feat: e100e Ethernet driver, ramdisk reorganization, shell rewrite, web server/client, and more

programs/src/cat/main.cpp

@@ -0,0 +1,66 @@
+/*
+    * main.cpp
+    * cat - Display file contents
+    * Copyright (c) 2025-2026 Daniel Hammer
+*/
+
+#include <zenith/syscall.h>
+
+extern "C" void _start() {
+    char args[256];
+    int len = zenith::getargs(args, sizeof(args));
+
+    if (len <= 0 || args[0] == '\0') {
+        zenith::print("Usage: cat <filename>\n");
+        zenith::exit(1);
+    }
+
+    // Build VFS path. If the path already starts with "<digit>:", use as-is.
+    // Otherwise, prefix "0:/" to it.
+    char path[256];
+    bool hasPrefix = false;
+    if (args[0] >= '0' && args[0] <= '9' && args[1] == ':') {
+        hasPrefix = true;
+    }
+
+    int i = 0;
+    if (!hasPrefix) {
+        path[0] = '0'; path[1] = ':'; path[2] = '/';
+        i = 3;
+    }
+    int j = 0;
+    while (args[j] && i < 255) {
+        path[i++] = args[j++];
+    }
+    path[i] = '\0';
+
+    int handle = zenith::open(path);
+    if (handle < 0) {
+        zenith::print("cat: cannot open '");
+        zenith::print(args);
+        zenith::print("'\n");
+        zenith::exit(1);
+    }
+
+    uint64_t size = zenith::getsize(handle);
+    if (size == 0) {
+        zenith::close(handle);
+        zenith::exit(0);
+    }
+
+    uint8_t buf[512];
+    uint64_t offset = 0;
+    while (offset < size) {
+        uint64_t chunk = size - offset;
+        if (chunk > sizeof(buf) - 1) chunk = sizeof(buf) - 1;
+        int bytesRead = zenith::read(handle, buf, offset, chunk);
+        if (bytesRead <= 0) break;
+        buf[bytesRead] = '\0';
+        zenith::print((const char*)buf);
+        offset += bytesRead;
+    }
+
+    zenith::close(handle);
+    zenith::putchar('\n');
+    zenith::exit(0);
+}