将一个字符串按照单词逆转

#include <stdio.h>


size_t _strlen(const char *str)
{
	if(str==NULL ||  *str == '\0') return 0;
	size_t count = 0;
	while(*str++)
	{
		count++;
	}
	return count;
}

size_t _wordlen(const char * str)
{
	if(str==NULL ||  *str == '\0') return 0;
	size_t count = 0;
	while(*str)
	{
		if(*str==' ') break;
		count++;
		str++;
	}
	return count;
}

void reverse_str(char* str,size_t t)
{
	if(str==NULL ||  *str == '\0') return;
	char* p1=str;
	char* p2=str+t-1;
	while (p1<p2)
	{
		*p1=*p1^*p2;
		*p2=*p1^*p2;
		*p1=*p1^*p2;

		p1++;
		p2--;
	}
}



void reverse_words(char* str)
{
	if(str==NULL ||  *str == '\0') return;
	reverse_str(str,_strlen(str));

	
	reverse_str(str,_wordlen(str));

	while (*str++)
	{
		if (*str == ' ')
		{
			reverse_str(str+1,_wordlen(str+1));
		}
	}

	
}

void main(void)
{
	char words[]="my name is g0;";

	printf("%s\n",words);
	reverse_words(words);
	printf("%s\n",words);
}