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std: Fix cast that's sometimes invalid

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This commit is contained in:
LemonBoy 2021-05-07 11:33:48 +02:00
parent 93f48189f1
commit f4a05286d3
2 changed files with 8 additions and 3 deletions
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4
lib/std/c/linux.zig
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@ -61,11 +61,11 @@ pub const EAI = extern enum(c_int) {
_,
};
pub extern "c" fn fallocate64(fd: fd_t, mode: c_int, offset: i64, len: i64) c_int;
pub extern "c" fn fallocate64(fd: fd_t, mode: c_int, offset: off_t, len: off_t) c_int;
pub extern "c" fn fopen64(noalias filename: [*:0]const u8, noalias modes: [*:0]const u8) ?*FILE;
pub extern "c" fn fstat64(fd: fd_t, buf: *libc_stat) c_int;
pub extern "c" fn fstatat64(dirfd: fd_t, path: [*:0]const u8, stat_buf: *libc_stat, flags: u32) c_int;
pub extern "c" fn ftruncate64(fd: c_int, length: i64) c_int;
pub extern "c" fn ftruncate64(fd: c_int, length: off_t) c_int;
pub extern "c" fn getrlimit64(resource: rlimit_resource, rlim: *rlimit) c_int;
pub extern "c" fn lseek64(fd: fd_t, offset: u64, whence: c_int) u64;
pub extern "c" fn mmap64(addr: ?*align(std.mem.page_size) c_void, len: usize, prot: c_uint, flags: c_uint, fd: fd_t, offset: u64) *c_void;

7
lib/std/os.zig
View File

@ -577,7 +577,12 @@ pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
else
system.ftruncate;
switch (errno(ftruncate_sym(fd, @bitCast(off_t, length)))) {
// XXX Pick a side and avoid this cast madness.
const casted_length = if (builtin.link_libc)
@bitCast(off_t, length)
else
length;
switch (errno(ftruncate_sym(fd, casted_length))) {
0 => return,
EINTR => continue,
EFBIG => return error.FileTooBig,