2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
22 distribute, sublicense, and/or sell copies of the Software, and to
23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 Optimized string handling code, including c11-compliant
41 "safe C library" variants.
44 #ifndef included_clib_string_h
45 #define included_clib_string_h
47 #include <vppinfra/clib.h> /* for CLIB_LINUX_KERNEL */
48 #include <vppinfra/vector.h>
49 #include <vppinfra/error_bootstrap.h>
50 #include <vppinfra/memcpy_x86_64.h>
52 #ifdef CLIB_LINUX_KERNEL
53 #include <linux/string.h>
60 #ifdef CLIB_STANDALONE
61 #include <vppinfra/standalone_string.h>
65 #include <x86intrin.h>
68 /* Exchanges source and destination. */
69 void clib_memswap (void *_a, void *_b, uword bytes);
72 static_always_inline void *
73 clib_memcpy_fast (void *restrict dst, const void *restrict src, size_t n)
76 "memcpy(src, dst, n) with src == NULL or dst == NULL is undefined "
78 #if defined(__COVERITY__)
79 return memcpy (dst, src, n);
80 #elif defined(__x86_64__)
81 clib_memcpy_x86_64 (dst, src, n);
84 return memcpy (dst, src, n);
88 #include <vppinfra/memcpy.h>
90 /* c-11 string manipulation variants */
106 * In order to provide smooth mapping from unsafe string API to the clib string
107 * macro, we often have to improvise s1max and s2max due to the additional
108 * arguments are required for implementing the safe API. This macro is used
109 * to provide the s1max/s2max. It is not perfect because the actual
110 * s1max/s2max may be greater than 4k and the mapping from the unsafe API to
111 * the macro would cause a regression. However, it is not terribly likely.
112 * So I bet against the odds.
114 #define CLIB_STRING_MACRO_MAX 4096
117 typedef uword rsize_t;
119 void clib_c11_violation (const char *s);
120 errno_t memcpy_s (void *__restrict__ dest, rsize_t dmax,
121 const void *__restrict__ src, rsize_t n);
123 always_inline errno_t
124 memcpy_s_inline (void *__restrict__ dest, rsize_t dmax,
125 const void *__restrict__ src, rsize_t n)
131 * Optimize constant-number-of-bytes calls without asking
132 * "too many questions for someone from New Jersey"
134 if (COMPILE_TIME_CONST (n))
136 clib_memcpy_fast (dest, src, n);
141 * call bogus if: src or dst NULL, trying to copy
142 * more data than we have space in dst, or src == dst.
143 * n == 0 isn't really "bad", so check first in the
144 * "wall-of-shame" department...
146 bad = (dest == 0) + (src == 0) + (n > dmax) + (dest == src) + (n == 0);
147 if (PREDICT_FALSE (bad != 0))
149 /* Not actually trying to copy anything is OK */
153 clib_c11_violation ("dest NULL");
155 clib_c11_violation ("src NULL");
157 clib_c11_violation ("n > dmax");
159 clib_c11_violation ("dest == src");
163 /* Check for src/dst overlap, which is not allowed */
164 low = (uword) (src < dest ? src : dest);
165 hi = (uword) (src < dest ? dest : src);
167 if (PREDICT_FALSE (low + (n - 1) >= hi))
169 clib_c11_violation ("src/dest overlap");
173 clib_memcpy_fast (dest, src, n);
178 * Note: $$$ This macro is a crutch. Folks need to manually
179 * inspect every extant clib_memcpy(...) call and
180 * attempt to provide a real destination buffer size
183 #define clib_memcpy(d,s,n) memcpy_s_inline(d,n,s,n)
185 errno_t memset_s (void *s, rsize_t smax, int c, rsize_t n);
187 always_inline errno_t
188 memset_s_inline (void *s, rsize_t smax, int c, rsize_t n)
192 bad = (s == 0) + (n > smax);
194 if (PREDICT_FALSE (bad != 0))
197 clib_c11_violation ("s NULL");
199 clib_c11_violation ("n > smax");
207 * This macro is not [so much of] a crutch.
208 * It's super-typical to write:
210 * ep = pool_get (<pool>);
211 * clib_memset(ep, 0, sizeof (*ep));
213 * The compiler should delete the not-so useful
214 * (n > smax) test. TBH the NULL pointer check isn't
215 * so useful in this case, but so be it.
217 #define clib_memset(s,c,n) memset_s_inline(s,n,c,n)
219 static_always_inline void
220 clib_memcpy_le (u8 * dst, u8 * src, u8 len, u8 max_len)
222 #if defined (CLIB_HAVE_VEC256)
223 u8x32 s0, s1, d0, d1;
224 u8x32 mask = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
225 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
227 u8x32 lv = u8x32_splat (len);
228 u8x32 add = u8x32_splat (32);
230 s0 = u8x32_load_unaligned (src);
231 s1 = u8x32_load_unaligned (src + 32);
232 d0 = u8x32_load_unaligned (dst);
233 d1 = u8x32_load_unaligned (dst + 32);
235 d0 = u8x32_blend (d0, s0, u8x32_is_greater (lv, mask));
236 u8x32_store_unaligned (d0, dst);
242 d1 = u8x32_blend (d1, s1, u8x32_is_greater (lv, mask));
243 u8x32_store_unaligned (d1, dst + 32);
245 #elif defined (CLIB_HAVE_VEC128)
246 u8x16 s0, s1, s2, s3, d0, d1, d2, d3;
247 u8x16 mask = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
248 u8x16 lv = u8x16_splat (len);
249 u8x16 add = u8x16_splat (16);
251 s0 = u8x16_load_unaligned (src);
252 s1 = u8x16_load_unaligned (src + 16);
253 s2 = u8x16_load_unaligned (src + 32);
254 s3 = u8x16_load_unaligned (src + 48);
255 d0 = u8x16_load_unaligned (dst);
256 d1 = u8x16_load_unaligned (dst + 16);
257 d2 = u8x16_load_unaligned (dst + 32);
258 d3 = u8x16_load_unaligned (dst + 48);
260 d0 = u8x16_blend (d0, s0, u8x16_is_greater (lv, mask));
261 u8x16_store_unaligned (d0, dst);
267 d1 = u8x16_blend (d1, s1, u8x16_is_greater (lv, mask));
268 u8x16_store_unaligned (d1, dst + 16);
274 d2 = u8x16_blend (d2, s2, u8x16_is_greater (lv, mask));
275 u8x16_store_unaligned (d2, dst + 32);
278 d3 = u8x16_blend (d3, s3, u8x16_is_greater (lv, mask));
279 u8x16_store_unaligned (d3, dst + 48);
281 memmove (dst, src, len);
285 static_always_inline void
286 clib_memcpy_le64 (u8 * dst, u8 * src, u8 len)
288 clib_memcpy_le (dst, src, len, 64);
291 static_always_inline void
292 clib_memcpy_le32 (u8 * dst, u8 * src, u8 len)
294 clib_memcpy_le (dst, src, len, 32);
297 static_always_inline void
298 clib_memset_u64 (void *p, u64 val, uword count)
301 #if defined(CLIB_HAVE_VEC512)
302 u64x8 v512 = u64x8_splat (val);
305 u64x8_store_unaligned (v512, ptr);
312 #if defined(CLIB_HAVE_VEC256)
313 u64x4 v256 = u64x4_splat (val);
316 u64x4_store_unaligned (v256, ptr);
325 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
334 static_always_inline void
335 clib_memset_u32 (void *p, u32 val, uword count)
338 #if defined(CLIB_HAVE_VEC512)
339 u32x16 v512 = u32x16_splat (val);
342 u32x16_store_unaligned (v512, ptr);
349 #if defined(CLIB_HAVE_VEC256)
350 u32x8 v256 = u32x8_splat (val);
353 u32x8_store_unaligned (v256, ptr);
360 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
361 u32x4 v128 = u32x4_splat (val);
364 u32x4_store_unaligned (v128, ptr);
371 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
380 static_always_inline void
381 clib_memset_u16 (void *p, u16 val, uword count)
384 #if defined(CLIB_HAVE_VEC512)
385 u16x32 v512 = u16x32_splat (val);
388 u16x32_store_unaligned (v512, ptr);
395 #if defined(CLIB_HAVE_VEC256)
396 u16x16 v256 = u16x16_splat (val);
399 u16x16_store_unaligned (v256, ptr);
406 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
407 u16x8 v128 = u16x8_splat (val);
410 u16x8_store_unaligned (v128, ptr);
417 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
426 static_always_inline void
427 clib_memset_u8 (void *p, u8 val, uword count)
430 #if defined(CLIB_HAVE_VEC512)
431 u8x64 v512 = u8x64_splat (val);
434 u8x64_store_unaligned (v512, ptr);
441 #if defined(CLIB_HAVE_VEC256)
442 u8x32 v256 = u8x32_splat (val);
445 u8x32_store_unaligned (v256, ptr);
452 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
453 u8x16 v128 = u8x16_splat (val);
456 u8x16_store_unaligned (v128, ptr);
463 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
474 * This macro is to provide smooth mapping from memcmp to memcmp_s.
475 * memcmp has fewer parameters and fewer returns than memcmp_s.
476 * This macro is somewhat a crutch. When err != EOK is returned from memcmp_s,
477 * we return 0 and spit out a message in the console because there is
478 * no way to return the error code to the memcmp callers.
479 * This condition happens when s1 or s2 is null. Please note
480 * in the extant memcmp calls, if s1, s2, or both are null, memcmp returns 0
481 * anyway. So we are consistent in this case for the comparison return
482 * although we also spit out a C11 violation message in the console to
483 * warn that they pass null pointers for both s1 and s2.
484 * Applications are encouraged to use the cool C11 memcmp_s API to get the
485 * maximum benefit out of it.
487 #define clib_memcmp(s1,s2,m1) \
489 memcmp_s_inline (s1, m1, s2, m1, &__diff); \
493 errno_t memcmp_s (const void *s1, rsize_t s1max, const void *s2,
494 rsize_t s2max, int *diff);
496 always_inline errno_t
497 memcmp_s_inline (const void *s1, rsize_t s1max, const void *s2, rsize_t s2max,
502 bad = (s1 == 0) + (s2 == 0) + (diff == 0) + (s2max > s1max) + (s2max == 0) +
505 if (PREDICT_FALSE (bad != 0))
508 clib_c11_violation ("s1 NULL");
510 clib_c11_violation ("s2 NULL");
512 clib_c11_violation ("diff NULL");
514 clib_c11_violation ("s2max > s1max");
516 clib_c11_violation ("s2max 0");
518 clib_c11_violation ("s1max 0");
522 if (PREDICT_FALSE (s1 == s2))
528 *diff = memcmp (s1, s2, s2max);
533 * This macro is to provide smooth mapping from strnlen to strnlen_s
535 #define clib_strnlen(s,m) strnlen_s_inline(s,m)
537 size_t strnlen_s (const char *s, size_t maxsize);
540 strnlen_s_inline (const char *s, size_t maxsize)
544 bad = (s == 0) + (maxsize == 0);
545 if (PREDICT_FALSE (bad != 0))
548 clib_c11_violation ("s NULL");
550 clib_c11_violation ("maxsize 0");
553 return strnlen (s, maxsize);
557 * This macro is to provide smooth mapping from strcmp to strcmp_s.
558 * strcmp has fewer parameters and fewer returns than strcmp_s.
559 * This macro is somewhat a crutch. When err != EOK is returned from strcmp_s,
560 * we return 0 and spit out a message in the console because
561 * there is no way to return the error to the strcmp callers.
562 * This condition happens when s1 or s2 is null. Please note in the extant
563 * strcmp call, they would end up crashing if one of them is null.
564 * So the new behavior is no crash, but an error is displayed in the
565 * console which I think is more user friendly. If both s1 and s2 are null,
566 * strcmp returns 0. Obviously, strcmp did the pointers comparison prior
567 * to actually accessing the pointer contents. We are still consistent
568 * in this case for the comparison return although we also spit out a
569 * C11 violation message in the console to warn that they pass null pointers
570 * for both s1 and s2. The other problem is strcmp does not provide s1max,
571 * we use CLIB_STRING_MACRO_MAX and hopefully, s1 is null terminated.
572 * If not, we may be accessing memory beyonf what is intended.
573 * Applications are encouraged to use the cool C11 strcmp_s API to get the
574 * maximum benefit out of it.
576 #define clib_strcmp(s1,s2) \
577 ({ int __indicator = 0; \
578 strcmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, &__indicator); \
582 errno_t strcmp_s (const char *s1, rsize_t s1max, const char *s2,
585 always_inline errno_t
586 strcmp_s_inline (const char *s1, rsize_t s1max, const char *s2,
591 bad = (indicator == 0) + (s1 == 0) + (s2 == 0) + (s1max == 0) +
592 (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0');
594 if (PREDICT_FALSE (bad != 0))
596 if (indicator == NULL)
597 clib_c11_violation ("indicator NULL");
599 clib_c11_violation ("s1 NULL");
601 clib_c11_violation ("s2 NULL");
603 clib_c11_violation ("s1max 0");
604 if (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0')
605 clib_c11_violation ("s1 unterminated");
609 *indicator = strcmp (s1, s2);
614 * This macro is to provide smooth mapping from strncmp to strncmp_s.
615 * strncmp has fewer parameters and fewer returns than strncmp_s. That said,
616 * this macro is somewhat a crutch. When we get err != EOK from strncmp_s,
617 * we return 0 and spit out a message in the console because there is no
618 * means to return the error to the strncmp caller.
619 * This condition happens when s1 or s2 is null. In the extant strncmp call,
620 * they would end up crashing if one of them is null. So the new behavior is
621 * no crash, but error is displayed in the console which is more
622 * user friendly. If s1 and s2 are null, strncmp returns 0. Obviously,
623 * strncmp did the pointers comparison prior to actually accessing the
624 * pointer contents. We are still consistent in this case for the comparison
625 * return although we also spit out a C11 violation message in the console to
626 * warn that they pass null pointers for both s1 and s2.
627 * Applications are encouraged to use the cool C11 strncmp_s API to get the
628 * maximum benefit out of it.
630 #define clib_strncmp(s1,s2,n) \
631 ({ int __indicator = 0; \
632 strncmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, n, &__indicator); \
636 errno_t strncmp_s (const char *s1, rsize_t s1max, const char *s2, rsize_t n,
639 always_inline errno_t
640 strncmp_s_inline (const char *s1, rsize_t s1max, const char *s2, rsize_t n,
644 u8 s1_greater_s1max = (s1 && s1max && n > clib_strnlen (s1, s1max));
646 if (PREDICT_FALSE (s1_greater_s1max && indicator))
649 * strcmp allows n > s1max. If indicator is non null, we can still
650 * do the compare without any harm and return EINVAL as well as the
651 * result in indicator.
653 clib_c11_violation ("n exceeds s1 length");
654 *indicator = strncmp (s1, s2, n);
658 bad = (s1 == 0) + (s2 == 0) + (indicator == 0) + (s1max == 0) +
659 (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0') + s1_greater_s1max;
661 if (PREDICT_FALSE (bad != 0))
663 if (indicator == NULL)
664 clib_c11_violation ("indicator NULL");
666 clib_c11_violation ("s1 NULL");
668 clib_c11_violation ("s2 NULL");
670 clib_c11_violation ("s1max 0");
671 if (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0')
672 clib_c11_violation ("s1 unterminated");
673 if (s1_greater_s1max)
674 clib_c11_violation ("n exceeds s1 length");
678 *indicator = strncmp (s1, s2, n);
682 errno_t strcpy_s (char *__restrict__ dest, rsize_t dmax,
683 const char *__restrict__ src);
685 always_inline errno_t
686 strcpy_s_inline (char *__restrict__ dest, rsize_t dmax,
687 const char *__restrict__ src)
693 bad = (dest == 0) + (dmax == 0) + (src == 0);
694 if (PREDICT_FALSE (bad != 0))
697 clib_c11_violation ("dest NULL");
699 clib_c11_violation ("src NULL");
701 clib_c11_violation ("dmax 0");
705 n = clib_strnlen (src, dmax);
706 if (PREDICT_FALSE (n >= dmax))
708 clib_c11_violation ("not enough space for dest");
711 /* Not actually trying to copy anything is OK */
712 if (PREDICT_FALSE (n == 0))
715 /* Check for src/dst overlap, which is not allowed */
716 low = (uword) (src < dest ? src : dest);
717 hi = (uword) (src < dest ? dest : src);
719 if (PREDICT_FALSE (low + (n - 1) >= hi))
721 clib_c11_violation ("src/dest overlap");
725 clib_memcpy_fast (dest, src, n);
731 * This macro is provided for smooth migration from strncpy. It is not perfect
732 * because we don't know the size of the destination buffer to pass to
733 * strncpy_s. We improvise dmax with CLIB_STRING_MACRO_MAX.
734 * Applications are encouraged to move to the C11 strncpy_s API and provide
735 * the correct dmax for better error checking.
737 #define clib_strncpy(d,s,n) strncpy_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)
740 strncpy_s (char *__restrict__ dest, rsize_t dmax,
741 const char *__restrict__ src, rsize_t n);
743 always_inline errno_t
744 strncpy_s_inline (char *__restrict__ dest, rsize_t dmax,
745 const char *__restrict__ src, rsize_t n)
750 errno_t status = EOK;
752 bad = (dest == 0) + (dmax == 0) + (src == 0) + (n == 0);
753 if (PREDICT_FALSE (bad != 0))
755 /* Not actually trying to copy anything is OK */
759 clib_c11_violation ("dest NULL");
761 clib_c11_violation ("src NULL");
763 clib_c11_violation ("dmax 0");
767 if (PREDICT_FALSE (n >= dmax))
769 /* Relax and use strnlen of src */
770 clib_c11_violation ("n >= dmax");
771 m = clib_strnlen (src, dmax);
774 /* Truncate, adjust copy length to fit dest */
780 /* cap the copy to strlen(src) in case n > strlen(src) */
781 m = clib_strnlen (src, n);
783 /* Check for src/dst overlap, which is not allowed */
784 low = (uword) (src < dest ? src : dest);
785 hi = (uword) (src < dest ? dest : src);
788 * This check may fail innocently if src + dmax >= dst, but
789 * src + strlen(src) < dst. If it fails, check more carefully before
790 * blowing the whistle.
792 if (PREDICT_FALSE (low + (m - 1) >= hi))
794 m = clib_strnlen (src, m);
796 if (low + (m - 1) >= hi)
798 clib_c11_violation ("src/dest overlap");
803 clib_memcpy_fast (dest, src, m);
808 errno_t strcat_s (char *__restrict__ dest, rsize_t dmax,
809 const char *__restrict__ src);
811 always_inline errno_t
812 strcat_s_inline (char *__restrict__ dest, rsize_t dmax,
813 const char *__restrict__ src)
817 size_t m, n, dest_size;
819 bad = (dest == 0) + (dmax == 0) + (src == 0);
820 if (PREDICT_FALSE (bad != 0))
823 clib_c11_violation ("dest NULL");
825 clib_c11_violation ("src NULL");
827 clib_c11_violation ("dmax 0");
831 dest_size = clib_strnlen (dest, dmax);
832 m = dmax - dest_size;
833 n = clib_strnlen (src, m);
834 if (PREDICT_FALSE (n >= m))
836 clib_c11_violation ("not enough space for dest");
840 /* Not actually trying to concatenate anything is OK */
841 if (PREDICT_FALSE (n == 0))
844 /* Check for src/dst overlap, which is not allowed */
845 low = (uword) (src < dest ? src : dest);
846 hi = (uword) (src < dest ? dest : src);
848 if (PREDICT_FALSE (low + (n - 1) >= hi))
850 clib_c11_violation ("src/dest overlap");
854 clib_memcpy_fast (dest + dest_size, src, n);
855 dest[dest_size + n] = '\0';
859 errno_t strncat_s (char *__restrict__ dest, rsize_t dmax,
860 const char *__restrict__ src, rsize_t n);
862 always_inline errno_t
863 strncat_s_inline (char *__restrict__ dest, rsize_t dmax,
864 const char *__restrict__ src, rsize_t n)
868 size_t m, dest_size, allowed_size;
869 errno_t status = EOK;
871 bad = (dest == 0) + (src == 0) + (dmax == 0) + (n == 0);
872 if (PREDICT_FALSE (bad != 0))
874 /* Not actually trying to concatenate anything is OK */
878 clib_c11_violation ("dest NULL");
880 clib_c11_violation ("src NULL");
882 clib_c11_violation ("dmax 0");
886 /* Check for src/dst overlap, which is not allowed */
887 low = (uword) (src < dest ? src : dest);
888 hi = (uword) (src < dest ? dest : src);
890 if (PREDICT_FALSE (low + (n - 1) >= hi))
892 clib_c11_violation ("src/dest overlap");
896 dest_size = clib_strnlen (dest, dmax);
897 allowed_size = dmax - dest_size;
899 if (PREDICT_FALSE (allowed_size == 0))
901 clib_c11_violation ("no space left in dest");
905 if (PREDICT_FALSE (n >= allowed_size))
908 * unlike strcat_s, strncat_s will do the concatenation anyway when
909 * there is not enough space in dest. But it will do the truncation and
910 * null terminate dest
912 m = clib_strnlen (src, allowed_size);
913 if (m >= allowed_size)
915 m = allowed_size - 1;
920 m = clib_strnlen (src, n);
922 clib_memcpy_fast (dest + dest_size, src, m);
923 dest[dest_size + m] = '\0';
928 * This macro is to provide smooth mapping from strtok_r to strtok_s.
929 * To map strtok to this macro, the caller would have to supply an additional
930 * argument. strtokr_s requires s1max which the unsafe API does not have. So
931 * we have to improvise it with CLIB_STRING_MACRO_MAX. Unlike strtok_s,
932 * this macro cannot catch unterminated s1 and s2.
933 * Applications are encouraged to use the cool C11 strtok_s API to avoid
936 #define clib_strtok(s1,s2,p) \
937 ({ rsize_t __s1max = CLIB_STRING_MACRO_MAX; \
938 strtok_s_inline (s1, &__s1max, s2, p); \
941 char *strtok_s (char *__restrict__ s1, rsize_t * __restrict__ s1max,
942 const char *__restrict__ s2, char **__restrict__ ptr);
945 strtok_s_inline (char *__restrict__ s1, rsize_t * __restrict__ s1max,
946 const char *__restrict__ s2, char **__restrict__ ptr)
948 #define STRTOK_DELIM_MAX_LEN 16
954 bad = (s1max == 0) + (s2 == 0) + (ptr == 0) +
955 ((s1 == 0) && ptr && (*ptr == 0));
956 if (PREDICT_FALSE (bad != 0))
959 clib_c11_violation ("s2 NULL");
961 clib_c11_violation ("s1max is NULL");
963 clib_c11_violation ("ptr is NULL");
964 /* s1 == 0 and *ptr == null is no good */
965 if ((s1 == 0) && ptr && (*ptr == 0))
966 clib_c11_violation ("s1 and ptr contents are NULL");
974 * scan s1 for a delimiter
978 while (*s1 != '\0' && !ptoken)
980 if (PREDICT_FALSE (dlen == 0))
983 clib_c11_violation ("s1 unterminated");
988 * must scan the entire delimiter list
989 * ISO should have included a delimiter string limit!!
991 slen = STRTOK_DELIM_MAX_LEN;
995 if (PREDICT_FALSE (slen == 0))
998 clib_c11_violation ("s2 unterminated");
1018 * if the beginning of a token was not found, then no
1019 * need to continue the scan.
1028 * Now we need to locate the end of the token
1035 clib_c11_violation ("s1 unterminated");
1039 slen = STRTOK_DELIM_MAX_LEN;
1046 clib_c11_violation ("s2 unterminated");
1053 * found a delimiter, set to null
1054 * and return context ptr to next char
1057 *ptr = (s1 + 1); /* return pointer for next scan */
1058 *s1max = dlen - 1; /* account for the nulled delimiter */
1064 * simply scanning through the delimiter string
1078 errno_t strstr_s (char *s1, rsize_t s1max, const char *s2, rsize_t s2max,
1081 always_inline errno_t
1082 strstr_s_inline (char *s1, rsize_t s1max, const char *s2, rsize_t s2max,
1086 size_t s1_size, s2_size;
1089 (s1 == 0) + (s2 == 0) + (substring == 0) + (s1max == 0) + (s2max == 0) +
1090 (s1 && s1max && (s1[clib_strnlen (s1, s1max)] != '\0')) +
1091 (s2 && s2max && (s2[clib_strnlen (s2, s2max)] != '\0'));
1092 if (PREDICT_FALSE (bad != 0))
1095 clib_c11_violation ("s1 NULL");
1097 clib_c11_violation ("s2 NULL");
1099 clib_c11_violation ("s1max 0");
1101 clib_c11_violation ("s2max 0");
1103 clib_c11_violation ("substring NULL");
1104 if (s1 && s1max && (s1[clib_strnlen (s1, s1max)] != '\0'))
1105 clib_c11_violation ("s1 unterminated");
1106 if (s2 && s2max && (s2[clib_strnlen (s2, s2max)] != '\0'))
1107 clib_c11_violation ("s2 unterminated");
1112 * s2 points to a string with zero length, or s2 equals s1, return s1
1114 if (PREDICT_FALSE (*s2 == '\0' || s1 == s2))
1121 * s2_size > s1_size, it won't find match.
1123 s1_size = clib_strnlen (s1, s1max);
1124 s2_size = clib_strnlen (s2, s2max);
1125 if (PREDICT_FALSE (s2_size > s1_size))
1128 *substring = strstr (s1, s2);
1129 if (*substring == 0)
1135 #endif /* included_clib_string_h */
1138 * fd.io coding-style-patch-verification: ON
1141 * eval: (c-set-style "gnu")