flower/string-data.hh

   1 /*
   2   string-data.hh -- declare  String_data
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9
  10 #ifndef STRINGDATA_HH
  11 #define STRINGDATA_HH
  12
  13
  14 /**Internal String struct.
  15    the data itself. Handles simple tasks (resizing, resetting)
  16    */
  17 class String_data {
  18     // GNU malloc: storage overhead is 8 bytes anyway.
  19
  20 friend class String_handle;
  21     int maxlen; // maxlen is arraysize-1
  22
  23     int length_i_;
  24     Byte* data_byte_p_;
  25     int references;
  26
  27     /// init to ""
  28     String_data();
  29
  30     /// init from src. Conservative allocation.
  31     String_data(String_data const &src);
  32
  33     ~String_data();
  34
  35     /** POST: maxlen >= j.
  36       @param j, maximum stringlength_i_.
  37       contents thrown away.
  38     */
  39     void setmax(int j);
  40
  41     /** POST: maxlen >= j.
  42       @param j, maximum stringlength_i_.
  43       contents are kept if it grows.
  44       */
  45     void remax(int j);
  46
  47     /// check if writeable.
  48     void OKW();
  49
  50     /// check state.
  51     void OK();
  52
  53     /// reduce memory usage.
  54     void tighten();
  55
  56     // assignment.
  57     void set( Byte const* byte_c_l, int length_i );
  58
  59     void set( char const* ch_c_l );
  60
  61     /// concatenation.
  62     void append( Byte const* byte_c_l, int length_i );
  63
  64     void operator += ( char const* ch_c_l );
  65
  66     char const* ch_c_l() const;
  67
  68     char* ch_l();
  69
  70     Byte const* byte_c_l() const;
  71
  72     // idem, non const
  73     Byte* byte_l();
  74
  75     void trunc(int j);
  76
  77     /** access element. not really safe. Can alter length_i_ without
  78       #String_data# knowing it.  */
  79     Byte &operator [](int j);
  80     Byte operator [](int j) const;
  81     bool null_terminated_b()const;
  82 };
  83
  84
  85
  86 #ifdef STRING_UTILS_INLINED
  87 #ifndef INLINE
  88 #define INLINE inline
  89 #endif
  90 #include "string-data.inl"
  91
  92 #endif
  93
  94
  95 #endif // STRING_DATA_HH