#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <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;
}