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#include "internal.h"
#include <stdio.h>
#include <mntent.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <fstab.h>
static const char df_usage[] = "df [filesystem ...]\n"
"\n"
"\tPrint the filesystem space used and space available.\n";
static int
df(char* device, const char * mountPoint)
{
struct statfs s;
long blocks_used;
long blocks_percent_used;
if ( statfs(mountPoint, &s) != 0 ) {
perror(mountPoint);
return 1;
}
if ( s.f_blocks > 0 ) {
blocks_used = s.f_blocks - s.f_bfree;
blocks_percent_used = (long)
(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
if ( strcmp(device, "/dev/root")==0)
device=(getfsfile ("/"))->fs_spec;
printf(
"%-20s %9ld %9ld %9ld %3ld%% %s\n",
device,
(long)(s.f_blocks * (s.f_bsize / 1024.0)),
(long)((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
(long)(s.f_bavail * (s.f_bsize / 1024.0)),
blocks_percent_used,
mountPoint);
}
return 0;
}
/*
* Given a block device, find the mount table entry if that block device
* is mounted.
*
* Given any other file (or directory), find the mount table entry for its
* filesystem.
*/
extern struct mntent *
findMountPoint(const char* name, const char* table)
{
struct stat s;
dev_t mountDevice;
FILE * mountTable;
struct mntent * mountEntry;
if ( stat(name, &s) != 0 )
return 0;
if ( (s.st_mode & S_IFMT) == S_IFBLK )
mountDevice = s.st_rdev;
else
mountDevice = s.st_dev;
if ( (mountTable = setmntent(table, "r")) == 0 )
return 0;
while ( (mountEntry = getmntent(mountTable)) != 0 ) {
if ( strcmp(name, mountEntry->mnt_dir) == 0
|| strcmp(name, mountEntry->mnt_fsname) == 0 ) /* String match. */
break;
if ( stat(mountEntry->mnt_fsname, &s) == 0
&& s.st_rdev == mountDevice ) /* Match the device. */
break;
if ( stat(mountEntry->mnt_dir, &s) == 0
&& s.st_dev == mountDevice ) /* Match the directory's mount point. */
break;
}
endmntent(mountTable);
return mountEntry;
}
extern int
df_main(int argc, char * * argv)
{
printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
"1k-blocks", "Used", "Available", "Use%", "Mounted on");
if ( argc > 1 ) {
struct mntent* mountEntry;
int status;
while ( argc > 1 ) {
if ( (mountEntry = findMountPoint(argv[1], "/proc/mounts")) == 0 )
{
fprintf(stderr, "%s: can't find mount point.\n" ,argv[1]);
return 1;
}
status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
if ( status != 0 )
return status;
argc--;
argv++;
}
return 0;
}
else {
FILE * mountTable;
struct mntent * mountEntry;
mountTable = setmntent("/proc/mounts", "r");
if ( mountTable == 0) {
perror("/proc/mounts");
exit( FALSE);
}
while ( (mountEntry = getmntent (mountTable))) {
int status=df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
if (status)
return status;
}
endmntent(mountTable);
}
return 0;
}
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