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

programs/src/ping/main.cpp

@@ -0,0 +1,101 @@
+/*
+    * main.cpp
+    * ping - Send ICMP echo requests
+    * Copyright (c) 2025-2026 Daniel Hammer
+*/
+
+#include <zenith/syscall.h>
+
+static void print_int(uint64_t n) {
+    if (n == 0) {
+        zenith::putchar('0');
+        return;
+    }
+    char buf[20];
+    int i = 0;
+    while (n > 0) {
+        buf[i++] = '0' + (n % 10);
+        n /= 10;
+    }
+    for (int j = i - 1; j >= 0; j--) {
+        zenith::putchar(buf[j]);
+    }
+}
+
+static bool parse_ip(const char* s, uint32_t* out) {
+    uint32_t octets[4];
+    int idx = 0;
+    uint32_t val = 0;
+    bool hasDigit = false;
+
+    for (int i = 0; ; i++) {
+        char c = s[i];
+        if (c >= '0' && c <= '9') {
+            val = val * 10 + (c - '0');
+            if (val > 255) return false;
+            hasDigit = true;
+        } else if (c == '.' || c == '\0') {
+            if (!hasDigit || idx >= 4) return false;
+            octets[idx++] = val;
+            val = 0;
+            hasDigit = false;
+            if (c == '\0') break;
+        } else {
+            return false;
+        }
+    }
+
+    if (idx != 4) return false;
+    *out = octets[0] | (octets[1] << 8) | (octets[2] << 16) | (octets[3] << 24);
+    return true;
+}
+
+static void print_ip(uint32_t ip) {
+    print_int(ip & 0xFF);
+    zenith::putchar('.');
+    print_int((ip >> 8) & 0xFF);
+    zenith::putchar('.');
+    print_int((ip >> 16) & 0xFF);
+    zenith::putchar('.');
+    print_int((ip >> 24) & 0xFF);
+}
+
+extern "C" void _start() {
+    char args[256];
+    int len = zenith::getargs(args, sizeof(args));
+
+    if (len <= 0 || args[0] == '\0') {
+        zenith::print("Usage: ping <ip address>\n");
+        zenith::exit(1);
+    }
+
+    uint32_t ip;
+    if (!parse_ip(args, &ip)) {
+        zenith::print("Invalid IP address: ");
+        zenith::print(args);
+        zenith::putchar('\n');
+        zenith::exit(1);
+    }
+
+    zenith::print("PING ");
+    print_ip(ip);
+    zenith::putchar('\n');
+
+    for (int i = 0; i < 4; i++) {
+        int32_t rtt = zenith::ping(ip, 3000);
+        if (rtt < 0) {
+            zenith::print("  Request timed out\n");
+        } else {
+            zenith::print("  Reply from ");
+            print_ip(ip);
+            zenith::print(": time=");
+            print_int((uint64_t)rtt);
+            zenith::print("ms\n");
+        }
+        if (i < 3) {
+            zenith::sleep_ms(1000);
+        }
+    }
+
+    zenith::exit(0);
+}