50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
pub mod c {
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use std::ffi::{ CStr, CString };
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use std::os::raw::c_char;
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use std::str::Utf8Error;
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pub fn as_str(s: &*const c_char) -> Result<Option<&str>, Utf8Error> {
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if s.is_null() {
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Ok(None)
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} else {
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unsafe {CStr::from_ptr(*s)}
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.to_str()
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.map(Some)
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}
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}
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pub fn as_cstr(s: &*const c_char) -> Option<&CStr> {
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if s.is_null() {
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None
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} else {
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Some(unsafe {CStr::from_ptr(*s)})
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}
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}
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pub fn into_cstring(s: *const c_char) -> Result<Option<CString>, std::ffi::NulError> {
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if s.is_null() {
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Ok(None)
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} else {
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CString::new(
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unsafe {CStr::from_ptr(s)}.to_bytes()
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).map(Some)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::ptr;
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#[test]
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fn test_null_cstring() {
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assert_eq!(into_cstring(ptr::null()), Ok(None))
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}
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#[test]
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fn test_null_str() {
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assert_eq!(as_str(&ptr::null()), Ok(None))
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}
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}
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}
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