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136 .TH buffer 3 "2015-12-03" "1.0.1q" "OpenSSL"
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142 BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow \- simple
143 character array structure
145 BUF_strdup, BUF_strndup, BUF_memdup, BUF_strlcpy, BUF_strlcat \-
146 standard C library equivalents
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/buffer.h>
152 \& BUF_MEM *BUF_MEM_new(void);
154 \& void BUF_MEM_free(BUF_MEM *a);
156 \& int BUF_MEM_grow(BUF_MEM *str, int len);
158 \& char *BUF_strdup(const char *str);
160 \& char *BUF_strndup(const char *str, size_t siz);
162 \& void *BUF_memdup(const void *data, size_t siz);
164 \& size_t BUF_strlcpy(char *dst, const char *src, size_t size);
166 \& size_t BUF_strlcat(char *dst, const char *src, size_t size);
169 .IX Header "DESCRIPTION"
170 The buffer library handles simple character arrays. Buffers are used for
171 various purposes in the library, most notably memory BIOs.
173 \&\fIBUF_MEM_new()\fR allocates a new buffer of zero size.
175 \&\fIBUF_MEM_free()\fR frees up an already existing buffer. The data is zeroed
176 before freeing up in case the buffer contains sensitive data.
178 \&\fIBUF_MEM_grow()\fR changes the size of an already existing buffer to
179 \&\fBlen\fR. Any data already in the buffer is preserved if it increases in
182 \&\fIBUF_strdup()\fR, \fIBUF_strndup()\fR, \fIBUF_memdup()\fR, \fIBUF_strlcpy()\fR and
183 \&\fIBUF_strlcat()\fR are equivalents of the standard C library functions. The
184 \&\fIdup()\fR functions use \fIOPENSSL_malloc()\fR underneath and so should be used
185 in preference to the standard library for memory leak checking or
186 replacing the \fImalloc()\fR function.
188 Memory allocated from these functions should be freed up using the
189 \&\fIOPENSSL_free()\fR function.
191 BUF_strndup makes the explicit guarantee that it will never read past
192 the first \fBsiz\fR bytes of \fBstr\fR.
194 .IX Header "RETURN VALUES"
195 \&\fIBUF_MEM_new()\fR returns the buffer or \s-1NULL\s0 on error.
197 \&\fIBUF_MEM_free()\fR has no return value.
199 \&\fIBUF_MEM_grow()\fR returns zero on error or the new size (i.e. \fBlen\fR).
201 .IX Header "SEE ALSO"
205 \&\fIBUF_MEM_new()\fR, \fIBUF_MEM_free()\fR and \fIBUF_MEM_grow()\fR are available in all
206 versions of SSLeay and OpenSSL. \fIBUF_strdup()\fR was added in SSLeay 0.8.