Manual Pages for UNIX Operating System command usage for man buffer

OpenSSL                                          buffer(3openssl)



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     BUF_MEM_new, BUF_MEM_free, BUF_MEM_grow, BUF_strdup - simple
     character arrays structure

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      #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);


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     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;

     lllleeeennnnggggtttthhhh is the current size of the buffer in bytes, mmmmaaaaxxxx 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 contains
     sensitive data.

     BUF_MEM_grow() changes the size of an already existing
     buffer to lllleeeennnn. 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 function
     uses OPENSSL_malloc() 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.




19/Sep/2000            Last change: 0.9.8o                      1






OpenSSL                                          buffer(3openssl)



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

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     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.
     lllleeeennnn).

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     bio(3)

HHHHIIIISSSSTTTTOOOORRRRYYYY
     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.





































19/Sep/2000            Last change: 0.9.8o                      2