put into their own WeightWord objects.
//
unsigned char *pos = (unsigned char*) allWords;
unsigned char t;
String word;
const String prefix_suffix = config->Find("prefix_match_character");
while (*pos)
{
while (1)
{
if (debug > 3)
cerr << "setupWords: " << pos << endl;
t = *pos++;
if (isspace(t))
{
continue;
}
else if (t == '"')
{
tempWords.Add(new WeightWord("\"", -1.0));
break;
}
else if (boolean && (t == '(' || t == ')'))
{
char s[2];
s[0] = t;
s[1] = '\0';
tempWords.Add(new WeightWord(s, -1.0));
break;
}
else if (HtIsWordChar(t) ||
(strchr(prefix_suffix, t) != NULL) ||
(t >= 161 && t <= 255))
{
unsigned int fieldFlag = 0;
word = 0;
do // while recognised prefix, followed by ':'
{
while (t && (HtIsWordChar(t) ||
(strchr(prefix_suffix, t) != NULL) ||
(t >= 161 && t <= 255)))
{
word << (char) t;
t = *pos++;
}
if (debug > 2)
cerr << "word: " << word << endl;
if (t == ':') // e.g. "author:word" to search
{ // only in author
word.lowercase();
t = *pos++;
if (t && (HtIsWordChar (t) ||
(strchr(prefix_suffix, t) != NULL) ||
(t >= 161 && t <= 255)))
{
int i, cmp;
const char *w = word.get();
// linear search of known prefixes, with "" flag.
for (i = 0; (cmp = mystrcasecmp (w, colonPrefix[i].name)) < 0; i++)
;
if (debug > 2)
cerr << "field: "<< colonPrefix[i].name << endl;
if (cmp == 0) // if prefix found...
{
fieldFlag |= colonPrefix [i].flag;
word = 0;
}
}
}
} while (!word.length() && t);
pos--;
if (!t && !word.length()) // query ended with junk chars
break;
if (boolean && (mystrcasecmp(word.get(), "+") == 0
|| mystrcasecmp(word.get(), boolean_keywords[AND]) == 0))
{
tempWords.Add(new WeightWord("&", -1.0));
}
else if (boolean &&
mystrcasecmp(word.get(), boolean_keywords[OR]) == 0)
{
tempWords.Add(new WeightWord("|", -1.0));
}
else if (boolean && (mystrcasecmp(word.get(), "-") == 0
|| mystrcasecmp(word.get(), boolean_keywords[NOT]) == 0))
{
tempWords.Add(new WeightWord("!", -1.0));
}
else
{
// Add word to excerpt matching list
originalPattern << word << "|";
WeightWord *ww = new WeightWord(word, 1.0, fieldFlag);
if(HtWordNormalize(word) & WORD_NORMALIZE_NOTOK)
ww->isIgnore = 1;
tempWords.Add(ww);
}
break;
}
}
}
dumpWords(tempWords, "tempWords");
//
// If the user specified boolean expression operators, the whole
// expression has to be syntactically correct. If not, we need
// to report a syntax error.
//
if (boolean)
{
if (!parser->checkSyntax(&tempWords))
{
for (i = 0; i < tempWords.Count(); i++)
{
searchWords.Add(tempWords[i]);
}
tempWords.Release();
return;
// reportError("Syntax error");
}
}
else
{
convertToBoolean(tempWords);
}
dumpWords(tempWords, "Boolean");
//
// We need to assign weights to the words according to the search_algorithm
// configuration attribute.
// For algorithms other than exact, we need to also do word lookups.
//
StringList algs(config->Find("search_algorithm"), " \t");
List algorithms;
String name, weight;
double fweight;
Fuzzy *fuzzy = 0;
//
// Generate the list of algorithms to use and associate the given
// weights with them.
//
for (i = 0; i < algs.Count(); i++)
{
name = strtok(algs[i], ":");
weight = strtok(0, ":");
if (name.length() == 0)
name = "exact";
if (weight.length() == 0)
weight = "1";
fweight = atof((char*)weight);
fuzzy = Fuzzy::getFuzzyByName(name, *config);
if (fuzzy)
{
if (debug > 1)
cerr << "Adding algorithm " << name.get() << endl;
fuzzy->setWeight(fweight);
fuzzy->openIndex();
algorithms.Add(fuzzy);
} else if (debug)
cerr << "Unknown fuzzy search algorithm " << name.get() << endl;
}
dumpWords(searchWords, "initial");
//
// For each of the words, apply all the algorithms.
//
int in_phrase = 0; // If we get into a phrase, we don't want to fuzz.
for (i = 0; i < tempWords.Count(); i++)
{
WeightWord *ww = (WeightWord *) tempWords[i];
if (ww->weight > 0 && !ww->isIgnore && !in_phrase)
// I think that should be:
// if (ww->weight > 0 && !ww->isIgnore && !in_phrase && !ww->isExact)
{
//
// Apply all the algorithms to the word.
//
if (debug)
cerr << "Fuzzy on: " << ww->word << endl;
doFuzzy(ww, searchWords, algorithms);
delete ww;
}
else if (ww->word.length() == 1 && ww->word[0] == '"')
{
in_phrase = !in_phrase;
if (debug)
cerr << "Add: " << ww->word << endl;
searchWords.Add(ww);
}
else
{
//
// This is '(', ')', '&', or '|'. These will be automatically
// transfered to the searchWords list.
//
if (debug)
cerr << "Add: " << ww->word << endl;
searchWords.Add(ww);
}
dumpWords(searchWords, "searchWords");
}
tempWords.Release();
}
//*****************************************************************************
void
doFuzzy(WeightWord *ww, List &searchWords, List &algorithms)
{
List fuzzyWords;
List weightWords;
Fuzzy *fuzzy = 0;
WeightWord *newWw = 0;
String *word = 0;
algorithms.Start_Get();
while ((fuzzy = (Fuzzy *) algorithms.Get_Next()))
{
if (debug > 1)
cerr << " " << fuzzy->getName();
fuzzy->getWords(ww->word, fuzzyWords);
fuzzyWords.Start_Get();
while ((word = (String *) fuzzyWords.Get_Next()))
{
if (debug > 1)
cerr << " " << word->get();
// (should be a "copy with changed weight" constructor...)
newWw = new WeightWord(word->get(), fuzzy->getWeight());
newWw->isExact = ww->isExact;
newWw->isHidden = ww->isHidden;
newWw->flags = ww->flags;
weightWords.Add(newWw);
}
if (debug > 1)
cerr << endl;
fuzzyWords.Destroy();
}
//
// We now have a list of substitute words. They need to be added
// to the searchWords.
//
if (weightWords.Count())
{
if (weightWords.Count() > 1)
searchWords.Add(new WeightWord("(", -1.0));
for (int i = 0; i < weightWords.Count(); i++)
{
if (i > 0)
searchWords.Add(new WeightWord("|", -1.0));
searchWords.Add(weightWords[i]);
}
if (weightWords.Count() > 1)
searchWords.Add(new WeightWord(")", -1.0));
}
else // if no fuzzy matches, add exact word, but give it tiny weight
{
searchWords.Add(new WeightWord(ww->word.get(), 0.000001));
}
weightWords.Release();
}
//*****************************************************************************
// void convertToBoolean(List &words)
//
void
convertToBoolean(List &words)
{
HtConfiguration* config= HtConfiguration::config();
List list;
int i;
int do_and = strcmp(config->Find("match_method"), "and") == 0;
int in_phrase = 0;
String quote = "\"";
if (words.Count() == 0)
return;
list.Add(words[0]);
// We might start off with a phrase match
if (((WeightWord *) words[0])->word == quote)
in_phrase = 1;
for (i = 1; i < words.Count(); i++)
{
if (do_and && !in_phrase)
list.Add(new WeightWord("&", -1.0));
else if (!in_phrase)
list.Add(new WeightWord("|", -1.0));
if (((WeightWord *) words[i])->word == quote)
in_phrase = !in_phrase;
list.Add(words[i]);
}
words.Release();
for (i = 0; i < list.Count(); i++)
{
words.Add(list[i]);
}
list.Release();
}
//*****************************************************************************
// Dictionary *htsearch(char *wordfile, List &searchWords, Parser *parser)
// This returns a dictionary indexed by document ID and containing a
// List of HtWordReference objects.
//
void
htsearch(Collection *collection, List &searchWords, Parser *parser)
{
//
// Pick the database type we are going to use
//
ResultList *matches = new ResultList;
if (searchWords.Count() > 0)
{
// parser->setDatabase(wordfile);
parser->setCollection(collection);
parser->parse(&searchWords, *matches);
}
collection->setResultList(matches);
// return matches;
}
//*****************************************************************************
// Modify the search words list to include the required words as well.
// This is done by putting the existing search words in parenthesis and
// appending the required words separated with "and".
void
addRequiredWords(List &searchWords, StringList &requiredWords)
{
HtConfiguration* config= HtConfiguration::config();
static int any_keywords = config->Boolean("any_keywords", 0);
if (requiredWords.Count() == 0)
return;
if (searchWords.Count() > 0)
{
searchWords.Insert(new WeightWord("(", -1.0), 0);
searchWords.Add(new WeightWord(")", -1.0));
searchWords.Add(new WeightWord("&", -1.0));
}
if (requiredWords.Count() == 1)
{
searchWords.Add(new WeightWord(requiredWords[0], 1.0));
}
else
{
searchWords.Add(new WeightWord("(", -1.0));
searchWords.Add(new WeightWord(requiredWords[0], 1.0));
for (int i = 1; i < requiredWords.Count(); i++)
{
if (any_keywords)
searchWords.Add(new WeightWord("|", -1.0));
else
searchWords.Add(new WeightWord("&", -1.0));
searchWords.Add(new WeightWord(requiredWords[i], 1.0));
}
searchWords.Add(new WeightWord(")", -1.0));
}
}
//*****************************************************************************
// Report an error. Since we don' know if we are running as a CGI or not,
// we will assume this is the first thing returned by a CGI program.
//
void
reportError(char *msg)
{
HtConfiguration* config= HtConfiguration::config();
cout << "Content-type: text/html\r\n\r\n";
cout << "htsearch error\n";
cout << "\n";
cout << "ht://Dig error
\n";
cout << "htsearch detected an error. Please report this to the\n";
cout << "webmaster of this site by sending an e-mail to:\n";
cout << "Find("maintainer") << "\">";
cout << config->Find("maintainer") << "\n";
cout << "The error message is:
\n";
cout << "\n" << msg << "\n
\n\n";
exit(1);
}
//*****************************************************************************
// void usage()
// Display program usage information--assumes we're running from a cmd line
//
void usage()
{
cout << "usage: htsearch [-v][-d][-c configfile] [query_string]\n";
cout << "This program is part of ht://Dig " << VERSION << "\n\n";
cout << "Options:\n";
cout << "\t-v -d\tVerbose mode. This increases the verbosity of the\n";
cout << "\t\tprogram. Using more than 2 is probably only useful\n";
cout << "\t\tfor debugging purposes. The default verbose mode\n";
cout << "\t\tgives a progress on what it is doing and where it is.\n\n";
cout << "\t-c configfile\n";
cout << "\t\tUse the specified configuration file instead on the\n";
cout << "\t\tdefault.\n\n";
cout << "\tquery_string\tA CGI-style query string can be given as a single\n";
cout << "\t\targument, and is only used if the REQUEST_METHOD environment\n";
cout << "\t\tvariable is not set. If no query_string is given, and\n";
cout << "\t\tREQUEST_METHOD is not set, htsearch will prompt for the query.\n\n";
exit(0);
}