buffer(3)

buffer(3)                    OpenSSL                    buffer(3)

NAME

     BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow -
     simple character array structure

     BUF_strdup, BUF_strndup, BUF_memdup, BUF_strlcpy,
     BUF_strlcat - standard C library equivalents

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);

      char *BUF_strndup(const char *str, size_t siz);

      void *BUF_memdup(const void *data, size_t siz);

      size_t BUF_strlcpy(char *dst, const char *src, size_t size);

      size_t BUF_strlcat(char *dst, const char *src, size_t size);

      size_t BUF_strnlen(const char *str, size_t maxlen);

DESCRIPTION

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

     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(), BUF_strndup(), BUF_memdup(), BUF_strlcpy(),
     BUF_strlcat() and BUF_strnlen are equivalents of the
     standard C library functions. The dup() functions use
     OPENSSL_malloc() underneath and so should be used in
     preference to the standard library for memory leak checking
     or replacing the malloc() function.

     Memory allocated from these functions should be freed up
     using the OPENSSL_free() function.

1.0.2t               Last change: 2019-09-10                    1

buffer(3)                    OpenSSL                    buffer(3)

     BUF_strndup makes the explicit guarantee that it will never
     read past the first siz bytes of str.

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.

1.0.2t               Last change: 2019-09-10                    2