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/* disk free space checking, C mini-library
*
* Copyright 2012, 2014 Joey Hess <id@joeyh.name>
*
* License: BSD-2-clause
*/
/* Include appropriate headers for the OS, and define what will be used to
* check the free space. */
#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
# define BSIZE f_bsize
#else
#if defined __ANDROID__
# warning free space checking code not available for Android
# define UNKNOWN
#else
#if defined (__linux__) || defined (__APPLE__) || defined (__FreeBSD_kernel__) || (defined (__SVR4) && defined (__sun))
/* Linux or OSX or Debian kFreeBSD or Solaris */
/* This is a POSIX standard, so might also work elsewhere too. */
# include <sys/statvfs.h>
# define STATCALL statvfs
# define STATSTRUCT statvfs
# define BSIZE f_frsize
#else
# warning free space checking code not available for this OS
# define UNKNOWN
#endif
#endif
#endif
#include <errno.h>
#include <stdio.h>
unsigned long long int get(const char *path, int req) {
#ifdef UNKNOWN
errno = 1;
return 0;
#else
unsigned long long int v, blocksize;
struct STATSTRUCT buf;
if (STATCALL(path, &buf) != 0)
return 0; /* errno is set */
else
errno = 0;
switch (req) {
case 0:
v = buf.f_blocks;
break;
case 1:
v = buf.f_bavail;
break;
default:
v = 0;
}
blocksize = buf.BSIZE;
return v * blocksize;
#endif
}
/* 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) {
return get(path, 1);
}
/* Gets the total size of the disk. */
unsigned long long int disksize(const char *path) {
return get(path, 0);
}
/*
main () {
printf("%lli\n", diskfree("."));
}
*/
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