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annotate lib/getmountlist.c @ 1460:94f7ec50ef50 draft

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Debugging pass on mount. Not quite done yet, but the basics seem to work now.
author Rob Landley <rob@landley.net>
date Sun, 07 Sep 2014 14:42:51 -0500
parents 487716951287
children 321e9d5032c1
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rev   line source
7
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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1 /* getmountlist.c - Get a linked list of mount points, with stat information.
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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2 *
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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3 * Copyright 2006 Rob Landley <rob@landley.net>
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4 */
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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5
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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6 #include "toys.h"
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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7 #include <mntent.h>
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8
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9 // Realloc *old with oldstring,newstring
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10
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11 void comma_collate(char **old, char *new)
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12 {
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13 char *temp, *atold = *old;
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14
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15 // Only add a comma if old string didn't end with one
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16 if (atold && *atold) {
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17 char *comma = ",";
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18
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19 if (atold[strlen(atold)-1] == ',') comma = "";
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20 temp = xmprintf("%s%s%s", atold, comma, new);
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21 } else temp = xstrdup(new);
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22 free (atold);
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23 *old = temp;
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24 }
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25
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26 // iterate through strings in a comma separated list.
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27 // returns start of next entry or NULL if none
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28 // sets *len to length of entry (not including comma)
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29 // advances *list to start of next entry
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30 char *comma_iterate(char **list, int *len)
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31 {
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32 char *start = *list, *end;
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33
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34 if (!*list || !**list) return 0;
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35
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36 if (!(end = strchr(*list, ','))) {
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37 *len = strlen(*list);
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38 *list = 0;
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39 } else *list += (*len = end-start)+1;
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40
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41 return start;
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42 }
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43
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44 static void deslash(char *s)
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45 {
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46 char *o = s;
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47
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48 while (*s) {
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49 if (*s == '\\') {
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50 int i, oct = 0;
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51
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52 for (i = 1; i < 4; i++) {
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53 if (!isdigit(s[i])) break;
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54 oct = (oct<<3)+s[i]-'0';
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55 }
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56 if (i == 4) {
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57 *o++ = oct;
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58 s += i;
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59 continue;
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60 }
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61 }
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62 *o++ = *s++;
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63 }
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64
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65 *o = 0;
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66 }
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67
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68 // check all instances of opt and "no"opt in optlist, return true if opt
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69 // found and last instance wasn't no. If clean, remove each instance from list.
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70 int comma_scan(char *optlist, char *opt, int clean)
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71 {
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72 int optlen = strlen(opt), len, no, got = 0;
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73
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74 if (optlist) for (;;) {
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75 char *s = comma_iterate(&optlist, &len);
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76
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77 if (!s) break;
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78 no = 2*(*s == 'n' && s[1] == 'o');
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79 if (optlen == len+no && !strcmp(opt, s+no)) {
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80 got = !no;
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81 if (clean) memmove(s, optlist, strlen(optlist)+1);
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82 }
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83 }
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84
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85 return got;
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86 }
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87
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88 // return true if all scanlist options enabled in optlist
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89 int comma_scanall(char *optlist, char *scanlist)
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90 {
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91 int i = 1;
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92
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93 for (;;) {
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94 char *opt = comma_iterate(&scanlist, &i), *s = xstrndup(opt, i);
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95
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96 i = comma_scan(optlist, s, 0);
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97 free(s);
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98 if (!i) break;
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99 }
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100
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101 return i;
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102 }
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103
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104 // Check if this type matches list.
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105 // Odd syntax: typelist all yes = if any, typelist all no = if none.
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106
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107 int mountlist_istype(struct mtab_list *ml, char *typelist)
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108 {
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109 int len, skip;
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110 char *t;
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111
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112 if (!typelist) return 1;
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113
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114 skip = strncmp(typelist, "no", 2);
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115
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116 for (;;) {
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117 if (!(t = comma_iterate(&typelist, &len))) break;
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118 if (!skip) {
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119 // If one -t starts with "no", the rest must too
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120 if (strncmp(t, "no", 2)) error_exit("bad typelist");
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121 if (!strncmp(t+2, ml->type, len-2)) {
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122 skip = 1;
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123 break;
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124 }
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125 } else if (!strncmp(t, ml->type, len) && !ml->type[len]) {
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126 skip = 0;
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127 break;
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128 }
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129 }
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130
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131 return !skip;
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132 }
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133
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134 // Get list of mounted filesystems, including stat and statvfs info.
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135 // Returns a reversed list, which is good for finding overmounts and such.
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136
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137 struct mtab_list *xgetmountlist(char *path)
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138 {
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139 struct mtab_list *mtlist = 0, *mt;
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140 struct mntent *me;
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141 FILE *fp;
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142 char *p = path ? path : "/proc/mounts";
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143
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144 if (!(fp = setmntent(p, "r"))) perror_exit("bad %s", p);
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145
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146 // The "test" part of the loop is done before the first time through and
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147 // again after each "increment", so putting the actual load there avoids
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148 // duplicating it. If the load was NULL, the loop stops.
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149
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150 while ((me = getmntent(fp))) {
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151 mt = xzalloc(sizeof(struct mtab_list) + strlen(me->mnt_fsname) +
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152 strlen(me->mnt_dir) + strlen(me->mnt_type) + strlen(me->mnt_opts) + 4);
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153 dlist_add_nomalloc((void *)&mtlist, (void *)mt);
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154
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155 // Collect details about mounted filesystem
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156 // Don't report errors, just leave data zeroed
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157 if (!path) {
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158 stat(me->mnt_dir, &(mt->stat));
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159 statvfs(me->mnt_dir, &(mt->statvfs));
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160 }
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161
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162 // Remember information from /proc/mounts
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163 mt->dir = stpcpy(mt->type, me->mnt_type)+1;
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164 mt->device = stpcpy(mt->dir, me->mnt_dir)+1;
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165 mt->opts = stpcpy(mt->device, me->mnt_fsname)+1;
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166 strcpy(mt->opts, me->mnt_opts);
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167
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168 deslash(mt->dir);
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169 deslash(mt->device);
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170 }
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171 endmntent(fp);
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172
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173 return mtlist;
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174 }