df.c

   1 #include "internal.h"
   2 #include <stdio.h>
   3 #include <mntent.h>
   4 #include <sys/stat.h>
   5 #include <sys/vfs.h>
   6
   7 const char      df_usage[] = "df [filesystem ...]\n"
   8 "\n"
   9 "\tPrint the filesystem space used and space available.\n";
  10
  11
  12 static int
  13 df(const char * device, const char * mountPoint)
  14 {
  15         struct statfs   s;
  16         long            blocks_used;
  17         long            blocks_percent_used;
  18
  19         if ( statfs(mountPoint, &s) != 0 ) {
  20                 name_and_error(mountPoint);
  21                 return 1;
  22         }
  23
  24         if ( s.f_blocks > 0 ) {
  25                 blocks_used = s.f_blocks - s.f_bfree;
  26                 blocks_percent_used = (long)
  27                  (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
  28
  29 /*
  30                 printf(
  31                  "%-20s %7ld %7ld  %7ld  %5ld%%   %s\n"
  32                 ,device
  33                 ,s.f_blocks
  34                 ,s.f_blocks - s.f_bfree
  35                 ,s.f_bavail
  36                 ,blocks_percent_used
  37                 ,mountPoint);
  38 */
  39
  40                 printf(
  41                        "%-20s %7.0f %7.0f  %7.0f  %5ld%%   %s\n"
  42                        ,device
  43                        ,s.f_blocks * (s.f_bsize / 1024.0)
  44                        ,(s.f_blocks - s.f_bfree)  * (s.f_bsize / 1024.0)
  45                        ,s.f_bavail * (s.f_bsize / 1024.0)
  46                        ,blocks_percent_used
  47                        ,mountPoint);
  48
  49         }
  50
  51         return 0;
  52 }
  53
  54 extern int
  55 df_main(struct FileInfo * i, int argc, char * * argv)
  56 {
  57         static const char header[] =
  58          "Filesystem         1024-blocks  Used Available Capacity Mounted on\n";
  59         printf(header);
  60
  61         if ( argc > 1 ) {
  62                 struct mntent * mountEntry;
  63                 int                             status;
  64
  65                 while ( argc > 1 ) {
  66                         if ( (mountEntry = findMountPoint(argv[1], "/etc/mtab")) == 0
  67                          && (mountEntry = findMountPoint(argv[1], "/proc/mounts")) == 0 )
  68                         {
  69                                 fprintf(stderr, "%s: can't find mount point.\n"
  70                                 ,argv[1]);
  71                                 return 1;
  72                         }
  73                         status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
  74                         if ( status != 0 )
  75                                 return status;
  76                         argc--;
  77                         argv++;
  78                 }
  79                 return 0;
  80         }
  81         else {
  82                 FILE *          mountTable;
  83                 struct mntent * mountEntry;
  84
  85                 if ( (mountTable = setmntent("/etc/mtab", "r")) == 0
  86                  && (mountTable = setmntent("/proc/mounts", "r")) == 0
  87                 ) {
  88                         name_and_error("/etc/mtab");
  89                         return 1;
  90                 }
  91
  92                 while ( (mountEntry = getmntent(mountTable)) != 0 ) {
  93                         int status = df(
  94                          mountEntry->mnt_fsname
  95                         ,mountEntry->mnt_dir);
  96                         if ( status != 0 )
  97                                 return status;
  98                 }
  99                 endmntent(mountTable);
 100         }
 101
 102         return 0;
 103 }