snark13
527d4a6a18
libc/mem/:
• Split bank_io.c into bank_io_w3.c (existing W3 helpers, base 0xC000,
port 0xE2) and bank_io_w1.c (new mirror through W1, base 0x4000,
port 0xA2). Two .rel files so DCE picks only the needed group:
a W3-only user pulls ~70 bytes instead of all 134. W1 variants are
`--memory tiny`-only (any other mode runs code from W1 or uses W1
for the banked-code segment, swapping it crashes).
• mem_alloc.c: add CF=err checks for mem_free_block and mem_get_page
(were silently ignored), per-function docstrings on alloc/free/
get_page/info, drop the confused "wait wrong order" comment in
mem_info. Header sprinter_mem.h gets matching per-function doc.
libc/stdio/:
• Add hex_print.c (hex8/hex16/hex32, ~26 bytes) and dec_print.c
(dec8/dec16/dec32, ~170 bytes) ported from solid-c STDLIB.ASM.
Replaces the printf("%u"/"%X") wrappers in solid_helpers.c that
dragged in the 3-5 KB printf machinery.
- hex* use the classic cp 10 / sbc 0x69 / daa nibble→ASCII trick;
hex8 self-calls for the high nibble, hex16/hex32 tail-call hex8.
- dec32 is the master routine; dec8/dec16 jump into shared entry
points (__dec_entry3 / __dec_entry5). 32-bit subtract-power-of-10
keeps the high 16 bits in HL alt (shadow set).
- DISCOVERY: ESTEX PUTCHAR ($5B) on our Sprinter build preserves
the main register set + IX but CLOBBERS the shadow set
(BC'/DE'/HL'). solid-c's original code assumed otherwise and
garbled output for values ≥ 6 digits. Fix: save/restore HL alt
around the RST 10 in _dec_emit_or_skip. Documented in
memory/estex_putchar_abi.md.
• file.c: drop stdaux/stdprn (no Sprinter printer API), change
stdin/stdout/stderr fd markers to 0/-1/-2 (positive fds clash with
ESTEX OPEN return values), add TODO header pointing at v2 buffered
FILE rewrite (see docs/TODO.md for the Solid-C reference struct).
bin/sprinter-cc:
• --memory big and --memory huge now always use crt0_banked.s (was:
only with --bank flags), matching docs/memory_modes_implemented.md.
When the user has no --bank flags, generate a tiny stub with
`const uint8_t n_banks = 0;` and assemble bank.s for _bank_pages.
Without this fix, openenv with --memory big could not see the
estex_file_handle symbol exported by crt0_banked.
examples/openenv:
• Add usage of estex_file_handle to confirm the crt0_banked startup-
info is reachable. Local extern decl — keeps the symbol out of
sprinter.h since it only exists in big/huge builds.
examples/dec_test:
• New regression test covering hex8/16/32 and dec8/16/32 across the
interesting boundary values.
.gitignore: add .kilo/ (editor session cache).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* hex_print.c — compact hex print primitives ported from solid-c
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* (third_party/solid-c/SRC/CLIB/STDLIB.ASM, modules hex8/hex16/hex32).
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*
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* void hex8 (uint8_t v) — always-2-digit "00" .. "FF"
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* void hex16(uint16_t v) — always-4-digit "0000" .. "FFFF"
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* void hex32(uint32_t v) — always-8-digit "00000000" .. "FFFFFFFF"
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*
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* Each nibble is emitted via the classic Z80 `cp 10 / sbc 0x69 / daa`
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* trick — 5 bytes per nibble. hex8 self-calls for the high nibble
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* then falls through for the low nibble. hex16/hex32 split into two
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* hex8/hex16 calls.
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*
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* ESTEX PUTCHAR ($5B) preserves IX (empirically verified) so we skip
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* the usual push/pop ix around the RST.
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*/
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#include <stdio.h>
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#include <stdint.h>
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void hex8(uint8_t v) __naked
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{
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(void)v;
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__asm
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;; A = v on entry.
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push af
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rra
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rra
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rra
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rra
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call _hex8_digit
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pop af
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_hex8_digit:
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and a, #0x0F
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cp a, #10
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sbc a, #0x69
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daa
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ld c, #0x5B
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rst #0x10
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ret
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__endasm;
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}
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void hex16(uint16_t v) __naked
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{
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(void)v;
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__asm
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;; HL = v on entry.
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ld a, h
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push hl
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call _hex8
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pop hl
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ld a, l
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jp _hex8 ; tail-call
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__endasm;
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}
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void hex32(uint32_t v) __naked
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{
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(void)v;
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__asm
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;; HL = high16, DE = low16 on entry (SDCC HLDE).
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push de
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call _hex16
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pop hl
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jp _hex16 ; tail-call
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__endasm;
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}
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