DateFormatter.c

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/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include "Config.h"
 
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
 
#include "DateFormatter.h"
 
#define _Class _DateFormatter
 
#pragma mark - DateFormatter
 
static Date *dateFromCharacters(const DateFormatter *self, const char *chars) {
 
#if defined(_WIN32)
  fprintf(stderr, "WARNING: %s: not implemented (Windows)\n", __func__);
#else
  if (chars) {
    struct tm time;
 
    const char *res = strptime(chars, self->fmt, &time);
    if (res) {
      const Time t = { .tv_sec = mktime(&time) };
      return $(alloc(Date), initWithTime, &t);
    }
  }
#endif
 
  return NULL;
}
 
static Date *dateFromString(const DateFormatter *self, const String *string) {
 
  if (string) {
    return $(self, dateFromCharacters, string->chars);
  }
 
  return NULL;
}
 
static DateFormatter *initWithFormat(DateFormatter *self, const char *fmt) {
 
  self = (DateFormatter *) super(Object, self, init);
  if (self) {
    self->fmt = fmt ?: DATEFORMAT_ISO8601;
  }
 
  return self;
}
 
static String *stringFromDate(const DateFormatter *self, const Date *date) {
 
  const time_t seconds = date->time.tv_sec;
  struct tm time;
 
#if defined(_WIN32)
  int err = localtime_s(&time, &seconds);
  assert(err == 0);
#else
  ident res = localtime_r(&seconds, &time);
  assert(res == &time);
#endif
 
  char *str = calloc(1024, sizeof(char));
  assert(str);
 
  const size_t length = strftime(str, 1024, self->fmt, &time);
  str = realloc(str, length + 1 * sizeof(char));
  assert(str);
 
  return $(alloc(String), initWithMemory, str, length);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((DateFormatterInterface *) clazz->interface)->dateFromCharacters = dateFromCharacters;
  ((DateFormatterInterface *) clazz->interface)->dateFromString = dateFromString;
  ((DateFormatterInterface *) clazz->interface)->initWithFormat = initWithFormat;
  ((DateFormatterInterface *) clazz->interface)->stringFromDate = stringFromDate;
 
  tzset();
}
 
Class *_DateFormatter(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "DateFormatter",
      .superclass = _Object(),
      .instanceSize = sizeof(DateFormatter),
      .interfaceOffset = offsetof(DateFormatter, interface),
      .interfaceSize = sizeof(DateFormatterInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class