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/* disk free space checking, C mini-library
*
* Copyright 2012 Joey Hess <joey@kitenet.net>
*
* Licensed under the GNU GPL version 3 or higher.
*/
/* Include appropriate headers for the OS, and define what will be used to
* check the free space. */
#if defined(__APPLE__)
# include <sys/param.h>
# include <sys/mount.h>
/* In newer OSX versions, statfs64 is deprecated, in favor of statfs,
* which is 64 bit only with a build option -- but statfs64 still works,
* and this keeps older OSX also supported. */
# define STATCALL statfs64
# define STATSTRUCT statfs64
#else
#if defined (__FreeBSD__)
# include <sys/param.h>
# include <sys/mount.h>
# define STATCALL statfs /* statfs64 not yet tested on a real FreeBSD machine */
# define STATSTRUCT statfs
#else
#if defined (__linux__) || defined (__FreeBSD_kernel__)
/* Linux or Debian kFreeBSD */
/* This is a POSIX standard, so might also work elsewhere too. */
# include <sys/statvfs.h>
# define STATCALL statvfs
# define STATSTRUCT statvfs
#else
# warning free space checking code not available for this OS
# define UNKNOWN
#endif
#endif
#endif
#include <errno.h>
#include <stdio.h>
/* Checks the amount of disk that is available to regular (non-root) users.
* (If there's an error, or this is not supported,
* returns 0 and sets errno to nonzero.)
*/
unsigned long long int diskfree(const char *path) {
#ifdef UNKNOWN
errno = 1;
return 0;
#else
unsigned long long int available, blocksize;
struct STATSTRUCT buf;
if (STATCALL(path, &buf) != 0)
return 0; /* errno is set */
else
errno = 0;
available = buf.f_bavail;
blocksize = buf.f_bsize;
return available * blocksize;
#endif
}
/*
main () {
printf("%lli\n", diskfree("."));
}
*/
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