property.cpp

模拟P2P各种网络环境的,适合新手们的学习,不错的源码.

#include "Property.h"

#ifdef BUFSIZ
#undef BUFSIZ
#define BUFSIZ 4096
#endif

map<string, string> Property::getProperty() const
{ return property; }

static char *NextToken(char *buf);
static int GetKey(char *buf, char *ptr);
/* parse configure file, store it in cmap as (string, string) couple */
void Property::parseConfigFile(const string file)
{
/* The following codes are in c style. */
	char *p = NULL;
	char buf[BUFSIZ];
	char key[BUFSIZ];
	FILE *fp = NULL;
/* 
 * We read in the configure file, with each line as following:
 * # hello(comment) or
 * alpha = 0.25 (format: key = string) or
 * blank line(having no charactors)
 */
	fp = fopen(file.c_str(), "r");
	if(!fp) {
		printf("Open file for reading failed: %s, abort now\n", strerror(errno));
		exit(-1);
	}
	while(fgets(buf, BUFSIZ, fp))
	{
		p = NextToken(buf);
		if(!p)
			continue;
		else if(*p == '#')
			continue;
		else {
			assert(GetKey(key, p) > 0);
			string tmp = key;
			
			p = NextToken(NULL);
			p = NextToken(NULL);
			assert(p);
			assert(GetKey(key, p) > 0);
			property[tmp] = key;
		}
	}
}

static char *NextToken(char *pbuf)
{
	char *pp;
	static char *p;
	static char buf[BUFSIZ];
	if(pbuf)
	{
		strcpy(buf, pbuf);
		p = buf;
	}
 	while((*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r') && *p != '\0')
		p++;
	if(*p)
		pp = p;
	else
		pp = NULL;

	while(*p != '\0' && *p != ' ' && *p != '\t' && *p != '\n'  && *p != '\r')
		p++;
	return pp;
}

static int GetKey(char *buf, char *ptr)
{
	char *p;
	if(!buf || !ptr)
		return 0;
	p = buf;
	while(*ptr != '\0' && *ptr != ' ' && *ptr != '\t' && *ptr != '\n' && *p != '\r')
		*p++ = *ptr++;
	*p = '\0';
	return strlen(buf);
}