8 #if HAVE_COMPOUND_LITERALS
9 #if HAVE_FOR_LOOP_DECLARATION
11 * foreach_int - iterate over a fixed series of integers
12 * @i: the int-compatible iteration variable
13 * ...: one or more integer-compatible values
15 * This is a convenient wrapper function for setting a variable to one or
16 * more explicit values in turn. continue and break work as expected.
20 * foreach_int(i, 0, -1, 100, 0, -99) {
21 * printf("i is %i\n", i);
24 #define foreach_int(i, ...) \
25 for (unsigned _foreach_i = (((i) = ((int[]) { __VA_ARGS__ })[0]), 0); \
26 _foreach_i < sizeof((int[]) { __VA_ARGS__ })/sizeof(int); \
27 (i) = ((int[]) { __VA_ARGS__, 0 })[++_foreach_i])
30 * foreach_ptr - iterate over a non-NULL series of pointers
31 * @i: the pointer iteration variable
32 * ...: one or more compatible pointer values
34 * This is a convenient wrapper function for setting a variable to one
35 * or more explicit values in turn. None of the values can be NULL;
36 * that is the termination condition (ie. @i will be NULL on
37 * completion). continue and break work as expected.
41 * foreach_ptr(p, "Hello", "world") {
42 * printf("p is %s\n", p);
45 #define foreach_ptr(i, ...) \
46 for (unsigned _foreach_i \
47 = (((i) = ((const void *[]){ __VA_ARGS__ })[0]), 0); \
49 (i) = (void *)((FOREACH_TYPEOF(i)[]) \
50 { __VA_ARGS__, NULL})[++_foreach_i], \
51 _foreach_no_nullval(_foreach_i, i, \
52 ((const void *[]){ __VA_ARGS__})))
53 #else /* !HAVE_FOR_LOOP_DECLARATION */
54 /* GCC in C89 mode still has compound literals, but no for-declarations */
55 #define foreach_int(i, ...) \
56 for ((i) = ((int[]){ __VA_ARGS__ })[0], _foreach_iter_init(&(i)); \
57 _foreach_iter(&(i)) < sizeof((int[]) { __VA_ARGS__ }) \
59 (i) = (int[]) { __VA_ARGS__, 0 }[_foreach_iter_inc(&(i))])
61 #define foreach_ptr(i, ...) \
62 for ((i) = ((FOREACH_TYPEOF(i)[]){ __VA_ARGS__ })[0], \
63 _foreach_iter_init(&(i)); \
65 (i) = (void *)((FOREACH_TYPEOF(i)[]){ __VA_ARGS__, NULL }) \
66 [_foreach_iter_inc(&(i))], \
67 _foreach_no_nullval(_foreach_iter(&(i)), i, \
68 ((void *[]){ __VA_ARGS__})))
70 void _foreach_iter_init(const void *i);
71 unsigned int _foreach_iter(const void *i);
72 unsigned int _foreach_iter_inc(const void *i);
74 #endif /* !HAVE_FOR_LOOP_DECLARATION */
76 /* Make sure they don't put NULL values into array! */
77 #define _foreach_no_nullval(i, p, arr) \
78 assert((i) >= sizeof(arr)/sizeof(arr[0]) || (p))
81 #define FOREACH_TYPEOF(i) __typeof__(i)
83 #define FOREACH_TYPEOF(i) const void *
86 #else /* !HAVE_COMPOUND_LITERALS */
88 /* No compound literals, but it's still (just) possible. */
89 #define foreach_int(i, ...) \
90 for (i = _foreach_intval_init(&(i), __VA_ARGS__, _foreach_term); \
91 !_foreach_intval_done(&i); \
92 i = _foreach_intval_next(&(i), __VA_ARGS__, _foreach_term))
94 #define foreach_ptr(i, ...) \
95 for (i = _foreach_ptrval_init(&(i), __VA_ARGS__, NULL); \
97 i = _foreach_ptrval_next(&(i), __VA_ARGS__, NULL))
99 extern int _foreach_term;
100 int _foreach_intval_init(const void *i, int val, ...);
101 bool _foreach_intval_done(const void *i);
102 int _foreach_intval_next(const void *i, int val, ...);
103 void *_foreach_ptrval_init(const void *i, const void *val, ...);
104 void *_foreach_ptrval_next(const void *i, const void *val, ...);
105 #endif /* !HAVE_COMPOUND_LITERALS */
107 #endif /* CCAN_FOREACH_H */