/
xmlmemory.c
1120 lines (983 loc) · 25.5 KB
/
xmlmemory.c
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/*
* xmlmemory.c: libxml memory allocator wrapper.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
/* #define DEBUG_MEMORY */
/**
* MEM_LIST:
*
* keep track of all allocated blocks for error reporting
* Always build the memory list !
*/
#ifdef DEBUG_MEMORY_LOCATION
#ifndef MEM_LIST
#define MEM_LIST /* keep a list of all the allocated memory blocks */
#endif
#endif
#include <libxml/globals.h> /* must come before xmlmemory.h */
#include <libxml/xmlmemory.h>
#include <libxml/xmlerror.h>
#include <libxml/threads.h>
static int xmlMemInitialized = 0;
static unsigned long debugMemSize = 0;
static unsigned long debugMemBlocks = 0;
static unsigned long debugMaxMemSize = 0;
static xmlMutexPtr xmlMemMutex = NULL;
void xmlMallocBreakpoint(void);
/************************************************************************
* *
* Macros, variables and associated types *
* *
************************************************************************/
#if !defined(LIBXML_THREAD_ENABLED) && !defined(LIBXML_THREAD_ALLOC_ENABLED)
#ifdef xmlMalloc
#undef xmlMalloc
#endif
#ifdef xmlRealloc
#undef xmlRealloc
#endif
#ifdef xmlMemStrdup
#undef xmlMemStrdup
#endif
#endif
/*
* Each of the blocks allocated begin with a header containing informations
*/
#define MEMTAG 0x5aa5
#define MALLOC_TYPE 1
#define REALLOC_TYPE 2
#define STRDUP_TYPE 3
#define MALLOC_ATOMIC_TYPE 4
#define REALLOC_ATOMIC_TYPE 5
typedef struct memnod {
unsigned int mh_tag;
unsigned int mh_type;
unsigned long mh_number;
size_t mh_size;
#ifdef MEM_LIST
struct memnod *mh_next;
struct memnod *mh_prev;
#endif
const char *mh_file;
unsigned int mh_line;
} MEMHDR;
#ifdef SUN4
#define ALIGN_SIZE 16
#else
#define ALIGN_SIZE sizeof(double)
#endif
#define HDR_SIZE sizeof(MEMHDR)
#define RESERVE_SIZE (((HDR_SIZE + (ALIGN_SIZE-1)) \
/ ALIGN_SIZE ) * ALIGN_SIZE)
#define CLIENT_2_HDR(a) ((MEMHDR *) (((char *) (a)) - RESERVE_SIZE))
#define HDR_2_CLIENT(a) ((void *) (((char *) (a)) + RESERVE_SIZE))
static unsigned int block=0;
static unsigned int xmlMemStopAtBlock = 0;
static void *xmlMemTraceBlockAt = NULL;
#ifdef MEM_LIST
static MEMHDR *memlist = NULL;
#endif
static void debugmem_tag_error(void *addr);
#ifdef MEM_LIST
static void debugmem_list_add(MEMHDR *);
static void debugmem_list_delete(MEMHDR *);
#endif
#define Mem_Tag_Err(a) debugmem_tag_error(a);
#ifndef TEST_POINT
#define TEST_POINT
#endif
/**
* xmlMallocBreakpoint:
*
* Breakpoint to use in conjunction with xmlMemStopAtBlock. When the block
* number reaches the specified value this function is called. One need to add a breakpoint
* to it to get the context in which the given block is allocated.
*/
void
xmlMallocBreakpoint(void) {
xmlGenericError(xmlGenericErrorContext,
"xmlMallocBreakpoint reached on block %d\n", xmlMemStopAtBlock);
}
/**
* xmlMallocLoc:
* @size: an int specifying the size in byte to allocate.
* @file: the file name or NULL
* @line: the line number
*
* a malloc() equivalent, with logging of the allocation info.
*
* Returns a pointer to the allocated area or NULL in case of lack of memory.
*/
void *
xmlMallocLoc(size_t size, const char * file, int line)
{
MEMHDR *p;
void *ret;
if (!xmlMemInitialized) xmlInitMemory();
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Malloc(%d)\n",size);
#endif
TEST_POINT
p = (MEMHDR *) malloc(RESERVE_SIZE+size);
if (!p) {
xmlGenericError(xmlGenericErrorContext,
"xmlMallocLoc : Out of free space\n");
xmlMemoryDump();
return(NULL);
}
p->mh_tag = MEMTAG;
p->mh_size = size;
p->mh_type = MALLOC_TYPE;
p->mh_file = file;
p->mh_line = line;
xmlMutexLock(xmlMemMutex);
p->mh_number = ++block;
debugMemSize += size;
debugMemBlocks++;
if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
#ifdef MEM_LIST
debugmem_list_add(p);
#endif
xmlMutexUnlock(xmlMemMutex);
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Malloc(%d) Ok\n",size);
#endif
if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
ret = HDR_2_CLIENT(p);
if (xmlMemTraceBlockAt == ret) {
xmlGenericError(xmlGenericErrorContext,
"%p : Malloc(%ld) Ok\n", xmlMemTraceBlockAt, size);
xmlMallocBreakpoint();
}
TEST_POINT
return(ret);
}
/**
* xmlMallocAtomicLoc:
* @size: an int specifying the size in byte to allocate.
* @file: the file name or NULL
* @line: the line number
*
* a malloc() equivalent, with logging of the allocation info.
*
* Returns a pointer to the allocated area or NULL in case of lack of memory.
*/
void *
xmlMallocAtomicLoc(size_t size, const char * file, int line)
{
MEMHDR *p;
void *ret;
if (!xmlMemInitialized) xmlInitMemory();
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Malloc(%d)\n",size);
#endif
TEST_POINT
p = (MEMHDR *) malloc(RESERVE_SIZE+size);
if (!p) {
xmlGenericError(xmlGenericErrorContext,
"xmlMallocLoc : Out of free space\n");
xmlMemoryDump();
return(NULL);
}
p->mh_tag = MEMTAG;
p->mh_size = size;
p->mh_type = MALLOC_ATOMIC_TYPE;
p->mh_file = file;
p->mh_line = line;
xmlMutexLock(xmlMemMutex);
p->mh_number = ++block;
debugMemSize += size;
debugMemBlocks++;
if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
#ifdef MEM_LIST
debugmem_list_add(p);
#endif
xmlMutexUnlock(xmlMemMutex);
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Malloc(%d) Ok\n",size);
#endif
if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
ret = HDR_2_CLIENT(p);
if (xmlMemTraceBlockAt == ret) {
xmlGenericError(xmlGenericErrorContext,
"%p : Malloc(%ld) Ok\n", xmlMemTraceBlockAt, size);
xmlMallocBreakpoint();
}
TEST_POINT
return(ret);
}
/**
* xmlMemMalloc:
* @size: an int specifying the size in byte to allocate.
*
* a malloc() equivalent, with logging of the allocation info.
*
* Returns a pointer to the allocated area or NULL in case of lack of memory.
*/
void *
xmlMemMalloc(size_t size)
{
return(xmlMallocLoc(size, "none", 0));
}
/**
* xmlReallocLoc:
* @ptr: the initial memory block pointer
* @size: an int specifying the size in byte to allocate.
* @file: the file name or NULL
* @line: the line number
*
* a realloc() equivalent, with logging of the allocation info.
*
* Returns a pointer to the allocated area or NULL in case of lack of memory.
*/
void *
xmlReallocLoc(void *ptr,size_t size, const char * file, int line)
{
MEMHDR *p;
unsigned long number;
#ifdef DEBUG_MEMORY
size_t oldsize;
#endif
if (ptr == NULL)
return(xmlMallocLoc(size, file, line));
if (!xmlMemInitialized) xmlInitMemory();
TEST_POINT
p = CLIENT_2_HDR(ptr);
number = p->mh_number;
if (xmlMemStopAtBlock == number) xmlMallocBreakpoint();
if (p->mh_tag != MEMTAG) {
Mem_Tag_Err(p);
goto error;
}
p->mh_tag = ~MEMTAG;
xmlMutexLock(xmlMemMutex);
debugMemSize -= p->mh_size;
debugMemBlocks--;
#ifdef DEBUG_MEMORY
oldsize = p->mh_size;
#endif
#ifdef MEM_LIST
debugmem_list_delete(p);
#endif
xmlMutexUnlock(xmlMemMutex);
p = (MEMHDR *) realloc(p,RESERVE_SIZE+size);
if (!p) {
goto error;
}
if (xmlMemTraceBlockAt == ptr) {
xmlGenericError(xmlGenericErrorContext,
"%p : Realloced(%ld -> %ld) Ok\n",
xmlMemTraceBlockAt, p->mh_size, size);
xmlMallocBreakpoint();
}
p->mh_tag = MEMTAG;
p->mh_number = number;
p->mh_type = REALLOC_TYPE;
p->mh_size = size;
p->mh_file = file;
p->mh_line = line;
xmlMutexLock(xmlMemMutex);
debugMemSize += size;
debugMemBlocks++;
if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
#ifdef MEM_LIST
debugmem_list_add(p);
#endif
xmlMutexUnlock(xmlMemMutex);
TEST_POINT
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Realloced(%d to %d) Ok\n", oldsize, size);
#endif
return(HDR_2_CLIENT(p));
error:
return(NULL);
}
/**
* xmlMemRealloc:
* @ptr: the initial memory block pointer
* @size: an int specifying the size in byte to allocate.
*
* a realloc() equivalent, with logging of the allocation info.
*
* Returns a pointer to the allocated area or NULL in case of lack of memory.
*/
void *
xmlMemRealloc(void *ptr,size_t size) {
return(xmlReallocLoc(ptr, size, "none", 0));
}
/**
* xmlMemFree:
* @ptr: the memory block pointer
*
* a free() equivalent, with error checking.
*/
void
xmlMemFree(void *ptr)
{
MEMHDR *p;
char *target;
#ifdef DEBUG_MEMORY
size_t size;
#endif
if (ptr == NULL)
return;
if (ptr == (void *) -1) {
xmlGenericError(xmlGenericErrorContext,
"trying to free pointer from freed area\n");
goto error;
}
if (xmlMemTraceBlockAt == ptr) {
xmlGenericError(xmlGenericErrorContext,
"%p : Freed()\n", xmlMemTraceBlockAt);
xmlMallocBreakpoint();
}
TEST_POINT
target = (char *) ptr;
p = CLIENT_2_HDR(ptr);
if (p->mh_tag != MEMTAG) {
Mem_Tag_Err(p);
goto error;
}
if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
p->mh_tag = ~MEMTAG;
memset(target, -1, p->mh_size);
xmlMutexLock(xmlMemMutex);
debugMemSize -= p->mh_size;
debugMemBlocks--;
#ifdef DEBUG_MEMORY
size = p->mh_size;
#endif
#ifdef MEM_LIST
debugmem_list_delete(p);
#endif
xmlMutexUnlock(xmlMemMutex);
free(p);
TEST_POINT
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"Freed(%d) Ok\n", size);
#endif
return;
error:
xmlGenericError(xmlGenericErrorContext,
"xmlMemFree(%lX) error\n", (unsigned long) ptr);
xmlMallocBreakpoint();
return;
}
/**
* xmlMemStrdupLoc:
* @str: the initial string pointer
* @file: the file name or NULL
* @line: the line number
*
* a strdup() equivalent, with logging of the allocation info.
*
* Returns a pointer to the new string or NULL if allocation error occurred.
*/
char *
xmlMemStrdupLoc(const char *str, const char *file, int line)
{
char *s;
size_t size = strlen(str) + 1;
MEMHDR *p;
if (!xmlMemInitialized) xmlInitMemory();
TEST_POINT
p = (MEMHDR *) malloc(RESERVE_SIZE+size);
if (!p) {
goto error;
}
p->mh_tag = MEMTAG;
p->mh_size = size;
p->mh_type = STRDUP_TYPE;
p->mh_file = file;
p->mh_line = line;
xmlMutexLock(xmlMemMutex);
p->mh_number = ++block;
debugMemSize += size;
debugMemBlocks++;
if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
#ifdef MEM_LIST
debugmem_list_add(p);
#endif
xmlMutexUnlock(xmlMemMutex);
s = (char *) HDR_2_CLIENT(p);
if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
if (s != NULL)
strcpy(s,str);
else
goto error;
TEST_POINT
if (xmlMemTraceBlockAt == s) {
xmlGenericError(xmlGenericErrorContext,
"%p : Strdup() Ok\n", xmlMemTraceBlockAt);
xmlMallocBreakpoint();
}
return(s);
error:
return(NULL);
}
/**
* xmlMemoryStrdup:
* @str: the initial string pointer
*
* a strdup() equivalent, with logging of the allocation info.
*
* Returns a pointer to the new string or NULL if allocation error occurred.
*/
char *
xmlMemoryStrdup(const char *str) {
return(xmlMemStrdupLoc(str, "none", 0));
}
/**
* xmlMemUsed:
*
* Provides the amount of memory currently allocated
*
* Returns an int representing the amount of memory allocated.
*/
int
xmlMemUsed(void) {
return(debugMemSize);
}
/**
* xmlMemBlocks:
*
* Provides the number of memory areas currently allocated
*
* Returns an int representing the number of blocks
*/
int
xmlMemBlocks(void) {
return(debugMemBlocks);
}
#ifdef MEM_LIST
/**
* xmlMemContentShow:
* @fp: a FILE descriptor used as the output file
* @p: a memory block header
*
* tries to show some content from the memory block
*/
static void
xmlMemContentShow(FILE *fp, MEMHDR *p)
{
int i,j,k,len = p->mh_size;
const char *buf = (const char *) HDR_2_CLIENT(p);
if (p == NULL) {
fprintf(fp, " NULL");
return;
}
for (i = 0;i < len;i++) {
if (buf[i] == 0) break;
if (!isprint((unsigned char) buf[i])) break;
}
if ((i < 4) && ((buf[i] != 0) || (i == 0))) {
if (len >= 4) {
MEMHDR *q;
void *cur;
for (j = 0;(j < len -3) && (j < 40);j += 4) {
cur = *((void **) &buf[j]);
q = CLIENT_2_HDR(cur);
p = memlist;
k = 0;
while (p != NULL) {
if (p == q) break;
p = p->mh_next;
if (k++ > 100) break;
}
if ((p != NULL) && (p == q)) {
fprintf(fp, " pointer to #%lu at index %d",
p->mh_number, j);
return;
}
}
}
} else if ((i == 0) && (buf[i] == 0)) {
fprintf(fp," null");
} else {
if (buf[i] == 0) fprintf(fp," \"%.25s\"", buf);
else {
fprintf(fp," [");
for (j = 0;j < i;j++)
fprintf(fp,"%c", buf[j]);
fprintf(fp,"]");
}
}
}
#endif
/**
* xmlMemDisplayLast:
* @fp: a FILE descriptor used as the output file, if NULL, the result is
* written to the file .memorylist
* @nbBytes: the amount of memory to dump
*
* the last nbBytes of memory allocated and not freed, useful for dumping
* the memory left allocated between two places at runtime.
*/
void
xmlMemDisplayLast(FILE *fp, long nbBytes)
{
#ifdef MEM_LIST
MEMHDR *p;
unsigned idx;
int nb = 0;
#endif
FILE *old_fp = fp;
if (nbBytes <= 0)
return;
if (fp == NULL) {
fp = fopen(".memorylist", "w");
if (fp == NULL)
return;
}
#ifdef MEM_LIST
fprintf(fp," Last %li MEMORY ALLOCATED : %lu, MAX was %lu\n",
nbBytes, debugMemSize, debugMaxMemSize);
fprintf(fp,"BLOCK NUMBER SIZE TYPE\n");
idx = 0;
xmlMutexLock(xmlMemMutex);
p = memlist;
while ((p) && (nbBytes > 0)) {
fprintf(fp,"%-5u %6lu %6lu ",idx++,p->mh_number,
(unsigned long)p->mh_size);
switch (p->mh_type) {
case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
default:
fprintf(fp,"Unknown memory block, may be corrupted");
xmlMutexUnlock(xmlMemMutex);
if (old_fp == NULL)
fclose(fp);
return;
}
if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
if (p->mh_tag != MEMTAG)
fprintf(fp," INVALID");
nb++;
if (nb < 100)
xmlMemContentShow(fp, p);
else
fprintf(fp," skip");
fprintf(fp,"\n");
nbBytes -= (unsigned long)p->mh_size;
p = p->mh_next;
}
xmlMutexUnlock(xmlMemMutex);
#else
fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");
#endif
if (old_fp == NULL)
fclose(fp);
}
/**
* xmlMemDisplay:
* @fp: a FILE descriptor used as the output file, if NULL, the result is
* written to the file .memorylist
*
* show in-extenso the memory blocks allocated
*/
void
xmlMemDisplay(FILE *fp)
{
#ifdef MEM_LIST
MEMHDR *p;
unsigned idx;
int nb = 0;
#if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)
time_t currentTime;
char buf[500];
struct tm * tstruct;
#endif
#endif
FILE *old_fp = fp;
if (fp == NULL) {
fp = fopen(".memorylist", "w");
if (fp == NULL)
return;
}
#ifdef MEM_LIST
#if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)
currentTime = time(NULL);
tstruct = localtime(¤tTime);
strftime(buf, sizeof(buf) - 1, "%I:%M:%S %p", tstruct);
fprintf(fp," %s\n\n", buf);
#endif
fprintf(fp," MEMORY ALLOCATED : %lu, MAX was %lu\n",
debugMemSize, debugMaxMemSize);
fprintf(fp,"BLOCK NUMBER SIZE TYPE\n");
idx = 0;
xmlMutexLock(xmlMemMutex);
p = memlist;
while (p) {
fprintf(fp,"%-5u %6lu %6lu ",idx++,p->mh_number,
(unsigned long)p->mh_size);
switch (p->mh_type) {
case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
default:
fprintf(fp,"Unknown memory block, may be corrupted");
xmlMutexUnlock(xmlMemMutex);
if (old_fp == NULL)
fclose(fp);
return;
}
if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
if (p->mh_tag != MEMTAG)
fprintf(fp," INVALID");
nb++;
if (nb < 100)
xmlMemContentShow(fp, p);
else
fprintf(fp," skip");
fprintf(fp,"\n");
p = p->mh_next;
}
xmlMutexUnlock(xmlMemMutex);
#else
fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");
#endif
if (old_fp == NULL)
fclose(fp);
}
#ifdef MEM_LIST
static void debugmem_list_add(MEMHDR *p)
{
p->mh_next = memlist;
p->mh_prev = NULL;
if (memlist) memlist->mh_prev = p;
memlist = p;
#ifdef MEM_LIST_DEBUG
if (stderr)
Mem_Display(stderr);
#endif
}
static void debugmem_list_delete(MEMHDR *p)
{
if (p->mh_next)
p->mh_next->mh_prev = p->mh_prev;
if (p->mh_prev)
p->mh_prev->mh_next = p->mh_next;
else memlist = p->mh_next;
#ifdef MEM_LIST_DEBUG
if (stderr)
Mem_Display(stderr);
#endif
}
#endif
/*
* debugmem_tag_error:
*
* internal error function.
*/
static void debugmem_tag_error(void *p)
{
xmlGenericError(xmlGenericErrorContext,
"Memory tag error occurs :%p \n\t bye\n", p);
#ifdef MEM_LIST
if (stderr)
xmlMemDisplay(stderr);
#endif
}
#ifdef MEM_LIST
static FILE *xmlMemoryDumpFile = NULL;
#endif
/**
* xmlMemShow:
* @fp: a FILE descriptor used as the output file
* @nr: number of entries to dump
*
* show a show display of the memory allocated, and dump
* the @nr last allocated areas which were not freed
*/
void
xmlMemShow(FILE *fp, int nr ATTRIBUTE_UNUSED)
{
#ifdef MEM_LIST
MEMHDR *p;
#endif
if (fp != NULL)
fprintf(fp," MEMORY ALLOCATED : %lu, MAX was %lu\n",
debugMemSize, debugMaxMemSize);
#ifdef MEM_LIST
xmlMutexLock(xmlMemMutex);
if (nr > 0) {
fprintf(fp,"NUMBER SIZE TYPE WHERE\n");
p = memlist;
while ((p) && nr > 0) {
fprintf(fp,"%6lu %6lu ",p->mh_number,(unsigned long)p->mh_size);
switch (p->mh_type) {
case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
default:fprintf(fp," ??? in ");break;
}
if (p->mh_file != NULL)
fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
if (p->mh_tag != MEMTAG)
fprintf(fp," INVALID");
xmlMemContentShow(fp, p);
fprintf(fp,"\n");
nr--;
p = p->mh_next;
}
}
xmlMutexUnlock(xmlMemMutex);
#endif /* MEM_LIST */
}
/**
* xmlMemoryDump:
*
* Dump in-extenso the memory blocks allocated to the file .memorylist
*/
void
xmlMemoryDump(void)
{
#ifdef MEM_LIST
FILE *dump;
if (debugMaxMemSize == 0)
return;
dump = fopen(".memdump", "w");
if (dump == NULL)
xmlMemoryDumpFile = stderr;
else xmlMemoryDumpFile = dump;
xmlMemDisplay(xmlMemoryDumpFile);
if (dump != NULL) fclose(dump);
#endif /* MEM_LIST */
}
/****************************************************************
* *
* Initialization Routines *
* *
****************************************************************/
/**
* xmlInitMemory:
*
* Initialize the memory layer.
*
* Returns 0 on success
*/
int
xmlInitMemory(void)
{
#ifdef HAVE_STDLIB_H
char *breakpoint;
#endif
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"xmlInitMemory()\n");
#endif
/*
This is really not good code (see Bug 130419). Suggestions for
improvement will be welcome!
*/
if (xmlMemInitialized) return(-1);
xmlMemInitialized = 1;
xmlMemMutex = xmlNewMutex();
#ifdef HAVE_STDLIB_H
breakpoint = getenv("XML_MEM_BREAKPOINT");
if (breakpoint != NULL) {
sscanf(breakpoint, "%ud", &xmlMemStopAtBlock);
}
#endif
#ifdef HAVE_STDLIB_H
breakpoint = getenv("XML_MEM_TRACE");
if (breakpoint != NULL) {
sscanf(breakpoint, "%p", &xmlMemTraceBlockAt);
}
#endif
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"xmlInitMemory() Ok\n");
#endif
return(0);
}
/**
* xmlCleanupMemory:
*
* Free up all the memory allocated by the library for its own
* use. This should not be called by user level code.
*/
void
xmlCleanupMemory(void) {
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"xmlCleanupMemory()\n");
#endif
if (xmlMemInitialized == 0)
return;
xmlFreeMutex(xmlMemMutex);
xmlMemMutex = NULL;
xmlMemInitialized = 0;
#ifdef DEBUG_MEMORY
xmlGenericError(xmlGenericErrorContext,
"xmlCleanupMemory() Ok\n");
#endif
}
/**
* xmlMemSetup:
* @freeFunc: the free() function to use
* @mallocFunc: the malloc() function to use
* @reallocFunc: the realloc() function to use
* @strdupFunc: the strdup() function to use
*
* Override the default memory access functions with a new set
* This has to be called before any other libxml routines !
*
* Should this be blocked if there was already some allocations
* done ?
*
* Returns 0 on success
*/
int
xmlMemSetup(xmlFreeFunc freeFunc, xmlMallocFunc mallocFunc,
xmlReallocFunc reallocFunc, xmlStrdupFunc strdupFunc) {
#ifdef DEBUG_MEMORY