190 lines
4.5 KiB
C++
190 lines
4.5 KiB
C++
//===-- sanitizer_libc.cc -------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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_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, (char**)0, 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 = (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 (void*)t;
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return 0;
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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 = (char*)s1;
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const char* t2 = (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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char *s = (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_memset(void* s, int c, uptr n) {
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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]) != 0)
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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 (char*)s;
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if (*s == 0)
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return 0;
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s++;
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}
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}
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char *internal_strrchr(const char *s, int c) {
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const char *res = 0;
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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 (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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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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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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for (; i < n; i++)
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dst[i] = '\0';
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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 0;
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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 (char*)haystack + pos;
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}
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return 0;
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}
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s64 internal_simple_strtoll(const char *nptr, 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 = (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 != 0) {
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*endptr = (have_digits) ? (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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} // namespace __sanitizer
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