#include <string.h>#include <stdlib.h>unsigned int hex(char *str){    unsigned ret = 0;    int i = 0;    if((str[0] != '0') || ((str[1] != 'x') && (str[1] != 'X')))    {	        printf("str error!\n");        return -1;    }    for(i = 0; i < (strlen(str) - 2); i++)    {        if((str[2 + i] >= '0') && (str[2 + i] <= '9'))        {            ret += str[2 + i] - '0';        }        else if((str[2 + i] >= 'a') && (str[2 + i] <= 'f'))        {            //printf("detect a - f\n");            ret += 0xA + str[2 + i] - 'a';        }        else if((str[2 + i] >= 'A') && (str[2 + i] <= 'F'))        {            //printf("detect A - F\n");            ret += 0xA + str[2 + i] - 'A';        }	else        {            //printf("detect NONE\n");            ret += 0x0;        }        if(i < (strlen(str) - 3))        ret <<= 0x4;    }    //printf("ret = 0x%08x, strlen = %d\n", ret, strlen(str));     return ret;}