1 #include <stdio.h>
2 #include <string.h>
3 #include <mntent.h>
4 #include <errno.h>
5
6 static char *internal_buf;
7 static size_t internal_bufsize;
8
9 #define SENTINEL (char *)&internal_buf
10
setmntent(const char * name,const char * mode)11 FILE *setmntent(const char *name, const char *mode)
12 {
13 return fopen(name, mode);
14 }
15
endmntent(FILE * f)16 int endmntent(FILE *f)
17 {
18 if (f) fclose(f);
19 return 1;
20 }
21
getmntent_r(FILE * f,struct mntent * mnt,char * linebuf,int buflen)22 struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
23 {
24 int cnt, n[8], use_internal = (linebuf == SENTINEL);
25
26 mnt->mnt_freq = 0;
27 mnt->mnt_passno = 0;
28
29 do {
30 if (use_internal) {
31 getline(&internal_buf, &internal_bufsize, f);
32 linebuf = internal_buf;
33 } else {
34 fgets(linebuf, buflen, f);
35 }
36 if (feof(f) || ferror(f)) return 0;
37 if (!strchr(linebuf, '\n')) {
38 fscanf(f, "%*[^\n]%*[\n]");
39 errno = ERANGE;
40 return 0;
41 }
42 cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
43 n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
44 &mnt->mnt_freq, &mnt->mnt_passno);
45 } while (cnt < 2 || linebuf[n[0]] == '#');
46
47 linebuf[n[1]] = 0;
48 linebuf[n[3]] = 0;
49 linebuf[n[5]] = 0;
50 linebuf[n[7]] = 0;
51
52 mnt->mnt_fsname = linebuf+n[0];
53 mnt->mnt_dir = linebuf+n[2];
54 mnt->mnt_type = linebuf+n[4];
55 mnt->mnt_opts = linebuf+n[6];
56
57 return mnt;
58 }
59
getmntent(FILE * f)60 struct mntent *getmntent(FILE *f)
61 {
62 static struct mntent mnt;
63 return getmntent_r(f, &mnt, SENTINEL, 0);
64 }
65
addmntent(FILE * f,const struct mntent * mnt)66 int addmntent(FILE *f, const struct mntent *mnt)
67 {
68 if (fseek(f, 0, SEEK_END)) return 1;
69 return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
70 mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
71 mnt->mnt_freq, mnt->mnt_passno) < 0;
72 }
73
hasmntopt(const struct mntent * mnt,const char * opt)74 char *hasmntopt(const struct mntent *mnt, const char *opt)
75 {
76 return strstr(mnt->mnt_opts, opt);
77 }
78