分割字符串(C版本)

//获取指定字符在字符串中出现次数
int GetCharOccurrence(char *strSource,char cDivider)
{
	if(strSource==NULL) return 0;

	int nCount=0;
	char *pStart=strSource;
	char* pDividerPos = strchr( pStart, cDivider);
	while(pDividerPos)
	{
		nCount++;
		pStart=pDividerPos+1;
		pDividerPos = strchr( pStart, cDivider);
	}

	return nCount;
}

char **StringDivision(char *strSource,char cDivider,int *nCount)
{
	if(strSource==NULL || strlen(strSource)==0) return NULL;

	*nCount=GetCharOccurrence(strSource,cDivider)+1;

	char **pSubStrings=(char**)malloc((*nCount)*sizeof(char*));
	memset(pSubStrings,0,(*nCount)*sizeof(char*));

	int nIndex=0;
	char *pStart=strSource;
	char* pDividerPos = strchr( pStart,cDivider);
	while(pDividerPos)
	{
		pSubStrings[nIndex]=(char*)malloc((pDividerPos-pStart+1)*sizeof(char));
		memset(pSubStrings[nIndex],0,(pDividerPos-pStart+1)*sizeof(char));

		strncpy(pSubStrings[nIndex],pStart,pDividerPos-pStart);
		pStart=pDividerPos+1;
		pDividerPos = strchr( pStart,cDivider);

		nIndex++;
	}

	pSubStrings[nIndex]=(char*)malloc((strlen(pStart)+1)*sizeof(char));
	memset(pSubStrings[nIndex],0,(strlen(pStart)+1)*sizeof(char));
	strcpy(pSubStrings[nIndex],pStart);

	return pSubStrings;
}
//释放内存
void FreeSubString(char** pSubStrings,int nCount)
{
	if(pSubStrings==NULL) return;

	for (int i=0;i<nCount;i++)
	{
		if(pSubStrings[i])
			free(pSubStrings[i]);
	}

	free(pSubStrings);
}
//用法
char strSample[]="aa,bb,cc,dd";
int nCount=0;
char **pSubString=StringDivision(strSample,',',&nCount);
FreeSubString(pSubString,nCount);