Bug Summary

File:build-scan/../src/basic/unit-name.c
Warning:line 587, column 32
Use of zero-allocated memory

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name unit-name.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -menable-no-infs -menable-no-nans -menable-unsafe-fp-math -fno-signed-zeros -mreassociate -freciprocal-math -fdenormal-fp-math=preserve-sign,preserve-sign -ffp-contract=fast -fno-rounding-math -ffast-math -ffinite-math-only -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib64/clang/12.0.0 -include config.h -I src/basic/libbasic.a.p -I src/basic -I ../src/basic -I src/shared -I ../src/shared -I src/systemd -I ../src/systemd -I src/journal -I ../src/journal -I src/journal-remote -I ../src/journal-remote -I src/nspawn -I ../src/nspawn -I src/resolve -I ../src/resolve -I src/timesync -I ../src/timesync -I ../src/time-wait-sync -I src/login -I ../src/login -I src/udev -I ../src/udev -I src/libudev -I ../src/libudev -I src/core -I ../src/core -I ../src/libsystemd/sd-bus -I ../src/libsystemd/sd-device -I ../src/libsystemd/sd-hwdb -I ../src/libsystemd/sd-id128 -I ../src/libsystemd/sd-netlink -I ../src/libsystemd/sd-network -I src/libsystemd-network -I ../src/libsystemd-network -I . -I .. -I /usr/include/blkid -I /usr/include/libmount -D _FILE_OFFSET_BITS=64 -internal-isystem /usr/local/include -internal-isystem /usr/lib64/clang/12.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wwrite-strings -Wno-unused-parameter -Wno-missing-field-initializers -Wno-unused-result -Wno-format-signedness -Wno-error=nonnull -std=gnu99 -fconst-strings -fdebug-compilation-dir /home/mrc0mmand/repos/@redhat-plumbers/systemd-rhel8/build-scan -ferror-limit 19 -fvisibility default -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -analyzer-output=html -faddrsig -o /tmp/scan-build-2021-07-16-221226-1465241-1 -x c ../src/basic/unit-name.c

../src/basic/unit-name.c

→
1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include <errno(*__errno_location ()).h>
4#include <stddef.h>
5#include <stdint.h>
6#include <stdlib.h>
7#include <string.h>
8
9#include "alloc-util.h"
10#include "glob-util.h"
11#include "hexdecoct.h"
12#include "path-util.h"
13#include "special.h"
14#include "string-util.h"
15#include "strv.h"
16#include "unit-name.h"
17
18/* Characters valid in a unit name. */
19#define VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" \
20 DIGITS"0123456789" \
21 LETTERS"abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
22 ":-_.\\"
23
24/* The same, but also permits the single @ character that may appear */
25#define VALID_CHARS_WITH_AT"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" \
26 "@" \
27 VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\"
28
29/* All chars valid in a unit name glob */
30#define VALID_CHARS_GLOB"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" "[]!-*?" \
31 VALID_CHARS_WITH_AT"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" \
32 "[]!-*?"
33
34bool_Bool unit_name_is_valid(const char *n, UnitNameFlags flags) {
35 const char *e, *i, *at;
36
37 assert((flags & ~(UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0)do { if ((__builtin_expect(!!(!((flags & ~(UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("(flags & ~(UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0"
), "../src/basic/unit-name.c", 37, __PRETTY_FUNCTION__); } while
(0);
38
39 if (_unlikely_(flags == 0)(__builtin_expect(!!(flags == 0),0)))
40 return false0;
41
42 if (isempty(n))
43 return false0;
44
45 if (strlen(n) >= UNIT_NAME_MAX256)
46 return false0;
47
48 e = strrchr(n, '.');
49 if (!e || e == n)
50 return false0;
51
52 if (unit_type_from_string(e + 1) < 0)
53 return false0;
54
55 for (i = n, at = NULL((void*)0); i < e; i++) {
56
57 if (*i == '@' && !at)
58 at = i;
59
60 if (!strchr("@" VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\", *i))
61 return false0;
62 }
63
64 if (at == n)
65 return false0;
66
67 if (flags & UNIT_NAME_PLAIN)
68 if (!at)
69 return true1;
70
71 if (flags & UNIT_NAME_INSTANCE)
72 if (at && e > at + 1)
73 return true1;
74
75 if (flags & UNIT_NAME_TEMPLATE)
76 if (at && e == at + 1)
77 return true1;
78
79 return false0;
80}
81
82bool_Bool unit_prefix_is_valid(const char *p) {
83
84 /* We don't allow additional @ in the prefix string */
85
86 if (isempty(p))
87 return false0;
88
89 return in_charset(p, VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\");
90}
91
92bool_Bool unit_instance_is_valid(const char *i) {
93
94 /* The max length depends on the length of the string, so we
95 * don't really check this here. */
96
97 if (isempty(i))
98 return false0;
99
100 /* We allow additional @ in the instance string, we do not
101 * allow them in the prefix! */
102
103 return in_charset(i, "@" VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\");
104}
105
106bool_Bool unit_suffix_is_valid(const char *s) {
107 if (isempty(s))
108 return false0;
109
110 if (s[0] != '.')
111 return false0;
112
113 if (unit_type_from_string(s + 1) < 0)
114 return false0;
115
116 return true1;
117}
118
119int unit_name_to_prefix(const char *n, char **ret) {
120 const char *p;
121 char *s;
122
123 assert(n)do { if ((__builtin_expect(!!(!(n)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("n"), "../src/basic/unit-name.c", 123, __PRETTY_FUNCTION__
); } while (0);
124 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 124,
__PRETTY_FUNCTION__); } while (0);
125
126 if (!unit_name_is_valid(n, UNIT_NAME_ANY))
127 return -EINVAL22;
128
129 p = strchr(n, '@');
130 if (!p)
131 p = strrchr(n, '.');
132
133 assert_se(p)do { if ((__builtin_expect(!!(!(p)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("p"), "../src/basic/unit-name.c", 133, __PRETTY_FUNCTION__
); } while (0);
134
135 s = strndup(n, p - n);
136 if (!s)
137 return -ENOMEM12;
138
139 *ret = s;
140 return 0;
141}
142
143int unit_name_to_instance(const char *n, char **instance) {
144 const char *p, *d;
145 char *i;
146
147 assert(n)do { if ((__builtin_expect(!!(!(n)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("n"), "../src/basic/unit-name.c", 147, __PRETTY_FUNCTION__
); } while (0);
148 assert(instance)do { if ((__builtin_expect(!!(!(instance)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("instance"), "../src/basic/unit-name.c",
148, __PRETTY_FUNCTION__); } while (0);
149
150 if (!unit_name_is_valid(n, UNIT_NAME_ANY))
151 return -EINVAL22;
152
153 /* Everything past the first @ and before the last . is the instance */
154 p = strchr(n, '@');
155 if (!p) {
156 *instance = NULL((void*)0);
157 return 0;
158 }
159
160 p++;
161
162 d = strrchr(p, '.');
163 if (!d)
164 return -EINVAL22;
165
166 i = strndup(p, d-p);
167 if (!i)
168 return -ENOMEM12;
169
170 *instance = i;
171 return 1;
172}
173
174int unit_name_to_prefix_and_instance(const char *n, char **ret) {
175 const char *d;
176 char *s;
177
178 assert(n)do { if ((__builtin_expect(!!(!(n)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("n"), "../src/basic/unit-name.c", 178, __PRETTY_FUNCTION__
); } while (0);
179 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 179,
__PRETTY_FUNCTION__); } while (0);
180
181 if (!unit_name_is_valid(n, UNIT_NAME_ANY))
182 return -EINVAL22;
183
184 d = strrchr(n, '.');
185 if (!d)
186 return -EINVAL22;
187
188 s = strndup(n, d - n);
189 if (!s)
190 return -ENOMEM12;
191
192 *ret = s;
193 return 0;
194}
195
196UnitType unit_name_to_type(const char *n) {
197 const char *e;
198
199 assert(n)do { if ((__builtin_expect(!!(!(n)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("n"), "../src/basic/unit-name.c", 199, __PRETTY_FUNCTION__
); } while (0);
200
201 if (!unit_name_is_valid(n, UNIT_NAME_ANY))
202 return _UNIT_TYPE_INVALID;
203
204 assert_se(e = strrchr(n, '.'))do { if ((__builtin_expect(!!(!(e = strrchr(n, '.'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("e = strrchr(n, '.')"), "../src/basic/unit-name.c"
, 204, __PRETTY_FUNCTION__); } while (0);
205
206 return unit_type_from_string(e + 1);
207}
208
209int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
210 char *e, *s;
211 size_t a, b;
212
213 assert(n)do { if ((__builtin_expect(!!(!(n)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("n"), "../src/basic/unit-name.c", 213, __PRETTY_FUNCTION__
); } while (0);
214 assert(suffix)do { if ((__builtin_expect(!!(!(suffix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("suffix"), "../src/basic/unit-name.c", 214
, __PRETTY_FUNCTION__); } while (0);
215 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 215,
__PRETTY_FUNCTION__); } while (0);
216
217 if (!unit_name_is_valid(n, UNIT_NAME_ANY))
218 return -EINVAL22;
219
220 if (!unit_suffix_is_valid(suffix))
221 return -EINVAL22;
222
223 assert_se(e = strrchr(n, '.'))do { if ((__builtin_expect(!!(!(e = strrchr(n, '.'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("e = strrchr(n, '.')"), "../src/basic/unit-name.c"
, 223, __PRETTY_FUNCTION__); } while (0);
224
225 a = e - n;
226 b = strlen(suffix);
227
228 s = new(char, a + b + 1)((char*) malloc_multiply(sizeof(char), (a + b + 1)));
229 if (!s)
230 return -ENOMEM12;
231
232 strcpy(mempcpy(s, n, a), suffix);
233 *ret = s;
234
235 return 0;
236}
237
238int unit_name_build(const char *prefix, const char *instance, const char *suffix, char **ret) {
239 UnitType type;
240
241 assert(prefix)do { if ((__builtin_expect(!!(!(prefix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("prefix"), "../src/basic/unit-name.c", 241
, __PRETTY_FUNCTION__); } while (0);
242 assert(suffix)do { if ((__builtin_expect(!!(!(suffix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("suffix"), "../src/basic/unit-name.c", 242
, __PRETTY_FUNCTION__); } while (0);
243 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 243,
__PRETTY_FUNCTION__); } while (0);
244
245 if (suffix[0] != '.')
246 return -EINVAL22;
247
248 type = unit_type_from_string(suffix + 1);
249 if (type < 0)
250 return -EINVAL22;
251
252 return unit_name_build_from_type(prefix, instance, type, ret);
253}
254
255int unit_name_build_from_type(const char *prefix, const char *instance, UnitType type, char **ret) {
256 const char *ut;
257 char *s;
258
259 assert(prefix)do { if ((__builtin_expect(!!(!(prefix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("prefix"), "../src/basic/unit-name.c", 259
, __PRETTY_FUNCTION__); } while (0);
260 assert(type >= 0)do { if ((__builtin_expect(!!(!(type >= 0)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("type >= 0"), "../src/basic/unit-name.c"
, 260, __PRETTY_FUNCTION__); } while (0);
261 assert(type < _UNIT_TYPE_MAX)do { if ((__builtin_expect(!!(!(type < _UNIT_TYPE_MAX)),0)
)) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("type < _UNIT_TYPE_MAX"
), "../src/basic/unit-name.c", 261, __PRETTY_FUNCTION__); } while
(0);
262 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 262,
__PRETTY_FUNCTION__); } while (0);
263
264 if (!unit_prefix_is_valid(prefix))
265 return -EINVAL22;
266
267 if (instance && !unit_instance_is_valid(instance))
268 return -EINVAL22;
269
270 ut = unit_type_to_string(type);
271
272 if (!instance)
273 s = strjoin(prefix, ".", ut)strjoin_real((prefix), ".", ut, ((void*)0));
274 else
275 s = strjoin(prefix, "@", instance, ".", ut)strjoin_real((prefix), "@", instance, ".", ut, ((void*)0));
276 if (!s)
277 return -ENOMEM12;
278
279 *ret = s;
280 return 0;
281}
282
283static char *do_escape_char(char c, char *t) {
284 assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("t"), "../src/basic/unit-name.c", 284, __PRETTY_FUNCTION__
); } while (0);
285
286 *(t++) = '\\';
287 *(t++) = 'x';
288 *(t++) = hexchar(c >> 4);
289 *(t++) = hexchar(c);
290
291 return t;
292}
293
294static char *do_escape(const char *f, char *t) {
295 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 295, __PRETTY_FUNCTION__
); } while (0);
296 assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("t"), "../src/basic/unit-name.c", 296, __PRETTY_FUNCTION__
); } while (0);
297
298 /* do not create units with a leading '.', like for "/.dotdir" mount points */
299 if (*f == '.') {
300 t = do_escape_char(*f, t);
301 f++;
302 }
303
304 for (; *f; f++) {
305 if (*f == '/')
306 *(t++) = '-';
307 else if (IN_SET(*f, '-', '\\')({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){'-', '\\'})/sizeof(int)]; switch(*f) { case
'-': case '\\': _found = 1; break; default: break; } _found;
}) || !strchr(VALID_CHARS"0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\", *f))
308 t = do_escape_char(*f, t);
309 else
310 *(t++) = *f;
311 }
312
313 return t;
314}
315
316char *unit_name_escape(const char *f) {
317 char *r, *t;
318
319 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 319, __PRETTY_FUNCTION__
); } while (0);
320
321 r = new(char, strlen(f)*4+1)((char*) malloc_multiply(sizeof(char), (strlen(f)*4+1)));
322 if (!r)
323 return NULL((void*)0);
324
325 t = do_escape(f, r);
326 *t = 0;
327
328 return r;
329}
330
331int unit_name_unescape(const char *f, char **ret) {
332 _cleanup_free___attribute__((cleanup(freep))) char *r = NULL((void*)0);
333 char *t;
334
335 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 335, __PRETTY_FUNCTION__
); } while (0);
336
337 r = strdup(f);
338 if (!r)
339 return -ENOMEM12;
340
341 for (t = r; *f; f++) {
342 if (*f == '-')
343 *(t++) = '/';
344 else if (*f == '\\') {
345 int a, b;
346
347 if (f[1] != 'x')
348 return -EINVAL22;
349
350 a = unhexchar(f[2]);
351 if (a < 0)
352 return -EINVAL22;
353
354 b = unhexchar(f[3]);
355 if (b < 0)
356 return -EINVAL22;
357
358 *(t++) = (char) (((uint8_t) a << 4U) | (uint8_t) b);
359 f += 3;
360 } else
361 *(t++) = *f;
362 }
363
364 *t = 0;
365
366 *ret = TAKE_PTR(r)({ typeof(r) _ptr_ = (r); (r) = ((void*)0); _ptr_; });
367
368 return 0;
369}
370
371int unit_name_path_escape(const char *f, char **ret) {
372 char *p, *s;
373
374 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 374, __PRETTY_FUNCTION__
); } while (0);
375 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 375,
__PRETTY_FUNCTION__); } while (0);
376
377 p = strdupa(f)(__extension__ ({ const char *__old = (f); size_t __len = strlen
(__old) + 1; char *__new = (char *) __builtin_alloca (__len)
; (char *) memcpy (__new, __old, __len); }));
378 if (!p)
379 return -ENOMEM12;
380
381 path_simplify(p, false0);
382
383 if (empty_or_root(p))
384 s = strdup("-");
385 else {
386 if (!path_is_normalized(p))
387 return -EINVAL22;
388
389 /* Truncate trailing slashes */
390 delete_trailing_chars(p, "/");
391
392 /* Truncate leading slashes */
393 p = skip_leading_chars(p, "/");
394
395 s = unit_name_escape(p);
396 }
397 if (!s)
398 return -ENOMEM12;
399
400 *ret = s;
401 return 0;
402}
403
404int unit_name_path_unescape(const char *f, char **ret) {
405 char *s;
406 int r;
407
408 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 408, __PRETTY_FUNCTION__
); } while (0);
409
410 if (isempty(f))
411 return -EINVAL22;
412
413 if (streq(f, "-")(strcmp((f),("-")) == 0)) {
414 s = strdup("/");
415 if (!s)
416 return -ENOMEM12;
417 } else {
418 char *w;
419
420 r = unit_name_unescape(f, &w);
421 if (r < 0)
422 return r;
423
424 /* Don't accept trailing or leading slashes */
425 if (startswith(w, "/") || endswith(w, "/")) {
426 free(w);
427 return -EINVAL22;
428 }
429
430 /* Prefix a slash again */
431 s = strappend("/", w);
432 free(w);
433 if (!s)
434 return -ENOMEM12;
435
436 if (!path_is_normalized(s)) {
437 free(s);
438 return -EINVAL22;
439 }
440 }
441
442 if (ret)
443 *ret = s;
444 else
445 free(s);
446
447 return 0;
448}
449
450int unit_name_replace_instance(const char *f, const char *i, char **ret) {
451 const char *p, *e;
452 char *s;
453 size_t a, b;
454
455 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 455, __PRETTY_FUNCTION__
); } while (0);
456 assert(i)do { if ((__builtin_expect(!!(!(i)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("i"), "../src/basic/unit-name.c", 456, __PRETTY_FUNCTION__
); } while (0);
457 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 457,
__PRETTY_FUNCTION__); } while (0);
458
459 if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
460 return -EINVAL22;
461 if (!unit_instance_is_valid(i))
462 return -EINVAL22;
463
464 assert_se(p = strchr(f, '@'))do { if ((__builtin_expect(!!(!(p = strchr(f, '@'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("p = strchr(f, '@')"), "../src/basic/unit-name.c"
, 464, __PRETTY_FUNCTION__); } while (0);
465 assert_se(e = strrchr(f, '.'))do { if ((__builtin_expect(!!(!(e = strrchr(f, '.'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("e = strrchr(f, '.')"), "../src/basic/unit-name.c"
, 465, __PRETTY_FUNCTION__); } while (0);
466
467 a = p - f;
468 b = strlen(i);
469
470 s = new(char, a + 1 + b + strlen(e) + 1)((char*) malloc_multiply(sizeof(char), (a + 1 + b + strlen(e)
+ 1)));
471 if (!s)
472 return -ENOMEM12;
473
474 strcpy(mempcpy(mempcpy(s, f, a + 1), i, b), e);
475
476 *ret = s;
477 return 0;
478}
479
480int unit_name_template(const char *f, char **ret) {
481 const char *p, *e;
482 char *s;
483 size_t a;
484
485 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 485, __PRETTY_FUNCTION__
); } while (0);
486 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 486,
__PRETTY_FUNCTION__); } while (0);
487
488 if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
489 return -EINVAL22;
490
491 assert_se(p = strchr(f, '@'))do { if ((__builtin_expect(!!(!(p = strchr(f, '@'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("p = strchr(f, '@')"), "../src/basic/unit-name.c"
, 491, __PRETTY_FUNCTION__); } while (0);
492 assert_se(e = strrchr(f, '.'))do { if ((__builtin_expect(!!(!(e = strrchr(f, '.'))),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("e = strrchr(f, '.')"), "../src/basic/unit-name.c"
, 492, __PRETTY_FUNCTION__); } while (0);
493
494 a = p - f;
495
496 s = new(char, a + 1 + strlen(e) + 1)((char*) malloc_multiply(sizeof(char), (a + 1 + strlen(e) + 1
)));
497 if (!s)
498 return -ENOMEM12;
499
500 strcpy(mempcpy(s, f, a + 1), e);
501
502 *ret = s;
503 return 0;
504}
505
506int unit_name_from_path(const char *path, const char *suffix, char **ret) {
507 _cleanup_free___attribute__((cleanup(freep))) char *p = NULL((void*)0);
508 char *s = NULL((void*)0);
509 int r;
510
511 assert(path)do { if ((__builtin_expect(!!(!(path)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("path"), "../src/basic/unit-name.c", 511
, __PRETTY_FUNCTION__); } while (0);
512 assert(suffix)do { if ((__builtin_expect(!!(!(suffix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("suffix"), "../src/basic/unit-name.c", 512
, __PRETTY_FUNCTION__); } while (0);
513 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 513,
__PRETTY_FUNCTION__); } while (0);
514
515 if (!unit_suffix_is_valid(suffix))
516 return -EINVAL22;
517
518 r = unit_name_path_escape(path, &p);
519 if (r < 0)
520 return r;
521
522 s = strappend(p, suffix);
523 if (!s)
524 return -ENOMEM12;
525
526 *ret = s;
527 return 0;
528}
529
530int unit_name_from_path_instance(const char *prefix, const char *path, const char *suffix, char **ret) {
531 _cleanup_free___attribute__((cleanup(freep))) char *p = NULL((void*)0);
532 char *s;
533 int r;
534
535 assert(prefix)do { if ((__builtin_expect(!!(!(prefix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("prefix"), "../src/basic/unit-name.c", 535
, __PRETTY_FUNCTION__); } while (0);
536 assert(path)do { if ((__builtin_expect(!!(!(path)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("path"), "../src/basic/unit-name.c", 536
, __PRETTY_FUNCTION__); } while (0);
537 assert(suffix)do { if ((__builtin_expect(!!(!(suffix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("suffix"), "../src/basic/unit-name.c", 537
, __PRETTY_FUNCTION__); } while (0);
538 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 538,
__PRETTY_FUNCTION__); } while (0);
539
540 if (!unit_prefix_is_valid(prefix))
541 return -EINVAL22;
542
543 if (!unit_suffix_is_valid(suffix))
544 return -EINVAL22;
545
546 r = unit_name_path_escape(path, &p);
547 if (r < 0)
548 return r;
549
550 s = strjoin(prefix, "@", p, suffix)strjoin_real((prefix), "@", p, suffix, ((void*)0));
551 if (!s)
552 return -ENOMEM12;
553
554 *ret = s;
555 return 0;
556}
557
558int unit_name_to_path(const char *name, char **ret) {
559 _cleanup_free___attribute__((cleanup(freep))) char *prefix = NULL((void*)0);
560 int r;
561
562 assert(name)do { if ((__builtin_expect(!!(!(name)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("name"), "../src/basic/unit-name.c", 562
, __PRETTY_FUNCTION__); } while (0);
563
564 r = unit_name_to_prefix(name, &prefix);
565 if (r < 0)
566 return r;
567
568 return unit_name_path_unescape(prefix, ret);
569}
570
571static bool_Bool do_escape_mangle(const char *f, bool_Bool allow_globs, char *t) {
572 const char *valid_chars;
573 bool_Bool mangled = false0;
574
575 assert(f)do { if ((__builtin_expect(!!(!(f)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("f"), "../src/basic/unit-name.c", 575, __PRETTY_FUNCTION__
); } while (0);
26
←
Taking false branch
→
27
←
Loop condition is false. Exiting loop
→
576 assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("t"), "../src/basic/unit-name.c", 576, __PRETTY_FUNCTION__
); } while (0);
28
←
Taking false branch
→
29
←
Loop condition is false. Exiting loop
→
577
578 /* We'll only escape the obvious characters here, to play safe.
579 *
580 * Returns true if any characters were mangled, false otherwise.
581 */
582
583 valid_chars = allow_globs
29.1
'allow_globs' is false
29.1
'allow_globs' is false
 ? VALID_CHARS_GLOB"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" "[]!-*?" : VALID_CHARS_WITH_AT"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\";
30
←
'?' condition is false
→
584
585 for (; *f; f++)
31
←
Loop condition is true. Entering loop body
→
586 if (*f == '/') {
32
←
Assuming the condition is true
→
33
←
Taking true branch
→
587 *(t++) = '-';
34
←
Use of zero-allocated memory
588 mangled = true1;
589 } else if (!strchr(valid_chars, *f)) {
590 t = do_escape_char(*f, t);
591 mangled = true1;
592 } else
593 *(t++) = *f;
594 *t = 0;
595
596 return mangled;
597}
598
599/**
600 * Convert a string to a unit name. /dev/blah is converted to dev-blah.device,
601 * /blah/blah is converted to blah-blah.mount, anything else is left alone,
602 * except that @suffix is appended if a valid unit suffix is not present.
603 *
604 * If @allow_globs, globs characters are preserved. Otherwise, they are escaped.
605 */
606int unit_name_mangle_with_suffix(const char *name, UnitNameMangle flags, const char *suffix, char **ret) {
607 char *s;
608 int r;
609 bool_Bool mangled;
610
611 assert(name)do { if ((__builtin_expect(!!(!(name)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("name"), "../src/basic/unit-name.c", 611
, __PRETTY_FUNCTION__); } while (0);
1
Assuming 'name' is non-null
→
2
←
Taking false branch
→
3
←
Loop condition is false. Exiting loop
→
612 assert(suffix)do { if ((__builtin_expect(!!(!(suffix)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("suffix"), "../src/basic/unit-name.c", 612
, __PRETTY_FUNCTION__); } while (0);
4
←
Assuming 'suffix' is non-null
→
5
←
Taking false branch
→
6
←
Loop condition is false. Exiting loop
→
613 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 613,
__PRETTY_FUNCTION__); } while (0);
7
←
Assuming 'ret' is non-null
→
8
←
Taking false branch
→
9
←
Loop condition is false. Exiting loop
→
614
615 if (isempty(name)) /* We cannot mangle empty unit names to become valid, sorry. */
10
←
Taking false branch
→
616 return -EINVAL22;
617
618 if (!unit_suffix_is_valid(suffix))
11
←
Taking false branch
→
619 return -EINVAL22;
620
621 /* Already a fully valid unit name? If so, no mangling is necessary... */
622 if (unit_name_is_valid(name, UNIT_NAME_ANY))
12
←
Assuming the condition is false
→
13
←
Taking false branch
→
623 goto good;
624
625 /* Already a fully valid globbing expression? If so, no mangling is necessary either... */
626 if ((flags & UNIT_NAME_MANGLE_GLOB) &&
14
←
Assuming the condition is false
→
627 string_is_glob(name) &&
628 in_charset(name, VALID_CHARS_GLOB"@" "0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":-_.\\" "[]!-*?"))
629 goto good;
630
631 if (is_device_path(name)) {
15
←
Assuming the condition is false
→
16
←
Taking false branch
→
632 r = unit_name_from_path(name, ".device", ret);
633 if (r >= 0)
634 return 1;
635 if (r != -EINVAL22)
636 return r;
637 }
638
639 if (path_is_absolute(name)) {
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
640 r = unit_name_from_path(name, ".mount", ret);
641 if (r >= 0)
642 return 1;
643 if (r != -EINVAL22)
644 return r;
645 }
646
647 s = new(char, strlen(name) * 4 + strlen(suffix) + 1)((char*) malloc_multiply(sizeof(char), (strlen(name) * 4 + strlen
(suffix) + 1)));
19
←
Calling 'malloc_multiply'
→
22
←
Returned allocated memory
→
648 if (!s)
23
←
Assuming 's' is non-null
→
24
←
Taking false branch
→
649 return -ENOMEM12;
650
651 mangled = do_escape_mangle(name, flags & UNIT_NAME_MANGLE_GLOB, s);
25
←
Calling 'do_escape_mangle'
→
652 if (mangled)
653 log_full(flags & UNIT_NAME_MANGLE_WARN ? LOG_NOTICE : LOG_DEBUG,({ int _level = (((flags & UNIT_NAME_MANGLE_WARN ? 5 : 7)
)), _e = ((0)), _realm = (LOG_REALM_SYSTEMD); (log_get_max_level_realm
(_realm) >= ((_level) & 0x07)) ? log_internal_realm(((
_realm) << 10 | (_level)), _e, "../src/basic/unit-name.c"
, 655, __func__, "Invalid unit name \"%s\" was escaped as \"%s\" (maybe you should use systemd-escape?)"
, name, s) : -abs(_e); })
654 "Invalid unit name \"%s\" was escaped as \"%s\" (maybe you should use systemd-escape?)",({ int _level = (((flags & UNIT_NAME_MANGLE_WARN ? 5 : 7)
)), _e = ((0)), _realm = (LOG_REALM_SYSTEMD); (log_get_max_level_realm
(_realm) >= ((_level) & 0x07)) ? log_internal_realm(((
_realm) << 10 | (_level)), _e, "../src/basic/unit-name.c"
, 655, __func__, "Invalid unit name \"%s\" was escaped as \"%s\" (maybe you should use systemd-escape?)"
, name, s) : -abs(_e); })
655 name, s)({ int _level = (((flags & UNIT_NAME_MANGLE_WARN ? 5 : 7)
)), _e = ((0)), _realm = (LOG_REALM_SYSTEMD); (log_get_max_level_realm
(_realm) >= ((_level) & 0x07)) ? log_internal_realm(((
_realm) << 10 | (_level)), _e, "../src/basic/unit-name.c"
, 655, __func__, "Invalid unit name \"%s\" was escaped as \"%s\" (maybe you should use systemd-escape?)"
, name, s) : -abs(_e); });
656
657 /* Append a suffix if it doesn't have any, but only if this is not a glob, so that we can allow "foo.*" as a
658 * valid glob. */
659 if ((!(flags & UNIT_NAME_MANGLE_GLOB) || !string_is_glob(s)) && unit_name_to_type(s) < 0)
660 strcat(s, suffix);
661
662 *ret = s;
663 return 1;
664
665good:
666 s = strdup(name);
667 if (!s)
668 return -ENOMEM12;
669
670 *ret = s;
671 return 0;
672}
673
674int slice_build_parent_slice(const char *slice, char **ret) {
675 char *s, *dash;
676 int r;
677
678 assert(slice)do { if ((__builtin_expect(!!(!(slice)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("slice"), "../src/basic/unit-name.c", 678
, __PRETTY_FUNCTION__); } while (0);
679 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 679,
__PRETTY_FUNCTION__); } while (0);
680
681 if (!slice_name_is_valid(slice))
682 return -EINVAL22;
683
684 if (streq(slice, SPECIAL_ROOT_SLICE)(strcmp((slice),("-.slice")) == 0)) {
685 *ret = NULL((void*)0);
686 return 0;
687 }
688
689 s = strdup(slice);
690 if (!s)
691 return -ENOMEM12;
692
693 dash = strrchr(s, '-');
694 if (dash)
695 strcpy(dash, ".slice");
696 else {
697 r = free_and_strdup(&s, SPECIAL_ROOT_SLICE"-.slice");
698 if (r < 0) {
699 free(s);
700 return r;
701 }
702 }
703
704 *ret = s;
705 return 1;
706}
707
708int slice_build_subslice(const char *slice, const char *name, char **ret) {
709 char *subslice;
710
711 assert(slice)do { if ((__builtin_expect(!!(!(slice)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("slice"), "../src/basic/unit-name.c", 711
, __PRETTY_FUNCTION__); } while (0);
712 assert(name)do { if ((__builtin_expect(!!(!(name)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("name"), "../src/basic/unit-name.c", 712
, __PRETTY_FUNCTION__); } while (0);
713 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/basic/unit-name.c", 713,
__PRETTY_FUNCTION__); } while (0);
714
715 if (!slice_name_is_valid(slice))
716 return -EINVAL22;
717
718 if (!unit_prefix_is_valid(name))
719 return -EINVAL22;
720
721 if (streq(slice, SPECIAL_ROOT_SLICE)(strcmp((slice),("-.slice")) == 0))
722 subslice = strappend(name, ".slice");
723 else {
724 char *e;
725
726 assert_se(e = endswith(slice, ".slice"))do { if ((__builtin_expect(!!(!(e = endswith(slice, ".slice")
)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("e = endswith(slice, \".slice\")"
), "../src/basic/unit-name.c", 726, __PRETTY_FUNCTION__); } while
(0);
727
728 subslice = new(char, (e - slice) + 1 + strlen(name) + 6 + 1)((char*) malloc_multiply(sizeof(char), ((e - slice) + 1 + strlen
(name) + 6 + 1)));
729 if (!subslice)
730 return -ENOMEM12;
731
732 stpcpy(stpcpy(stpcpy(mempcpy(subslice, slice, e - slice), "-"), name), ".slice");
733 }
734
735 *ret = subslice;
736 return 0;
737}
738
739bool_Bool slice_name_is_valid(const char *name) {
740 const char *p, *e;
741 bool_Bool dash = false0;
742
743 if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
744 return false0;
745
746 if (streq(name, SPECIAL_ROOT_SLICE)(strcmp((name),("-.slice")) == 0))
747 return true1;
748
749 e = endswith(name, ".slice");
750 if (!e)
751 return false0;
752
753 for (p = name; p < e; p++) {
754
755 if (*p == '-') {
756
757 /* Don't allow initial dash */
758 if (p == name)
759 return false0;
760
761 /* Don't allow multiple dashes */
762 if (dash)
763 return false0;
764
765 dash = true1;
766 } else
767 dash = false0;
768 }
769
770 /* Don't allow trailing hash */
771 if (dash)
772 return false0;
773
774 return true1;
775}
←

../src/basic/alloc-util.h

1/* SPDX-License-Identifier: LGPL-2.1+ */
2#pragma once
3
4#include <alloca.h>
5#include <stddef.h>
6#include <stdlib.h>
7#include <string.h>
8
9#include "macro.h"
10
11#define new(t, n)((t*) malloc_multiply(sizeof(t), (n))) ((t*) malloc_multiply(sizeof(t), (n)))
12
13#define new0(t, n)((t*) calloc((n), sizeof(t))) ((t*) calloc((n), sizeof(t)))
14
15#define newa(t, n)({ do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 15, __PRETTY_FUNCTION__); } while
(0); (t*) __builtin_alloca (sizeof(t)*(n)); }) \
16 ({ \
17 assert(!size_multiply_overflow(sizeof(t), n))do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 17, __PRETTY_FUNCTION__); } while
(0); \
18 (t*) alloca(sizeof(t)*(n))__builtin_alloca (sizeof(t)*(n)); \
19 })
20
21#define newa0(t, n)({ do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 21, __PRETTY_FUNCTION__); } while
(0); (t*) ({ char *_new_; size_t _len_ = sizeof(t)*(n); _new_
= __builtin_alloca (_len_); (void *) memset(_new_, 0, _len_)
; }); }) \
22 ({ \
23 assert(!size_multiply_overflow(sizeof(t), n))do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 23, __PRETTY_FUNCTION__); } while
(0); \
24 (t*) alloca0(sizeof(t)*(n))({ char *_new_; size_t _len_ = sizeof(t)*(n); _new_ = __builtin_alloca
(_len_); (void *) memset(_new_, 0, _len_); }); \
25 })
26
27#define newdup(t, p, n)((t*) memdup_multiply(p, sizeof(t), (n))) ((t*) memdup_multiply(p, sizeof(t), (n)))
28
29#define newdup_suffix0(t, p, n)((t*) memdup_suffix0_multiply(p, sizeof(t), (n))) ((t*) memdup_suffix0_multiply(p, sizeof(t), (n)))
30
31#define malloc0(n)(calloc(1, (n))) (calloc(1, (n)))
32
33static inline void *mfree(void *memory) {
34 free(memory);
35 return NULL((void*)0);
36}
37
38#define free_and_replace(a, b)({ free(a); (a) = (b); (b) = ((void*)0); 0; }) \
39 ({ \
40 free(a); \
41 (a) = (b); \
42 (b) = NULL((void*)0); \
43 0; \
44 })
45
46void* memdup(const void *p, size_t l) _alloc_(2);
47void* memdup_suffix0(const void *p, size_t l) _alloc_(2);
48
49static inline void freep(void *p) {
50 free(*(void**) p);
51}
52
53#define _cleanup_free___attribute__((cleanup(freep))) _cleanup_(freep)__attribute__((cleanup(freep)))
54
55static inline bool_Bool size_multiply_overflow(size_t size, size_t need) {
56 return _unlikely_(need != 0 && size > (SIZE_MAX / need))(__builtin_expect(!!(need != 0 && size > ((18446744073709551615UL
) / need)),0));
57}
58
59_malloc___attribute__ ((malloc)) _alloc_(1, 2) static inline void *malloc_multiply(size_t size, size_t need) {
60 if (size_multiply_overflow(size, need))
20
←
Taking false branch
→
61 return NULL((void*)0);
62
63 return malloc(size * need);
21
←
Memory is allocated
→
64}
65
66#if !HAVE_REALLOCARRAY1
67_alloc_(2, 3) static inline void *reallocarray(void *p, size_t need, size_t size) {
68 if (size_multiply_overflow(size, need))
69 return NULL((void*)0);
70
71 return realloc(p, size * need);
72}
73#endif
74
75_alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t size, size_t need) {
76 if (size_multiply_overflow(size, need))
77 return NULL((void*)0);
78
79 return memdup(p, size * need);
80}
81
82_alloc_(2, 3) static inline void *memdup_suffix0_multiply(const void *p, size_t size, size_t need) {
83 if (size_multiply_overflow(size, need))
84 return NULL((void*)0);
85
86 return memdup_suffix0(p, size * need);
87}
88
89void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
90void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
91
92#define GREEDY_REALLOC(array, allocated, need)greedy_realloc((void**) &(array), &(allocated), (need
), sizeof((array)[0])) \
93 greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
94
95#define GREEDY_REALLOC0(array, allocated, need)greedy_realloc0((void**) &(array), &(allocated), (need
), sizeof((array)[0])) \
96 greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
97
98#define alloca0(n)({ char *_new_; size_t _len_ = n; _new_ = __builtin_alloca (_len_
); (void *) memset(_new_, 0, _len_); }) \
99 ({ \
100 char *_new_; \
101 size_t _len_ = n; \
102 _new_ = alloca(_len_)__builtin_alloca (_len_); \
103 (void *) memset(_new_, 0, _len_); \
104 })
105
106/* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
107#define alloca_align(size, align)({ void *_ptr_; size_t _mask_ = (align) - 1; _ptr_ = __builtin_alloca
((size) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) &
~_mask_); }) \
108 ({ \
109 void *_ptr_; \
110 size_t _mask_ = (align) - 1; \
111 _ptr_ = alloca((size) + _mask_)__builtin_alloca ((size) + _mask_); \
112 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_); \
113 })
114
115#define alloca0_align(size, align)({ void *_new_; size_t _size_ = (size); _new_ = ({ void *_ptr_
; size_t _mask_ = ((align)) - 1; _ptr_ = __builtin_alloca ((_size_
) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_
); }); (void*)memset(_new_, 0, _size_); }) \
116 ({ \
117 void *_new_; \
118 size_t _size_ = (size); \
119 _new_ = alloca_align(_size_, (align))({ void *_ptr_; size_t _mask_ = ((align)) - 1; _ptr_ = __builtin_alloca
((_size_) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) &
~_mask_); }); \
120 (void*)memset(_new_, 0, _size_); \
121 })
122
123/* Takes inspiration from Rusts's Option::take() method: reads and returns a pointer, but at the same time resets it to
124 * NULL. See: https://doc.rust-lang.org/std/option/enum.Option.html#method.take */
125#define TAKE_PTR(ptr)({ typeof(ptr) _ptr_ = (ptr); (ptr) = ((void*)0); _ptr_; }) \
126 ({ \
127 typeof(ptr) _ptr_ = (ptr); \
128 (ptr) = NULL((void*)0); \
129 _ptr_; \
130 })