From e26bdbec527f698cc80d95272a9dcd3c1c8b33fd Mon Sep 17 00:00:00 2001
From: Justine Tunney <jtunney@gmail.com>
Date: Fri, 5 Mar 2021 06:09:12 -0800
Subject: [PATCH] Make examples folder somewhat more focused

---
 examples/crashreport.c         |  81 +------
 examples/ctrlc.c               |   4 +-
 examples/dinlerp.c             | 376 ---------------------------------
 examples/e820.c                |  44 ----
 examples/exec.c                |  17 --
 examples/findprime.c           |  66 ------
 examples/fork.c                |  18 --
 examples/gui.c                 |  66 +++++-
 examples/hello.c               |   7 -
 examples/hello3.c              |   7 +-
 examples/hello4.c              |   9 +-
 examples/invtsc.c              |  80 -------
 examples/malloc.c              |  19 --
 examples/mappy.c               |  50 -----
 examples/peek.c                |  39 ----
 examples/pipe.c                |  27 ---
 examples/poll.c                |  26 ---
 examples/rawmode.c             |  26 ---
 examples/spawn.c               |  23 --
 examples/statsize.c            |  18 --
 examples/uname.c               |  67 ------
 examples/x86split.c            |  18 ++
 libc/nexgen32e/errno.c         |  13 +-
 libc/nexgen32e/errnolocation.S |  28 ---
 libc/nexgen32e/nexgen32e.mk    |   4 +
 libc/nexgen32e/vcls.S          |  40 ----
 libc/stdio/system.c            |   3 +-
 tool/viz/bf.c                  |  21 +-
 tool/viz/resize.c              | 161 --------------
 29 files changed, 133 insertions(+), 1225 deletions(-)
 delete mode 100644 examples/dinlerp.c
 delete mode 100644 examples/e820.c
 delete mode 100644 examples/exec.c
 delete mode 100644 examples/findprime.c
 delete mode 100644 examples/fork.c
 delete mode 100644 examples/invtsc.c
 delete mode 100644 examples/malloc.c
 delete mode 100644 examples/mappy.c
 delete mode 100644 examples/peek.c
 delete mode 100644 examples/pipe.c
 delete mode 100644 examples/poll.c
 delete mode 100644 examples/rawmode.c
 delete mode 100644 examples/spawn.c
 delete mode 100644 examples/statsize.c
 delete mode 100644 examples/uname.c
 delete mode 100644 libc/nexgen32e/errnolocation.S
 delete mode 100644 libc/nexgen32e/vcls.S
 delete mode 100644 tool/viz/resize.c

diff --git a/examples/crashreport.c b/examples/crashreport.c
index 9cf38a379..24c951083 100644
--- a/examples/crashreport.c
+++ b/examples/crashreport.c
@@ -7,88 +7,23 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
-#include "libc/bits/pushpop.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/ucontext.h"
 #include "libc/log/log.h"
-#include "libc/math.h"
-#include "libc/nt/enum/errormodeflags.h"
-#include "libc/nt/signals.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
 
 /**
- * @fileoverview Demonstrates SEGFAULT via NULL pointer dereference.
+ * @fileoverview How to print backtraces and cpu state on crash.
  *
- * In MODE=dbg mode, UBSAN should catch this and display a backtrace.
- * In most other modes, e.g. MODE=balanced, the oncrash.c sig handler
- * will either launch GDB or display a very fancy report.
- *
- *     make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
- *     o/opt/examples/crashreportdemo.com
+ *     make -j8 -O o//examples/crashreport.com
+ *     o//examples/crashreport.com
  *
  * To prevent the GDB GUI from popping up:
  *
- *     export GDB=""
- *     make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
- *     o/opt/examples/crashreportdemo.com
+ *     export GDB=
+ *     make -j8 -O o//examples/crashreport.com
+ *     o//examples/crashreport.com
  */
 
-int boo;
-
-void boop(void);
-
 int main(int argc, char *argv[]) {
-  int64_t res;
+  volatile int64_t x;
   showcrashreports();
-  res = 0;
-
-  asm volatile("mov\t$0x1111111111111111,%rax\n\t"
-               "mov\t$0x3333333333333333,%rcx\n\t"
-               "mov\t$0x4444444444444444,%rdx\n\t"
-               "mov\t$0x8888888888888888,%r8\n\t"
-               "mov\t$0x9999999999999999,%r9d\n\t"
-               "mov\t$0xaaaaaaaaaaaaaaaa,%r10d\n\t"
-               "mov\t$0xbbbbbbbbbbbbbbbb,%r11d\n\t"
-               "mov\t$0x0000000000000000,%rax\n\t"
-               "movd\t%rax,%xmm0\n\t"
-               "mov\t$0x1111111111111111,%rax\n\t"
-               "push\t%rax\n\t"
-               "push\t%rax\n\t"
-               "movdqu\t(%rsp),%xmm1\n\t"
-               "pop\t%rax\n\t"
-               "pop\t%rax\n\t"
-               "mov\t$0x2222222222220022,%rax\n\t"
-               "movd\t%rax,%xmm2\n\t"
-               "mov\t$0x3333333333333333,%rax\n\t"
-               "movd\t%rax,%xmm3\n\t"
-               "mov\t$0x4444444444444444,%rax\n\t"
-               "movd\t%rax,%xmm4\n\t"
-               "mov\t$0x5555555555555555,%rax\n\t"
-               "movd\t%rax,%xmm5\n\t"
-               "mov\t$0x6666666666666666,%rax\n\t"
-               "movd\t%rax,%xmm6\n\t"
-               "mov\t$0x7777777777777777,%rax\n\t"
-               "movd\t%rax,%xmm7\n\t"
-               "mov\t$0x8888888888888888,%rax\n\t"
-               "movd\t%rax,%xmm8\n\t"
-               "mov\t$0x9999999999999999,%rax\n\t"
-               "movd\t%rax,%xmm9\n\t"
-               "mov\t$0xaaaaaaaaaaaaaaaa,%rax\n\t"
-               "movd\t%rax,%xmm10\n\t"
-               "mov\t$0xbbbbbbbbbbbbbbbb,%rax\n\t"
-               "movd\t%rax,%xmm11\n\t"
-               "mov\t$0xcccccccccccccccc,%rax\n\t"
-               "movd\t%rax,%xmm12\n\t"
-               "mov\t$0xdddddddddddddddd,%rax\n\t"
-               "movd\t%rax,%xmm13\n\t"
-               "mov\t$0xeeeeeeeeeeeeeeee,%rax\n\t"
-               "movd\t%rax,%xmm14\n\t"
-               "mov\t$0xffffffffffffffff,%rax\n\t"
-               "movd\t%rax,%xmm15\n\t"
-               "fldpi\n\t"
-               "xor\t%eax,%eax\n\t"
-               "div\t%eax\n\t");
-
-  return res;
+  return 1 / (x = 0);
 }
diff --git a/examples/ctrlc.c b/examples/ctrlc.c
index 3e2d1404a..2f3483b05 100644
--- a/examples/ctrlc.c
+++ b/examples/ctrlc.c
@@ -32,9 +32,9 @@ int main(int argc, char *argv[]) {
   ssize_t rc;
   size_t got, wrote;
   unsigned char buf[512];
+  struct sigaction saint = {.sa_handler = GotCtrlC};
   fprintf(stderr, "This echos stdio until Ctrl+C is pressed.\n");
-  CHECK_NE(
-      -1, sigaction(SIGINT, &(struct sigaction){.sa_handler = GotCtrlC}, NULL));
+  CHECK_NE(-1, sigaction(SIGINT, &saint, NULL));
   for (;;) {
     rc = read(0, buf, BUFSIZ);
     if (rc != -1) {
diff --git a/examples/dinlerp.c b/examples/dinlerp.c
deleted file mode 100644
index 4f22a0614..000000000
--- a/examples/dinlerp.c
+++ /dev/null
@@ -1,376 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "dsp/core/core.h"
-#include "dsp/core/twixt8.h"
-#include "dsp/scale/scale.h"
-#include "dsp/tty/itoa8.h"
-#include "dsp/tty/quant.h"
-#include "libc/alg/arraylist2.internal.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/ioctl.h"
-#include "libc/calls/struct/stat.h"
-#include "libc/calls/struct/winsize.h"
-#include "libc/limits.h"
-#include "libc/log/check.h"
-#include "libc/log/log.h"
-#include "libc/macros.internal.h"
-#include "libc/math.h"
-#include "libc/mem/mem.h"
-#include "libc/runtime/gc.h"
-#include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/sysv/consts/map.h"
-#include "libc/sysv/consts/o.h"
-#include "libc/sysv/consts/prot.h"
-#include "libc/sysv/consts/termios.h"
-#include "libc/x/x.h"
-#include "third_party/stb/stb_image.h"
-
-/**
- * Hat tips go out to Hornet, CRTC, DESiRE, Hans Petter Jansson, Guihua
- * Cui, Ming Ronnier Luoand anyone else Mister Rogers would describe as
- * the The Helpers Of This World who've helped us learn more about the
- * cool yet exceedingly difficult things possible to do with graphics.
- */
-
-#define DIN99          1
-#define GAMMA          4.1
-#define GAMMA_A        .05
-#define GAMMA_B        50.
-#define GAMMA_C        .055
-#define COLORSPACE_SRC kSrgbD65ToXyzD50
-#define COLORSPACE_TTY kSrgbD65ToXyzD50
-
-#define SQR(X) ((X) * (X))
-#define DEG(X) ((X)*M_PI / 180)
-
-const double kXyzKappa = 24389 / 27.;
-const double kXyzEpsilon = 216 / 24389.;
-
-const double kSrgbD65ToXyzD50[3][3] = {
-    {.4360747, .3850649, .1430804},
-    {.2225045, .7168786, .0606169},
-    {.0139322, .0971045, .7141733},
-};
-
-const double kCieRgbEToXyz[3][3] = {
-    {.4887180, .3106803, .2006017},
-    {.1762044, .8129847, .0108109},
-    {.0000000, .0102048, .9897952},
-};
-
-const unsigned char kShadePct[] = {0300, 0200, 0100};
-const unsigned short kShadeRune[] = {u'▓', u'▒', u'░'};
-
-const unsigned char kAnsiTango[16][3] = {
-    {46, 52, 54},    {204, 0, 0},     {78, 154, 6},   {196, 160, 0},
-    {52, 101, 164},  {117, 80, 123},  {6, 152, 154},  {211, 215, 207},
-    {85, 87, 83},    {239, 41, 41},   {138, 226, 52}, {252, 233, 79},
-    {114, 159, 207}, {173, 127, 168}, {52, 226, 226}, {238, 238, 236},
-};
-
-const unsigned char kCga[16][3] = {
-    {0, 0, 0},     {170, 0, 0},    {0, 170, 0},    {170, 85, 0},
-    {0, 0, 170},   {170, 0, 170},  {0, 170, 170},  {170, 170, 170},
-    {85, 85, 85},  {255, 85, 85},  {85, 255, 85},  {255, 255, 85},
-    {85, 85, 255}, {255, 85, 255}, {85, 255, 255}, {255, 255, 255},
-};
-
-struct Blends {
-  size_t i, n;
-  struct Blend {
-    unsigned char color[4];
-    unsigned char bg, fg;
-    unsigned short rune;
-  } * p;
-} blends;
-
-static double Gamma(double x) {
-  if (x < GAMMA_A) return x / GAMMA_B;
-  return pow(1 / (1 + GAMMA_C) * (x + GAMMA_C), GAMMA);
-}
-
-static void *LoadRgb(double rgb[3], const unsigned char pix[3]) {
-  rgb[0] = Gamma(1. / 255 * pix[0]);
-  rgb[1] = Gamma(1. / 255 * pix[1]);
-  rgb[2] = Gamma(1. / 255 * pix[2]);
-  return rgb;
-}
-
-static double Lab(double x) {
-  return x > kXyzEpsilon ? cbrtf(x) : (kXyzKappa * x + 16) / 116;
-}
-
-static void XyzToLab(double lab[3], const double d50xyz[3]) {
-  double Y, L, a, b;
-  Y = Lab(d50xyz[1]);
-  L = 116 * Y - 16;
-  a = 500 * (Lab(d50xyz[0]) - Y);
-  b = 200 * (Y - Lab(d50xyz[2]));
-  lab[0] = L, lab[1] = a, lab[2] = b;
-}
-
-static void XyzToDin99d(unsigned char din99d[3], const double d50xyz[3]) {
-  double e, f, G, C, h, xyz[3], lab[3];
-  memcpy(xyz, d50xyz, sizeof(xyz));
-  xyz[0] = 1.12f * xyz[0] - .12f * xyz[2];
-  XyzToLab(lab, xyz);
-  e = (+lab[1] * cosf(DEG(50)) + lab[2] * sinf(DEG(50)));
-  f = (-lab[1] * sinf(DEG(50)) + lab[2] + cosf(DEG(50))) * 1.14;
-  G = sqrtf(SQR(e) + SQR(f));
-  C = logf(1 + .06 * G) * 22.5f;
-  h = atan2f(f, e) + DEG(50);
-  h = fmodf(h, DEG(360));
-  if (h < 0) h += DEG(360);
-  din99d[0] = MIN(255, MAX(0, 325.22f * logf(1 + .0036 * lab[0]) * 2.5f));
-  din99d[1] = MIN(255, MAX(0, C * cos(h) * 2.5f + 128));
-  din99d[2] = MIN(255, MAX(0, C * sin(h) * 2.5f + 128));
-}
-
-static void AddColor(int bg, int fg, int rune, int r, int g, int b, int x) {
-  int i;
-  if (blends.i) {
-    for (i = blends.i; --i;) {
-      if (blends.p[i].color[0] == r && blends.p[i].color[1] == g &&
-          blends.p[i].color[2] == b) {
-        return;
-      }
-    }
-  }
-  CHECK_NE(
-      -1,
-      APPEND(&blends.p, &blends.i, &blends.n,
-             (&(struct Blend){
-                 .bg = bg, .fg = fg, .rune = rune, .color = {r, g, b, x}})));
-}
-
-static void AddBlend(int bgxterm, int fgxterm, int rune, int shade,
-                     const unsigned char bgrgb[4],
-                     const unsigned char fgrgb[4]) {
-  AddColor(bgxterm, fgxterm, rune, twixt8(bgrgb[0], fgrgb[0], shade),
-           twixt8(bgrgb[1], fgrgb[1], shade), twixt8(bgrgb[2], fgrgb[2], shade),
-           0);
-}
-
-static void MakeBlends(const unsigned char palette[16][3]) {
-  int r, i, j, k;
-  double rgb[3], xyz[3];
-  unsigned char tab[256][4];
-  unsigned char cube[6] = {0, 0137, 0207, 0257, 0327, 0377};
-  unsigned char seqs[2][2] = {{16, 255}};
-  for (i = 0; i < 16; ++i) {
-    tab[i][0] = palette[i][0];
-    tab[i][1] = palette[i][1];
-    tab[i][2] = palette[i][2];
-    tab[i][3] = i;
-  }
-  for (i = 16; i < 232; ++i) {
-    tab[i][0] = cube[((i - 020) / 044) % 6];
-    tab[i][1] = cube[((i - 020) / 6) % 6];
-    tab[i][2] = cube[(i - 020) % 6];
-    tab[i][3] = i;
-  }
-  for (i = 232; i < 256; ++i) {
-    tab[i][0] = 8 + (i - 232) * 10;
-    tab[i][1] = 8 + (i - 232) * 10;
-    tab[i][2] = 8 + (i - 232) * 10;
-    tab[i][3] = i;
-  }
-#if DIN99
-  for (i = 0; i < 256; ++i) {
-    LoadRgb(rgb, tab[i]);
-    vmatmul3(xyz, rgb, COLORSPACE_TTY);
-    XyzToDin99d(tab[i], xyz);
-  }
-#endif
-  for (r = 0; r < ARRAYLEN(seqs); ++r) {
-    for (i = seqs[r][0]; i <= seqs[r][1]; ++i) {
-      for (j = seqs[r][0]; j <= seqs[r][1]; ++j) {
-        if (i == j) {
-          AddColor(i, 0, 0, tab[i][0], tab[i][1], tab[i][2], 0);
-        } else {
-          for (k = 0; k < ARRAYLEN(kShadeRune); ++k) {
-            AddBlend(i, j, kShadeRune[k], kShadePct[k], tab[i], tab[j]);
-            AddBlend(j, i, kShadeRune[k], kShadePct[k], tab[j], tab[i]);
-          }
-        }
-      }
-    }
-  }
-}
-
-static int PickColor(unsigned char color[3]) {
-  int i, best, least, dist;
-  best = -1;
-  least = INT_MAX;
-  for (i = 0; i < blends.i; ++i) {
-    dist = SQR(blends.p[i].color[0] - color[0]) +
-           SQR(blends.p[i].color[1] - color[1]) +
-           SQR(blends.p[i].color[2] - color[2]);
-    if (dist < least) {
-      least = dist;
-      best = i;
-    }
-  }
-  return best;
-}
-
-static void SetBg(int x) {
-  if (0 <= x && x < 16) {
-    if (x < 8) {
-      x += 40;
-    } else {
-      x -= 8;
-      x *= 100;
-    }
-    printf("\e[%dm", x);
-  } else {
-    /* assert(false); */
-    printf("\e[48;5;%dm", x);
-  }
-}
-
-static void SetFg(int x) {
-  if (0 <= x && x < 16) {
-    if (x < 8) {
-      x += 30;
-    } else {
-      x -= 8;
-      x *= 90;
-    }
-    printf("\e[%dm", x);
-  } else {
-    /* assert(false); */
-    printf("\e[38;5;%dm", x);
-  }
-}
-
-static void PrintImage(long yn, long xn, unsigned char src[4][yn][xn]) {
-  int y, x, c;
-  double rgb[3], xyz[3];
-  unsigned char din99d[3];
-  for (y = 0; y < yn; ++y) {
-    printf("\n");
-    for (x = 0; x < xn; ++x) {
-      din99d[0] = src[0][y][x];
-      din99d[1] = src[1][y][x];
-      din99d[2] = src[2][y][x];
-#if DIN99
-      LoadRgb(rgb, din99d);
-      vmatmul3(xyz, rgb, COLORSPACE_SRC);
-      XyzToDin99d(din99d, xyz);
-#endif
-      c = PickColor(din99d);
-      if (blends.p[c].rune) {
-        SetBg(blends.p[c].bg);
-        SetFg(blends.p[c].fg);
-        printf("%hc", blends.p[c].rune);
-      } else {
-        SetBg(blends.p[c].bg);
-        printf(" ");
-      }
-    }
-    printf("\e[0m");
-  }
-  printf("\r");
-}
-
-static void *Deinterlace(long dcn, long dyn, long dxn,
-                         unsigned char dst[dcn][dyn][dxn], long syw, long sxw,
-                         long scw, const unsigned char src[syw][sxw][scw],
-                         long syn, long sxn, long sy0, long sx0, long sc0) {
-  long y, x, c;
-  for (y = 0; y < dyn; ++y) {
-    for (x = 0; x < dxn; ++x) {
-      for (c = 0; c < dcn; ++c) {
-        dst[c][y][x] = src[sy0 + y][sx0 + x][sc0 + c];
-      }
-    }
-  }
-  return dst;
-}
-
-static void GetTermSize(int out_rows[1], int out_cols[1]) {
-  struct winsize ws;
-  ws.ws_row = 24;
-  ws.ws_col = 80;
-  if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) {
-    ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
-  }
-  out_rows[0] = ws.ws_row;
-  out_cols[0] = ws.ws_col;
-}
-
-static void ProcessImage(long syn, long sxn, unsigned char img[syn][sxn][4]) {
-  int dyn, dxn;
-  double ry, rx;
-  GetTermSize(&dyn, &dxn);
-  ry = syn, rx = sxn;
-  ry /= dyn, rx /= dxn;
-  PrintImage(
-      dyn, dxn,
-      EzGyarados(4, dyn, dxn, gc(xmemalign(32, dyn * dxn * 4)), 4, syn, sxn,
-                 Deinterlace(4, syn, sxn, gc(xmemalign(32, syn * sxn * 4)), syn,
-                             sxn, 4, img, syn, sxn, 0, 0, 0),
-                 0, 4, dyn, dxn, syn, sxn, ry, rx, 0, 0));
-}
-
-static void WithImageFile(const char *path,
-                          void fn(long yn, long xn,
-                                  unsigned char src[yn][xn][4])) {
-  struct stat st;
-  void *map, *data;
-  int fd, yn, xn, cn;
-  CHECK_NE(-1, (fd = open(path, O_RDONLY)), "%s", path);
-  CHECK_NE(-1, fstat(fd, &st));
-  CHECK_GT(st.st_size, 0);
-  CHECK_LE(st.st_size, INT_MAX);
-  CHECK_NE(MAP_FAILED,
-           (map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0)));
-  CHECK_NOTNULL(
-      (data = stbi_load_from_memory(map, st.st_size, &xn, &yn, NULL, 4)), "%s",
-      path);
-  CHECK_NE(-1, munmap(map, st.st_size));
-  CHECK_NE(-1, close(fd));
-  fn(yn, xn, data);
-  free(data);
-}
-
-static void PrintData(void) {
-  int i;
-  for (i = 0; i < blends.i; ++i) {
-    printf("%3d %3d %3d %3d %3d %d\n", blends.p[i].color[0],
-           blends.p[i].color[1], blends.p[i].color[2], blends.p[i].bg,
-           blends.p[i].fg, blends.p[i].rune);
-  }
-}
-
-void *OpenRgbMap(const char *path) {
-  int fd;
-  void *map;
-  size_t size;
-  size = 256 * 256 * 256 * 3;
-  CHECK_NE(-1, (fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0644)));
-  CHECK_NE(-1, ftruncate(fd, size));
-  CHECK_NE(MAP_FAILED,
-           (map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)));
-  CHECK_NE(-1, close(fd));
-  return map;
-}
-
-int main(int argc, char *argv[]) {
-  int i;
-  MakeBlends(kCga);
-  for (i = 1; i < argc; ++i) {
-    WithImageFile(argv[i], ProcessImage);
-  }
-  return 0;
-}
diff --git a/examples/e820.c b/examples/e820.c
deleted file mode 100644
index 4178b1906..000000000
--- a/examples/e820.c
+++ /dev/null
@@ -1,44 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/fmt/itoa.h"
-#include "libc/macros.internal.h"
-#include "libc/runtime/e820.internal.h"
-#include "libc/runtime/pc.internal.h"
-#include "libc/stdio/stdio.h"
-
-const char *DescribeMemoryType(int type) {
-  switch (type) {
-    case kMemoryUsable:
-      return "kMemoryUsable";
-    case kMemoryUnusable:
-      return "kMemoryUnusable";
-    case kMemoryAcpiReclaimable:
-      return "kMemoryAcpiReclaimable";
-    case kMemoryAcpiNvs:
-      return "kMemoryAcpiNvs";
-    case kMemoryBad:
-      return "kMemoryBad";
-    default:
-      return "UNKNOWN";
-  }
-}
-
-int main(int argc, char *argv[]) {
-  int i;
-  const char *ts;
-  struct mman *mm;
-  mm = (struct mman *)(BANE + 0x0500);
-  for (i = 0; i < mm->e820n; ++i) {
-    printf("%p-%p %s\n", mm->e820[i].addr, mm->e820[i].size,
-           DescribeMemoryType(mm->e820[i].type));
-  }
-  for (;;) asm("pause");
-  return 0;
-}
diff --git a/examples/exec.c b/examples/exec.c
deleted file mode 100644
index 4ec8d952d..000000000
--- a/examples/exec.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/calls/calls.h"
-#include "libc/runtime/runtime.h"
-
-int main(int argc, char *argv[]) {
-  if (argc < 2) return 1;
-  execv(argv[1], argv + 1);
-  abort();
-}
diff --git a/examples/findprime.c b/examples/findprime.c
deleted file mode 100644
index bea266f5a..000000000
--- a/examples/findprime.c
+++ /dev/null
@@ -1,66 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/bits/bits.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/struct/itimerval.h"
-#include "libc/fmt/conv.h"
-#include "libc/limits.h"
-#include "libc/log/check.h"
-#include "libc/log/color.internal.h"
-#include "libc/log/log.h"
-#include "libc/math.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/sysv/consts/itimer.h"
-#include "libc/sysv/consts/sig.h"
-#include "libc/time/time.h"
-
-static const struct itimerval kTimer = {{0, 10000}, {0, 10000}}; /* 10ms */
-static volatile bool32 showprogress_;
-static const char *magic_;
-
-void OnInterrupt(int sig) {
-  showprogress_ = true;
-}
-
-void ShowProgress(uintmax_t i, uintmax_t j, uintmax_t n) {
-  fprintf(stderr, "%s%,40jd%,40jd%,40jd\r\n", magic_, i, j, n);
-  showprogress_ = false;
-}
-
-static bool IsPrime(uintmax_t i) {
-  uintmax_t j, n;
-  for (j = 3, n = (unsigned long)floorl(sqrtl(i)); j <= n; j += 2) {
-    if (showprogress_) ShowProgress(i, j, n);
-    if (i % j == 0) return false;
-  }
-  return true;
-}
-
-static void TryNumber(uintmax_t x, uintmax_t i) {
-  if (IsPrime(i)) {
-    printf("%s%,jd%s%,jd\n", "the prime nearest ", x, " is ", i);
-    exit(0);
-  }
-}
-
-int main(int argc, char **argv) {
-  uintmax_t x, i, j;
-  CHECK_EQ(2, argc);
-  signal(SIGALRM, OnInterrupt);
-  setitimer(ITIMER_REAL, &kTimer, NULL);
-  magic_ = cancolor() ? "\e[F\e[K" : "";
-  if ((x = strtoumax(argv[1], NULL, 0)) % 2 == 0) ++x;
-  TryNumber(x, x);
-  for (i = x, j = x;;) {
-    if (i < UINTMAX_MAX) TryNumber(x, i), i += 2;
-    if (j > 1) TryNumber(x, j), j -= 2;
-  }
-}
diff --git a/examples/fork.c b/examples/fork.c
deleted file mode 100644
index 4208e1f8f..000000000
--- a/examples/fork.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/calls/calls.h"
-#include "libc/stdio/stdio.h"
-
-int main(int argc, char *argv[]) {
-  int pid;
-  pid = fork();
-  fprintf(stderr, "fork returned %d\n", pid);
-  return 0;
-}
diff --git a/examples/gui.c b/examples/gui.c
index 5e373dece..27e1cb02b 100644
--- a/examples/gui.c
+++ b/examples/gui.c
@@ -7,9 +7,73 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
+#include "libc/dce.h"
+#include "libc/nexgen32e/nt2sysv.h"
+#include "libc/nt/dll.h"
+#include "libc/nt/enum/cw.h"
 #include "libc/nt/enum/mb.h"
+#include "libc/nt/enum/sw.h"
+#include "libc/nt/enum/wm.h"
+#include "libc/nt/enum/ws.h"
+#include "libc/nt/events.h"
 #include "libc/nt/messagebox.h"
+#include "libc/nt/struct/msg.h"
+#include "libc/nt/struct/wndclass.h"
+#include "libc/nt/windows.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+
+/**
+ * @fileoverview GUI Example
+ *
+ * Cosmopolitan has had a razor sharp focus on making sockets and stdio
+ * work well across platforms. When you call a function like read(), it
+ * will just work on platforms like Windows too. In order to do that we
+ * need to support the WIN32 API, which you can use, but please note it
+ * isn't polyfilled on other platforms in the same way as POSIX APIs.
+ */
+
+static const char16_t kClassName[] = u"cosmopolitan";
+
+static int64_t WindowProc(int64_t hwnd, uint32_t uMsg, uint64_t wParam,
+                          int64_t lParam) {
+  switch (uMsg) {
+    case kNtWmDestroy:
+      PostQuitMessage(0);
+      return 0;
+    default:
+      return DefWindowProc(hwnd, uMsg, wParam, lParam);
+  }
+}
+
+static void Gui(void) {
+  int64_t h;
+  struct NtMsg msg;
+  struct NtWndClass wc;
+  memset(&wc, 0, sizeof(wc));
+  wc.lpfnWndProc = NT2SYSV(WindowProc);
+  wc.hInstance = GetModuleHandle(NULL);
+  wc.lpszClassName = kClassName;
+  RegisterClass(&wc);
+  h = CreateWindowEx(0, kClassName, u"Hello Cosmopolitan",
+                     kNtWsOverlappedwindow, kNtCwUsedefault, kNtCwUsedefault,
+                     kNtCwUsedefault, kNtCwUsedefault, 0, 0, wc.hInstance, 0);
+  ShowWindow(h, kNtSwNormal);
+  /*
+   * NOTE: Cosmopolitan linker script is hard-coded to change the
+   *       subsystem from CUI to GUI when GetMessage() is linked.
+   */
+  while (GetMessage(&msg, 0, 0, 0)) {
+    TranslateMessage(&msg);
+    DispatchMessage(&msg);
+  }
+}
 
 int main(int argc, char *argv[]) {
-  return MessageBox(0, u"hello world", u"cosmopolitan", kNtMbOk) ? 0 : 1;
+  if (!IsWindows()) {
+    fputs("Sorry! This GUI demo only runs on Windows\n", stderr);
+    fputs("https://github.com/jart/cosmopolitan/issues/57\n", stderr);
+    return 1;
+  }
+  Gui();
 }
diff --git a/examples/hello.c b/examples/hello.c
index 90d952c75..8486ab30a 100644
--- a/examples/hello.c
+++ b/examples/hello.c
@@ -10,13 +10,6 @@
 #include "libc/stdio/stdio.h"
 
 int main() {
-  /*
-   * Cosmopolitan's "Hello World" demonstrates a best practice.
-   *
-   * Since we conditionally link heavyweight features based on which
-   * characters are present in the format string, it's a good idea to
-   * have that string consist solely of directives.
-   */
   printf("%s\n", "hello world");
   return 0;
 }
diff --git a/examples/hello3.c b/examples/hello3.c
index 49896be52..29a69466f 100644
--- a/examples/hello3.c
+++ b/examples/hello3.c
@@ -8,12 +8,9 @@
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
 #include "libc/errno.h"
-#include "libc/runtime/gc.h"
-#include "libc/calls/calls.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/x/x.h"
+#include "libc/stdio/stdio.h"
 
 int main() {
-  dprintf(STDOUT_FILENO, "%s\n", gc(xasprintf("%'s", "(╯°□°)╯︵' ┻━┻")));
+  printf("%s \n", "hello world");
   return errno;
 }
diff --git a/examples/hello4.c b/examples/hello4.c
index 29a69466f..7a104c40f 100644
--- a/examples/hello4.c
+++ b/examples/hello4.c
@@ -10,7 +10,12 @@
 #include "libc/errno.h"
 #include "libc/stdio/stdio.h"
 
-int main() {
-  printf("%s \n", "hello world");
+int main(int argc, char *argv[]) {
+  printf("abcdefghijklmnopqrstuvwxyz "
+         "ABCDEFGHIJKLMNOPQRSTUVWXYZ "
+         "!@#$$%%^&*(){}%%* "
+         "0123456789 "
+         "%3d\n",
+         argc);
   return errno;
 }
diff --git a/examples/invtsc.c b/examples/invtsc.c
deleted file mode 100644
index bda7e3062..000000000
--- a/examples/invtsc.c
+++ /dev/null
@@ -1,80 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/bits/bits.h"
-#include "libc/dce.h"
-#include "libc/log/check.h"
-#include "libc/nexgen32e/rdtsc.h"
-#include "libc/nexgen32e/x86feature.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/sysv/consts/clock.h"
-#include "libc/sysv/consts/sig.h"
-#include "libc/time/time.h"
-#include "libc/x/x.h"
-#include "third_party/gdtoa/gdtoa.h"
-
-/**
- * @fileoverview Measure CPU clock mystery constants.
- * @note CPUID EAX=15h/16h is a joke
- */
-
-const long double kInterval = 0.001L;
-
-long double start_;
-char dtoabuf_[3][32];
-volatile bool isdone_;
-
-void OnCtrlC(int sig) {
-  isdone_ = true;
-}
-
-long double now(void) {
-  return dtime(CLOCK_MONOTONIC);
-}
-
-long double GetSample(void) {
-  uint64_t tick1, tick2;
-  long double time1, time2;
-  time1 = now();
-  tick1 = rdtsc();
-  nanosleep(&(struct timespec){0, 100000}, NULL);
-  time2 = now();
-  tick2 = rdtsc();
-  return ((time2 - time1) * 1e9L) / (long double)(tick2 - tick1);
-}
-
-void MeasureNanosecondsPerAlwaysRunningTimerCycle(void) {
-  int i;
-  long double avg, samp, elapsed;
-  start_ = now();
-  for (i = 1, avg = 1.0L; !isdone_; ++i) {
-    samp = GetSample();
-    avg += (samp - avg) / i;
-    dsleep(kInterval);
-    elapsed = now() - start_;
-    g_xfmt_p(dtoabuf_[0], &avg, 15, 32, 0);
-    g_xfmt_p(dtoabuf_[1], &samp, 15, 32, 0);
-    g_xfmt_p(dtoabuf_[2], &elapsed, 15, 32, 0);
-    printf("1c = %sns (last=%sns spent=%ss)\n", dtoabuf_[0], dtoabuf_[1],
-           dtoabuf_[2]);
-  }
-}
-
-int main(int argc, char *argv[]) {
-  if (!X86_HAVE(INVTSC)) {
-    fprintf(stderr, "warning: html can reprogram your microcode\n");
-  }
-  if (X86_HAVE(HYPERVISOR)) {
-    fprintf(stderr, "warning: virtual machine rdtsc isn't great\n");
-  }
-  CHECK_NE(-1, xsigaction(SIGINT, OnCtrlC, 0, 0, NULL));
-  MeasureNanosecondsPerAlwaysRunningTimerCycle();
-  return 0;
-}
diff --git a/examples/malloc.c b/examples/malloc.c
deleted file mode 100644
index 60e8f65fa..000000000
--- a/examples/malloc.c
+++ /dev/null
@@ -1,19 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/mem/mem.h"
-#include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
-
-int main(int argc, char *argv[]) {
-  char *s = malloc(1024 * 1024 * 2 + argc);
-  strcpy(s, "hello");
-  puts(s);
-  return 0;
-}
diff --git a/examples/mappy.c b/examples/mappy.c
deleted file mode 100644
index e98096885..000000000
--- a/examples/mappy.c
+++ /dev/null
@@ -1,50 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/bits/bits.h"
-#include "libc/calls/calls.h"
-#include "libc/macros.internal.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/sysv/consts/map.h"
-#include "libc/sysv/consts/prot.h"
-
-/*
-  OpenBSD
-  00025ff61000 000000000000 65536
-  00026cf1d000 00000cfbc000 65536
-  000254d83000 ffffe7e66000 65536
-  0002c7bde000 000072e5b000 65536
-  000253ff9000 ffff8c41b000 65536
-  0002e96f3000 0000956fa000 65536
-  000236346000 ffff4cc53000 65536
-  0002ce744000 0000983fe000 65536
-  0002fe0b8000 00002f974000 65536
-  000225cd7000 ffff27c1f000 65536
-*/
-
-struct Mapping {
-  uint8_t *map;
-  size_t mapsize;
-};
-
-int main(int argc, char *argv[]) {
-  size_t i;
-  struct Mapping m[10];
-  for (i = 0; i < ARRAYLEN(m); ++i) {
-    m[i].mapsize = FRAMESIZE;
-    m[i].map = mmap(NULL, m[i].mapsize, PROT_READ | PROT_WRITE,
-                    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-  }
-  for (i = 0; i < ARRAYLEN(m); ++i) {
-    printf("%p %p %zu\n", m[i].map, i ? m[i].map - m[i - 1].map : 0,
-           m[i].mapsize);
-  }
-  return 0;
-}
diff --git a/examples/peek.c b/examples/peek.c
deleted file mode 100644
index a7d90bccb..000000000
--- a/examples/peek.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*-*- 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 2020 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/fmt/conv.h"
-#include "libc/runtime/interruptiblecall.h"
-#include "libc/stdio/stdio.h"
-#include "libc/sysv/consts/sig.h"
-
-struct InterruptibleCall icall;
-
-static intptr_t peek(intptr_t *addr) {
-  return *addr;
-}
-
-int main(int argc, char *argv[]) {
-  int i;
-  for (i = 1; i < argc; ++i) {
-    intptr_t addr = strtoul(argv[i], NULL, 0);
-    icall.sig = SIGSEGV;
-    printf("%#p → %#lx\n", addr,
-           interruptiblecall(&icall, (void *)peek, addr, 0, 0, 0));
-  }
-  return 0;
-}
diff --git a/examples/pipe.c b/examples/pipe.c
deleted file mode 100644
index 1cbb520cf..000000000
--- a/examples/pipe.c
+++ /dev/null
@@ -1,27 +0,0 @@
-/*-*- 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 2020 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/calls/calls.h"
-#include "libc/stdio/stdio.h"
-
-int main(int argc, char *argv[]) {
-  int pipefds[2] = {-1, -1};
-  int rc = pipe(pipefds);
-  printf("%d → %ld %ld\n", rc, pipefds[0], pipefds[1]);
-  return 0;
-}
diff --git a/examples/poll.c b/examples/poll.c
deleted file mode 100644
index 024e5f2ce..000000000
--- a/examples/poll.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/bits/bits.h"
-#include "libc/macros.internal.h"
-#include "libc/sock/sock.h"
-#include "libc/stdio/stdio.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/sysv/consts/poll.h"
-
-int main(int argc, char *argv[]) {
-  int rc;
-  int pollms = 1;
-  struct pollfd fds[] = {{-1, 0}, {STDIN_FILENO, POLLIN}};
-  if ((rc = poll(fds, ARRAYLEN(fds), pollms)) != -1) {
-    printf("toto=%d\n", rc);
-    return 0;
-  }
-  return 0;
-}
diff --git a/examples/rawmode.c b/examples/rawmode.c
deleted file mode 100644
index 0bfcc799b..000000000
--- a/examples/rawmode.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "dsp/tty/tty.h"
-#include "libc/log/log.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/time/time.h"
-
-int main(int argc, char *argv[]) {
-  setenv("GDB", "nopenopenope", true);
-  showcrashreports();
-  ttyraw(kTtyLfToCrLf | kTtySigs);
-  printf("hi\n"), sleep(1);
-  if (argc > 1 && strstr(argv[1], "crash")) abort();
-  printf("there\n"), sleep(1);
-  return 0;
-}
diff --git a/examples/spawn.c b/examples/spawn.c
deleted file mode 100644
index 4669547d8..000000000
--- a/examples/spawn.c
+++ /dev/null
@@ -1,23 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/calls/calls.h"
-#include "libc/runtime/runtime.h"
-
-int main(int argc, char *argv[]) {
-  int pid, wstatus;
-  if (argc < 2) return 1;
-  pid = fork();
-  if (!pid) {
-    execv(argv[1], argv + 1);
-    abort();
-  }
-  waitpid(pid, &wstatus, 0);
-  return WEXITSTATUS(wstatus);
-}
diff --git a/examples/statsize.c b/examples/statsize.c
deleted file mode 100644
index 4ed9c6bfe..000000000
--- a/examples/statsize.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/calls/calls.h"
-#include "libc/calls/struct/stat.h"
-
-int main(int argc, char *argv[]) {
-  struct stat st;
-  st.st_size = -1;
-  stat(argv[1], &st);
-  return st.st_size;
-}
diff --git a/examples/uname.c b/examples/uname.c
deleted file mode 100644
index 6fd32d0e8..000000000
--- a/examples/uname.c
+++ /dev/null
@@ -1,67 +0,0 @@
-#if 0
-/*─────────────────────────────────────────────────────────────────╗
-│ To the extent possible under law, Justine Tunney has waived      │
-│ all copyright and related or neighboring rights to this file,    │
-│ as it is written in the following disclaimers:                   │
-│   • http://unlicense.org/                                        │
-│   • http://creativecommons.org/publicdomain/zero/1.0/            │
-╚─────────────────────────────────────────────────────────────────*/
-#endif
-#include "libc/log/log.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/calls/struct/utsname.h"
-#include "libc/calls/calls.h"
-#include "libc/sysv/consts/exit.h"
-#include "third_party/getopt/getopt.h"
-
-int main(int argc, char *argv[]) {
-  unsigned need = 0;
-  int opt;
-  while ((opt = getopt(argc, argv, "hasnrvmd")) != -1) {
-    switch (opt) {
-      case 'a':
-        need |= 0b111111;
-        break;
-      case 's':
-        need |= 0b000001;
-        break;
-      case 'n':
-        need |= 0b000010;
-        break;
-      case 'r':
-        need |= 0b000100;
-        break;
-      case 'v':
-        need |= 0b001000;
-        break;
-      case 'm':
-        need |= 0b010000;
-        break;
-      case 'd':
-        need |= 0b100000;
-        break;
-      default: /* -? or -h */
-        fprintf(stderr, "%s: %s [%s]\n%s", "Usage", argv[0], "FLAGS",
-                "  -a\tprint all\n"
-                "  -s\tprint sysname\n"
-                "  -n\tprint nodename\n"
-                "  -r\tprint release\n"
-                "  -v\tprint version\n"
-                "  -m\tprint machine\n"
-                "  -d\tprint domainname\n");
-        exit(EXIT_FAILURE);
-    }
-  }
-  if (!need) need = 0b000001;
-  struct utsname data;
-  if (uname(&data) == -1) perror("uname"), exit(EXIT_FAILURE);
-  if (need & 0b000001) printf("%s ", data.sysname);
-  if (need & 0b000010) printf("%s ", data.nodename);
-  if (need & 0b000100) printf("%s ", data.release);
-  if (need & 0b001000) printf("%s ", data.version);
-  if (need & 0b010000) printf("%s ", data.machine);
-  if (need & 0b100000) printf("%s ", data.domainname);
-  printf("\n");
-  return 0;
-}
diff --git a/examples/x86split.c b/examples/x86split.c
index a5bf01052..528efe32a 100644
--- a/examples/x86split.c
+++ b/examples/x86split.c
@@ -16,6 +16,24 @@
 
 /**
  * @fileoverview x86 instruction length decoder by way of hex pipe.
+ *
+ * Here's an example of how you can use it to decode a NOP stream:
+ *
+ *     $ make -j8 o//examples/x86split.com
+ *     $ echo 909090 | o//examples/x86split.com
+ *     90
+ *     90
+ *     90
+ *
+ * If there was a XOR instruction in there, it'd do this:
+ *
+ *     $ make -j8 o//examples/x86split.com
+ *     $ echo 904531FF90 | o//examples/x86split.com
+ *     90                     # NOP
+ *     4531FF                 # XOR R15D,R15D
+ *     90                     # NOP
+ *
+ * Now that you're able to split x86 instructions the rest is easy.
  */
 
 int fgethex(FILE *f) {
diff --git a/libc/nexgen32e/errno.c b/libc/nexgen32e/errno.c
index f175f75f8..e0ac0743b 100644
--- a/libc/nexgen32e/errno.c
+++ b/libc/nexgen32e/errno.c
@@ -16,9 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/nexgen32e/nexgen32e.h"
-
-STATIC_YOINK("__errno_location"); /* needed by gdb */
+#include "libc/errno.h"
 
 /**
  * Global variable for last error.
@@ -33,3 +31,12 @@ STATIC_YOINK("__errno_location"); /* needed by gdb */
  * @see	__errno_location() stable abi
  */
 int errno;
+
+/**
+ * Returns address of errno.
+ *
+ * @note this is needed by gdb
+ */
+int *__errno_location(void) {
+  return &errno;
+}
diff --git a/libc/nexgen32e/errnolocation.S b/libc/nexgen32e/errnolocation.S
deleted file mode 100644
index 1b9ccbc0a..000000000
--- a/libc/nexgen32e/errnolocation.S
+++ /dev/null
@@ -1,28 +0,0 @@
-/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-│
-│vi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 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/macros.internal.h"
-.source	__FILE__
-.keep.text # gdb needs it
-
-//	Returns address of errno variable.
-//	@note	this isn't a universal definition
-__errno_location:
-	ezlea	errno,ax
-	ret
-	.endfn	__errno_location,globl,hidden
diff --git a/libc/nexgen32e/nexgen32e.mk b/libc/nexgen32e/nexgen32e.mk
index 5a9571f73..3cc690831 100644
--- a/libc/nexgen32e/nexgen32e.mk
+++ b/libc/nexgen32e/nexgen32e.mk
@@ -47,6 +47,10 @@ o/$(MODE)/libc/nexgen32e/tinystrncmp.ncabi.o:		\
 		OVERRIDE_CFLAGS +=			\
 			-Os
 
+o/$(MODE)/libc/nexgen32e/errno.o:			\
+		OVERRIDE_CFLAGS +=			\
+			$(NO_MAGIC)
+
 LIBC_NEXGEN32E_LIBS = $(foreach x,$(LIBC_NEXGEN32E_ARTIFACTS),$($(x)))
 LIBC_NEXGEN32E_SRCS = $(foreach x,$(LIBC_NEXGEN32E_ARTIFACTS),$($(x)_SRCS))
 LIBC_NEXGEN32E_HDRS = $(foreach x,$(LIBC_NEXGEN32E_ARTIFACTS),$($(x)_HDRS))
diff --git a/libc/nexgen32e/vcls.S b/libc/nexgen32e/vcls.S
deleted file mode 100644
index a5a308566..000000000
--- a/libc/nexgen32e/vcls.S
+++ /dev/null
@@ -1,40 +0,0 @@
-/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-│
-│vi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 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 "ape/macros.internal.h"
-#include "libc/nexgen32e/vidya.internal.h"
-#include "libc/notice.inc"
-.real
-.code16 # ∩ .code32 ∩ .code64
-.source	__FILE__
-
-//	Clears display page.
-//
-//	@param	es:di arbitrary address within video page
-//	@return	es:ax starting address
-//	@mode	long,legacy,real
-vcls:	xchg	%di,%ax
-	bband	VIDYA_REWIND,%ah,%al
-	xchg	%di,%ax
-	push	%di
-	bbmov	VIDYA_SIZE,%cx,%ch,%cl
-	xor	%al,%al
-	rep stosb
-	pop	%ax
-	ret
-	.endfn	vcls,globl
diff --git a/libc/stdio/system.c b/libc/stdio/system.c
index ae41a1833..ef58b0fc3 100644
--- a/libc/stdio/system.c
+++ b/libc/stdio/system.c
@@ -53,8 +53,7 @@ int system(const char *cmdline) {
   sigemptyset(&chldmask);
   sigaddset(&chldmask, SIGCHLD);
   sigprocmask(SIG_BLOCK, &chldmask, &savemask);
-  pid = fork();
-  if (!pid) {
+  if (!(pid = fork())) {
     sigaction(SIGINT, &saveint, NULL);
     sigaction(SIGQUIT, &savequit, NULL);
     sigprocmask(SIG_SETMASK, &savemask, NULL);
diff --git a/tool/viz/bf.c b/tool/viz/bf.c
index 5ead78f6d..ad2e8c582 100644
--- a/tool/viz/bf.c
+++ b/tool/viz/bf.c
@@ -16,8 +16,12 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/bits/bits.h"
 #include "libc/calls/calls.h"
+#include "libc/calls/struct/stat.h"
 #include "libc/fmt/itoa.h"
+#include "libc/macros.internal.h"
+#include "libc/nexgen32e/bsr.h"
 #include "libc/runtime/runtime.h"
 #include "libc/str/str.h"
 #include "libc/str/tpenc.h"
@@ -33,15 +37,22 @@
 void bf(int fd) {
   ssize_t rc;
   uint64_t w;
-  int c, fg, fg2;
+  struct stat st;
   size_t i, n, o;
+  int c, fg, fg2, bits;
   char ibuf[W], obuf[12 + 1 + W * 6 + 1 + W * (2 + 11) + 11 + 1];
   o = 0;
+  if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode) && st.st_size) {
+    bits = bsr(roundup2pow(st.st_size));
+    bits = ROUNDUP(bits, 4);
+  } else {
+    bits = 48;
+  }
   do {
     if ((rc = read(fd, ibuf, W)) == -1) exit(2);
     if (rc) {
       n = 0;
-      n += uint64toarray_fixed16(o, obuf + n, 48);
+      n += uint64toarray_fixed16(o, obuf + n, bits);
       o += rc;
       obuf[n++] = ' ';
       for (i = 0; i < rc; ++i) {
@@ -65,21 +76,21 @@ void bf(int fd) {
         }
         if (fg2 != fg) {
           fg = fg2;
-          obuf[n++] = '\e';
+          obuf[n++] = 033;
           obuf[n++] = '[';
           obuf[n++] = '3';
           obuf[n++] = '8';
           obuf[n++] = ';';
           obuf[n++] = '5';
           obuf[n++] = ';';
-          n += int64toarray_radix10(o, obuf + n);
+          n += int64toarray_radix10(fg, obuf + n);
           obuf[n++] = 'm';
         }
         obuf[n++] = "0123456789abcdef"[c >> 4];
         obuf[n++] = "0123456789abcdef"[c & 15];
         /* obuf[n++] = ' '; */
       }
-      obuf[n++] = '\e';
+      obuf[n++] = 033;
       obuf[n++] = '[';
       obuf[n++] = '0';
       obuf[n++] = 'm';
diff --git a/tool/viz/resize.c b/tool/viz/resize.c
deleted file mode 100644
index 1b6000324..000000000
--- a/tool/viz/resize.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/*-*- 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 2020 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/calls/calls.h"
-#include "libc/calls/ioctl.h"
-#include "libc/calls/struct/stat.h"
-#include "libc/calls/termios.h"
-#include "libc/fmt/fmt.h"
-#include "libc/log/check.h"
-#include "libc/log/log.h"
-#include "libc/mem/mem.h"
-#include "libc/runtime/gc.h"
-#include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/sysv/consts/map.h"
-#include "libc/sysv/consts/o.h"
-#include "libc/sysv/consts/prot.h"
-#include "third_party/zlib/zlib.h"
-
-void ProcessFile(const char *path) {
-  /* int fd; */
-  /* void *map; */
-  /* z_stream zs; */
-  /* uint8_t *rgb; */
-  /* struct stat st; */
-  /* const char *ext; */
-  /* int width, height; */
-  /* size_t pathlen, rgbbytes; */
-  /* CHECK_NOTNULL((ext = memrchr(path, '-', (pathlen = strlen(path))))); */
-  /* CHECK_EQ(2, sscanf(ext, "-%dx%d.rgb.gz", &width, &height)); */
-  /* CHECK_NE(-1, (fd = open(path, O_RDONLY))); */
-  /* CHECK_NE(-1, fstat(fd, &st)); */
-  /* CHECK_NOTNULL((rgb = malloc((rgbbytes = width * height * 3)))); */
-  /* CHECK_NE(MAP_FAILED, */
-  /*          (map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0))); */
-  /* zs.next_in = map; */
-  /* zs.zalloc = Z_NULL; */
-  /* zs.zfree = Z_NULL; */
-  /* zs.avail_in = st.st_size; */
-  /* zs.total_in = st.st_size; */
-  /* zs.next_out = rgb; */
-  /* zs.avail_out = rgbbytes; */
-  /* zs.total_out = rgbbytes; */
-  /* CHECK_EQ(Z_OK, inflateInit2(&zs, 16 + MAX_WBITS)); */
-  /* CHECK_NE(Z_BUF_ERROR, inflate(&zs, Z_NO_FLUSH)); */
-  /* CHECK_EQ(Z_OK, inflateEnd(&zs)); */
-
-  /* struct winsize ws; */
-  /* struct Resizer *rz; */
-  /* ws.ws_row = 25; */
-  /* ws.ws_col = 80; */
-  /* LOGIFNEG1(ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws)); */
-  /* ws.ws_row *= 2; */
-  /* ws.ws_col /= 2; */
-  /* ws.ws_row /= 2; */
-
-  /* int y, x, i; */
-  /* uint8_t *rgb2, *u8p; */
-  /* float *frgba, *frgba2, *f32p; */
-  /* CHECK_NOTNULL((rz = NewResizer())); */
-  /* CHECK_NOTNULL((frgba = malloc(width * height * 4 * sizeof(float)))); */
-  /* CHECK_NOTNULL((frgba2 = malloc(ws.ws_row * ws.ws_col * 4 *
-   * sizeof(float)))); */
-  /* CHECK_NOTNULL((rgb2 = (uint8_t *)malloc(ws.ws_row * ws.ws_col * 3))); */
-  /* for (u8p = rgb, f32p = frgba, y = 0; y < height; ++y) { */
-  /*   for (x = 0; x < width; ++x, u8p += 3, f32p += 4) { */
-  /*     f32p[0] = (int)u8p[0], f32p[1] = (int)u8p[1]; */
-  /*     f32p[2] = (int)u8p[2], f32p[3] = 1; */
-  /*     for (i = 0; i < 4; ++i) f32p[i] /= 256; */
-  /*   } */
-  /* } */
-  /* ResizeImage(rz, frgba, ws.ws_row, ws.ws_col, frgba, height, width); */
-  /* for (u8p = rgb2, f32p = frgba2, y = 0; y < ws.ws_row; ++y) { */
-  /*   for (x = 0; x < ws.ws_col; ++x, u8p += 3, f32p += 4) { */
-  /*     for (i = 0; i < 4; ++i) f32p[i] *= 256; */
-  /*     u8p[0] = (int)f32p[0]; */
-  /*     u8p[1] = (int)f32p[1]; */
-  /*     u8p[2] = (int)f32p[2]; */
-  /*   } */
-  /* } */
-  /* free(frgba2); */
-  /* free(frgba); */
-
-  /* int y, x; */
-  /* uint8_t *rgb2; */
-  /* CHECK_NOTNULL((rz = NewResizer())); */
-  /* CHECK_NOTNULL((rgb2 = (uint8_t *)malloc(ws.ws_row * ws.ws_col * 3))); */
-  /* printf("%d %d %d %d %d %d\n", rgb2, ws.ws_row, ws.ws_col, rgb, height,
-   * width); */
-  /* ResizeImage8(rz, rgb2, ws.ws_row, ws.ws_col, rgb, height, width); */
-
-  /* uint8_t *p; */
-  /* /\* printf("\e[H"); *\/ */
-  /* for (p = rgb2, y = 0; y < ws.ws_row / 2; ++y) { */
-  /*   for (x = 0; x < ws.ws_col; ++x, p += 3) { */
-  /*     printf("\e[48;2;%hhu;%hhu;%hhu;38;2;%hhu;%hhu;%hhum▄", p[0], p[1],
-   * p[2], */
-  /*            p[ws.ws_col * 3 + 0], p[ws.ws_col * 3 + 1], p[ws.ws_col * 3 +
-   * 2]); */
-  /*   } */
-  /*   for (x = 0; x < ws.ws_col; ++x, p += 3) { */
-  /*   } */
-  /*   printf("\n"); */
-  /* } */
-  /* printf("\e[0m"); */
-
-  /* uint8_t *rgb2; */
-  /* struct winsize ws; */
-  /* struct Resizer *rz; */
-  /* ws.ws_row = 25; */
-  /* ws.ws_col = 80; */
-  /* LOGIFNEG1(ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws)); */
-  /* CHECK_NOTNULL((rz = NewResizer())); */
-  /* CHECK_NOTNULL((rgb2 = malloc(ws.ws_row * ws.ws_col * 3))); */
-  /* printf("%d %d %d %d %d %d\n", rgb2, ws.ws_row, ws.ws_col, rgb, height,
-   * width); */
-  /* ResizeImage8(rz, rgb2, ws.ws_row, ws.ws_col, rgb, height, width); */
-
-  /* int y, x; */
-  /* uint8_t *p; */
-  /* printf("\e[H"); */
-  /* for (p = rgb2, y = 0; y < ws.ws_row; ++y) { */
-  /*   for (x = 0; x < ws.ws_col; ++x, p += 3) { */
-  /*     if (p[0] || p[1] || p[2]) { */
-  /*       printf("\e[48;2;%hhu;%hhu;%hhum ", p[0], p[1], p[2]); */
-  /*     } */
-  /*   } */
-  /*   printf("\n"); */
-  /* } */
-  /* printf("\e[0m"); */
-
-  /* CHECK_NE(-1, munmap(map, st.st_size)); */
-  /* CHECK_NE(-1, close(fd)); */
-  /* FreeResizer(rz); */
-  /* free(rgb2); */
-  /* free(rgb); */
-}
-
-int main(int argc, char *argv[]) {
-  int i;
-  for (i = 1; i < argc; ++i) {
-    ProcessFile(argv[i]);
-  }
-  return 0;
-}