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Bare metal VGA: use bing & unbing to map between CP437 & UTF-8

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This commit is contained in:
tkchia 2022-09-06 22:30:03 +00:00
parent d4d24482ce
commit 88217deddc
4 changed files with 8 additions and 21 deletions
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4
Makefile
View file

@ -111,12 +111,12 @@ include libc/linux/linux.mk # │ You can manipulate arrays
include libc/tinymath/tinymath.mk # │ You can issue raw system calls
include third_party/compiler_rt/compiler_rt.mk # │
include libc/str/str.mk # │
include libc/vga/vga.mk # │
include third_party/xed/xed.mk # │
include third_party/zlib/zlib.mk # │
include libc/elf/elf.mk # │
include ape/ape.mk # │
include libc/fmt/fmt.mk #─┘
include libc/fmt/fmt.mk # │
include libc/vga/vga.mk #─┘
include libc/calls/calls.mk #─┐
include libc/runtime/runtime.mk # ├──SYSTEMS RUNTIME
include libc/crt/crt.mk # │ You can issue system calls

3
libc/calls/calls.mk
View file

@ -51,8 +51,7 @@ LIBC_CALLS_A_DIRECTDEPS = \
LIBC_STR \
LIBC_STUBS \
LIBC_SYSV_CALLS \
LIBC_SYSV \
LIBC_VGA
LIBC_SYSV
LIBC_CALLS_A_DEPS := \
$(call uniq,$(foreach x,$(LIBC_CALLS_A_DIRECTDEPS),$($(x))))

19
libc/vga/tty.c
View file

@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/bing.internal.h"
#include "libc/fmt/itoa.h"
#include "libc/intrin/bits.h"
#include "libc/intrin/safemacros.internal.h"
@ -107,7 +108,7 @@ void _StartTty(struct Tty *tty, unsigned short yn, unsigned short xn,
if (SetWcs(tty, wcs)) {
size_t n = (size_t)yn * xn, i;
for (i = 0; i < n; ++i)
wcs[i] = kCp437[ccs[i].ch];
wcs[i] = bing(ccs[i].ch, 0);
}
_TtyResetOutputMode(tty);
}
@ -361,20 +362,6 @@ static void TtyAdvance(struct Tty *tty) {
}
}
/*
* FIXME(tkchia): use something more efficient and flexible like unbing(),
* but without creating a circular library dependency.
*/
static int TtyUnBing(wint_t wc) {
uint8_t c;
if (wc >= 0x20 && wc <= 0x7E)
return (int)(uint8_t)wc;
for (c = 0x7F; c != 0x20; ++c)
if (kCp437[c] == wc)
return c;
return -1;
}
static void TtyWriteGlyph(struct Tty *tty, wint_t wc, int w) {
uint8_t attr = TtyGetVgaAttr(tty);
size_t i;
@ -385,7 +372,7 @@ static void TtyWriteGlyph(struct Tty *tty, wint_t wc, int w) {
TtyAdvance(tty);
}
i = tty->y * Xn(tty) + tty->x;
c = TtyUnBing(wc);
c = unbing(wc);
if (c == -1)
c = 0xFE;
tty->ccs[i] = (struct VgaTextCharCell){ c, attr };

3
libc/vga/vga.mk
View file

@ -31,7 +31,8 @@ LIBC_VGA_A_DIRECTDEPS = \
LIBC_SYSV \
LIBC_STR \
LIBC_INTRIN \
LIBC_STUBS
LIBC_STUBS \
LIBC_FMT
LIBC_VGA_A_DEPS := \
$(call uniq,$(foreach x,$(LIBC_VGA_A_DIRECTDEPS),$($(x))))