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buflib: add handle_to_block_end

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Change-Id: I598cf32bc8cd08ab4bca3827645e0a38b284468f
This commit is contained in:
Aidan MacDonald 2022-04-03 10:45:11 +01:00
parent 88b21731fc
commit ecfec3e9bf
1 changed files with 15 additions and 1 deletions
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16
firmware/buflib.c
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@ -317,6 +317,20 @@ void handle_free(struct buflib_context *ctx, union buflib_data *handle)
ctx->compact = false; ctx->compact = false;
} }
static inline
union buflib_data* handle_to_block_end(struct buflib_context *ctx, int handle)
{
void *ptr = buflib_get_data(ctx, handle);
/* this is a valid case for shrinking if handle
* was freed by the shrink callback */
if (!ptr)
return NULL;
union buflib_data *data = ALIGN_DOWN(ptr, sizeof(*data));
return data;
}
/* Get the start block of an allocation */ /* Get the start block of an allocation */
static inline static inline
union buflib_data* handle_to_block(struct buflib_context* ctx, int handle) union buflib_data* handle_to_block(struct buflib_context* ctx, int handle)
@ -1038,7 +1052,7 @@ buflib_shrink(struct buflib_context* ctx, int handle, void* new_start, size_t ne
const char* buflib_get_name(struct buflib_context *ctx, int handle) const char* buflib_get_name(struct buflib_context *ctx, int handle)
{ {
union buflib_data *data = ALIGN_DOWN(buflib_get_data(ctx, handle), sizeof (*data)); union buflib_data *data = handle_to_block_end(ctx, handle);
size_t len = data[-bidx_BSIZE].val; size_t len = data[-bidx_BSIZE].val;
if (len <= BUFLIB_NUM_FIELDS) if (len <= BUFLIB_NUM_FIELDS)
return NULL; return NULL;