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-rw-r--r--src/bftw.c143
1 files changed, 71 insertions, 72 deletions
diff --git a/src/bftw.c b/src/bftw.c
index 810cd8a..e6b8cd5 100644
--- a/src/bftw.c
+++ b/src/bftw.c
@@ -397,6 +397,10 @@ static void bftw_file_free(struct bftw_cache *cache, struct bftw_file *file) {
* Holds the current state of the bftw() traversal.
*/
struct bftw_state {
+ /** The path(s) to start from. */
+ const char **paths;
+ /** The number of starting paths. */
+ size_t npaths;
/** bftw() callback. */
bftw_callback *callback;
/** bftw() callback data. */
@@ -453,6 +457,8 @@ struct bftw_state {
/** Initialize the bftw() state. */
static int bftw_state_init(struct bftw_state *state, const struct bftw_args *args) {
+ state->paths = args->paths;
+ state->npaths = args->npaths;
state->callback = args->callback;
state->ptr = args->ptr;
state->flags = args->flags;
@@ -1426,45 +1432,52 @@ static int bftw_state_destroy(struct bftw_state *state) {
}
/**
- * bftw() implementation for simple breadth-/depth-first search.
+ * Shared implementation for all search strategies.
*/
-static int bftw_impl(const struct bftw_args *args) {
- struct bftw_state state;
- if (bftw_state_init(&state, args) != 0) {
- return -1;
- }
-
- for (size_t i = 0; i < args->npaths; ++i) {
- if (bftw_visit(&state, args->paths[i]) != 0) {
- goto done;
+static int bftw_impl(struct bftw_state *state) {
+ for (size_t i = 0; i < state->npaths; ++i) {
+ if (bftw_visit(state, state->paths[i]) != 0) {
+ return -1;
}
}
- bftw_batch_finish(&state);
+ bftw_batch_finish(state);
while (true) {
- while (bftw_pop_dir(&state)) {
- if (bftw_opendir(&state) != 0) {
- goto done;
+ while (bftw_pop_dir(state)) {
+ if (bftw_opendir(state) != 0) {
+ return -1;
}
- while (bftw_readdir(&state) > 0) {
- if (bftw_visit(&state, state.de->name) != 0) {
- goto done;
+ while (bftw_readdir(state) > 0) {
+ if (bftw_visit(state, state->de->name) != 0) {
+ return -1;
}
}
- if (bftw_closedir(&state) != 0) {
- goto done;
+ if (bftw_closedir(state) != 0) {
+ return -1;
}
}
- if (!bftw_pop_file(&state)) {
+ if (!bftw_pop_file(state)) {
break;
}
- if (bftw_visit(&state, NULL) != 0) {
+ if (bftw_visit(state, NULL) != 0) {
break;
}
}
-done:
+ return 0;
+}
+
+/**
+ * bftw() implementation for simple breadth-/depth-first search.
+ */
+static int bftw_walk(const struct bftw_args *args) {
+ struct bftw_state state;
+ if (bftw_state_init(&state, args) != 0) {
+ return -1;
+ }
+
+ bftw_impl(&state);
return bftw_state_destroy(&state);
}
@@ -1472,6 +1485,8 @@ done:
* Iterative deepening search state.
*/
struct bftw_ids_state {
+ /** Nested walk state. */
+ struct bftw_state nested;
/** The wrapped callback. */
bftw_callback *delegate;
/** The wrapped callback arguments. */
@@ -1486,12 +1501,8 @@ struct bftw_ids_state {
size_t max_depth;
/** The set of pruned paths. */
struct trie pruned;
- /** An error code to report. */
- int error;
/** Whether the bottom has been found. */
bool bottom;
- /** Whether to quit the search. */
- bool quit;
};
/** Iterative deepening callback function. */
@@ -1535,17 +1546,17 @@ static enum bftw_action bftw_ids_callback(const struct BFTW *ftwbuf, void *ptr)
ret = BFTW_PRUNE;
}
break;
+
case BFTW_PRUNE:
if (ftwbuf->type == BFS_DIR) {
if (!trie_insert_str(&state->pruned, ftwbuf->path)) {
- state->error = errno;
- state->quit = true;
+ state->nested.error = errno;
ret = BFTW_STOP;
}
}
break;
+
case BFTW_STOP:
- state->quit = true;
break;
}
@@ -1553,7 +1564,7 @@ static enum bftw_action bftw_ids_callback(const struct BFTW *ftwbuf, void *ptr)
}
/** Initialize iterative deepening state. */
-static void bftw_ids_init(const struct bftw_args *args, struct bftw_ids_state *state, struct bftw_args *ids_args) {
+static int bftw_ids_init(struct bftw_ids_state *state, const struct bftw_args *args) {
state->delegate = args->callback;
state->ptr = args->ptr;
state->visit = BFTW_PRE;
@@ -1561,30 +1572,19 @@ static void bftw_ids_init(const struct bftw_args *args, struct bftw_ids_state *s
state->min_depth = 0;
state->max_depth = 1;
trie_init(&state->pruned);
- state->error = 0;
state->bottom = false;
- state->quit = false;
- *ids_args = *args;
- ids_args->callback = bftw_ids_callback;
- ids_args->ptr = state;
- ids_args->flags &= ~BFTW_POST_ORDER;
+ struct bftw_args ids_args = *args;
+ ids_args.callback = bftw_ids_callback;
+ ids_args.ptr = state;
+ ids_args.flags &= ~BFTW_POST_ORDER;
+ return bftw_state_init(&state->nested, &ids_args);
}
/** Finish an iterative deepening search. */
-static int bftw_ids_finish(struct bftw_ids_state *state) {
- int ret = 0;
-
- if (state->error) {
- ret = -1;
- } else {
- state->error = errno;
- }
-
+static int bftw_ids_destroy(struct bftw_ids_state *state) {
trie_destroy(&state->pruned);
-
- errno = state->error;
- return ret;
+ return bftw_state_destroy(&state->nested);
}
/**
@@ -1592,15 +1592,15 @@ static int bftw_ids_finish(struct bftw_ids_state *state) {
*/
static int bftw_ids(const struct bftw_args *args) {
struct bftw_ids_state state;
- struct bftw_args ids_args;
- bftw_ids_init(args, &state, &ids_args);
+ if (bftw_ids_init(&state, args) != 0) {
+ return -1;
+ }
- while (!state.quit && !state.bottom) {
+ while (!state.bottom) {
state.bottom = true;
- if (bftw_impl(&ids_args) != 0) {
- state.error = errno;
- state.quit = true;
+ if (bftw_impl(&state.nested) != 0) {
+ goto done;
}
++state.min_depth;
@@ -1611,18 +1611,18 @@ static int bftw_ids(const struct bftw_args *args) {
state.visit = BFTW_POST;
state.force_visit = true;
- while (!state.quit && state.min_depth > 0) {
+ while (state.min_depth > 0) {
--state.max_depth;
--state.min_depth;
- if (bftw_impl(&ids_args) != 0) {
- state.error = errno;
- state.quit = true;
+ if (bftw_impl(&state.nested) != 0) {
+ goto done;
}
}
}
- return bftw_ids_finish(&state);
+done:
+ return bftw_ids_destroy(&state);
}
/**
@@ -1630,39 +1630,38 @@ static int bftw_ids(const struct bftw_args *args) {
*/
static int bftw_eds(const struct bftw_args *args) {
struct bftw_ids_state state;
- struct bftw_args ids_args;
- bftw_ids_init(args, &state, &ids_args);
+ if (bftw_ids_init(&state, args) != 0) {
+ return -1;
+ }
- while (!state.quit && !state.bottom) {
+ while (!state.bottom) {
state.bottom = true;
- if (bftw_impl(&ids_args) != 0) {
- state.error = errno;
- state.quit = true;
+ if (bftw_impl(&state.nested) != 0) {
+ goto done;
}
state.min_depth = state.max_depth;
state.max_depth *= 2;
}
- if (!state.quit && (args->flags & BFTW_POST_ORDER)) {
+ if (args->flags & BFTW_POST_ORDER) {
state.visit = BFTW_POST;
state.min_depth = 0;
- ids_args.flags |= BFTW_POST_ORDER;
+ state.nested.flags |= BFTW_POST_ORDER;
- if (bftw_impl(&ids_args) != 0) {
- state.error = errno;
- }
+ bftw_impl(&state.nested);
}
- return bftw_ids_finish(&state);
+done:
+ return bftw_ids_destroy(&state);
}
int bftw(const struct bftw_args *args) {
switch (args->strategy) {
case BFTW_BFS:
case BFTW_DFS:
- return bftw_impl(args);
+ return bftw_walk(args);
case BFTW_IDS:
return bftw_ids(args);
case BFTW_EDS:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 01:21:43 +0000