fix: corner cases when printing large content through term interface

[lunaix-os.git] / lunaix-os / usr / stat.c

diff --git a/lunaix-os/usr/stat.c b/lunaix-os/usr/stat.c
new file mode 100644 (file)
index 0000000..108f462
--- /dev/null
+++ b/lunaix-os/usr/stat.c
@@ -0,0 +1,70 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static char buf[256];
+
+int
+main(int argc, char* argv[])
+{
+    if (argc <= 1) {
+        printf("missing operand\n");
+        return 1;
+    }
+
+    int fd = open(argv[1], FO_RDONLY | FO_NOFOLLOW);
+    if (fd < 0) {
+        printf("fail to open %d\n", fd);
+        return 1;
+    }
+
+    struct file_stat stat;
+    if (fstat(fd, &stat) < 0) {
+        printf("fail to get stat %d\n", errno);
+        return 1;
+    }
+
+    printf("File: %s ", argv[1]);
+
+    char* ftype = "directory";
+    int mode = stat.mode;
+    if ((mode & F_MDEV)) {
+        if (!((mode & F_SEQDEV) ^ F_SEQDEV)) {
+            ftype = "sequential device";
+        } else if (!((mode & F_VOLDEV) ^ F_VOLDEV)) {
+            ftype = "volumetric device";
+        } else {
+            ftype = "regular device";
+        }
+    } else if ((mode & F_MSLNK)) {
+        if (readlinkat(fd, NULL, buf, 256) < 0) {
+            printf("fail to readlink %d\n", errno);
+        } else {
+            printf("-> %s", buf);
+        }
+        ftype = "symbolic link";
+    } else if ((mode & F_MFILE)) {
+        ftype = "regular file";
+    }
+
+    printf("\nType: %s\n", ftype);
+    printf("Size: %d;  Blocks: %d;  FS Block: %d;  IO Blocks: %d\n",
+           stat.st_size,
+           stat.st_blocks,
+           stat.st_blksize,
+           stat.st_ioblksize);
+    printf("Inode: %d;  ", stat.st_ino);
+
+    dev_t* dev;
+    if (!(stat.mode & F_MDEV)) {
+        dev = &stat.st_dev;
+    } else {
+        dev = &stat.st_rdev;
+    }
+
+    printf("Device: %xh:%xh@%d;\n", dev->meta, dev->unique, dev->index);
+
+    close(fd);
+    return 0;
+}
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