Files
2024-02-19 00:21:55 -05:00

105 lines
2.6 KiB
C

/* df.c: Copywrite (92) Peter MacDonald: distribute freely, don't restrict. */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <linux/fs.h>
char *hdr1="\n inodes inodes inodes blocks blocks blocks mount";
char *hdr2= "device total used free total used free point";
char *hdr3= "--------------------------------------------------------------------";
char *fmt = "%-9s %-7d %-7d %-7d %-7d %-7d %-7d %s\n";
void do_df(char *dev, char *dir);
int main(int argc, char *argv[])
{ int i;
sync();
puts(hdr1);
puts(hdr2);
puts(hdr3);
if (argc != 1)
for (i=1; i<argc; i++)
do_df(argv[i],"");
else
{ FILE *F = fopen("/etc/mtab","r");
if (!F)
{ fprintf(stderr,"/etc/mtab not found\n");
exit(1);
}
do
{ char buf[200], dev[40], dir[150];
fgets(buf,200,F);
if (feof(F) || (strlen(buf)<6))
break;
sscanf(buf,"%s %s",dev,dir);
do_df(dev,dir);
} while (1);
}
exit(0);
}
#define oops(str,arg) { fprintf(stderr,str,arg); close(fd); return; }
int fd;
int nibblemap[] = { 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4 };
ino_t count(unsigned numblocks, unsigned numbits)
{ unsigned i, j, end, sum = 0;
char buf[BLOCK_SIZE];
for (i=0; (i<numblocks) && numbits; i++)
{
if (read(fd,buf,sizeof(buf))<0)
return(0);
if (numbits >= (8*BLOCK_SIZE))
{
end = BLOCK_SIZE;
numbits -= 8*BLOCK_SIZE;
}
else
{ int tmp;
end = numbits >> 3;
numbits &= 0x7;
tmp = buf[end] & ((1<<numbits)-1);
sum += nibblemap[tmp&0xf] + nibblemap[(tmp>>4)&0xf];
numbits = 0;
}
for (j=0; j<end; j++)
sum += nibblemap[buf[j] & 0xf] + nibblemap[(buf[j]>>4)&0xf];
}
return(sum);
}
void do_df(char *dev, char *dir)
{ int it,iu,bt,bu;
struct super_block supstruct;
if ((fd=open(dev,O_RDONLY))<0)
oops("df can't open device: %s",dev);
lseek(fd,BLOCK_SIZE,SEEK_SET);
if (read(fd,(char*)&supstruct,sizeof(struct super_block))
!= sizeof(struct super_block))
oops("super block unreadable: %s",dev);
lseek(fd,BLOCK_SIZE*2,SEEK_SET);
if (supstruct.s_magic != SUPER_MAGIC)
oops("not a valid file system: %s",dev);
it = supstruct.s_ninodes;
iu = count(supstruct.s_imap_blocks,supstruct.s_ninodes+1);
bt = supstruct.s_nzones << supstruct.s_log_zone_size;
bu = count(supstruct.s_zmap_blocks,supstruct.s_nzones) <<
supstruct.s_log_zone_size;
printf(fmt,dev,it,iu,it-iu,bt,bu,bt-bu,dir);
}