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ef416fc2 | 1 | /* |
2 | * gmem.c | |
3 | * | |
4 | * Memory routines with out-of-memory checking. | |
5 | * | |
6 | * Copyright 1996-2003 Glyph & Cog, LLC | |
7 | */ | |
8 | ||
9 | #include <config.h> | |
10 | #include <stdio.h> | |
11 | #include <stdlib.h> | |
12 | #include <stddef.h> | |
13 | #include <string.h> | |
bd7854cb | 14 | #include <limits.h> |
ef416fc2 | 15 | #include "gmem.h" |
16 | ||
17 | #ifdef DEBUG_MEM | |
18 | ||
19 | typedef struct _GMemHdr { | |
20 | int size; | |
21 | int index; | |
22 | struct _GMemHdr *next; | |
23 | } GMemHdr; | |
24 | ||
25 | #define gMemHdrSize ((sizeof(GMemHdr) + 7) & ~7) | |
26 | #define gMemTrlSize (sizeof(long)) | |
27 | ||
28 | #if gmemTrlSize==8 | |
29 | #define gMemDeadVal 0xdeadbeefdeadbeefUL | |
30 | #else | |
31 | #define gMemDeadVal 0xdeadbeefUL | |
32 | #endif | |
33 | ||
34 | /* round data size so trailer will be aligned */ | |
35 | #define gMemDataSize(size) \ | |
36 | ((((size) + gMemTrlSize - 1) / gMemTrlSize) * gMemTrlSize) | |
37 | ||
38 | #define gMemNLists 64 | |
39 | #define gMemListShift 4 | |
40 | #define gMemListMask (gMemNLists - 1) | |
41 | static GMemHdr *gMemList[gMemNLists] = { | |
42 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
43 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
44 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
45 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
46 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
47 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
48 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
49 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL | |
50 | }; | |
51 | ||
52 | static int gMemIndex = 0; | |
53 | static int gMemAlloc = 0; | |
54 | static int gMemInUse = 0; | |
55 | ||
56 | #endif /* DEBUG_MEM */ | |
57 | ||
58 | void *gmalloc(int size) { | |
59 | #ifdef DEBUG_MEM | |
60 | int size1; | |
61 | char *mem; | |
62 | GMemHdr *hdr; | |
63 | void *data; | |
64 | int lst; | |
65 | unsigned long *trl, *p; | |
66 | ||
bd7854cb | 67 | if (size <= 0) |
ef416fc2 | 68 | return NULL; |
69 | size1 = gMemDataSize(size); | |
70 | if (!(mem = (char *)malloc(size1 + gMemHdrSize + gMemTrlSize))) { | |
71 | fprintf(stderr, "Out of memory\n"); | |
72 | exit(1); | |
73 | } | |
74 | hdr = (GMemHdr *)mem; | |
75 | data = (void *)(mem + gMemHdrSize); | |
76 | trl = (unsigned long *)(mem + gMemHdrSize + size1); | |
77 | hdr->size = size; | |
78 | hdr->index = gMemIndex++; | |
79 | lst = ((int)hdr >> gMemListShift) & gMemListMask; | |
80 | hdr->next = gMemList[lst]; | |
81 | gMemList[lst] = hdr; | |
82 | ++gMemAlloc; | |
83 | gMemInUse += size; | |
84 | for (p = (unsigned long *)data; p <= trl; ++p) | |
85 | *p = gMemDeadVal; | |
86 | return data; | |
87 | #else | |
88 | void *p; | |
89 | ||
bd7854cb | 90 | if (size <= 0) |
ef416fc2 | 91 | return NULL; |
92 | if (!(p = malloc(size))) { | |
93 | fprintf(stderr, "Out of memory\n"); | |
94 | exit(1); | |
95 | } | |
96 | return p; | |
97 | #endif | |
98 | } | |
99 | ||
100 | void *grealloc(void *p, int size) { | |
101 | #ifdef DEBUG_MEM | |
102 | GMemHdr *hdr; | |
103 | void *q; | |
104 | int oldSize; | |
105 | ||
bd7854cb | 106 | if (size <= 0) { |
ef416fc2 | 107 | if (p) |
108 | gfree(p); | |
109 | return NULL; | |
110 | } | |
111 | if (p) { | |
112 | hdr = (GMemHdr *)((char *)p - gMemHdrSize); | |
113 | oldSize = hdr->size; | |
114 | q = gmalloc(size); | |
115 | memcpy(q, p, size < oldSize ? size : oldSize); | |
116 | gfree(p); | |
117 | } else { | |
118 | q = gmalloc(size); | |
119 | } | |
120 | return q; | |
121 | #else | |
122 | void *q; | |
123 | ||
bd7854cb | 124 | if (size <= 0) { |
ef416fc2 | 125 | if (p) |
126 | free(p); | |
127 | return NULL; | |
128 | } | |
129 | if (p) | |
130 | q = realloc(p, size); | |
131 | else | |
132 | q = malloc(size); | |
133 | if (!q) { | |
134 | fprintf(stderr, "Out of memory\n"); | |
135 | exit(1); | |
136 | } | |
137 | return q; | |
138 | #endif | |
139 | } | |
140 | ||
141 | void *gmallocn(int nObjs, int objSize) { | |
142 | int n; | |
143 | ||
bd7854cb | 144 | if (nObjs == 0) { |
145 | return NULL; | |
146 | } | |
ef416fc2 | 147 | n = nObjs * objSize; |
bd7854cb | 148 | if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) { |
ef416fc2 | 149 | fprintf(stderr, "Bogus memory allocation size\n"); |
150 | exit(1); | |
151 | } | |
152 | return gmalloc(n); | |
153 | } | |
154 | ||
155 | void *greallocn(void *p, int nObjs, int objSize) { | |
156 | int n; | |
157 | ||
bd7854cb | 158 | if (nObjs == 0) { |
159 | if (p) { | |
160 | gfree(p); | |
161 | } | |
162 | return NULL; | |
163 | } | |
ef416fc2 | 164 | n = nObjs * objSize; |
bd7854cb | 165 | if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) { |
ef416fc2 | 166 | fprintf(stderr, "Bogus memory allocation size\n"); |
167 | exit(1); | |
168 | } | |
169 | return grealloc(p, n); | |
170 | } | |
171 | ||
172 | void gfree(void *p) { | |
173 | #ifdef DEBUG_MEM | |
174 | int size; | |
175 | GMemHdr *hdr; | |
176 | GMemHdr *prevHdr, *q; | |
177 | int lst; | |
178 | unsigned long *trl, *clr; | |
179 | ||
180 | if (p) { | |
181 | hdr = (GMemHdr *)((char *)p - gMemHdrSize); | |
182 | lst = ((int)hdr >> gMemListShift) & gMemListMask; | |
183 | for (prevHdr = NULL, q = gMemList[lst]; q; prevHdr = q, q = q->next) { | |
184 | if (q == hdr) | |
185 | break; | |
186 | } | |
187 | if (q) { | |
188 | if (prevHdr) | |
189 | prevHdr->next = hdr->next; | |
190 | else | |
191 | gMemList[lst] = hdr->next; | |
192 | --gMemAlloc; | |
193 | gMemInUse -= hdr->size; | |
194 | size = gMemDataSize(hdr->size); | |
195 | trl = (unsigned long *)((char *)hdr + gMemHdrSize + size); | |
196 | if (*trl != gMemDeadVal) { | |
197 | fprintf(stderr, "Overwrite past end of block %d at address %p\n", | |
198 | hdr->index, p); | |
199 | } | |
200 | for (clr = (unsigned long *)hdr; clr <= trl; ++clr) | |
201 | *clr = gMemDeadVal; | |
202 | free(hdr); | |
203 | } else { | |
204 | fprintf(stderr, "Attempted to free bad address %p\n", p); | |
205 | } | |
206 | } | |
207 | #else | |
208 | if (p) | |
209 | free(p); | |
210 | #endif | |
211 | } | |
212 | ||
213 | #ifdef DEBUG_MEM | |
214 | void gMemReport(FILE *f) { | |
215 | GMemHdr *p; | |
216 | int lst; | |
217 | ||
218 | fprintf(f, "%d memory allocations in all\n", gMemIndex); | |
219 | if (gMemAlloc > 0) { | |
220 | fprintf(f, "%d memory blocks left allocated:\n", gMemAlloc); | |
221 | fprintf(f, " index size\n"); | |
222 | fprintf(f, "-------- --------\n"); | |
223 | for (lst = 0; lst < gMemNLists; ++lst) { | |
224 | for (p = gMemList[lst]; p; p = p->next) | |
225 | fprintf(f, "%8d %8d\n", p->index, p->size); | |
226 | } | |
227 | } else { | |
228 | fprintf(f, "No memory blocks left allocated\n"); | |
229 | } | |
230 | } | |
231 | #endif | |
232 | ||
233 | char *copyString(char *s) { | |
234 | char *s1; | |
235 | ||
236 | s1 = (char *)gmalloc(strlen(s) + 1); | |
237 | strcpy(s1, s); | |
238 | return s1; | |
239 | } |