doc: redraw a svgbob figure with box drawing characters

Some features were impossible to reproduce with svgbobdoc ^0.3 and
ASCII characters.

Author: yvt

crates/rlsf/src/tlsf.rs

@@ -23,36 +23,36 @@ use crate::{
 /// <center>
 /// ```svgbob
 ///   First level
-///                                                                       FLLEN = 8
-///                               ,-----+-----+-----+-----+-----+-----+-----+-----.
-///         fl_bitmap: FLBitmap = |  0  |  0  |  0  |  1  |  0  |  0  |  0  |  0  |
-///                               +-----+-----+-----+-----+-----+-----+-----+-----+
-///                      min size | 2¹¹ | 2¹⁰ |  2⁹ |  2⁸ |  2⁷ |  2⁶ |  2⁵ |  2⁴ |
-///                               '-----+-----+-----+--+--+-----+-----+-----+-----'
-///                                                    |
-/// ---------------------------------------------------|-----------------------------------------
-///   Second Level                                     |
-///                                                    v                      SLLEN = 8
-///                                  ,-----+-----+-----+-----+-----+-----+-----+-----.
-///        "sl_bitmap[4]: SLBitmap"= |  0  |  0  |  1  |  0  |  0  |  0  |  0  |  0  |
-///                                  +-----+-----+-----+-----+-----+-----+-----+-----+
-///               min size 2⁸(1+n/8) |  7  |  6  |  5  |  4  |  3  |  2  |  1  |  0  |
-///                                  +-----+-----+-----+-----+-----+-----+-----+-----+
-///                       first_free |     |     |  O  |     |     |     |     |     |
-///                                  '-----+-----+--|--+-----+-----+-----+-----+-----'
-///                                                 |
-///                                                 |  size = 416..448
-///                                                 |
-/// ------------------------------------------------|--------------------------------------------
-///   Free blocks                                   |
-///                                                 |
-///             ,-----------------------------------'
-///             | ,---+---+-------.    ,---+---+-------.    ,---+---+-------.
-///             '->-O | O-+-------+---->-O | O-+-------+---->-O |   |       |
-///               +---+---'       |    +---+---'       |    +---+---'       |
-///               |               |    |               |    |               |
-///               |               |    |               |    |               |
-///               '---------------'    '---------------'    '---------------'
+///                                                                       "FLLEN = 8"
+///                               ╭─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────╮
+///        "fl_bitmap: FLBitmap ="│  0  │  0  │  0  │  1  │  0  │  0  │  0  │  0  │
+///                               ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+///                     "min size"│ 2¹¹ │ 2¹⁰ │  2⁹ │  2⁸ │  2⁷ │  2⁶ │  2⁵ │  2⁴ │
+///                               ╰─────┴─────┴─────┴──┬──┴─────┴─────┴─────┴─────╯
+///                                                    │
+/// ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
+///   Second Level                                     │
+///                                                    v                      "SLLEN = 8"
+///                                  ╭─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────╮
+///        "sl_bitmap[4]: SLBitmap ="│  0  │  0  │  1  │  0  │  0  │  0  │  0  │  0  │
+///                                  ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+///              "min size 2⁸(1+n/8)"│  7  │  6  │  5  │  4  │  3  │  2  │  1  │  0  │
+///                                  ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+///                      "first_free"│     │     │  ○  │     │     │     │     │     │
+///                                  ╰─────┴─────┴──┼──┴─────┴─────┴─────┴─────┴─────╯
+///                                                 │
+///                                                 │  "size = 416..448"
+///                                                 │
+/// ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┼ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
+///   Free blocks                                   │
+///                                                 │
+///             ╭───────────────────────────────────╯
+///             │ ╭───┬───┬───────╮    ╭───┬───┬───────╮    ╭───┬───┬───────╮
+///             ╰─┼>○ │ ○─┼───────┼────┼>○ │ ○─┼───────┼────┼>○ │   │       │
+///               ├───┴───╯       │    ├───┴───╯       │    ├───┴───╯       │
+///               │               │    │               │    │               │
+///               │               │    │               │    │               │
+///               ╰───────────────╯    ╰───────────────╯    ╰───────────────╯
 ///                   416 bytes            432 bytes            416 bytes
 /// ```
 /// </center>