1 //===-- sanitizer_libc.cc -------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries. See sanitizer_libc.h for details.
12 //===----------------------------------------------------------------------===//
14 #include "sanitizer_allocator_internal.h"
15 #include "sanitizer_common.h"
16 #include "sanitizer_libc.h"
18 namespace __sanitizer {
20 s64 internal_atoll(const char *nptr) {
21 return internal_simple_strtoll(nptr, nullptr, 10);
24 void *internal_memchr(const void *s, int c, uptr n) {
25 const char *t = (const char *)s;
26 for (uptr i = 0; i < n; ++i, ++t)
28 return reinterpret_cast<void *>(const_cast<char *>(t));
32 void *internal_memrchr(const void *s, int c, uptr n) {
33 const char *t = (const char *)s;
35 for (uptr i = 0; i < n; ++i, ++t) {
36 if (*t == c) res = reinterpret_cast<void *>(const_cast<char *>(t));
41 int internal_memcmp(const void* s1, const void* s2, uptr n) {
42 const char *t1 = (const char *)s1;
43 const char *t2 = (const char *)s2;
44 for (uptr i = 0; i < n; ++i, ++t1, ++t2)
46 return *t1 < *t2 ? -1 : 1;
50 void *internal_memcpy(void *dest, const void *src, uptr n) {
51 char *d = (char*)dest;
52 const char *s = (const char *)src;
53 for (uptr i = 0; i < n; ++i)
58 void *internal_memmove(void *dest, const void *src, uptr n) {
59 char *d = (char*)dest;
60 const char *s = (const char *)src;
61 sptr i, signed_n = (sptr)n;
62 CHECK_GE(signed_n, 0);
64 for (i = 0; i < signed_n; ++i)
67 if (d > s && signed_n > 0)
68 for (i = signed_n - 1; i >= 0 ; --i) {
75 // Semi-fast bzero for 16-aligned data. Still far from peak performance.
76 void internal_bzero_aligned16(void *s, uptr n) {
77 struct ALIGNED(16) S16 { u64 a, b; };
78 CHECK_EQ((reinterpret_cast<uptr>(s) | n) & 15, 0);
79 for (S16 *p = reinterpret_cast<S16*>(s), *end = p + n / 16; p < end; p++) {
81 // Make sure this does not become memset.
82 SanitizerBreakOptimization(nullptr);
86 void *internal_memset(void* s, int c, uptr n) {
87 // The next line prevents Clang from making a call to memset() instead of the
89 // FIXME: building the runtime with -ffreestanding is a better idea. However
90 // there currently are linktime problems due to PR12396.
91 char volatile *t = (char*)s;
92 for (uptr i = 0; i < n; ++i, ++t) {
98 uptr internal_strcspn(const char *s, const char *reject) {
100 for (i = 0; s[i]; i++) {
101 if (internal_strchr(reject, s[i]))
107 char* internal_strdup(const char *s) {
108 uptr len = internal_strlen(s);
109 char *s2 = (char*)InternalAlloc(len + 1);
110 internal_memcpy(s2, s, len);
115 char* internal_strndup(const char *s, uptr n) {
116 uptr len = internal_strnlen(s, n);
117 char *s2 = (char*)InternalAlloc(len + 1);
118 internal_memcpy(s2, s, len);
123 int internal_strcmp(const char *s1, const char *s2) {
127 if (c1 != c2) return (c1 < c2) ? -1 : 1;
135 int internal_strncmp(const char *s1, const char *s2, uptr n) {
136 for (uptr i = 0; i < n; i++) {
139 if (c1 != c2) return (c1 < c2) ? -1 : 1;
147 char* internal_strchr(const char *s, int c) {
150 return const_cast<char *>(s);
157 char *internal_strchrnul(const char *s, int c) {
158 char *res = internal_strchr(s, c);
160 res = const_cast<char *>(s) + internal_strlen(s);
164 char *internal_strrchr(const char *s, int c) {
165 const char *res = nullptr;
166 for (uptr i = 0; s[i]; i++) {
167 if (s[i] == c) res = s + i;
169 return const_cast<char *>(res);
172 uptr internal_strlen(const char *s) {
178 uptr internal_strlcat(char *dst, const char *src, uptr maxlen) {
179 const uptr srclen = internal_strlen(src);
180 const uptr dstlen = internal_strnlen(dst, maxlen);
181 if (dstlen == maxlen) return maxlen + srclen;
182 if (srclen < maxlen - dstlen) {
183 internal_memmove(dst + dstlen, src, srclen + 1);
185 internal_memmove(dst + dstlen, src, maxlen - dstlen - 1);
186 dst[maxlen - 1] = '\0';
188 return dstlen + srclen;
191 char *internal_strncat(char *dst, const char *src, uptr n) {
192 uptr len = internal_strlen(dst);
194 for (i = 0; i < n && src[i]; i++)
195 dst[len + i] = src[i];
200 uptr internal_strlcpy(char *dst, const char *src, uptr maxlen) {
201 const uptr srclen = internal_strlen(src);
202 if (srclen < maxlen) {
203 internal_memmove(dst, src, srclen + 1);
204 } else if (maxlen != 0) {
205 internal_memmove(dst, src, maxlen - 1);
206 dst[maxlen - 1] = '\0';
211 char *internal_strncpy(char *dst, const char *src, uptr n) {
213 for (i = 0; i < n && src[i]; i++)
215 internal_memset(dst + i, '\0', n - i);
219 uptr internal_strnlen(const char *s, uptr maxlen) {
221 while (i < maxlen && s[i]) i++;
225 char *internal_strstr(const char *haystack, const char *needle) {
226 // This is O(N^2), but we are not using it in hot places.
227 uptr len1 = internal_strlen(haystack);
228 uptr len2 = internal_strlen(needle);
229 if (len1 < len2) return nullptr;
230 for (uptr pos = 0; pos <= len1 - len2; pos++) {
231 if (internal_memcmp(haystack + pos, needle, len2) == 0)
232 return const_cast<char *>(haystack) + pos;
237 uptr internal_wcslen(const wchar_t *s) {
243 s64 internal_simple_strtoll(const char *nptr, char **endptr, int base) {
245 while (IsSpace(*nptr)) nptr++;
248 bool have_digits = false;
249 char *old_nptr = const_cast<char *>(nptr);
253 } else if (*nptr == '-') {
257 while (IsDigit(*nptr)) {
258 res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
259 int digit = ((*nptr) - '0');
260 res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
265 *endptr = (have_digits) ? const_cast<char *>(nptr) : old_nptr;
268 return (s64)(Min((u64)INT64_MAX, res));
270 return (res > INT64_MAX) ? INT64_MIN : ((s64)res * -1);
274 bool mem_is_zero(const char *beg, uptr size) {
275 CHECK_LE(size, 1ULL << FIRST_32_SECOND_64(30, 40)); // Sanity check.
276 const char *end = beg + size;
277 uptr *aligned_beg = (uptr *)RoundUpTo((uptr)beg, sizeof(uptr));
278 uptr *aligned_end = (uptr *)RoundDownTo((uptr)end, sizeof(uptr));
281 for (const char *mem = beg; mem < (char*)aligned_beg && mem < end; mem++)
284 for (; aligned_beg < aligned_end; aligned_beg++)
287 if ((char*)aligned_end >= beg)
288 for (const char *mem = (char*)aligned_end; mem < end; mem++)
293 } // namespace __sanitizer