WString.h

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#ifndef STM32_WSTRING_H_
#define STM32_WSTRING_H_
 
#include <stdlib.h>
#include <string.h>
 
class String {
public:
  String(const char *s = "") : buf_(nullptr), len_(0) { assign(s); }
  String(const String &o) : buf_(nullptr), len_(0) { assign(o.buf_); }
  String &operator=(const String &o) {
    if (this != &o)
      assign(o.buf_);
    return *this;
  }
  String &operator=(const char *s) {
    assign(s);
    return *this;
  }
  ~String() { free(buf_); }
 
  const char *c_str() const { return buf_ ? buf_ : ""; }
  unsigned int length() const { return len_; }
  char operator[](unsigned int i) const { return (i < len_) ? buf_[i] : 0; }
 
private:
  void assign(const char *s) {
    free(buf_);
    buf_ = nullptr;
    len_ = 0;
    if (!s)
      return;
    len_ = (unsigned int)strlen(s);
    buf_ = (char *)malloc(len_ + 1);
    if (buf_)
      memcpy(buf_, s, len_ + 1);
    else
      len_ = 0;
  }
  char *buf_;
  unsigned int len_;
};
 
#endif // STM32_WSTRING_H_