281 lines
7.2 KiB
C++
281 lines
7.2 KiB
C++
//===-- sanitizer_libc.cpp ------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries. See sanitizer_libc.h for details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_common.h"
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#include "sanitizer_libc.h"
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namespace __sanitizer {
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s64 internal_atoll(const char *nptr) {
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return internal_simple_strtoll(nptr, nullptr, 10);
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}
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void *internal_memchr(const void *s, int c, uptr n) {
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const char *t = (const char *)s;
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for (uptr i = 0; i < n; ++i, ++t)
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if (*t == c)
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return reinterpret_cast<void *>(const_cast<char *>(t));
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return nullptr;
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}
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void *internal_memrchr(const void *s, int c, uptr n) {
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const char *t = (const char *)s;
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void *res = nullptr;
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for (uptr i = 0; i < n; ++i, ++t) {
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if (*t == c) res = reinterpret_cast<void *>(const_cast<char *>(t));
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}
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return res;
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}
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int internal_memcmp(const void* s1, const void* s2, uptr n) {
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const char *t1 = (const char *)s1;
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const char *t2 = (const char *)s2;
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for (uptr i = 0; i < n; ++i, ++t1, ++t2)
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if (*t1 != *t2)
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return *t1 < *t2 ? -1 : 1;
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return 0;
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}
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void *internal_memcpy(void *dest, const void *src, uptr n) {
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char *d = (char*)dest;
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const char *s = (const char *)src;
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for (uptr i = 0; i < n; ++i)
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d[i] = s[i];
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return dest;
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}
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void *internal_memmove(void *dest, const void *src, uptr n) {
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char *d = (char*)dest;
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const char *s = (const char *)src;
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sptr i, signed_n = (sptr)n;
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CHECK_GE(signed_n, 0);
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if (d < s) {
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for (i = 0; i < signed_n; ++i)
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d[i] = s[i];
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} else {
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if (d > s && signed_n > 0) {
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for (i = signed_n - 1; i >= 0; --i) {
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d[i] = s[i];
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}
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}
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}
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return dest;
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}
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void *internal_memset(void* s, int c, uptr n) {
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// Optimize for the most performance-critical case:
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if ((reinterpret_cast<uptr>(s) % 16) == 0 && (n % 16) == 0) {
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u64 *p = reinterpret_cast<u64*>(s);
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u64 *e = p + n / 8;
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u64 v = c;
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v |= v << 8;
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v |= v << 16;
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v |= v << 32;
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for (; p < e; p += 2)
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p[0] = p[1] = v;
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return s;
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}
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// The next line prevents Clang from making a call to memset() instead of the
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// loop below.
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// FIXME: building the runtime with -ffreestanding is a better idea. However
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// there currently are linktime problems due to PR12396.
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char volatile *t = (char*)s;
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for (uptr i = 0; i < n; ++i, ++t) {
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*t = c;
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}
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return s;
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}
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uptr internal_strcspn(const char *s, const char *reject) {
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uptr i;
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for (i = 0; s[i]; i++) {
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if (internal_strchr(reject, s[i]))
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return i;
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}
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return i;
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}
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char* internal_strdup(const char *s) {
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uptr len = internal_strlen(s);
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char *s2 = (char*)InternalAlloc(len + 1);
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internal_memcpy(s2, s, len);
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s2[len] = 0;
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return s2;
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}
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int internal_strcmp(const char *s1, const char *s2) {
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while (true) {
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unsigned c1 = *s1;
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unsigned c2 = *s2;
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if (c1 != c2) return (c1 < c2) ? -1 : 1;
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if (c1 == 0) break;
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s1++;
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s2++;
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}
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return 0;
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}
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int internal_strncmp(const char *s1, const char *s2, uptr n) {
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for (uptr i = 0; i < n; i++) {
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unsigned c1 = *s1;
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unsigned c2 = *s2;
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if (c1 != c2) return (c1 < c2) ? -1 : 1;
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if (c1 == 0) break;
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s1++;
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s2++;
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}
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return 0;
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}
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char* internal_strchr(const char *s, int c) {
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while (true) {
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if (*s == (char)c)
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return const_cast<char *>(s);
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if (*s == 0)
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return nullptr;
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s++;
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}
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}
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char *internal_strchrnul(const char *s, int c) {
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char *res = internal_strchr(s, c);
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if (!res)
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res = const_cast<char *>(s) + internal_strlen(s);
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return res;
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}
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char *internal_strrchr(const char *s, int c) {
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const char *res = nullptr;
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for (uptr i = 0; s[i]; i++) {
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if (s[i] == c) res = s + i;
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}
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return const_cast<char *>(res);
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}
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uptr internal_strlen(const char *s) {
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uptr i = 0;
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while (s[i]) i++;
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return i;
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}
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uptr internal_strlcat(char *dst, const char *src, uptr maxlen) {
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const uptr srclen = internal_strlen(src);
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const uptr dstlen = internal_strnlen(dst, maxlen);
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if (dstlen == maxlen) return maxlen + srclen;
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if (srclen < maxlen - dstlen) {
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internal_memmove(dst + dstlen, src, srclen + 1);
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} else {
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internal_memmove(dst + dstlen, src, maxlen - dstlen - 1);
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dst[maxlen - 1] = '\0';
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}
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return dstlen + srclen;
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}
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char *internal_strncat(char *dst, const char *src, uptr n) {
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uptr len = internal_strlen(dst);
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uptr i;
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for (i = 0; i < n && src[i]; i++)
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dst[len + i] = src[i];
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dst[len + i] = 0;
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return dst;
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}
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uptr internal_strlcpy(char *dst, const char *src, uptr maxlen) {
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const uptr srclen = internal_strlen(src);
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if (srclen < maxlen) {
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internal_memmove(dst, src, srclen + 1);
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} else if (maxlen != 0) {
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internal_memmove(dst, src, maxlen - 1);
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dst[maxlen - 1] = '\0';
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}
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return srclen;
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}
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char *internal_strncpy(char *dst, const char *src, uptr n) {
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uptr i;
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for (i = 0; i < n && src[i]; i++)
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dst[i] = src[i];
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internal_memset(dst + i, '\0', n - i);
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return dst;
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}
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uptr internal_strnlen(const char *s, uptr maxlen) {
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uptr i = 0;
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while (i < maxlen && s[i]) i++;
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return i;
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}
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char *internal_strstr(const char *haystack, const char *needle) {
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// This is O(N^2), but we are not using it in hot places.
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uptr len1 = internal_strlen(haystack);
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uptr len2 = internal_strlen(needle);
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if (len1 < len2) return nullptr;
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for (uptr pos = 0; pos <= len1 - len2; pos++) {
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if (internal_memcmp(haystack + pos, needle, len2) == 0)
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return const_cast<char *>(haystack) + pos;
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}
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return nullptr;
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}
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s64 internal_simple_strtoll(const char *nptr, const char **endptr, int base) {
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CHECK_EQ(base, 10);
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while (IsSpace(*nptr)) nptr++;
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int sgn = 1;
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u64 res = 0;
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bool have_digits = false;
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char *old_nptr = const_cast<char *>(nptr);
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if (*nptr == '+') {
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sgn = 1;
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nptr++;
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} else if (*nptr == '-') {
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sgn = -1;
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nptr++;
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}
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while (IsDigit(*nptr)) {
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res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
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int digit = ((*nptr) - '0');
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res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
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have_digits = true;
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nptr++;
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}
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if (endptr) {
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*endptr = (have_digits) ? const_cast<char *>(nptr) : old_nptr;
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}
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if (sgn > 0) {
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return (s64)(Min((u64)INT64_MAX, res));
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} else {
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return (res > INT64_MAX) ? INT64_MIN : ((s64)res * -1);
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}
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}
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bool mem_is_zero(const char *beg, uptr size) {
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CHECK_LE(size, 1ULL << FIRST_32_SECOND_64(30, 40)); // Sanity check.
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const char *end = beg + size;
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uptr *aligned_beg = (uptr *)RoundUpTo((uptr)beg, sizeof(uptr));
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uptr *aligned_end = (uptr *)RoundDownTo((uptr)end, sizeof(uptr));
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uptr all = 0;
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// Prologue.
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for (const char *mem = beg; mem < (char*)aligned_beg && mem < end; mem++)
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all |= *mem;
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// Aligned loop.
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for (; aligned_beg < aligned_end; aligned_beg++)
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all |= *aligned_beg;
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// Epilogue.
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if ((char *)aligned_end >= beg) {
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for (const char *mem = (char *)aligned_end; mem < end; mem++) all |= *mem;
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}
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return all == 0;
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}
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} // namespace __sanitizer
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