From 9632360caa5e6511b0ec13cb4c55eb64408232b5 Mon Sep 17 00:00:00 2001 From: Jeff Epler Date: Tue, 30 Aug 2022 03:20:04 -0500 Subject: Use a macro to compute the size of arrays at compile time (#18044) * Add ARRAY_SIZE and CEILING utility macros * Apply a coccinelle patch to use ARRAY_SIZE * fix up some straggling items * Fix 'make test:secure' * Enhance ARRAY_SIZE macro to reject acting on pointers The previous definition would not produce a diagnostic for ``` int *p; size_t num_elem = ARRAY_SIZE(p) ``` but the new one will. * explicitly get definition of ARRAY_SIZE * Convert to ARRAY_SIZE when const is involved The following spatch finds additional instances where the array is const and the division is by the size of the type, not the size of the first element: ``` @ rule5a using "empty.iso" @ type T; const T[] E; @@ - (sizeof(E)/sizeof(T)) + ARRAY_SIZE(E) @ rule6a using "empty.iso" @ type T; const T[] E; @@ - sizeof(E)/sizeof(T) + ARRAY_SIZE(E) ``` * New instances of ARRAY_SIZE added since initial spatch run * Use `ARRAY_SIZE` in docs (found by grep) * Manually use ARRAY_SIZE hs_set is expected to be the same size as uint16_t, though it's made of two 8-bit integers * Just like char, sizeof(uint8_t) is guaranteed to be 1 This is at least true on any plausible system where qmk is actually used. Per my understanding it's universally true, assuming that uint8_t exists: https://stackoverflow.com/questions/48655310/can-i-assume-that-sizeofuint8-t-1 * Run qmk-format on core C files touched in this branch Co-authored-by: Stefan Kerkmann --- quantum/rgb_matrix/rgb_matrix_drivers.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'quantum/rgb_matrix') diff --git a/quantum/rgb_matrix/rgb_matrix_drivers.c b/quantum/rgb_matrix/rgb_matrix_drivers.c index 27fa7369bf..99151e5a92 100644 --- a/quantum/rgb_matrix/rgb_matrix_drivers.c +++ b/quantum/rgb_matrix/rgb_matrix_drivers.c @@ -369,7 +369,7 @@ static inline void setled(int i, uint8_t r, uint8_t g, uint8_t b) { } static void setled_all(uint8_t r, uint8_t g, uint8_t b) { - for (int i = 0; i < sizeof(rgb_matrix_ws2812_array) / sizeof(rgb_matrix_ws2812_array[0]); i++) { + for (int i = 0; i < ARRAY_SIZE(rgb_matrix_ws2812_array); i++) { setled(i, r, g, b); } } -- cgit v1.2.3