snark13
737c974400
- Split tests/ (libc feature tests) and examples/ (real apps); shared
app.mk in repo root, was examples/example.mk
- libc/io/* split into libc/{conio,env,errno,file,mouse,string,sys,
time,video}/ — clearer module boundaries
- New examples/mdview/: markdown viewer (Phases 1-5 + light nested
lists). Headers (H1-H4), HR, ulist/olist/quote with nesting via
leading spaces, fenced code blocks, inline emphasis (bold/italic/
underscore/code), wrap/unwrap mode with soft wrap (F2), horizontal
pan (← →) with '>' truncation indicator
- libc additions: scroll() in conio (ESTEX SCROLL), strlwr/strupr,
gets() test
- Makefile updates across tests/ for the new shared app.mk path
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* videomode_raw.c — low-level ESTEX SETVMOD / GETVMOD ($50 / $51).
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*
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* Plain getters/setters with NO mode-class validation. Used by both
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* conio (text-validated public API) and gfx (graphics modes). Lives
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* in its own .c so a pure graphics program does not pull in the entire
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* conio module to switch modes.
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*
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* Public conio functions in conio.c wrap these with a text-mode check;
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* gfx_init / gfx_done in gfx_core.c call them directly.
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*/
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#include <stdint.h>
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#include <errno.h>
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uint8_t _videomode_raw_get(void) __naked
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{
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__asm
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push ix
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ld c, #0x51 ; ESTEX GETVMOD
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rst #0x10
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pop ix
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;; uint8_t returns in A — ESTEX already put mode there.
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ret
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__endasm;
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}
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int _videomode_raw_set(uint8_t mode) __naked
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{
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(void)mode;
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__asm
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;; SDCC __sdcccall(1) passes uint8_t in A — leave it there.
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push ix
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ld bc, #0x0050 ; ESTEX SETVMOD (B=0 (page), C=0x50)
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rst #0x10
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jr c, _vmr_err
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ld de, #0
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pop ix
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ret
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_vmr_err:
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call __errno_set
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ld de, #-1
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pop ix
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ret
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__endasm;
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}
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