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Merge pull request #34 from rust-embedded-community/strspn
Add strspn
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| //! Rust implementation of C library function `strcspn` | ||
| //! | ||
| //! Copyright (c) Ferrous Systems UK Ltd | ||
| //! Licensed under the Blue Oak Model Licence 1.0.0 | ||
| use crate::{CChar, CInt}; | ||
|
|
||
| /// Rust implementation of C library function `strcspn` | ||
| #[cfg_attr(feature = "strcspn", no_mangle)] | ||
| pub unsafe extern "C" fn strcspn(s: *const CChar, charset: *const CChar) -> usize { | ||
| if s.is_null() { | ||
| return 0; | ||
| } | ||
| if charset.is_null() { | ||
| return 0; | ||
| } | ||
|
|
||
| let s = unsafe { core::ffi::CStr::from_ptr(s.cast()) }; | ||
|
|
||
| let charset = unsafe { core::ffi::CStr::from_ptr(charset.cast()) }; | ||
|
|
||
| let bytes = s.to_bytes(); | ||
| for (idx, b) in bytes.iter().enumerate() { | ||
| if is_c_in_charset(*b, charset) { | ||
| return idx; | ||
| } | ||
| } | ||
|
|
||
| bytes.len() | ||
| } | ||
|
|
||
| fn is_c_in_charset(c: u8, charset: &core::ffi::CStr) -> bool { | ||
| for b in charset.to_bytes() { | ||
| if c == *b { | ||
| return true; | ||
| } | ||
| } | ||
| false | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| #[test] | ||
| fn complete() { | ||
| let charset = c"0123456789"; | ||
| let s = c"abcdef"; | ||
| assert_eq!( | ||
| unsafe { super::strcspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 6 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn subset() { | ||
| let charset = c"0123456789"; | ||
| let s = c"xyz1"; | ||
| assert_eq!( | ||
| unsafe { super::strcspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 3 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn none() { | ||
| let charset = c"0123456789"; | ||
| let s = c"567"; | ||
| assert_eq!( | ||
| unsafe { super::strcspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 0 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn empty_charset() { | ||
| let charset = c""; | ||
| let s = c"AABBCCDD"; | ||
| assert_eq!( | ||
| unsafe { super::strcspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 8 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn empty_string() { | ||
| let charset = c"0123456789"; | ||
| let s = c""; | ||
| assert_eq!( | ||
| unsafe { super::strcspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 0 | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| // End of file |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| //! Rust implementation of C library function `strspn` | ||
| //! | ||
| //! Copyright (c) Ferrous Systems UK Ltd | ||
| //! Licensed under the Blue Oak Model Licence 1.0.0 | ||
| use crate::{CChar, CInt}; | ||
|
|
||
| /// Rust implementation of C library function `strspn` | ||
| #[cfg_attr(feature = "strspn", no_mangle)] | ||
| pub unsafe extern "C" fn strspn(s: *const CChar, charset: *const CChar) -> usize { | ||
| if s.is_null() { | ||
| return 0; | ||
| } | ||
| if charset.is_null() { | ||
| return 0; | ||
| } | ||
|
|
||
| let s = unsafe { core::ffi::CStr::from_ptr(s.cast()) }; | ||
|
|
||
| let charset = unsafe { core::ffi::CStr::from_ptr(charset.cast()) }; | ||
|
|
||
| let bytes = s.to_bytes(); | ||
| for (idx, b) in bytes.iter().enumerate() { | ||
| if !is_c_in_charset(*b, charset) { | ||
| return idx; | ||
| } | ||
| } | ||
|
|
||
| bytes.len() | ||
| } | ||
|
|
||
| fn is_c_in_charset(c: u8, charset: &core::ffi::CStr) -> bool { | ||
| for b in charset.to_bytes() { | ||
| if c == *b { | ||
| return true; | ||
| } | ||
| } | ||
| false | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| #[test] | ||
| fn complete() { | ||
| let charset = c"0123456789"; | ||
| let s = c"987654321"; | ||
| assert_eq!( | ||
| unsafe { super::strspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 9 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn subset() { | ||
| let charset = c"0123456789"; | ||
| let s = c"98xx7654321"; | ||
| assert_eq!( | ||
| unsafe { super::strspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 2 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn empty_charset() { | ||
| let charset = c""; | ||
| let s = c"AABBCCDD"; | ||
| assert_eq!( | ||
| unsafe { super::strspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 0 | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn empty_string() { | ||
| let charset = c"0123456789"; | ||
| let s = c""; | ||
| assert_eq!( | ||
| unsafe { super::strspn(s.as_ptr().cast(), charset.as_ptr().cast()) }, | ||
| 0 | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| // End of file |