src/misc/mntent.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <mntent.h>
   4 #include <errno.h>
   5
   6 FILE *setmntent(const char *name, const char *mode)
   7 {
   8         return fopen(name, mode);
   9 }
  10
  11 int endmntent(FILE *f)
  12 {
  13         if (f) fclose(f);
  14         return 1;
  15 }
  16
  17 struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
  18 {
  19         int cnt, n[8];
  20
  21         mnt->mnt_freq = 0;
  22         mnt->mnt_passno = 0;
  23
  24         do {
  25                 fgets(linebuf, buflen, f);
  26                 if (feof(f) || ferror(f)) return 0;
  27                 if (!strchr(linebuf, '\n')) {
  28                         fscanf(f, "%*[^\n]%*[\n]");
  29                         errno = ERANGE;
  30                         return 0;
  31                 }
  32                 cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
  33                         n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
  34                         &mnt->mnt_freq, &mnt->mnt_passno);
  35         } while (cnt < 2 || linebuf[n[0]] == '#');
  36
  37         linebuf[n[1]] = 0;
  38         linebuf[n[3]] = 0;
  39         linebuf[n[5]] = 0;
  40         linebuf[n[7]] = 0;
  41
  42         mnt->mnt_fsname = linebuf+n[0];
  43         mnt->mnt_dir = linebuf+n[2];
  44         mnt->mnt_type = linebuf+n[4];
  45         mnt->mnt_opts = linebuf+n[6];
  46
  47         return mnt;
  48 }
  49
  50 struct mntent *getmntent(FILE *f)
  51 {
  52         static char linebuf[256];
  53         static struct mntent mnt;
  54         return getmntent_r(f, &mnt, linebuf, sizeof linebuf);
  55 }
  56
  57 int addmntent(FILE *f, const struct mntent *mnt)
  58 {
  59         if (fseek(f, 0, SEEK_END)) return 1;
  60         return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
  61                 mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
  62                 mnt->mnt_freq, mnt->mnt_passno) < 0;
  63 }
  64
  65 char *hasmntopt(const struct mntent *mnt, const char *opt)
  66 {
  67         return strstr(mnt->mnt_opts, opt);
  68 }