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53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
#printm - a modular micro printf replacement for 65C02
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Here is a *modular* _micro_ replacement: printm()
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* Literals have the high byte set (APPLE text)
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* Meta characters have the high bit cleared (ASCII)
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```
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$ Hex - print 2 Byte
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x Hex - print 4 Byte
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@ Ptr - print hex byte at 16-bit pointer
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& Ptr - print hex word at 16-bit pointer
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# Dec - Print 1 Byte in decimal (max 2 digits)
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d Dec - Print 2 Byte in decimal (max 3 digits)
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u Dec - Print 2 Byte in decimal (max 5 digits)
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b Dec - Print signed byte in decimal
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% Bin - Print 8 bits
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? Bin - Print 8 bits but 1's in inverse
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o Oct - Print 1 Byte in octal (max 3 digits)
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O Oct - Print 2 Byte in octal (max 6 digits)
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a Str - APPLE text (high bit set), last char is ASCII
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s Str - C string, zero terminated
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p Str - Pascal string, first character is string length
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```
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Each option can individually be enabled / disabled
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to control the memory footprint since you probably
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don't need "every" feature. Seriously, when was the last time
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you _needed_ octal? :-)
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printm() has manually been optimized for size. In gcc parlance, `-Os`.
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With everything enabled printm() takes up less then 512 bytes.
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See the latest code for the exact byte usage!
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* By: Michael Pohoreski
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* Copyleft {c} Feb, 2016
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Special Thanks:
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* Sheldon for his 65C02 printf() source
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* qkumba optimizations
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Join the discussion in comp.sys.apple2.programmer
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* https://groups.google.com/forum/#!topic/comp.sys.apple2.programmer/cXqTp7YLYuo
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