diff options
Diffstat (limited to 'src/libpiano/piano.h')
| -rw-r--r-- | src/libpiano/piano.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/libpiano/piano.h b/src/libpiano/piano.h index ce66171..d8b84ce 100644 --- a/src/libpiano/piano.h +++ b/src/libpiano/piano.h @@ -310,14 +310,17 @@ size_t PianoListCount (const PianoListHead_t * const l); #define PianoListCountP(l) PianoListCount(&(l)->head) void *PianoListAppend (PianoListHead_t * const l, PianoListHead_t * const e) __attribute__ ((warn_unused_result)); -#define PianoListAppendP(l,e) PianoListAppend(&(l)->head, &(e)->head) +#define PianoListAppendP(l,e) PianoListAppend(((l) == NULL) ? NULL : &(l)->head, \ + &(e)->head) void *PianoListDelete (PianoListHead_t * const l, PianoListHead_t * const e) __attribute__ ((warn_unused_result)); -#define PianoListDeleteP(l,e) PianoListDelete(&(l)->head, &(e)->head) +#define PianoListDeleteP(l,e) PianoListDelete(((l) == NULL) ? NULL : &(l)->head, \ + &(e)->head) #define PianoListNextP(e) ((void *) (e)->head.next) void *PianoListPrepend (PianoListHead_t * const l, PianoListHead_t * const e) __attribute__ ((warn_unused_result)); -#define PianoListPrependP(l,e) PianoListPrepend (&(l)->head, &(e)->head) +#define PianoListPrependP(l,e) PianoListPrepend (((l) == NULL) ? NULL : &(l)->head, \ + &(e)->head) void *PianoListGet (PianoListHead_t * const l, const size_t n); #define PianoListGetP(l,n) PianoListGet (&(l)->head, n) #define PianoListForeachP(l) for (; (l) != NULL; (l) = (void *) (l)->head.next) |