buffer(3) OpenSSL buffer(3)

NAME
       BUFMEMnew, BUFMEMfree, BUFMEMgrow, BUFstrdup - simple character
       arrays structure

SYNOPSIS
        #include 

        BUFMEM *BUFMEMnew(void);

        void   BUFMEMfree(BUFMEM *a);

        int    BUFMEMgrow(BUFMEM *str, int len);

        char * BUFstrdup(const char *str);

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

       The library uses the BUFMEM structure defined in buffer.h:

        typedef struct bufmemst
        {
               int length;     /* current number of bytes */
               char *data;
               int max;        /* size of buffer */
        } BUFMEM;

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

       BUFMEMnew() allocates a new buffer of zero size.

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

       BUFMEMgrow() changes the size of an already existing buffer to lleenn.
       Any data already in the buffer is preserved if it increases in size.

       BUFstrdup() 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 OPENSSLmalloc() and so
       should be used in preference to the standard library strdup() because
       it can be used for memory leak checking or replacing the malloc()
       function.

       The memory allocated from BUFstrdup() should be freed up using the
       OPENSSLfree() function.

RETURN VALUES
       BUFMEMnew() returns the buffer or NULL on error.

       BUFMEMfree() has no return value.

       BUFMEMgrow() returns zero on error or the new size (i.e. lleenn).

SEE ALSO
       bio(3)

HISTORY       BUFMEMnew(), BUFMEMfree() and BUFMEMgrow() are available in all
       versions of SSLeay and OpenSSL. BUFstrdup() was added in SSLeay 0.8.



0.9.7l                            2000-09-19                         buffer(3)