This type of need arises from the following facts
Posted: Tue Dec 10, 2024 4:07 am
It is also possible to obtain a &[u8] slice from a CString using the CString::as_bytes method. A slice generated in this way does not include a trailing nul terminator. This is useful when calling an external function that takes a *const u8 argument that does not necessarily end in nul, plus another argument for the length of the string, such as C's strndup(). Of course, you can get the length of the slice using the len method.
If you want to get a nul-terminated &[u8] slice, you can use the CString::as_bytes_with_nul method.
Whether you get a slice that ends with or without a nul terminator, you albania whatsapp number data 5 million can call the slice's as_ptr method to get a read-only raw pointer to pass to an external function. For a discussion on how to ensure the lifetime of a raw pointer, see the documentation for that function.
OsString and &OsStr
OsString is a string type that can represent its own, mutable platform-native strings, but can be converted to and from Rust strings cheaply.
On Unix systems, strings are usually arbitrary sequences of non-zero bytes, interpreted as UTF-8 in many cases.
On Windows, a string is typically any sequence of non-zero 16-bit values, interpreted as UTF-16 when valid.
In Rust, strings are always valid UTF-8, which may contain zeros.
OsString and [OsStr] bridge this gap by representing both Rust and platform-native string values, and in particular by allowing Rust strings to be converted to "OS" strings where possible. A consequence of this is that OsString instances are not NUL-terminated; for passing to e.g. Unix system calls, you should create a CStr instead.
The relationship between OsString and &OsStr is the same as the relationship between String and &str: the first string in each pair is the owned string; the second is the borrowed reference data.
Note that OsString and [OsStr] do not necessarily store strings in a platform-native form !
On Unix, strings are stored as a sequence of 8-bit values, while on Windows, strings are based on 16-bit values, and as discussed earlier, strings are actually stored as a sequence of 8-bit values, encoded in a less strict variant of UTF-8. This helps to understand when dealing with capacity and length values.
If you want to get a nul-terminated &[u8] slice, you can use the CString::as_bytes_with_nul method.
Whether you get a slice that ends with or without a nul terminator, you albania whatsapp number data 5 million can call the slice's as_ptr method to get a read-only raw pointer to pass to an external function. For a discussion on how to ensure the lifetime of a raw pointer, see the documentation for that function.
OsString and &OsStr
OsString is a string type that can represent its own, mutable platform-native strings, but can be converted to and from Rust strings cheaply.
On Unix systems, strings are usually arbitrary sequences of non-zero bytes, interpreted as UTF-8 in many cases.
On Windows, a string is typically any sequence of non-zero 16-bit values, interpreted as UTF-16 when valid.
In Rust, strings are always valid UTF-8, which may contain zeros.
OsString and [OsStr] bridge this gap by representing both Rust and platform-native string values, and in particular by allowing Rust strings to be converted to "OS" strings where possible. A consequence of this is that OsString instances are not NUL-terminated; for passing to e.g. Unix system calls, you should create a CStr instead.
The relationship between OsString and &OsStr is the same as the relationship between String and &str: the first string in each pair is the owned string; the second is the borrowed reference data.
Note that OsString and [OsStr] do not necessarily store strings in a platform-native form !
On Unix, strings are stored as a sequence of 8-bit values, while on Windows, strings are based on 16-bit values, and as discussed earlier, strings are actually stored as a sequence of 8-bit values, encoded in a less strict variant of UTF-8. This helps to understand when dealing with capacity and length values.