From 1c8e37f63d413a559825020289178d442537449e Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Fri, 2 Jan 2026 10:09:37 +0800
Subject: dev(sell): add simple libc and implement shell please see the log for
 detail.

---
 src/user/init.cc | 237 +++++++++----------------------------------------------
 1 file changed, 37 insertions(+), 200 deletions(-)

(limited to 'src/user/init.cc')

diff --git a/src/user/init.cc b/src/user/init.cc
index 27c1e2f..827a21e 100644
--- a/src/user/init.cc
+++ b/src/user/init.cc
@@ -1,221 +1,58 @@
+#include "ulib/stdio.h"
+#include "ulib/stdlib.h"
+#include "ulib/string.h"
 #include "user/user.h"
-#include "common/fcntl.h"
 
-int strlen(const char *s)
-{
-    int n = 0;
-    while (s[n])
-        n++;
-    return n;
-}
-
-void print(const char *s)
-{
-    write(1, s, strlen(s));
-}
-
-void print_int(int n)
-{
-    char buf[16];
-    int i = 0;
-    int neg = 0;
-    if (n == 0)
-    {
-        write(1, "0", 1);
-        return;
-    }
-    if (n < 0)
-    {
-        neg = 1;
-        n = -n;
-    }
-    while (n > 0)
-    {
-        buf[i++] = (n % 10) + '0';
-        n /= 10;
-    }
-    if (neg)
-        buf[i++] = '-';
-    while (i > 0)
-        write(1, &buf[--i], 1);
-}
-
-void print_hex(uint64 n)
-{
-    char buf[16];
-    char digits[] = "0123456789ABCDEF";
-    write(1, "0x", 2);
-    if (n == 0)
-    {
-        write(1, "0", 1);
-        return;
-    }
-    int i = 0;
-    while (n > 0)
-    {
-        buf[i++] = digits[n % 16];
-        n /= 16;
-    }
-    while (i > 0)
-        write(1, &buf[--i], 1);
-}
-
-void test_syscalls()
+int main()
 {
-    print("\n=== [Test] Starting System Call Check ===\n");
-
-    print("[1/4] Checking getpid()... ");
-    int my_pid = getpid();
-    if (my_pid > 0)
-    {
-        print("PASS (PID=");
-        print_int(my_pid);
-        print(")\n");
-    }
-    else
-    {
-        print("FAIL (Invalid PID)\n");
-    }
-
-    print("[2/4] Checking sbrk() heap allocation... ");
-    char *p = sbrk(4096);
-    if (p == (char *)-1)
-    {
-        print("FAIL (sbrk returned error)\n");
-    }
-    else
-    {
-        p[0] = 'A';
-        p[4095] = 'Z';
-        if (p[0] == 'A' && p[4095] == 'Z')
-        {
-            print("PASS (Allocated at ");
-            print_hex((uint64)p);
-            print(")\n");
-        }
-        else
-        {
-            print("FAIL (Memory read/write check failed)\n");
-        }
-    }
+    char *argv[] = {(char *)"sh", 0};
 
-    print("[3/4] Checking fork() and wait()...\n");
-    int pid = fork();
+    printf("[Init] Starting Lume OS Shell...\n");
 
-    if (pid < 0)
-    {
-        print("      FAIL: fork error\n");
-    }
-    else if (pid == 0)
+    while (1)
     {
-        int child_pid = getpid();
-        if (child_pid == my_pid)
+        // printf("fork start\n");
+        int pid = fork();
+        // printf("fork suceess, pid=%i\n", pid);
+        
+        if (pid < 0)
         {
-            print("      FAIL: Child has same PID as parent\n");
+            printf("[Init] fork failed!\n");
             exit(1);
         }
-        print("      [Child] I am alive. PID=");
-        print_int(child_pid);
-        print("\n");
-        print("      [Child] Exiting now.\n");
-        exit(0);
-    }
-    else
-    {
-        print("      [Parent] Forked child PID=");
-        print_int(pid);
-        print("\n");
-        print("      [Parent] Waiting for child...\n");
 
-        int waited_pid = wait(0);
-
-        if (waited_pid == pid)
+        if (pid == 0)
         {
-            print("      [Parent] Wait returned correct PID.\n");
-            print("PASS (Fork/Wait cycle)\n");
-        }
-        else
-        {
-            print("FAIL (Wait returned ");
-            print_int(waited_pid);
-            print(")\n");
-        }
-    }
-
-    print("[4/4] Checking write()... PASS (Self-evident)\n");
-
-    print("=== [Test] All Tests Finished ===\n");
-}
-
-
-int main()
-{
-    print("\n[Lume Shell] Init process started.\n");
-    print("[Test] Opening test.txt...\n");
-    int fd = open("test.txt", O_RDONLY);
-    if (fd < 0)
-    {
-        print("[Test] Open failed (Is test.txt in fs.img?)\n");
-    }
-    else
-    {
-        print("[Test] Open success! fd=");
-        print_int(fd);
-        print("\n");
+            
+            char sh_path[] = "/sh";
+            exec(sh_path, argv);
 
-        char buf[64];
-        int n = read(fd, buf, 63);
-        if (n > 0)
-        {
-            buf[n] = 0;
-            print("[Test] Read content:\n---\n");
-            print(buf);
-            print("\n---\n");
+            printf("[Init] exec sh failed\n");
+            return 0;
+            exit(1);
         }
         else
         {
-            print("[Test] Read returned ");
-            print_int(n);
-            print("\n");
-        }
-        close(fd);
-        print("[Test] File closed.\n");
-    }
-
-    
-
-    print("Commands:\n");
-    print("  s: Run System Call Tests (fork, wait, mm)\n");
-    print("  t: Run Disk Driver Test (VirtIO)\n");
-
-    while (1)
-    {
-        char buf[16];
-        write(1, "$ ", 2);
-
-        int n = read(0, buf, sizeof(buf));
-        if (n <= 0)
-            continue;
-
-        if (buf[0] == 's')
-        {
-            test_syscalls();
-        }
-        else if (buf[0] == 't')
-        {
-            if (fork() == 0)
+            // break;
+            int status;
+            int wpid;
+            while (1)
             {
-                disk_test();
-                exit(0);
+                wpid = wait((uint64)&status);
+
+                if (wpid == pid)
+                {
+                    printf("Shell Exit");
+                    break;
+                }
+                if (wpid < 0)
+                {
+                    printf("[Init] wait error or no child\n");
+
+                    break;
+                }
             }
-            wait(0);
-        }
-        else if (buf[0] != '\n')
-        {
-            print("Unknown command.\n");
         }
     }
-
-    exit(0);
     return 0;
 }
\ No newline at end of file
-- 
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