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NAME

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



SYNOPSIS
      #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);




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 contains
     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 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.

     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.









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Created 1996-2024 by Maxim Chirkov

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