Method init_fp

subprojects/llama.cpp/src/llama-mmap.cpp:202–210

#endif

    void init_fp(const char * mode) {
        fp = ggml_fopen(fname.c_str(), mode);
        if (fp == NULL) {
            throw std::runtime_error(format("failed to open %s: %s", fname.c_str(), strerror(errno)));
        }
        seek(0, SEEK_END);
        size = tell();
        seek(0, SEEK_SET);
    }

    size_t tell() const {
        if (fd == -1) {