1buffer(3)                           OpenSSL                          buffer(3)
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NAME

6       BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow - simple
7       character array structure
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9       BUF_strdup, BUF_strndup, BUF_memdup, BUF_strlcpy, BUF_strlcat -
10       standard C library equivalents
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SYNOPSIS

13        #include <openssl/buffer.h>
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15        BUF_MEM *BUF_MEM_new(void);
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17        void   BUF_MEM_free(BUF_MEM *a);
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19        int    BUF_MEM_grow(BUF_MEM *str, int len);
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21        char *BUF_strdup(const char *str);
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23        char *BUF_strndup(const char *str, size_t siz);
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25        void *BUF_memdup(const void *data, size_t siz);
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27        size_t BUF_strlcpy(char *dst, const char *src, size_t size);
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29        size_t BUF_strlcat(char *dst, const char *src, size_t size);
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31        size_t BUF_strnlen(const char *str, size_t maxlen);
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DESCRIPTION

34       The buffer library handles simple character arrays. Buffers are used
35       for various purposes in the library, most notably memory BIOs.
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37       BUF_MEM_new() allocates a new buffer of zero size.
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39       BUF_MEM_free() frees up an already existing buffer. The data is zeroed
40       before freeing up in case the buffer contains sensitive data.
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42       BUF_MEM_grow() changes the size of an already existing buffer to len.
43       Any data already in the buffer is preserved if it increases in size.
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45       BUF_strdup(), BUF_strndup(), BUF_memdup(), BUF_strlcpy(), BUF_strlcat()
46       and BUF_strnlen are equivalents of the standard C library functions.
47       The dup() functions use OPENSSL_malloc() underneath and so should be
48       used in preference to the standard library for memory leak checking or
49       replacing the malloc() function.
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51       Memory allocated from these functions should be freed up using the
52       OPENSSL_free() function.
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54       BUF_strndup makes the explicit guarantee that it will never read past
55       the first siz bytes of str.
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RETURN VALUES

58       BUF_MEM_new() returns the buffer or NULL on error.
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60       BUF_MEM_free() has no return value.
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62       BUF_MEM_grow() returns zero on error or the new size (i.e. len).
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SEE ALSO

65       bio(3)
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HISTORY

68       BUF_MEM_new(), BUF_MEM_free() and BUF_MEM_grow() are available in all
69       versions of SSLeay and OpenSSL. BUF_strdup() was added in SSLeay 0.8.
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731.0.2o                            2019-09-10                         buffer(3)