how to get username cross-platform?
#how to get username cross-platform?
earnest fog
easy way: std.process.getEnvVarOwned(gpa, "USER")
will returned the associated string, which you'll need to free with gpa once you're done using it
urban heron
will this work on windows?
earnest fog
returns error.EnvironmentVariableNotFound in the event that USER isn't an environment variable
earnest fog
will this work on windows?
it has a codepath on windows so yes, though I don't recall if windows shells define USER
urban heron
what does even set $USER
earnest fog
usually the shell
most shells, at least on linux, export a bunch of posix-standard variables such as USER and HOME and so on
and usually they get that information from some source of information on the system
supple saffron
I just opened a Windows cmd prompt, and it looks like there the env var is USERNAME
urban heron
what about USER?
supple saffron
Not present
earnest fog
fair enough, so you'll probably want to either do a switch on the target os or have a fallback when the not found error returns
supple saffron
Instead of HOME, there's USERPROFILE
urban heron
const username = std.process.getEnvVarOwned(alloc, "USER") catch try std.process.getEnvVarOwned(alloc, "USERNAME");
ie
// switch on os
const user = try std.process.getEnvVarOwned(gpa, switch (@import("builtin").target.os.tag) {
.windows => "USERNAME",
else => "USER",
});
defer gpa.free(user);
// fallback in catch
const user = std.process.getEnvVarOwned(gpa, "USER") catch |err| switch (err) {
error.EnvironmentVariableNotFound => try std.process.getEnvVarOwned(gpa, "USERNAME"),
else => |e| return e,
};
defer gpa.free(user);
yah - better using comptime condition on target
earnest fog
note: it doesn't only return environmentvariablenotfound, it can also return OutOfMemory and InvalidWtf8
so using a catch-all catch is not too prudent
supple saffron
I don;t recall it exactly, but on Widnows there's an API to call that is not dependent on an environment variable.
urban heron
note: it doesn't *only* return environmentvariablenotfound, it can also return O...
but then the second one will fail with the same reason
urban heron
ok but does it really matter
earnest fog
yeah
you don't want to try again if the reason you failed is due to failing due to out of memory or invalid environment
urban heron
the zig standard library browser is really nice
supple saffron
Windows: GetUserNameExW probably better
urban heron
W for win
i can probably rely on USERNAME being defined on Windows more than USER being defined on posix OSes
supple saffron
No, it's for the Unicode version, which you want in case the user's name uses characters that aren't in the system codepage.
urban heron
i know i was
supple saffron
There's also GetUserNameW
urban heron
pub const HOST_NAME_MAX = switch (native_os) {
.linux => linux.HOST_NAME_MAX,
.macos, .ios, .tvos, .watchos, .visionos => 72,
.openbsd, .haiku, .dragonfly, .netbsd, .solaris, .illumos, .freebsd => 255,
// https://github.com/SerenityOS/serenity/blob/c87557e9c1865fa1a6440de34ff6ce6fc858a2b7/Kernel/API/POSIX/sys/limits.h#L22
.serenity => 64,
else => {},
};
this will be what on windows?
supple saffron
Aren't length of host names established by IETF?
Yes, it's RFC1035: https://datatracker.ietf.org/doc/html/rfc1035
urban heron
thats from stdlib