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/*
* gmem.c
*
* Memory routines with out-of-memory checking.
*
* Copyright 1996-2003 Glyph & Cog, LLC
*/
#include <aconf.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <limits.h>
#include "gmem.h"
#ifdef DEBUG_MEM
typedef struct _GMemHdr {
unsigned int magic;
int size;
int index;
struct _GMemHdr *next, *prev;
} GMemHdr;
#define gMemHdrSize ((sizeof(GMemHdr) + 7) & ~7)
#define gMemTrlSize (sizeof(long))
#define gMemMagic 0xabcd9999
#if gmemTrlSize==8
#define gMemDeadVal 0xdeadbeefdeadbeefUL
#else
#define gMemDeadVal 0xdeadbeefUL
#endif
/* round data size so trailer will be aligned */
#define gMemDataSize(size) \
((((size) + gMemTrlSize - 1) / gMemTrlSize) * gMemTrlSize)
static GMemHdr *gMemHead = NULL;
static GMemHdr *gMemTail = NULL;
static int gMemIndex = 0;
static int gMemAlloc = 0;
static int gMemInUse = 0;
static int gMaxMemInUse = 0;
#endif /* DEBUG_MEM */
void *gmalloc(int size) GMEM_EXCEP {
#ifdef DEBUG_MEM
int size1;
char *mem;
GMemHdr *hdr;
void *data;
unsigned long *trl, *p;
if (size < 0) {
gMemError("Invalid memory allocation size");
}
if (size == 0) {
return NULL;
}
size1 = gMemDataSize(size);
if (!(mem = (char *)malloc(size1 + gMemHdrSize + gMemTrlSize))) {
gMemError("Out of memory");
}
hdr = (GMemHdr *)mem;
data = (void *)(mem + gMemHdrSize);
trl = (unsigned long *)(mem + gMemHdrSize + size1);
hdr->magic = gMemMagic;
hdr->size = size;
hdr->index = gMemIndex++;
if (gMemTail) {
gMemTail->next = hdr;
hdr->prev = gMemTail;
gMemTail = hdr;
} else {
hdr->prev = NULL;
gMemHead = gMemTail = hdr;
}
hdr->next = NULL;
++gMemAlloc;
gMemInUse += size;
if (gMemInUse > gMaxMemInUse) {
gMaxMemInUse = gMemInUse;
}
for (p = (unsigned long *)data; p <= trl; ++p) {
*p = gMemDeadVal;
}
return data;
#else
void *p;
if (size < 0) {
gMemError("Invalid memory allocation size");
}
if (size == 0) {
return NULL;
}
if (!(p = malloc(size))) {
gMemError("Out of memory");
}
return p;
#endif
}
void *grealloc(void *p, int size) GMEM_EXCEP {
#ifdef DEBUG_MEM
GMemHdr *hdr;
void *q;
int oldSize;
if (size < 0) {
gMemError("Invalid memory allocation size");
}
if (size == 0) {
if (p) {
gfree(p);
}
return NULL;
}
if (p) {
hdr = (GMemHdr *)((char *)p - gMemHdrSize);
oldSize = hdr->size;
q = gmalloc(size);
memcpy(q, p, size < oldSize ? size : oldSize);
gfree(p);
} else {
q = gmalloc(size);
}
return q;
#else
void *q;
if (size < 0) {
gMemError("Invalid memory allocation size");
}
if (size == 0) {
if (p) {
free(p);
}
return NULL;
}
if (p) {
q = realloc(p, size);
} else {
q = malloc(size);
}
if (!q) {
gMemError("Out of memory");
}
return q;
#endif
}
void *gmallocn(int nObjs, int objSize) GMEM_EXCEP {
int n;
if (nObjs == 0) {
return NULL;
}
n = nObjs * objSize;
if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) {
gMemError("Bogus memory allocation size");
}
return gmalloc(n);
}
void *greallocn(void *p, int nObjs, int objSize) GMEM_EXCEP {
int n;
if (nObjs == 0) {
if (p) {
gfree(p);
}
return NULL;
}
n = nObjs * objSize;
if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) {
gMemError("Bogus memory allocation size");
}
return grealloc(p, n);
}
void gfree(void *p) {
#ifdef DEBUG_MEM
int size;
GMemHdr *hdr;
unsigned long *trl, *clr;
if (p) {
hdr = (GMemHdr *)((char *)p - gMemHdrSize);
if (hdr->magic == gMemMagic &&
((hdr->prev == NULL) == (hdr == gMemHead)) &&
((hdr->next == NULL) == (hdr == gMemTail))) {
if (hdr->prev) {
hdr->prev->next = hdr->next;
} else {
gMemHead = hdr->next;
}
if (hdr->next) {
hdr->next->prev = hdr->prev;
} else {
gMemTail = hdr->prev;
}
--gMemAlloc;
gMemInUse -= hdr->size;
size = gMemDataSize(hdr->size);
trl = (unsigned long *)((char *)hdr + gMemHdrSize + size);
if (*trl != gMemDeadVal) {
fprintf(stderr, "Overwrite past end of block %d at address %p\n",
hdr->index, p);
}
for (clr = (unsigned long *)hdr; clr <= trl; ++clr) {
*clr = gMemDeadVal;
}
free(hdr);
} else {
fprintf(stderr, "Attempted to free bad address %p\n", p);
}
}
#else
if (p) {
free(p);
}
#endif
}
void gMemError(const char *msg) GMEM_EXCEP {
#if USE_EXCEPTIONS
throw GMemException();
#else
fprintf(stderr, "%s\n", msg);
exit(1);
#endif
}
#ifdef DEBUG_MEM
void gMemReport(FILE *f) {
GMemHdr *p;
fprintf(f, "%d memory allocations in all\n", gMemIndex);
fprintf(f, "maximum memory in use: %d bytes\n", gMaxMemInUse);
if (gMemAlloc > 0) {
fprintf(f, "%d memory blocks left allocated:\n", gMemAlloc);
fprintf(f, " index size\n");
fprintf(f, "-------- --------\n");
for (p = gMemHead; p; p = p->next) {
fprintf(f, "%8d %8d\n", p->index, p->size);
}
} else {
fprintf(f, "No memory blocks left allocated\n");
}
}
#endif
char *copyString(const char *s) {
char *s1;
s1 = (char *)gmalloc((int)strlen(s) + 1);
strcpy(s1, s);
return s1;
}
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