authorgravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2018-04-10 22:24:01-04:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2018-04-10 22:24:01-04:00
logf6c77746d6be1bb238bf632f74c6dfc28de034ed
tree5b79f1222e640dbf207eaa55e8ae4476fccbb010
parent27e881c2d7bebbf06b9932559ff2677ed8b6088b

add memmove to builtin.o

related: #514

1 files changed, 25 insertions(+), 8 deletions(-)

std/special/builtin.zig+25-8
...@@ -14,26 +14,43 @@ pub fn panic(msg: []const u8, error_return_trace: ?&builtin.StackTrace) noreturn...@@ -14,26 +14,43 @@ pub fn panic(msg: []const u8, error_return_trace: ?&builtin.StackTrace) noreturn
14 }14 }
15}15}
1616
17// Note that memset does not return `dest`, like the libc API.17export fn memset(dest: ?&u8, c: u8, n: usize) ?&u8 {
18// The semantics of memset is dictated by the corresponding
19// LLVM intrinsics, not by the libc API.
20export fn memset(dest: ?&u8, c: u8, n: usize) void {
21 @setRuntimeSafety(false);18 @setRuntimeSafety(false);
2219
23 var index: usize = 0;20 var index: usize = 0;
24 while (index != n) : (index += 1)21 while (index != n) : (index += 1)
25 (??dest)[index] = c;22 (??dest)[index] = c;
23
24 return dest;
26}25}
2726
28// Note that memcpy does not return `dest`, like the libc API.27export fn memcpy(noalias dest: ?&u8, noalias src: ?&const u8, n: usize) ?&u8 {
29// The semantics of memcpy is dictated by the corresponding
30// LLVM intrinsics, not by the libc API.
31export fn memcpy(noalias dest: ?&u8, noalias src: ?&const u8, n: usize) void {
32 @setRuntimeSafety(false);28 @setRuntimeSafety(false);
3329
34 var index: usize = 0;30 var index: usize = 0;
35 while (index != n) : (index += 1)31 while (index != n) : (index += 1)
36 (??dest)[index] = (??src)[index];32 (??dest)[index] = (??src)[index];
33
34 return dest;
35}
36
37export fn memmove(dest: ?&u8, src: ?&const u8, n: usize) ?&u8 {
38 @setRuntimeSafety(false);
39
40 if (@ptrToInt(dest) < @ptrToInt(src)) {
41 var index: usize = 0;
42 while (index != n) : (index += 1) {
43 (??dest)[index] = (??src)[index];
44 }
45 } else {
46 var index = n;
47 while (index != 0) {
48 index -= 1;
49 (??dest)[index] = (??src)[index];
50 }
51 }
52
53 return dest;
37}54}
3855
39comptime {56comptime {