[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
)len + 1);
    if (!buf) {
        fprintf(stderr, "ds4: out of memory reading prompt file: %s\n", path);
        fclose(fp);
        if (fatal) exit(2);
        return NULL;
    }
    size_t nread = fread(buf, 1, (size_t)len, fp);
    if (nread != (size_t)len) {
        fprintf(stderr, "ds4: failed to read prompt file: %s\n", path);
        free(buf);
        fclose(fp);
        if (fatal) exit(2);
        return NULL;
    }
    if (fclose(fp) != 0) {
        fprintf(stderr, "ds4: failed to close prompt file: %s\n", path);
        free(buf);
        if (fatal) exit(2);
        return NULL;
    }
    buf[len] = '\0';
    return buf;
}

static cli_config parse_options(int argc, char **argv) {
    cli_config c = {
        .engine = {
            .model_path = "ds4flash.gguf",
            .backend = default_backend(),
            .mtp_draft_tokens = 1,
            .mtp_margin = 3.0f,
        },
        .gen = {
            .prompt = NULL,
            .system = "You are a helpful assistant",
            .n_predict = 50000,
            .ctx_size = 32768,
            .temperature = 1.0f,
            .top_p = 1.0f,
            .dump_logprobs_top_k = 20,
            .think_mode = DS4_THINK_HIGH,
        },
    };

    bool directional_steering_scale_set = false;
    for (int i = 1; i < argc; i++) {
        const char *arg = argv[i];
        if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) {
            usage(stdout);
            exit(0);
        } else if (!strcmp(arg, "-p") || !strcmp(arg, "--prompt")) {
            if (c.gen.prompt) {
                fprintf(stderr, "ds4: specify only one prompt source\n");
                exit(2);
            }
            c.gen.prompt = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--prompt-file")) {
            if (c.gen.prompt) {
                fprintf(stderr, "ds4: specify only one prompt source\n");
                exit(2);
            }
            c.prompt_owned = read_prompt_file(need_arg(&i, argc, argv, arg), true);
            c.gen.prompt = c.prompt_owned;
        } else if (!strcmp(arg, "-sys") || !strcmp(arg, "--system")) {
            c.gen.system = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "-m") || !strcmp(arg, "--model")) {
            c.engine.model_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp")) {
            c.engine.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
)len + 1);
    if (!buf) {
        fprintf(stderr, "ds4: out of memory reading prompt file: %s\n", path);
        fclose(fp);
        if (fatal) exit(2);
        return NULL;
    }
    size_t nread = fread(buf, 1, (size_t)len, fp);
    if (nread != (size_t)len) {
        fprintf(stderr, "ds4: failed to read prompt file: %s\n", path);
        free(buf);
        fclose(fp);
        if (fatal) exit(2);
        return NULL;
    }
    if (fclose(fp) != 0) {
        fprintf(stderr, "ds4: failed to close prompt file: %s\n", path);
        free(buf);
        if (fatal) exit(2);
        return NULL;
    }
    buf[len] = '\0';
    return buf;
}

static cli_config parse_options(int argc, char **argv) {
    cli_config c = {
        .engine = {
            .model_path = "ds4flash.gguf",
            .backend = default_backend(),
            .mtp_draft_tokens = 1,
            .mtp_margin = 3.0f,
        },
        .gen = {
            .prompt = NULL,
            .system = "You are a helpful assistant",
            .n_predict = 50000,
            .ctx_size = 32768,
            .temperature = 1.0f,
            .top_p = 1.0f,
            .dump_logprobs_top_k = 20,
            .think_mode = DS4_THINK_HIGH,
        },
    };

    bool directional_steering_scale_set = false;
    for (int i = 1; i < argc; i++) {
        const char *arg = argv[i];
        if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) {
            usage(stdout);
            exit(0);
        } else if (!strcmp(arg, "-p") || !strcmp(arg, "--prompt")) {
            if (c.gen.prompt) {
                fprintf(stderr, "ds4: specify only one prompt source\n");
                exit(2);
            }
            c.gen.prompt = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--prompt-file")) {
            if (c.gen.prompt) {
                fprintf(stderr, "ds4: specify only one prompt source\n");
                exit(2);
            }
            c.prompt_owned = read_prompt_file(need_arg(&i, argc, argv, arg), true);
            c.gen.prompt = c.prompt_owned;
        } else if (!strcmp(arg, "-sys") || !strcmp(arg, "--system")) {
            c.gen.system = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "-m") || !strcmp(arg, "--model")) {
            c.engine.model_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp")) {
            c.engine.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
e.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--mtp-margin")) {
            c.engine.mtp_margin = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1000.0f);
        } else if (!strcmp(arg, "-n") || !strcmp(arg, "--tokens")) {
            c.gen.n_predict = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "-c") || !strcmp(arg, "--ctx")) {
            c.gen.ctx_size = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--temp")) {
            c.gen.temperature = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 100.0f);
        } else if (!strcmp(arg, "--top-p")) {
            c.gen.top_p = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1.0f);
        } else if (!strcmp(arg, "--seed")) {
            c.gen.seed = parse_u64(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--quality")) {
            c.engine.quality = true;
        } else if (!strcmp(arg, "--dir-steering-file")) {
            c.engine.directional_steering_file = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--dir-steering-ffn")) {
            c.engine.directional_steering_ffn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "--dir-steering-attn")) {
            c.engine.directional_steering_attn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "-t") || !strcmp(arg, "--threads")) {
            c.engine.n_threads = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--backend")) {
            c.engine.backend = parse_backend(need_arg(&i, argc, argv, arg));
        } else if (!strcmp(arg, "--cpu")) {
            c.engine.backend = DS4_BACKEND_CPU;
        } else if (!strcmp(arg, "--metal")) {
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--cuda")) {
            c.engine.backend = DS4_BACKEND_CUDA;
        } else if (!strcmp(arg, "--dump-tokens")) {
            c.gen.dump_tokens = true;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
e.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--mtp-margin")) {
            c.engine.mtp_margin = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1000.0f);
        } else if (!strcmp(arg, "-n") || !strcmp(arg, "--tokens")) {
            c.gen.n_predict = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "-c") || !strcmp(arg, "--ctx")) {
            c.gen.ctx_size = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--temp")) {
            c.gen.temperature = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 100.0f);
        } else if (!strcmp(arg, "--top-p")) {
            c.gen.top_p = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1.0f);
        } else if (!strcmp(arg, "--seed")) {
            c.gen.seed = parse_u64(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--quality")) {
            c.engine.quality = true;
        } else if (!strcmp(arg, "--dir-steering-file")) {
            c.engine.directional_steering_file = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--dir-steering-ffn")) {
            c.engine.directional_steering_ffn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "--dir-steering-attn")) {
            c.engine.directional_steering_attn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "-t") || !strcmp(arg, "--threads")) {
            c.engine.n_threads = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--backend")) {
            c.engine.backend = parse_backend(need_arg(&i, argc, argv, arg));
        } else if (!strcmp(arg, "--cpu")) {
            c.engine.backend = DS4_BACKEND_CPU;
        } else if (!strcmp(arg, "--metal")) {
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--cuda")) {
            c.engine.backend = DS4_BACKEND_CUDA;
        } else if (!strcmp(arg, "--dump-tokens")) {
            c.gen.dump_tokens = true;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
e.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--mtp-margin")) {
            c.engine.mtp_margin = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1000.0f);
        } else if (!strcmp(arg, "-n") || !strcmp(arg, "--tokens")) {
            c.gen.n_predict = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "-c") || !strcmp(arg, "--ctx")) {
            c.gen.ctx_size = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--temp")) {
            c.gen.temperature = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 100.0f);
        } else if (!strcmp(arg, "--top-p")) {
            c.gen.top_p = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1.0f);
        } else if (!strcmp(arg, "--seed")) {
            c.gen.seed = parse_u64(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--quality")) {
            c.engine.quality = true;
        } else if (!strcmp(arg, "--dir-steering-file")) {
            c.engine.directional_steering_file = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--dir-steering-ffn")) {
            c.engine.directional_steering_ffn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "--dir-steering-attn")) {
            c.engine.directional_steering_attn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "-t") || !strcmp(arg, "--threads")) {
            c.engine.n_threads = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--backend")) {
            c.engine.backend = parse_backend(need_arg(&i, argc, argv, arg));
        } else if (!strcmp(arg, "--cpu")) {
            c.engine.backend = DS4_BACKEND_CPU;
        } else if (!strcmp(arg, "--metal")) {
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--cuda")) {
            c.engine.backend = DS4_BACKEND_CUDA;
        } else if (!strcmp(arg, "--dump-tokens")) {
            c.gen.dump_tokens = true;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
e.mtp_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--mtp-draft")) {
            c.engine.mtp_draft_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--mtp-margin")) {
            c.engine.mtp_margin = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1000.0f);
        } else if (!strcmp(arg, "-n") || !strcmp(arg, "--tokens")) {
            c.gen.n_predict = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "-c") || !strcmp(arg, "--ctx")) {
            c.gen.ctx_size = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--temp")) {
            c.gen.temperature = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 100.0f);
        } else if (!strcmp(arg, "--top-p")) {
            c.gen.top_p = parse_float_range(need_arg(&i, argc, argv, arg), arg, 0.0f, 1.0f);
        } else if (!strcmp(arg, "--seed")) {
            c.gen.seed = parse_u64(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--quality")) {
            c.engine.quality = true;
        } else if (!strcmp(arg, "--dir-steering-file")) {
            c.engine.directional_steering_file = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--dir-steering-ffn")) {
            c.engine.directional_steering_ffn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "--dir-steering-attn")) {
            c.engine.directional_steering_attn = parse_float_range(need_arg(&i, argc, argv, arg), arg, -100.0f, 100.0f);
            directional_steering_scale_set = true;
        } else if (!strcmp(arg, "-t") || !strcmp(arg, "--threads")) {
            c.engine.n_threads = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--backend")) {
            c.engine.backend = parse_backend(need_arg(&i, argc, argv, arg));
        } else if (!strcmp(arg, "--cpu")) {
            c.engine.backend = DS4_BACKEND_CPU;
        } else if (!strcmp(arg, "--metal")) {
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--cuda")) {
            c.engine.backend = DS4_BACKEND_CUDA;
        } else if (!strcmp(arg, "--dump-tokens")) {
            c.gen.dump_tokens = true;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
rt assistant turns with </think> for direct non-thinking replies.\n"
        "\n"
        "Interactive commands:\n"
        "  /help\n"
        "      Show interactive commands.\n"
        "  /think, /think-max, /nothink\n"
        "      Select normal thinking, context-gated Think Max, or non-thinking mode.\n"
        "  /ctx N\n"
        "      Recreate the interactive session with a new context size.\n"
        "  /read FILE\n"
        "      Read a prompt from FILE and run it as the next user message.\n"
        "  /quit, /exit\n"
        "      Leave the interactive prompt.\n"
        "  Ctrl+C\n"
        "      Stop the current generation and return to ds4> without exiting.\n"
        "\n"
        "Diagnostics:\n"
        "  --inspect\n"
        "      Load the model and print a summary only.\n"
        "  --dump-tokens\n"
        "      Tokenize -p/--prompt-file exactly as written, then exit without inference.\n"
        "  --dump-logprobs FILE\n"
        "      Write greedy continuation top-logprobs as JSON without printing text.\n"
        "  --logprobs-top-k N\n"
        "      Number of local alternatives stored by --dump-logprobs. Default: 20\n"
        "  --imatrix-dataset FILE\n"
        "      Rendered DS4 prompt dataset produced by misc/imatrix_dataset.\n"
        "  --imatrix-out FILE\n"
        "      Collect a routed-MoE activation imatrix and write llama-compatible .dat.\n"
        "  --imatrix-max-prompts N\n"
        "      Stop imatrix collection after N prompts. Default: no prompt limit\n"
        "  --imatrix-max-tokens N\n"
        "      Stop imatrix collection after N prompt tokens. Default: no token limit\n"
        "  --head-test\n"
        "      Run the output HC/logits head after the native slice.\n"
        "  --first-token-test\n"
        "      Run an exact CPU whole-model pass for the first prompt token.\n"
        "  --metal-graph-test\n"
        "      Compare first GPU-resident graph stages with CPU.\n"
        "  --metal-graph-full-test\n"
        "      Run the GPU-resident self-token graph across all layers.\n"
        "  --metal-graph-prompt-test\n"
        "      Compare CPU and GPU graph logits for the full prompt.\n"
        "\n"
        "Normal CLI commands:\n"
        "  ./ds4\n"
        "  ./ds4 -p \"Scrivi una storia su una papera scansafatiche\"\n"
        "  ./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
rt assistant turns with </think> for direct non-thinking replies.\n"
        "\n"
        "Interactive commands:\n"
        "  /help\n"
        "      Show interactive commands.\n"
        "  /think, /think-max, /nothink\n"
        "      Select normal thinking, context-gated Think Max, or non-thinking mode.\n"
        "  /ctx N\n"
        "      Recreate the interactive session with a new context size.\n"
        "  /read FILE\n"
        "      Read a prompt from FILE and run it as the next user message.\n"
        "  /quit, /exit\n"
        "      Leave the interactive prompt.\n"
        "  Ctrl+C\n"
        "      Stop the current generation and return to ds4> without exiting.\n"
        "\n"
        "Diagnostics:\n"
        "  --inspect\n"
        "      Load the model and print a summary only.\n"
        "  --dump-tokens\n"
        "      Tokenize -p/--prompt-file exactly as written, then exit without inference.\n"
        "  --dump-logprobs FILE\n"
        "      Write greedy continuation top-logprobs as JSON without printing text.\n"
        "  --logprobs-top-k N\n"
        "      Number of local alternatives stored by --dump-logprobs. Default: 20\n"
        "  --imatrix-dataset FILE\n"
        "      Rendered DS4 prompt dataset produced by misc/imatrix_dataset.\n"
        "  --imatrix-out FILE\n"
        "      Collect a routed-MoE activation imatrix and write llama-compatible .dat.\n"
        "  --imatrix-max-prompts N\n"
        "      Stop imatrix collection after N prompts. Default: no prompt limit\n"
        "  --imatrix-max-tokens N\n"
        "      Stop imatrix collection after N prompt tokens. Default: no token limit\n"
        "  --head-test\n"
        "      Run the output HC/logits head after the native slice.\n"
        "  --first-token-test\n"
        "      Run an exact CPU whole-model pass for the first prompt token.\n"
        "  --metal-graph-test\n"
        "      Compare first GPU-resident graph stages with CPU.\n"
        "  --metal-graph-full-test\n"
        "      Run the GPU-resident self-token graph across all layers.\n"
        "  --metal-graph-prompt-test\n"
        "      Compare CPU and GPU graph logits for the full prompt.\n"
        "\n"
        "Normal CLI commands:\n"
        "  ./ds4\n"
        "  ./ds4 -p \"Scrivi una storia su una papera scansafatiche\"\n"
        "  ./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
rt assistant turns with </think> for direct non-thinking replies.\n"
        "\n"
        "Interactive commands:\n"
        "  /help\n"
        "      Show interactive commands.\n"
        "  /think, /think-max, /nothink\n"
        "      Select normal thinking, context-gated Think Max, or non-thinking mode.\n"
        "  /ctx N\n"
        "      Recreate the interactive session with a new context size.\n"
        "  /read FILE\n"
        "      Read a prompt from FILE and run it as the next user message.\n"
        "  /quit, /exit\n"
        "      Leave the interactive prompt.\n"
        "  Ctrl+C\n"
        "      Stop the current generation and return to ds4> without exiting.\n"
        "\n"
        "Diagnostics:\n"
        "  --inspect\n"
        "      Load the model and print a summary only.\n"
        "  --dump-tokens\n"
        "      Tokenize -p/--prompt-file exactly as written, then exit without inference.\n"
        "  --dump-logprobs FILE\n"
        "      Write greedy continuation top-logprobs as JSON without printing text.\n"
        "  --logprobs-top-k N\n"
        "      Number of local alternatives stored by --dump-logprobs. Default: 20\n"
        "  --imatrix-dataset FILE\n"
        "      Rendered DS4 prompt dataset produced by misc/imatrix_dataset.\n"
        "  --imatrix-out FILE\n"
        "      Collect a routed-MoE activation imatrix and write llama-compatible .dat.\n"
        "  --imatrix-max-prompts N\n"
        "      Stop imatrix collection after N prompts. Default: no prompt limit\n"
        "  --imatrix-max-tokens N\n"
        "      Stop imatrix collection after N prompt tokens. Default: no token limit\n"
        "  --head-test\n"
        "      Run the output HC/logits head after the native slice.\n"
        "  --first-token-test\n"
        "      Run an exact CPU whole-model pass for the first prompt token.\n"
        "  --metal-graph-test\n"
        "      Compare first GPU-resident graph stages with CPU.\n"
        "  --metal-graph-full-test\n"
        "      Run the GPU-resident self-token graph across all layers.\n"
        "  --metal-graph-prompt-test\n"
        "      Compare CPU and GPU graph logits for the full prompt.\n"
        "\n"
        "Normal CLI commands:\n"
        "  ./ds4\n"
        "  ./ds4 -p \"Scrivi una storia su una papera scansafatiche\"\n"
        "  ./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
rt assistant turns with </think> for direct non-thinking replies.\n"
        "\n"
        "Interactive commands:\n"
        "  /help\n"
        "      Show interactive commands.\n"
        "  /think, /think-max, /nothink\n"
        "      Select normal thinking, context-gated Think Max, or non-thinking mode.\n"
        "  /ctx N\n"
        "      Recreate the interactive session with a new context size.\n"
        "  /read FILE\n"
        "      Read a prompt from FILE and run it as the next user message.\n"
        "  /quit, /exit\n"
        "      Leave the interactive prompt.\n"
        "  Ctrl+C\n"
        "      Stop the current generation and return to ds4> without exiting.\n"
        "\n"
        "Diagnostics:\n"
        "  --inspect\n"
        "      Load the model and print a summary only.\n"
        "  --dump-tokens\n"
        "      Tokenize -p/--prompt-file exactly as written, then exit without inference.\n"
        "  --dump-logprobs FILE\n"
        "      Write greedy continuation top-logprobs as JSON without printing text.\n"
        "  --logprobs-top-k N\n"
        "      Number of local alternatives stored by --dump-logprobs. Default: 20\n"
        "  --imatrix-dataset FILE\n"
        "      Rendered DS4 prompt dataset produced by misc/imatrix_dataset.\n"
        "  --imatrix-out FILE\n"
        "      Collect a routed-MoE activation imatrix and write llama-compatible .dat.\n"
        "  --imatrix-max-prompts N\n"
        "      Stop imatrix collection after N prompts. Default: no prompt limit\n"
        "  --imatrix-max-tokens N\n"
        "      Stop imatrix collection after N prompt tokens. Default: no token limit\n"
        "  --head-test\n"
        "      Run the output HC/logits head after the native slice.\n"
        "  --first-token-test\n"
        "      Run an exact CPU whole-model pass for the first prompt token.\n"
        "  --metal-graph-test\n"
        "      Compare first GPU-resident graph stages with CPU.\n"
        "  --metal-graph-full-test\n"
        "      Run the GPU-resident self-token graph across all layers.\n"
        "  --metal-graph-prompt-test\n"
        "      Compare CPU and GPU graph logits for the full prompt.\n"
        "\n"
        "Normal CLI commands:\n"
        "  ./ds4\n"
        "  ./ds4 -p \"Scrivi una storia su una papera scansafatiche\"\n"
        "  ./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
            c.gen.dump_logprobs_top_k = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-dataset")) {
            c.gen.imatrix_dataset_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--imatrix-out")) {
            c.gen.imatrix_output_path = need_arg(&i, argc, argv, arg);
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--imatrix-max-prompts")) {
            c.gen.imatrix_max_prompts = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-max-tokens")) {
            c.gen.imatrix_max_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--think")) {
            c.gen.think_mode = DS4_THINK_HIGH;
        } else if (!strcmp(arg, "--think-max")) {
            c.gen.think_mode = DS4_THINK_MAX;
        } else if (!strcmp(arg, "--nothink")) {
            c.gen.think_mode = DS4_THINK_NONE;
        } else if (!strcmp(arg, "--head-test")) {
            c.gen.head_test = true;
        } else if (!strcmp(arg, "--first-token-test")) {
            c.gen.first_token_test = true;
        } else if (!strcmp(arg, "--metal-graph-test")) {
            c.gen.metal_graph_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-full-test")) {
            c.gen.metal_graph_full_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-prompt-test")) {
            c.gen.metal_graph_prompt_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-generate")) {
            fprintf(stderr, "ds4: --metal-graph-generate was removed; --metal is the graph path\n");
            exit(2);
        } else if (!strcmp(arg, "--inspect")) {
            c.inspect = true;
        } else if (!strcmp(arg, "--warm-weights")) {
            c.engine.warm_weights = true;
        } else if (!strcmp(arg, "--server")) {
            fprintf(stderr, "ds4: use ds4-server for the HTTP server\n");
            exit(2);
        } else {
            fprintf(stderr, "ds4: unknown option: %s\n", arg);
            usage(stderr);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
            c.gen.dump_logprobs_top_k = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-dataset")) {
            c.gen.imatrix_dataset_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--imatrix-out")) {
            c.gen.imatrix_output_path = need_arg(&i, argc, argv, arg);
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--imatrix-max-prompts")) {
            c.gen.imatrix_max_prompts = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-max-tokens")) {
            c.gen.imatrix_max_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--think")) {
            c.gen.think_mode = DS4_THINK_HIGH;
        } else if (!strcmp(arg, "--think-max")) {
            c.gen.think_mode = DS4_THINK_MAX;
        } else if (!strcmp(arg, "--nothink")) {
            c.gen.think_mode = DS4_THINK_NONE;
        } else if (!strcmp(arg, "--head-test")) {
            c.gen.head_test = true;
        } else if (!strcmp(arg, "--first-token-test")) {
            c.gen.first_token_test = true;
        } else if (!strcmp(arg, "--metal-graph-test")) {
            c.gen.metal_graph_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-full-test")) {
            c.gen.metal_graph_full_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-prompt-test")) {
            c.gen.metal_graph_prompt_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-generate")) {
            fprintf(stderr, "ds4: --metal-graph-generate was removed; --metal is the graph path\n");
            exit(2);
        } else if (!strcmp(arg, "--inspect")) {
            c.inspect = true;
        } else if (!strcmp(arg, "--warm-weights")) {
            c.engine.warm_weights = true;
        } else if (!strcmp(arg, "--server")) {
            fprintf(stderr, "ds4: use ds4-server for the HTTP server\n");
            exit(2);
        } else {
            fprintf(stderr, "ds4: unknown option: %s\n", arg);
            usage(stderr);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
            c.gen.dump_logprobs_top_k = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-dataset")) {
            c.gen.imatrix_dataset_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--imatrix-out")) {
            c.gen.imatrix_output_path = need_arg(&i, argc, argv, arg);
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--imatrix-max-prompts")) {
            c.gen.imatrix_max_prompts = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-max-tokens")) {
            c.gen.imatrix_max_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--think")) {
            c.gen.think_mode = DS4_THINK_HIGH;
        } else if (!strcmp(arg, "--think-max")) {
            c.gen.think_mode = DS4_THINK_MAX;
        } else if (!strcmp(arg, "--nothink")) {
            c.gen.think_mode = DS4_THINK_NONE;
        } else if (!strcmp(arg, "--head-test")) {
            c.gen.head_test = true;
        } else if (!strcmp(arg, "--first-token-test")) {
            c.gen.first_token_test = true;
        } else if (!strcmp(arg, "--metal-graph-test")) {
            c.gen.metal_graph_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-full-test")) {
            c.gen.metal_graph_full_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-prompt-test")) {
            c.gen.metal_graph_prompt_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-generate")) {
            fprintf(stderr, "ds4: --metal-graph-generate was removed; --metal is the graph path\n");
            exit(2);
        } else if (!strcmp(arg, "--inspect")) {
            c.inspect = true;
        } else if (!strcmp(arg, "--warm-weights")) {
            c.engine.warm_weights = true;
        } else if (!strcmp(arg, "--server")) {
            fprintf(stderr, "ds4: use ds4-server for the HTTP server\n");
            exit(2);
        } else {
            fprintf(stderr, "ds4: unknown option: %s\n", arg);
            usage(stderr);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
;
        } else if (!strcmp(arg, "--dump-logprobs")) {
            c.gen.dump_logprobs_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--logprobs-top-k")) {
            c.gen.dump_logprobs_top_k = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-dataset")) {
            c.gen.imatrix_dataset_path = need_arg(&i, argc, argv, arg);
        } else if (!strcmp(arg, "--imatrix-out")) {
            c.gen.imatrix_output_path = need_arg(&i, argc, argv, arg);
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--imatrix-max-prompts")) {
            c.gen.imatrix_max_prompts = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--imatrix-max-tokens")) {
            c.gen.imatrix_max_tokens = parse_int(need_arg(&i, argc, argv, arg), arg);
        } else if (!strcmp(arg, "--think")) {
            c.gen.think_mode = DS4_THINK_HIGH;
        } else if (!strcmp(arg, "--think-max")) {
            c.gen.think_mode = DS4_THINK_MAX;
        } else if (!strcmp(arg, "--nothink")) {
            c.gen.think_mode = DS4_THINK_NONE;
        } else if (!strcmp(arg, "--head-test")) {
            c.gen.head_test = true;
        } else if (!strcmp(arg, "--first-token-test")) {
            c.gen.first_token_test = true;
        } else if (!strcmp(arg, "--metal-graph-test")) {
            c.gen.metal_graph_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-full-test")) {
            c.gen.metal_graph_full_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-prompt-test")) {
            c.gen.metal_graph_prompt_test = true;
            c.engine.backend = DS4_BACKEND_METAL;
        } else if (!strcmp(arg, "--metal-graph-generate")) {
            fprintf(stderr, "ds4: --metal-graph-generate was removed; --metal is the graph path\n");
            exit(2);
        } else if (!strcmp(arg, "--inspect")) {
            c.inspect = true;
        } else if (!strcmp(arg, "--warm-weights")) {
            c.engine.warm_weights = true;
        } else if (!strcmp(arg, "--server")) {
            fprintf(stderr, "ds4: use ds4-server for the HTTP server\n");
            exit(2);
        } else {
            fprintf(stderr, "ds4: unknown option: %s\n", arg);
            usage(stderr);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
err);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
    if (c.gen.imatrix_output_path && !c.gen.imatrix_dataset_path) {
        fprintf(stderr, "ds4: --imatrix-out requires --imatrix-dataset\n");
        exit(2);
    }
    if (c.gen.imatrix_dataset_path && !c.gen.imatrix_output_path) {
        fprintf(stderr, "ds4: --imatrix-dataset requires --imatrix-out\n");
        exit(2);
    }

    return c;
}

int main(int argc, char **argv) {
    cli_config cfg = parse_options(argc, argv);
    if (cfg.gen.dump_tokens) {
        if (cfg.gen.prompt == NULL) {
            fprintf(stderr, "ds4: --dump-tokens requires -p or --prompt-file\n");
            free(cfg.prompt_owned);
            return 2;
        }
        int rc = ds4_dump_text_tokenization(cfg.engine.model_path,
                                            cfg.gen.prompt,
                                            stdout);
        free(cfg.prompt_owned);
        return rc;
    }
    if (!cfg.inspect) {
        log_context_memory(cfg.engine.backend, cfg.gen.ctx_size);
        cli_warn_think_max_downgraded(&cfg.gen, "--think-max");
    }
    ds4_engine *engine = NULL;
    if (ds4_engine_open(&engine, &cfg.engine) != 0) {
        free(cfg.prompt_owned);
        return 1;
    }
    int rc = 0;
    if (cfg.inspect) {
        ds4_engine_summary(engine);
    } else if (cfg.gen.imatrix_output_path) {
        rc = ds4_engine_collect_imatrix(engine,
                                        cfg.gen.imatrix_dataset_path,
                                        cfg.gen.imatrix_output_path,
                                        cfg.gen.ctx_size,
                                        cfg.gen.imatrix_max_prompts,
                                        cfg.gen.imatrix_max_tokens);
    } else if (cfg.gen.prompt == NULL) {
        rc = run_repl(engine, &cfg);
    } else {
        rc = run_generation(engine, &cfg);
    }
    ds4_engine_close(engine);
    free(cfg.prompt_owned);
    return rc;
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
err);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
    if (c.gen.imatrix_output_path && !c.gen.imatrix_dataset_path) {
        fprintf(stderr, "ds4: --imatrix-out requires --imatrix-dataset\n");
        exit(2);
    }
    if (c.gen.imatrix_dataset_path && !c.gen.imatrix_output_path) {
        fprintf(stderr, "ds4: --imatrix-dataset requires --imatrix-out\n");
        exit(2);
    }

    return c;
}

int main(int argc, char **argv) {
    cli_config cfg = parse_options(argc, argv);
    if (cfg.gen.dump_tokens) {
        if (cfg.gen.prompt == NULL) {
            fprintf(stderr, "ds4: --dump-tokens requires -p or --prompt-file\n");
            free(cfg.prompt_owned);
            return 2;
        }
        int rc = ds4_dump_text_tokenization(cfg.engine.model_path,
                                            cfg.gen.prompt,
                                            stdout);
        free(cfg.prompt_owned);
        return rc;
    }
    if (!cfg.inspect) {
        log_context_memory(cfg.engine.backend, cfg.gen.ctx_size);
        cli_warn_think_max_downgraded(&cfg.gen, "--think-max");
    }
    ds4_engine *engine = NULL;
    if (ds4_engine_open(&engine, &cfg.engine) != 0) {
        free(cfg.prompt_owned);
        return 1;
    }
    int rc = 0;
    if (cfg.inspect) {
        ds4_engine_summary(engine);
    } else if (cfg.gen.imatrix_output_path) {
        rc = ds4_engine_collect_imatrix(engine,
                                        cfg.gen.imatrix_dataset_path,
                                        cfg.gen.imatrix_output_path,
                                        cfg.gen.ctx_size,
                                        cfg.gen.imatrix_max_prompts,
                                        cfg.gen.imatrix_max_tokens);
    } else if (cfg.gen.prompt == NULL) {
        rc = run_repl(engine, &cfg);
    } else {
        rc = run_generation(engine, &cfg);
    }
    ds4_engine_close(engine);
    free(cfg.prompt_owned);
    return rc;
}
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
err);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
    if (c.gen.imatrix_output_path && !c.gen.imatrix_dataset_path) {
        fprintf(stderr, "ds4: --imatrix-out requires --imatrix-dataset\n");
        exit(2);
    }
    if (c.gen.imatrix_dataset_path && !c.gen.imatrix_output_path) {
        fprintf(stderr, "ds4: --imatrix-dataset requires --imatrix-out\n");
        exit(2);
    }

    return c;
}

int main(int argc, char **argv) {
    cli_config cfg = parse_options(argc, argv);
    if (cfg.gen.dump_tokens) {
        if (cfg.gen.prompt == NULL) {
            fprintf(stderr, "ds4: --dump-tokens requires -p or --prompt-file\n");
            free(cfg.prompt_owned);
            return 2;
        }
        int rc = ds4_dump_text_tokenization(cfg.engine.model_path,
                                            cfg.gen.prompt,
                                            stdout);
        free(cfg.prompt_owned);
        return rc;
    }
    if (!cfg.inspect) {
        log_context_memory(cfg.engine.backend, cfg.gen.ctx_size);
        cli_warn_think_max_downgraded(&cfg.gen, "--think-max");
    }
    ds4_engine *engine = NULL;
    if (ds4_engine_open(&engine, &cfg.engine) != 0) {
        free(cfg.prompt_owned);
        return 1;
    }
    int rc = 0;
    if (cfg.inspect) {
        ds4_engine_summary(engine);
    } else if (cfg.gen.imatrix_output_path) {
        rc = ds4_engine_collect_imatrix(engine,
                                        cfg.gen.imatrix_dataset_path,
                                        cfg.gen.imatrix_output_path,
                                        cfg.gen.ctx_size,
                                        cfg.gen.imatrix_max_prompts,
                                        cfg.gen.imatrix_max_tokens);
    } else if (cfg.gen.prompt == NULL) {
        rc = run_repl(engine, &cfg);
    } else {
        rc = run_generation(engine, &cfg);
    }
    ds4_engine_close(engine);
    free(cfg.prompt_owned);
    return rc;
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
err);
            exit(2);
        }
    }

    if (c.engine.directional_steering_file && !directional_steering_scale_set) {
        c.engine.directional_steering_ffn = 1.0f;
    }
    if (c.gen.imatrix_output_path && !c.gen.imatrix_dataset_path) {
        fprintf(stderr, "ds4: --imatrix-out requires --imatrix-dataset\n");
        exit(2);
    }
    if (c.gen.imatrix_dataset_path && !c.gen.imatrix_output_path) {
        fprintf(stderr, "ds4: --imatrix-dataset requires --imatrix-out\n");
        exit(2);
    }

    return c;
}

int main(int argc, char **argv) {
    cli_config cfg = parse_options(argc, argv);
    if (cfg.gen.dump_tokens) {
        if (cfg.gen.prompt == NULL) {
            fprintf(stderr, "ds4: --dump-tokens requires -p or --prompt-file\n");
            free(cfg.prompt_owned);
            return 2;
        }
        int rc = ds4_dump_text_tokenization(cfg.engine.model_path,
                                            cfg.gen.prompt,
                                            stdout);
        free(cfg.prompt_owned);
        return rc;
    }
    if (!cfg.inspect) {
        log_context_memory(cfg.engine.backend, cfg.gen.ctx_size);
        cli_warn_think_max_downgraded(&cfg.gen, "--think-max");
    }
    ds4_engine *engine = NULL;
    if (ds4_engine_open(&engine, &cfg.engine) != 0) {
        free(cfg.prompt_owned);
        return 1;
    }
    int rc = 0;
    if (cfg.inspect) {
        ds4_engine_summary(engine);
    } else if (cfg.gen.imatrix_output_path) {
        rc = ds4_engine_collect_imatrix(engine,
                                        cfg.gen.imatrix_dataset_path,
                                        cfg.gen.imatrix_output_path,
                                        cfg.gen.ctx_size,
                                        cfg.gen.imatrix_max_prompts,
                                        cfg.gen.imatrix_max_tokens);
    } else if (cfg.gen.prompt == NULL) {
        rc = run_repl(engine, &cfg);
    } else {
        rc = run_generation(engine, &cfg);
    }
    ds4_engine_close(engine);
    free(cfg.prompt_owned);
    return rc;
}
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
        "  CPU mode supports interactive chat too, but it is a slow reference/debug path.\n"
        "  Long added input is processed with batched prefill; short continuations use decode.\n"
        "  Startup prints the extra context-buffer memory for the selected context size.\n"
        "\n"
        "  -h, --help\n"
        "      Show this help.\n");
}

static int parse_int(const char *s, const char *opt) {
    char *end = NULL;
    long v = strtol(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v <= 0 || v > INT32_MAX) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (int)v;
}

static uint64_t parse_u64(const char *s, const char *opt) {
    char *end = NULL;
    unsigned long long v = strtoull(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v == 0) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (uint64_t)v;
}

static float parse_float_range(const char *s, const char *opt, float min, float max) {
    char *end = NULL;
    float v = strtof(s, &end);
    if (s[0] == '\0' || *end != '\0' || !isfinite(v) || v < min || v > max) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return v;
}

static ds4_backend parse_backend(const char *s) {
    if (!strcmp(s, "metal")) return DS4_BACKEND_METAL;
    if (!strcmp(s, "cuda")) return DS4_BACKEND_CUDA;
    if (!strcmp(s, "cpu")) return DS4_BACKEND_CPU;
    fprintf(stderr, "ds4: invalid backend: %s\n", s);
    fprintf(stderr, "ds4: valid backends are: metal, cuda, cpu\n");
    exit(2);
}

static ds4_backend default_backend(void) {
#ifdef DS4_NO_GPU
    return DS4_BACKEND_CPU;
#elif defined(__APPLE__)
    return DS4_BACKEND_METAL;
#else
    return DS4_BACKEND_CUDA;
#endif
}

static void log_context_memory(ds4_backend backend, int ctx_size) {
    ds4_context_memory m = ds4_context_memory_estimate(backend, ctx_size);
    fprintf(stderr,
            "ds4: context buffers %.2f MiB (ctx=%d, backend=%s, prefill_chunk=%u, raw_kv_rows=%u, compressed_kv_rows=%u)\n",
            (double)m.total_bytes / (1024.0 * 1024.0),
            ctx_size,
            ds4_backend_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
        "  CPU mode supports interactive chat too, but it is a slow reference/debug path.\n"
        "  Long added input is processed with batched prefill; short continuations use decode.\n"
        "  Startup prints the extra context-buffer memory for the selected context size.\n"
        "\n"
        "  -h, --help\n"
        "      Show this help.\n");
}

static int parse_int(const char *s, const char *opt) {
    char *end = NULL;
    long v = strtol(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v <= 0 || v > INT32_MAX) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (int)v;
}

static uint64_t parse_u64(const char *s, const char *opt) {
    char *end = NULL;
    unsigned long long v = strtoull(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v == 0) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (uint64_t)v;
}

static float parse_float_range(const char *s, const char *opt, float min, float max) {
    char *end = NULL;
    float v = strtof(s, &end);
    if (s[0] == '\0' || *end != '\0' || !isfinite(v) || v < min || v > max) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return v;
}

static ds4_backend parse_backend(const char *s) {
    if (!strcmp(s, "metal")) return DS4_BACKEND_METAL;
    if (!strcmp(s, "cuda")) return DS4_BACKEND_CUDA;
    if (!strcmp(s, "cpu")) return DS4_BACKEND_CPU;
    fprintf(stderr, "ds4: invalid backend: %s\n", s);
    fprintf(stderr, "ds4: valid backends are: metal, cuda, cpu\n");
    exit(2);
}

static ds4_backend default_backend(void) {
#ifdef DS4_NO_GPU
    return DS4_BACKEND_CPU;
#elif defined(__APPLE__)
    return DS4_BACKEND_METAL;
#else
    return DS4_BACKEND_CUDA;
#endif
}

static void log_context_memory(ds4_backend backend, int ctx_size) {
    ds4_context_memory m = ds4_context_memory_estimate(backend, ctx_size);
    fprintf(stderr,
            "ds4: context buffers %.2f MiB (ctx=%d, backend=%s, prefill_chunk=%u, raw_kv_rows=%u, compressed_kv_rows=%u)\n",
            (double)m.total_bytes / (1024.0 * 1024.0),
            ctx_size,
            ds4_backend_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
        "  CPU mode supports interactive chat too, but it is a slow reference/debug path.\n"
        "  Long added input is processed with batched prefill; short continuations use decode.\n"
        "  Startup prints the extra context-buffer memory for the selected context size.\n"
        "\n"
        "  -h, --help\n"
        "      Show this help.\n");
}

static int parse_int(const char *s, const char *opt) {
    char *end = NULL;
    long v = strtol(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v <= 0 || v > INT32_MAX) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (int)v;
}

static uint64_t parse_u64(const char *s, const char *opt) {
    char *end = NULL;
    unsigned long long v = strtoull(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v == 0) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (uint64_t)v;
}

static float parse_float_range(const char *s, const char *opt, float min, float max) {
    char *end = NULL;
    float v = strtof(s, &end);
    if (s[0] == '\0' || *end != '\0' || !isfinite(v) || v < min || v > max) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return v;
}

static ds4_backend parse_backend(const char *s) {
    if (!strcmp(s, "metal")) return DS4_BACKEND_METAL;
    if (!strcmp(s, "cuda")) return DS4_BACKEND_CUDA;
    if (!strcmp(s, "cpu")) return DS4_BACKEND_CPU;
    fprintf(stderr, "ds4: invalid backend: %s\n", s);
    fprintf(stderr, "ds4: valid backends are: metal, cuda, cpu\n");
    exit(2);
}

static ds4_backend default_backend(void) {
#ifdef DS4_NO_GPU
    return DS4_BACKEND_CPU;
#elif defined(__APPLE__)
    return DS4_BACKEND_METAL;
#else
    return DS4_BACKEND_CUDA;
#endif
}

static void log_context_memory(ds4_backend backend, int ctx_size) {
    ds4_context_memory m = ds4_context_memory_estimate(backend, ctx_size);
    fprintf(stderr,
            "ds4: context buffers %.2f MiB (ctx=%d, backend=%s, prefill_chunk=%u, raw_kv_rows=%u, compressed_kv_rows=%u)\n",
            (double)m.total_bytes / (1024.0 * 1024.0),
            ctx_size,
            ds4_backend_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_cli.c

```c
./ds4 --think-max --prompt-file prompt.txt --ctx 393216\n"
        "\n"
        "Notes:\n"
        "  The CLI keeps KV cache state across interactive turns on session backends.\n"
        "  CPU mode supports interactive chat too, but it is a slow reference/debug path.\n"
        "  Long added input is processed with batched prefill; short continuations use decode.\n"
        "  Startup prints the extra context-buffer memory for the selected context size.\n"
        "\n"
        "  -h, --help\n"
        "      Show this help.\n");
}

static int parse_int(const char *s, const char *opt) {
    char *end = NULL;
    long v = strtol(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v <= 0 || v > INT32_MAX) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (int)v;
}

static uint64_t parse_u64(const char *s, const char *opt) {
    char *end = NULL;
    unsigned long long v = strtoull(s, &end, 10);
    if (s[0] == '\0' || *end != '\0' || v == 0) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return (uint64_t)v;
}

static float parse_float_range(const char *s, const char *opt, float min, float max) {
    char *end = NULL;
    float v = strtof(s, &end);
    if (s[0] == '\0' || *end != '\0' || !isfinite(v) || v < min || v > max) {
        fprintf(stderr, "ds4: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return v;
}

static ds4_backend parse_backend(const char *s) {
    if (!strcmp(s, "metal")) return DS4_BACKEND_METAL;
    if (!strcmp(s, "cuda")) return DS4_BACKEND_CUDA;
    if (!strcmp(s, "cpu")) return DS4_BACKEND_CPU;
    fprintf(stderr, "ds4: invalid backend: %s\n", s);
    fprintf(stderr, "ds4: valid backends are: metal, cuda, cpu\n");
    exit(2);
}

static ds4_backend default_backend(void) {
#ifdef DS4_NO_GPU
    return DS4_BACKEND_CPU;
#elif defined(__APPLE__)
    return DS4_BACKEND_METAL;
#else
    return DS4_BACKEND_CUDA;
#endif
}

static void log_context_memory(ds4_backend backend, int ctx_size) {
    ds4_context_memory m = ds4_context_memory_estimate(backend, ctx_size);
    fprintf(stderr,
            "ds4: context buffers %.2f MiB (ctx=%d, backend=%s, prefill_chunk=%u, raw_kv_rows=%u, compressed_kv_rows=%u)\n",
            (double)m.total_bytes / (1024.0 * 1024.0),
            ctx_size,
            ds4_backend_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
end_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
    return ds4_think_mode_for_context(gen->think_mode, gen->ctx_size);
}

static bool cli_think_max_downgraded(const cli_generation_options *gen) {
    return gen->think_mode == DS4_THINK_MAX &&
           cli_effective_think_mode(gen) != DS4_THINK_MAX;
}

static void cli_warn_think_max_downgraded(const cli_generation_options *gen, const char *name) {
    if (!cli_think_max_downgraded(gen)) return;
    ds4_log(stderr,
        DS4_LOG_WARNING,
        "ds4: warning: %s needs --ctx >= %u; ctx=%d uses normal thinking instead\n",
        name,
        ds4_think_max_min_context(),
        gen->ctx_size);
}

static double cli_now_sec(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (double)ts.tv_sec + (double)ts.tv_nsec * 1.0e-9;
}

static char *read_prompt_file(const char *path, bool fatal);

typedef struct {
    int base_tokens;
    int input_tokens;
    bool use_color;
} cli_prefill_progress;

static void cli_prefill_progress_cb(void *ud, const char *event, int current, int total) {
    (void)total;
    cli_prefill_progress *p = ud;
    if (!p || !event || strcmp(event, "prefill_chunk") || p->input_tokens <= 0) return;

    int processed = current - p->base_tokens;
    if (processed < 0) processed = 0;
    if (processed > p->input_tokens) processed = p->input_tokens;
    double pct = 100.0 * (double)processed / (double)p->input_tokens;
    if (pct > 100.0) pct = 100.0;

    if (p->use_color) {
        fputc('\r', stderr);
        ds4_log(stderr,
                DS4_LOG_PREFILL,
                "processing %d input tokens: %d/%d (%.1f%%)",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
        fputs("\x1b[K", stderr);
        if (processed >= p->input_tokens) fputc('\n', stderr);
    } else {
        fprintf(stderr,
                "processing %d input tokens: %d/%d (%.1f%%)\n",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
    }
    fflush(stderr);
}

static bool is_rendered_chat_prompt(const char *prompt) {
    const char *bos = "<｜begin▁of▁sentence｜>";
    return prompt && strncmp(prompt, bos, strlen(bos)) == 0;
}

typedef struct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
end_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
    return ds4_think_mode_for_context(gen->think_mode, gen->ctx_size);
}

static bool cli_think_max_downgraded(const cli_generation_options *gen) {
    return gen->think_mode == DS4_THINK_MAX &&
           cli_effective_think_mode(gen) != DS4_THINK_MAX;
}

static void cli_warn_think_max_downgraded(const cli_generation_options *gen, const char *name) {
    if (!cli_think_max_downgraded(gen)) return;
    ds4_log(stderr,
        DS4_LOG_WARNING,
        "ds4: warning: %s needs --ctx >= %u; ctx=%d uses normal thinking instead\n",
        name,
        ds4_think_max_min_context(),
        gen->ctx_size);
}

static double cli_now_sec(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (double)ts.tv_sec + (double)ts.tv_nsec * 1.0e-9;
}

static char *read_prompt_file(const char *path, bool fatal);

typedef struct {
    int base_tokens;
    int input_tokens;
    bool use_color;
} cli_prefill_progress;

static void cli_prefill_progress_cb(void *ud, const char *event, int current, int total) {
    (void)total;
    cli_prefill_progress *p = ud;
    if (!p || !event || strcmp(event, "prefill_chunk") || p->input_tokens <= 0) return;

    int processed = current - p->base_tokens;
    if (processed < 0) processed = 0;
    if (processed > p->input_tokens) processed = p->input_tokens;
    double pct = 100.0 * (double)processed / (double)p->input_tokens;
    if (pct > 100.0) pct = 100.0;

    if (p->use_color) {
        fputc('\r', stderr);
        ds4_log(stderr,
                DS4_LOG_PREFILL,
                "processing %d input tokens: %d/%d (%.1f%%)",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
        fputs("\x1b[K", stderr);
        if (processed >= p->input_tokens) fputc('\n', stderr);
    } else {
        fprintf(stderr,
                "processing %d input tokens: %d/%d (%.1f%%)\n",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
    }
    fflush(stderr);
}

static bool is_rendered_chat_prompt(const char *prompt) {
    const char *bos = "<｜begin▁of▁sentence｜>";
    return prompt && strncmp(prompt, bos, strlen(bos)) == 0;
}

typedef struct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
end_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
    return ds4_think_mode_for_context(gen->think_mode, gen->ctx_size);
}

static bool cli_think_max_downgraded(const cli_generation_options *gen) {
    return gen->think_mode == DS4_THINK_MAX &&
           cli_effective_think_mode(gen) != DS4_THINK_MAX;
}

static void cli_warn_think_max_downgraded(const cli_generation_options *gen, const char *name) {
    if (!cli_think_max_downgraded(gen)) return;
    ds4_log(stderr,
        DS4_LOG_WARNING,
        "ds4: warning: %s needs --ctx >= %u; ctx=%d uses normal thinking instead\n",
        name,
        ds4_think_max_min_context(),
        gen->ctx_size);
}

static double cli_now_sec(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (double)ts.tv_sec + (double)ts.tv_nsec * 1.0e-9;
}

static char *read_prompt_file(const char *path, bool fatal);

typedef struct {
    int base_tokens;
    int input_tokens;
    bool use_color;
} cli_prefill_progress;

static void cli_prefill_progress_cb(void *ud, const char *event, int current, int total) {
    (void)total;
    cli_prefill_progress *p = ud;
    if (!p || !event || strcmp(event, "prefill_chunk") || p->input_tokens <= 0) return;

    int processed = current - p->base_tokens;
    if (processed < 0) processed = 0;
    if (processed > p->input_tokens) processed = p->input_tokens;
    double pct = 100.0 * (double)processed / (double)p->input_tokens;
    if (pct > 100.0) pct = 100.0;

    if (p->use_color) {
        fputc('\r', stderr);
        ds4_log(stderr,
                DS4_LOG_PREFILL,
                "processing %d input tokens: %d/%d (%.1f%%)",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
        fputs("\x1b[K", stderr);
        if (processed >= p->input_tokens) fputc('\n', stderr);
    } else {
        fprintf(stderr,
                "processing %d input tokens: %d/%d (%.1f%%)\n",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
    }
    fflush(stderr);
}

static bool is_rendered_chat_prompt(const char *prompt) {
    const char *bos = "<｜begin▁of▁sentence｜>";
    return prompt && strncmp(prompt, bos, strlen(bos)) == 0;
}

typedef struct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_cli.c

```c
end_name(backend),
            m.prefill_cap,
            m.raw_cap,
            m.comp_cap);
}

static ds4_think_mode cli_effective_think_mode(const cli_generation_options *gen) {
    return ds4_think_mode_for_context(gen->think_mode, gen->ctx_size);
}

static bool cli_think_max_downgraded(const cli_generation_options *gen) {
    return gen->think_mode == DS4_THINK_MAX &&
           cli_effective_think_mode(gen) != DS4_THINK_MAX;
}

static void cli_warn_think_max_downgraded(const cli_generation_options *gen, const char *name) {
    if (!cli_think_max_downgraded(gen)) return;
    ds4_log(stderr,
        DS4_LOG_WARNING,
        "ds4: warning: %s needs --ctx >= %u; ctx=%d uses normal thinking instead\n",
        name,
        ds4_think_max_min_context(),
        gen->ctx_size);
}

static double cli_now_sec(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (double)ts.tv_sec + (double)ts.tv_nsec * 1.0e-9;
}

static char *read_prompt_file(const char *path, bool fatal);

typedef struct {
    int base_tokens;
    int input_tokens;
    bool use_color;
} cli_prefill_progress;

static void cli_prefill_progress_cb(void *ud, const char *event, int current, int total) {
    (void)total;
    cli_prefill_progress *p = ud;
    if (!p || !event || strcmp(event, "prefill_chunk") || p->input_tokens <= 0) return;

    int processed = current - p->base_tokens;
    if (processed < 0) processed = 0;
    if (processed > p->input_tokens) processed = p->input_tokens;
    double pct = 100.0 * (double)processed / (double)p->input_tokens;
    if (pct > 100.0) pct = 100.0;

    if (p->use_color) {
        fputc('\r', stderr);
        ds4_log(stderr,
                DS4_LOG_PREFILL,
                "processing %d input tokens: %d/%d (%.1f%%)",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
        fputs("\x1b[K", stderr);
        if (processed >= p->input_tokens) fputc('\n', stderr);
    } else {
        fprintf(stderr,
                "processing %d input tokens: %d/%d (%.1f%%)\n",
                p->input_tokens,
                processed,
                p->input_tokens,
                pct);
    }
    fflush(stderr);
}

static bool is_rendered_chat_prompt(const char *prompt) {
    const char *bos = "<｜begin▁of▁sentence｜>";
    return prompt && strncmp(prompt, bos, strlen(bos)) == 0;
}

typedef struct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
ct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
    size_t pending_len;
} token_printer;

static bool bytes_has_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n >= plen && memcmp(p, prefix, plen) == 0;
}

static bool bytes_is_partial_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n < plen && memcmp(prefix, p, n) == 0;
}

static void token_printer_set_grey(token_printer *p) {
    if (p->use_color && !p->color_open) {
        fputs("\x1b[90m", p->fp);
        p->color_open = true;
    }
}

static void token_printer_reset_color(token_printer *p) {
    if (p->use_color && p->color_open) {
        fputs("\x1b[0m", p->fp);
        p->color_open = false;
    }
}

static void token_printer_write_char(token_printer *p, char c) {
    if (p->in_think) token_printer_set_grey(p);
    fputc((unsigned char)c, p->fp);
    p->last_output_newline = c == '\n';
}

static void token_printer_process(token_printer *p, const char *text, size_t len, bool finish) {
    const char *think_open = "<think>";
    const char *think_close = "</think>";
    size_t total = p->pending_len + len;
    char *buf = malloc(total ? total : 1);
    if (!buf) return;
    if (p->pending_len) memcpy(buf, p->pending, p->pending_len);
    if (len) memcpy(buf + p->pending_len, text, len);
    p->pending_len = 0;

    size_t i = 0;
    while (i < total) {
        const char *cur = buf + i;
        const size_t rem = total - i;
        if (bytes_has_prefix(cur, rem, think_open)) {
            p->in_think = true;
            i += strlen(think_open);
            continue;
        }
        if (bytes_has_prefix(cur, rem, think_close)) {
            p->in_think = false;
            token_printer_reset_color(p);
            if (!p->last_output_newline) {
                fputc('\n', p->fp);
                p->last_output_newline = true;
            }
            i += strlen(think_close);
            continue;
        }
        if (!finish && cur[0] == '<' &&
            (bytes_is_partial_prefix(cur, rem, think_open) ||
             bytes_is_partial_prefix(cur, rem, think_close)))
        {
            if (rem < sizeof(p->pending)) {
                memcpy(p->pending, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
ct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
    size_t pending_len;
} token_printer;

static bool bytes_has_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n >= plen && memcmp(p, prefix, plen) == 0;
}

static bool bytes_is_partial_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n < plen && memcmp(prefix, p, n) == 0;
}

static void token_printer_set_grey(token_printer *p) {
    if (p->use_color && !p->color_open) {
        fputs("\x1b[90m", p->fp);
        p->color_open = true;
    }
}

static void token_printer_reset_color(token_printer *p) {
    if (p->use_color && p->color_open) {
        fputs("\x1b[0m", p->fp);
        p->color_open = false;
    }
}

static void token_printer_write_char(token_printer *p, char c) {
    if (p->in_think) token_printer_set_grey(p);
    fputc((unsigned char)c, p->fp);
    p->last_output_newline = c == '\n';
}

static void token_printer_process(token_printer *p, const char *text, size_t len, bool finish) {
    const char *think_open = "<think>";
    const char *think_close = "</think>";
    size_t total = p->pending_len + len;
    char *buf = malloc(total ? total : 1);
    if (!buf) return;
    if (p->pending_len) memcpy(buf, p->pending, p->pending_len);
    if (len) memcpy(buf + p->pending_len, text, len);
    p->pending_len = 0;

    size_t i = 0;
    while (i < total) {
        const char *cur = buf + i;
        const size_t rem = total - i;
        if (bytes_has_prefix(cur, rem, think_open)) {
            p->in_think = true;
            i += strlen(think_open);
            continue;
        }
        if (bytes_has_prefix(cur, rem, think_close)) {
            p->in_think = false;
            token_printer_reset_color(p);
            if (!p->last_output_newline) {
                fputc('\n', p->fp);
                p->last_output_newline = true;
            }
            i += strlen(think_close);
            continue;
        }
        if (!finish && cur[0] == '<' &&
            (bytes_is_partial_prefix(cur, rem, think_open) ||
             bytes_is_partial_prefix(cur, rem, think_close)))
        {
            if (rem < sizeof(p->pending)) {
                memcpy(p->pending, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
ct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
    size_t pending_len;
} token_printer;

static bool bytes_has_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n >= plen && memcmp(p, prefix, plen) == 0;
}

static bool bytes_is_partial_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n < plen && memcmp(prefix, p, n) == 0;
}

static void token_printer_set_grey(token_printer *p) {
    if (p->use_color && !p->color_open) {
        fputs("\x1b[90m", p->fp);
        p->color_open = true;
    }
}

static void token_printer_reset_color(token_printer *p) {
    if (p->use_color && p->color_open) {
        fputs("\x1b[0m", p->fp);
        p->color_open = false;
    }
}

static void token_printer_write_char(token_printer *p, char c) {
    if (p->in_think) token_printer_set_grey(p);
    fputc((unsigned char)c, p->fp);
    p->last_output_newline = c == '\n';
}

static void token_printer_process(token_printer *p, const char *text, size_t len, bool finish) {
    const char *think_open = "<think>";
    const char *think_close = "</think>";
    size_t total = p->pending_len + len;
    char *buf = malloc(total ? total : 1);
    if (!buf) return;
    if (p->pending_len) memcpy(buf, p->pending, p->pending_len);
    if (len) memcpy(buf + p->pending_len, text, len);
    p->pending_len = 0;

    size_t i = 0;
    while (i < total) {
        const char *cur = buf + i;
        const size_t rem = total - i;
        if (bytes_has_prefix(cur, rem, think_open)) {
            p->in_think = true;
            i += strlen(think_open);
            continue;
        }
        if (bytes_has_prefix(cur, rem, think_close)) {
            p->in_think = false;
            token_printer_reset_color(p);
            if (!p->last_output_newline) {
                fputc('\n', p->fp);
                p->last_output_newline = true;
            }
            i += strlen(think_close);
            continue;
        }
        if (!finish && cur[0] == '<' &&
            (bytes_is_partial_prefix(cur, rem, think_open) ||
             bytes_is_partial_prefix(cur, rem, think_close)))
        {
            if (rem < sizeof(p->pending)) {
                memcpy(p->pending, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_cli.c

```c
ct {
    ds4_engine *engine;
    FILE *fp;
    bool format_thinking;
    bool in_think;
    bool color_open;
    bool use_color;
    bool last_output_newline;
    char pending[16];
    size_t pending_len;
} token_printer;

static bool bytes_has_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n >= plen && memcmp(p, prefix, plen) == 0;
}

static bool bytes_is_partial_prefix(const char *p, size_t n, const char *prefix) {
    size_t plen = strlen(prefix);
    return n < plen && memcmp(prefix, p, n) == 0;
}

static void token_printer_set_grey(token_printer *p) {
    if (p->use_color && !p->color_open) {
        fputs("\x1b[90m", p->fp);
        p->color_open = true;
    }
}

static void token_printer_reset_color(token_printer *p) {
    if (p->use_color && p->color_open) {
        fputs("\x1b[0m", p->fp);
        p->color_open = false;
    }
}

static void token_printer_write_char(token_printer *p, char c) {
    if (p->in_think) token_printer_set_grey(p);
    fputc((unsigned char)c, p->fp);
    p->last_output_newline = c == '\n';
}

static void token_printer_process(token_printer *p, const char *text, size_t len, bool finish) {
    const char *think_open = "<think>";
    const char *think_close = "</think>";
    size_t total = p->pending_len + len;
    char *buf = malloc(total ? total : 1);
    if (!buf) return;
    if (p->pending_len) memcpy(buf, p->pending, p->pending_len);
    if (len) memcpy(buf + p->pending_len, text, len);
    p->pending_len = 0;

    size_t i = 0;
    while (i < total) {
        const char *cur = buf + i;
        const size_t rem = total - i;
        if (bytes_has_prefix(cur, rem, think_open)) {
            p->in_think = true;
            i += strlen(think_open);
            continue;
        }
        if (bytes_has_prefix(cur, rem, think_close)) {
            p->in_think = false;
            token_printer_reset_color(p);
            if (!p->last_output_newline) {
                fputc('\n', p->fp);
                p->last_output_newline = true;
            }
            i += strlen(think_close);
            continue;
        }
        if (!finish && cur[0] == '<' &&
            (bytes_is_partial_prefix(cur, rem, think_open) ||
             bytes_is_partial_prefix(cur, rem, think_close)))
        {
            if (rem < sizeof(p->pending)) {
                memcpy(p->pending, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
ding, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}

static void token_printer_finish(token_printer *p) {
    if (p->format_thinking) {
        token_printer_process(p, NULL, 0, true);
        token_printer_reset_color(p);
    }
    fflush(p->fp);
}

static void generation_done(void *ud) {
    token_printer *p = ud;
    token_printer_finish(p);
    if (!p->last_output_newline) {
        fputc('\n', p->fp);
        p->last_output_newline = true;
    }
    fflush(p->fp);
}

static void token_printer_write_text(token_printer *p, const char *text, size_t len) {
    if (p->format_thinking) {
        token_printer_process(p, text, len, false);
    } else if (len) {
        fwrite(text, 1, len, p->fp);
        p->last_output_newline = text[len - 1] == '\n';
    }
}

static void print_generated_token(void *ud, int token) {
    token_printer *p = ud;
    size_t len = 0;
    char *text = ds4_token_text(p->engine, token, &len);
    token_printer_write_text(p, text, len);
    fflush(p->fp);
    free(text);
}

static void build_prompt(ds4_engine *engine, const cli_generation_options *gen, ds4_tokens *out) {
    if (is_rendered_chat_prompt(gen->prompt)) {
        ds4_tokenize_rendered_chat(engine, gen->prompt, out);
    } else {
        ds4_encode_chat_prompt(engine, gen->system, gen->prompt,
                               cli_effective_think_mode(gen), out);
    }
}

static int run_sampled_generation(ds4_engine *engine, const cli_config *cfg, const ds4_tokens *prompt) {
    ds4_session *session = NULL;
    if (ds4_session_create(&session, engine, cfg->gen.ctx_size) != 0) {
        fprintf(stderr, "ds4: sampled CLI generation requires a session backend\n");
        return 1;
    }

    char err[160];
    ds4_think_mode think_mode = cli_effective_think_mode(&cfg->gen);
    token_printer printer = {
        .engine = engine,
        .fp = stdout,
        .format_thinking = ds4_think_mode_enabled(think_mode),
        .in_think = ds4_think_mode_enabled(think_mode),
        .use_color = isatty(fileno(stdout)) != 0,
        .last_output_newline = true,
    };
    cli_prefill_progress progress = {
        .base_tokens = 0,
        .input_tokens = prompt->len,
        .use_color = ds4_log_is_tty(stderr),
    };

    const double t_prefill0 = cli_now_sec();
    ds4_session_set_progress(session, cli_prefill_progress_cb, &progress);
    if (ds4_session_sync(session, prompt, err, sizeof(err)) != 0) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
ding, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}

static void token_printer_finish(token_printer *p) {
    if (p->format_thinking) {
        token_printer_process(p, NULL, 0, true);
        token_printer_reset_color(p);
    }
    fflush(p->fp);
}

static void generation_done(void *ud) {
    token_printer *p = ud;
    token_printer_finish(p);
    if (!p->last_output_newline) {
        fputc('\n', p->fp);
        p->last_output_newline = true;
    }
    fflush(p->fp);
}

static void token_printer_write_text(token_printer *p, const char *text, size_t len) {
    if (p->format_thinking) {
        token_printer_process(p, text, len, false);
    } else if (len) {
        fwrite(text, 1, len, p->fp);
        p->last_output_newline = text[len - 1] == '\n';
    }
}

static void print_generated_token(void *ud, int token) {
    token_printer *p = ud;
    size_t len = 0;
    char *text = ds4_token_text(p->engine, token, &len);
    token_printer_write_text(p, text, len);
    fflush(p->fp);
    free(text);
}

static void build_prompt(ds4_engine *engine, const cli_generation_options *gen, ds4_tokens *out) {
    if (is_rendered_chat_prompt(gen->prompt)) {
        ds4_tokenize_rendered_chat(engine, gen->prompt, out);
    } else {
        ds4_encode_chat_prompt(engine, gen->system, gen->prompt,
                               cli_effective_think_mode(gen), out);
    }
}

static int run_sampled_generation(ds4_engine *engine, const cli_config *cfg, const ds4_tokens *prompt) {
    ds4_session *session = NULL;
    if (ds4_session_create(&session, engine, cfg->gen.ctx_size) != 0) {
        fprintf(stderr, "ds4: sampled CLI generation requires a session backend\n");
        return 1;
    }

    char err[160];
    ds4_think_mode think_mode = cli_effective_think_mode(&cfg->gen);
    token_printer printer = {
        .engine = engine,
        .fp = stdout,
        .format_thinking = ds4_think_mode_enabled(think_mode),
        .in_think = ds4_think_mode_enabled(think_mode),
        .use_color = isatty(fileno(stdout)) != 0,
        .last_output_newline = true,
    };
    cli_prefill_progress progress = {
        .base_tokens = 0,
        .input_tokens = prompt->len,
        .use_color = ds4_log_is_tty(stderr),
    };

    const double t_prefill0 = cli_now_sec();
    ds4_session_set_progress(session, cli_prefill_progress_cb, &progress);
    if (ds4_session_sync(session, prompt, err, sizeof(err)) != 0) {
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
ding, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}

static void token_printer_finish(token_printer *p) {
    if (p->format_thinking) {
        token_printer_process(p, NULL, 0, true);
        token_printer_reset_color(p);
    }
    fflush(p->fp);
}

static void generation_done(void *ud) {
    token_printer *p = ud;
    token_printer_finish(p);
    if (!p->last_output_newline) {
        fputc('\n', p->fp);
        p->last_output_newline = true;
    }
    fflush(p->fp);
}

static void token_printer_write_text(token_printer *p, const char *text, size_t len) {
    if (p->format_thinking) {
        token_printer_process(p, text, len, false);
    } else if (len) {
        fwrite(text, 1, len, p->fp);
        p->last_output_newline = text[len - 1] == '\n';
    }
}

static void print_generated_token(void *ud, int token) {
    token_printer *p = ud;
    size_t len = 0;
    char *text = ds4_token_text(p->engine, token, &len);
    token_printer_write_text(p, text, len);
    fflush(p->fp);
    free(text);
}

static void build_prompt(ds4_engine *engine, const cli_generation_options *gen, ds4_tokens *out) {
    if (is_rendered_chat_prompt(gen->prompt)) {
        ds4_tokenize_rendered_chat(engine, gen->prompt, out);
    } else {
        ds4_encode_chat_prompt(engine, gen->system, gen->prompt,
                               cli_effective_think_mode(gen), out);
    }
}

static int run_sampled_generation(ds4_engine *engine, const cli_config *cfg, const ds4_tokens *prompt) {
    ds4_session *session = NULL;
    if (ds4_session_create(&session, engine, cfg->gen.ctx_size) != 0) {
        fprintf(stderr, "ds4: sampled CLI generation requires a session backend\n");
        return 1;
    }

    char err[160];
    ds4_think_mode think_mode = cli_effective_think_mode(&cfg->gen);
    token_printer printer = {
        .engine = engine,
        .fp = stdout,
        .format_thinking = ds4_think_mode_enabled(think_mode),
        .in_think = ds4_think_mode_enabled(think_mode),
        .use_color = isatty(fileno(stdout)) != 0,
        .last_output_newline = true,
    };
    cli_prefill_progress progress = {
        .base_tokens = 0,
        .input_tokens = prompt->len,
        .use_color = ds4_log_is_tty(stderr),
    };

    const double t_prefill0 = cli_now_sec();
    ds4_session_set_progress(session, cli_prefill_progress_cb, &progress);
    if (ds4_session_sync(session, prompt, err, sizeof(err)) != 0) {
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_cli.c

```c
ding, cur, rem);
                p->pending_len = rem;
            }
            break;
        }
        token_printer_write_char(p, cur[0]);
        i++;
    }

    free(buf);
}

static void token_printer_finish(token_printer *p) {
    if (p->format_thinking) {
        token_printer_process(p, NULL, 0, true);
        token_printer_reset_color(p);
    }
    fflush(p->fp);
}

static void generation_done(void *ud) {
    token_printer *p = ud;
    token_printer_finish(p);
    if (!p->last_output_newline) {
        fputc('\n', p->fp);
        p->last_output_newline = true;
    }
    fflush(p->fp);
}

static void token_printer_write_text(token_printer *p, const char *text, size_t len) {
    if (p->format_thinking) {
        token_printer_process(p, text, len, false);
    } else if (len) {
        fwrite(text, 1, len, p->fp);
        p->last_output_newline = text[len - 1] == '\n';
    }
}

static void print_generated_token(void *ud, int token) {
    token_printer *p = ud;
    size_t len = 0;
    char *text = ds4_token_text(p->engine, token, &len);
    token_printer_write_text(p, text, len);
    fflush(p->fp);
    free(text);
}

static void build_prompt(ds4_engine *engine, const cli_generation_options *gen, ds4_tokens *out) {
    if (is_rendered_chat_prompt(gen->prompt)) {
        ds4_tokenize_rendered_chat(engine, gen->prompt, out);
    } else {
        ds4_encode_chat_prompt(engine, gen->system, gen->prompt,
                               cli_effective_think_mode(gen), out);
    }
}

static int run_sampled_generation(ds4_engine *engine, const cli_config *cfg, const ds4_tokens *prompt) {
    ds4_session *session = NULL;
    if (ds4_session_create(&session, engine, cfg->gen.ctx_size) != 0) {
        fprintf(stderr, "ds4: sampled CLI generation requires a session backend\n");
        return 1;
    }

    char err[160];
    ds4_think_mode think_mode = cli_effective_think_mode(&cfg->gen);
    token_printer printer = {
        .engine = engine,
        .fp = stdout,
        .format_thinking = ds4_think_mode_enabled(think_mode),
        .in_think = ds4_think_mode_enabled(think_mode),
        .use_color = isatty(fileno(stdout)) != 0,
        .last_output_newline = true,
    };
    cli_prefill_progress progress = {
        .base_tokens = 0,
        .input_tokens = prompt->len,
        .use_color = ds4_log_is_tty(stderr),
    };

    const double t_prefill0 = cli_now_sec();
    ds4_session_set_progress(session, cli_prefill_progress_cb, &progress);
    if (ds4_session_sync(session, prompt, err, sizeof(err)) != 0) {
```<｜Assistant｜><think>