add tools::parse submodule, move hex_nibble to it

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-sys/src/linux/procfs.rs

@@ -9,6 +9,7 @@ use lazy_static::lazy_static;
 use libc;
 
 use proxmox_tools::fs::file_read_firstline;
+use proxmox_tools::parse::hex_nibble;
 
 /// POSIX sysconf call
 pub fn sysconf(name: i32) -> i64 {
@@ -325,15 +326,6 @@ pub fn read_proc_net_dev() -> Result<Vec<ProcFsNetDev>, Error> {
     Ok(result)
 }
 
-fn hex_nibble(c: u8) -> Result<u8, Error> {
-    Ok(match c {
-        b'0'..=b'9' => c - b'0',
-        b'a'..=b'f' => c - b'a' + 0xa,
-        b'A'..=b'F' => c - b'A' + 0xa,
-        _ => bail!("not a hex digit: {}", c as char),
-    })
-}
-
 fn hexstr_to_ipv4addr<T: AsRef<[u8]>>(hex: T) -> Result<Ipv4Addr, Error> {
     let hex = hex.as_ref();
     if hex.len() != 8 {

proxmox-tools/src/lib.rs

@@ -8,6 +8,7 @@ pub mod common_regex;
 pub mod fd;
 pub mod fs;
 pub mod io;
+pub mod parse;
 pub mod serde;
 pub mod uuid;
 pub mod vec;

proxmox-tools/src/parse.rs

@@ -0,0 +1,14 @@
+//! Some parsing utilities.
+
+use failure::{bail, Error};
+
+/// Parse a hexadecimal digit into a byte.
+#[inline]
+pub fn hex_nibble(c: u8) -> Result<u8, Error> {
+    Ok(match c {
+        b'0'..=b'9' => c - b'0',
+        b'a'..=b'f' => c - b'a' + 0xa,
+        b'A'..=b'F' => c - b'A' + 0xa,
+        _ => bail!("not a hex digit: {}", c as char),
+    })
+}