gosix

code in this repo is golfed c99 using only the c standard library with no specific platform/target

environment variables will be hard coded on a per-utility basis

utility sources are in the src directory, and testing scripts are in the test directory

Building

to build all utilities run

make

to build a specific utility run

make bin/[utility]

the compiled utilities will be in the generated ./bin directory

to clean old builds run

make clean

formatting

this is a golf project, so any formatting goes as long as it is short.

for in-progress source files newlines/tabs can be used to spread out code, but spaces should be used for necessary whitespace.

i.e

return 1;
//----^

this allows for an easy formatting fix with

sed s/[\t\n]//g

and some manual new lines after preprocessing directives.

TODO

listed below is a (incomplete) list of posix utilities that you can write with the given restrictions that have yet to be implemented.

doable:

• tail
• cal
• more
• nl
• chrontab
• cmp

technically doable:

• comm
• awk
• vi
• printf
• diff
• patch
• lex
• sed

mostly doable (some flags not supported):

• rm (-r flag is impossible)
• grep (-r flag is impossible)
• cp (-r flag is impossible)
• mv (-r flag and can't make/move directories)

Intent

the intent here is to implement as many standalone, platform agnostic, single-file POSIX utilities as standard c99 and the c99 standard library allow (mostly for fun).

posix standard

https://www.open-std.org/jtc1/sc22/open/n4217.pdf

list of all posix utilities

https://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html

utitlity defaults

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap01.html#tag_17_04