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try 'write' that works on mac, but I didn't know if it works on windows

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This commit is contained in:
Chris Boesch 2023-02-16 18:33:06 +01:00
parent dce731a0ec
commit bb95625477
2 changed files with 8 additions and 18 deletions
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20
exercises/093_hello_c.zig
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@ -42,29 +42,19 @@ const std = @import("std");
// new the import for C // new the import for C
const c = @cImport({ const c = @cImport({
@cInclude("unistd.h");
// we use "standard input/output" from C
@cInclude("stdio.h");
}); });
pub fn main() void { pub fn main() void {
// Due to a current limitation in the Zig compiler,
// we need a small workaround to make this exercise
// work on mac-os.
const builtin = @import("builtin");
const stderr = switch (builtin.target.os.tag) {
.macos => 1,
else => c.stderr,
};
// In order to output a text that can be evaluated by the // In order to output a text that can be evaluated by the
// Zig Builder, we need to write it to the Error output. // Zig Builder, we need to write it to the Error output.
// In Zig we do this with "std.debug.print" and in C we can // In Zig we do this with "std.debug.print" and in C we can
// specify the file to write to, i.e. "standard error (stderr)". // specify the file descriptor i.e. 2 for error console.
// //
// Ups, something is wrong... // In this case we use 'write' to output 17 chars,
const c_res = fprintf(stderr, "Hello C from Zig!"); // but something is missing...
const c_res = write(2, "Hello C from Zig!", 17);
// let's see what the result from C is: // let's see what the result from C is:
std.debug.print(" - C result ist {d} chars\n", .{c_res}); std.debug.print(" - C result ist {d} chars\n", .{c_res});

6
patches/patches/093_hello_c.patch
View file

@ -1,4 +1,4 @@
63c63 57c57
< const c_res = fprintf(stderr, "Hello C from Zig!"); < const c_res = write(2, "Hello C from Zig!", 17);
--- ---
> const c_res = c.fprintf(stderr, "Hello C from Zig!"); > const c_res = c.write(2, "Hello C from Zig!", 17);