Method fromHttpDate

Sming/Core/DateTime.cpp:149–234

}

bool DateTime::fromHttpDate(const String& httpDate, time_t& time)
{
	auto ptr = httpDate.c_str();

	// Parse and return a decimal number and update ptr to the first non-numeric character after it
	auto parseNumber = [&ptr]() { return strtol(ptr, const_cast<char**>(&ptr), 10); };

	auto skipWhitespace = [&ptr]() -> void {
		while(isspace(*ptr)) {
			++ptr;
		}
	};

	skipWhitespace();
	if(!isdigit(*ptr)) {
		// Don't actually use this value
		uint8_t weekday;
		if(!matchName(ptr, weekday, isoDayNames, 7)) {
			return false; // Invalid day of week
		}
		if(ptr[0] == ',') {
			// Accept "Sun,", etc.
			ptr += 2;
		} else if(strncmp(ptr, "day,", 4) == 0) {
			// Accept "Sunday, ", etc
			ptr += 5;
		} else {
			return false;
		}
	}

	skipWhitespace();
	uint8_t day = parseNumber();
	if(*ptr != '-' && !isspace(*ptr)) {
		return false;
	}
	++ptr;

	// Should we check DayOfWeek against calculation from date?
	// We could just ignore the DOW...
	skipWhitespace();
	uint8_t month;
	if(!matchName(ptr, month, isoMonthNames, 12)) {
		return false; // Invalid month
	}
	if(*ptr != '-') {
		// Skip over any other characters: assume that the full month name has been provided
		while(*ptr != '\0' && !isspace(*ptr)) {
			++ptr;
		}
		if(*ptr == '\0') {
			return false;
		}
	}
	++ptr;

	skipWhitespace();
	uint16_t year = parseNumber();