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Make much more usage of dynamic strings (StrBufs) instead of char* and
[cc65] / src / common / strpool.h
1 /*****************************************************************************/
2 /*                                                                           */
3 /*                                 strpool.h                                 */
4 /*                                                                           */
5 /*                               A string pool                               */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 2003-2008 Ullrich von Bassewitz                                       */
10 /*               Roemerstrasse 52                                            */
11 /*               D-70794 Filderstadt                                         */
12 /* EMail:        uz@cc65.org                                                 */
13 /*                                                                           */
14 /*                                                                           */
15 /* This software is provided 'as-is', without any expressed or implied       */
16 /* warranty.  In no event will the authors be held liable for any damages    */
17 /* arising from the use of this software.                                    */
18 /*                                                                           */
19 /* Permission is granted to anyone to use this software for any purpose,     */
20 /* including commercial applications, and to alter it and redistribute it    */
21 /* freely, subject to the following restrictions:                            */
22 /*                                                                           */
23 /* 1. The origin of this software must not be misrepresented; you must not   */
24 /*    claim that you wrote the original software. If you use this software   */
25 /*    in a product, an acknowledgment in the product documentation would be  */
26 /*    appreciated but is not required.                                       */
27 /* 2. Altered source versions must be plainly marked as such, and must not   */
28 /*    be misrepresented as being the original software.                      */
29 /* 3. This notice may not be removed or altered from any source              */
30 /*    distribution.                                                          */
31 /*                                                                           */
32 /*****************************************************************************/
33
34
35
36 /* A string pool is used to store identifiers and other strings. Each string
37  * stored in the pool has a unique id, which may be used to access the string
38  * in the pool. Identical strings are only stored once in the pool and have
39  * identical ids. This means that instead of comparing strings, just the
40  * string pool ids must be compared.
41  */
42
43
44
45 #ifndef STRPOOL_H
46 #define STRPOOL_H
47
48
49
50 /* common */
51 #include "attrib.h"
52 #include "coll.h"
53 #include "inline.h"
54 #include "strbuf.h"
55
56
57
58 /*****************************************************************************/
59 /*                                     Data                                  */
60 /*****************************************************************************/
61
62
63
64 /* Opaque string pool entry */
65 typedef struct StringPoolEntry StringPoolEntry;
66
67 /* A string pool */
68 typedef struct StringPool StringPool;
69 struct StringPool {
70     Collection        Entries;    /* Entries sorted by number */
71     unsigned          TotalSize;  /* Total size of all string data */
72     StringPoolEntry*  Tab[4177];  /* Entry hash table */
73 };
74
75 /* A string pool initializer. We do only initialize the first field, all
76  * others will get zeroed out by the compiler.
77  */
78 #define STATIC_STRINGPOOL_INITIALIZER {         \
79     STATIC_COLLECTION_INITIALIZER,              \
80     0,                                          \
81     { 0 }                                       \
82 }
83
84
85
86 /*****************************************************************************/
87 /*                                     Code                                  */
88 /*****************************************************************************/
89
90
91
92 StringPool* InitStringPool (StringPool* P);
93 /* Initialize a string pool */
94
95 void DoneStringPool (StringPool* P);
96 /* Free the data of a string pool (but not the data itself) */
97
98 StringPool* NewStringPool (void);
99 /* Allocate, initialize and return a new string pool */
100
101 void FreeStringPool (StringPool* P);
102 /* Free a string pool */
103
104 const StrBuf* SP_Get (const StringPool* P, unsigned Index);
105 /* Return a string from the pool. Index must exist, otherwise FAIL is called. */
106
107 unsigned SP_Add (StringPool* P, const StrBuf* S);
108 /* Add a string buffer to the buffer and return the index. If the string does
109  * already exist in the pool, SP_AddBuf will just return the index of the
110  * existing string.
111  */
112
113 unsigned SP_AddStr (StringPool* P, const char* S);
114 /* Add a string to the buffer and return the index. If the string does already
115  * exist in the pool, SP_Add will just return the index of the existing string.
116  */
117
118 #if defined(HAVE_INLINE)
119 INLINE unsigned SP_GetCount (const StringPool* P)
120 /* Return the number of strings in the pool */
121 {
122     return CollCount (&P->Entries);
123 }
124 #else
125 #  define SP_GetCount(P)        CollCount (&(P)->Entries)
126 #endif
127
128
129
130 /* End of strpool.h */
131
132 #endif
133
134
135