BSD 3 release

[unix-history] / usr / src / cmd / umount.c

#define NMOUNT  16
#define NAMSIZ  32

struct mtab {
       char    file[NAMSIZ];
       char    spec[NAMSIZ];
} mtab[NMOUNT];

main(argc, argv)
char **argv;
{
       register struct mtab *mp;
       register char *p1, *p2;
       int mf;

       sync();
       mf = open("/etc/mtab", 0);
       read(mf, (char *)mtab, NMOUNT*2*NAMSIZ);
       if(argc != 2) {
               printf("arg count\n");
               return(1);
       }
       if (umount(argv[1]) < 0) {
               perror("umount");
               return(1);
       }
       p1 = argv[1];
       while(*p1++)
               ;
       p1--;
       while(*--p1 == '/')
               *p1 = '\0';
       while(p1 > argv[1] && *--p1 != '/')
               ;
       if(*p1 == '/')
               p1++;
       argv[1] = p1;
       for (mp = mtab; mp < &mtab[NMOUNT]; mp++) {
               p1 = argv[1];
               p2 = &mp->spec[0];
               while (*p1++ == *p2)
                       if (*p2++ == 0) {
                               for (p1 = mp->file; p1 < &mp->file[NAMSIZ*2];)
                                       *p1++ = 0;
                               mp = &mtab[NMOUNT];
                               while ((--mp)->file[0] == 0);
                               mf = creat("/etc/mtab", 0644);
                               write(mf, (char *)mtab, (mp-mtab+1)*2*NAMSIZ);
                               return(0);
                       }
       }
       printf("%s not in mount table\n", argv[1]);
       return(1);
}