add directory bin

bin/df.c

@@ -0,0 +1,104 @@
+/* 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);
+}
+