blkid-udev.c

/* vim: set ts=4 sw=4 sts=4 et: */
#include <blkid.h>
#include <stdio.h>

static void print_udev_format (FILE* fp, const char *name, const char *value)
{
    char enc[265], safe[256];
    *safe = *enc = 0;
    if (!strcmp (name, "TYPE") || !strcmp (name, "VERSION")) {
        blkid_encode_string (value, enc, sizeof(enc));
        fprintf (fp, "ID_FS_%s=%s\n", name, enc);
    } else if (!strcmp (name, "UUID") ||
         !strcmp(name, "LABEL") ||
         !strcmp(name, "UUID_SUB")) {

        blkid_safe_string (value, safe, sizeof(safe));
        fprintf (fp, "ID_FS_%s=%s\n", name, safe);

        blkid_encode_string (value, enc, sizeof(enc));
        fprintf (fp, "ID_FS_%s_ENC=%s\n", name, enc);
    } else {
        fprintf (fp, "ID_FS_%s=%s\n", name, value);
    }
}

static void print_tags (FILE* fp, blkid_dev dev)
{
    if (!dev)
        return;

    const char *name, *value, *devname = blkid_dev_devname (dev);
    blkid_tag_iterate i = blkid_tag_iterate_begin (dev);
    while (blkid_tag_next (i, &name, &value) == 0) {
        print_udev_format (fp, name, value);
    }
    blkid_tag_iterate_end (i);
}

int blkid_dev_print_udev (FILE* fp, const char* devname)
{
    blkid_cache cache = 0;

    if (blkid_get_cache(&cache, 0) < 0)
        return -1;

    int rc = 0;
    blkid_dev dev = blkid_get_dev (cache, devname, BLKID_DEV_NORMAL);
    if (dev) {
        print_tags (fp, dev);
    } else {
        rc = -1;
    }

    blkid_put_cache (cache);
    return rc;
}

int main (int argc, const char* argv[])
{
    if (argc < 2) {
        fprintf (stderr, "blkid-udev <device path>\n");
        return 1;
    }

    blkid_dev_print_udev (stdout, argv[1]);
    return 0;
}