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core: Add str::from_c_str, from_c_str_len, as_c_str

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This commit is contained in:
Brian Anderson 2012-03-14 14:22:56 -07:00
parent 3a2df84d89
commit e5dea87f43
1 changed files with 30 additions and 5 deletions
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35
src/libcore/str.rs
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@ -11,14 +11,21 @@ export
// Creating a string // Creating a string
from_bytes, from_bytes,
from_byte, from_byte,
push_char,
from_char, from_char,
from_chars, from_chars,
from_buf, from_buf,
from_buf_len, from_buf_len,
from_c_str,
from_c_str_len,
push_char,
concat, concat,
connect, connect,
// Reinterpretation
as_bytes,
as_buf,
as_c_str,
// Adding things to and removing things from a string // Adding things to and removing things from a string
push_char, push_char,
pop_char, pop_char,
@ -88,8 +95,6 @@ export
char_range_at, char_range_at,
is_char_boundary, is_char_boundary,
char_at, char_at,
as_bytes,
as_buf,
reserve, reserve,
unsafe; unsafe;
@ -192,6 +197,11 @@ fn from_buf(buf: *u8) -> str unsafe {
ret from_buf_len(buf, i); ret from_buf_len(buf, i);
} }
#[doc = "Create a Rust string from a null-terminated C string"]
fn from_c_str(c_str: *libc::c_char) -> str unsafe {
from_buf(::unsafe::reinterpret_cast(c_str))
}
#[doc = "Create a Rust string from a *u8 buffer of the given length"] #[doc = "Create a Rust string from a *u8 buffer of the given length"]
fn from_buf_len(buf: *u8, len: uint) -> str unsafe { fn from_buf_len(buf: *u8, len: uint) -> str unsafe {
let mut v: [u8] = []; let mut v: [u8] = [];
@ -206,6 +216,11 @@ fn from_buf_len(buf: *u8, len: uint) -> str unsafe {
ret s; ret s;
} }
#[doc = "Create a Rust string from a `*c_char` buffer of the given length"]
fn from_c_str_len(c_str: *libc::c_char, len: uint) -> str unsafe {
from_buf_len(::unsafe::reinterpret_cast(c_str), len)
}
#[doc = "Concatenate a vector of strings"] #[doc = "Concatenate a vector of strings"]
fn concat(v: [str]) -> str { fn concat(v: [str]) -> str {
let mut s: str = ""; let mut s: str = "";
@ -1240,6 +1255,16 @@ Work with the byte buffer of a string.
Allows for unsafe manipulation of strings, which is useful for native Allows for unsafe manipulation of strings, which is useful for native
interop. interop.
"]
fn as_buf<T>(s: str, f: fn(*u8) -> T) -> T unsafe {
as_bytes(s) { |v| vec::as_buf(v, f) }
}
#[doc = "
Work with the byte buffer of a string as a null-terminated C string.
Allows for unsafe manipulation of strings, which is useful for native
interop, without copying the original string.
# Example # Example
@ -1247,8 +1272,8 @@ interop.
let s = str::as_buf(\"PATH\", { |path_buf| libc::getenv(path_buf) }); let s = str::as_buf(\"PATH\", { |path_buf| libc::getenv(path_buf) });
``` ```
"] "]
fn as_buf<T>(s: str, f: fn(*u8) -> T) -> T unsafe { fn as_c_str<T>(s: str, f: fn(*libc::c_char) -> T) -> T unsafe {
as_bytes(s) { |v| vec::as_buf(v, f) } as_buf(s) {|buf| f(buf as *libc::c_char) }
} }
#[doc = "Allocate more memory for a string, up to `nn` + 1 bytes"] #[doc = "Allocate more memory for a string, up to `nn` + 1 bytes"]