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-rw-r--r--doc/crypto/buffer.pod49
1 files changed, 26 insertions, 23 deletions
diff --git a/doc/crypto/buffer.pod b/doc/crypto/buffer.pod
index 781f5b11ee54..52c5c841eb03 100644
--- a/doc/crypto/buffer.pod
+++ b/doc/crypto/buffer.pod
@@ -2,8 +2,11 @@
=head1 NAME
-BUF_MEM_new, BUF_MEM_free, BUF_MEM_grow, BUF_strdup - simple
-character arrays structure
+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
=head1 SYNOPSIS
@@ -15,25 +18,22 @@ character arrays structure
int BUF_MEM_grow(BUF_MEM *str, int len);
- char * BUF_strdup(const char *str);
+ char *BUF_strdup(const char *str);
-=head1 DESCRIPTION
+ char *BUF_strndup(const char *str, size_t siz);
-The buffer library handles simple character arrays. Buffers are used for
-various purposes in the library, most notably memory BIOs.
+ void *BUF_memdup(const void *data, size_t siz);
+
+ size_t BUF_strlcpy(char *dst, const char *src, size_t size);
-The library uses the BUF_MEM structure defined in buffer.h:
+ size_t BUF_strlcat(char *dst, const char *src, size_t size);
- typedef struct buf_mem_st
- {
- int length; /* current number of bytes */
- char *data;
- int max; /* size of buffer */
- } BUF_MEM;
+ size_t BUF_strnlen(const char *str, size_t maxlen);
-B<length> is the current size of the buffer in bytes, B<max> is the amount of
-memory allocated to the buffer. There are three functions which handle these
-and one "miscellaneous" function.
+=head1 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.
@@ -44,14 +44,17 @@ BUF_MEM_grow() changes the size of an already existing buffer to
B<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.
+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.
-The memory allocated from BUF_strdup() should be freed up using the OPENSSL_free()
-function.
+BUF_strndup makes the explicit guarantee that it will never read past
+the first B<siz> bytes of B<str>.
=head1 RETURN VALUES