diff options
Diffstat (limited to 'source/blender/blenlib/intern/BLI_linklist.c')
-rw-r--r-- | source/blender/blenlib/intern/BLI_linklist.c | 79 |
1 files changed, 76 insertions, 3 deletions
diff --git a/source/blender/blenlib/intern/BLI_linklist.c b/source/blender/blenlib/intern/BLI_linklist.c index a0b61e7945c..391f3ef7702 100644 --- a/source/blender/blenlib/intern/BLI_linklist.c +++ b/source/blender/blenlib/intern/BLI_linklist.c @@ -32,6 +32,8 @@ #include "MEM_guardedalloc.h" + +#include "BLI_utildefines.h" #include "BLI_linklist.h" #include "BLI_memarena.h" #include "BLI_mempool.h" @@ -85,6 +87,77 @@ void BLI_linklist_reverse(LinkNode **listp) } /** + * Move an item from its current position to a new one inside a single-linked list. + * Note *listp may be modified. + */ +void BLI_linklist_move_item(LinkNode **listp, int curr_index, int new_index) +{ + LinkNode *lnk, *lnk_psrc = NULL, *lnk_pdst = NULL; + int i; + + if (new_index == curr_index) { + return; + } + + if (new_index < curr_index) { + for (lnk = *listp, i = 0; lnk; lnk = lnk->next, i++) { + if (i == new_index - 1) { + lnk_pdst = lnk; + } + else if (i == curr_index - 1) { + lnk_psrc = lnk; + break; + } + } + + if (!(lnk_psrc && lnk_psrc->next && (!lnk_pdst || lnk_pdst->next))) { + /* Invalid indices, abort. */ + return; + } + + lnk = lnk_psrc->next; + lnk_psrc->next = lnk->next; + if (lnk_pdst) { + lnk->next = lnk_pdst->next; + lnk_pdst->next = lnk; + } + else { + /* destination is first element of the list... */ + lnk->next = *listp; + *listp = lnk; + } + } + else { + for (lnk = *listp, i = 0; lnk; lnk = lnk->next, i++) { + if (i == new_index) { + lnk_pdst = lnk; + break; + } + else if (i == curr_index - 1) { + lnk_psrc = lnk; + } + } + + if (!(lnk_pdst && (!lnk_psrc || lnk_psrc->next))) { + /* Invalid indices, abort. */ + return; + } + + if (lnk_psrc) { + lnk = lnk_psrc->next; + lnk_psrc->next = lnk->next; + } + else { + /* source is first element of the list... */ + lnk = *listp; + *listp = lnk->next; + } + lnk->next = lnk_pdst->next; + lnk_pdst->next = lnk; + } +} + +/** * A version of prepend that takes the allocated link. */ void BLI_linklist_prepend_nlink(LinkNode **listp, void *ptr, LinkNode *nlink) @@ -96,7 +169,7 @@ void BLI_linklist_prepend_nlink(LinkNode **listp, void *ptr, LinkNode *nlink) void BLI_linklist_prepend(LinkNode **listp, void *ptr) { - LinkNode *nlink = MEM_mallocN(sizeof(*nlink), "nlink"); + LinkNode *nlink = MEM_mallocN(sizeof(*nlink), __func__); BLI_linklist_prepend_nlink(listp, ptr, nlink); } @@ -135,7 +208,7 @@ void BLI_linklist_append_nlink(LinkNode **listp, void *ptr, LinkNode *nlink) void BLI_linklist_append(LinkNode **listp, void *ptr) { - LinkNode *nlink = MEM_mallocN(sizeof(*nlink), "nlink"); + LinkNode *nlink = MEM_mallocN(sizeof(*nlink), __func__); BLI_linklist_append_nlink(listp, ptr, nlink); } @@ -177,7 +250,7 @@ void *BLI_linklist_pop_pool(struct LinkNode **listp, struct BLI_mempool *mempool void BLI_linklist_insert_after(LinkNode **listp, void *ptr) { - LinkNode *nlink = MEM_mallocN(sizeof(*nlink), "nlink"); + LinkNode *nlink = MEM_mallocN(sizeof(*nlink), __func__); LinkNode *node = *listp; nlink->link = ptr; |