921b9711ea util: introduce and use `ARRAY_SIZE` macro (Sebastian Falbesoner)
Pull request description:
This PR is another tiny improvement found while working on #1765, with the goal to avoid code repetition.
The `ARRAY_SIZE` macro definition is pretty wide-spread in C projects and e.g. matches the one [used in the Linux Kernel](9702969978/include/linux/array_size.h (L11)) (without the additional check to reject pointers, as we would need GNU C for that, see e.g. https://stackoverflow.com/a/19455169; not sure if a useful counterpart exists that only relies on C89). Replacement instances were identified via `$ git grep sizeof.*/.*sizeof`.
ACKs for top commit:
w0xlt:
ACK 921b9711ea
real-or-random:
utACK 921b9711ea
Tree-SHA512: 44b6bf0132cf00fade526a3fc04e03dc896d04874123614c032206b61f97c81f94d139b6cc0c108eceaa699251580c19420d230b3150607303ca2cb7ab9a0bcb
In the bench and bench_internal help functions argv was not being
passed, in this change we pass in argv[0] and use it in the help text.
Additionally instead of passing all of argv in bench_ecmult we now
just pass argv[0] and is used as the executable_path variable.
In this change the get_iters function was updated to print an error
message and then return 0. In the functions that use get_iters they
print the help text and then EXIT_FAILURE
The following functions were created:
1. bench.c: help()
- prints the help to the command-line
2. bench.h: have_invalid_args()
- takes a list of arguments that the user is allowed to enter on the command-line
- returns 1 if the user entered an invalid argument
- returns 0 if all the user entered arguments are valid
