dmd2/lstring.h

   1
   2 // lstring.h
   3 // length-prefixed strings
   4
   5 // Copyright (c) 1999-2002 by Digital Mars
   6 // All Rights Reserved
   7 // written by Walter Bright
   8 // www.digitalmars.com
   9 // License for redistribution is by either the Artistic License
  10 // in artistic.txt, or the GNU General Public License in gnu.txt.
  11 // See the included readme.txt for details.
  12
  13 #ifndef LSTRING_H
  14 #define LSTRING_H 1
  15
  16 #include "dchar.h"
  17
  18 struct Lstring
  19 {
  20     unsigned length;
  21
  22     // Disable warning about nonstandard extension
  23     #pragma warning (disable : 4200)
  24     dchar string[];
  25
  26     static Lstring zero;        // 0 length string
  27
  28     // No constructors because we want to be able to statically
  29     // initialize Lstring's, and Lstrings are of variable size.
  30
  31     #if M_UNICODE
  32     #define LSTRING(p,length) { length, L##p }
  33     #else
  34     #define LSTRING(p,length) { length, p }
  35     #endif
  36
  37 #if __GNUC__
  38     #define LSTRING_EMPTY() { 0 }
  39 #else
  40     #define LSTRING_EMPTY() LSTRING("", 0)
  41 #endif
  42
  43     static Lstring *ctor(const dchar *p) { return ctor(p, Dchar::len(p)); }
  44     static Lstring *ctor(const dchar *p, unsigned length);
  45     static unsigned size(unsigned length) { return sizeof(Lstring) + (length + 1) * sizeof(dchar); }
  46     static Lstring *alloc(unsigned length);
  47     Lstring *clone();
  48
  49     unsigned len() { return length; }
  50
  51     dchar *toDchars() { return string; }
  52
  53     hash_t hash() { return Dchar::calcHash(string, length); }
  54     hash_t ihash() { return Dchar::icalcHash(string, length); }
  55
  56     static int cmp(const Lstring *s1, const Lstring *s2)
  57     {
  58         int c = s2->length - s1->length;
  59         return c ? c : Dchar::memcmp(s1->string, s2->string, s1->length);
  60     }
  61
  62     static int icmp(const Lstring *s1, const Lstring *s2)
  63     {
  64         int c = s2->length - s1->length;
  65         return c ? c : Dchar::memicmp(s1->string, s2->string, s1->length);
  66     }
  67
  68     Lstring *append(const Lstring *s);
  69     Lstring *substring(int start, int end);
  70 };
  71
  72 #endif