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buffer(3)                    OpenSSL                    buffer(3)

NAME
       BUF_MEM_new, BUF_MEM_free, BUF_MEM_grow, BUF_strdup - sim-
       ple character arrays structure

SYNOPSIS
        #include 

        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);

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 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 */
        } BUF_MEM;

       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.

       BUF_MEM_new() allocates a new buffer of zero size.

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

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

       BUF_strdup() 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 func-
       tion uses OPENSSL_malloc() and so should be used in pref-
       erence to the standard library strdup() because it can be
       used for memory leak checking or replacing the malloc()
       function.

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

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

       BUF_MEM_free() has no return value.

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

SEE ALSO
       bio(3)

HISTORY
       BUF_MEM_new(), BUF_MEM_free() and BUF_MEM_grow() are
       available in all versions of SSLeay and OpenSSL.
       BUF_strdup() was added in SSLeay 0.8.

0.9.7c                      2000-09-20                  buffer(3)

Time taken: 4.25248 seconds


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