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authorTavian Barnes <tavianator@tavianator.com>2016-05-17 15:54:16 -0400
committerTavian Barnes <tavianator@tavianator.com>2016-05-17 15:54:49 -0400
commit120fc56d436a4b8791fc82389192a6ca2efdece5 (patch)
treeaf659109b5ad31431410e54f9fb1aa9234ebff28 /bftw.c
parent4f7ced52c09ce4e59bf74989d71991a7da168fac (diff)
downloadbfs-120fc56d436a4b8791fc82389192a6ca2efdece5.tar.xz
bftw: Use realloc() to grow the dirqueue.
Diffstat (limited to 'bftw.c')
-rw-r--r--bftw.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/bftw.c b/bftw.c
index 7a0594e..8dd98c9 100644
--- a/bftw.c
+++ b/bftw.c
@@ -422,27 +422,25 @@ static int dirqueue_push(struct dirqueue *queue, struct dircache_entry *entry) {
if (back == queue->front) {
size_t old_size = queue->mask + 1;
- struct dircache_entry **old_entries = queue->entries;
-
size_t new_size = 2*old_size;
- struct dircache_entry **new_entries = malloc(new_size*sizeof(struct dircache_entry *));
- if (!new_entries) {
+
+ struct dircache_entry **entries = realloc(queue->entries, new_size*sizeof(struct dircache_entry *));
+ if (!entries) {
return -1;
}
- size_t mid = old_size - back;
- memcpy(new_entries, old_entries + back, mid*sizeof(struct dircache_entry *));
- memcpy(new_entries + mid, old_entries, back*sizeof(struct dircache_entry *));
- free(old_entries);
+ size_t old_front = queue->front;
+ size_t new_front = old_size + old_front;
+ size_t tail_size = old_size - old_front;
- queue->entries = new_entries;
+ memcpy(entries + new_front, entries + old_front, tail_size*sizeof(struct dircache_entry *));
+
+ queue->entries = entries;
queue->mask = new_size - 1;
- queue->front = 0;
- queue->back = old_size;
- } else {
- queue->back = back;
+ queue->front = new_front;
}
+ queue->back = back;
return 0;
}