1 #include <stdio.h>
 2 #define TABINC 8
 3 
 4 main()
 5 {
 6     int c, nb, nt, pos;
 7     nb = 0;
 8     nt = 0;
 9     for(pos = 1; (c = getchar()) != EOF; ++pos)
10         if(c == ' ')
11         {
12             if(pos % TABINC != 0)
13                     ++nb;
14             else
15             {
16                 nb = 0;
17                 ++nt;
18                }
19         }
20         else
21         {
22             for( ; nt > 0; --nt)
23                 putchar('\t');
24             if(c == '\t')
25                    nb = 0;
26             else
27                 for( ; nb > 0; --nb)
28                     putchar(' ');
29                     putchar(c);
30                 if(c == '\n')
31                     pos = 0;
32                 else if (c == '\t')
33                     pos = pos + (TABINC - (pos - 1) % TABINC) - 1;
34         }
35 }