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[core] keep a->data[] sorted (REVERT) 

This reverts commit 2260a8062ee599ecf28d9b52b981603fd2084aff.

original ordering of array elements is significant
e.g. in lighttpd.conf lists where first match to request is applied
This commit is contained in:
Glenn Strauss 2019-10-14 01:44:06 -04:00
parent 78cf61b152
commit a762402da5
5 changed files with 53 additions and 24 deletions
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58
src/array.c
View File

@ -15,7 +15,9 @@ __attribute_cold__
static void array_extend(array * const a) {
a->size += 16;
a->data = realloc(a->data, sizeof(*a->data) * a->size);
a->sorted = realloc(a->sorted, sizeof(*a->sorted) * a->size);
force_assert(a->data);
force_assert(a->sorted);
memset(a->data+a->used, 0, (a->size-a->used)*sizeof(*a->data));
}
@ -30,6 +32,7 @@ array *array_init(void) {
}
void array_free_data(array * const a) {
if (a->sorted) free(a->sorted);
data_unset ** const data = a->data;
const uint32_t sz = a->size;
for (uint32_t i = 0; i < sz; ++i) {
@ -47,6 +50,9 @@ void array_copy_array(array * const dst, const array * const src) {
dst->data = calloc(src->size, sizeof(*src->data));
force_assert(NULL != dst->data);
dst->sorted = malloc(sizeof(*src->sorted) * src->size);
force_assert(NULL != dst->sorted);
memcpy(dst->sorted, src->sorted, sizeof(*src->sorted) * src->used);
for (uint32_t i = 0; i < src->used; ++i) {
dst->data[i] = src->data[i]->fn->copy(src->data[i]);
}
@ -82,6 +88,7 @@ data_unset *array_pop(array * const a) {
a->used --;
du = a->data[a->used];
force_assert(a->sorted[a->used] == a->used); /* only works on "simple" lists */
a->data[a->used] = NULL;
return du;
@ -110,9 +117,9 @@ static int array_keycmp(const char * const a, const size_t alen, const char * co
return alen < blen ? -1 : alen > blen ? 1 : array_caseless_compare(a, b, blen);
}
/* If key is found, returns pos (pos >= 0) into a->data[]
* If key is not found, returns -pos-1 if that is the position-1 in a->data[]
* where the key would be inserted (-1 to avoid -0)
/* returns pos into a->sorted[] which contains index to data in a->data[]
* if pos >= 0, or returns -pos-1 if that is the position-1 in a->sorted[]
* where the key needs to be inserted (-1 to avoid -0)
*/
__attribute_hot__
__attribute_pure__
@ -123,7 +130,7 @@ static int32_t array_get_index(const array * const a, const char * const k, cons
uint32_t lower = 0, upper = a->used;
while (lower != upper) {
uint32_t probe = (lower + upper) / 2;
const buffer * const b = &a->data[probe]->key;
const buffer * const b = &a->data[a->sorted[probe]]->key;
/* key is non-empty (0==b->used), though possibly blank (1==b->used),
* if inserted into key-value array */
/*force_assert(b && b->used);*/
@ -143,26 +150,42 @@ static int32_t array_get_index(const array * const a, const char * const k, cons
__attribute_hot__
data_unset *array_get_element_klen(const array * const a, const char *key, const size_t klen) {
const int32_t ipos = array_get_index(a, key, klen);
return ipos >= 0 ? a->data[ipos] : NULL;
return ipos >= 0 ? a->data[a->sorted[ipos]] : NULL;
}
/* non-const (data_config *) for configparser.y (not array_get_element_klen())*/
data_unset *array_get_data_unset(const array * const a, const char *key, const size_t klen) {
const int32_t ipos = array_get_index(a, key, klen);
return ipos >= 0 ? a->data[ipos] : NULL;
return ipos >= 0 ? a->data[a->sorted[ipos]] : NULL;
}
data_unset *array_extract_element_klen(array * const a, const char *key, const size_t klen) {
const int32_t ipos = array_get_index(a, key, klen);
if (ipos < 0) return NULL;
/* remove entry from a->data: move everything after pos one step left */
data_unset * const entry = a->data[ipos];
const uint32_t last_ndx = --a->used;
if (last_ndx != (uint32_t)ipos) {
data_unset ** const d = a->data + ipos;
memmove(d, d+1, (last_ndx - (uint32_t)ipos) * sizeof(*d));
}
const uint32_t ndx = a->sorted[ipos], pos = (uint32_t)ipos;
data_unset * const entry = a->data[ndx];
/* now we need to swap it with the last element (if it isn't already the last element) */
if (ndx != last_ndx) {
/* to swap we also need to modify the index in a->sorted - find pos of last_elem there */
int32_t last_elem_pos = array_get_index(a, CONST_BUF_LEN(&a->data[last_ndx]->key));
/* last element must be present at the expected position */
force_assert(last_ndx == a->sorted[last_elem_pos]);
/* move entry from last_ndx to ndx */
a->data[ndx] = a->data[last_ndx];
/* fix index entry for moved entry */
a->sorted[last_elem_pos] = ndx;
}
/* remove entry in a->sorted: move everything after pos one step to the left */
if (pos != last_ndx) {
memmove(a->sorted + pos, a->sorted + pos + 1, (last_ndx - pos) * sizeof(*a->sorted));
}
a->data[last_ndx] = NULL;
return entry;
}
@ -206,12 +229,13 @@ static void array_insert_data_at_pos(array * const a, data_unset * const entry,
const uint32_t ndx = a->used++;
data_unset * const prev = a->data[ndx];
a->data[ndx] = entry;
/* move everything one step to the right */
if (pos != ndx) {
memmove(a->data + (pos + 1), a->data + (pos), (ndx - pos) * sizeof(*a->data));
memmove(a->sorted + (pos + 1), a->sorted + (pos), (ndx - pos) * sizeof(*a->sorted));
}
a->data[pos] = entry;
a->sorted[pos] = ndx;
if (prev) prev->fn->free(prev); /* free prior data, if any, from slot */
}
@ -236,7 +260,7 @@ static data_string * array_insert_string_at_pos(array * const a, const uint32_t
int * array_get_int_ptr(array * const a, const char * const k, const size_t klen) {
int32_t ipos = array_get_index(a, k, klen);
if (ipos >= 0) return &((data_integer *)a->data[ipos])->value;
if (ipos >= 0) return &((data_integer *)a->data[a->sorted[ipos]])->value;
data_integer * const di =array_insert_integer_at_pos(a,(uint32_t)(-ipos-1));
buffer_copy_string_len(&di->key, k, klen);
@ -246,7 +270,7 @@ int * array_get_int_ptr(array * const a, const char * const k, const size_t klen
buffer * array_get_buf_ptr(array * const a, const char * const k, const size_t klen) {
int32_t ipos = array_get_index(a, k, klen);
if (ipos >= 0) return &((data_string *)a->data[ipos])->value;
if (ipos >= 0) return &((data_string *)a->data[a->sorted[ipos]])->value;
data_string * const ds = array_insert_string_at_pos(a, (uint32_t)(-ipos-1));
buffer_copy_string_len(&ds->key, k, klen);
@ -273,7 +297,7 @@ static data_unset **array_find_or_insert(array * const a, data_unset * const ent
/* try to find the entry */
const int32_t ipos = array_get_index(a, CONST_BUF_LEN(&entry->key));
if (ipos >= 0) return &a->data[ipos];
if (ipos >= 0) return &a->data[a->sorted[ipos]];
array_insert_data_at_pos(a, entry, (uint32_t)(-ipos - 1));
return NULL;

3
src/array.h
View File

@ -25,6 +25,9 @@ typedef struct data_unset {
typedef struct {
data_unset **data;
uint32_t *sorted;
uint32_t used; /* <= INT32_MAX */
uint32_t size;
} array;

6
src/mod_alias.c
View File

@ -99,9 +99,9 @@ SETDEFAULTS_FUNC(mod_alias_set_defaults) {
size_t j, k;
for (j = 0; j < a->used; j ++) {
const buffer *prefix = &a->data[j]->key;
const buffer *prefix = &a->data[a->sorted[j]]->key;
for (k = j + 1; k < a->used; k ++) {
const buffer *key = &a->data[k]->key;
const buffer *key = &a->data[a->sorted[k]]->key;
if (buffer_string_length(key) < buffer_string_length(prefix)) {
break;
@ -110,7 +110,7 @@ SETDEFAULTS_FUNC(mod_alias_set_defaults) {
break;
}
/* ok, they have same prefix. check position */
if (a->data[j] < a->data[k]) {
if (a->sorted[j] < a->sorted[k]) {
log_error_write(srv, __FILE__, __LINE__, "SBSBS",
"url.alias: `", key, "' will never match as `", prefix, "' matched first");
return HANDLER_ERROR;

4
src/mod_ssi.c
View File

@ -742,7 +742,7 @@ static int process_ssi_stmt(server *srv, connection *con, handler_ctx *p, const
b = srv->tmp_buf;
buffer_clear(b);
for (i = 0; i < p->ssi_vars->used; i++) {
data_string *ds = (data_string *)p->ssi_vars->data[i];
data_string *ds = (data_string *)p->ssi_vars->data[p->ssi_vars->sorted[i]];
buffer_append_string_buffer(b, &ds->key);
buffer_append_string_len(b, CONST_STR_LEN("="));
@ -750,7 +750,7 @@ static int process_ssi_stmt(server *srv, connection *con, handler_ctx *p, const
buffer_append_string_len(b, CONST_STR_LEN("\n"));
}
for (i = 0; i < p->ssi_cgi_env->used; i++) {
data_string *ds = (data_string *)p->ssi_cgi_env->data[i];
data_string *ds = (data_string *)p->ssi_cgi_env->data[p->ssi_cgi_env->sorted[i]];
buffer_append_string_buffer(b, &ds->key);
buffer_append_string_len(b, CONST_STR_LEN("="));

6
src/mod_status.c
View File

@ -753,9 +753,11 @@ static handler_t mod_status_handle_server_statistics(server *srv, connection *co
b = chunkqueue_append_buffer_open(con->write_queue);
for (i = 0; i < st->used; i++) {
buffer_append_string_buffer(b, &st->data[i]->key);
size_t ndx = st->sorted[i];
buffer_append_string_buffer(b, &st->data[ndx]->key);
buffer_append_string_len(b, CONST_STR_LEN(": "));
buffer_append_int(b, ((data_integer *)(st->data[i]))->value);
buffer_append_int(b, ((data_integer *)(st->data[ndx]))->value);
buffer_append_string_len(b, CONST_STR_LEN("\n"));
}
chunkqueue_append_buffer_commit(con->write_queue);