Very epico progaming

Yes
2025-01-15 16:36:48 -07:00 · 2025-01-15 16:36:48 -07:00 · 78df3c131a
commit 78df3c131a
parent 79de3abd33
5 changed files with 857 additions and 1 deletions
--- a/35
+++ b/35
@ -0,0 +1,35 @@
+# cowterm - simple terminal emulator
+include config.mk
+
+SRC = cowterm.c
+OBJ = ${SRC:.c=.o}
+
+all: options cowterm
+
+options:
+	@echo cowterm build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.mk
+
+cowterm: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+	@rm ${OBJ}
+
+clean:
+	rm -f cowterm
+
+install: all
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f cowterm ${DESTDIR}${PREFIX}/bin
+	chmod 755 ${DESTDIR}${PREFIX}/bin/cowterm
+
+uninstall:
+	rm -f ${DESTDIR}${PREFIX}/bin/cowterm
+
+.PHONY: all options clean install uninstall
--- a/README.md
+++ b/README.md
@ -1,3 +1,49 @@
 # cowterm
+What the hell is a cowmonk?

-A simple terminal
+## What is cowterm?
+cowterm is a really simple terminal that is written in pure C, using gtk. I don't recommend anyone seriously using this.
+If you wish to, then good luck I guess? Here are some features that are in cowterm:
+- You can kill processes in it using Ctrl+C
+  - Yes, this had to be manually implemented
+- You can clear it using Ctrl+L
+  - It won't clear if you type in "clear"
+- You can delete everything behind the cursor using Ctrl+U
+  - Essentials amirite?
+- It can be resized
+  - So many Segfaults to get to this revolutionary moment
+- It's hella lightweight
+  - like seriously, it is only like around 600 sloc so like no ram usage at all
+
+Here are some ~~downsides~~ upsides to using cowterm:
+- no scrolling
+  - who needs it amirite? bloat booo
+- boot it up like a chainsaw
+  - Might segfault once or twice before it actually decides to work, I have no idea how to fix this
+- Fonts are hell to configure
+- No wayland
+  - Actually this might be the best "feature" yet
+- ~~ Missing critical features for a terminal~~ Removed lots of bloat
+
+## Building & Installation
+### Dependencies:
+- C compiler (gcc or clang)
+- C libraries
+- Xorg Libs (xfont, xutil, and xlibs)
+- GTK 3.0
+
+### Compilation & Installation
+The steps are very simple, nothing like you've never seen before:
+```bash
+git clone https://git.based.pt/cowmonk/cowterm.git
+cd cowterm
+# Recomended to check config.h and see if it's to your liking
+# vim/nano config.h
+# Also recommended to check config.mk (advanced pro-gamers only!)
+make
+doas/sudo make install
+```
+Enjoy your new ~~awful~~ great terminal
+
+# Credits
+- Me (cowmonk)
--- a/config.h
+++ b/config.h
@ -0,0 +1,35 @@
+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+// Colors are just configured like RBG, if you don't recognize
+// this color format, search it up and find it out yourself
+static const unsigned long int RED = 0xFF0000;
+static const unsigned long int GREEN = 0x00FF00;
+static const unsigned long int YELLOW = 0xFFFF00;
+static const unsigned long int BLUE = 0x0000FF;
+static const unsigned long int MAGENTA = 0xFF00FF;
+static const unsigned long int CYAN = 0x00FFFF;
+static const unsigned long int DARK_GRAY = 0x808080;
+static const unsigned long int LIGHT_RED = 0xFF8080;
+static const unsigned long int LIGHT_GREEN = 0x80FF80;
+static const unsigned long int LIGHT_YELLOW = 0xFFFF80;
+static const unsigned long int LIGHT_BLUE = 0x8080FF;
+static const unsigned long int LIGHT_MAGENTA = 0xFF80FF;
+static const unsigned long int LIGHT_CYAN = 0x80FFFF;
+
+// Configuring Fonts (for dummies)
+// They are formated like this:
+// -foundry-family-weight-slant-width--pixels-points-horz-vert-spacing-width-charset
+// Here are some common examples:
+//   "-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1"
+//   "-adobe-courier-medium-r-normal--14-140-75-75-m-90-iso8859-1"
+//   "-bitstream-terminal-medium-r-normal--18-140-100-100-c-110-iso8859-1"
+// Use 'xlsfonts' command to list available fonts
+static const char REGULAR_FONT[] = "-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1";
+static const char BOLD_FONT[] = "-misc-fixed-bold-r-normal--13-120-75-75-c-70-iso8859-1";
+static const char ITALICS_FONT[] = "-misc-fixed-medium-o-normal--13-120-75-75-c-70-iso8859-1";
+
+// Change the window name to whatever you want lmao
+static const char window_name[] = "CowTerm";
+
+#endif // CONFIG_H_
--- a/config.mk
+++ b/config.mk
@ -0,0 +1,16 @@
+# cowterm - a simple terminal emulator
+
+# paths
+PREFIX = /usr/local/
+
+# includes and libs
+INCS = -I/usr/X11R6/include
+LIBS = -L/usr/X11R6/lib -lX11 -lutil
+
+# flags
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700
+CFLAGS = -std=c99 -pedantic -Wall -Wextra -Os ${INCS} ${CPPFLAGS}
+LDFLAGS = ${LIBS}
+
+# compiler and linker
+CC = cc
--- a/cowterm.c
+++ b/cowterm.c
@ -0,0 +1,724 @@
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/keysym.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pty.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "config.h"
+
+// There isn't a need for MAX_ROWS or MAX_COLS, but ¯\_(ツ)_/¯
+#define MAX_ROWS 1000
+#define MAX_COLS 1000
+#define CHAR_WIDTH 8
+#define CHAR_HEIGHT 16
+#define CURSOR_BLINK_INTERVAL 500000 // 500ms in microseconds
+
+static pid_t child_pid;
+static char **terminal_buffer = NULL;
+static unsigned long **color_buffer = NULL;
+static int **attr_buffer = NULL;
+static int term_rows;
+static int term_cols;
+static int cursor_x = 0;
+static int cursor_y = 0;
+static unsigned long current_color;
+static int current_attr = 0;
+static GC gc = NULL;
+static GC gc_bold = NULL;
+static Display *display = NULL;
+static int cursor_visible = 1;
+static struct timeval last_blink;
+static Pixmap buffer_pixmap = None;
+static int master_fd = -1;
+static XFontStruct *regular_font = NULL;
+static XFontStruct *bold_font = NULL;
+static XFontStruct *italic_font = NULL;
+
+#define ATTR_BOLD 1
+#define ATTR_ITALIC 2
+
+// Pesky static smth smth error, so we "declare" it early
+static void draw_terminal(Display *display, Window window);
+static void draw_char(Display *display, Drawable d, int x, int y);
+
+// Cursor gameplay <== ==>
+static void draw_cursor(Display *display, Window window) {
+  if (!gc || !terminal_buffer || !color_buffer || cursor_y >= term_rows ||
+      cursor_x >= term_cols)
+    return;
+
+  // First restore the character that was under the cursor
+  if (cursor_x < term_cols && cursor_y < term_rows) {
+    draw_char(display, buffer_pixmap, cursor_x, cursor_y);
+  }
+
+  if (cursor_visible) {
+    // Save original color
+    unsigned long original_color = color_buffer[cursor_y][cursor_x];
+
+    // Draw inverted cursor background
+    XSetForeground(display, gc, original_color);
+    XFillRectangle(display, buffer_pixmap, gc, cursor_x * CHAR_WIDTH,
+                   cursor_y * CHAR_HEIGHT, CHAR_WIDTH, CHAR_HEIGHT);
+
+    // Draw the character in inverted color
+    if (cursor_x < term_cols && cursor_y < term_rows) {
+      char str[2] = {terminal_buffer[cursor_y][cursor_x], '\0'};
+      XSetForeground(display, gc, XBlackPixel(display, DefaultScreen(display)));
+
+      XFontStruct *font = regular_font;
+      if (attr_buffer[cursor_y][cursor_x] & ATTR_BOLD) {
+        font = bold_font;
+      } else if (attr_buffer[cursor_y][cursor_x] & ATTR_ITALIC) {
+        font = italic_font;
+      }
+      XSetFont(display, gc, font->fid);
+
+      XDrawString(display, buffer_pixmap, gc, cursor_x * CHAR_WIDTH,
+                  (cursor_y + 1) * CHAR_HEIGHT - 2, str, 1);
+    }
+  }
+
+  // Copy the relevant area to the window
+  XCopyArea(display, buffer_pixmap, window, gc, cursor_x * CHAR_WIDTH,
+            cursor_y * CHAR_HEIGHT, CHAR_WIDTH, CHAR_HEIGHT,
+            cursor_x * CHAR_WIDTH, cursor_y * CHAR_HEIGHT);
+}
+
+static void update_cursor_blink(Display *display, Window window) {
+  struct timeval now;
+  gettimeofday(&now, NULL);
+
+  long elapsed = (now.tv_sec - last_blink.tv_sec) * 1000000 +
+                 (now.tv_usec - last_blink.tv_usec);
+
+  if (elapsed >= CURSOR_BLINK_INTERVAL) {
+    cursor_visible = !cursor_visible;
+    last_blink = now;
+    draw_cursor(display, window);
+    XFlush(display);
+  }
+}
+
+// resize_buffers visual:
+//
+// Old buffer (3x3):     New buffer (4x4):
+// [a][b][c]            [a][b][c][ ]
+// [d][e][f]     ->     [d][e][f][ ]
+// [g][h][i]            [g][h][i][ ]
+//                      [ ][ ][ ][ ]
+//
+// 1. Allocates new larger buffer
+// 2. Copies existing content
+// 3. Fills new space with blanks
+// 4. Updates cursor position
+// 5. Frees old buffer
+static void resize_buffers(int new_rows, int new_cols) {
+  if (new_rows > MAX_ROWS)
+    new_rows = MAX_ROWS;
+  if (new_cols > MAX_COLS)
+    new_cols = MAX_COLS;
+  if (new_rows < 1)
+    new_rows = 1;
+  if (new_cols < 1)
+    new_cols = 1;
+
+  size_t row_size = ((new_cols * sizeof(char) + 15) & ~15);
+  size_t color_row_size = ((new_cols * sizeof(unsigned long) + 15) & ~15);
+  size_t attr_row_size = ((new_cols * sizeof(int) + 15) & ~15);
+
+  char **new_term_buffer = malloc(new_rows * sizeof(char *));
+  unsigned long **new_color_buffer = malloc(new_rows * sizeof(unsigned long *));
+  int **new_attr_buffer = malloc(new_rows * sizeof(int *));
+
+  if (!new_term_buffer || !new_color_buffer || !new_attr_buffer) {
+    fprintf(stderr, "Failed to allocate memory for buffers\n");
+    return;
+  }
+
+  for (int i = 0; i < new_rows; i++) {
+    new_term_buffer[i] = malloc(row_size);
+    new_color_buffer[i] = malloc(color_row_size);
+    new_attr_buffer[i] = malloc(attr_row_size);
+
+    if (!new_term_buffer[i] || !new_color_buffer[i] || !new_attr_buffer[i]) {
+      fprintf(stderr, "Failed to allocate memory for buffer row\n");
+      // Clean up allocated memory
+      for (int j = 0; j < i; j++) {
+        free(new_term_buffer[j]);
+        free(new_color_buffer[j]);
+        free(new_attr_buffer[j]);
+      }
+      free(new_term_buffer);
+      free(new_color_buffer);
+      free(new_attr_buffer);
+      return;
+    }
+
+    if (i < term_rows && i < new_rows && terminal_buffer && color_buffer &&
+        attr_buffer) {
+      int copy_cols = (new_cols < term_cols) ? new_cols : term_cols;
+      memcpy(new_term_buffer[i], terminal_buffer[i], copy_cols * sizeof(char));
+      memcpy(new_color_buffer[i], color_buffer[i],
+             copy_cols * sizeof(unsigned long));
+      memcpy(new_attr_buffer[i], attr_buffer[i], copy_cols * sizeof(int));
+      if (new_cols > term_cols) {
+        memset(new_term_buffer[i] + term_cols, ' ', new_cols - term_cols);
+        for (int x = term_cols; x < new_cols; x++) {
+          new_color_buffer[i][x] = current_color;
+          new_attr_buffer[i][x] = current_attr;
+        }
+      }
+    } else {
+      memset(new_term_buffer[i], ' ', new_cols);
+      for (int x = 0; x < new_cols; x++) {
+        new_color_buffer[i][x] = current_color;
+        new_attr_buffer[i][x] = current_attr;
+      }
+    }
+  }
+
+  // Free old buffers after successful allocation
+  if (terminal_buffer && color_buffer && attr_buffer) {
+    for (int i = 0; i < term_rows; i++) {
+      free(terminal_buffer[i]);
+      free(color_buffer[i]);
+      free(attr_buffer[i]);
+    }
+    free(terminal_buffer);
+    free(color_buffer);
+    free(attr_buffer);
+  }
+
+  terminal_buffer = new_term_buffer;
+  color_buffer = new_color_buffer;
+  attr_buffer = new_attr_buffer;
+  term_rows = new_rows;
+  term_cols = new_cols;
+
+  cursor_x = (cursor_x >= term_cols) ? term_cols - 1 : cursor_x;
+  cursor_y = (cursor_y >= term_rows) ? term_rows - 1 : cursor_y;
+
+  // Resize buffer pixmap
+  if (buffer_pixmap != None) {
+    XFreePixmap(display, buffer_pixmap);
+  }
+  buffer_pixmap = XCreatePixmap(display, DefaultRootWindow(display),
+                                term_cols * CHAR_WIDTH, term_rows * CHAR_HEIGHT,
+                                DefaultDepth(display, DefaultScreen(display)));
+}
+
+static void destroy_cb(Display *display, Window window) {
+  if (child_pid > 0) {
+    kill(child_pid, SIGTERM);
+    waitpid(child_pid, NULL, 0);
+  }
+  if (gc)
+    XFreeGC(display, gc);
+  if (gc_bold)
+    XFreeGC(display, gc_bold);
+  if (buffer_pixmap != None)
+    XFreePixmap(display, buffer_pixmap);
+  if (display)
+    XCloseDisplay(display);
+  if (terminal_buffer) {
+    for (int i = 0; i < term_rows; i++) {
+      free(terminal_buffer[i]);
+    }
+    free(terminal_buffer);
+  }
+  if (color_buffer) {
+    for (int i = 0; i < term_rows; i++) {
+      free(color_buffer[i]);
+    }
+    free(color_buffer);
+  }
+  if (attr_buffer) {
+    for (int i = 0; i < term_rows; i++) {
+      free(attr_buffer[i]);
+    }
+    free(attr_buffer);
+  }
+  if (master_fd >= 0)
+    close(master_fd);
+  exit(0);
+}
+
+static void draw_char(Display *display, Drawable d, int x, int y) {
+  if (!gc || !terminal_buffer || !color_buffer || !attr_buffer)
+    return;
+  if (x < 0 || x >= term_cols || y < 0 || y >= term_rows)
+    return;
+
+  // Clear the character position first
+  XSetForeground(display, gc, XBlackPixel(display, DefaultScreen(display)));
+  XFillRectangle(display, d, gc, x * CHAR_WIDTH, y * CHAR_HEIGHT, CHAR_WIDTH,
+                 CHAR_HEIGHT);
+
+  char str[2] = {terminal_buffer[y][x], '\0'};
+  XSetForeground(display, gc, color_buffer[y][x]);
+
+  // Select appropriate font based on attributes
+  XFontStruct *font = regular_font;
+  if (attr_buffer[y][x] & ATTR_BOLD) {
+    font = bold_font;
+  } else if (attr_buffer[y][x] & ATTR_ITALIC) {
+    font = italic_font;
+  }
+  XSetFont(display, gc, font->fid);
+
+  XDrawString(display, d, gc, x * CHAR_WIDTH, (y + 1) * CHAR_HEIGHT - 2, str,
+              1);
+}
+
+static void draw_terminal(Display *display, Window window) {
+  if (!gc) {
+    gc = XCreateGC(display, window, 0, NULL);
+
+    regular_font = XLoadQueryFont(
+        display, REGULAR_FONT);
+    bold_font = XLoadQueryFont(
+        display, BOLD_FONT);
+    italic_font = XLoadQueryFont(
+        display, ITALICS_FONT);
+
+    if (!regular_font)
+      regular_font = XLoadQueryFont(display, "fixed");
+    if (!bold_font)
+      bold_font = regular_font;
+    if (!italic_font)
+      italic_font = regular_font;
+
+    XSetFont(display, gc, regular_font->fid);
+  }
+
+  if (!terminal_buffer || !color_buffer || !attr_buffer)
+    return;
+
+  if (buffer_pixmap == None) {
+    buffer_pixmap = XCreatePixmap(
+        display, DefaultRootWindow(display), term_cols * CHAR_WIDTH,
+        term_rows * CHAR_HEIGHT, DefaultDepth(display, DefaultScreen(display)));
+  }
+
+  // Draw to buffer first
+  for (int y = 0; y < term_rows; y++) {
+    for (int x = 0; x < term_cols; x++) {
+      draw_char(display, buffer_pixmap, x, y);
+    }
+  }
+
+  // Copy buffer to window
+  XCopyArea(display, buffer_pixmap, window, gc, 0, 0, term_cols * CHAR_WIDTH,
+            term_rows * CHAR_HEIGHT, 0, 0);
+
+  draw_cursor(display, window);
+  XFlush(display);
+}
+
+static void clear_terminal(Display *display, Window window) {
+  if (!terminal_buffer || !color_buffer || !attr_buffer)
+    return;
+  for (int y = 0; y < term_rows; y++) {
+    memset(terminal_buffer[y], ' ', term_cols);
+    for (int x = 0; x < term_cols; x++) {
+      color_buffer[y][x] = current_color;
+      attr_buffer[y][x] = current_attr;
+    }
+  }
+  cursor_x = 0;
+  cursor_y = 0;
+  draw_terminal(display, window);
+}
+
+// Scroll the terminal up one line
+static void scroll_up(void) {
+  // Move all lines up one position
+  for (int y = 0; y < term_rows - 1; y++) {
+    memcpy(terminal_buffer[y], terminal_buffer[y + 1], term_cols);
+    memcpy(color_buffer[y], color_buffer[y + 1],
+           term_cols * sizeof(unsigned long));
+    memcpy(attr_buffer[y], attr_buffer[y + 1], term_cols * sizeof(int));
+  }
+
+  // Clear the bottom line
+  memset(terminal_buffer[term_rows - 1], ' ', term_cols);
+  for (int x = 0; x < term_cols; x++) {
+    color_buffer[term_rows - 1][x] = current_color;
+    attr_buffer[term_rows - 1][x] = current_attr;
+  }
+}
+
+// Handles those pesky ANSI color escape codes that terminals use.
+// When \033[<number>m is sent to the terminal, it changes text color:
+//   30 = Black    31 = Red      32 = Green   33 = Yellow
+//   34 = Blue     35 = Magenta  36 = Cyan    37 = White
+// 0 sets everything back to plain white
+// P.S. yes I had to google this up
+static void parse_ansi_code(const char *buf, int *idx, int max_len) {
+  char num_buf[16] = {0};
+  int num_idx = 0;
+  (*idx)++; // Skip [
+
+  while (*idx < max_len && buf[*idx] != 'm') {
+    if (buf[*idx] >= '0' && buf[*idx] <= '9') {
+      num_buf[num_idx++] = buf[*idx];
+    }
+    (*idx)++;
+  }
+
+  if (num_buf[0] != '\0') {
+    int code = atoi(num_buf);
+    switch (code) {
+    case 0:
+      current_color = XWhitePixel(display, DefaultScreen(display));
+      current_attr = 0;
+      break;
+    case 1:
+      current_attr |= ATTR_BOLD;
+      break;
+    case 3:
+      current_attr |= ATTR_ITALIC;
+      break;
+    case 22:
+      current_attr &= ~ATTR_BOLD;
+      break;
+    case 23:
+      current_attr &= ~ATTR_ITALIC;
+      break;
+    case 30:
+      current_color = XBlackPixel(display, DefaultScreen(display));
+      break;
+    case 31:
+      current_color = RED; // Red
+      break;
+    case 32:
+      current_color = GREEN; // Green
+      break;
+    case 33:
+      current_color = YELLOW; // Yellow
+      break;
+    case 34:
+      current_color = BLUE; // Blue
+      break;
+    case 35:
+      current_color = MAGENTA; // Magenta
+      break;
+    case 36:
+      current_color = CYAN; // Cyan
+      break;
+    case 37:
+      current_color = XWhitePixel(display, DefaultScreen(display));
+      break;
+    case 90:
+      current_color = DARK_GRAY; // Dark gray
+      break;
+    case 91:
+      current_color = LIGHT_RED; // Light red
+      break;
+    case 92:
+      current_color = LIGHT_GREEN; // Light green
+      break;
+    case 93:
+      current_color = LIGHT_YELLOW; // Light yellow
+      break;
+    case 94:
+      current_color = LIGHT_BLUE; // Light blue
+      break;
+    case 95:
+      current_color = LIGHT_MAGENTA; // Light magenta
+      break;
+    case 96:
+      current_color = LIGHT_CYAN; // Light cyan
+      break;
+    case 97:
+      current_color = 0xFFFFFF; // Bright white teehee
+      break;
+    }
+  }
+}
+
+static int master_cb(int fd, void *data) {
+  if (!terminal_buffer || !color_buffer || !attr_buffer)
+    return 0;
+  char buf[4096];
+  ssize_t bytes_read;
+  struct {
+    Display *display;
+    Window window;
+  } *ctx = data;
+
+  bytes_read = read(fd, buf, sizeof(buf));
+  if (bytes_read <= 0 && errno != EAGAIN && errno != EINTR) {
+    destroy_cb(ctx->display, ctx->window);
+    return 0;
+  }
+  if (bytes_read > 0) {
+    for (int i = 0; i < bytes_read; i++) {
+      if (buf[i] == '\033' && i + 1 < bytes_read && buf[i + 1] == '[') {
+        parse_ansi_code(buf, &i, bytes_read);
+        continue;
+      }
+      if (buf[i] == '\n') {
+        cursor_x = 0;
+        cursor_y++;
+        if (cursor_y >= term_rows) {
+          scroll_up();
+          cursor_y = term_rows - 1;
+          draw_terminal(ctx->display, ctx->window);
+        }
+      } else if (buf[i] == '\r') {
+        cursor_x = 0;
+      } else if (buf[i] == '\b') {
+        if (cursor_x > 0) {
+          cursor_x--;
+          terminal_buffer[cursor_y][cursor_x] = ' ';
+          draw_char(ctx->display, buffer_pixmap, cursor_x, cursor_y);
+          XCopyArea(ctx->display, buffer_pixmap, ctx->window, gc,
+                    cursor_x * CHAR_WIDTH, cursor_y * CHAR_HEIGHT, CHAR_WIDTH,
+                    CHAR_HEIGHT, cursor_x * CHAR_WIDTH, cursor_y * CHAR_HEIGHT);
+        }
+      } else {
+        if (cursor_y < term_rows && cursor_x < term_cols) {
+          terminal_buffer[cursor_y][cursor_x] = buf[i];
+          color_buffer[cursor_y][cursor_x] = current_color;
+          attr_buffer[cursor_y][cursor_x] = current_attr;
+          draw_char(ctx->display, buffer_pixmap, cursor_x, cursor_y);
+          XCopyArea(ctx->display, buffer_pixmap, ctx->window, gc,
+                    cursor_x * CHAR_WIDTH, cursor_y * CHAR_HEIGHT, CHAR_WIDTH,
+                    CHAR_HEIGHT, cursor_x * CHAR_WIDTH, cursor_y * CHAR_HEIGHT);
+          cursor_x++;
+          if (cursor_x >= term_cols) {
+            cursor_x = 0;
+            cursor_y++;
+            if (cursor_y >= term_rows) {
+              scroll_up();
+              cursor_y = term_rows - 1;
+              draw_terminal(ctx->display, ctx->window);
+            }
+          }
+        }
+      }
+    }
+    cursor_visible = 1;
+    draw_cursor(ctx->display, ctx->window);
+    XFlush(ctx->display);
+  }
+  return 1;
+}
+
+static void key_press_cb(XKeyEvent *event, void *data) {
+  int *master = (int *)data;
+  char buf[32];
+  KeySym keysym;
+  int len;
+
+  len = XLookupString(event, buf, sizeof(buf), &keysym, NULL);
+
+  if (event->state & ControlMask) {
+    if ((keysym & 0x1f) == ('L' & 0x1f)) {
+      write(*master, "\f", 1);
+      clear_terminal(event->display, event->window);
+      return;
+    }
+    if ((keysym & 0x1f) == ('C' & 0x1f)) {
+      kill(child_pid, SIGINT);
+      return;
+    }
+    if ((keysym & 0x1f) == ('U' & 0x1f)) {
+      write(*master, "\025", 1);
+      return;
+    }
+    char ctrl_char = '@' + (keysym & 0x1f);
+    write(*master, &ctrl_char, 1);
+    return;
+  }
+
+  if (keysym == XK_Return || keysym == XK_KP_Enter) {
+    write(*master, "\r", 1);
+  } else if (keysym == XK_BackSpace) {
+    write(*master, "\b", 1);
+  } else if (len > 0) {
+    write(*master, buf, len);
+  }
+}
+
+int main(void) {
+  int master, slave;
+  pid_t pid;
+
+  term_rows = 24;
+  term_cols = 80;
+
+  gettimeofday(&last_blink, NULL);
+
+  struct winsize ws = {.ws_row = term_rows,
+                       .ws_col = term_cols,
+                       .ws_xpixel = term_cols * CHAR_WIDTH,
+                       .ws_ypixel = term_rows * CHAR_HEIGHT};
+
+  terminal_buffer = malloc(term_rows * sizeof(char *));
+  color_buffer = malloc(term_rows * sizeof(unsigned long *));
+  attr_buffer = malloc(term_rows * sizeof(int *));
+
+  if (!terminal_buffer || !color_buffer || !attr_buffer) {
+    fprintf(stderr, "Failed to allocate memory for buffers\n");
+    return 1;
+  }
+
+  for (int i = 0; i < term_rows; i++) {
+    terminal_buffer[i] = malloc(term_cols * sizeof(char));
+    color_buffer[i] = malloc(term_cols * sizeof(unsigned long));
+    attr_buffer[i] = malloc(term_cols * sizeof(int));
+
+    if (!terminal_buffer[i] || !color_buffer[i] || !attr_buffer[i]) {
+      fprintf(stderr, "Failed to allocate memory for buffer row\n");
+      return 1;
+    }
+    memset(terminal_buffer[i], ' ', term_cols);
+    memset(attr_buffer[i], 0, term_cols * sizeof(int));
+  }
+
+  display = XOpenDisplay(NULL);
+  if (!display) {
+    fprintf(stderr, "Cannot open display\n");
+    return 1;
+  }
+  XInitThreads();
+
+  current_color = XWhitePixel(display, DefaultScreen(display));
+  current_attr = 0;
+
+  for (int y = 0; y < term_rows; y++) {
+    for (int x = 0; x < term_cols; x++) {
+      color_buffer[y][x] = current_color;
+      attr_buffer[y][x] = current_attr;
+    }
+  }
+
+  XSizeHints hints;
+  hints.flags = PResizeInc | PMinSize;
+  hints.width_inc = CHAR_WIDTH;
+  hints.height_inc = CHAR_HEIGHT;
+  hints.min_width = CHAR_WIDTH * 4;
+  hints.min_height = CHAR_HEIGHT * 1;
+
+  Window window = XCreateSimpleWindow(
+      display, DefaultRootWindow(display), 0, 0, term_cols * CHAR_WIDTH,
+      term_rows * CHAR_HEIGHT, 0, XBlackPixel(display, DefaultScreen(display)),
+      XBlackPixel(display, DefaultScreen(display)));
+
+  buffer_pixmap = XCreatePixmap(display, DefaultRootWindow(display),
+                                term_cols * CHAR_WIDTH, term_rows * CHAR_HEIGHT,
+                                DefaultDepth(display, DefaultScreen(display)));
+
+  XSetWMNormalHints(display, window, &hints);
+  XStoreName(display, window, window_name);
+  XSelectInput(display, window,
+               KeyPressMask | ExposureMask | StructureNotifyMask);
+  XMapWindow(display, window);
+
+  if (openpty(&master, &slave, NULL, NULL, &ws) == -1) {
+    perror("openpty");
+    return 1;
+  }
+
+  master_fd = master;
+
+  pid = fork();
+  if (pid < 0) {
+    perror("fork");
+    return 1;
+  }
+
+  if (pid == 0) {
+    close(master);
+    close(STDIN_FILENO);
+    close(STDOUT_FILENO);
+    close(STDERR_FILENO);
+
+    setsid();
+    dup2(slave, 0);
+    dup2(slave, 1);
+    dup2(slave, 2);
+
+    if (slave > 2)
+      close(slave);
+
+    char *shell = getenv("SHELL");
+    if (!shell)
+      shell = "/bin/sh";
+
+    setenv("TERM", "xterm-256color", 1);
+    execlp(shell, shell, NULL);
+    perror("execlp");
+    exit(1);
+  }
+
+  child_pid = pid;
+  close(slave);
+
+  struct {
+    Display *display;
+    Window window;
+  } ctx = {display, window};
+
+  XEvent event;
+  while (1) {
+    int status;
+    pid_t wpid = waitpid(child_pid, &status, WNOHANG);
+    if (wpid == child_pid) {
+      destroy_cb(display, window);
+      return 0;
+    }
+
+    while (XPending(display)) {
+      XNextEvent(display, &event);
+      switch (event.type) {
+      case ConfigureNotify: {
+        XConfigureEvent *ce = (XConfigureEvent *)&event;
+        int new_rows = ce->height / CHAR_HEIGHT;
+        int new_cols = ce->width / CHAR_WIDTH;
+        if (new_rows != term_rows || new_cols != term_cols) {
+          resize_buffers(new_rows, new_cols);
+          ws.ws_row = term_rows;
+          ws.ws_col = term_cols;
+          ws.ws_xpixel = term_cols * CHAR_WIDTH;
+          ws.ws_ypixel = term_rows * CHAR_HEIGHT;
+          ioctl(master, TIOCSWINSZ, &ws);
+        }
+        break;
+      }
+      case KeyPress:
+        key_press_cb((XKeyEvent *)&event, &master);
+        break;
+      case Expose:
+        draw_terminal(display, window);
+        break;
+      }
+    }
+
+    fd_set fds;
+    struct timeval tv = {0, 100000}; // 100ms timeout for cursor blink
+    FD_ZERO(&fds);
+    FD_SET(master, &fds);
+    if (select(master + 1, &fds, NULL, NULL, &tv) > 0) {
+      master_cb(master, &ctx);
+    }
+
+    update_cursor_blink(display, window);
+  }
+
+  return 0;
+}