source: MondoRescue/branches/3.0/mindi-busybox/e2fsprogs/e2fs_lib.c@ 2899

/* vi: set sw=4 ts=4: */
/*
 * See README for additional information
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */

#include "libbb.h"
#include "e2fs_lib.h"

#define HAVE_EXT2_IOCTLS 1

#if INT_MAX == LONG_MAX
#define IF_LONG_IS_SAME(...) __VA_ARGS__
#define IF_LONG_IS_WIDER(...)
#else
#define IF_LONG_IS_SAME(...)
#define IF_LONG_IS_WIDER(...) __VA_ARGS__
#endif

static void close_silently(int fd)
{
    int e = errno;
    close(fd);
    errno = e;
}


/* Iterate a function on each entry of a directory */
int iterate_on_dir(const char *dir_name,
        int FAST_FUNC (*func)(const char *, struct dirent *, void *),
        void *private)
{
    DIR *dir;
    struct dirent *de;

    dir = opendir(dir_name);
    if (dir == NULL) {
        return -1;
    }
    while ((de = readdir(dir)) != NULL) {
        func(dir_name, de, private);
    }
    closedir(dir);
    return 0;
}


/* Get/set a file version on an ext2 file system */
int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version)
{
#if HAVE_EXT2_IOCTLS
    int fd, r;
    IF_LONG_IS_WIDER(int ver;)

    fd = open(name, O_RDONLY | O_NONBLOCK);
    if (fd == -1)
        return -1;
    if (!get_version) {
        IF_LONG_IS_WIDER(
            ver = (int) set_version;
            r = ioctl(fd, EXT2_IOC_SETVERSION, &ver);
        )
        IF_LONG_IS_SAME(
            r = ioctl(fd, EXT2_IOC_SETVERSION, (void*)&set_version);
        )
    } else {
        IF_LONG_IS_WIDER(
            r = ioctl(fd, EXT2_IOC_GETVERSION, &ver);
            *get_version = ver;
        )
        IF_LONG_IS_SAME(
            r = ioctl(fd, EXT2_IOC_GETVERSION, (void*)get_version);
        )
    }
    close_silently(fd);
    return r;
#else /* ! HAVE_EXT2_IOCTLS */
    errno = EOPNOTSUPP;
    return -1;
#endif /* ! HAVE_EXT2_IOCTLS */
}


/* Get/set a file flags on an ext2 file system */
int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags)
{
#if HAVE_EXT2_IOCTLS
    struct stat buf;
    int fd, r;
    IF_LONG_IS_WIDER(int f;)

    if (stat(name, &buf) == 0 /* stat is ok */
     && !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode)
    ) {
        goto notsupp;
    }
    fd = open(name, O_RDONLY | O_NONBLOCK); /* neither read nor write asked for */
    if (fd == -1)
        return -1;

    if (!get_flags) {
        IF_LONG_IS_WIDER(
            f = (int) set_flags;
            r = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
        )
        IF_LONG_IS_SAME(
            r = ioctl(fd, EXT2_IOC_SETFLAGS, (void*)&set_flags);
        )
    } else {
        IF_LONG_IS_WIDER(
            r = ioctl(fd, EXT2_IOC_GETFLAGS, &f);
            *get_flags = f;
        )
        IF_LONG_IS_SAME(
            r = ioctl(fd, EXT2_IOC_GETFLAGS, (void*)get_flags);
        )
    }

    close_silently(fd);
    return r;
 notsupp:
#endif /* HAVE_EXT2_IOCTLS */
    errno = EOPNOTSUPP;
    return -1;
}


/* Print file attributes on an ext2 file system */
const uint32_t e2attr_flags_value[] = {
#ifdef ENABLE_COMPRESSION
    EXT2_COMPRBLK_FL,
    EXT2_DIRTY_FL,
    EXT2_NOCOMPR_FL,
    EXT2_ECOMPR_FL,
#endif
    EXT2_INDEX_FL,
    EXT2_SECRM_FL,
    EXT2_UNRM_FL,
    EXT2_SYNC_FL,
    EXT2_DIRSYNC_FL,
    EXT2_IMMUTABLE_FL,
    EXT2_APPEND_FL,
    EXT2_NODUMP_FL,
    EXT2_NOATIME_FL,
    EXT2_COMPR_FL,
    EXT3_JOURNAL_DATA_FL,
    EXT2_NOTAIL_FL,
    EXT2_TOPDIR_FL
};

const char e2attr_flags_sname[] =
#ifdef ENABLE_COMPRESSION
    "BZXE"
#endif
    "I"
    "suSDiadAcjtT";

static const char e2attr_flags_lname[] =
#ifdef ENABLE_COMPRESSION
    "Compressed_File" "\0"
    "Compressed_Dirty_File" "\0"
    "Compression_Raw_Access" "\0"
    "Compression_Error" "\0"
#endif
    "Indexed_directory" "\0"
    "Secure_Deletion" "\0"
    "Undelete" "\0"
    "Synchronous_Updates" "\0"
    "Synchronous_Directory_Updates" "\0"
    "Immutable" "\0"
    "Append_Only" "\0"
    "No_Dump" "\0"
    "No_Atime" "\0"
    "Compression_Requested" "\0"
    "Journaled_Data" "\0"
    "No_Tailmerging" "\0"
    "Top_of_Directory_Hierarchies" "\0"
    /* Another trailing NUL is added by compiler */;

void print_e2flags(FILE *f, unsigned long flags, unsigned options)
{
    const uint32_t *fv;
    const char *fn;

    fv = e2attr_flags_value;
    if (options & PFOPT_LONG) {
        int first = 1;
        fn = e2attr_flags_lname;
        do {
            if (flags & *fv) {
                if (!first)
                    fputs(", ", f);
                fputs(fn, f);
                first = 0;
            }
            fv++;
            fn += strlen(fn) + 1;
        } while (*fn);
        if (first)
            fputs("---", f);
    } else {
        fn = e2attr_flags_sname;
        do  {
            char c = '-';
            if (flags & *fv)
                c = *fn;
            fputc(c, f);
            fv++;
            fn++;
        } while (*fn);
    }
}