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.
BUF_strndup makes the explicit guarantee that it will never read past
the first siz bytes of str.
RETURN VALUESBUF_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 ALSObio(3)HISTORYBUF_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.
1.0.2f 2016-01-28 buffer(3)
