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mem foreign functions call the native ones

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this reduces the amount of implementation to change for #1835
This commit is contained in:
Josh Wolfe 2018-12-16 11:14:53 -05:00
parent 624c74af6f
commit 7533d1b14c
1 changed files with 3 additions and 7 deletions
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10
std/mem.zig
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@ -443,8 +443,7 @@ pub fn readIntNative(comptime T: type, bytes: *const [@sizeOf(T)]u8) T {
/// This function cannot fail and cannot cause undefined behavior.
/// Assumes the endianness of memory is foreign, so it must byte-swap.
pub fn readIntForeign(comptime T: type, bytes: *const [@sizeOf(T)]u8) T {
comptime assert(T.bit_count % 8 == 0);
return @bswap(T, @ptrCast(*align(1) const T, bytes).*);
return @bswap(T, readIntNative(T, bytes));
}
pub const readIntLittle = switch (builtin.endian) {
@ -476,10 +475,7 @@ pub fn readIntSliceNative(comptime T: type, bytes: []const u8) T {
/// The bit count of T must be evenly divisible by 8.
/// Assumes the endianness of memory is foreign, so it must byte-swap.
pub fn readIntSliceForeign(comptime T: type, bytes: []const u8) T {
assert(@sizeOf(u24) == 3);
assert(bytes.len >= @sizeOf(T));
// TODO https://github.com/ziglang/zig/issues/863
return readIntForeign(T, @ptrCast(*const [@sizeOf(T)]u8, bytes.ptr));
return @bswap(T, readIntSliceNative(T, bytes));
}
pub const readIntSliceLittle = switch (builtin.endian) {
@ -548,7 +544,7 @@ pub fn writeIntNative(comptime T: type, buf: *[@sizeOf(T)]u8, value: T) void {
/// the integer bit width must be divisible by 8.
/// This function stores in foreign endian, which means it does a @bswap first.
pub fn writeIntForeign(comptime T: type, buf: *[@sizeOf(T)]u8, value: T) void {
@ptrCast(*align(1) T, buf).* = @bswap(T, value);
writeIntNative(T, buf, @bswap(T, value));
}
pub const writeIntLittle = switch (builtin.endian) {