return n/a instead of exiting if a specific value cannot be read

add config checks on startup for better error handling

add update_interval

add a short sleep to reduce load

make config.h target depending on config.def.h

simplify smprintf by using vasprintf

simplified config.def.h

Merge pull request #5 from Vlaix/master

Fixed small buffer in get_datetime()

better screenshot

small changes (var names)

starting in README.md

put everything in logical order

Merge pull request #4 from Vlaix/ram

Changed RAM calculation formula.

contributors

changed to easier variable names

changed to 4 spaces indentation (2 are not enough)

Merge pull request #3 from Vlaix/master

Fixed broken wifi

Merge pull request #2 from pfannkuchengesicht/master

fixed some memory leaks

fixed tabs xD

fixed typo in README.md (jpg <-> png)

added screenshot

variable names

commented and reordered

revised everything

added config.def.h handling and fixed typo

initial commit

Initial commit

fixed some memory leaks

Fixed broken wifi
Fixed indentation
Removed trailig white spaces

Changed RAM calculation formula.

Former : MemTotal - MemAvailable
New : (MemTotal - MemFree) - (Buffers + Cached)

Fixed small buffer in get_datetime()

The buffer being hardcoded to 19 (the size expected from the default time format),
strftime() would fail on any format returning a longer buffer.
Changed it from 19 to 64 to accomodate longer formats.