c - 在 C 中使用内联汇编 : Assigning labels in data segment

Question

我正在阅读有关在 DOS 中以 VGA-256 颜色组装打印字符的教程。我正在阅读的教程是用 Pascal 编写的，我对此语言的经验很少，并且我所有的 VGA 程序都是用 C 语言编写的。

我的问题是关于用于访问每个字符的位图的标签。在帕斯卡中，他们有这个:

procedure chr6x7_dat; assembler;
asm
  db  $00,$00,$00,$00,$00,$00,$00,$00,$20,$20,$20,$20,$00,$20,$00,$50
  db  $50,$00,$00,$00,$00,$00,$50,$f8,$50,$50,$f8,$50,$00,$20,$f8,$a0
  db  $f8,$28,$f8,$00,$c8,$d0,$20,$20,$58,$98,$00,$40,$a0,$40,$a8,$90
  db  $68,$00,$20,$40,$00,$00,$00,$00,$00,$20,$40,$40,$40,$40,$20,$00
  db  $20,$10,$10,$10,$10,$20,$00,$50,$20,$f8,$20,$50,$00,$00,$20,$20
  db  $f8,$20,$20,$00,$00,$00,$00,$00,$60,$20,$40,$00,$00,$00,$f8,$00
  db  $00,$00,$00,$00,$00,$00,$00,$60,$60,$00,$00,$08,$10,$20,$40,$80
  db  $00,$70,$88,$98,$a8,$c8,$70,$00,$20,$60,$20,$20,$20,$70,$00,$70
  db  $88,$08,$70,$80,$f8,$00,$f8,$10,$30,$08,$88,$70,$00,$20,$40,$90
  db  $90,$f8,$10,$00,$f8,$80,$f0,$08,$88,$70,$00,$70,$80,$f0,$88,$88
  db  $70,$00,$f8,$08,$10,$20,$20,$20,$00,$70,$88,$70,$88,$88,$70,$00
  db  $70,$88,$88,$78,$08,$70,$00,$30,$30,$00,$00,$30,$30,$00,$30,$30
  db  $00,$30,$10,$20,$00,$00,$10,$20,$40,$20,$10,$00,$00,$f8,$00,$f8
  db  $00,$00,$00,$00,$20,$10,$08,$10,$20,$00,$70,$88,$10,$20,$00,$20
  db  $00,$70,$90,$a8,$b8,$80,$70,$00,$70,$88,$88,$f8,$88,$88,$00,$f0
  db  $88,$f0,$88,$88,$f0,$00,$70,$88,$80,$80,$88,$70,$00,$e0,$90,$88
  db  $88,$90,$e0,$00,$f8,$80,$f0,$80,$80,$f8,$00,$f8,$80,$f0,$80,$80
  db  $80,$00,$70,$88,$80,$98,$88,$70,$00,$88,$88,$f8,$88,$88,$88,$00
  db  $70,$20,$20,$20,$20,$70,$00,$10,$10,$10,$10,$90,$60,$00,$90,$a0
  db  $c0,$a0,$90,$88,$00,$80,$80,$80,$80,$80,$f8,$00,$88,$d8,$a8,$88
  db  $88,$88,$00,$88,$c8,$a8,$98,$88,$88,$00,$70,$88,$88,$88,$88,$70
  db  $00,$f0,$88,$88,$f0,$80,$80,$00,$70,$88,$88,$a8,$98,$70,$00,$f0
  db  $88,$88,$f0,$90,$88,$00,$70,$80,$70,$08,$88,$70,$00,$f8,$20,$20
  db  $20,$20,$20,$00,$88,$88,$88,$88,$88,$70,$00,$88,$88,$88,$88,$50
  db  $20,$00,$88,$88,$88,$a8,$a8,$50,$00,$88,$50,$20,$20,$50,$88,$00
  db  $88,$50,$20,$20,$20,$20,$00,$f8,$10,$20,$40,$80,$f8,$00,$60,$40
  db  $40,$40,$40,$60,$00,$00,$80,$40,$20,$10,$08,$00,$30,$10,$10,$10
  db  $10,$30,$00,$20,$50,$88,$00,$00,$00,$00,$00,$00,$00,$00,$00,$f8
  db  $00,$f8,$f8,$f8,$f8,$f8,$f8
end;

我希望在 C 中有一个类似的标签，这样我就可以在内联汇编命令中访问它，以根据 ASCII 值计算偏移量。但是我不知道如何在 C 中声明上面发布的内容。

谁能帮帮我吗？

Answer 1

与pascal $ char用于定义hexadecimals

如果你想在c中定义它只需创建一个 uint8_t 数组/矩阵，并用 pascal 值初始化它，用 0x 替换 $

$F5 将是 0xF5