Implement split instead of using heavy regex

Cargo.lock

@@ -531,7 +531,6 @@ dependencies = [
  "log",
  "multiboot2",
  "pod",
- "regex",
  "spin 0.9.8",
  "trapframe",
  "volatile",
@@ -980,31 +979,6 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
-[[package]]
-name = "regex"
-version = "1.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2eae68fc220f7cf2532e4494aded17545fce192d59cd996e0fe7887f4ceb575"
-dependencies = [
- "regex-automata",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39354c10dd07468c2e73926b23bb9c2caca74c5501e38a35da70406f1d923310"
-dependencies = [
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
-
 [[package]]
 name = "ringbuf"
 version = "0.3.2"

framework/jinux-frame/Cargo.toml

@@ -18,13 +18,12 @@ log = "0.4"
 lazy_static = { version = "1.0", features = ["spin_no_std"] }
 trapframe = { git = "https://github.com/sdww0/trapframe-rs", rev = "e886763" }
 inherit-methods-macro = { git = "https://github.com/jinzhao-dev/inherit-methods-macro", rev = "98f7e3e" }
-regex = { version = "1.9.1", default-features = false, features = ["unicode"] }
 
 [target.x86_64-custom.dependencies]
 x86_64 = "0.14.2"
 x86 = "0.52.0"
 acpi = "4.1.1"
 aml = "0.16.3"
-multiboot2 = { version = "0.16.0", features = [] }
+multiboot2 = "0.16.0"
 
 [features]

framework/jinux-frame/src/boot/kcmdline.rs

@@ -14,7 +14,6 @@ use alloc::{
     vec::Vec,
 };
 use log::debug;
-use regex::Regex;
 
 #[derive(PartialEq, Debug)]
 struct InitprocArg {
@@ -55,6 +54,20 @@ impl KCmdlineArg {
     }
 }
 
+// Split the command line string by spaces but preserve
+// ones that are protected by double quotes(`"`).
+fn split_arg(input: &str) -> impl Iterator<Item = &str> {
+    let mut inside_quotes = false;
+
+    input.split(move |c: char| {
+        if c == '"' {
+            inside_quotes = !inside_quotes;
+        }
+
+        !inside_quotes && c.is_whitespace()
+    })
+}
+
 // Define the way to parse a string to `KCmdlineArg`.
 impl From<&str> for KCmdlineArg {
     fn from(cmdline: &str) -> Self {
@@ -64,18 +77,12 @@ impl From<&str> for KCmdlineArg {
             module_args: BTreeMap::new(),
         };
 
-        // Split the command line string by spaces but preserve
-        // ones that are protected by double quotes(`"`).
-        let re = Regex::new(r#"((\S*"[^"]*"\S*)+|\S+)"#).unwrap();
         // Every thing after the "--" mark is the initproc arguments.
         let mut kcmdline_end = false;
 
         // The main parse loop. The processing steps are arranged (not very strictly)
         // by the analysis over the Backus–Naur form syntax tree.
-        for arg in re.find_iter(cmdline).map(|m| m.as_str()) {
-            if arg == "" || arg == " " {
-                continue;
-            }
+        for arg in split_arg(cmdline) {
             // Cmdline => KernelArg "--" InitArg
             // KernelArg => Arg "\s+" KernelArg | %empty
             // InitArg => Arg "\s+" InitArg | %empty