Remove extra white space from inside a C string?

Question

I have read a few lines of text into an array of C-strings. The lines have an arbitrary number of tab or space-delimited columns, and I am trying to figure out how to remove

Answer 1

I made a small improvment over John Bode's to remove trailing whitespace as well:

#include 

char *squeeze(char *str)
{
  char* r; /* next character to be read */
  char* w; /* next character to be written */
  char c;
  int sp, sp_old = 0;

  r=w=str;

  do {
    c=*r;
    sp = isspace(c);
    if (!sp) {
      if (sp_old && c) {
        // don't add a space at end of string
        *w++ = ' ';
      }
      *w++ = c;
    }
    if (str < w) {
      // don't add space at start of line
      sp_old = sp;
    }
    r++;
  }
  while (c);

  return str;
}

#include 

int main(void)
{
  char test[] = "\t\nThis\nis\ta\f     test.\n\t\n";
  //printf("test = %s\n", test);
  printf("squeeze(test) = '%s'\n", squeeze(test));
  return 0;
}

br.