source: trunk/minix/commands/simple/dev2name.c@ 15

/* Translate internal FS device number to a /dev/ name. */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>

#include <sys/stat.h>
#include <sys/types.h>
#include <minix/config.h>
#include <minix/const.h>

#define PATH_DEV "/dev"

int
main(int argc, char *argv[])
{
        DIR *dev;
        struct dirent *e;
        int dev_n;
        if(argc <= 1 || argc > 3) {
                fprintf(stderr, "Usage: \n"
                        "%s <major> <minor>\n"
                        "%s <devicenumber>\n", argv[0], argv[0]);
                return 1;
        } else if(argc == 2) dev_n = atoi(argv[1]);
        else if(argc == 3) dev_n = (atoi(argv[1]) << MAJOR) | atoi(argv[2]);

        if(chdir(PATH_DEV) < 0) {
                perror(PATH_DEV " chdir");
                return 1;
        }

        if(!(dev=opendir("."))) {
                perror(". in " PATH_DEV);
                return 1;
        }

        while((e=readdir(dev))) {
                struct stat st;
                if(stat(e->d_name, &st) < 0) {
                        continue;
                }
                if((st.st_mode & (S_IFBLK | S_IFCHR)) && dev_n == st.st_rdev) {
                        printf("%s/%s\n", PATH_DEV, e->d_name);
                        return 0;
                }
        }

        return 1;
}