【C语言】实现字符串右移位函数

请实现字符串右移位函数，比如："abcdefghi"循环右移2位就是"hiabcdefg"。

函数原型：void RightLoopMove(char *str, unsigned short steps)

函数参数说明：

pStr: Point to a '\0' terminated string.

steps: The rotate shift numbers.

①暴力移位法：

#include <stdio.h>
#include <string.h>
#include <assert.h>

void RightLoopMove(char *pStr, unsigned short steps)
{
	int i = 0;
	int len = strlen(pStr);
	assert(pStr);
	for (i = 0; i < steps; i++)
	{
		char *pend = pStr + len - 1;
		char tmp = *(pStr + len - 1);
		while (pStr <= pend)
		{
			*pend = *(pend - 1);
			pend--;
		}
		*pStr = tmp;
	}
}
int main()
{
	char str[] = "abcdef";
	RightLoopMove(str, 2);
	printf("%s\n", str);
	getchar();
	return 0;
}

②三步翻转法：

#include <stdio.h>
#include <string.h>
#include <assert.h>

void StrReverse(char *pStart, char *pEnd)
{
	assert(pStart);
	assert(pEnd);
	while (pStart < pEnd)
	{
		char tmp = *pStart;
		*pStart = *pEnd;
		*pEnd = tmp;
		pStart++;
		pEnd--;
	}
}
void RightLoopMove(char *pStr, unsigned short steps)
{
	int len = strlen(pStr);
	assert(pStr);
	StrReverse(pStr, pStr + len - 1 - steps);
	StrReverse(pStr + len - steps, pStr + len - 1);
	StrReverse(pStr, pStr + len - 1);
}
int main()
{
	char str[] = "abcdef";
	RightLoopMove(str, 3);
	printf("%s\n", str);
	getchar();
	return 0;
}