写了一个去除空格的函数^_^.

直接贴源码吧，主要是备查。

file: trim.c

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1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. #include <string.h>
   
4. #include <ctype.h>
   
5. 
   
6. #ifndef SUCCESS
   
7. #define SUCCESS 1
   
8. #endif
   
9. 
   
10. /* TRIM LEFT */
    
11. 
    
12. int rtrim( char *pszString)
    
13. {
    
14.     int nForwardCursor = 0;
    
15.     int nTrailingCursor = 0;
    
16.     int bTrim = 1;
    
17. 
    
18.     for( nForwardCursor = 0 ; pszString[nForwardCursor] != '\0'; nForwardCursor++ )
    
19.         if ( bTrim && isspace( pszString[nForwardCursor] ))
    
20.             continue ;
    
21.         else {
    
22.             bTrim = 0;
    
23.             pszString[nTrailingCursor] = pszString[nForwardCursor];
    
24.             nTrailingCursor++;
    
25.         }
    
26.     pszString[nTrailingCursor] = '\0';
    
27.     return SUCCESS;
    
28. }
    
29. 
    
30. /* TRIM RIGHT */
    
31. int ltrim( char *pszString )
    
32. {
    
33.     int nForwardCursor = 0;
    
34.     int nTrailingCursor = 0;
    
35.     int bTrim = 1;
    
36.     for ( nForwardCursor=strlen(pszString)-1;
    
37.             nForwardCursor >= 0 && isspace( pszString[nForwardCursor] );
    
38.             nForwardCursor-- )
    
39.     {
    
40.     }
    
41.     pszString[nForwardCursor+1] = '\0';
    
42.     return SUCCESS;
    
43. }
    
44. 
    
45. /* TRIM LEFT & RIGHT */
    
46. int trim(char *str)
    
47. {
    
48.     ltrim(str);
    
49.     rtrim(str);
    
50.     return SUCCESS;
    
51. }

测试代码如下：
file: test.c

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1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. #include <string.h>
   
4. #include <ctype.h>
   
5. 
   
6. int main( void )
   
7. {
   
8.     char    s[80];
   
9.     sprintf(s,"%s"," aaaaaa ");
   
10.     printf("=== strlen = %d === \n",strlen(s));
    
11.     trim(s);
    
12.     printf("=== len = %d ===\n",strlen(s));
    
13.     return 0;
    
14. }

编译：
cc -o test test.c trim.c

运行：
$ ./test