regex: fix storage-exhaustion error
[glibc.git] / misc / fstab.c
blob8fbe3c7767dfb1c9bb2a3b59f7423ca462abe01e
1 /* Copyright (C) 1995-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include <fstab.h>
19 #include <mntent.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <libc-lock.h>
25 #define BUFFER_SIZE 0x1fc0
27 struct fstab_state
29 FILE *fs_fp;
30 char *fs_buffer;
31 struct mntent fs_mntres;
32 struct fstab fs_ret;
35 static struct fstab_state *fstab_init (int opt_rewind);
36 static struct mntent *fstab_fetch (struct fstab_state *state);
37 static struct fstab *fstab_convert (struct fstab_state *state);
39 static struct fstab_state fstab_state;
42 int
43 setfsent (void)
45 return fstab_init (1) != NULL;
49 struct fstab *
50 getfsent (void)
52 struct fstab_state *state;
54 state = fstab_init (0);
55 if (state == NULL)
56 return NULL;
57 if (fstab_fetch (state) == NULL)
58 return NULL;
59 return fstab_convert (state);
63 struct fstab *
64 getfsspec (const char *name)
66 struct fstab_state *state;
67 struct mntent *m;
69 state = fstab_init (1);
70 if (state == NULL)
71 return NULL;
72 while ((m = fstab_fetch (state)) != NULL)
73 if (strcmp (m->mnt_fsname, name) == 0)
74 return fstab_convert (state);
75 return NULL;
79 struct fstab *
80 getfsfile (const char *name)
82 struct fstab_state *state;
83 struct mntent *m;
85 state = fstab_init (1);
86 if (state == NULL)
87 return NULL;
88 while ((m = fstab_fetch (state)) != NULL)
89 if (strcmp (m->mnt_dir, name) == 0)
90 return fstab_convert (state);
91 return NULL;
95 void
96 endfsent (void)
98 struct fstab_state *state;
100 state = &fstab_state;
101 if (state->fs_fp != NULL)
103 (void) __endmntent (state->fs_fp);
104 state->fs_fp = NULL;
109 static struct fstab_state *
110 fstab_init (int opt_rewind)
112 struct fstab_state *state;
113 char *buffer;
114 FILE *fp;
116 state = &fstab_state;
118 buffer = state->fs_buffer;
119 if (buffer == NULL)
121 buffer = (char *) malloc (BUFFER_SIZE);
122 if (buffer == NULL)
123 return NULL;
124 state->fs_buffer = buffer;
127 fp = state->fs_fp;
128 if (fp != NULL)
130 if (opt_rewind)
131 rewind (fp);
133 else
135 fp = __setmntent (_PATH_FSTAB, "r");
136 if (fp == NULL)
137 return NULL;
138 state->fs_fp = fp;
141 return state;
145 static struct mntent *
146 fstab_fetch (struct fstab_state *state)
148 return __getmntent_r (state->fs_fp, &state->fs_mntres,
149 state->fs_buffer, BUFFER_SIZE);
153 static struct fstab *
154 fstab_convert (struct fstab_state *state)
156 struct mntent *m;
157 struct fstab *f;
159 m = &state->fs_mntres;
160 f = &state->fs_ret;
162 f->fs_spec = m->mnt_fsname;
163 f->fs_file = m->mnt_dir;
164 f->fs_vfstype = m->mnt_type;
165 f->fs_mntops = m->mnt_opts;
166 f->fs_type = (__hasmntopt (m, FSTAB_RW) ? FSTAB_RW :
167 __hasmntopt (m, FSTAB_RQ) ? FSTAB_RQ :
168 __hasmntopt (m, FSTAB_RO) ? FSTAB_RO :
169 __hasmntopt (m, FSTAB_SW) ? FSTAB_SW :
170 __hasmntopt (m, FSTAB_XX) ? FSTAB_XX :
171 "??");
172 f->fs_freq = m->mnt_freq;
173 f->fs_passno = m->mnt_passno;
174 return f;
178 /* Make sure the memory is freed if the programs ends while in
179 memory-debugging mode and something actually was allocated. */
180 libc_freeres_fn (fstab_free)
182 char *buffer;
184 buffer = fstab_state.fs_buffer;
185 free ((void *) buffer);