libxml2: xmlmemory.h File Reference

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xmlmemory.h File Reference

interface for the memory allocator More...

## Typedefs
typedef void(* | xmlFreeFunc) (void *mem)
| Signature for a free() implementation.
typedef void *(* | xmlMallocFunc) (size_t size)
| Signature for a malloc() implementation.
typedef void *(* | xmlReallocFunc) (void *mem, size_t size)
| Signature for a realloc() implementation.
typedef char *(* | xmlStrdupFunc) (const char *str)
| Signature for an strdup() implementation.

## Functions
int | xmlMemSetup (xmlFreeFunc freeFunc, xmlMallocFunc mallocFunc, xmlReallocFunc reallocFunc, xmlStrdupFunc strdupFunc)
| Override the default memory access functions with a new set This has to be called before any other libxml routines !
int | xmlMemGet (xmlFreeFunc *freeFunc, xmlMallocFunc *mallocFunc, xmlReallocFunc *reallocFunc, xmlStrdupFunc *strdupFunc)
| Provides the memory access functions set currently in use.
int | xmlGcMemSetup (xmlFreeFunc freeFunc, xmlMallocFunc mallocFunc, xmlMallocFunc mallocAtomicFunc, xmlReallocFunc reallocFunc, xmlStrdupFunc strdupFunc)
| Override the default memory access functions with a new set This has to be called before any other libxml routines !
int | xmlGcMemGet (xmlFreeFunc *freeFunc, xmlMallocFunc *mallocFunc, xmlMallocFunc *mallocAtomicFunc, xmlReallocFunc *reallocFunc, xmlStrdupFunc *strdupFunc)
| Provides the memory access functions set currently in use The mallocAtomicFunc is specialized for atomic block allocations (i.e.
int | xmlInitMemory (void)
void | xmlCleanupMemory (void)
size_t | xmlMemSize (void *ptr)
int | xmlMemUsed (void)
| Provides the amount of memory currently allocated.
int | xmlMemBlocks (void)
| Provides the number of memory areas currently allocated.
void | xmlMemDisplay (FILE *fp)
void | xmlMemDisplayLast (FILE *fp, long nbBytes)
void | xmlMemShow (FILE *fp, int nr)
void | xmlMemoryDump (void)
void * | xmlMemMalloc (size_t size)
| a malloc() equivalent, with logging of the allocation info.
void * | xmlMemRealloc (void *ptr, size_t size)
| a realloc() equivalent, with logging of the allocation info.
void | xmlMemFree (void *ptr)
| a free() equivalent, with error checking.
char * | xmlMemoryStrdup (const char *str)
| a strdup() equivalent, with logging of the allocation info.
void * | xmlMallocLoc (size_t size, const char *file, int line)
void * | xmlReallocLoc (void *ptr, size_t size, const char *file, int line)
void * | xmlMallocAtomicLoc (size_t size, const char *file, int line)
char * | xmlMemStrdupLoc (const char *str, const char *file, int line)

## Variables
xmlMallocFunc | xmlMalloc
| The variable holding the libxml malloc() implementation.
xmlMallocFunc | xmlMallocAtomic
| The variable holding the libxml malloc() implementation for atomic data (i.e.
xmlReallocFunc | xmlRealloc
| The variable holding the libxml realloc() implementation.
xmlFreeFunc | xmlFree
| The variable holding the libxml free() implementation.
xmlStrdupFunc | xmlMemStrdup
| The variable holding the libxml strdup() implementation.

## Detailed Description

interface for the memory allocator

provides interfaces for the memory allocator, including debugging capabilities.

Copyright
  See Copyright for the status of this software.

Author
  Daniel Veillard

## Typedef Documentation

## ◆ xmlFreeFunc

typedef void(* xmlFreeFunc) (void *mem)

Signature for a free() implementation.

Parameters

  mem | an already allocated block of memory

## ◆ xmlMallocFunc

typedef void *(* xmlMallocFunc) (size_t size)

Signature for a malloc() implementation.

Parameters

  size | the size requested in bytes

Returns
  a pointer to the newly allocated block or NULL in case of error.

## ◆ xmlReallocFunc

typedef void *(* xmlReallocFunc) (void *mem, size_t size)

Signature for a realloc() implementation.

Parameters

  mem | an already allocated block of memory
  size | the new size requested in bytes

Returns
  a pointer to the newly reallocated block or NULL in case of error.

## ◆ xmlStrdupFunc

typedef char *(* xmlStrdupFunc) (const char *str)

Signature for an strdup() implementation.

Parameters

  str | a zero terminated string

Returns
  the copy of the string or NULL in case of error.

## Function Documentation

## ◆ xmlCleanupMemory()

void xmlCleanupMemory | ( | void |  | ) |

Deprecated
  This function is a no-op. Call xmlCleanupParser to free global state but see the warnings there. xmlCleanupParser should be only called once at program exit. In most cases, you don't have call cleanup functions at all.

## ◆ xmlGcMemGet()

int xmlGcMemGet | ( | xmlFreeFunc * | freeFunc,
|  | xmlMallocFunc * | mallocFunc,
|  | xmlMallocFunc * | mallocAtomicFunc,
|  | xmlReallocFunc * | reallocFunc,
|  | xmlStrdupFunc * | strdupFunc )

Provides the memory access functions set currently in use The mallocAtomicFunc is specialized for atomic block allocations (i.e.

of areas useful for garbage collected memory allocators

Deprecated
  Use xmlMemGet.

Parameters

  freeFunc | place to save the free() function in use
  mallocFunc | place to save the malloc() function in use
  mallocAtomicFunc | place to save the atomic malloc() function in use
  reallocFunc | place to save the realloc() function in use
  strdupFunc | place to save the strdup() function in use

Returns
  0 on success

## ◆ xmlGcMemSetup()

int xmlGcMemSetup | ( | xmlFreeFunc | freeFunc,
|  | xmlMallocFunc | mallocFunc,
|  | xmlMallocFunc | mallocAtomicFunc,
|  | xmlReallocFunc | reallocFunc,
|  | xmlStrdupFunc | strdupFunc )

Override the default memory access functions with a new set This has to be called before any other libxml routines !

The mallocAtomicFunc is specialized for atomic block allocations (i.e. of areas useful for garbage collected memory allocators

Deprecated
  Use xmlMemSetup.

Should this be blocked if there was already some allocations done ?

Parameters

  freeFunc | the free() function to use
  mallocFunc | the malloc() function to use
  mallocAtomicFunc | the malloc() function to use for atomic allocations
  reallocFunc | the realloc() function to use
  strdupFunc | the strdup() function to use

Returns
  0 on success

## ◆ xmlInitMemory()

int xmlInitMemory | ( | void |  | ) |

Deprecated
  Alias for xmlInitParser.

Returns
  0.

## ◆ xmlMallocAtomicLoc()

void * xmlMallocAtomicLoc | ( | size_t | size,
|  | const char * | file,
|  | int | line )

Deprecated
  don't use

Parameters

  size | an unsigned int specifying the size in byte to allocate.
  file | the file name or NULL
  line | the line number

Returns
  a pointer to the allocated area or NULL in case of lack of memory.

## ◆ xmlMallocLoc()

void * xmlMallocLoc | ( | size_t | size,
|  | const char * | file,
|  | int | line )

Deprecated
  don't use

Parameters

  size | an int specifying the size in byte to allocate.
  file | the file name or NULL
  line | the line number

Returns
  a pointer to the allocated area or NULL in case of lack of memory.

## ◆ xmlMemBlocks()

int xmlMemBlocks | ( | void |  | ) |

Provides the number of memory areas currently allocated.

Returns
  an int representing the number of blocks

## ◆ xmlMemDisplay()

void xmlMemDisplay | ( | FILE * | fp | ) |

Deprecated
  This feature was removed.

Parameters

  fp | a FILE descriptor

## ◆ xmlMemDisplayLast()

void xmlMemDisplayLast | ( | FILE * | fp,
|  | long | nbBytes )

Deprecated
  This feature was removed.

Parameters

  fp | a FILE descriptor
  nbBytes | the amount of memory to dump

## ◆ xmlMemFree()

void xmlMemFree | ( | void * | ptr | ) |

a free() equivalent, with error checking.

Parameters

  ptr | the memory block pointer

## ◆ xmlMemGet()

int xmlMemGet | ( | xmlFreeFunc * | freeFunc,
|  | xmlMallocFunc * | mallocFunc,
|  | xmlReallocFunc * | reallocFunc,
|  | xmlStrdupFunc * | strdupFunc )

Provides the memory access functions set currently in use.

Parameters

  freeFunc | place to save the free() function in use
  mallocFunc | place to save the malloc() function in use
  reallocFunc | place to save the realloc() function in use
  strdupFunc | place to save the strdup() function in use

Returns
  0 on success

## ◆ xmlMemMalloc()

void * xmlMemMalloc | ( | size_t | size | ) |

a malloc() equivalent, with logging of the allocation info.

Parameters

  size | an int specifying the size in byte to allocate.

Returns
  a pointer to the allocated area or NULL in case of lack of memory.

## ◆ xmlMemoryDump()

void xmlMemoryDump | ( | void |  | ) |

Deprecated
  This feature was removed.

## ◆ xmlMemoryStrdup()

char * xmlMemoryStrdup | ( | const char * | str | ) |

a strdup() equivalent, with logging of the allocation info.

Parameters

  str | the initial string pointer

Returns
  a pointer to the new string or NULL if allocation error occurred.

## ◆ xmlMemRealloc()

void * xmlMemRealloc | ( | void * | ptr,
|  | size_t | size )

a realloc() equivalent, with logging of the allocation info.

Parameters

  ptr | the initial memory block pointer
  size | an int specifying the size in byte to allocate.

Returns
  a pointer to the allocated area or NULL in case of lack of memory.

## ◆ xmlMemSetup()

int xmlMemSetup | ( | xmlFreeFunc | freeFunc,
|  | xmlMallocFunc | mallocFunc,
|  | xmlReallocFunc | reallocFunc,
|  | xmlStrdupFunc | strdupFunc )

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 ?

Parameters

  freeFunc | the free() function to use
  mallocFunc | the malloc() function to use
  reallocFunc | the realloc() function to use
  strdupFunc | the strdup() function to use

Returns
  0 on success

## ◆ xmlMemShow()

void xmlMemShow | ( | FILE * | fp,
|  | int | nr )

Deprecated
  This feature was removed.

Parameters

  fp | a FILE descriptor
  nr | number of entries to dump

## ◆ xmlMemSize()

size_t xmlMemSize | ( | void * | ptr | ) |

Parameters

  ptr | pointer to the memory allocation

Returns
  the size of a memory allocation.

## ◆ xmlMemStrdupLoc()

char * xmlMemStrdupLoc | ( | const char * | str,
|  | const char * | file,
|  | int | line )

Deprecated
  don't use

Parameters

  str | the initial string pointer
  file | the file name or NULL
  line | the line number

Returns
  a pointer to the new string or NULL if allocation error occurred.

## ◆ xmlMemUsed()

int xmlMemUsed | ( | void |  | ) |

Provides the amount of memory currently allocated.

Returns
  an int representing the amount of memory allocated.

## ◆ xmlReallocLoc()

void * xmlReallocLoc | ( | void * | ptr,
|  | size_t | size,
|  | const char * | file,
|  | int | line )

Deprecated
  don't use

Parameters

  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

Returns
  a pointer to the allocated area or NULL in case of lack of memory.

## Variable Documentation

## ◆ xmlMallocAtomic

xmlMallocFunc xmlMallocAtomic
| extern

The variable holding the libxml malloc() implementation for atomic data (i.e.

blocks not containing pointers), useful when using a garbage collecting allocator.

Deprecated
  Use xmlMalloc