cleanup and use perror

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

static char *sccsid = "@(#)umount.c     4.4 (Berkeley) %G%";

#include <stdio.h>
#include <fstab.h>

/*
* umount
*/

#define NMOUNT  16
#define NAMSIZ  32

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

char    *rindex();
int     vflag, all, errs;

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

       argc--, argv++;
       sync();
       mf = open("/etc/mtab", 0);
       read(mf, (char *)mtab, sizeof (mtab));
again:
       if (!strcmp(*argv, "-v")) {
               vflag++;
               argc--, argv++;
               goto again;
       }
       if (!strcmp(*argv, "-a")) {
               all++;
               argc--, argv++;
               goto again;
       }
       if (argc == 0 && !all) {
               fprintf(stderr, "Usage: umount [ -a ] [ -v ] [ dev ... ]\n");
               exit(1);
       }
       if (all) {
               if (setfsent() == 0)
                       perror(FSTAB), exit(1);
               umountall();
               exit(0);
       }
       while (argc > 0) {
               if (umountfs(*argv++) == 0)
                       errs++;
               argc--;
       }
       exit(errs);
}

umountall()
{
       struct fstab fs, *fsp;

       if ((fsp = getfsent()) == 0)
               return;
       fs = *fsp;      /* save info locally; it is static from getfsent() */
       umountall();
       if (strcmp(fs.fs_file, "/") == 0)
               return;
       if (strcmp(fs.fs_type, FSTAB_RW) && strcmp(fs.fs_type, FSTAB_RO))
               return;
       if (umountfs(fs.fs_spec) < 0) {
               perror(fs.fs_spec);
               return;
       }
}

struct  mtab zeromtab;

umountfs(name)
       char *name;
{
       register char *p1, *p2;
       register struct mtab *mp;
       int mf;

       if (umount(name) < 0) {
               perror(name);
               return (0);
       }
       if (vflag)
               fprintf(stderr, "%s: Unmounted\n", name);
       while ((p1 = rindex(name, '/')) && p1[1] == 0)
               *p1 = 0;
       if (p1)
               name = p1 + 1;
       for (mp = mtab; mp < &mtab[NMOUNT]; mp++) {
               if (strncmp(mp->spec, name, sizeof (mp->spec)))
                       continue;
               *mp = zeromtab;
               for (mp = &mtab[NMOUNT]; mp >= mtab; mp--)
                       if (mp->file[0])
                               break;
               mp++;
               mf = creat("/etc/mtab", 0644);
               write(mf, (char *)mtab, (mp-mtab) * sizeof (struct mtab));
               return (1);
       }
       fprintf(stderr, "%s: Not mounted\n", name);
       return (0);
}