README.md

Collection of code snippets for everyday use

• ./C/ErrorHandling - Handle multiple errors with errno

• ./C/Labels_as_Values_Direct_Threaded - GCC Labels as Values

Allows implementing efficient interpretters or VMs. Each command (operation) should be encoded with an integer value which is then used as goto label in main loop instead of giant switch or if-then-else.

Reference: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

Update

Code snipped was extended to support one operand per operation, its type depends on the op.

• ./C/StackViolation - Access to values on stack referenced by dead pointer

  FreeBSD: works both methods through dead pointer and through function call.

  Linux: access through function call only works, access through dead pointer make it segfaults.

• ./C/main_as_array - It's possible to define main symbol as an array and put machine code in it

• ./C/BufferOverflow - Examples of buffer overflow bugs and how to catch them

• ./C/BranchlessProgramming - Branchless implementation of abs(), clamp() and partition()

  Derived from: https://sanixdk.xyz/blogs/the-weird-concept-of-branchless-programming

• ./C/FreeBSD_gprof - Profiling C programs on FreeBSD using gprof

• ./C/Quine - Quine in C, a simple self-reproducable C program

• ./C/goto_iterator - Interate using goto

  Derived from: https://xavierleroy.org/control-structures/book/main006.html

• ./C/Plasma - Simple shader in C++ on CPU.

  Derived from: https://gist.github.com/rexim/ef86bf70918034a5a57881456c0a0ccf

• ./C/Preload - How to use LD_PRELOAD to substitute system library function, namely malloc().

• ./C/Gtk3Hello - Display empty windows using GTK3 toolkit.

  Derived from: https://docs.gtk.org/gtk3/getting_started.html

• ./C/BSDMake - Playing with BSD Make.

  Induced by article: https://docs-archive.freebsd.org/44doc/psd/12.make/paper.pdf

• ./C/FreeBSD_Simple_Driver - Simple Kernel Module (Driver) for FreeBSD

  Derived from Edson Brandi's "FreeBSD Device Drivers" book.

• ./DynamicArrays/ - Dynamic Arrays in pure C.

• ./Verilog/FreqDIV - Frequency divider and simulation test bench

• ./Shell/SIXEL - Show "HI" in terminal using SIXEL graphics mode

  Details are here: https://en.wikipedia.org/wiki/Sixel

• ./RV64I/load_64_bit_constant/ - RV64I assembly code to put arbitrary 64-bit constant in register