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Native print #89
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Native print #89
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scgilardi
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- improves on the built-in print by handling negative integers in compiled
code "properly" -- with a leading minus sign the same as in the simulator.
- currently expands inline due to macros being the only code abstraction
we have
- perhaps useful as a basis of a native print written in porth at some point
- the built-in print is derived from compiling a similar conversion in C
- uses a temporary area within mem (32 bytes) to accumulate the characters
of the output string from back to front.
- a scratch buffer like this might make sense as a peer to mem, str, argv
- alternatively, being able to allocate this temp buffer on the stack seems
like it would be useful in avoiding contention for a global buffer
- uses `rot` which is a basic stack word from ANS forth
- without it, it was not convenient to use the third item on the stack
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print1- an example with native code to print an integer viawritetostdoutincludes an additional stack word
rotbecause without it, using the 3rd item on the stack is inconvenientimplemented as an example because perhaps we don't want to expand print inline on every use.
includes signmag that converts an integer to sign-magnitude form