5th IP address restore

这次欠债比较多，所以，这次的代码风格很差。方法是最暴力的暴力求解法。

//ip restore//if input is 19216811//out put should be 192.168.1.1 or 19.216.8.11 or some_str available else#include <stdio.h>#include <string.h>#include <stdlib.h>#define LOG_FLAG 1/*description: API to get substring in C codeowner: howyee*/int substring_king(char *src,char *dst,int start,int end){//memset(a,0,20*sizeof(char));memset(dst,0,strlen(dst)*sizeof(char));dst = strncpy(dst,src+start,end-start);return 0;}int is_valid(char *sub_ip){//puts(sub_ip);if(atoi(sub_ip)>255)return -1;elsereturn 0;}//1.9.2.1681212// char *strncpy(char *dest, const char *src，int count)int ip_process(char *ip_buf , int lens_ip){int i,j,k;char buf_1[5],buf_2[5],buf_3[5],buf_4[5];for(i=0;i<lens_ip-1;i++)for(j=i+1;j<lens_ip-1;j++)for(k=j+1;k<lens_ip-1;k++){substring_king(ip_buf,buf_1,0,i+1);printf("buf_1 %s atoi %d\n", buf_1 ,atoi(buf_1));substring_king(ip_buf,buf_2,i+1,j+1);printf("buf_2 %s atoi %d\n", buf_2 ,atoi(buf_2));substring_king(ip_buf,buf_3,j+1,k+1);printf("buf_3 %s atoi %d\n", buf_3 ,atoi(buf_3));substring_king(ip_buf,buf_4,k+1,lens_ip);printf("buf_4 %s atoi %d\n", buf_4 ,atoi(buf_4));//if((is_valid_sub_ip(buf_1)==0)&&((is_valid_sub_ip(buf_1)==0)&&((is_valid_sub_ip(buf_1)==0)&&((is_valid_sub_ip(buf_1)==0)))if((is_valid(buf_1)==0)&&(is_valid(buf_2)==0)&&(is_valid(buf_3)==0)&&(is_valid(buf_4)==0)){printf("good ip%s %s %s %s\n",buf_1,buf_2,buf_3,buf_4);}}}int test_case(char *temp_buf){char temp[15];//puts(temp);substring_king(temp_buf,temp,0,3);puts(temp);substring_king(temp_buf,temp,1,2);puts(temp);substring_king(temp_buf,temp,2,3);puts(temp);substring_king(temp_buf,temp,3,5);puts(temp);}int main(int argc, char **argv){char ip_input[20] , temp[15];if(argc!=2){printf("Usage: ip_restore ip_addr\n");//return -1;        gets(ip_input);}    else        strcpy(ip_input,argv[1]);#if LOG_FLAGputs(ip_input);//test_case(ip_input);#endif//max lens of ip is 12substring_king(ip_input,temp,0,1);puts(temp);if(strlen(ip_input)>12){printf("too long for a ip ip_addr\n");return -1;}else{ip_process(ip_input,strlen(ip_input));}}