Thread: Reading colums with tab spaces

You may want to use fscanf something like this.

Code:

#include <stdio.h>

int main(void)
{
   static const char filename[] = "test.txt";
   FILE *file = fopen(filename, "r");
   if ( file != NULL )
   {
      int  i, net, pins;
      char name[14];

      fscanf(file, "%*[^\n]%*c%*[^\n]%*c"); /* read and discard first 2 lines */

      while ( fscanf(file, "%d\t%13[^\t]\t\t%d", &net, name, &pins) == 3 )
      {
         printf("net = %d, name = \"%s\", pins = %d:\n", net, name, pins);
         for ( i = 0; i < pins; ++i )
         {
            int block, pin;
            if ( fscanf(file, "\t(%d,%d)", &block, &pin) == 2 )
            {
               printf(" %2d - block = %d, pin = %d\n", i, block, pin);
            }
         }
      }
      fclose(file);
   }
   else
   {
      perror(filename);
   }
   return 0;
}

/* my output
net = 0, name = "i_63_", pins = 3:
  0 - block = 0, pin = -1
  1 - block = 180, pin = 0
  2 - block = 226, pin = 0
net = 1, name = "i_50_", pins = 14:
  0 - block = 1, pin = -1
  1 - block = 218, pin = 0
  2 - block = 245, pin = 0
  3 - block = 253, pin = 0
  4 - block = 266, pin = 0
  5 - block = 287, pin = 0
  6 - block = 291, pin = 0
  7 - block = 302, pin = 1
*/

But you could also continue to use sscanf if you messed around with a %n to keep track of where you end up in the line of text.