major restructuring, prepare for smp

code/user/apps/resolve/resolve.c

@@ -0,0 +1,81 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <ntlite/syscall.h>
+
+static void print(const char* s) {
+    if (s) { SYS_WRITE_CONSOLE_REQUEST req = { SysSvFromCstr(s) }; SysWriteConsole(&req); }
+}
+
+static void print_char(char c) {
+    SYS_WRITE_CONSOLE_REQUEST req = { SysSvFromParts(&c, 1) };
+    SysWriteConsole(&req);
+}
+
+static void print_u64(uint64_t v) {
+    char buf[32];
+    int n = 0;
+    if (v == 0) { print("0"); return; }
+    while (v && n < (int)sizeof(buf)) {
+        buf[n++] = (char)('0' + (v % 10));
+        v /= 10;
+    }
+    while (n > 0) print_char(buf[--n]);
+}
+
+static const char* next_token(const char* s, char* out, size_t outSize) {
+    if (!s || !out || outSize == 0) return NULL;
+    while (*s == ' ' || *s == '\t') s++;
+    if (*s == 0) { out[0] = 0; return NULL; }
+
+    size_t n = 0;
+    while (*s && *s != ' ' && *s != '\t') {
+        if (n + 1 < outSize) out[n++] = *s;
+        s++;
+    }
+    out[n] = 0;
+    return s;
+}
+
+static void print_ipv4(const uint8_t ip[4]) {
+    print_u64(ip[0]); print("."); print_u64(ip[1]); print(".");
+    print_u64(ip[2]); print("."); print_u64(ip[3]);
+}
+
+int main(void) {
+    char name[256];
+    const char* cmd = SysGetPeb()->CommandLine.Data;
+    cmd = next_token(cmd, name, sizeof(name)); // program path
+    (void)cmd;
+
+    name[0] = 0;
+    if (cmd)
+        (void)next_token(cmd, name, sizeof(name));
+    if (!name[0]) {
+        print("usage: resolve.exe hostname\n");
+        SysExitProcess(1);
+    }
+
+    SYS_SOCKET_ADDRESS_IPV4 addr;
+    size_t addrSize = sizeof(addr);
+    SYS_RESOLVE_HOST_REQUEST req;
+    memset(&addr, 0, sizeof(addr));
+    memset(&req, 0, sizeof(req));
+    req.Name = SysSvFromCstr(name);
+    req.Family = SYS_AF_INET;
+    req.AddressOut = &addr;
+    req.AddressSizeInOut = &addrSize;
+
+    uint32_t st = SysResolveHost(&req);
+    if (st != SYS_STATUS_SUCCESS) {
+        print("resolve: SysResolveHost failed "); print_u64(st); print("\n");
+        SysExitProcess(1);
+    }
+
+    print(name);
+    print(" -> ");
+    print_ipv4(addr.Address);
+    print("\n");
+    SysExitProcess(0);
+    return 0;
+}