C++ 去掉字符串首尾的 \x20 \r \n 字符

转载:http://www.sharejs.com/codes/cpp/5780

 1 /*
 2 去掉字符串首尾的 \x20 \r \n 字符
 3 by sincoder
 4 */
 5 void clean_string(char *str)
 6 {
 7     char *start = str - 1;
 8     char *end = str;
 9     char *p = str;
10     while(*p)
11     {
12         switch(*p)
13         {
14         case ‘ ‘:
15         case ‘\r‘:
16         case ‘\n‘:
17             {
18                 if(start + 1==p)
19                     start = p;
20             }
21             break;
22         default:
23             break;
24         }
25         ++p;
26     }
27     //现在来到了字符串的尾部 反向向前
28     --p;
29     ++start;
30     if(*start == 0)
31     {
32         //已经到字符串的末尾了
33         *str = 0 ;
34         return;
35     }
36     end = p + 1;
37     while(p > start)
38     {
39         switch(*p)
40         {
41         case ‘ ‘:
42         case ‘\r‘:
43         case ‘\n‘:
44             {
45                 if(end - 1 == p)
46                     end = p;
47             }
48             break;
49         default:
50             break;
51         }
52         --p;
53     }
54     memmove(str,start,end-start);
55     *(str + (int)end - (int)start) = 0;
56 }
57
58 //该代码片段来自于: http://www.sharejs.com/codes/cpp/5780