hanchenye-llvm-project/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_defs.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_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_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