ls.c

GEEKOS是一个免费的操作系统内核

/*
 * ls - List file or directory
 * Copyright (c) 2004, David H. Hovemeyer <[e-mail]>
 * $Revision: 1.18 $
 *
 * This is free software.  You are permitted to use,
 * redistribute, and modify it as specified in the file "COPYING".
 */

#include <conio.h>
#include <fileio.h>
#include <process.h>

static void List_File(const char *filename, struct VFS_File_Stat *stat)
{
    struct VFS_ACL_Entry owner = stat->acls[0];
    bool isDir = stat->isDirectory;

    Print("%c%c%c  % 6d  % 10d  %s%s%s\n",
	isDir ? 'd' : '-',
	owner.permission & O_READ ? 'r' : '-',
	owner.permission & O_WRITE ? 'w' : '-',
	owner.uid,
	stat->size,
	isDir ? "[" : "",
	filename,
	isDir ? "]" : "");
}

int main(int argc, char **argv)
{
    int rc;
    struct VFS_File_Stat stat;
    const char *filename;

    if (argc != 2) {
	Print("Usage: ls <filename>\n");
	return 1;
    }

    filename = argv[1];

    rc = Stat(filename, &stat);
    if (rc != 0) {
	Print("Could not stat %s: %s\n", argv[1], Get_Error_String(rc));
	return 1;
    }

    if (!stat.isDirectory) {
	List_File(argv[1], &stat);
    } else {
	int fd = Open_Directory(argv[1]);
	struct VFS_Dir_Entry dirent;

	if (fd < 0) {
	    Print("Could not open %s: %s\n", filename, Get_Error_String(fd));
	    Exit(1);
	}

	Print("Directory %s\n", filename);
	for (;;) {
	    int rc = Read_Entry(fd, &dirent);
	    if (rc > 0)
		break;
	    else if (rc == 0)
		List_File(dirent.name, &dirent.stats);
	    else {
		Print("Could not read directory entry: %s\n", Get_Error_String(rc));
		Exit(1);
	    }
	}

	if ((rc = Close(fd)) < 0) {
	    Print("Could not close directory %s: %s\n", filename, Get_Error_String(rc));
	    Exit(1);
	}
    }

    return 0;
}