C字符串常用函数的实现

总结一下C里面常用的字符串函数的实现代码~

//strlen

unsigned int strlenght(const char *src)


{


unsigned int len = 0;


while(*src++)


{


len++;


}


return len;


}





//strcat


char* strlink(char* dest,const char* src)


{


char *temp = dest;


while(*dest++);


*dest--;//移动到\0前一个元素处


while(*dest++=*src++);


return temp;


}





//strcpy


char* strcopy(char* dest,const char* src)


{


char *temp = dest;


while(*dest++ = *src++);


return temp;


}





//strcmp


int strcompare(const char* src1,const char*src2)


{


int x=0;


While(!(x = *src1-*src2) && *src1)


{


src1++;


src2++;


}


if(x>0)


x = 1;


if(x<0)


x = -1;


return x;





}