#include <bits/types.h>

/* In Linux, size_t is always unsigned while off_t is always *signed*.

This *will* trigger strict signed-unsigned checks in a way that *cannot*

be avoided any time size in memory is compared to size on disk.

Ad-hoc casts to fix the warnings will only make the situation worse:

32 < 63 on 32-bit arches but 64 > 63 on 64-bit arches.

The following is a reasonably safe way to avoid signed-unsigned compare

warnings. It will not help with assignments however, those must be handled

*very* carefully.

The proper way to fix this is to make file sizes unsigned and change seek

modes to { SEEK_SET, SEEK_FWD, SEEK_REV, SEEK_END }, all taking unsigned

offsets. Too bad the wrong decision is already burned into the syscall

interface.

Return: -1 if msz < fsz, +1 if msz > fsz. */

inline static int mem_off_cmp(size_t msz, off_t fsz)

{

if(fsz < 0)

return 1;

#if BITS == 32 /* sizeof(msz) < sizeof(fsz) */

off_t smsz = (off_t)msz;

if(smsz < fsz)

return -1;

if(smsz > fsz)

return 1;

#else /* sizeof(msz) == sizeof(fsz) */

size_t ufsz = (size_t)fsz;

if(msz < ufsz)

return -1;

if(msz > ufsz)

return 1;

#endif

return 0;

}