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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: alloc.c,v 1.6 2004/04/08 01:36:11 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. |
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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. |
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23 | * |
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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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | /* --- ANSI headers --- */ |
33 | |
34 | #include <stdio.h> |
35 | #include <stdlib.h> |
36 | #include <string.h> |
37 | |
38 | /* --- Local headers --- */ |
39 | |
40 | #include "alloc.h" |
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41 | #include "arena.h" |
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42 | #include "exc.h" |
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43 | |
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44 | /*----- Functions and macros ----------------------------------------------*/ |
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45 | |
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46 | /* --- @x_alloc@ --- * |
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47 | * |
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48 | * Arguments: @arena *a@ = pointer to underlying arena |
49 | * @size_t sz@ = size of block to allocate |
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50 | * |
51 | * Returns: Pointer to allocated block. |
52 | * |
53 | * Use: Allocates memory. If there's not enough memory, the |
54 | * exception @EXC_NOMEM@ is thrown. |
55 | */ |
56 | |
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57 | void *x_alloc(arena *a, size_t sz) |
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58 | { |
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59 | void *p = A_ALLOC(a, sz); |
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60 | if (!p) |
61 | THROW(EXC_NOMEM); |
62 | return (p); |
63 | } |
64 | |
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65 | /* --- @x_strdup@ --- * |
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66 | * |
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67 | * Arguments: @arena *a@ = pointer to underlying arena |
68 | * @const char *s@ = pointer to a string |
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69 | * |
70 | * Returns: Pointer to a copy of the string. |
71 | * |
72 | * Use: Copies a string (like @strdup@ would, if it existed). If |
73 | * there's not enough memory, the exception @EXC_NOMEM@ is |
74 | * thrown. |
75 | */ |
76 | |
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77 | char *x_strdup(arena *a, const char *s) |
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78 | { |
79 | size_t sz = strlen(s) + 1; |
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80 | char *p = x_alloc(a, sz); |
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81 | memcpy(p, s, sz); |
82 | return (p); |
83 | } |
84 | |
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85 | /* --- @x_realloc@ --- * |
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86 | * |
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87 | * Arguments: @arena *a@ = pointer to underlying arena |
88 | * @void *p@ = pointer to a block of memory |
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89 | * @size_t sz@ = new size desired for the block |
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90 | * @size_t osz@ = size of the old block |
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91 | * |
92 | * Returns: Pointer to the resized memory block (which is almost |
93 | * certainly not in the same place any more). |
94 | * |
95 | * Use: Resizes a memory block. If there's not enough memory, the |
96 | * exception @EXC_NOMEM@ is thrown. |
97 | */ |
98 | |
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99 | void *x_realloc(arena *a, void *p, size_t sz, size_t osz) |
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100 | { |
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101 | p = A_REALLOC(a, p, sz, osz); |
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102 | if (!p) |
103 | THROW(EXC_NOMEM); |
104 | return (p); |
105 | } |
106 | |
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107 | /* --- @x_free@ --- * |
108 | * |
109 | * Arguments: @arena *a@ = pointer to underlying arena |
110 | * @void *p@ = pointer to a block of memory. |
111 | * |
112 | * Returns: --- |
113 | * |
114 | * Use: Frees a block of memory. |
115 | */ |
116 | |
117 | void (x_free)(arena *a, void *p) { x_free(a, p); } |
118 | |
119 | /*----- Old functions for the standard arena ------------------------------*/ |
120 | |
121 | /* --- @xmalloc@ --- * |
122 | * |
123 | * Arguments: @size_t sz@ = size of block to allocate |
124 | * |
125 | * Returns: Pointer to allocated block. |
126 | * |
127 | * Use: Allocates memory. If there's not enough memory, the |
128 | * exception @EXC_NOMEM@ is thrown. |
129 | */ |
130 | |
131 | void *(xmalloc)(size_t sz) { return xmalloc(sz); } |
132 | |
133 | /* --- @xstrdup@ --- * |
134 | * |
135 | * Arguments: @const char *s@ = pointer to a string |
136 | * |
137 | * Returns: Pointer to a copy of the string. |
138 | * |
139 | * Use: Copies a string (like @strdup@ would, if it existed). If |
140 | * there's not enough memory, the exception @EXC_NOMEM@ is |
141 | * thrown. |
142 | */ |
143 | |
144 | char *(xstrdup)(const char *s) { return xstrdup(s); } |
145 | |
146 | /* --- @xrealloc@ --- * |
147 | * |
148 | * Arguments: @void *p@ = pointer to a block of memory |
149 | * @size_t sz@ = new size desired for the block |
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150 | * @size_t osz@ = size of the old block |
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151 | * |
152 | * Returns: Pointer to the resized memory block (which is almost |
153 | * certainly not in the same place any more). |
154 | * |
155 | * Use: Resizes a memory block. If there's not enough memory, the |
156 | * exception @EXC_NOMEM@ is thrown. |
157 | */ |
158 | |
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159 | void *(xrealloc)(void *p, size_t sz, size_t osz) |
160 | { return xrealloc(p, sz, osz); } |
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161 | |
162 | /* --- @xfree@ --- * |
163 | * |
164 | * Arguments: @void *p@ = pointer to a block of memory. |
165 | * |
166 | * Returns: --- |
167 | * |
168 | * Use: Frees a block of memory. |
169 | */ |
170 | |
171 | void (xfree)(void *p) { xfree(p); } |
172 | |
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173 | /*----- That's all, folks -------------------------------------------------*/ |