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>
51 #ifdef CLIB_LINUX_KERNEL
52 #include <linux/string.h>
59 #ifdef CLIB_STANDALONE
60 #include <vppinfra/standalone_string.h>
64 #include <x86intrin.h>
67 /* Exchanges source and destination. */
68 void clib_memswap (void *_a, void *_b, uword bytes);
71 * the vector unit memcpy variants confuse coverity
72 * so don't let it anywhere near them.
76 #include <vppinfra/memcpy_avx512.h>
77 #define clib_memcpy_fast_arch(a, b, c) clib_memcpy_fast_avx512 (a, b, c)
79 #include <vppinfra/memcpy_avx2.h>
80 #define clib_memcpy_fast_arch(a, b, c) clib_memcpy_fast_avx2 (a, b, c)
82 #include <vppinfra/memcpy_sse3.h>
83 #define clib_memcpy_fast_arch(a, b, c) clib_memcpy_fast_sse3 (a, b, c)
84 #endif /* __AVX512BITALG__ */
85 #endif /* __COVERITY__ */
87 #ifndef clib_memcpy_fast_arch
88 #define clib_memcpy_fast_arch(a, b, c) memcpy (a, b, c)
89 #endif /* clib_memcpy_fast_arch */
91 static_always_inline void *
92 clib_memcpy_fast (void *restrict dst, const void *restrict src, size_t n)
95 "memcpy(src, dst, n) with src == NULL or dst == NULL is undefined "
97 return clib_memcpy_fast_arch (dst, src, n);
100 #undef clib_memcpy_fast_arch
102 #include <vppinfra/memcpy.h>
104 /* c-11 string manipulation variants */
120 * In order to provide smooth mapping from unsafe string API to the clib string
121 * macro, we often have to improvise s1max and s2max due to the additional
122 * arguments are required for implementing the safe API. This macro is used
123 * to provide the s1max/s2max. It is not perfect because the actual
124 * s1max/s2max may be greater than 4k and the mapping from the unsafe API to
125 * the macro would cause a regression. However, it is not terribly likely.
126 * So I bet against the odds.
128 #define CLIB_STRING_MACRO_MAX 4096
131 typedef uword rsize_t;
133 void clib_c11_violation (const char *s);
134 errno_t memcpy_s (void *__restrict__ dest, rsize_t dmax,
135 const void *__restrict__ src, rsize_t n);
137 always_inline errno_t
138 memcpy_s_inline (void *__restrict__ dest, rsize_t dmax,
139 const void *__restrict__ src, rsize_t n)
145 * Optimize constant-number-of-bytes calls without asking
146 * "too many questions for someone from New Jersey"
148 if (COMPILE_TIME_CONST (n))
150 clib_memcpy_fast (dest, src, n);
155 * call bogus if: src or dst NULL, trying to copy
156 * more data than we have space in dst, or src == dst.
157 * n == 0 isn't really "bad", so check first in the
158 * "wall-of-shame" department...
160 bad = (dest == 0) + (src == 0) + (n > dmax) + (dest == src) + (n == 0);
161 if (PREDICT_FALSE (bad != 0))
163 /* Not actually trying to copy anything is OK */
167 clib_c11_violation ("dest NULL");
169 clib_c11_violation ("src NULL");
171 clib_c11_violation ("n > dmax");
173 clib_c11_violation ("dest == src");
177 /* Check for src/dst overlap, which is not allowed */
178 low = (uword) (src < dest ? src : dest);
179 hi = (uword) (src < dest ? dest : src);
181 if (PREDICT_FALSE (low + (n - 1) >= hi))
183 clib_c11_violation ("src/dest overlap");
187 clib_memcpy_fast (dest, src, n);
192 * Note: $$$ This macro is a crutch. Folks need to manually
193 * inspect every extant clib_memcpy(...) call and
194 * attempt to provide a real destination buffer size
197 #define clib_memcpy(d,s,n) memcpy_s_inline(d,n,s,n)
199 errno_t memset_s (void *s, rsize_t smax, int c, rsize_t n);
201 always_inline errno_t
202 memset_s_inline (void *s, rsize_t smax, int c, rsize_t n)
206 bad = (s == 0) + (n > smax);
208 if (PREDICT_FALSE (bad != 0))
211 clib_c11_violation ("s NULL");
213 clib_c11_violation ("n > smax");
221 * This macro is not [so much of] a crutch.
222 * It's super-typical to write:
224 * ep = pool_get (<pool>);
225 * clib_memset(ep, 0, sizeof (*ep));
227 * The compiler should delete the not-so useful
228 * (n > smax) test. TBH the NULL pointer check isn't
229 * so useful in this case, but so be it.
231 #define clib_memset(s,c,n) memset_s_inline(s,n,c,n)
233 static_always_inline void
234 clib_memcpy_le (u8 * dst, u8 * src, u8 len, u8 max_len)
236 #if defined (CLIB_HAVE_VEC256)
237 u8x32 s0, s1, d0, d1;
238 u8x32 mask = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
239 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
241 u8x32 lv = u8x32_splat (len);
242 u8x32 add = u8x32_splat (32);
244 s0 = u8x32_load_unaligned (src);
245 s1 = u8x32_load_unaligned (src + 32);
246 d0 = u8x32_load_unaligned (dst);
247 d1 = u8x32_load_unaligned (dst + 32);
249 d0 = u8x32_blend (d0, s0, u8x32_is_greater (lv, mask));
250 u8x32_store_unaligned (d0, dst);
256 d1 = u8x32_blend (d1, s1, u8x32_is_greater (lv, mask));
257 u8x32_store_unaligned (d1, dst + 32);
259 #elif defined (CLIB_HAVE_VEC128)
260 u8x16 s0, s1, s2, s3, d0, d1, d2, d3;
261 u8x16 mask = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
262 u8x16 lv = u8x16_splat (len);
263 u8x16 add = u8x16_splat (16);
265 s0 = u8x16_load_unaligned (src);
266 s1 = u8x16_load_unaligned (src + 16);
267 s2 = u8x16_load_unaligned (src + 32);
268 s3 = u8x16_load_unaligned (src + 48);
269 d0 = u8x16_load_unaligned (dst);
270 d1 = u8x16_load_unaligned (dst + 16);
271 d2 = u8x16_load_unaligned (dst + 32);
272 d3 = u8x16_load_unaligned (dst + 48);
274 d0 = u8x16_blend (d0, s0, u8x16_is_greater (lv, mask));
275 u8x16_store_unaligned (d0, dst);
281 d1 = u8x16_blend (d1, s1, u8x16_is_greater (lv, mask));
282 u8x16_store_unaligned (d1, dst + 16);
288 d2 = u8x16_blend (d2, s2, u8x16_is_greater (lv, mask));
289 u8x16_store_unaligned (d2, dst + 32);
292 d3 = u8x16_blend (d3, s3, u8x16_is_greater (lv, mask));
293 u8x16_store_unaligned (d3, dst + 48);
295 memmove (dst, src, len);
299 static_always_inline void
300 clib_memcpy_le64 (u8 * dst, u8 * src, u8 len)
302 clib_memcpy_le (dst, src, len, 64);
305 static_always_inline void
306 clib_memcpy_le32 (u8 * dst, u8 * src, u8 len)
308 clib_memcpy_le (dst, src, len, 32);
311 static_always_inline void
312 clib_memset_u64 (void *p, u64 val, uword count)
315 #if defined(CLIB_HAVE_VEC512)
316 u64x8 v512 = u64x8_splat (val);
319 u64x8_store_unaligned (v512, ptr);
326 #if defined(CLIB_HAVE_VEC256)
327 u64x4 v256 = u64x4_splat (val);
330 u64x4_store_unaligned (v256, ptr);
339 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
348 static_always_inline void
349 clib_memset_u32 (void *p, u32 val, uword count)
352 #if defined(CLIB_HAVE_VEC512)
353 u32x16 v512 = u32x16_splat (val);
356 u32x16_store_unaligned (v512, ptr);
363 #if defined(CLIB_HAVE_VEC256)
364 u32x8 v256 = u32x8_splat (val);
367 u32x8_store_unaligned (v256, ptr);
374 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
375 u32x4 v128 = u32x4_splat (val);
378 u32x4_store_unaligned (v128, ptr);
385 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
394 static_always_inline void
395 clib_memset_u16 (void *p, u16 val, uword count)
398 #if defined(CLIB_HAVE_VEC512)
399 u16x32 v512 = u16x32_splat (val);
402 u16x32_store_unaligned (v512, ptr);
409 #if defined(CLIB_HAVE_VEC256)
410 u16x16 v256 = u16x16_splat (val);
413 u16x16_store_unaligned (v256, ptr);
420 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
421 u16x8 v128 = u16x8_splat (val);
424 u16x8_store_unaligned (v128, ptr);
431 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
440 static_always_inline void
441 clib_memset_u8 (void *p, u8 val, uword count)
444 #if defined(CLIB_HAVE_VEC512)
445 u8x64 v512 = u8x64_splat (val);
448 u8x64_store_unaligned (v512, ptr);
455 #if defined(CLIB_HAVE_VEC256)
456 u8x32 v256 = u8x32_splat (val);
459 u8x32_store_unaligned (v256, ptr);
466 #if defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
467 u8x16 v128 = u8x16_splat (val);
470 u8x16_store_unaligned (v128, ptr);
477 ptr[0] = ptr[1] = ptr[2] = ptr[3] = val;
488 * This macro is to provide smooth mapping from memcmp to memcmp_s.
489 * memcmp has fewer parameters and fewer returns than memcmp_s.
490 * This macro is somewhat a crutch. When err != EOK is returned from memcmp_s,
491 * we return 0 and spit out a message in the console because there is
492 * no way to return the error code to the memcmp callers.
493 * This condition happens when s1 or s2 is null. Please note
494 * in the extant memcmp calls, if s1, s2, or both are null, memcmp returns 0
495 * anyway. So we are consistent in this case for the comparison return
496 * although we also spit out a C11 violation message in the console to
497 * warn that they pass null pointers for both s1 and s2.
498 * Applications are encouraged to use the cool C11 memcmp_s API to get the
499 * maximum benefit out of it.
501 #define clib_memcmp(s1,s2,m1) \
503 memcmp_s_inline (s1, m1, s2, m1, &__diff); \
507 errno_t memcmp_s (const void *s1, rsize_t s1max, const void *s2,
508 rsize_t s2max, int *diff);
510 always_inline errno_t
511 memcmp_s_inline (const void *s1, rsize_t s1max, const void *s2, rsize_t s2max,
516 bad = (s1 == 0) + (s2 == 0) + (diff == 0) + (s2max > s1max) + (s2max == 0) +
519 if (PREDICT_FALSE (bad != 0))
522 clib_c11_violation ("s1 NULL");
524 clib_c11_violation ("s2 NULL");
526 clib_c11_violation ("diff NULL");
528 clib_c11_violation ("s2max > s1max");
530 clib_c11_violation ("s2max 0");
532 clib_c11_violation ("s1max 0");
536 if (PREDICT_FALSE (s1 == s2))
542 *diff = memcmp (s1, s2, s2max);
547 * This macro is to provide smooth mapping from strnlen to strnlen_s
549 #define clib_strnlen(s,m) strnlen_s_inline(s,m)
551 size_t strnlen_s (const char *s, size_t maxsize);
554 strnlen_s_inline (const char *s, size_t maxsize)
558 bad = (s == 0) + (maxsize == 0);
559 if (PREDICT_FALSE (bad != 0))
562 clib_c11_violation ("s NULL");
564 clib_c11_violation ("maxsize 0");
567 return strnlen (s, maxsize);
571 * This macro is to provide smooth mapping from strcmp to strcmp_s.
572 * strcmp has fewer parameters and fewer returns than strcmp_s.
573 * This macro is somewhat a crutch. When err != EOK is returned from strcmp_s,
574 * we return 0 and spit out a message in the console because
575 * there is no way to return the error to the strcmp callers.
576 * This condition happens when s1 or s2 is null. Please note in the extant
577 * strcmp call, they would end up crashing if one of them is null.
578 * So the new behavior is no crash, but an error is displayed in the
579 * console which I think is more user friendly. If both s1 and s2 are null,
580 * strcmp returns 0. Obviously, strcmp did the pointers comparison prior
581 * to actually accessing the pointer contents. We are still consistent
582 * in this case for the comparison return although we also spit out a
583 * C11 violation message in the console to warn that they pass null pointers
584 * for both s1 and s2. The other problem is strcmp does not provide s1max,
585 * we use CLIB_STRING_MACRO_MAX and hopefully, s1 is null terminated.
586 * If not, we may be accessing memory beyonf what is intended.
587 * Applications are encouraged to use the cool C11 strcmp_s API to get the
588 * maximum benefit out of it.
590 #define clib_strcmp(s1,s2) \
591 ({ int __indicator = 0; \
592 strcmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, &__indicator); \
596 errno_t strcmp_s (const char *s1, rsize_t s1max, const char *s2,
599 always_inline errno_t
600 strcmp_s_inline (const char *s1, rsize_t s1max, const char *s2,
605 bad = (indicator == 0) + (s1 == 0) + (s2 == 0) + (s1max == 0) +
606 (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0');
608 if (PREDICT_FALSE (bad != 0))
610 if (indicator == NULL)
611 clib_c11_violation ("indicator NULL");
613 clib_c11_violation ("s1 NULL");
615 clib_c11_violation ("s2 NULL");
617 clib_c11_violation ("s1max 0");
618 if (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0')
619 clib_c11_violation ("s1 unterminated");
623 *indicator = strcmp (s1, s2);
628 * This macro is to provide smooth mapping from strncmp to strncmp_s.
629 * strncmp has fewer parameters and fewer returns than strncmp_s. That said,
630 * this macro is somewhat a crutch. When we get err != EOK from strncmp_s,
631 * we return 0 and spit out a message in the console because there is no
632 * means to return the error to the strncmp caller.
633 * This condition happens when s1 or s2 is null. In the extant strncmp call,
634 * they would end up crashing if one of them is null. So the new behavior is
635 * no crash, but error is displayed in the console which is more
636 * user friendly. If s1 and s2 are null, strncmp returns 0. Obviously,
637 * strncmp did the pointers comparison prior to actually accessing the
638 * pointer contents. We are still consistent in this case for the comparison
639 * return although we also spit out a C11 violation message in the console to
640 * warn that they pass null pointers for both s1 and s2.
641 * Applications are encouraged to use the cool C11 strncmp_s API to get the
642 * maximum benefit out of it.
644 #define clib_strncmp(s1,s2,n) \
645 ({ int __indicator = 0; \
646 strncmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, n, &__indicator); \
650 errno_t strncmp_s (const char *s1, rsize_t s1max, const char *s2, rsize_t n,
653 always_inline errno_t
654 strncmp_s_inline (const char *s1, rsize_t s1max, const char *s2, rsize_t n,
658 u8 s1_greater_s1max = (s1 && s1max && n > clib_strnlen (s1, s1max));
660 if (PREDICT_FALSE (s1_greater_s1max && indicator))
663 * strcmp allows n > s1max. If indicator is non null, we can still
664 * do the compare without any harm and return EINVAL as well as the
665 * result in indicator.
667 clib_c11_violation ("n exceeds s1 length");
668 *indicator = strncmp (s1, s2, n);
672 bad = (s1 == 0) + (s2 == 0) + (indicator == 0) + (s1max == 0) +
673 (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0') + s1_greater_s1max;
675 if (PREDICT_FALSE (bad != 0))
677 if (indicator == NULL)
678 clib_c11_violation ("indicator NULL");
680 clib_c11_violation ("s1 NULL");
682 clib_c11_violation ("s2 NULL");
684 clib_c11_violation ("s1max 0");
685 if (s1 && s1max && s1[clib_strnlen (s1, s1max)] != '\0')
686 clib_c11_violation ("s1 unterminated");
687 if (s1_greater_s1max)
688 clib_c11_violation ("n exceeds s1 length");
692 *indicator = strncmp (s1, s2, n);
696 errno_t strcpy_s (char *__restrict__ dest, rsize_t dmax,
697 const char *__restrict__ src);
699 always_inline errno_t
700 strcpy_s_inline (char *__restrict__ dest, rsize_t dmax,
701 const char *__restrict__ src)
707 bad = (dest == 0) + (dmax == 0) + (src == 0);
708 if (PREDICT_FALSE (bad != 0))
711 clib_c11_violation ("dest NULL");
713 clib_c11_violation ("src NULL");
715 clib_c11_violation ("dmax 0");
719 n = clib_strnlen (src, dmax);
720 if (PREDICT_FALSE (n >= dmax))
722 clib_c11_violation ("not enough space for dest");
725 /* Not actually trying to copy anything is OK */
726 if (PREDICT_FALSE (n == 0))
729 /* Check for src/dst overlap, which is not allowed */
730 low = (uword) (src < dest ? src : dest);
731 hi = (uword) (src < dest ? dest : src);
733 if (PREDICT_FALSE (low + (n - 1) >= hi))
735 clib_c11_violation ("src/dest overlap");
739 clib_memcpy_fast (dest, src, n);
745 * This macro is provided for smooth migration from strncpy. It is not perfect
746 * because we don't know the size of the destination buffer to pass to
747 * strncpy_s. We improvise dmax with CLIB_STRING_MACRO_MAX.
748 * Applications are encouraged to move to the C11 strncpy_s API and provide
749 * the correct dmax for better error checking.
751 #define clib_strncpy(d,s,n) strncpy_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)
754 strncpy_s (char *__restrict__ dest, rsize_t dmax,
755 const char *__restrict__ src, rsize_t n);
757 always_inline errno_t
758 strncpy_s_inline (char *__restrict__ dest, rsize_t dmax,
759 const char *__restrict__ src, rsize_t n)
764 errno_t status = EOK;
766 bad = (dest == 0) + (dmax == 0) + (src == 0) + (n == 0);
767 if (PREDICT_FALSE (bad != 0))
769 /* Not actually trying to copy anything is OK */
773 clib_c11_violation ("dest NULL");
775 clib_c11_violation ("src NULL");
777 clib_c11_violation ("dmax 0");
781 if (PREDICT_FALSE (n >= dmax))
783 /* Relax and use strnlen of src */
784 clib_c11_violation ("n >= dmax");
785 m = clib_strnlen (src, dmax);
788 /* Truncate, adjust copy length to fit dest */
794 /* cap the copy to strlen(src) in case n > strlen(src) */
795 m = clib_strnlen (src, n);
797 /* Check for src/dst overlap, which is not allowed */
798 low = (uword) (src < dest ? src : dest);
799 hi = (uword) (src < dest ? dest : src);
802 * This check may fail innocently if src + dmax >= dst, but
803 * src + strlen(src) < dst. If it fails, check more carefully before
804 * blowing the whistle.
806 if (PREDICT_FALSE (low + (m - 1) >= hi))
808 m = clib_strnlen (src, m);
810 if (low + (m - 1) >= hi)
812 clib_c11_violation ("src/dest overlap");
817 clib_memcpy_fast (dest, src, m);
822 errno_t strcat_s (char *__restrict__ dest, rsize_t dmax,
823 const char *__restrict__ src);
825 always_inline errno_t
826 strcat_s_inline (char *__restrict__ dest, rsize_t dmax,
827 const char *__restrict__ src)
831 size_t m, n, dest_size;
833 bad = (dest == 0) + (dmax == 0) + (src == 0);
834 if (PREDICT_FALSE (bad != 0))
837 clib_c11_violation ("dest NULL");
839 clib_c11_violation ("src NULL");
841 clib_c11_violation ("dmax 0");
845 dest_size = clib_strnlen (dest, dmax);
846 m = dmax - dest_size;
847 n = clib_strnlen (src, m);
848 if (PREDICT_FALSE (n >= m))
850 clib_c11_violation ("not enough space for dest");
854 /* Not actually trying to concatenate anything is OK */
855 if (PREDICT_FALSE (n == 0))
858 /* Check for src/dst overlap, which is not allowed */
859 low = (uword) (src < dest ? src : dest);
860 hi = (uword) (src < dest ? dest : src);
862 if (PREDICT_FALSE (low + (n - 1) >= hi))
864 clib_c11_violation ("src/dest overlap");
868 clib_memcpy_fast (dest + dest_size, src, n);
869 dest[dest_size + n] = '\0';
873 errno_t strncat_s (char *__restrict__ dest, rsize_t dmax,
874 const char *__restrict__ src, rsize_t n);
876 always_inline errno_t
877 strncat_s_inline (char *__restrict__ dest, rsize_t dmax,
878 const char *__restrict__ src, rsize_t n)
882 size_t m, dest_size, allowed_size;
883 errno_t status = EOK;
885 bad = (dest == 0) + (src == 0) + (dmax == 0) + (n == 0);
886 if (PREDICT_FALSE (bad != 0))
888 /* Not actually trying to concatenate anything is OK */
892 clib_c11_violation ("dest NULL");
894 clib_c11_violation ("src NULL");
896 clib_c11_violation ("dmax 0");
900 /* Check for src/dst overlap, which is not allowed */
901 low = (uword) (src < dest ? src : dest);
902 hi = (uword) (src < dest ? dest : src);
904 if (PREDICT_FALSE (low + (n - 1) >= hi))
906 clib_c11_violation ("src/dest overlap");
910 dest_size = clib_strnlen (dest, dmax);
911 allowed_size = dmax - dest_size;
913 if (PREDICT_FALSE (allowed_size == 0))
915 clib_c11_violation ("no space left in dest");
919 if (PREDICT_FALSE (n >= allowed_size))
922 * unlike strcat_s, strncat_s will do the concatenation anyway when
923 * there is not enough space in dest. But it will do the truncation and
924 * null terminate dest
926 m = clib_strnlen (src, allowed_size);
927 if (m >= allowed_size)
929 m = allowed_size - 1;
934 m = clib_strnlen (src, n);
936 clib_memcpy_fast (dest + dest_size, src, m);
937 dest[dest_size + m] = '\0';
942 * This macro is to provide smooth mapping from strtok_r to strtok_s.
943 * To map strtok to this macro, the caller would have to supply an additional
944 * argument. strtokr_s requires s1max which the unsafe API does not have. So
945 * we have to improvise it with CLIB_STRING_MACRO_MAX. Unlike strtok_s,
946 * this macro cannot catch unterminated s1 and s2.
947 * Applications are encouraged to use the cool C11 strtok_s API to avoid
950 #define clib_strtok(s1,s2,p) \
951 ({ rsize_t __s1max = CLIB_STRING_MACRO_MAX; \
952 strtok_s_inline (s1, &__s1max, s2, p); \
955 char *strtok_s (char *__restrict__ s1, rsize_t * __restrict__ s1max,
956 const char *__restrict__ s2, char **__restrict__ ptr);
959 strtok_s_inline (char *__restrict__ s1, rsize_t * __restrict__ s1max,
960 const char *__restrict__ s2, char **__restrict__ ptr)
962 #define STRTOK_DELIM_MAX_LEN 16
968 bad = (s1max == 0) + (s2 == 0) + (ptr == 0) +
969 ((s1 == 0) && ptr && (*ptr == 0));
970 if (PREDICT_FALSE (bad != 0))
973 clib_c11_violation ("s2 NULL");
975 clib_c11_violation ("s1max is NULL");
977 clib_c11_violation ("ptr is NULL");
978 /* s1 == 0 and *ptr == null is no good */
979 if ((s1 == 0) && ptr && (*ptr == 0))
980 clib_c11_violation ("s1 and ptr contents are NULL");
988 * scan s1 for a delimiter
992 while (*s1 != '\0' && !ptoken)
994 if (PREDICT_FALSE (dlen == 0))
997 clib_c11_violation ("s1 unterminated");
1002 * must scan the entire delimiter list
1003 * ISO should have included a delimiter string limit!!
1005 slen = STRTOK_DELIM_MAX_LEN;
1009 if (PREDICT_FALSE (slen == 0))
1012 clib_c11_violation ("s2 unterminated");
1032 * if the beginning of a token was not found, then no
1033 * need to continue the scan.
1042 * Now we need to locate the end of the token
1049 clib_c11_violation ("s1 unterminated");
1053 slen = STRTOK_DELIM_MAX_LEN;
1060 clib_c11_violation ("s2 unterminated");
1067 * found a delimiter, set to null
1068 * and return context ptr to next char
1071 *ptr = (s1 + 1); /* return pointer for next scan */
1072 *s1max = dlen - 1; /* account for the nulled delimiter */
1078 * simply scanning through the delimiter string
1092 errno_t strstr_s (char *s1, rsize_t s1max, const char *s2, rsize_t s2max,
1095 always_inline errno_t
1096 strstr_s_inline (char *s1, rsize_t s1max, const char *s2, rsize_t s2max,
1100 size_t s1_size, s2_size;
1103 (s1 == 0) + (s2 == 0) + (substring == 0) + (s1max == 0) + (s2max == 0) +
1104 (s1 && s1max && (s1[clib_strnlen (s1, s1max)] != '\0')) +
1105 (s2 && s2max && (s2[clib_strnlen (s2, s2max)] != '\0'));
1106 if (PREDICT_FALSE (bad != 0))
1109 clib_c11_violation ("s1 NULL");
1111 clib_c11_violation ("s2 NULL");
1113 clib_c11_violation ("s1max 0");
1115 clib_c11_violation ("s2max 0");
1117 clib_c11_violation ("substring NULL");
1118 if (s1 && s1max && (s1[clib_strnlen (s1, s1max)] != '\0'))
1119 clib_c11_violation ("s1 unterminated");
1120 if (s2 && s2max && (s2[clib_strnlen (s2, s2max)] != '\0'))
1121 clib_c11_violation ("s2 unterminated");
1126 * s2 points to a string with zero length, or s2 equals s1, return s1
1128 if (PREDICT_FALSE (*s2 == '\0' || s1 == s2))
1135 * s2_size > s1_size, it won't find match.
1137 s1_size = clib_strnlen (s1, s1max);
1138 s2_size = clib_strnlen (s2, s2max);
1139 if (PREDICT_FALSE (s2_size > s1_size))
1142 *substring = strstr (s1, s2);
1143 if (*substring == 0)
1149 #endif /* included_clib_string_h */
1152 * fd.io coding-style-patch-verification: ON
1155 * eval: (c-set-style "gnu")