Add Braille Dump tool

tool/viz/bd.c

@@ -0,0 +1,82 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/stdio/stdio.h"
+
+/**
+ * @fileoverview Braille Dump
+ *
+ * Written by Justine Tunney <jtunney@gmail.com>
+ * https://twitter.com/justinetunney
+ *
+ * Designed by Ange Albertini (corkami)
+ * https://twitter.com/angealbertini
+ *
+ * See also `hexdump -C`.
+ */
+
+const wchar_t K[256] = L"▁☺☻♥♦♣♠•◘○◙♂♀♪♫☼"  /* 0x00 */
+                       L"►◄↕‼¶§▬↨↑↓→←∟↔▲▼"  /* 0x10 */
+                       L" !\"#$%&'()*+,-./" /* 0x20 */
+                       L"0123456789:;<=>?"  /* 0x30 */
+                       L"@ABCDEFGHIJKLMNO"  /* 0x40 */
+                       L"PQRSTUVWXYZ[\\]^_" /* 0x50 */
+                       L"`abcdefghijklmno"  /* 0x60 */
+                       L"pqrstuvwxyz{|}~⌂"  /* 0x70 */
+                       L"█⡀⢀⣀⠠⡠⢠⣠⠄⡄⢄⣄⠤⡤⢤⣤"  /* 0x80 */
+                       L"⠁⡁⢁⣁⠡⡡⢡⣡⠅⡅⢅⣅⠥⡥⢥⣥"  /* 0x90 */
+                       L"⠃⡃⢃⣃⠣⡣⢣⣣⠇⡇⢇⣇⠧⡧⢧⣧"  /* 0xa0 */
+                       L"⠉⡉⢉⣉⠩⡩⢩⣩⠍⡍⢍⣍⠭⡭⢭⣭"  /* 0xb0 */
+                       L"⠊⡊⢊⣊⠪⡪⢪⣪⠎⡎⢎⣎⠮⡮⢮⣮"  /* 0xc0 */
+                       L"⠑⡑⢑⣑⠱⡱⢱⣱⠕⡕⢕⣕⠵⡵⢵⣵"  /* 0xd0 */
+                       L"⠚⡚⢚⣚⠺⡺⢺⣺⠞⡞⢞⣞⠾⡾⢾⣾"  /* 0xe0 */
+                       L"⠛⡛⢛⣛⠻⡻⢻⣻⠟⡟⢟⣟⠿⡿⢿⣿"; /* 0xf0 */
+
+int main(int argc, char *argv[]) {
+  long o;
+  FILE *f;
+  int b, c, i, n;
+  wchar_t B[17], *q;
+  char R[16], A[50], *p;
+  if (!(f = argc > 1 ? fopen(argv[1], "r") : stdin)) {
+    fprintf(stderr, "ERROR: COULD NOT OPEN: %s\n", argv[1]);
+    return 1;
+  }
+  for (b = o = 0;;) {
+    if (!(n = fread(R, 1, 16, f))) break;
+    p = A, q = B;
+    for (c = i = 0; i < n; ++i) {
+      if (i == 8) *p++ = ' ';
+      *p++ = "0123456789abcdef"[(R[i] & 0xF0) >> 4];
+      *p++ = "0123456789abcdef"[(R[i] & 0x0F) >> 0];
+      *p++ = ' ';
+      *q++ = K[R[i] & 255];
+      c |= R[i];
+    }
+    if (c || !o) {
+      *p = *q = b = 0;
+      printf("%08x  %-49s │%ls│\n", o, A, B);
+    } else if (!b) {
+      b = 1;
+      printf("*\n");
+    }
+    o += n;
+  }
+  if (o) printf("%08x\n", o, A, B);
+  return !feof(f);
+}