myrtl.cpp

#include "stdafx.h"
#include "myrtl.h"

#ifdef __cplusplus
namespace crt
{
  extern "C"
  {
#endif /* __cplusplus */
    void* my_malloc(size_t size)
    {
      return HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY, size);
    }

    void* my_realloc(void* block, size_t size)
    {
      if (block)
        return HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY, block, size);
      return HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY, size);
    }

    void my_free(void* block)
    {
      HeapFree(GetProcessHeap(), 0, block);
    }

    void* my_memcpy(void* dest, const void* src, size_t n)
    {
      size_t i;
      for (i = 0; i < n; i++) static_cast<unsigned char *>(dest)[i] = static_cast<const unsigned char *>(src)[i];
      return dest;
    }

    char* my_strdup(const char* src)
    {
      int size = lstrlenA(src) + 1;
      char* str = static_cast<char*>(my_malloc(size));
      if (str)
        my_memcpy(str, src, size);
      return str;
    }

    wchar_t* my_strdupW(const wchar_t* src)
    {
      int size = (lstrlen(src) + 1) * sizeof(wchar_t);
      wchar_t* str = static_cast<wchar_t*>(my_malloc(size));
      if (str)
        my_memcpy(str, src, size);
      return str;
    }

    void* my_memset(void* s, int c, size_t n)
    {
      size_t i;
      for (i = 0; i < n; i++) static_cast<char *>(s)[i] = c;
      return s;
    }

    int my_strncmp(const char* s1, const char* s2, size_t maxlen)
    {
      if (!maxlen)
        return (0);
      while (--maxlen && *s1 && *s1 == *s2)
      {
        s1++;
        s2++;
      }
      return (*s1 - *s2);
    }


    const char* my_strchr(const char* s, int c)
    {
      while (*s)
      {
        if (*s == c)
          return s;
        s++;
      }
      return nullptr;
    }

    const char* my_strrchr(const char* s, int c)
    {
      register const char* ss;
      register size_t i;

      for (i = lstrlenA(s) + 1 , ss = s + i; i; i--)
      {
        if (*--ss == static_cast<char>(c)) return const_cast<char *>(ss);
      }
      return nullptr;
    }

#ifdef __cplusplus
  }
}
#endif /* __cplusplus */