xref: /external/compiler-rt/lib/sanitizer_common/sanitizer_libc.cc

//===-- 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 {

void MiniLibcStub() {
}

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;
}

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_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;
}

}  // namespace __sanitizer