feat: userspace overhaul, Intel GPU driver, and more

programs/src/fontscale/main.cpp

@@ -0,0 +1,88 @@
+/*
+    * main.cpp
+    * fontscale - Change terminal font scale
+    * Copyright (c) 2025-2026 Daniel Hammer
+*/
+
+#include <zenith/syscall.h>
+#include <zenith/string.h>
+
+static int atoi(const char* s) {
+    int n = 0;
+    while (*s >= '0' && *s <= '9') {
+        n = n * 10 + (*s - '0');
+        s++;
+    }
+    return n;
+}
+
+static void print_int(int n) {
+    char buf[16];
+    int i = 0;
+    if (n == 0) {
+        zenith::putchar('0');
+        return;
+    }
+    while (n > 0 && i < 15) {
+        buf[i++] = '0' + (n % 10);
+        n /= 10;
+    }
+    while (i > 0) zenith::putchar(buf[--i]);
+}
+
+extern "C" void _start() {
+    char args[128];
+    int len = zenith::getargs(args, sizeof(args));
+
+    if (len <= 0 || args[0] == '\0') {
+        // No args: show current scale
+        int sx, sy;
+        zenith::get_termscale(&sx, &sy);
+        int cols, rows;
+        zenith::termsize(&cols, &rows);
+
+        zenith::print("Font scale: ");
+        print_int(sx);
+        zenith::print("x");
+        print_int(sy);
+        zenith::print("  Terminal: ");
+        print_int(cols);
+        zenith::print("x");
+        print_int(rows);
+        zenith::putchar('\n');
+        zenith::exit(0);
+    }
+
+    // Parse arguments
+    const char* p = zenith::skip_spaces(args);
+    int scale_x = atoi(p);
+
+    // Skip past first number to find optional second
+    while (*p >= '0' && *p <= '9') p++;
+    p = zenith::skip_spaces(p);
+    int scale_y = (*p >= '1' && *p <= '8') ? atoi(p) : scale_x;
+
+    if (scale_x < 1 || scale_x > 8 || scale_y < 1 || scale_y > 8) {
+        zenith::print("fontscale: scale must be 1-8\n");
+        zenith::exit(1);
+    }
+
+    zenith::termscale(scale_x, scale_y);
+
+    // Clear and show result
+    zenith::print("\033[2J\033[H");
+
+    int cols, rows;
+    zenith::termsize(&cols, &rows);
+    zenith::print("Font scale set to ");
+    print_int(scale_x);
+    zenith::print("x");
+    print_int(scale_y);
+    zenith::print("  (");
+    print_int(cols);
+    zenith::print("x");
+    print_int(rows);
+    zenith::print(")\n");
+
+    zenith::exit(0);
+}