annotate toys/df.c @ 624:1e8b9acdafeb

Genericize llist code a bit: rename llist_free() to llist_traverse(), and no longer accept NULL as a synonym for free.
author Rob Landley <rob@landley.net>
date Sun, 15 Jul 2012 17:22:04 -0500
parents 979c5ab6f0c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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233
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1 /* vi: set sw=4 ts=4:
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2 *
2
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3 * df.c - report free disk space.
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4 *
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5 * Copyright 2006 Rob Landley <rob@landley.net>
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6 *
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7 * See http://www.opengroup.org/onlinepubs/009695399/utilities/df.html
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8
234
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9 USE_DF(NEWTOY(df, "Pkt*a", TOYFLAG_USR|TOYFLAG_SBIN))
163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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10
233
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11 config DF
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12 bool "df (disk free)"
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13 default y
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14 help
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15 usage: df [-t type] [FILESYSTEM ...]
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16
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17 The "disk free" command, df shows total/used/available disk space for
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18 each filesystem listed on the command line, or all currently mounted
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19 filesystems.
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20
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21 -t type
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22 Display only filesystems of this type.
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23
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24 config DF_PEDANTIC
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25 bool "options -P and -k"
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26 default y
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27 depends on DF
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28 help
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29 usage: df [-Pk]
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30
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31 -P The SUSv3 "Pedantic" option
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32
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33 Provides a slightly less useful output format dictated by
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34 the Single Unix Specification version 3, and sets the
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35 units to 512 bytes instead of the default 1024 bytes.
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36
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37 -k Sets units back to 1024 bytes (the default without -P)
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38 */
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39
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40 #include "toys.h"
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41
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42 DEFINE_GLOBALS(
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43 struct arg_list *fstype;
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44
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45 long units;
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46 )
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47
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48 #define TT this.df
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49
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50 static void show_mt(struct mtab_list *mt)
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51 {
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52 int len;
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53 long size, used, avail, percent;
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54 uint64_t block;
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55
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56 // Return if it wasn't found (should never happen, but with /etc/mtab...)
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57 if (!mt) return;
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58
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59 // If we have -t, skip other filesystem types
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60 if (TT.fstype) {
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61 struct arg_list *al;
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62
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63 for (al = TT.fstype; al; al = al->next) {
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64 if (!strcmp(mt->type, al->arg)) break;
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65 }
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66 if (!al) return;
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67 }
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68
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69 // If we don't have -a, skip synthetic filesystems
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70 if (!(toys.optflags & 1) && !mt->statvfs.f_blocks) return;
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71
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72 // Figure out how much total/used/free space this filesystem has,
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73 // forcing 64-bit math because filesystems are big now.
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74 block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1;
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75 size = (long)((block * mt->statvfs.f_blocks) / TT.units);
7
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76 used = (long)((block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree))
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77 / TT.units);
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78 avail = (long)((block
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79 * (getuid() ? mt->statvfs.f_bavail : mt->statvfs.f_bfree))
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80 / TT.units);
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81 percent = size ? 100-(long)((100*(uint64_t)avail)/size) : 0;
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82
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83 // Figure out appropriate spacing
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84 len = 25 - strlen(mt->device);
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85 if (len < 1) len = 1;
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86 if (CFG_DF_PEDANTIC && (toys.optflags & 8)) {
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87 printf("%s %ld %ld %ld %ld%% %s\n", mt->device, size, used, avail,
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88 percent, mt->dir);
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89 } else {
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90 printf("%s% *ld % 10ld % 9ld % 3ld%% %s\n",mt->device, len,
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91 size, used, avail, percent, mt->dir);
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92 }
7
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93 }
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94
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95 void df_main(void)
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96 {
7
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97 struct mtab_list *mt, *mt2, *mtlist;
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98
7
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99 // Handle -P and -k
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100 TT.units = 1024;
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101 if (CFG_DF_PEDANTIC && (toys.optflags & 8)) {
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102 // Units are 512 bytes if you select "pedantic" without "kilobytes".
237
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103 if ((toys.optflags&3) == 1) TT.units = 512;
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104 printf("Filesystem %ld-blocks Used Available Capacity Mounted on\n",
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105 TT.units);
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106 } else puts("Filesystem\t1K-blocks\tUsed Available Use% Mounted on");
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107
2
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108 mtlist = getmountlist(1);
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109
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110 // If we have a list of filesystems on the command line, loop through them.
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111 if (*toys.optargs) {
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112 char **next;
7
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113
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114 for(next = toys.optargs; *next; next++) {
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115 struct stat st;
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116
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117 // Stat it (complain if we can't).
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118 if(stat(*next, &st)) {
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119 perror_msg("`%s'", *next);
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120 toys.exitval = 1;
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121 continue;
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122 }
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123
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124 // Find and display this filesystem. Use _last_ hit in case of
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125 // -- bind mounts.
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126 mt2 = NULL;
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127 for (mt = mtlist; mt; mt = mt->next)
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128 if (st.st_dev == mt->stat.st_dev) mt2 = mt;
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129 show_mt(mt2);
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130 }
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131 } else {
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132 // Get and loop through mount list.
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133
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134 for (mt = mtlist; mt; mt = mt->next) {
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135 struct mtab_list *mt2, *mt3;
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136
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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137 if (!mt->stat.st_dev) continue;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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138
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
landley@driftwood
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139 // Filter out overmounts.
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140 mt3 = mt;
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landley@driftwood
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141 for (mt2 = mt->next; mt2; mt2 = mt2->next) {
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landley@driftwood
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142 if (mt->stat.st_dev == mt2->stat.st_dev) {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
landley@driftwood
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143 // For --bind mounts, take last match
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
landley@driftwood
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144 if (!strcmp(mt->device, mt2->device)) mt3 = mt2;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
landley@driftwood
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145 // Filter out overmounts
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landley@driftwood
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146 mt2->stat.st_dev = 0;
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landley@driftwood
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147 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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148 }
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149 show_mt(mt3);
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150 }
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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151 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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152
624
1e8b9acdafeb Genericize llist code a bit: rename llist_free() to llist_traverse(), and no longer accept NULL as a synonym for free.
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153 if (CFG_TOYBOX_FREE) llist_traverse(mtlist, free);
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
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154 }