From d3cf3f08d1343d6b265516d5a79ce2d197b59d26 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 4 Jan 2026 14:05:49 +0800
Subject: feat(file-system): implement read and write FAT32 File System and
 basic shell

---
 src/user/ls.cc | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 src/user/ls.cc

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

diff --git a/src/user/ls.cc b/src/user/ls.cc
new file mode 100644
index 0000000..e472578
--- /dev/null
+++ b/src/user/ls.cc
@@ -0,0 +1,112 @@
+#include "ulib/stdio.h"
+#include "ulib/stdlib.h"
+#include "ulib/string.h"
+#include "user/user.h"
+#include "common/fcntl.h"
+
+
+struct FAT32_DirEnt
+{
+    char name[11];
+    uint8 attr;
+    uint8 lcase;
+    uint8 ctime_cs;
+    uint16 ctime;
+    uint16 cdate;
+    uint16 adate;
+    uint16 fstClusHI;
+    uint16 wtime;
+    uint16 wdate;
+    uint16 fstClusLO;
+    uint32 fileSize;
+} __attribute__((packed));
+
+#define ATTR_DIRECTORY 0x10
+#define ATTR_LONG_NAME 0x0F
+
+void fmt_name(char *dst, const char *src)
+{
+    int i;
+    char *d = dst;
+
+    for (i = 0; i < 8; i++)
+    {
+        if (src[i] == ' ')
+            break;
+        *d++ = src[i];
+    }
+
+    if (src[8] != ' ')
+    {
+        *d++ = '.';
+        for (i = 8; i < 11; i++)
+        {
+            if (src[i] == ' ')
+                break;
+            *d++ = src[i];
+        }
+    }
+    *d = 0;
+
+    for (d = dst; *d; d++)
+    {
+        if (*d >= 'A' && *d <= 'Z')
+            *d += 32;
+    }
+}
+
+void ls(const char *path)
+{
+    int fd;
+    struct FAT32_DirEnt de;
+    char name_buf[16];
+
+    if ((fd = open(path, O_RDONLY)) < 0)
+    {
+        printf("ls: cannot open %s\n", path);
+        return;
+    }
+
+    while (read(fd, &de, sizeof(de)) == sizeof(de))
+    {
+        if (de.name[0] == 0)
+        {
+            break;
+        }
+
+        if ((unsigned char)de.name[0] == 0xE5)
+        {
+            continue;
+        }
+
+        if ((de.attr & ATTR_LONG_NAME) == ATTR_LONG_NAME)
+        {
+            continue;
+        }
+
+        fmt_name(name_buf, de.name);
+
+        printf("%s %d\t%s\n",
+               (de.attr & ATTR_DIRECTORY) ? "<DIR>" : "     ",
+               de.fileSize,
+               name_buf);
+    }
+
+    close(fd);
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc < 2)
+    {
+        ls(".");
+    }
+    else
+    {
+        for (int i = 1; i < argc; i++)
+        {
+            ls(argv[i]);
+        }
+    }
+    exit(0);
+}
\ No newline at end of file
-- 
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