common.c

ertfs文件系统里面既有完整ucos程序

//< common.c >
/***************************************************************************/
#define SUCCESS 0 /* SUCCESS */
#define ERROR -1 /* ERROR */
/***************************************************************************/
char Bit$Count(unsigned char);
char Bit$CountWord(unsigned short);
void StringCopy(char *, char *, int);
int StringCmp(char *, char *, int);
/***************************************************************************
Common Subroutine
***************************************************************************/
char Bit$Count(unsigned char cdata)
{
	unsigned short bitcount=0;
	while(cdata) {
		bitcount+=(unsigned short)(cdata &0x01);
		cdata /=2;
	}
	return((char)bitcount);
}
char Bit$CountWord(unsigned short cdata)
{
	unsigned short bitcount=0;
	while(cdata) {
		bitcount+=(cdata &0x01);
		cdata /=2;
	}
	return((char)bitcount);
}
/***************************************************************************/
void StringCopy(char *stringA, char *stringB, int count)
{
	int i;
	for(i=0; i<count; i++)
		*stringA++ = *stringB++;
}
int StringCmp(char *stringA, char *stringB, int count)
{
	int i;
	for (i=0;i<count;i++)
		if (*stringA++ != *stringB++) return(ERROR);
		return(SUCCESS);
}