Commit ece8480fc2190229721bf1690116fa6d767f4c0e | zig

author	Eric Joldasov <bratishkaerik@landless-city.net> 2024-07-16 00:27:56+05:00
committer	Eric Joldasov <bratishkaerik@landless-city.net> 2024-07-16 00:27:56+05:00
log	ece8480fc2190229721bf1690116fa6d767f4c0e
tree	b04fcc80ff69707eb191db638d53dcccd99051e5
parent	888708ec8af9b60681ef14fb0a5c265f2a30b41f
signature	Commit is signed but in an unrecognized format.

std.c.setlocale: fix return type to nullable pointer

According to https://en.cppreference.com/mwiki/index.php?title=c/locale/setlocale&oldid=171500 ,
`setlocale` "returns null value on failure":

> Return value
> pointer to a narrow null-terminated string identifying the C locale
> after applying the changes, if any, or null pointer on failure.

Example program:
```zig
const std = @import("std");

pub fn main() void {
    const ptr = std.c.setlocale(.ALL, "non_existent");
    std.debug.print("ptr = {d}\n", .{@intFromPtr(ptr)});
}
```

Output:
```console
ptr = 0
```

Signed-off-by: Eric Joldasov <bratishkaerik@landless-city.net>

1 files changed, 1 insertions(+), 1 deletions(-)

lib
- std
  - c.zig

lib/std/c.zig+1-1

...	...	@@ -1914,7 +1914,7 @@ pub const LC = enum(c_int) {
1914	1914	IDENTIFICATION = 12,
1915	1915	};
1916	1916
1917		pub extern "c" fn setlocale(category: LC, locale: ?[:0]const u8) [:0]const u8;
	1917	pub extern "c" fn setlocale(category: LC, locale: ?[:0]const u8) ?[:0]const u8;
1918	1918
1919	1919	pub const getcontext = if (builtin.target.isAndroid())
1920	1920	@compileError("android bionic libc does not implement getcontext")