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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: alloc.c,v 1.5 2000/07/16 12:29:16 mdw Exp $ |
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4 | * |
5 | * Memory allocation functions |
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: alloc.c,v $ |
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33 | * Revision 1.5 2000/07/16 12:29:16 mdw |
34 | * Change to arena `realloc' interface, to fix a design bug. |
35 | * |
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36 | * Revision 1.4 2000/06/17 10:35:51 mdw |
37 | * Major overhaul for arena support. |
38 | * |
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39 | * Revision 1.3 1999/05/06 19:51:35 mdw |
40 | * Reformatted the LGPL notice a little bit. |
41 | * |
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42 | * Revision 1.2 1999/05/05 18:50:31 mdw |
43 | * Change licensing conditions to LGPL. |
44 | * |
45 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
46 | * Initial version of mLib |
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47 | * |
48 | */ |
49 | |
50 | /*----- Header files ------------------------------------------------------*/ |
51 | |
52 | /* --- ANSI headers --- */ |
53 | |
54 | #include <stdio.h> |
55 | #include <stdlib.h> |
56 | #include <string.h> |
57 | |
58 | /* --- Local headers --- */ |
59 | |
60 | #include "alloc.h" |
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61 | #include "arena.h" |
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62 | #include "exc.h" |
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63 | |
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64 | /*----- Functions and macros ----------------------------------------------*/ |
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65 | |
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66 | /* --- @x_alloc@ --- * |
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67 | * |
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68 | * Arguments: @arena *a@ = pointer to underlying arena |
69 | * @size_t sz@ = size of block to allocate |
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70 | * |
71 | * Returns: Pointer to allocated block. |
72 | * |
73 | * Use: Allocates memory. If there's not enough memory, the |
74 | * exception @EXC_NOMEM@ is thrown. |
75 | */ |
76 | |
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77 | void *x_alloc(arena *a, size_t sz) |
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78 | { |
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79 | void *p = A_ALLOC(a, sz); |
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80 | if (!p) |
81 | THROW(EXC_NOMEM); |
82 | return (p); |
83 | } |
84 | |
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85 | /* --- @x_strdup@ --- * |
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86 | * |
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87 | * Arguments: @arena *a@ = pointer to underlying arena |
88 | * @const char *s@ = pointer to a string |
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89 | * |
90 | * Returns: Pointer to a copy of the string. |
91 | * |
92 | * Use: Copies a string (like @strdup@ would, if it existed). If |
93 | * there's not enough memory, the exception @EXC_NOMEM@ is |
94 | * thrown. |
95 | */ |
96 | |
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97 | char *x_strdup(arena *a, const char *s) |
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98 | { |
99 | size_t sz = strlen(s) + 1; |
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100 | char *p = x_alloc(a, sz); |
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101 | memcpy(p, s, sz); |
102 | return (p); |
103 | } |
104 | |
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105 | /* --- @x_realloc@ --- * |
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106 | * |
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107 | * Arguments: @arena *a@ = pointer to underlying arena |
108 | * @void *p@ = pointer to a block of memory |
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109 | * @size_t sz@ = new size desired for the block |
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110 | * @size_t osz@ = size of the old block |
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111 | * |
112 | * Returns: Pointer to the resized memory block (which is almost |
113 | * certainly not in the same place any more). |
114 | * |
115 | * Use: Resizes a memory block. If there's not enough memory, the |
116 | * exception @EXC_NOMEM@ is thrown. |
117 | */ |
118 | |
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119 | void *x_realloc(arena *a, void *p, size_t sz, size_t osz) |
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120 | { |
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121 | p = A_REALLOC(a, p, sz, osz); |
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122 | if (!p) |
123 | THROW(EXC_NOMEM); |
124 | return (p); |
125 | } |
126 | |
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127 | /* --- @x_free@ --- * |
128 | * |
129 | * Arguments: @arena *a@ = pointer to underlying arena |
130 | * @void *p@ = pointer to a block of memory. |
131 | * |
132 | * Returns: --- |
133 | * |
134 | * Use: Frees a block of memory. |
135 | */ |
136 | |
137 | void (x_free)(arena *a, void *p) { x_free(a, p); } |
138 | |
139 | /*----- Old functions for the standard arena ------------------------------*/ |
140 | |
141 | /* --- @xmalloc@ --- * |
142 | * |
143 | * Arguments: @size_t sz@ = size of block to allocate |
144 | * |
145 | * Returns: Pointer to allocated block. |
146 | * |
147 | * Use: Allocates memory. If there's not enough memory, the |
148 | * exception @EXC_NOMEM@ is thrown. |
149 | */ |
150 | |
151 | void *(xmalloc)(size_t sz) { return xmalloc(sz); } |
152 | |
153 | /* --- @xstrdup@ --- * |
154 | * |
155 | * Arguments: @const char *s@ = pointer to a string |
156 | * |
157 | * Returns: Pointer to a copy of the string. |
158 | * |
159 | * Use: Copies a string (like @strdup@ would, if it existed). If |
160 | * there's not enough memory, the exception @EXC_NOMEM@ is |
161 | * thrown. |
162 | */ |
163 | |
164 | char *(xstrdup)(const char *s) { return xstrdup(s); } |
165 | |
166 | /* --- @xrealloc@ --- * |
167 | * |
168 | * Arguments: @void *p@ = pointer to a block of memory |
169 | * @size_t sz@ = new size desired for the block |
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170 | * @size_t osz@ = size of the old block |
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171 | * |
172 | * Returns: Pointer to the resized memory block (which is almost |
173 | * certainly not in the same place any more). |
174 | * |
175 | * Use: Resizes a memory block. If there's not enough memory, the |
176 | * exception @EXC_NOMEM@ is thrown. |
177 | */ |
178 | |
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179 | void *(xrealloc)(void *p, size_t sz, size_t osz) |
180 | { return xrealloc(p, sz, osz); } |
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181 | |
182 | /* --- @xfree@ --- * |
183 | * |
184 | * Arguments: @void *p@ = pointer to a block of memory. |
185 | * |
186 | * Returns: --- |
187 | * |
188 | * Use: Frees a block of memory. |
189 | */ |
190 | |
191 | void (xfree)(void *p) { xfree(p); } |
192 | |
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193 | /*----- That's all, folks -------------------------------------------------*/ |