1 /* { dg-do preprocess } */
2 /* { dg-options "-std=gnu99" } */
3 
4 /* Jamie's varargs macros from hell.  Not for the faint of heart.
5    Great tests that C99 and GNU varargs give identical results.
6    Adapted to the testsuite by Neil Booth, 1 Nov 2000.  */
7 
8 /* Permission is granted to use, copy, modify and distribute this file
9    freely for any purpose whatsoever.  This file is free software, and
10    there's no warranty.
11 
12    -- Jamie Lokier <jamie.lokier@cern.ch>, 25/Sep/2000.  */
13 
14 #define dup3(x)            x,x,x
15 
16 /* Count elements in a list (0 to 10 max). */
17 #define gnu_count(y...)   _gnu_count1 ( , ##y)
18 #define _gnu_count1(y...) _gnu_count2 (y,10,9,8,7,6,5,4,3,2,1,0)
19 #define _gnu_count2(_,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,n,ys...) n
20 
21 /* Tail of a list. */
22 #define gnu_tail(y...)    _gnu_tail (y)
23 #define _gnu_tail(x,y...) y
24 
25 /* Repeat N times. */
26 #define gnu_repeat(n, x) gnu_tail (_gnu_repeat (n, x))
27 #define _gnu_repeat(n, x) _gnu_repeat_##n (x)
28 #define _gnu_repeat_0(x)
29 #define _gnu_repeat_1(x) ,x
30 #define _gnu_repeat_2(x) ,x,x
31 #define _gnu_repeat_3(x) ,x,x,x
32 #define _gnu_repeat_4(x) ,x,x,x,x
33 #define _gnu_repeat_5(x) ,x,x,x,x,x
34 
35 #define _gnu_keep(xs...) xs
36 #define _gnu_discard(xs...)
37 #define _gnu_split_r(n,xs...) _gnu_split_rd (n,_gnu_keep,_gnu_discard xs)
38 #define _gnu_split_d(n,xs...) _gnu_split_rd (n,_gnu_discard,_gnu_keep xs)
39 #define _gnu_split_rd(n,xs...) _gnu_split_##n (xs)
40 #define _gnu_split_0(a,b,xs...) a() b(xs)
41 #define _gnu_split_1(a,b,x0,xs...) a(x0) b(xs)
42 #define _gnu_split_2(a,b,x0,x1,xs...) a(x0,x1) b(xs)
43 #define _gnu_split_3(a,b,x0,x1,x2,xs...) a(x0,x1,x2) b(xs)
44 #define _gnu_split_4(a,b,x0,x1,x2,x3,xs...) a(x0,x1,x2,x3) b(xs)
45 #define _gnu_split_5(a,b,x0,x1,x2,x3,x4,xs...) a(x0,x1,x2,x3,x4) b(xs)
46 
47 /* List manipulations.  Surprise: index zero is the rightmost element. */
48 #define gnu_take(n, xs...) \
49   _gnu_split_d (_gnu_count1 ( , ## xs), _gnu_repeat (n, _gnu_error) , ## xs)
50 #define gnu_drop(n, xs...) \
51   _gnu_split_d (n,,_gnu_split_r  (_gnu_count1 ( , ## xs), _gnu_repeat (n, _gnu_error) , ## xs))
52 #define gnu_index(pos, xs...) gnu_take (1, gnu_drop (pos , ## xs))
53 
54 /* C99 __VA_ARGS__ versions */
55 #define c99_count(...)    _c99_count1 ( , ##__VA_ARGS__)/* If only ## worked.*/
56 #define _c99_count1(...)  _c99_count2 (__VA_ARGS__,10,9,8,7,6,5,4,3,2,1,0)
57 #define _c99_count2(_,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,n,...) n
58 
59 #define c99_tail(...)     _c99_tail (__VA_ARGS__)
60 #define _c99_tail(x,...)  __VA_ARGS__
61 
62 /* Repeat N times. */
63 #define c99_repeat(n, x) c99_tail (_c99_repeat (n, x))
64 #define _c99_repeat(n, x) _c99_repeat_##n (x)
65 #define _c99_repeat_0(x)
66 #define _c99_repeat_1(x) ,x
67 #define _c99_repeat_2(x) ,x,x
68 #define _c99_repeat_3(x) ,x,x,x
69 #define _c99_repeat_4(x) ,x,x,x,x
70 #define _c99_repeat_5(x) ,x,x,x,x,x
71 
72 #define _c99_keep(...)    __VA_ARGS__
73 #define _c99_discard(...)
74 #define _c99_split_r(n,...) _c99_split_rd(n,_c99_keep,_c99_discard __VA_ARGS__)
75 #define _c99_split_d(n,...) _c99_split_rd(n,_c99_discard,_c99_keep __VA_ARGS__)
76 #define _c99_split_rd(n,...) _c99_split_##n (__VA_ARGS__)
77 #define _c99_split_0(a,b,...) a() b(__VA_ARGS__)
78 #define _c99_split_1(a,b,x0,...) a(x0) b(__VA_ARGS__)
79 #define _c99_split_2(a,b,x0,x1,...) a(x0,x1) b(__VA_ARGS__)
80 #define _c99_split_3(a,b,x0,x1,x2,...) a(x0,x1,x2) b(__VA_ARGS__)
81 #define _c99_split_4(a,b,x0,x1,x2,x3,...) a(x0,x1,x2,x3) b(__VA_ARGS__)
82 #define _c99_split_5(a,b,x0,x1,x2,x3,x4,...) a(x0,x1,x2,x3,x4) b(__VA_ARGS__)
83 
84 /* List manipulations.  Surprise: index zero is the rightmost element. */
85 #define c99_take(n, ...) \
86   _c99_split_d (_c99_count1 ( , ## __VA_ARGS__), _c99_repeat (n, _c99_error) , ## __VA_ARGS__)
87 #define c99_drop(n, ...) \
88   _c99_split_d (n,,_c99_split_r  (_c99_count1 ( , ## __VA_ARGS__), _c99_repeat (n, _c99_error) , ## __VA_ARGS__))
89 #define c99_index(pos, ...) c99_take (1, c99_drop (pos , ## __VA_ARGS__))
90 
91 /************** Expansions **************/
92 
93 /* Correct answers are 0, 0, 1, 2, 10.  */
94 #if _gnu_count1 () != 0 || gnu_count () != 0 || gnu_count (A) != 1 \
95     || gnu_count (,) != 2 || gnu_count (A, B, C, D, E, F, G, H, I, J) != 10
96 #error gnu_count
97 #endif
98 
99 /* Correct answers are empty, 'x'.  */
100 #if gnu_repeat (0, 'x') gnu_repeat (1, 'x') != 'x'
101 #error gnu_repeat
102 #endif
103 
104 /* Correct answers are "e", "b", "a", empty.  */
105 #if gnu_index (0, 'a', 'b', 'c', 'd', 'e') != 'e' \
106  || gnu_index (3, 'a', 'b', 'c', 'd', 'e') != 'b' \
107  || gnu_index (4, 'a', 'b', 'c', 'd', 'e') != 'a' \
108     gnu_index (5, 'a', 'b', 'c', 'd', 'e')
109 #error gnu_index
110 #endif
111 
112 /************* C99 tests *************/
113 
114 /* The answers are 0, 0, 1, 2, 10 as for the non-C99 version.  */
115 #if _c99_count1 () != 0 || c99_count () != 0 || c99_count (A) != 1 \
116     || c99_count (,) != 2 || c99_count (A, B, C, D, E, F, G, H, I, J) != 10
117 #error c99_count
118 #endif
119 
120 /* Correct answers are empty, 'x'.  */
121 #if c99_repeat (0, 'x') c99_repeat (1, 'x') != 'x'
122 #error c99_repeat
123 #endif
124 
125 /* Correct answers are "e", "b", "a", empty.  */
126 #if c99_index (0, 'a', 'b', 'c', 'd', 'e') != 'e' \
127  || c99_index (3, 'a', 'b', 'c', 'd', 'e') != 'b' \
128  || c99_index (4, 'a', 'b', 'c', 'd', 'e') != 'a' \
129     c99_index (5, 'a', 'b', 'c', 'd', 'e')
130 #error gnu_index
131 #endif
132