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//===-- sanitizer_libc.cc -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries. See sanitizer_libc.h for details.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_libc.h"
namespace __sanitizer {
s64 internal_atoll(const char *nptr) {
return internal_simple_strtoll(nptr, (char**)0, 10);
}
void *internal_memchr(const void *s, int c, uptr n) {
const char* t = (char*)s;
for (uptr i = 0; i < n; ++i, ++t)
if (*t == c)
return (void*)t;
return 0;
}
int internal_memcmp(const void* s1, const void* s2, uptr n) {
const char* t1 = (char*)s1;
const char* t2 = (char*)s2;
for (uptr i = 0; i < n; ++i, ++t1, ++t2)
if (*t1 != *t2)
return *t1 < *t2 ? -1 : 1;
return 0;
}
void *internal_memcpy(void *dest, const void *src, uptr n) {
char *d = (char*)dest;
char *s = (char*)src;
for (uptr i = 0; i < n; ++i)
d[i] = s[i];
return dest;
}
void *internal_memset(void* s, int c, uptr n) {
// The next line prevents Clang from making a call to memset() instead of the
// loop below.
// FIXME: building the runtime with -ffreestanding is a better idea. However
// there currently are linktime problems due to PR12396.
char volatile *t = (char*)s;
for (uptr i = 0; i < n; ++i, ++t) {
*t = c;
}
return s;
}
char* internal_strdup(const char *s) {
uptr len = internal_strlen(s);
char *s2 = (char*)InternalAlloc(len + 1);
internal_memcpy(s2, s, len);
s2[len] = 0;
return s2;
}
int internal_strcmp(const char *s1, const char *s2) {
while (true) {
unsigned c1 = *s1;
unsigned c2 = *s2;
if (c1 != c2) return (c1 < c2) ? -1 : 1;
if (c1 == 0) break;
s1++;
s2++;
}
return 0;
}
int internal_strncmp(const char *s1, const char *s2, uptr n) {
for (uptr i = 0; i < n; i++) {
unsigned c1 = *s1;
unsigned c2 = *s2;
if (c1 != c2) return (c1 < c2) ? -1 : 1;
if (c1 == 0) break;
s1++;
s2++;
}
return 0;
}
char* internal_strchr(const char *s, int c) {
while (true) {
if (*s == (char)c)
return (char*)s;
if (*s == 0)
return 0;
s++;
}
}
char *internal_strrchr(const char *s, int c) {
const char *res = 0;
for (uptr i = 0; s[i]; i++) {
if (s[i] == c) res = s + i;
}
return (char*)res;
}
uptr internal_strlen(const char *s) {
uptr i = 0;
while (s[i]) i++;
return i;
}
char *internal_strncat(char *dst, const char *src, uptr n) {
uptr len = internal_strlen(dst);
uptr i;
for (i = 0; i < n && src[i]; i++)
dst[len + i] = src[i];
dst[len + i] = 0;
return dst;
}
char *internal_strncpy(char *dst, const char *src, uptr n) {
uptr i;
for (i = 0; i < n && src[i]; i++)
dst[i] = src[i];
for (; i < n; i++)
dst[i] = '\0';
return dst;
}
uptr internal_strnlen(const char *s, uptr maxlen) {
uptr i = 0;
while (i < maxlen && s[i]) i++;
return i;
}
char *internal_strstr(const char *haystack, const char *needle) {
// This is O(N^2), but we are not using it in hot places.
uptr len1 = internal_strlen(haystack);
uptr len2 = internal_strlen(needle);
if (len1 < len2) return 0;
for (uptr pos = 0; pos <= len1 - len2; pos++) {
if (internal_memcmp(haystack + pos, needle, len2) == 0)
return (char*)haystack + pos;
}
return 0;
}
s64 internal_simple_strtoll(const char *nptr, char **endptr, int base) {
CHECK_EQ(base, 10);
while (IsSpace(*nptr)) nptr++;
int sgn = 1;
u64 res = 0;
bool have_digits = false;
char *old_nptr = (char*)nptr;
if (*nptr == '+') {
sgn = 1;
nptr++;
} else if (*nptr == '-') {
sgn = -1;
nptr++;
}
while (IsDigit(*nptr)) {
res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
int digit = ((*nptr) - '0');
res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
have_digits = true;
nptr++;
}
if (endptr != 0) {
*endptr = (have_digits) ? (char*)nptr : old_nptr;
}
if (sgn > 0) {
return (s64)(Min((u64)INT64_MAX, res));
} else {
return (res > INT64_MAX) ? INT64_MIN : ((s64)res * -1);
}
}
} // namespace __sanitizer
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