Function hasEnvVar [src]

On Windows, if key is not valid WTF-8, then error.InvalidWtf8 is returned.

Prototype

pub fn hasEnvVar(allocator: Allocator, key: []const u8) HasEnvVarError!bool

Parameters

allocator: Allocatorkey: []const u8

Possible Errors

InvalidWtf8

On Windows, environment variable keys provided by the user must be valid WTF-8. https://simonsapin.github.io/wtf-8/

OutOfMemory

Example

 test hasEnvVar {
    const has_env = try hasEnvVar(std.testing.allocator, "BADENV");
    try testing.expect(!has_env);
}

Source

  pub fn hasEnvVar(allocator: Allocator, key: []const u8) HasEnvVarError!bool {
    if (native_os == .windows) {
        var stack_alloc = std.heap.stackFallback(256 * @sizeOf(u16), allocator);
        const stack_allocator = stack_alloc.get();
        const key_w = try unicode.wtf8ToWtf16LeAllocZ(stack_allocator, key);
        defer stack_allocator.free(key_w);
        return getenvW(key_w) != null;
    } else if (native_os == .wasi and !builtin.link_libc) {
        var envmap = getEnvMap(allocator) catch return error.OutOfMemory;
        defer envmap.deinit();
        return envmap.getPtr(key) != null;
    } else {
        return posix.getenv(key) != null;
    }
}  