add simple stat.1 implementation

2024-01-19 14:34:58 +01:00
parent ebd07576fa
commit 8e1696d701
2 changed files with 88 additions and 0 deletions
@@ -1,5 +1,6 @@
 # List of programs.
 set(PROGRAM_LIST
+    stat.c
    false.c
    nice.c
    ls.c
@@ -0,0 +1,87 @@
+/// @file stat.c
+/// @brief display file status
+/// @copyright (c) 2024 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#include <fcntl.h>
+#include <io/debug.h>
+#include <stdio.h>
+#include <strerror.h>
+#include <string.h>
+#include <sys/bitops.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/unistd.h>
+
+// Copied from mentos/src/fs/ext2.c
+// File types.
+#define S_IFMT   0xF000 ///< Format mask
+#define S_IFSOCK 0xC000 ///< Socket
+#define S_IFLNK  0xA000 ///< Symbolic link
+#define S_IFREG  0x8000 ///< Regular file
+#define S_IFBLK  0x6000 ///< Block device
+#define S_IFDIR  0x4000 ///< Directory
+#define S_IFCHR  0x2000 ///< Character device
+#define S_IFIFO  0x1000 ///< Fifo
+
+void __print_time(const char* prefix, time_t *time) {
+    tm_t *timeinfo = localtime(time);
+    printf("%s%d-%d-%d %d:%d:%d\n",
+        prefix,
+        timeinfo->tm_year,
+        timeinfo->tm_mon,
+        timeinfo->tm_mday,
+        timeinfo->tm_hour,
+        timeinfo->tm_min,
+        timeinfo->tm_sec);
+}
+
+int main(int argc, char** argv)
+{
+    if (argc != 2) {
+        printf("%s: missing operand.\n", argv[0]);
+        printf("Try '%s --help' for more information.\n\n", argv[0]);
+        exit(1);
+    }
+    if (strcmp(argv[1], "--help") == 0) {
+        printf("Usage: %s FILE\n", argv[0]);
+        printf( "Display file status.\n");
+        exit(0);
+    }
+    stat_t statbuf;
+    if(stat(argv[1], &statbuf) == -1) {
+        printf("%s: cannot stat '%s': %s\n", argv[0], argv[1], strerror(errno));
+        exit(1);
+    }
+
+
+    printf("File: %s\n", argv[1]);
+    printf("Size: %s\n", to_human_size(statbuf.st_size));
+    printf("File type: ");
+    switch (statbuf.st_mode & S_IFMT) {
+        case S_IFBLK:  printf("block device\n");            break;
+        case S_IFCHR:  printf("character device\n");        break;
+        case S_IFDIR:  printf("directory\n");               break;
+        case S_IFIFO:  printf("FIFO/pipe\n");               break;
+        case S_IFLNK:  printf("symlink\n");                 break;
+        case S_IFREG:  printf("regular file\n");            break;
+        case S_IFSOCK: printf("socket\n");                  break;
+        default:       printf("unknown?\n");                break;
+    }
+    printf("Access: (%.4o/", statbuf.st_mode & 0xFFF);
+    // Print the access permissions.
+    putchar(bitmask_check(statbuf.st_mode, S_IRUSR) ? 'r' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IWUSR) ? 'w' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IXUSR) ? 'x' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IRGRP) ? 'r' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IWGRP) ? 'w' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IXGRP) ? 'x' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IROTH) ? 'r' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IWOTH) ? 'w' : '-');
+    putchar(bitmask_check(statbuf.st_mode, S_IXOTH) ? 'x' : '-');
+    printf(") Uid: (%d) Gid: (%d)\n", statbuf.st_uid, statbuf.st_gid);
+    __print_time("Access: ", &statbuf.st_atime);
+    __print_time("Modify: ", &statbuf.st_mtime);
+    __print_time("Change: ", &statbuf.st_ctime);
+    return 0;
+}