extern_interface/logqueueconfig/CCfgFileParser.cpp

//bb.cpp

#include <cstdio>
#include <cstring>
#include <fstream>
#include <cerrno>
#include <sstream>
#include <cstdlib>
#include <iostream>

#include   "CCfgFileParser.h"

using namespace std;

static inline bool istab(int c) { return (c == '\t'); }

static inline char *strltrim(char *str) {
	while (isspace(*str) || istab(*str)) {
		++str;
	}
	return str;
}

static inline char *strrtrim(char *str) {
	int len = strlen(str) - 1;
	while (isspace(str[len]) || istab(str[len])) {
		str[len--] = '\0';
	}
	return str;
}

//////////////////////////////////////////////////////////////////////   
//   Construction/Destruction   
//////////////////////////////////////////////////////////////////////   
int CCfgFileParser::parseFile(const char *lpszFilename) {
	using std::string;
	std::ifstream in1(lpszFilename);

	if (!in1.is_open()) return errno;

	char line[2048];
	char *pline;
	bool bInSection = false;
	SECTION_CONTENT *pSC = NULL;
	string strSection;
	std::pair<string, string> pairKeyValue;

	m_error_line = 0;
	m_content.clear();
	pSC = &m_content["default"];
	bInSection = true;
	string base64str("");
	string mystr("");
	while (!in1.eof()) {
		in1.getline(line, sizeof(line));

		if (line[strlen(line)] != '\n')
			mystr += line + string("\n");
		else
			mystr += line;

	}
	in1.close();

	stringstream in;
	in.str(mystr);

	while (!in.eof()) {    /*if(base64str.size() > sizeof(line))
		{
		printf("error in config parser!\n");
		return -1;
		}
		memcpy(line, base64str.c_str(), base64str.size());
		*/
		in.getline(line, sizeof(line));
		pline = line;
		++m_error_line;
		pline = strltrim(pline);
		if (pline[0] == '\0') continue;   //white   line,   skip
		if (pline[0] == m_chCommentMark) continue;   //comment   line,   skip
		if (bInSection) {
			//is   new-section   begin?
			if (pline[0] == m_chSectionBMark && extractSection(pline, strSection)) {
				pSC = &m_content[strSection];
			}
			else if (extractKeyValue(pline, pairKeyValue)) {
				//key-value   pair
				pSC->insert(pairKeyValue);
			}
			else {
				//in.close();
				return SYNTAX_ERROR;
			}
		}
		else {   //NOT   in   section
			//is   a   valid   section?
			if (extractSection(pline, strSection)) {
				pSC = &m_content[strSection];
				bInSection = true;
			}
			else {
				//in.close();
				return SYNTAX_ERROR;
			}
		}
	}
	//	in.close();   
	return 0;
}


bool CCfgFileParser::getValue(const std::string &strSection,
	const std::string &strKey, const char * &Value) const {
	FILE_CONTENT::const_iterator it;

	if ((it = m_content.find(strSection)) != m_content.end()) {
		SECTION_CONTENT::const_iterator p;
		const SECTION_CONTENT &section = (*it).second;//m_content[strSection];
		if ((p = section.find(strKey)) != section.end()) {
			Value = ((*p).second).c_str();
			return true;
		}
	}

	if (m_bShowError)
		fprintf(stderr, "***Error: fail to read [%s]:%s\n", strSection.c_str(), strKey.c_str());
	return false;
}

bool CCfgFileParser::getValue(const std::string &strKey, const char * &pValue) const {
	return getValue("default", strKey, pValue);
}

bool CCfgFileParser::getIntValue(const std::string &strSection,
	const std::string& strKey, long& Value) const {
	const char* pstr;
	if (getValue(strSection, strKey, pstr) && strlen(pstr) > 0)
	{
		if (strlen(pstr) > 0)
		{
			Value = atol(pstr);
			return true;
		}
	}
	if (m_bShowError)
		fprintf(stderr, "***Error: fail to read [%s]:%s\n", strSection.c_str(), strKey.c_str());
	return false;
}

bool CCfgFileParser::getIntValue(const std::string &strKey, long &Value) const {
	return getIntValue("default", strKey, Value);
}

bool CCfgFileParser::getDoubleValue(const std::string &strSection,
	const std::string &strKey, double &Value) const {
	const char *pstr;
	if (getValue(strSection, strKey, pstr) && strlen(pstr) > 0)
	{
		Value = atof(pstr);
		return true;
	}
	else
	{
		if (m_bShowError)
			fprintf(stderr, "***Error: fail to read [%s]:%s\n", strSection.c_str(), strKey.c_str());
		return false;
	}
}

bool CCfgFileParser::getDoubleValue(const std::string &strKey, double &Value) const {
	return getDoubleValue("default", strKey, Value);
}


/*
 *     Description: Extract   section   name
 *     Parameters: line[IN]---A   string   line   to   be   parsed
 * strSection[OUT]---Section   name
 *
 *     Return   Value: if   section   name   is   in   the   line   return   true,or   return   false
 */
bool CCfgFileParser::extractSection(char *line, std::string &strSection) {
	char *tmp;
	if (line[0] == m_chSectionBMark) {
		if ((tmp = strchr(++line, m_chSectionEMark)) != NULL) {
			*tmp = '\0';
			strSection = line;
			return true;
		}
	}

	return false;
}


/*
 *     Description: Parse   a   record   line   into   a   std:pair   as   key   and   value
 *     Parameters: line[IN]---A   string   to   be   parsed
 * pairKeyValue[OUT]---Parsing   result
 *
 *     Return   Value: If   parse   successfully   return   true,or   return   false
 */

bool CCfgFileParser::extractKeyValue(char *line,
	std::pair<std::string, std::string> &pairKeyValue) {
	char *tmp;
	if ((tmp = strchr(line, m_chRecordEMark)) != NULL || (tmp = strchr(line, '\r')) != NULL ||
		(tmp = strchr(line, '='))) {
		if (*tmp == '=')
			tmp = line + strlen(line); //  tmp++;
		*tmp = '\0';   //ignore   content   after   ';'(the   RecordEMark)
		if ((tmp = strchr(line, '=')) != NULL) {
			*tmp++ = '\0';
			tmp = strltrim(tmp);
			tmp = strrtrim(tmp);
			line = strrtrim(line);

			pairKeyValue.first = line;
			pairKeyValue.second = tmp;
			return true;
		}
	}

	return false;
}

const char *CCfgFileParser::getErrorString(int err) {
	static char buf[100];
	if (err == SYNTAX_ERROR) {
		sprintf(buf, "configuration   file   format   is   invalid   at   line   %d", m_error_line);
		return buf;
	}
	else {
		return strerror(err);
	}
}


void CCfgFileParser::printContent() {
	using std::cout;
	using std::endl;
	FILE_CONTENT::const_iterator pf;
	SECTION_CONTENT::const_iterator ps;
	for (pf = m_content.begin(); pf != m_content.end(); ++pf) {
		cout << "section:" << (*pf).first << endl;
		const SECTION_CONTENT &sc = (*pf).second;
		for (ps = sc.begin(); ps != sc.end(); ++ps) {
			cout << '\t' << (*ps).first << "=" << (*ps).second << endl;
		}
	}
}

// 在库中定义一个工厂函数 createParser
extern "C" __attribute__((visibility("default"))) CCfgFileParser* createParser() {
    return new CCfgFileParser();  // 在工厂函数中调用构造函数创建对象并返回指针
}

// 在库中定义一个销毁函数 deleteParser

extern "C" __attribute__((visibility("default"))) void deleteParser(CCfgFileParser* parser) {
    // 在销毁函数中调用析构函数销毁对象
	delete parser; 
}