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std.fs: Add MAX_NAME_BYTES

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Also add some NAME_MAX or equivalent definitions where necessary
This commit is contained in:
Ryan Liptak 2022-10-13 22:18:35 -07:00
parent e036cc48d5
commit 33fdc43714
5 changed files with 27 additions and 0 deletions
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1
lib/std/c/darwin.zig
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@ -1014,6 +1014,7 @@ pub const vm_machine_attribute_val_t = isize;
pub const CALENDAR_CLOCK = 1;
pub const PATH_MAX = 1024;
pub const NAME_MAX = 255;
pub const IOV_MAX = 16;
pub const STDIN_FILENO = 0;

1
lib/std/c/dragonfly.zig
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@ -234,6 +234,7 @@ pub const SA = struct {
};
pub const PATH_MAX = 1024;
pub const NAME_MAX = 255;
pub const IOV_MAX = KERN.IOV_MAX;
pub const ino_t = c_ulong;

2
lib/std/c/haiku.zig
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@ -266,6 +266,7 @@ pub const area_info = extern struct {
};
pub const MAXPATHLEN = PATH_MAX;
pub const MAXNAMLEN = NAME_MAX;
pub const image_info = extern struct {
id: u32,
@ -371,6 +372,7 @@ pub const KERN = struct {};
pub const IOV_MAX = 1024;
pub const PATH_MAX = 1024;
pub const NAME_MAX = 256;
pub const STDIN_FILENO = 0;
pub const STDOUT_FILENO = 1;

17
lib/std/fs.zig
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@ -48,6 +48,23 @@ pub const MAX_PATH_BYTES = switch (builtin.os.tag) {
@compileError("PATH_MAX not implemented for " ++ @tagName(builtin.os.tag)),
};
/// This represents the maximum size of a UTF-8 encoded file name component that the
/// operating system will accept. All file name components returned by file system
/// operations are assumed to fit into a UTF-8 encoded array of this length.
/// The byte count does not include a null sentinel byte.
pub const MAX_NAME_BYTES = switch (builtin.os.tag) {
.linux, .macos, .ios, .freebsd, .dragonfly, .haiku => os.NAME_MAX,
.netbsd, .openbsd, .solaris => os.MAXNAMLEN,
// Each UTF-16LE character may be expanded to 3 UTF-8 bytes.
// If it would require 4 UTF-8 bytes, then there would be a surrogate
// pair in the UTF-16LE, and we (over)account 3 bytes for it that way.
.windows => os.NAME_MAX * 3,
else => if (@hasDecl(root, "os") and @hasDecl(root.os, "NAME_MAX"))
root.os.NAME_MAX
else
@compileError("NAME_MAX not implemented for " ++ @tagName(builtin.os.tag)),
};
pub const base64_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".*;
/// Base64 encoder, replacing the standard `+/` with `-_` so that it can be used in a file name on any filesystem.

6
lib/std/os/windows.zig
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@ -2977,6 +2977,12 @@ pub const PMEMORY_BASIC_INFORMATION = *MEMORY_BASIC_INFORMATION;
/// from https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation
pub const PATH_MAX_WIDE = 32767;
/// > [Each file name component can be] up to the value returned in the
/// > lpMaximumComponentLength parameter of the GetVolumeInformation function
/// > (this value is commonly 255 characters)
/// from https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
pub const NAME_MAX = 255;
pub const FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;
pub const FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000;
pub const FORMAT_MESSAGE_FROM_HMODULE = 0x00000800;