www.pudn.com > linuxsocket.rar > my_strcpy.c

#include  
#include  
 
char *my_strcpy(char *strDest, const char *strSrc) 
{ 
	char	*p_return = strDest; 
	 
	// 检查参数指针是否为空 
	if (strDest == NULL || strSrc == NULL) {   
		fprintf(stderr, "NULL POINT!"); 
		return NULL; 
	} 
	 
	while ( (*strDest++ = *strSrc++) != '\0') 
		; 
	return p_return; 
} 
 
int main() 
{ 
	char	string1[32]; 
	char	string2[32]; 
	int	c; 
	int	i = 0; 
 
	printf("please input your string:"); 
	// 对输入字符串的长度进行检查 
	while (  ( (c = getchar()) != '\n' ) && (c != EOF) && (i < 31)  )  { 
		string2[i] = c; 
		i++; 
	} 
	string2[i] = '\0'; 
 
	// 对返回值也进行合法性检查 
	if (my_strcpy(string1, string2) == NULL) { 
		fprintf(stderr, "return from my_strcpy"); 
		exit(1); 
	} 
 
	printf("string1:%s\n", string1); 
	printf("string2:%s\n", string2); 
 
	return 0; 
}