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Make std.os.getenv always a compile error on Windows

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The _environ variable that is populated when linking libc on Windows does not support Unicode keys/values (or, at least, the encoding is not necessarily UTF-8). So, for Unicode support, _wenviron would need to be used instead. However, this means that the keys/values would be encoded as UTF-16, so they would need to be converted to UTF-8 before being returned by `os.getenv`. This would require allocation which is not part of the `os.getenv` API, so `os.getenv` is not implementable on Windows even when linking libc.

Closes https://github.com/ziglang/zig/issues/8456
This commit is contained in:
Ryan Liptak 2023-09-17 02:13:14 -07:00 • committed by Andrew Kelley
parent c1e94b28a3
commit bc626e8b89
1 changed files with 4 additions and 3 deletions
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7
lib/std/os.zig
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@ -1893,6 +1893,9 @@ pub fn execvpeZ(
/// Get an environment variable. /// Get an environment variable.
/// See also `getenvZ`. /// See also `getenvZ`.
pub fn getenv(key: []const u8) ?[:0]const u8 { pub fn getenv(key: []const u8) ?[:0]const u8 {
if (builtin.os.tag == .windows) {
@compileError("std.os.getenv is unavailable for Windows because environment strings are in WTF-16 format. See std.process.getEnvVarOwned for a cross-platform API or std.os.getenvW for a Windows-specific API.");
}
if (builtin.link_libc) { if (builtin.link_libc) {
var ptr = std.c.environ; var ptr = std.c.environ;
while (ptr[0]) |line| : (ptr += 1) { while (ptr[0]) |line| : (ptr += 1) {
@ -1906,9 +1909,7 @@ pub fn getenv(key: []const u8) ?[:0]const u8 {
} }
return null; return null;
} }
if (builtin.os.tag == .windows) { if (builtin.os.tag == .wasi) {
@compileError("std.os.getenv is unavailable for Windows because environment string is in WTF-16 format. See std.process.getEnvVarOwned for cross-platform API or std.os.getenvW for Windows-specific API.");
} else if (builtin.os.tag == .wasi) {
@compileError("std.os.getenv is unavailable for WASI. See std.process.getEnvMap or std.process.getEnvVarOwned for a cross-platform API."); @compileError("std.os.getenv is unavailable for WASI. See std.process.getEnvMap or std.process.getEnvVarOwned for a cross-platform API.");
} }
// The simplified start logic doesn't populate environ. // The simplified start logic doesn't populate environ.