• Dual license tinyxxd under both GPL-2.0-only and MIT (closes #7, thanks @philiptaron, @emilazy, @Ordoviz and @oliverkwebb)

• Update benchmark scripts.
• Update CI configuration.
• Update documentation.
• Add an initial man page (ref #6, thanks @philiptaron).
• Add AUTHORS.md (ref #7, thanks @philiptaron and @emilazy).
• Updated README.md (ref #8, thanks @philiptaron).

• Use the address senitizer for unit tests + add tests b49cca53833b3f336a5744b88b89ae1d1bbec13c (thanks @Ordoviz)
• Add tests to the Makefile 3c48309e7de6e44e5262353c9316c322466946c0 (thanks @Ordoviz)
• Add asterisks to output in autoskip mode (-a), 2204d75eede6ff3b9628202780dbde6f04054a33 (thanks @Ordoviz)
• Fix bss buffer overflows 8c5cb0f431173ade03b89e779195e146e3eeef86 (thanks @Ordoviz)
• Fix -a -E -R always behaving incorrectly 27df9896ae95cc8200e80a70cfb5cbacb3d2a577 (thanks @Ordoviz)
• Use EXIT_FAILURE instead of 1.
• Update documentation.

• Some refactoring.
• Re-order some if/elseif/else blocks based on the most used execution paths.
• Declare and initialize buffers in the main function + remove a #define.
• Add 1 to LLEN only once.
• Remove the last remaining #define by replacing it with an enum.
• Add a COLS enum instead of passing it in as an argument to several functions.
• Add (void) to a function signature so that the program also compiles on macOS.
• Various changes to benchmarks and tests.
• Update documentation.

• Mark three functions as static inline.
• Make adjustments to the default CFLAGS in the Makefile.
• Update the CI configuration and the CI badge in README.md.

Performance

• Let colors enabled and ASCII (as opposed to EBCDIC) be the "happy path" that the code is optimized for.
• Do not check hextype in multiple locations. Check it once in main and then call the right function.
• Refactor several if-expressions and switches.
• Mark several functions as inline.
• Use const for several of the function arguments and variables.
• Identify performance bottlenecks using Valgrind and kcachegrind.

Code quality

• Use implicit checks for NULL and 0. (thanks @oliverkwebb).
• Add missing (void) arguments (thanks @oliverkwebb).
• Output usage information without using snprintf (thanks @oliverkwebb).
• Introduce a fflush_or_die and a fflush_fseek_and_putc function.
• Use an enum for the terminal colors.
• Use setColor and clearColor instead of colorPrologue and colorEpilogue.
• Let the ignore variable be a bool instead of an int.
• Remove unused variables and function arguments.
• Let a few variables be local instead of global.
• Rename some functions.

Tooling

• Add a profile target to the Makefile.
• Add a benchmark script for Python 3 named bench.py that confirms that the performance is mostly IO-bound, and also outputs a couple of graphs by using gnuplot.
• Add GitHub action configuration for benchmarking, generating Markdown and graphs and committing the results to the main branch.
• Move the functionality of the release.sh script into the Makefile, and remove the script.
• Add support for fuzzing by running make fuzz, by using afl-gcc and afl-fuzz.

TinyXXD 1.2.0

main.c

• Remove an unused function call (ref #1, thanks @Harazi).
• Use a switch instead of if/else in get_ascii_char and get_ebcdic_char .
• Rename pname to program_name, fpi to input_file and fpo to output_file .
• Let output_file be global, and use char literals instead of numbers (ref #2, thanks @oliverkwebb).
• Let the input_file be global.
• Let the variables COL and LLEN be defines instead of constexpr, to support versions of C before C23.
• Use booleans instead of ints, whenever possible.
• Remove the perror_exit function, but let the error_exit have the same functionality if no message is passed in.
• Define lower_hex_digits and upper_hex_digits separately, rather than having an index number change to indicate lower or upper digits.
• Call fprintf once when the --help flag is passed in, instead of once per line of output.
• Remove the conditionalCapitalize function, and move the check for if hex digits should be capitalized outside of the for-loops where it is used.
• Add an uppercase_hex boolean, for if the -u flag is passed in, and move the check outside of the loops where it is used.

Makefile

• Add tests.
• Add a fmt target to the Makefile that calls clang-format and formats the source code.
• Add -finline-functions to the default flags, and remove the inline keyword from all function declarations.
• Let make clean also remove *.o.
• Support macOS.

Various

• Specifically support C11.
• Format the source code with clang-format and the WebKit style.
• Add CI configuration for both Arch Linux and macOS.
• Update documentation.

• Minor changes and performance improvements.
• New logo.

• Create a standalone, GPL2-licensed, better performing, C18 version of the xxd utility that comes with ViM.