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std.fs.path.extension: add additional API guarantee

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Added:

The returned slice is guaranteed to have its pointer
within the start and end pointer address range of `path`,
even if it is length zero.
This commit is contained in:
Andrew Kelley 2020-12-11 17:41:34 -07:00
parent 1852dc7e13
commit 52bc1442d6
1 changed files with 4 additions and 2 deletions
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6
lib/std/fs/path.zig
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@ -1201,15 +1201,17 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
/// - `"src.keep.me"` ⇒ `".me"`
/// - `"/src/keep.me"` ⇒ `".me"`
/// - `"/src/keep.me/"` ⇒ `".me"`
/// The returned slice is guaranteed to have its pointer within the start and end
/// pointer address range of `path`, even if it is length zero.
pub fn extension(path: []const u8) []const u8 {
const filename = basename(path);
return if (std.mem.lastIndexOf(u8, filename, ".")) |index|
if (index == 0 or index == filename.len - 1)
""
path[path.len..]
else
filename[index..]
else
"";
path[path.len..];
}
fn testExtension(path: []const u8, expected: []const u8) void {