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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: sym.h,v 1.10 1999/12/10 23:42:04 mdw Exp $ |
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4 | * |
5 | * Symbol table management |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of the mLib utilities library. |
13 | * |
14 | * mLib is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
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19 | * mLib is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
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25 | * License along with mLib; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
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28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: sym.h,v $ |
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33 | * Revision 1.10 1999/12/10 23:42:04 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.9 1999/08/02 16:53:48 mdw |
37 | * Improve type safety for sym_iter objects. |
38 | * |
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39 | * Revision 1.8 1999/08/02 14:45:48 mdw |
40 | * Break low-level hashtable code out from sym. |
41 | * |
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42 | * Revision 1.7 1999/06/01 09:49:33 mdw |
43 | * Allow things to be looked up by just their caller-supplied hashes. This |
44 | * actually needs to be thought through better. |
45 | * |
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46 | * Revision 1.6 1999/05/26 21:08:31 mdw |
47 | * Rename symbols in line with newer conventions. |
48 | * |
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49 | * Revision 1.5 1999/05/13 22:48:37 mdw |
50 | * Change `-ise' to `-ize' throughout. |
51 | * |
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52 | * Revision 1.4 1999/05/06 19:51:35 mdw |
53 | * Reformatted the LGPL notice a little bit. |
54 | * |
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55 | * Revision 1.3 1999/05/05 18:50:31 mdw |
56 | * Change licensing conditions to LGPL. |
57 | * |
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58 | * Revision 1.2 1998/11/26 19:27:34 mdw |
59 | * Move SYM_NAME into the header file. Fix bugs. |
60 | * |
61 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
62 | * Initial version of mLib |
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63 | * |
64 | */ |
65 | |
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66 | #ifndef MLIB_SYM_H |
67 | #define MLIB_SYM_H |
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68 | |
69 | #ifdef __cplusplus |
70 | extern "C" { |
71 | #endif |
72 | |
73 | /*----- Required headers --------------------------------------------------*/ |
74 | |
75 | #include <stddef.h> |
76 | |
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77 | #ifndef MLIB_BITS_H |
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78 | # include "bits.h" |
79 | #endif |
80 | |
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81 | #ifndef MLIB_HASH_H |
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82 | # include "hash.h" |
83 | #endif |
84 | |
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85 | /*----- Type definitions --------------------------------------------------*/ |
86 | |
87 | /* --- Symbol table --- * |
88 | * |
89 | * A @sym_table@ contains the information needed to manage a symbol table. |
90 | * Users shouldn't fiddle with this information directly, but it needs to be |
91 | * here so that objects of the correct type can be created. |
92 | */ |
93 | |
94 | typedef struct sym_table { |
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95 | hash_table t; |
96 | size_t load; |
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97 | } sym_table; |
98 | |
99 | /* --- A symbol table entry --- * |
100 | * |
101 | * I don't care what actually gets stored in symbol entries because I don't |
102 | * create them: that's the responsibility of my client. All I care about |
103 | * here is that whatever gets passed to me is a structure whose first member |
104 | * is a @sym_base@. The ANSI guarantees about structure layout are |
105 | * sufficient to allow me to manipulate such objects. |
106 | */ |
107 | |
108 | #define SYM_BUFSZ 16 /* Size of local string buffer */ |
109 | |
110 | typedef struct sym_base { |
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111 | hash_base b; |
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112 | union { |
113 | char *p; /* Pointer to name string */ |
114 | char b[SYM_BUFSZ]; /* Buffer containing a short name */ |
115 | } name; /* Name of this symbol */ |
116 | size_t len; /* Length of the symbol's name */ |
117 | } sym_base; |
118 | |
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119 | /* --- A macro to pick a symbol's name out from the mess --- */ |
120 | |
121 | #define SYM_NAME(sy) \ |
122 | (((sym_base *)(sy))->len > SYM_BUFSZ ? \ |
123 | ((sym_base *)(sy))->name.p : \ |
124 | ((sym_base *)(sy))->name.b) |
125 | |
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126 | /* --- An iterator block --- */ |
127 | |
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128 | typedef struct { hash_iter i; } sym_iter; |
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129 | |
130 | /*----- External functions ------------------------------------------------*/ |
131 | |
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132 | /* --- @sym_create@ --- * |
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133 | * |
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134 | * Arguments: @sym_table *t@ = symbol table to initialize |
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135 | * |
136 | * Returns: --- |
137 | * |
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138 | * Use: Initializes the given symbol table. Raises @EXC_NOMEM@ if |
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139 | * there isn't enough memory. |
140 | */ |
141 | |
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142 | extern void sym_create(sym_table */*t*/); |
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143 | |
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144 | /* --- @sym_destroy@ --- * |
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145 | * |
146 | * Arguments: @sym_table *t@ = pointer to symbol table in question |
147 | * |
148 | * Returns: --- |
149 | * |
150 | * Use: Destroys a symbol table, freeing all the memory it used to |
151 | * occupy. |
152 | */ |
153 | |
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154 | extern void sym_destroy(sym_table */*t*/); |
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155 | |
156 | /* --- @sym_find@ --- * |
157 | * |
158 | * Arguments: @sym_table *t@ = pointer to symbol table in question |
159 | * @const char *n@ = pointer to symbol table to look up |
160 | * @long l@ = length of the name string or negative to measure |
161 | * @size_t sz@ = size of desired symbol object, or zero |
162 | * @unsigned *f@ = pointer to a flag, or null. |
163 | * |
164 | * Returns: The address of a @sym_base@ structure, or null if not found |
165 | * and @sz@ is zero. |
166 | * |
167 | * Use: Looks up a symbol in a given symbol table. The name is |
168 | * passed by the address of its first character. The length |
169 | * may be given, in which case the name may contain arbitrary |
170 | * binary data, or it may be given as a negative number, in |
171 | * which case the length of the name is calculated as |
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172 | * @strlen(n) + 1@. |
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173 | * |
174 | * The return value is the address of a pointer to a @sym_base@ |
175 | * block (which may have other things on the end, as above). If |
176 | * the symbol could be found, the return value points to the |
177 | * symbol block. If the symbol wasn't there, then if @sz@ is |
178 | * nonzero, a new symbol is created and its address is returned; |
179 | * otherwise a null pointer is returned. The exception |
180 | * @EXC_NOMEM@ is raised if the block can't be allocated. |
181 | * |
182 | * The value of @*f@ indicates whether a new symbol entry was |
183 | * created: a nonzero value indicates that an old value was |
184 | * found. |
185 | */ |
186 | |
187 | extern void *sym_find(sym_table */*t*/, const char */*n*/, long /*l*/, |
188 | size_t /*sz*/, unsigned */*f*/); |
189 | |
190 | /* --- @sym_remove@ --- * |
191 | * |
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192 | * Arguments: @sym_table *t@ = pointer to a symbol table object |
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193 | * @void *b@ = pointer to symbol table entry |
194 | * |
195 | * Returns: --- |
196 | * |
197 | * Use: Removes the object from the symbol table. The space occupied |
198 | * by the object and its name is freed; anything else attached |
199 | * to the entry should already be gone by this point. |
200 | */ |
201 | |
202 | extern void sym_remove(sym_table */*t*/, void */*b*/); |
203 | |
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204 | /* --- @sym_mkiter@ --- * |
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205 | * |
206 | * Arguments: @sym_iter *i@ = pointer to an iterator object |
207 | * @sym_table *t@ = pointer to a symbol table object |
208 | * |
209 | * Returns: --- |
210 | * |
211 | * Use: Creates a new symbol table iterator which may be used to |
212 | * iterate through a symbol table. |
213 | */ |
214 | |
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215 | #define SYM_MKITER(i_, t_) HASH_MKITER(&(i_)->i, &(t_)->t) |
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216 | |
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217 | extern void sym_mkiter(sym_iter */*i*/, sym_table */*t*/); |
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218 | |
219 | /* --- @sym_next@ --- * |
220 | * |
221 | * Arguments: @sym_iter *i@ = pointer to iterator object |
222 | * |
223 | * Returns: Pointer to the next symbol found, or null when finished. |
224 | * |
225 | * Use: Returns the next symbol from the table. Symbols are not |
226 | * returned in any particular order. |
227 | */ |
228 | |
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229 | #define SYM_NEXT(i_, p) do { \ |
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230 | hash_base *_q; \ |
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231 | HASH_NEXT(&(i_)->i, _q); \ |
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232 | (p) = (void *)_q; \ |
233 | } while (0) |
234 | |
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235 | extern void *sym_next(sym_iter */*i*/); |
236 | |
237 | /*----- That's all, folks -------------------------------------------------*/ |
238 | |
239 | #ifdef __cplusplus |
240 | } |
241 | #endif |
242 | |
243 | #endif |