| 1 | /* Utilities for reading/writing fstab, mtab, etc. |
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| 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <mntent.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <allocate_once.h> |
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| 22 | |
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| 23 | struct mntent_buffer |
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| 24 | { |
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| 25 | struct mntent m; |
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| 26 | char buffer[4096]; |
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| 27 | }; |
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| 28 | |
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| 29 | /* We don't want to allocate the static buffer all the time since it |
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| 30 | is not always used (in fact, rather infrequently). */ |
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| 31 | libc_freeres_ptr (static void *mntent_buffer); |
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| 32 | |
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| 33 | static void * |
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| 34 | allocate (void *closure) |
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| 35 | { |
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| 36 | return malloc (size: sizeof (struct mntent_buffer)); |
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| 37 | } |
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| 38 | |
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| 39 | static void |
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| 40 | deallocate (void *closure, void *ptr) |
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| 41 | { |
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| 42 | free (ptr: ptr); |
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| 43 | } |
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| 44 | |
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| 45 | struct mntent * |
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| 46 | getmntent (FILE *stream) |
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| 47 | { |
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| 48 | struct mntent_buffer *buffer = allocate_once (place: &mntent_buffer, |
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| 49 | allocate: allocate, deallocate: deallocate, NULL); |
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| 50 | if (buffer == NULL) |
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| 51 | /* If no core is available we don't have a chance to run the |
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| 52 | program successfully and so returning NULL is an acceptable |
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| 53 | result. */ |
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| 54 | return NULL; |
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| 55 | |
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| 56 | return __getmntent_r (stream, &buffer->m, |
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| 57 | buffer->buffer, sizeof (buffer->buffer)); |
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| 58 | } |
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| 59 | |
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