fuzz: Move a duplicate function into fuzz_common

fuzz/fuzz_targets/fuzz_common.rs

@@ -4,6 +4,8 @@
 // file that was distributed with this source code.
 
 use libc::{close, dup, dup2, pipe, STDERR_FILENO, STDOUT_FILENO};
+use rand::prelude::SliceRandom;
+use rand::Rng;
 use std::ffi::OsString;
 use std::io;
 use std::io::Write;
@@ -272,3 +274,26 @@ pub fn compare_result(
         }
     }
 }
+
+pub fn generate_random_string(max_length: usize) -> String {
+    let mut rng = rand::thread_rng();
+    let valid_utf8: Vec<char> = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+        .chars()
+        .collect();
+    let invalid_utf8 = [0xC3, 0x28]; // Invalid UTF-8 sequence
+    let mut result = String::new();
+
+    for _ in 0..rng.gen_range(1..=max_length) {
+        if rng.gen_bool(0.9) {
+            let ch = valid_utf8.choose(&mut rng).unwrap();
+            result.push(*ch);
+        } else {
+            let ch = invalid_utf8.choose(&mut rng).unwrap();
+            if let Some(c) = char::from_u32(*ch as u32) {
+                result.push(c);
+            }
+        }
+    }
+
+    result
+}

fuzz/fuzz_targets/fuzz_expr.rs

@@ -14,32 +14,11 @@ use std::{env, ffi::OsString};
 
 mod fuzz_common;
 use crate::fuzz_common::CommandResult;
-use crate::fuzz_common::{compare_result, generate_and_run_uumain, run_gnu_cmd};
+use crate::fuzz_common::{
+    compare_result, generate_and_run_uumain, generate_random_string, run_gnu_cmd,
+};
 static CMD_PATH: &str = "expr";
 
-fn generate_random_string(max_length: usize) -> String {
-    let mut rng = rand::thread_rng();
-    let valid_utf8: Vec<char> = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-        .chars()
-        .collect();
-    let invalid_utf8 = [0xC3, 0x28]; // Invalid UTF-8 sequence
-    let mut result = String::new();
-
-    for _ in 0..rng.gen_range(1..=max_length) {
-        if rng.gen_bool(0.9) {
-            let ch = valid_utf8.choose(&mut rng).unwrap();
-            result.push(*ch);
-        } else {
-            let ch = invalid_utf8.choose(&mut rng).unwrap();
-            if let Some(c) = char::from_u32(*ch as u32) {
-                result.push(c);
-            }
-        }
-    }
-
-    result
-}
-
 fn generate_expr(max_depth: u32) -> String {
     let mut rng = rand::thread_rng();
     let ops = ["+", "-", "*", "/", "%", "<", ">", "=", "&", "|"];

fuzz/fuzz_targets/fuzz_test.rs

@@ -14,7 +14,9 @@ use std::ffi::OsString;
 
 mod fuzz_common;
 use crate::fuzz_common::CommandResult;
-use crate::fuzz_common::{compare_result, generate_and_run_uumain, run_gnu_cmd};
+use crate::fuzz_common::{
+    compare_result, generate_and_run_uumain, generate_random_string, run_gnu_cmd,
+};
 
 #[derive(PartialEq, Debug, Clone)]
 enum ArgType {
@@ -29,29 +31,6 @@ enum ArgType {
 
 static CMD_PATH: &str = "test";
 
-fn generate_random_string(max_length: usize) -> String {
-    let mut rng = rand::thread_rng();
-    let valid_utf8: Vec<char> = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-        .chars()
-        .collect();
-    let invalid_utf8 = [0xC3, 0x28]; // Invalid UTF-8 sequence
-    let mut result = String::new();
-
-    for _ in 0..rng.gen_range(1..=max_length) {
-        if rng.gen_bool(0.9) {
-            let ch = valid_utf8.choose(&mut rng).unwrap();
-            result.push(*ch);
-        } else {
-            let ch = invalid_utf8.choose(&mut rng).unwrap();
-            if let Some(c) = char::from_u32(*ch as u32) {
-                result.push(c);
-            }
-        }
-    }
-
-    result
-}
-
 #[derive(Debug, Clone)]
 struct TestArg {
     arg: String,