Buffer man page on DigitalUNIX

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buffer(3)							     buffer(3)

       buffer,	BUF_MEM_new,  BUF_MEM_free,  BUF_MEM_grow, BUF_strdup - Simple
       character arrays structure

       #include <openssl/buffer.h>

       BUF_MEM *BUF_MEM_new(
	       void ); void BUF_MEM_free(
	       BUF_MEM *a ); int   BUF_MEM_grow(
	       BUF_MEM *str, int len ); char * BUF_strdup(
	       const char *str );

       The buffer library handles simple character arrays.  Buffers  are  used
       for various purposes in the library, most notably memory BIOs.

       The library uses the BUF_MEM structure defined in buffer.h:
	typedef struct buf_mem_st
	       int length;     /* current number of bytes */
	       char *data;
	       int max;	       /* size of buffer */

       The  length  is	the  current  size  of the buffer in bytes, max is the
       amount of memory allocated to the buffer.  There	 are  three  functions
       which handle these and one miscellaneous function.

       The BUF_MEM_new() function allocates a new buffer of zero size.

       The  BUF_MEM_free()  function  frees up an already existing buffer. The
       data is zeroed before freeing up in case the buffer contains  sensitive

       The  BUF_MEM_grow()  function  changes  the size of an already existing
       buffer to len. Any data already	in  the	 buffer	 is  preserved	if  it
       increases in size.

       The  BUF_strdup() function copies a null terminated string into a block
       of allocated memory and returns	a  pointer  to	the  allocated	block.
       Unlike the standard C library strdup(), this function uses OPENSSL_mal‐
       loc(). It should be used in preference to the standard library strdup()
       because	it  can be used for memory leak checking or replacing the mal‐
       loc() function.

       The memory allocated from the BUF_strdup() function should be freed  up
       using the OPENSSL_free() function.

       The BUF_MEM_new() function returns the buffer or NULL on error.

       The BUF_MEM_free() function has no return value.

       The BUF_MEM_grow() function returns zero on error or the new size (i.e.

       The BUF_MEM_new(), BUF_MEM_free(),  and	BUF_MEM_grow()	functions  are
       available in all versions of SSLeay and OpenSSL. The BUF_strdup() func‐
       tion was added in SSLeay 0.8.

       Function: bio(3)


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