Function create_fullname

src/pinky.c:112–150

   this function.  */

static char *
create_fullname (char const *gecos_name, char const *user_name)
{
  idx_t rsize = strlen (gecos_name) + 1;
  idx_t ampersands = count_ampersands (gecos_name);

  if (ampersands != 0)
    {
      idx_t ulen = strlen (user_name);
      ptrdiff_t product;
      if (ckd_mul (&product, ulen - 1, ampersands)
          || ckd_add (&rsize, rsize, product))
        xalloc_die ();
    }

  char *result = xmalloc (rsize);
  char *r = result;

  while (*gecos_name)
    {
      if (*gecos_name == '&')
        {
          char const *uname = user_name;
          if (islower (to_uchar (*uname)))
            *r++ = toupper (to_uchar (*uname++));
          while (*uname)
            *r++ = *uname++;
        }
      else
        {
          *r++ = *gecos_name;
        }

      gecos_name++;
    }
  *r = 0;

  return result;
}

/* Return a string representing the time between WHEN and the time
   that this function is first run. */