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