rajamesandClaude Opus 5.5
a78cc56c31
From the fresh review of the stick's increment 1 (With fixes): - Critical: after logout Zuse's last screen, her prompt included, could be drawn back on a headless machine. The logout clear (ESC[2J) blanked the pixels only: Alt+TAB, still read while headless, redrew the terminal from its saved text; and if she had Alt+TABbed to the graphics view before the pull, the clear did nothing and her session stayed on screen (and the console did not draw at her next login). Now vt100_reset() forgets everything the terminal has shown -- the on-screen text, the scrollback and their boot snapshots -- makes it visible again and fills the screen; and Alt+TAB does nothing while the screen is off (v3's never is, so v3 is unchanged). - Important: an EMERGENCY_CONSOLE_ENABLED build no longer clears the screen when Zuse's drive is pulled: its console goes on running. Red: alttab_after_logout 183308 (4515 lit), alttab_before_pull 183529 (4539 lit; the console not redrawn), emergency_pull 183759 (0 lit). Green: 184115, 184328, 184552; regression 184805-185956 (screens, keyboard, hotplug, emergency, v3 typed by keyboard) all pass. Accepted: 190111, 190312, 190710, POST 538/538, dict_hash 0xfec8c47cfc6f437f; test-32, 39 modules, 0 failures. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
145 lines
5.4 KiB
C
145 lines
5.4 KiB
C
/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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Licensed under the StarForth License, Version 1.0.
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*/
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/**
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* vt100.h — Full-color ANSI / VT100 terminal state machine
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*
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* Sits on top of the framebuffer driver. Call vt100_init() once the
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* framebuffer is ready, then route all character output through vt100_putc().
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*
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* Supported escape sequences
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* ──────────────────────────
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* Cursor movement ESC[H ESC[n;mH ESC[nA ESC[nB ESC[nC ESC[nD
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* Cursor save/restore ESC[s ESC[u (also ESC7 / ESC8)
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* Erase ESC[2J ESC[K ESC[0K ESC[1K ESC[2K
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* SGR attributes ESC[…m (see below)
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*
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* SGR codes
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* ─────────
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* 0 reset all attributes
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* 1 bold (doubles fg brightness)
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* 4 underline
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* 7 reverse video
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* 22 normal intensity
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* 24 underline off
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* 27 reverse off
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* 30–37 set fg to standard ANSI color 0–7
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* 38;2;r;g;b set fg to 24-bit RGB truecolor
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* 38;5;n set fg to 256-color index
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* 39 reset fg to default
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* 40–47 set bg to standard ANSI color 0–7
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* 48;2;r;g;b set bg to 24-bit RGB truecolor
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* 48;5;n set bg to 256-color index
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* 49 reset bg to default
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* 90–97 set fg to bright ANSI color 8–15
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* 100–107 set bg to bright ANSI color 8–15
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*/
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#ifndef STARKERNEL_VT100_H
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#define STARKERNEL_VT100_H
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#include <stdint.h>
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/* Default terminal colors */
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#define VT100_DEFAULT_FG FB_RGB(0xAA, 0xAA, 0xAA) /* light gray */
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#define VT100_DEFAULT_BG FB_RGB(0x00, 0x00, 0x00) /* black */
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/* -----------------------------------------------------------------------
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* Lifecycle
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* --------------------------------------------------------------------- */
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/**
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* Initialize the VT100 terminal.
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* Must be called after fb_init(). Clears the screen and homes the cursor.
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*/
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void vt100_init(void);
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/**
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* FABRIC-0.md item 4.4j: switch the glyph-draw backend from font_8x16.c to
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* TTF-TEXT's rasterizer for everything drawn from this call onward --
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* boot/POST output before this call stays font_8x16.c, unaffected.
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* Lazily loads the font capsule and its raster cache on first call
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* (no-op on later calls). Recomputes cols/rows for the new cell size and
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* clears the screen, since the two glyph backends use different cell
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* dimensions. TTF point size/cell dimensions decided final by FABRIC-0.md
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* item 4.4m (20px text, 96px REPL strip). No-op if the font capsule
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* fails to load (stays on font_8x16.c; logged, not fatal).
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*/
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void vt100_enable_ttf(void);
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/**
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* FABRIC-0.md item 4.4q: move the REPL scrollback view back/forward by
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* @p n lines and redraw. Offset 0 (the default, and where every call
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* eventually returns to) is the live view -- the same content already on
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* screen. Clamped at both ends: back cannot pass the oldest stored line,
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* forward cannot pass the live view. No-op (including no redraw) if the
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* scrollback buffers failed to allocate at vt100_enable_ttf() time, or
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* before TTF mode is active at all.
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*
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* Known limitation: redraw uses the terminal's current default fg/bg,
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* not each line's original SGR color state at the time it was printed
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* (colors aren't stored per-cell) -- text content is recovered exactly,
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* color is not.
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*/
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void vt100_scroll_back(uint32_t n);
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void vt100_scroll_fwd(uint32_t n);
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/* -----------------------------------------------------------------------
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* Character output
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* --------------------------------------------------------------------- */
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/** Feed one byte into the terminal (handles escape sequences transparently). */
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void vt100_putc(char c);
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/** Feed a null-terminated string. */
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void vt100_puts(const char *s);
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/**
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* FABRIC-0.md item 4.4y-revised: toggle the full-screen vt100 terminal
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* between visible (normal operation) and hidden (graphics mode -- the
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* terminal stops drawing, letting direct framebuffer/TTF-TEXT calls show
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* through undisturbed). Toggling back to visible does a full redraw of
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* the terminal's current on-screen content, restoring it exactly as it
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* was. No-op before TTF mode is active.
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*/
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void vt100_toggle_graphics(void);
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/* Forget everything the terminal has shown: the screen filled with the
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* background, the terminal visible, the on-screen text, the scrollback and
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* the boot-mode snapshot emptied, the cursor home. */
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void vt100_reset(void);
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/**
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* Draw a solid block cursor at the terminal's current position. Static,
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* not blinking. Idempotent -- safe to call after every keystroke, since
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* whatever gets typed next naturally overwrites it. No-op before TTF mode
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* is active or while in graphics mode (vt100_toggle_graphics()).
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*/
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void vt100_draw_cursor(void);
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/**
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* Erases whatever vt100_draw_cursor() last drew, restoring the cell to
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* plain background. Call before moving away from a cursor-drawn cell
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* without also drawing a character there (e.g. Enter/newline). No-op
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* before TTF mode is active or while in graphics mode.
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*/
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void vt100_erase_cursor(void);
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/* -----------------------------------------------------------------------
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* Queries
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* --------------------------------------------------------------------- */
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/** Terminal width in character columns. */
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uint32_t vt100_cols(void);
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/** Terminal height in character rows. */
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uint32_t vt100_rows(void);
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#endif /* STARKERNEL_VT100_H */
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