1 // Copyright 2015 Brian Smith. 2 // 3 // Permission to use, copy, modify, and/or distribute this software for any 4 // purpose with or without fee is hereby granted, provided that the above 5 // copyright notice and this permission notice appear in all copies. 6 // 7 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES 8 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 10 // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12 // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13 // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 15 use crate::{c, error}; 16 17 /// An `int` returned from a foreign function containing **1** if the function 18 /// was successful or **0** if an error occurred. This is the convention used by 19 /// C code in `ring`. 20 #[derive(Clone, Copy, Debug)] 21 #[must_use] 22 #[repr(transparent)] 23 pub struct Result(c::int); 24 25 impl From<Result> for core::result::Result<(), error::Unspecified> { from(ret: Result) -> Self26 fn from(ret: Result) -> Self { 27 match ret.0 { 28 1 => Ok(()), 29 c => { 30 debug_assert_eq!(c, 0, "`bssl::Result` value must be 0 or 1"); 31 Err(error::Unspecified) 32 } 33 } 34 } 35 } 36 37 #[cfg(test)] 38 mod tests { 39 mod result { 40 use crate::{bssl, c}; 41 use core::mem; 42 43 #[test] size_and_alignment()44 fn size_and_alignment() { 45 type Underlying = c::int; 46 assert_eq!(mem::size_of::<bssl::Result>(), mem::size_of::<Underlying>()); 47 assert_eq!( 48 mem::align_of::<bssl::Result>(), 49 mem::align_of::<Underlying>() 50 ); 51 } 52 53 #[test] semantics()54 fn semantics() { 55 assert!(Result::from(bssl::Result(0)).is_err()); 56 assert!(Result::from(bssl::Result(1)).is_ok()); 57 } 58 } 59 } 60