Finite State Machine With Function Pointers
I am learning to use finite-state machines for some tasks but I am having problems navigating my state table and executing the functions to make it a useful system.
Consider my state machine:
(source: wikimedia.org)
Explanation:
* = Print char to stdout
N = '\n'
S = ' '
A = aA-zZ
The code I started with from Automata-based programming on Wikipedia works for such a simple machine, but I want to modify it so that I can have a more robust state transition table and call functions based off those states.
I've posted working basic code at Pastebin, along with the transtion table style I want to use.
I have not used pointers to functions before so I am not sure how to write the transition functions based off the data received by process_event. Eventually I would like to have a template that allows me to have state in/out & transition in/out functions so I can write complex user menus and even programming algorithms much more efficiently.
Using functions as states is very powerful, but using transition tables is very error prone and painful compared to using recursive functions (function states that return functions). A fantastic implementation for you to consider is the quantum hierarchical statem machine. Although it is only about 1000 lines of code as a base, it has an accompanying book to explain any question you might have about how it works. Very powerful, very fast.
- Why does 1.0/100.0 == 0.1/10.0 give True?
- How to organize the receive msg and user current input in C network such that it's clean
- Using inclusive scan syntax in OpenMP in the C language
- Unable to understand context in book "OOP in C" by Axel Schreiner
- How to dereference member from struct in which the definition is hid from user?
- variable-length array in struct with TI compiler in C (socket programming)
- A faster way to test 32bpp DDBs for a valid Alpha channel
- How can I compile the zephyr example-application as a freestanding application?
- Why does my forked process sometimes overwrite data in a file?
- Why in C can I initialize more values than the size of an array?
- _Generic in C needs typecasting?
- Declaring/defining an unused variable changes the output from an unrelated variable
- How to use gdb to explore the stack/heap?
- How can I read an input string of unknown length?
- Confused by difference between expression inside if and expression outside if
- Fast Arc Cos algorithm?
- Discrepancy of `unsigned long` size between llvm and gcc in riscv32
- GCC (C) - error: 'x' redeclared as different kind of symbol
- Why does GCC’s static analyser falsely warn that a pointer to an allocated memory block itself stored in an allocated memory block may leak?
- c language gcc compiler *.i file #3 "" 2 what is this?
- How to make clang compile to llvm IR
- Hashtable implementation in C
- EFI variables or config file on the EFI partition for EFI application?
- Pack high bit of every byte in ARM, for 64 bytes like AVX512 vpmovb2m?
- Calling an external C function (in a shared lib) from Perl with Inline::C does not work
- Can a C program detect if its own source code has been modified?
- Is this declaration UB?
- Eclipse C/C++ how to find variable belongs to which struct quickly
- Is this truly best way to delete last element in C?
- flint/arb.h: No such file or directory