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Explain why p + n isn't good enough

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-11-25 13:34:59 +01:00
parent 5a34b36bbd
commit 7d23778178
1 changed files with 4 additions and 2 deletions
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6
library/common.h
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@ -73,6 +73,9 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
*
* This is just the addition of an offset to a pointer, except that this
* function also accepts an offset of 0 into a buffer whose pointer is null.
* (`p + n` has undefined behavior when `p` is null, even when `n == 0`.
* A null pointer is a valid buffer pointer when the size is 0, for example
* as the result of `malloc(0)` on some platforms.)
*
* \param p Pointer to a buffer of at least n bytes.
* This may be \p NULL if \p n is zero.
@ -89,8 +92,7 @@ static inline unsigned char *mbedtls_buffer_offset(
/** Return an offset into a read-only buffer.
*
* This is just the addition of an offset to a pointer, except that this
* function also accepts an offset of 0 into a buffer whose pointer is null.
* Similar to mbedtls_buffer_offset(), but for const pointers.
*
* \param p Pointer to a buffer of at least n bytes.
* This may be \p NULL if \p n is zero.