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845dcb57 | 1 | /* Utilities for reading/writing fstab, mtab, etc. |
49f3a758 | 2 | Copyright (C) 1995,1996,1997,1998,1999,2000 Free Software Foundation, Inc. |
df4ef2ab | 3 | This file is part of the GNU C Library. |
845dcb57 | 4 | |
df4ef2ab | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
845dcb57 | 9 | |
df4ef2ab UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
845dcb57 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
845dcb57 | 19 | |
53308042 | 20 | #include <alloca.h> |
845dcb57 UD |
21 | #include <mntent.h> |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <sys/types.h> | |
25 | ||
50304ef0 UD |
26 | #ifdef USE_IN_LIBIO |
27 | # define flockfile(s) _IO_flockfile (s) | |
28 | # define funlockfile(s) _IO_funlockfile (s) | |
29 | #endif | |
30 | ||
845dcb57 UD |
31 | /* Prepare to begin reading and/or writing mount table entries from the |
32 | beginning of FILE. MODE is as for `fopen'. */ | |
33 | FILE * | |
34 | __setmntent (const char *file, const char *mode) | |
35 | { | |
36 | return fopen (file, mode); | |
37 | } | |
38 | weak_alias (__setmntent, setmntent) | |
39 | ||
40 | ||
41 | /* Close a stream opened with `setmntent'. */ | |
42 | int | |
43 | __endmntent (FILE *stream) | |
44 | { | |
45 | if (stream) /* SunOS 4.x allows for NULL stream */ | |
46 | fclose (stream); | |
47 | return 1; /* SunOS 4.x says to always return 1 */ | |
48 | } | |
49 | weak_alias (__endmntent, endmntent) | |
50 | ||
51 | ||
b0b422e8 UD |
52 | /* Since the values in a line are separated by spaces, a name cannot |
53 | contain a space. Therefore some programs encode spaces in names | |
54 | by the strings "\040". We undo the encoding when reading an entry. | |
55 | The decoding happens in place. */ | |
56 | static char * | |
57 | decode_name (char *buf) | |
58 | { | |
59 | char *rp = buf; | |
60 | char *wp = buf; | |
61 | ||
62 | do | |
63 | if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' && rp[3] == '0') | |
64 | { | |
65 | /* \040 is a SPACE. */ | |
66 | *wp++ = ' '; | |
67 | rp += 3; | |
68 | } | |
69 | else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '2') | |
70 | { | |
71 | /* \012 is a TAB. */ | |
72 | *wp++ = '\t'; | |
73 | rp += 3; | |
74 | } | |
75 | else if (rp[0] == '\\' && rp[1] == '\\') | |
76 | { | |
77 | /* We have to escape \\ to be able to represent all characters. */ | |
78 | *wp++ = '\\'; | |
79 | rp += 1; | |
80 | } | |
81 | else | |
82 | *wp++ = *rp; | |
83 | while (*rp++ != '\0'); | |
84 | ||
85 | return buf; | |
86 | } | |
87 | ||
88 | ||
845dcb57 UD |
89 | /* Read one mount table entry from STREAM. Returns a pointer to storage |
90 | reused on the next call, or null for EOF or error (use feof/ferror to | |
91 | check). */ | |
92 | struct mntent * | |
93 | __getmntent_r (FILE *stream, struct mntent *mp, char *buffer, int bufsiz) | |
94 | { | |
b0b422e8 | 95 | char *cp; |
845dcb57 UD |
96 | char *head; |
97 | ||
71412a8c | 98 | flockfile (stream); |
845dcb57 UD |
99 | do |
100 | { | |
101 | char *end_ptr; | |
102 | ||
71412a8c | 103 | if (fgets_unlocked (buffer, bufsiz, stream) == NULL) |
4bae5567 UD |
104 | { |
105 | funlockfile (stream); | |
106 | return NULL; | |
107 | } | |
845dcb57 UD |
108 | |
109 | end_ptr = strchr (buffer, '\n'); | |
110 | if (end_ptr != NULL) /* chop newline */ | |
111 | *end_ptr = '\0'; | |
112 | else | |
113 | { | |
114 | /* Not the whole line was read. Do it now but forget it. */ | |
115 | char tmp[1024]; | |
71412a8c | 116 | while (fgets_unlocked (tmp, sizeof tmp, stream) != NULL) |
845dcb57 UD |
117 | if (strchr (tmp, '\n') != NULL) |
118 | break; | |
119 | } | |
120 | ||
121 | head = buffer + strspn (buffer, " \t"); | |
122 | /* skip empty lines and comment lines: */ | |
b0b422e8 UD |
123 | } |
124 | while (head[0] == '\0' || head[0] == '#'); | |
845dcb57 | 125 | |
b0b422e8 UD |
126 | cp = __strsep (&head, " \t"); |
127 | mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) ""; | |
845dcb57 UD |
128 | if (head) |
129 | head += strspn (head, " \t"); | |
b0b422e8 UD |
130 | cp = __strsep (&head, " \t"); |
131 | mp->mnt_dir = cp != NULL ? decode_name (cp) : (char *) ""; | |
845dcb57 UD |
132 | if (head) |
133 | head += strspn (head, " \t"); | |
b0b422e8 UD |
134 | cp = __strsep (&head, " \t"); |
135 | mp->mnt_type = cp != NULL ? decode_name (cp) : (char *) ""; | |
845dcb57 UD |
136 | if (head) |
137 | head += strspn (head, " \t"); | |
b0b422e8 UD |
138 | cp = __strsep (&head, " \t"); |
139 | mp->mnt_opts = cp != NULL ? decode_name (cp) : (char *) ""; | |
845dcb57 UD |
140 | switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno) : 0) |
141 | { | |
142 | case 0: | |
143 | mp->mnt_freq = 0; | |
144 | case 1: | |
145 | mp->mnt_passno = 0; | |
146 | case 2: | |
49f3a758 | 147 | break; |
845dcb57 | 148 | } |
71412a8c | 149 | funlockfile (stream); |
845dcb57 UD |
150 | |
151 | return mp; | |
152 | } | |
153 | weak_alias (__getmntent_r, getmntent_r) | |
154 | ||
b0b422e8 UD |
155 | |
156 | /* We have to use an encoding for names if they contain spaces or tabs. | |
157 | To be able to represent all characters we also have to escape the | |
158 | backslash itself. This "function" must be a macro since we use | |
159 | `alloca'. */ | |
160 | #define encode_name(name) \ | |
161 | do { \ | |
162 | const char *rp = name; \ | |
163 | \ | |
164 | while (*rp != '\0') \ | |
165 | if (*rp == ' ' || *rp == '\t' || *rp == '\\') \ | |
166 | break; \ | |
63f7cb44 UD |
167 | else \ |
168 | ++rp; \ | |
b0b422e8 UD |
169 | \ |
170 | if (*rp != '\0') \ | |
171 | { \ | |
172 | /* In the worst case the length of the string can increase to \ | |
173 | founr times the current length. */ \ | |
63f7cb44 | 174 | char *wp; \ |
b0b422e8 UD |
175 | \ |
176 | rp = name; \ | |
63f7cb44 UD |
177 | name = wp = (char *) alloca (strlen (name) * 4 + 1); \ |
178 | \ | |
b0b422e8 UD |
179 | do \ |
180 | if (*rp == ' ') \ | |
181 | { \ | |
182 | *wp++ = '\\'; \ | |
183 | *wp++ = '0'; \ | |
184 | *wp++ = '4'; \ | |
185 | *wp++ = '0'; \ | |
186 | } \ | |
187 | else if (*rp == '\t') \ | |
188 | { \ | |
189 | *wp++ = '\\'; \ | |
190 | *wp++ = '0'; \ | |
191 | *wp++ = '1'; \ | |
192 | *wp++ = '2'; \ | |
193 | } \ | |
194 | else if (*rp == '\\') \ | |
195 | { \ | |
196 | *wp++ = '\\'; \ | |
197 | *wp++ = '\\'; \ | |
198 | } \ | |
199 | else \ | |
200 | *wp++ = *rp; \ | |
201 | while (*rp++ != '\0'); \ | |
b0b422e8 UD |
202 | } \ |
203 | } while (0) | |
204 | ||
205 | ||
845dcb57 UD |
206 | /* Write the mount table entry described by MNT to STREAM. |
207 | Return zero on success, nonzero on failure. */ | |
208 | int | |
209 | __addmntent (FILE *stream, const struct mntent *mnt) | |
210 | { | |
b0b422e8 | 211 | struct mntent mntcopy = *mnt; |
845dcb57 UD |
212 | if (fseek (stream, 0, SEEK_END)) |
213 | return 1; | |
214 | ||
b0b422e8 UD |
215 | /* Encode spaces and tabs in the names. */ |
216 | encode_name (mntcopy.mnt_fsname); | |
217 | encode_name (mntcopy.mnt_dir); | |
218 | encode_name (mntcopy.mnt_type); | |
219 | encode_name (mntcopy.mnt_opts); | |
220 | ||
845dcb57 | 221 | return (fprintf (stream, "%s %s %s %s %d %d\n", |
b0b422e8 UD |
222 | mntcopy.mnt_fsname, |
223 | mntcopy.mnt_dir, | |
224 | mntcopy.mnt_type, | |
225 | mntcopy.mnt_opts, | |
226 | mntcopy.mnt_freq, | |
227 | mntcopy.mnt_passno) | |
845dcb57 UD |
228 | < 0 ? 1 : 0); |
229 | } | |
230 | weak_alias (__addmntent, addmntent) | |
231 | ||
232 | ||
233 | /* Search MNT->mnt_opts for an option matching OPT. | |
234 | Returns the address of the substring, or null if none found. */ | |
235 | char * | |
236 | __hasmntopt (const struct mntent *mnt, const char *opt) | |
237 | { | |
238 | const size_t optlen = strlen (opt); | |
239 | char *rest = mnt->mnt_opts, *p; | |
240 | ||
241 | while ((p = strstr (rest, opt)) != NULL) | |
242 | { | |
6796bc80 UD |
243 | if (p == rest |
244 | || (p[-1] == ',' | |
245 | && (p[optlen] == '\0' || | |
246 | p[optlen] == '=' || | |
247 | p[optlen] == ','))) | |
845dcb57 UD |
248 | return p; |
249 | ||
250 | rest = strchr (rest, ','); | |
df4ef2ab UD |
251 | if (rest == NULL) |
252 | break; | |
253 | ++rest; | |
845dcb57 UD |
254 | } |
255 | ||
256 | return NULL; | |
257 | } | |
258 | weak_alias (__hasmntopt, hasmntopt) |