From 6253e48aadc09bd1af93caa45fe305466977fd0f Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sun, 10 May 2015 18:56:49 -0500
Subject: Git hates me.

---
 toys/other/hexedit.c | 250 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 250 insertions(+)
 create mode 100644 toys/other/hexedit.c

(limited to 'toys/other/hexedit.c')

diff --git a/toys/other/hexedit.c b/toys/other/hexedit.c
new file mode 100644
index 00000000..518755bb
--- /dev/null
+++ b/toys/other/hexedit.c
@@ -0,0 +1,250 @@
+/* hexedit.c - Hexadecimal file editor
+ *
+ * Copyright 2015 Rob Landley <rob@landley.net>
+ *
+ * No standard
+
+USE_HEXEDIT(NEWTOY(hexedit, "<1>1r", TOYFLAG_USR|TOYFLAG_BIN))
+
+config HEXEDIT
+  bool "hexedit"
+  default y
+  help
+    usage: hexedit FILENAME
+
+    Hexadecimal file editor.
+
+    -r	Read only (display but don't edit)
+*/
+
+#define FOR_hexedit
+#include "toys.h"
+
+GLOBALS(
+  char *data;
+  long long len, base;
+  int numlen;
+  unsigned height;
+)
+
+static void esc(char *s)
+{
+  printf("\033[%s", s);
+}
+
+static void jump(int x, int y)
+{
+  char s[32];
+
+  sprintf(s, "%d;%dH", y+1, x+1);
+  esc(s);
+}
+
+static void fix_terminal(void)
+{
+  set_terminal(1, 0, 0);
+  esc("?25h");
+  esc("0m");
+  jump(0, 999);
+}
+
+static void sigttyreset(int i)
+{
+  fix_terminal();
+  // how do I re-raise the signal so it dies with right signal info for wait()?
+  _exit(127);
+}
+
+// Render all characters printable, using color to distinguish.
+static void draw_char(char broiled)
+{
+  if (broiled<32 || broiled>=127) {
+    if (broiled>127) {
+      esc("2m");
+      broiled &= 127;
+    }
+    if (broiled<32 || broiled==127) {
+      esc("7m");
+      if (broiled==127) broiled = 32;
+      else broiled += 64;
+    }
+    printf("%c", broiled);
+    esc("0m");
+  } else printf("%c", broiled);
+}
+
+static void draw_line(long long yy)
+{
+  int x;
+
+  yy = (TT.base+yy)*16;
+
+  if (yy<TT.len) {
+    printf("\r%0*llX ", TT.numlen, yy);
+    for (x=0; x<16; x++) {
+      if (yy+x<TT.len) printf(" %02X", TT.data[yy+x]);
+      else printf("   ");
+    }
+    printf("  ");
+    for (x=0; x<16; x++) draw_char(TT.data[yy+x]);
+  }
+  esc("K");
+}
+
+static void draw_page(void)
+{
+  int y;
+
+  jump(0, 0);
+  for (y = 0; y<TT.height; y++) {
+    if (y) printf("\r\n");
+    draw_line(y);
+  }
+}
+
+// side: 0 = editing left, 1 = editing right, 2 = clear, 3 = read only
+static void highlight(int xx, int yy, int side)
+{
+  char cc = TT.data[16*(TT.base+yy)+xx];
+  int i;
+
+  // Display cursor
+  jump(2+TT.numlen+3*xx, yy);
+  esc("0m");
+  if (side!=2) esc("7m");
+  if (side>1) printf("%02X", cc);
+  else for (i=0; i<2;) {
+    if (side==i) esc("32m");
+    printf("%X", (cc>>(4*(1&++i)))&15);
+  }
+  esc("0m");
+  jump(TT.numlen+17*3+xx, yy);
+  draw_char(cc);
+}
+
+#define KEY_UP 256
+#define KEY_DOWN 257
+#define KEY_RIGHT 258
+#define KEY_LEFT 259
+#define KEY_PGUP 260
+#define KEY_PGDN 261
+#define KEY_HOME 262
+#define KEY_END  263
+#define KEY_INSERT 264
+
+void hexedit_main(void)
+{
+  // up down right left pgup pgdn home end ins
+  char *keys[] = {"\033[A", "\033[B", "\033[C", "\033[D", "\033[5~", "\033[6~",
+                  "\033OH", "\033OF", "\033[2~", 0};
+  long long pos;
+  int x, y, i, side = 0, key, ro = toys.optflags&FLAG_r,
+      fd = xopen(*toys.optargs, ro ? O_RDONLY : O_RDWR);
+
+  TT.height = 25;
+  terminal_size(0, &TT.height);
+  if (TT.height) TT.height--;
+  sigatexit(sigttyreset);
+  esc("0m");
+  esc("?25l");
+  fflush(0);
+  set_terminal(1, 1, 0);
+
+  if ((TT.len = fdlength(fd))<0) error_exit("bad length");
+  if (sizeof(long)==32 && TT.len>SIZE_MAX) TT.len = SIZE_MAX;
+  // count file length hex digits, rounded up to multiple of 4
+  for (pos = TT.len, TT.numlen = 0; pos; pos >>= 4, TT.numlen++);
+  TT.numlen += (4-TT.numlen)&3;
+
+  TT.data = mmap(0, TT.len, PROT_READ|(PROT_WRITE*!ro), MAP_SHARED, fd, 0);
+
+  draw_page();
+
+  y = x = 0;
+  for (;;) {
+    // Get position within file, trimming if we overshot end.
+    pos = 16*(TT.base+y)+x;
+    if (pos>=TT.len) {
+      pos = TT.len-1;
+      x = (TT.len-1)%15;
+    }
+
+    // Display cursor
+    highlight(x, y, ro ? 3 : side);
+    fflush(0);
+
+    // Wait for next key
+    key = scan_key(toybuf, keys, 1);
+    // Exit for q, ctrl-c, ctrl-d, escape, or EOF
+    if (key==-1 || key==3 || key==4 || key==27 || key=='q') break;
+    highlight(x, y, 2);
+
+    if (key>='a' && key<='f') key-=32;
+    if (!ro && ((key>='0' && key<='9') || (key>='A' && key<='F'))) {
+      i = key - '0';
+      if (i>9) i -= 7;
+      TT.data[pos] &= 15<<(4*side);
+      TT.data[pos] |= i<<(4*!side);
+
+      highlight(x, y, ++side);
+      if (side==2) {
+        side = 0;
+        if (++pos<TT.len && ++x==16) {
+          x = 0;
+          if (++y == TT.height) {
+            --y;
+            goto down;
+          }
+        }
+      }
+    }
+    if (key>255) side = 0;
+    if (key==KEY_UP) {
+      if (--y<0) {
+        if (TT.base) {
+          TT.base--;
+          esc("1T");
+          jump(0, TT.height);
+          esc("K");
+          jump(0, 0);
+          draw_line(0);
+        }
+        y = 0;
+      }
+    } else if (key==KEY_DOWN) {
+      if (y == TT.height-1 && pos+32<TT.len) {
+down:
+        TT.base++;
+        esc("1S");
+        jump(0, TT.height-1);
+        draw_line(TT.height-1);
+      }
+      if (pos+16<TT.len && ++y>=TT.height) y--;
+    } else if (key==KEY_RIGHT) {
+      if (x<15 && pos+1<TT.len) x++;
+    } else if (key==KEY_LEFT) {
+      if (x) x--;
+    } else if (key==KEY_PGUP) {
+      TT.base -= TT.height;
+      if (TT.base<0) TT.base = 0;
+      draw_page();
+    } else if (key==KEY_PGDN) {
+      TT.base += TT.height;
+      if ((TT.base*16)>=TT.len) TT.base=(TT.len-1)/16;
+      while ((TT.base+y)*16>=TT.len) y--;
+      if (16*(TT.base+y)+x>=TT.len) x = (TT.len-1)&15;
+      draw_page();
+    } else if (key==KEY_HOME) {
+      TT.base = 0;
+      x = 0;
+      draw_page();
+    } else if (key==KEY_END) {
+      TT.base=(TT.len-1)/16;
+      x = (TT.len-1)&15;
+      draw_page();
+    }
+  }
+  munmap(TT.data, TT.len);
+  close(fd);
+  fix_terminal();
+}
-- 
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