DateStrings.h

/*
 * MIT License
 * Copyright (c) 2018 Brian T. Park
 */
 
#ifndef ACE_TIME_COMMON_DATE_STRINGS_H
#define ACE_TIME_COMMON_DATE_STRINGS_H
 
#include <stdint.h>
#include <string.h>
#include "../../zoneinfo/compat.h" // strncpy_P()
 
namespace ace_time {
 
class DateStrings {
  public:
    static const uint8_t kBufferSize = 10;
 
    static const uint8_t kShortNameLength = 3;
 
    const char* monthLongString(uint8_t month) {
      uint8_t index = (month < kNumMonthNames) ? month : 0;
      strncpy_P(mBuffer, getStringAt(kMonthNames, index), kBufferSize);
      mBuffer[kBufferSize - 1] = '\0';
      return mBuffer;
    }
 
    const char* monthShortString(uint8_t month) {
      uint8_t index = (month < kNumMonthNames) ? month : 0;
      strncpy_P(mBuffer, getStringAt(kMonthNames, index), kShortNameLength);
      mBuffer[kShortNameLength] = '\0';
      return mBuffer;
    }
 
    const char* dayOfWeekLongString(uint8_t dayOfWeek) {
      uint8_t index = (dayOfWeek < kNumDayOfWeekNames) ? dayOfWeek : 0;
      strncpy_P(mBuffer, getStringAt(kDayOfWeekNames, index), kBufferSize);
      mBuffer[kBufferSize - 1] = '\0';
      return mBuffer;
    }
 
    const char* dayOfWeekShortString(uint8_t dayOfWeek) {
      uint8_t index = (dayOfWeek < kNumDayOfWeekNames) ? dayOfWeek : 0;
      strncpy_P(mBuffer, getStringAt(kDayOfWeekNames, index), kShortNameLength);
      mBuffer[kShortNameLength] = '\0';
      return mBuffer;
    }
 
  private:
    static const char* getStringAt(const char* const* strings, uint8_t i) {
      return (const char*) pgm_read_ptr(&strings[i]);
    }
 
    static const char * const kDayOfWeekNames[];
    static const char * const kMonthNames[];
    static const uint8_t kNumDayOfWeekNames;
    static const uint8_t kNumMonthNames;
 
    char mBuffer[kBufferSize];
};
 
}
 
#endif