]>
Commit | Line | Data |
---|---|---|
84ac7bea LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
b5efdb8a | 22 | #include "alloc-util.h" |
4f5dd394 | 23 | #include "escape.h" |
b11d6a7b LP |
24 | #include "extract-word.h" |
25 | #include "string-util.h" | |
84ac7bea LP |
26 | #include "utf8.h" |
27 | #include "util.h" | |
84ac7bea LP |
28 | |
29 | int extract_first_word(const char **p, char **ret, const char *separators, ExtractFlags flags) { | |
30 | _cleanup_free_ char *s = NULL; | |
31 | size_t allocated = 0, sz = 0; | |
b85e1c25 | 32 | char c; |
84ac7bea LP |
33 | int r; |
34 | ||
35 | char quote = 0; /* 0 or ' or " */ | |
36 | bool backslash = false; /* whether we've just seen a backslash */ | |
84ac7bea LP |
37 | |
38 | assert(p); | |
39 | assert(ret); | |
40 | ||
84ac7bea LP |
41 | /* Bail early if called after last value or with no input */ |
42 | if (!*p) | |
43 | goto finish_force_terminate; | |
93de9eb7 | 44 | c = **p; |
84ac7bea | 45 | |
8372da44 FB |
46 | if (!separators) |
47 | separators = WHITESPACE; | |
48 | ||
84ac7bea LP |
49 | /* Parses the first word of a string, and returns it in |
50 | * *ret. Removes all quotes in the process. When parsing fails | |
51 | * (because of an uneven number of quotes or similar), leaves | |
52 | * the pointer *p at the first invalid character. */ | |
53 | ||
b85e1c25 FB |
54 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) |
55 | if (!GREEDY_REALLOC(s, allocated, sz+1)) | |
56 | return -ENOMEM; | |
84ac7bea | 57 | |
93de9eb7 | 58 | for (;; (*p) ++, c = **p) { |
b85e1c25 FB |
59 | if (c == 0) |
60 | goto finish_force_terminate; | |
61 | else if (strchr(separators, c)) { | |
93de9eb7 FB |
62 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) { |
63 | (*p) ++; | |
b85e1c25 | 64 | goto finish_force_next; |
93de9eb7 | 65 | } |
b85e1c25 | 66 | } else { |
84ac7bea LP |
67 | /* We found a non-blank character, so we will always |
68 | * want to return a string (even if it is empty), | |
69 | * allocate it here. */ | |
70 | if (!GREEDY_REALLOC(s, allocated, sz+1)) | |
71 | return -ENOMEM; | |
b85e1c25 | 72 | break; |
84ac7bea | 73 | } |
b85e1c25 FB |
74 | } |
75 | ||
93de9eb7 | 76 | for (;; (*p) ++, c = **p) { |
84ac7bea LP |
77 | if (backslash) { |
78 | if (!GREEDY_REALLOC(s, allocated, sz+7)) | |
79 | return -ENOMEM; | |
80 | ||
81 | if (c == 0) { | |
82 | if ((flags & EXTRACT_CUNESCAPE_RELAX) && | |
83 | (!quote || flags & EXTRACT_RELAX)) { | |
84 | /* If we find an unquoted trailing backslash and we're in | |
85 | * EXTRACT_CUNESCAPE_RELAX mode, keep it verbatim in the | |
86 | * output. | |
87 | * | |
88 | * Unbalanced quotes will only be allowed in EXTRACT_RELAX | |
89 | * mode, EXTRACT_CUNESCAPE_RELAX mode does not allow them. | |
90 | */ | |
91 | s[sz++] = '\\'; | |
92 | goto finish_force_terminate; | |
93 | } | |
94 | if (flags & EXTRACT_RELAX) | |
95 | goto finish_force_terminate; | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | if (flags & EXTRACT_CUNESCAPE) { | |
dcd12626 | 100 | uint32_t u; |
84ac7bea LP |
101 | |
102 | r = cunescape_one(*p, (size_t) -1, &c, &u); | |
103 | if (r < 0) { | |
104 | if (flags & EXTRACT_CUNESCAPE_RELAX) { | |
105 | s[sz++] = '\\'; | |
106 | s[sz++] = c; | |
3ff13c29 FB |
107 | } else |
108 | return -EINVAL; | |
109 | } else { | |
110 | (*p) += r - 1; | |
111 | ||
112 | if (c != 0) | |
113 | s[sz++] = c; /* normal explicit char */ | |
114 | else | |
115 | sz += utf8_encode_unichar(s + sz, u); /* unicode chars we'll encode as utf8 */ | |
84ac7bea | 116 | } |
84ac7bea LP |
117 | } else |
118 | s[sz++] = c; | |
119 | ||
84ac7bea LP |
120 | backslash = false; |
121 | ||
122 | } else if (quote) { /* inside either single or double quotes */ | |
27fc921b FB |
123 | for (;; (*p) ++, c = **p) { |
124 | if (c == 0) { | |
125 | if (flags & EXTRACT_RELAX) | |
126 | goto finish_force_terminate; | |
127 | return -EINVAL; | |
128 | } else if (c == quote) { /* found the end quote */ | |
129 | quote = 0; | |
130 | break; | |
131 | } else if (c == '\\') { | |
132 | backslash = true; | |
133 | break; | |
134 | } else { | |
135 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
136 | return -ENOMEM; | |
84ac7bea | 137 | |
27fc921b FB |
138 | s[sz++] = c; |
139 | } | |
84ac7bea LP |
140 | } |
141 | ||
84ac7bea | 142 | } else { |
27fc921b FB |
143 | for (;; (*p) ++, c = **p) { |
144 | if (c == 0) | |
145 | goto finish_force_terminate; | |
146 | else if ((c == '\'' || c == '"') && (flags & EXTRACT_QUOTES)) { | |
147 | quote = c; | |
148 | break; | |
149 | } else if (c == '\\') { | |
150 | backslash = true; | |
151 | break; | |
152 | } else if (strchr(separators, c)) { | |
153 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) { | |
154 | (*p) ++; | |
155 | goto finish_force_next; | |
156 | } | |
0247447e FB |
157 | /* Skip additional coalesced separators. */ |
158 | for (;; (*p) ++, c = **p) { | |
159 | if (c == 0) | |
160 | goto finish_force_terminate; | |
161 | if (!strchr(separators, c)) | |
162 | break; | |
163 | } | |
164 | goto finish; | |
165 | ||
27fc921b FB |
166 | } else { |
167 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
168 | return -ENOMEM; | |
84ac7bea | 169 | |
27fc921b FB |
170 | s[sz++] = c; |
171 | } | |
84ac7bea LP |
172 | } |
173 | } | |
84ac7bea LP |
174 | } |
175 | ||
176 | finish_force_terminate: | |
177 | *p = NULL; | |
178 | finish: | |
179 | if (!s) { | |
180 | *p = NULL; | |
181 | *ret = NULL; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | finish_force_next: | |
186 | s[sz] = 0; | |
187 | *ret = s; | |
188 | s = NULL; | |
189 | ||
190 | return 1; | |
191 | } | |
192 | ||
193 | int extract_first_word_and_warn( | |
194 | const char **p, | |
195 | char **ret, | |
196 | const char *separators, | |
197 | ExtractFlags flags, | |
198 | const char *unit, | |
199 | const char *filename, | |
200 | unsigned line, | |
201 | const char *rvalue) { | |
202 | ||
dea7b6b0 LP |
203 | /* Try to unquote it, if it fails, warn about it and try again |
204 | * but this time using EXTRACT_CUNESCAPE_RELAX to keep the | |
205 | * backslashes verbatim in invalid escape sequences. */ | |
206 | ||
84ac7bea LP |
207 | const char *save; |
208 | int r; | |
209 | ||
210 | save = *p; | |
211 | r = extract_first_word(p, ret, separators, flags); | |
dea7b6b0 LP |
212 | if (r >= 0) |
213 | return r; | |
214 | ||
215 | if (r == -EINVAL && !(flags & EXTRACT_CUNESCAPE_RELAX)) { | |
84ac7bea LP |
216 | |
217 | /* Retry it with EXTRACT_CUNESCAPE_RELAX. */ | |
218 | *p = save; | |
219 | r = extract_first_word(p, ret, separators, flags|EXTRACT_CUNESCAPE_RELAX); | |
dea7b6b0 LP |
220 | if (r >= 0) { |
221 | /* It worked this time, hence it must have been an invalid escape sequence we could correct. */ | |
222 | log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Invalid escape sequences in line, correcting: \"%s\"", rvalue); | |
223 | return r; | |
224 | } | |
225 | ||
226 | /* If it's still EINVAL; then it must be unbalanced quoting, report this. */ | |
227 | if (r == -EINVAL) | |
228 | return log_syntax(unit, LOG_ERR, filename, line, r, "Unbalanced quoting, ignoring: \"%s\"", rvalue); | |
84ac7bea LP |
229 | } |
230 | ||
dea7b6b0 LP |
231 | /* Can be any error, report it */ |
232 | return log_syntax(unit, LOG_ERR, filename, line, r, "Unable to decode word \"%s\", ignoring: %m", rvalue); | |
84ac7bea LP |
233 | } |
234 | ||
235 | int extract_many_words(const char **p, const char *separators, ExtractFlags flags, ...) { | |
236 | va_list ap; | |
237 | char **l; | |
238 | int n = 0, i, c, r; | |
239 | ||
240 | /* Parses a number of words from a string, stripping any | |
241 | * quotes if necessary. */ | |
242 | ||
243 | assert(p); | |
244 | ||
245 | /* Count how many words are expected */ | |
246 | va_start(ap, flags); | |
247 | for (;;) { | |
248 | if (!va_arg(ap, char **)) | |
249 | break; | |
250 | n++; | |
251 | } | |
252 | va_end(ap); | |
253 | ||
254 | if (n <= 0) | |
255 | return 0; | |
256 | ||
257 | /* Read all words into a temporary array */ | |
258 | l = newa0(char*, n); | |
259 | for (c = 0; c < n; c++) { | |
260 | ||
261 | r = extract_first_word(p, &l[c], separators, flags); | |
262 | if (r < 0) { | |
263 | int j; | |
264 | ||
265 | for (j = 0; j < c; j++) | |
266 | free(l[j]); | |
267 | ||
268 | return r; | |
269 | } | |
270 | ||
271 | if (r == 0) | |
272 | break; | |
273 | } | |
274 | ||
275 | /* If we managed to parse all words, return them in the passed | |
276 | * in parameters */ | |
277 | va_start(ap, flags); | |
278 | for (i = 0; i < n; i++) { | |
279 | char **v; | |
280 | ||
281 | v = va_arg(ap, char **); | |
282 | assert(v); | |
283 | ||
284 | *v = l[i]; | |
285 | } | |
286 | va_end(ap); | |
287 | ||
288 | return c; | |
289 | } |