Added UNIX version

unix/.gitignore

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+images
+xmandelbrot
+mandelbrot
+*~

unix/Makefile

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+CC=cc
+CCOPTS=-Wall -Wpedantic
+
+all: mandelbrot xmandelbrot
+
+mandelbrot: mandelbrot.c
+	$(CC) $(CCOPTS) -o mandelbrot mandelbrot.c -lcurses
+
+xmandelbrot: xmandelbrot.c
+	$(CC) $(CCOPTS) -o xmandelbrot xmandelbrot.c -lX11
+
+clean:
+	rm -f *.o
+	rm -f mandelbrot
+	rm -f xmandelbrot

unix/mandelbrot.c

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+/*
+ * Mandelbrot for UNIX.
+ * Copyright 2025, Andrew C. Young <[email protected]>
+ * License: MIT
+ *
+ * To compile: cc -o mandelbrot mandelbrot.c -lcurses
+ *
+ * This program was written on a Macintosh Quadra 700 running A/UX 3.1.
+ * A/UX was Apple's first version of UNIX, based on both SYSV and BSD.
+ * A/UX 3.1 was released in 1994, and its default C compiler did not
+ * yet support the ANSI standard. As such, this program is written to
+ * work with earlier K&R versions of C. It should also compile with GCC.
+ *
+ * It uses the curses library for screen manipulation, but it should
+ * also work with the later ncurses library.
+ *
+ * My classic Mac resources can be found at m68k.club (www,gopher).
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+/* Used to write to the screen */
+#include <curses.h>
+
+/* Used to measure run time */
+#include <sys/types.h>
+#include <sys/times.h>
+
+#define MAX_ITERATIONS 16
+
+int *pixels = 0;
+int cols = 80;
+int lines = 24;
+
+char symbols[] = {' ','-','+','=','\\','|','/','*',
+                  '#','3','8','B','=','#','+','.'};
+
+char *header = "[ Mandelbrot by Andrew C. Young ]";
+char *footer = "[ Press Any Key to Exit ]";
+
+WINDOW *win = 0;
+
+void init()
+{
+  initscr();
+  nonl(); 
+  cbreak(); 
+  noecho();
+
+  /* Draw Box */
+  wmove(stdscr,0,0);
+  wclear(stdscr);
+  box(stdscr,'|','-');
+  wmove(stdscr,0,0);
+  waddch(stdscr, '+');
+  wmove(stdscr,0,COLS-1);
+  waddch(stdscr, '+');
+  wmove(stdscr,LINES-1,0);
+  waddch(stdscr, '+');
+  wmove(stdscr,LINES-1,COLS-1);
+  waddch(stdscr, '+');
+  wmove(stdscr,0,( (COLS/2) - (strlen(header)/2) -1 ) );
+  waddstr(stdscr, header);
+  wrefresh(stdscr);
+
+  lines = LINES - 2;
+  cols = COLS - 2;
+  win = newwin(lines,cols,1,1);
+  pixels = (int*)malloc(cols*lines*sizeof(int));
+}
+
+void cleanup()
+{
+  if (pixels != 0)
+  {
+    free(pixels);
+  }
+  endwin();
+}
+
+void calculate()
+{
+  int i, col, row, iteration;
+  double width, height, x0, y0, x, y, xtemp;
+
+  width = (double)cols;
+  height = (double)lines;
+
+  i = 0;
+
+  for (row = 0; row < lines; row++)
+  {
+    y0 = (row * 2.1 / height) - 1;
+    for (col = 0; col < cols; col++)
+    {
+      x0 = (col * 3.5 / width) - 2.5;
+      x = 0.0;
+      y = 0.0;
+      iteration = 0;
+      while ( ((x*x) + (y*y) <= 4) && (iteration < MAX_ITERATIONS))
+      {
+        xtemp = (x*x) - (y*y) + x0;
+        y = (2*x*y) + y0;
+        x = xtemp;
+        iteration++;
+      }
+
+      /* printf("%X",iteration); */
+      pixels[i] = iteration;
+      i++;
+    }
+  }
+}
+
+void display()
+{
+  int i, col, row;
+  int value;
+  char symbol;
+
+  /* Clear the screen */
+  wmove(win,0,0);
+  wclear(win);
+
+  i = 0;
+
+  for (row = 0; row < lines; row++)
+  {
+    wmove(win,row,0);
+    for (col = 0; col < cols; col++)
+    {
+      value = pixels[i];
+      value = value % 16;
+      symbol = symbols[value];
+      waddch(win,symbol);
+      i++;
+    }
+  }
+  wrefresh(win);
+}
+
+void pause()
+{
+  wmove(stdscr,LINES-1,( (COLS/2) - (strlen(footer)/2) -1 ) );
+  waddstr(stdscr, footer);
+  wmove(stdscr,LINES-1,COLS-1);
+  wrefresh(stdscr);
+  getchar();
+}
+
+double time_in_seconds()
+{
+  struct tms buffer;
+  clock_t t = times(&buffer);
+  return t / 60.0;
+}
+
+int main()
+{
+  double start, after_calc, after_display, calc_time, display_time;
+
+  init();
+  start = time_in_seconds();
+  calculate();
+  after_calc = time_in_seconds();
+  display();
+  after_display = time_in_seconds();
+  pause();
+  cleanup();
+
+  calc_time = (after_calc - start); 
+  display_time = (after_display - after_calc); 
+
+  printf("\nCalculation Time: %0.3f secs, Display Time: %0.3f secs, Total Time: %0.3f secs\n", calc_time, display_time, calc_time + display_time);
+
+  return 0;
+}