1 /*
2 * This software is licensed under the terms of the MIT License.
3 * See COPYING for further information.
4 * ---
5 * Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
6 * Copyright (c) 2012-2019, Andrei Alexeyev <akari@taisei-project.org>.
7 */
8
9 #include "taisei.h"
10
11 #include "vdir.h"
12
13 #define VDIR_TABLE(vdir) ((ht_str2ptr_t*)((vdir)->data1))
14
vfs_vdir_attach_node(VFSNode * vdir,const char * name,VFSNode * node)15 static void vfs_vdir_attach_node(VFSNode *vdir, const char *name, VFSNode *node) {
16 VFSNode *oldnode = ht_get(VDIR_TABLE(vdir), name, NULL);
17
18 if(oldnode) {
19 vfs_decref(oldnode);
20 }
21
22 ht_set(VDIR_TABLE(vdir), name, node);
23 }
24
vfs_vdir_locate(VFSNode * vdir,const char * path)25 static VFSNode* vfs_vdir_locate(VFSNode *vdir, const char *path) {
26 VFSNode *node;
27 char mutpath[strlen(path)+1];
28 char *primpath, *subpath;
29
30 strcpy(mutpath, path);
31 vfs_path_split_left(mutpath, &primpath, &subpath);
32
33 if((node = ht_get(VDIR_TABLE(vdir), mutpath, NULL))) {
34 return vfs_locate(node, subpath);
35 }
36
37 return NULL;
38 }
39
vfs_vdir_iter(VFSNode * vdir,void ** opaque)40 static const char* vfs_vdir_iter(VFSNode *vdir, void **opaque) {
41 ht_str2ptr_iter_t *iter = *opaque;
42
43 if(!iter) {
44 iter = *opaque = calloc(1, sizeof(*iter));
45 ht_iter_begin(VDIR_TABLE(vdir), iter);
46 } else {
47 ht_iter_next(iter);
48 }
49
50 return iter->has_data ? iter->key : NULL;
51 }
52
vfs_vdir_iter_stop(VFSNode * vdir,void ** opaque)53 static void vfs_vdir_iter_stop(VFSNode *vdir, void **opaque) {
54 if(*opaque) {
55 ht_iter_end((ht_str2ptr_iter_t*)*opaque);
56 free(*opaque);
57 *opaque = NULL;
58 }
59 }
60
vfs_vdir_query(VFSNode * vdir)61 static VFSInfo vfs_vdir_query(VFSNode *vdir) {
62 return (VFSInfo) {
63 .exists = true,
64 .is_dir = true,
65 };
66 }
67
vfs_vdir_free(VFSNode * vdir)68 static void vfs_vdir_free(VFSNode *vdir) {
69 ht_str2ptr_t *ht = VDIR_TABLE(vdir);
70 ht_str2ptr_iter_t iter;
71
72 ht_iter_begin(ht, &iter);
73
74 for(; iter.has_data; ht_iter_next(&iter)) {
75 vfs_decref(iter.value);
76 }
77
78 ht_iter_end(&iter);
79 ht_destroy(ht);
80 free(ht);
81 }
82
vfs_vdir_mount(VFSNode * vdir,const char * mountpoint,VFSNode * subtree)83 static bool vfs_vdir_mount(VFSNode *vdir, const char *mountpoint, VFSNode *subtree) {
84 if(!mountpoint) {
85 vfs_set_error("Virtual directories don't support merging");
86 return false;
87 }
88
89 vfs_vdir_attach_node(vdir, mountpoint, subtree);
90 return true;
91 }
92
vfs_vdir_unmount(VFSNode * vdir,const char * mountpoint)93 static bool vfs_vdir_unmount(VFSNode *vdir, const char *mountpoint) {
94 VFSNode *mountee;
95
96 if(!(mountee = ht_get(VDIR_TABLE(vdir), mountpoint, NULL))) {
97 vfs_set_error("Mountpoint '%s' doesn't exist", mountpoint);
98 return false;
99 }
100
101 ht_unset(VDIR_TABLE(vdir), mountpoint);
102 vfs_decref(mountee);
103 return true;
104 }
105
vfs_vdir_mkdir(VFSNode * node,const char * subdir)106 static bool vfs_vdir_mkdir(VFSNode *node, const char *subdir) {
107 if(!subdir) {
108 vfs_set_error("Virtual directory trying to create itself? How did you even get here?");
109 return false;
110 }
111
112 VFSNode *subnode = vfs_alloc();
113 vfs_vdir_init(subnode);
114 vfs_vdir_mount(node, subdir, subnode);
115
116 return true;
117 }
118
vfs_vdir_repr(VFSNode * node)119 static char* vfs_vdir_repr(VFSNode *node) {
120 return strdup("virtual directory");
121 }
122
123 static VFSNodeFuncs vfs_funcs_vdir = {
124 .repr = vfs_vdir_repr,
125 .query = vfs_vdir_query,
126 .free = vfs_vdir_free,
127 .mount = vfs_vdir_mount,
128 .unmount = vfs_vdir_unmount,
129 .locate = vfs_vdir_locate,
130 .iter = vfs_vdir_iter,
131 .iter_stop = vfs_vdir_iter_stop,
132 .mkdir = vfs_vdir_mkdir,
133 };
134
vfs_vdir_init(VFSNode * node)135 void vfs_vdir_init(VFSNode *node) {
136 node->funcs = &vfs_funcs_vdir;
137 node->data1 = ht_str2ptr_new();
138 }
139