ber_dupbv

LBER_TYPES(3)              Library Functions Manual              LBER_TYPES(3)

NAME
       ber_int_t, ber_uint_t, ber_len_t, ber_slen_t, ber_tag_t, struct berval,
       BerValue, BerVarray, BerElement, ber_bvfree, ber_bvecfree, ber_bvecadd,
       ber_bvarray_free,  ber_bvarray_add,  ber_bvdup,  ber_dupbv,  ber_bvstr,
       ber_bvstrdup, ber_str2bv, ber_alloc_t, ber_init, ber_init2, ber_free  -
       OpenLDAP LBER types and allocation functions

LIBRARY
       OpenLDAP LBER (liblber, -llber)

SYNOPSIS
       #include <lber.h>

       typedef impl_tag_t ber_tag_t;
       typedef impl_int_t ber_int_t;
       typedef impl_uint_t ber_uint_t;
       typedef impl_len_t ber_len_t;
       typedef impl_slen_t ber_slen_t;

       typedef struct berval {
           ber_len_t bv_len;
           char *bv_val;
       } BerValue, *BerVarray;

       typedef struct berelement BerElement;

       void ber_bvfree(struct berval *bv);

       void ber_bvecfree(struct berval **bvec);

       void ber_bvecadd(struct berval ***bvec, struct berval *bv);

       void ber_bvarray_free(struct berval *bvarray);

       void ber_bvarray_add(BerVarray *bvarray, BerValue *bv);

       struct berval *ber_bvdup(const struct berval *bv);

       struct berval *ber_dupbv(const struct berval *dst, struct berval *src);

       struct berval *ber_bvstr(const char *str);

       struct berval *ber_bvstrdup(const char *str);

       struct  berval  *ber_str2bv(const  char  *str,  ber_len_t len, int dup,
       struct berval *bv);

       BerElement *ber_alloc_t(int options);

       BerElement *ber_init(struct berval *bv);

       void ber_init2(BerElement *ber, struct berval *bv, int options);

       void ber_free(BerElement *ber, int freebuf);

DESCRIPTION
       The following are the basic types and structures defined for  use  with
       the Lightweight BER library.

       ber_int_t  is  a  signed  integer  of at least 32 bits.  It is commonly
       equivalent to int.  ber_uint_t is the unsigned variant of ber_int_t.

       ber_len_t is an unsigned integer of at least 32 bits used to  represent
       a  length.   It  is commonly equivalent to a size_t.  ber_slen_t is the
       signed variant to ber_len_t.

       ber_tag_t is an unsigned integer of at least 32 bits used to  represent
       a BER tag.  It is commonly equivalent to a unsigned long.

       The  actual  definitions of the integral impl_TYPE_t types are platform
       specific.

       BerValue, commonly used as struct berval, is used to hold an  arbitrary
       sequence  of  octets.   bv_val  points to bv_len octets.  bv_val is not
       necessarily terminated by a NULL (zero) octet.   ber_bvfree()  frees  a
       BerValue, pointed to by bv, returned from this API.  If bv is NULL, the
       routine does nothing.

       ber_bvecfree() frees an array of BerValues (and the array), pointed  to
       by  bvec,  returned  from  this API.  If bvec is NULL, the routine does
       nothing.  ber_bvecadd() appends the  bv  pointer  to  the  bvec  array.
       Space  for  the  array is allocated as needed.  The end of the array is
       marked by a NULL pointer.

       ber_bvarray_free() frees an array of BerValues (and the array), pointed
       to by bvarray, returned from this API.  If bvarray is NULL, the routine
       does nothing.  ber_bvarray_add() appends the contents of  the  BerValue
       pointed  to  by  bv to the bvarray array.  Space for the new element is
       allocated as needed.  The end of the array is marked by a BerValue with
       a NULL bv_val field.

       ber_bvdup()  returns  a  copy  of a BerValue.  The routine returns NULL
       upon error (e.g. out of memory).  The caller should use ber_bvfree() to
       deallocate  the resulting BerValue.  ber_dupbv() copies a BerValue from
       src to dst.  If dst is NULL a new BerValue will be  allocated  to  hold
       the  copy.  The routine returns NULL upon error, otherwise it returns a
       pointer to the copy.  If dst is NULL the caller should use ber_bvfree()
       to deallocate the resulting BerValue, otherwise ber_memfree() should be
       used to deallocate the dst->bv_val.  (The ber_bvdup() function  is  in-
       ternally  implemented  as ber_dupbv(NULL, bv).  ber_bvdup() is provided
       only for compatibility with  an  expired  draft  of  the  LDAP  C  API;
       ber_dupbv() is the preferred interface.)

       ber_bvstr() returns a BerValue containing the string pointed to by str.
       ber_bvstrdup() returns a BerValue  containing  a  copy  of  the  string
       pointed  to  by  str.   ber_str2bv()  returns a BerValue containing the
       string pointed to by str, whose length may be optionally  specified  in
       len.   If dup is non-zero, the BerValue will contain a copy of str.  If
       len is zero, the  number  of  bytes  to  copy  will  be  determined  by
       strlen(3),  otherwise len bytes will be copied.  If bv is non-NULL, the
       result will be stored in the given BerValue, otherwise a  new  BerValue
       will  be  allocated  to  store  the result.  NOTE: Both ber_bvstr() and
       ber_bvstrdup() are implemented as macros  using  ber_str2bv()  in  this
       version of the library.

       BerElement  is  an  opaque structure used to maintain state information
       used in encoding and decoding.  ber_alloc_t()  is  used  to  create  an
       empty  BerElement  structure.  If LBER_USE_DER is specified for the op-
       tions parameter then data lengths for data written  to  the  BerElement
       will  be  encoded  in  the minimal number of octets required, otherwise
       they will always be written as four byte values.  ber_init() creates  a
       BerElement structure that is initialized with a copy of the data in its
       bv parameter.  ber_init2() initializes an existing BerElement ber using
       the  data  in  the  bv  parameter. The data is referenced directly, not
       copied. The  options  parameter  is  the  same  as  for  ber_alloc_t().
       ber_free()  frees  a BerElement pointed to by ber.  If ber is NULL, the
       routine does nothing.  If freebuf is zero, the internal buffer  is  not
       freed.

SEE ALSO
       lber-encode(3), lber-decode(3), lber-memory(3)

ACKNOWLEDGEMENTS
       OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
       <http://www.openldap.org/>.  OpenLDAP Software is derived from the Uni-
       versity of Michigan LDAP 3.3 Release.

OpenLDAP                          2020/01/30                     LBER_TYPES(3)