diff options
| -rw-r--r-- | src/libstrongswan/utils/utils.h | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/src/libstrongswan/utils/utils.h b/src/libstrongswan/utils/utils.h index 961ddb583..3c1a203a1 100644 --- a/src/libstrongswan/utils/utils.h +++ b/src/libstrongswan/utils/utils.h @@ -167,6 +167,39 @@ static inline bool memeq(const void *x, const void *y, size_t len) } /** + * Calling memcpy() with NULL pointers, even with n == 0, results in undefined + * behavior according to the C standard. This version is guaranteed to not + * access the pointers if n is 0. + */ +static inline void *memcpy_noop(void *dst, const void *src, size_t n) +{ + return n ? memcpy(dst, src, n) : dst; +} +#define memcpy(d,s,n) memcpy_noop(d,s,n) + +/** + * Calling memmove() with NULL pointers, even with n == 0, results in undefined + * behavior according to the C standard. This version is guaranteed to not + * access the pointers if n is 0. + */ +static inline void *memmove_noop(void *dst, const void *src, size_t n) +{ + return n ? memmove(dst, src, n) : dst; +} +#define memmove(d,s,n) memmove_noop(d,s,n) + +/** + * Calling memset() with a NULL pointer, even with n == 0, results in undefined + * behavior according to the C standard. This version is guaranteed to not + * access the pointer if n is 0. + */ +static inline void *memset_noop(void *s, int c, size_t n) +{ + return n ? memset(s, c, n) : s; +} +#define memset(s,c,n) memset_noop(s,c,n) + +/** * Macro gives back larger of two values. */ #define max(x,y) ({ \ @@ -174,7 +207,6 @@ static inline bool memeq(const void *x, const void *y, size_t len) typeof(y) _y = (y); \ _x > _y ? _x : _y; }) - /** * Macro gives back smaller of two values. */ |