Function text_stream_safe_limit

ds4_server.c:7392–7431

static const dsml_syntax qwen_tool_syntax = {
    "<tool_call>", "</tool_call>",
    "<function=", "</function>", "<parameter=", "</parameter>",
};

typedef struct {
    dsml_track_mode mode;
    dsml_decode_state decode;
    const dsml_syntax *syn;
    size_t pos;
    bool json_in_string;
    bool json_escaped;
    server_model_syntax model_syntax;
} dsml_decode_tracker;

static size_t dsml_max_tool_start_len(void) {
    size_t max = 0;
    for (size_t i = 0; i < sizeof(dsml_syntaxes) / sizeof(dsml_syntaxes[0]); i++) {
        size_t n = strlen(dsml_syntaxes[i].tool_calls_start);
        if (n > max) max = n;
    }
    return max;
}

static bool dsml_find_tool_start(const char *raw, size_t raw_len,
                                 size_t *pos_out,
                                 const dsml_syntax **syn_out) {
    const char *best = NULL;
    const dsml_syntax *best_syn = NULL;
    for (size_t i = 0; i < sizeof(dsml_syntaxes) / sizeof(dsml_syntaxes[0]); i++) {
        const char *p = find_lit_bounded(raw, raw_len, dsml_syntaxes[i].tool_calls_start);
        if (p && (!best || p < best)) {
            best = p;
            best_syn = &dsml_syntaxes[i];
        }
    }
    if (!best) return false;
    *pos_out = (size_t)(best - raw) + strlen(best_syn->tool_calls_start);
    *syn_out = best_syn;
    return true;
}

static bool dsml_find_tool_start_from(const char *raw, size_t raw_len,
                                      size_t start,