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/*
* gmem.c
*
* Memory routines with out-of-memory checking.
*
* Copyright 1996 Derek B. Noonburg
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include "gmem.h"
#ifdef DEBUG_MEM
typedef struct _GMemHdr {
int size;
int index;
struct _GMemHdr *next;
} GMemHdr;
#define gMemHdrSize ((sizeof(GMemHdr) + 7) & ~7)
#define gMemTrlSize (sizeof(long))
#if gmemTrlSize==8
#define gMemDeadVal 0xdeadbeefdeadbeef
#else
#define gMemDeadVal 0xdeadbeef
/* round data size so trailer will be aligned */
#define gMemDataSize(size) \
((((size) + gMemTrlSize - 1) / gMemTrlSize) * gMemTrlSize)
#endif
static GMemHdr *gMemList = NULL;
static int gMemIndex = 0;
static int gMemAlloc = 0;
#endif
void *gmalloc(int size) {
#if DEBUG_MEM
int size1;
char *mem;
GMemHdr *hdr;
void *data;
long *trl, *p;
if (size == 0)
return NULL;
size1 = gMemDataSize(size);
if (!(mem = (char *)malloc(size1 + gMemHdrSize + gMemTrlSize))) {
fprintf(stderr, "Out of memory\n");
exit(1);
}
hdr = (GMemHdr *)mem;
data = (void *)(mem + gMemHdrSize);
trl = (long *)(mem + gMemHdrSize + size1);
hdr->size = size;
hdr->index = gMemIndex++;
hdr->next = gMemList;
gMemList = hdr;
++gMemAlloc;
for (p = (long *)data; p <= trl; ++p)
*p = gMemDeadVal;
return data;
#else
void *p;
if (size == 0)
return NULL;
if (!(p = malloc(size))) {
fprintf(stderr, "Out of memory\n");
exit(1);
}
return p;
#endif
}
void *grealloc(void *p, int size) {
#if DEBUG_MEM
GMemHdr *hdr;
void *q;
int oldSize;
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) {
if (p)
free(p);
return NULL;
}
if (p)
q = realloc(p, size);
else
q = malloc(size);
if (!q) {
fprintf(stderr, "Out of memory\n");
exit(1);
}
return q;
#endif
}
void gfree(void *p) {
#ifdef DEBUG_MEM
int size;
GMemHdr *hdr;
GMemHdr *prevHdr, *q;
long *trl, *clr;
if (p) {
hdr = (GMemHdr *)((char *)p - gMemHdrSize);
for (prevHdr = NULL, q = gMemList; q; prevHdr = q, q = q->next) {
if (q == hdr)
break;
}
if (q) {
if (prevHdr)
prevHdr->next = hdr->next;
else
gMemList = hdr->next;
--gMemAlloc;
size = gMemDataSize(hdr->size);
trl = (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 = (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
}
#ifdef DEBUG_MEM
void gMemReport(FILE *f) {
GMemHdr *p;
fprintf(f, "%d memory allocations in all\n", gMemIndex);
if (gMemAlloc > 0) {
fprintf(f, "%d memory blocks left allocated:\n", gMemAlloc);
fprintf(f, " index size\n");
fprintf(f, "-------- --------\n");
for (p = gMemList; 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(char *s) {
char *s1;
s1 = (char *)gmalloc(strlen(s) + 1);
strcpy(s1, s);
return s1;
}
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