zig

fork of https://codeberg.org/ziglang/zig
Log | Files | Refs | README | LICENSE

memset.zig (876B) - Raw

      1 const std = @import("std");
      2 const common = @import("./common.zig");
      3 const builtin = @import("builtin");
      4 
      5 comptime {
      6     if (builtin.object_format != .c) {
      7         @export(&memset, .{ .name = "memset", .linkage = common.linkage, .visibility = common.visibility });
      8         @export(&__memset, .{ .name = "__memset", .linkage = common.linkage, .visibility = common.visibility });
      9     }
     10 }
     11 
     12 pub fn memset(dest: ?[*]u8, c: u8, len: usize) callconv(.c) ?[*]u8 {
     13     @setRuntimeSafety(false);
     14 
     15     if (len != 0) {
     16         var d = dest.?;
     17         var n = len;
     18         while (true) {
     19             d[0] = c;
     20             n -= 1;
     21             if (n == 0) break;
     22             d += 1;
     23         }
     24     }
     25 
     26     return dest;
     27 }
     28 
     29 pub fn __memset(dest: ?[*]u8, c: u8, n: usize, dest_n: usize) callconv(.c) ?[*]u8 {
     30     if (dest_n < n)
     31         @panic("buffer overflow");
     32     return memset(dest, c, n);
     33 }