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/* df.c - report free disk space.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/df.html
USE_DF(NEWTOY(df, "HPkhit*a[-HPh]", TOYFLAG_SBIN))
config DF
bool "df"
default y
help
usage: df [-HPkhi] [-t type] [FILE...]
The "disk free" command shows total/used/available disk space for
each filesystem listed on the command line, or all currently mounted
filesystems.
-a Show all (including /proc and friends)
-P The SUSv3 "Pedantic" option
-k Sets units back to 1024 bytes (the default without -P)
-h Human readable (K=1024)
-H Human readable (k=1000)
-i Show inodes instead of blocks
-t type Display only filesystems of this type
Pedantic provides a slightly less useful output format dictated by POSIX,
and sets the units to 512 bytes instead of the default 1024 bytes.
*/
#define FOR_df
#include "toys.h"
GLOBALS(
struct arg_list *t;
int units, width[6];
)
static void measure_columns(char *s[])
{
int i;
for (i = 0; i<5; i++) TT.width[i] = maxof(TT.width[i], strlen(s[i]));
}
static void print_columns(char **dsuapm)
{
int i;
for (i = 0; i<6; i++) printf(!i ? "%-*s" : " %*s", TT.width[i], dsuapm[i]);
xputc('\n');
}
static void print_header()
{
char *dsuapm[] = {"Filesystem", "Size", "Used", "Avail", "Use%","Mounted on"};
// The filesystem column is always at least this wide.
TT.width[0] = maxof(TT.width[0], 14+(FLAG(H)||FLAG(h)));
if (FLAG(i)) memcpy(dsuapm+1, (char *[]){"Inodes", "IUsed", "IFree", "IUse%"},
sizeof(char *)*4);
else {
if (!(FLAG(H)||FLAG(h))) {
dsuapm[1] = TT.units == 512 ? "512-blocks" :
FLAG(P) ? "1024-blocks" : "1K-blocks";
dsuapm[3] = "Available";
if (FLAG(P)) dsuapm[4] = "Capacity";
}
}
measure_columns(dsuapm);
TT.width[5] = -1;
print_columns(dsuapm);
}
static void show_mt(struct mtab_list *mt, int measuring)
{
unsigned long long suap[4], block = 1, ll;
char *dsuapm[6]; // device, size, used, avail, percent, mount
int i;
// If we don't have -a, skip overmounted and synthetic filesystems.
if (!mt || (!FLAG(a) && (!mt->stat.st_dev || !mt->statvfs.f_blocks))) return;
// If we have -t, skip other filesystem types
if (TT.t) {
struct arg_list *al;
for (al = TT.t; al; al = al->next) if (!strcmp(mt->type, al->arg)) break;
if (!al) return;
}
// Prepare filesystem display fields
*dsuapm = *mt->device == '/' ? xabspath(mt->device, 0) : 0;
if (!*dsuapm) *dsuapm = mt->device;
if (!mt->stat.st_dev) for (i = 1; i<5; i++) dsuapm[i] = "-";
else {
if (FLAG(i)) {
suap[0] = mt->statvfs.f_files;
suap[1] = mt->statvfs.f_files - mt->statvfs.f_ffree;
suap[2] = getuid() ? mt->statvfs.f_favail : mt->statvfs.f_ffree;
} else {
block = maxof(mt->statvfs.f_frsize, 1);
suap[0] = mt->statvfs.f_blocks;
suap[1] = mt->statvfs.f_blocks - mt->statvfs.f_bfree;
suap[2] = getuid() ? mt->statvfs.f_bavail : mt->statvfs.f_bfree;
}
// Scale and convert to strings
dsuapm[1] = toybuf;
for (i = 0; i<3; i++) {
suap[i] = (block*suap[i])/TT.units;
if (FLAG(H)||FLAG(h))
human_readable(dsuapm[i+1], suap[i], FLAG(H) ? HR_1000 : 0);
else sprintf(dsuapm[i+1], "%llu", suap[i]);
dsuapm[i+2] = strchr(dsuapm[i+1], 0)+1;
}
// percent
if ((suap[3] = ll = suap[1]+suap[2])) {
suap[3] = (block = suap[1]*100)/ll;
if (block != suap[3]*ll) suap[3]++;
}
sprintf(dsuapm[4], "%llu%%", suap[3]);
}
dsuapm[5] = mt->dir;
if (measuring) measure_columns(dsuapm);
else print_columns(dsuapm);
if (*dsuapm != mt->device) free(*dsuapm);
}
void df_main(void)
{
struct mtab_list *mt, *mtstart, *mtend, *mt2, *mt3;
int measuring;
char **next;
// Units are 512 bytes if you select "pedantic" without "kilobytes".
if (FLAG(H)||FLAG(h)||FLAG(i)) TT.units = 1;
else TT.units = FLAG(P) && !FLAG(k) ? 512 : 1024;
if (!(mtstart = xgetmountlist(0))) return;
mtend = dlist_terminate(mtstart);
// If we have a list of filesystems on the command line, loop through them.
if (*toys.optargs) {
// Measure the names then output the table.
for (measuring = 1;;) {
for (next = toys.optargs; *next; next++) {
struct stat st;
// Stat it (complain if we can't).
if (stat(*next, &st)) {
if (!measuring) perror_msg("'%s'", *next);
} else {
// Find and display this filesystem. Use _last_ hit in case of
// overmounts (which is first hit in the reversed list).
for (mt = mtend, mt2 = 0; mt; mt = mt->prev) {
if (!mt2 && st.st_dev == mt->stat.st_dev) mt2 = mt;
if (st.st_rdev && (st.st_rdev == mt->stat.st_dev)) break;
}
show_mt(mt ? : mt2, measuring);
}
}
if (!measuring--) break;
print_header();
}
} else {
// Loop through mount list to filter out overmounts.
for (mt = mtend; mt; mt = mt->prev) {
for (mt3 = mt, mt2 = mt->prev; mt2; mt2 = mt2->prev) {
if (mt->stat.st_dev == mt2->stat.st_dev) {
// For --bind mounts, show earliest mount
if (!strcmp(mt->device, mt2->device)) {
mt3->stat.st_dev = 0;
mt3 = mt2;
} else mt2->stat.st_dev = 0;
}
}
}
// Measure the names then output the table (in filesystem creation order).
for (measuring = 1;;) {
for (mt = mtstart; mt; mt = mt->next) show_mt(mt, measuring);
if (!measuring--) break;
print_header();
}
}
if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free);
}
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