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annotate toys/df.c @ 156:1e8f4b05cb65

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Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment tweaks.
author Rob Landley <rob@landley.net>
date Thu, 15 Nov 2007 18:30:30 -0600
parents 7c77c6ec17ee
children c79290b54bd3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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1 /* vi: set sw=4 ts=4: */
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2 /*
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3 * df.c - report free disk space.
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4 *
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5 * Implemented roughly according to SUSv3:
2
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6 * http://www.opengroup.org/onlinepubs/009695399/utilities/df.html
156
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7 *
2
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8 * usage: df [-k] [-P|-t] [file...]
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9 */
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10
1
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11 #include "toys.h"
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12
7
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13 static void show_mt(struct mtab_list *mt)
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14 {
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15 int len;
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16 long size, used, avail, percent;
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17 uint64_t block;
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18
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19 // Return if it wasn't found (should never happen, but with /etc/mtab...)
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20 if (!mt) return;
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21
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22 // If we have -t, skip other filesystem types
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23 if (toy.df.fstype) {
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24 struct arg_list *al;
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32
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26 for (al = toy.df.fstype; al; al = al->next) {
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27 if (!strcmp(mt->type, al->arg)) break;
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28 }
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29 if (!al) return;
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30 }
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31
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32 // If we don't have -a, skip synthetic filesystems
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33 if (!(toys.optflags & 1) && !mt->statvfs.f_blocks) return;
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34
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35 // Figure out how much total/used/free space this filesystem has,
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36 // forcing 64-bit math because filesystems are big now.
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37 block = mt->statvfs.f_bsize ? : 1;
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38 size = (long)((block * mt->statvfs.f_blocks) / toy.df.units);
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39 used = (long)((block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree))
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40 / toy.df.units);
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41 avail = (long)((block
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42 * (getuid() ? mt->statvfs.f_bavail : mt->statvfs.f_bfree))
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43 / toy.df.units);
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44 percent = size ? 100-(long)((100*(uint64_t)avail)/size) : 0;
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45
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46 // Figure out appropriate spacing
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47 len = 25 - strlen(mt->device);
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48 if (len < 1) len = 1;
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49 if (CFG_DF_PEDANTIC && (toys.optflags & 8)) {
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50 printf("%s %ld %ld %ld %ld%% %s\n", mt->device, size, used, avail,
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51 percent, mt->dir);
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52 } else {
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53 printf("%s% *ld % 10ld % 9ld % 3ld%% %s\n",mt->device, len,
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54 size, used, avail, percent, mt->dir);
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55 }
7
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56 }
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57
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58 int df_main(void)
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59 {
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60 struct mtab_list *mt, *mt2, *mtlist;
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61
7
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62 // Handle -P and -k
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63 toy.df.units = 1024;
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64 if (CFG_DF_PEDANTIC && (toys.optflags & 8)) {
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65 // Units are 512 bytes if you select "pedantic" without "kilobytes".
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66 if ((toys.optflags&3) == 1) toy.df.units = 512;
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67 printf("Filesystem %ld-blocks Used Available Capacity Mounted on\n",
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68 toy.df.units);
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69 } else puts("Filesystem\t1K-blocks\tUsed Available Use% Mounted on");
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70
2
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71 mtlist = getmountlist(1);
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72
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73 // If we have a list of filesystems on the command line, loop through them.
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74 if (*toys.optargs) {
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75 char **next;
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76
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77 for(next = toys.optargs; *next; next++) {
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78 struct stat st;
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79
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80 // Stat it (complain if we can't).
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81 if(stat(*next, &st)) {
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82 perror_msg("`%s'", next);
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83 toys.exitval = 1;
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84 continue;
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85 }
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86
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87 // Find and display this filesystem. Use _last_ hit in case of
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88 // -- bind mounts.
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89 mt2 = NULL;
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90 for (mt = mtlist; mt; mt = mt->next)
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91 if (st.st_dev == mt->stat.st_dev) mt2 = mt;
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92 show_mt(mt2);
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93 }
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94 } else {
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95 // Get and loop through mount list.
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96
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97 for (mt = mtlist; mt; mt = mt->next) {
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98 struct mtab_list *mt2, *mt3;
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99
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100 if (!mt->stat.st_dev) continue;
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101
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102 // Filter out overmounts.
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103 mt3 = mt;
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104 for (mt2 = mt->next; mt2; mt2 = mt2->next) {
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105 if (mt->stat.st_dev == mt2->stat.st_dev) {
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106 // For --bind mounts, take last match
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107 if (!strcmp(mt->device, mt2->device)) mt3 = mt2;
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108 // Filter out overmounts
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109 mt2->stat.st_dev = 0;
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110 }
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111 }
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112 show_mt(mt3);
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113 }
2
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114 }
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115
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116 if (CFG_TOYBOX_FREE) llist_free(mtlist, NULL);
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117
2
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118 return 0;
1
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119 }