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util/dynarray: add util_dynarray_resize_zero()

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convenience function(s) to zero the new allocation and avoid bugs

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34654>
This commit is contained in:
Mike Blumenkrantz 2025-04-22 10:40:44 -04:00 • committed by Marge Bot
parent a99e5be446
commit 7b17dbd0c0
1 changed files with 13 additions and 1 deletions
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14
src/util/u_dynarray.h
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@ -135,6 +135,18 @@ util_dynarray_resize_bytes(struct util_dynarray *buf, unsigned nelts, size_t elt
return p;
}
MUST_CHECK static inline void *
util_dynarray_resize_bytes_zero(struct util_dynarray *buf, unsigned nelts, size_t eltsize)
{
size_t size = buf->capacity;
void *ret = util_dynarray_resize_bytes(buf, nelts, eltsize);
if (ret) {
uint8_t *data = (uint8_t*)buf->data;
memset(data + size, 0, buf->capacity - size);
}
return ret;
}
static inline void
util_dynarray_clone(struct util_dynarray *buf, void *mem_ctx,
struct util_dynarray *from_buf)
@ -203,6 +215,7 @@ util_dynarray_append_dynarray(struct util_dynarray *buf,
#define util_dynarray_append_array(buf, type, v, count) do {memcpy(util_dynarray_grow_bytes((buf), count, sizeof(type)), v, sizeof(type) * count);} while(0)
/* Returns a pointer to the space of the first new element (in case of growth) or NULL on failure. */
#define util_dynarray_resize(buf, type, nelts) util_dynarray_resize_bytes(buf, (nelts), sizeof(type))
#define util_dynarray_resize_zero(buf, type, nelts) util_dynarray_resize_bytes_zero(buf, (nelts), sizeof(type))
#define util_dynarray_grow(buf, type, ngrow) util_dynarray_grow_bytes(buf, (ngrow), sizeof(type))
#define util_dynarray_top_ptr(buf, type) ((type*)((char*)(buf)->data + (buf)->size - sizeof(type)))
#define util_dynarray_top(buf, type) *util_dynarray_top_ptr(buf, type)
@ -243,4 +256,3 @@ util_dynarray_append_dynarray(struct util_dynarray *buf,
#endif
#endif /* U_DYNARRAY_H */