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1 | /* -*-c-*- |
2 | * |
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3 | * Memory allocation functions |
4 | * |
5 | * (c) 1998 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
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13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
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23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
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26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | /* --- ANSI headers --- */ |
31 | |
32 | #include <stdio.h> |
33 | #include <stdlib.h> |
34 | #include <string.h> |
35 | |
36 | /* --- Local headers --- */ |
37 | |
38 | #include "alloc.h" |
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39 | #include "arena.h" |
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40 | #include "exc.h" |
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41 | |
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42 | /*----- Functions and macros ----------------------------------------------*/ |
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43 | |
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44 | /* --- @x_alloc@ --- * |
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45 | * |
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46 | * Arguments: @arena *a@ = pointer to underlying arena |
47 | * @size_t sz@ = size of block to allocate |
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48 | * |
49 | * Returns: Pointer to allocated block. |
50 | * |
51 | * Use: Allocates memory. If there's not enough memory, the |
52 | * exception @EXC_NOMEM@ is thrown. |
53 | */ |
54 | |
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55 | void *x_alloc(arena *a, size_t sz) |
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56 | { |
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57 | void *p = A_ALLOC(a, sz); |
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58 | if (!p) |
59 | THROW(EXC_NOMEM); |
60 | return (p); |
61 | } |
62 | |
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63 | /* --- @x_strdup@ --- * |
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64 | * |
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65 | * Arguments: @arena *a@ = pointer to underlying arena |
66 | * @const char *s@ = pointer to a string |
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67 | * |
68 | * Returns: Pointer to a copy of the string. |
69 | * |
70 | * Use: Copies a string (like @strdup@ would, if it existed). If |
71 | * there's not enough memory, the exception @EXC_NOMEM@ is |
72 | * thrown. |
73 | */ |
74 | |
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75 | char *x_strdup(arena *a, const char *s) |
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76 | { |
77 | size_t sz = strlen(s) + 1; |
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78 | char *p = x_alloc(a, sz); |
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79 | memcpy(p, s, sz); |
80 | return (p); |
81 | } |
82 | |
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83 | /* --- @x_realloc@ --- * |
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84 | * |
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85 | * Arguments: @arena *a@ = pointer to underlying arena |
86 | * @void *p@ = pointer to a block of memory |
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87 | * @size_t sz@ = new size desired for the block |
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88 | * @size_t osz@ = size of the old block |
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89 | * |
90 | * Returns: Pointer to the resized memory block (which is almost |
91 | * certainly not in the same place any more). |
92 | * |
93 | * Use: Resizes a memory block. If there's not enough memory, the |
94 | * exception @EXC_NOMEM@ is thrown. |
95 | */ |
96 | |
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97 | void *x_realloc(arena *a, void *p, size_t sz, size_t osz) |
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98 | { |
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99 | p = A_REALLOC(a, p, sz, osz); |
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100 | if (!p) |
101 | THROW(EXC_NOMEM); |
102 | return (p); |
103 | } |
104 | |
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105 | /* --- @x_free@ --- * |
106 | * |
107 | * Arguments: @arena *a@ = pointer to underlying arena |
108 | * @void *p@ = pointer to a block of memory. |
109 | * |
110 | * Returns: --- |
111 | * |
112 | * Use: Frees a block of memory. |
113 | */ |
114 | |
115 | void (x_free)(arena *a, void *p) { x_free(a, p); } |
116 | |
117 | /*----- Old functions for the standard arena ------------------------------*/ |
118 | |
119 | /* --- @xmalloc@ --- * |
120 | * |
121 | * Arguments: @size_t sz@ = size of block to allocate |
122 | * |
123 | * Returns: Pointer to allocated block. |
124 | * |
125 | * Use: Allocates memory. If there's not enough memory, the |
126 | * exception @EXC_NOMEM@ is thrown. |
127 | */ |
128 | |
129 | void *(xmalloc)(size_t sz) { return xmalloc(sz); } |
130 | |
131 | /* --- @xstrdup@ --- * |
132 | * |
133 | * Arguments: @const char *s@ = pointer to a string |
134 | * |
135 | * Returns: Pointer to a copy of the string. |
136 | * |
137 | * Use: Copies a string (like @strdup@ would, if it existed). If |
138 | * there's not enough memory, the exception @EXC_NOMEM@ is |
139 | * thrown. |
140 | */ |
141 | |
142 | char *(xstrdup)(const char *s) { return xstrdup(s); } |
143 | |
144 | /* --- @xrealloc@ --- * |
145 | * |
146 | * Arguments: @void *p@ = pointer to a block of memory |
147 | * @size_t sz@ = new size desired for the block |
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148 | * @size_t osz@ = size of the old block |
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149 | * |
150 | * Returns: Pointer to the resized memory block (which is almost |
151 | * certainly not in the same place any more). |
152 | * |
153 | * Use: Resizes a memory block. If there's not enough memory, the |
154 | * exception @EXC_NOMEM@ is thrown. |
155 | */ |
156 | |
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157 | void *(xrealloc)(void *p, size_t sz, size_t osz) |
158 | { return xrealloc(p, sz, osz); } |
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159 | |
160 | /* --- @xfree@ --- * |
161 | * |
162 | * Arguments: @void *p@ = pointer to a block of memory. |
163 | * |
164 | * Returns: --- |
165 | * |
166 | * Use: Frees a block of memory. |
167 | */ |
168 | |
169 | void (xfree)(void *p) { xfree(p); } |
170 | |
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171 | /*----- That's all, folks -------------------------------------------------*/ |