#include <stdio.h>

struct _state_flags {
   const char *_name;
   int _mask;
   const char *_descr;
} state_flags[] = {
   {"SLBF",  0x0001, "line buffered"},
   {"SNBF",  0x0002, "unbuffered"},
   {"SRD",   0x0004, "OK to read"},
   {"SWR",   0x0008, "OK to write"},
   {"SRW",   0x0010, "open for reading & writing"},
   {"SEOF",  0x0020, "found EOF"},
   {"SERR",  0x0040, "found error"},
   {"SMBF",  0x0080, "_buf is from malloc"},
   {"SAPP",  0x0100, "fdopen()ed in append mode"},
   {"SSTR",  0x0200, "this is an sprintf/snprintf string"},
   {"SOPT",  0x0400, "do fseek() optimization"},
   {"SNPT",  0x0800, "do not do fseek() optimization"},
   {"SOFF",  0x1000, "set iff _offset is in fact correct"},
   {"SMOD",  0x2000, "true => fgetln modified _p text"},
   {"SALC",  0x4000, "allocate string space dynamically"},
   {"SAFE",  0x8000, "don't call signal-unsafe functions"},
   {NULL, 0, NULL}
};

void print_state_flags(FILE *fp)
{
   struct _state_flags *psf;

   for (psf = state_flags; psf; psf++) {
      if ((psf->_name == NULL)
          && (psf->_mask == 0)
          && (psf->_descr == NULL))
         break;
      printf("%-40s [ %-4s ]: %s\n",
             psf->_descr,
             psf->_name,
             (fp->_flags & psf->_mask) ? "yes" : "no");
   }
}

void print_file_structure(FILE *fp)
{
   printf("current position: %p\n", fp->_p);
   printf("read space: %d\n", fp->_r);
   printf("write space: %d\n", fp->_w);
   printf("current lseek offset: %d\n", fp->_offset);
}