#printm - a modular micro printf replacement for 65C02
Here is a modular micro replacement: printm()
- Literals have the high byte set (APPLE text)
- Meta characters have the high bit cleared (ASCII)
$ Hex - print 1 Byte (2 characters)
x Hex - print 2 Bytes (4 characters)
@ Ptr - print hex 1 Byte at 16-bit pointer
& Ptr - print hex 2 Bytes at 16-bit pointer
# Dec - Print 1 Byte in decimal (max 2 digits)
d Dec - Print 1 Byte in decimal (max 3 digits)
u Dec - Print 2 Bytes in decimal (max 5 digits)
b Dec - Print signed 1 Byte in decimal
% Bin - Print 8 bits
? Bin - Print 8 bits but 1's in inverse
o Oct - Print 1 Byte in octal (max 3 digits)
O Oct - Print 2 Byte in octal (max 6 digits)
a Str - APPLE text (high bit set), last char is ASCII
s Str - C string, zero terminated
p Str - Pascal string, first byte is string length
Each option can individually be enabled / disabled to control the memory footprint since you probably don't need "every" feature. Seriously, when was the last time you needed octal? :-)
printm() has manually been optimized for size. In gcc parlance, -Os.
With everything enabled printm() takes up less then 512 bytes.
See the latest code for the exact byte usage!
- By: Michael Pohoreski
- Copyleft {c} Feb, 2016
Special Thanks:
- Sheldon for his 65C02 printf() source
- qkumba optimizations
Join the discussion in comp.sys.apple2.programmer