From 2c241b263cf165cdde4b3b1df3ce551d915ee476 Mon Sep 17 00:00:00 2001 From: David Date: Sat, 10 May 2025 10:37:21 +0200 Subject: Introduce common `bzero` libc implementation. (#23812) * Introduce common `bzero` libc implementation. * Update test name according to review Co-authored-by: Linus Groh * address code review - import common implementation when musl or wasi is included - don't use `c_builtins`, use `@memset` * bzero calling conv to .c * Apply review Co-authored-by: Veikka Tuominen --------- Co-authored-by: Linus Groh Co-authored-by: Veikka Tuominen --- lib/c/strings.zig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 lib/c/strings.zig (limited to 'lib/c') diff --git a/lib/c/strings.zig b/lib/c/strings.zig new file mode 100644 index 0000000000..30e945e7b1 --- /dev/null +++ b/lib/c/strings.zig @@ -0,0 +1,19 @@ +const std = @import("std"); +const common = @import("common.zig"); + +comptime { + @export(&bzero, .{ .name = "bzero", .linkage = common.linkage, .visibility = common.visibility }); +} + +fn bzero(s: *anyopaque, n: usize) callconv(.c) void { + const s_cast: [*]u8 = @ptrCast(s); + @memset(s_cast[0..n], 0); +} + +test bzero { + var array: [10]u8 = [_]u8{ '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' }; + var a = std.mem.zeroes([array.len]u8); + a[9] = '0'; + bzero(&array[0], 9); + try std.testing.expect(std.mem.eql(u8, &array, &a)); +} -- cgit v1.2.3