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make std.os.getenvW case insensitive

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partially addresses #4603

Fixing std.process.getEnvMap is NOT included in this commit.
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Ilmari Autio 2020-03-02 23:15:36 +02:00 committed by Andrew Kelley
parent 503c420797
commit ba1a8b64c4
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1 changed files with 15 additions and 1 deletions
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16
lib/std/os.zig
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@ -21,6 +21,7 @@ const assert = std.debug.assert;
const math = std.math;
const mem = std.mem;
const elf = std.elf;
const unicode = std.unicode;
const dl = @import("dynamic_library.zig");
const MAX_PATH_BYTES = std.fs.MAX_PATH_BYTES;
@ -1206,6 +1207,19 @@ pub fn getenvZ(key: [*:0]const u8) ?[]const u8 {
return getenv(mem.spanZ(key));
}
fn utf16LeAsciiEqlIgnoreCase(a: []const u16, b: []const u16) bool {
if (a.len != b.len) return false;
var a_it = unicode.Utf16LeIterator.init(a);
var b_it = unicode.Utf16LeIterator.init(b);
while (a_it.nextCodepoint() catch return false) |a_codepoint| {
const b_codepoint = (b_it.nextCodepoint() catch return false) orelse return false;
const upper_a = if (a_codepoint >= 97 and a_codepoint <= 122) a_codepoint & 0b11011111 else a_codepoint;
const upper_b = if (b_codepoint >= 97 and b_codepoint <= 122) b_codepoint & 0b11011111 else b_codepoint;
if (upper_a != upper_b) return false;
}
return true;
}
/// Windows-only. Get an environment variable with a null-terminated, WTF-16 encoded name.
/// See also `getenv`.
pub fn getenvW(key: [*:0]const u16) ?[:0]const u16 {
@ -1227,7 +1241,7 @@ pub fn getenvW(key: [*:0]const u16) ?[:0]const u16 {
while (ptr[i] != 0) : (i += 1) {}
const this_value = ptr[value_start..i :0];
if (mem.eql(u16, key_slice, this_key)) return this_value;
if (utf16LeAsciiEqlIgnoreCase(key_slice, this_key)) return this_value;
i += 1; // skip over null byte
}