flibit's XDG/OSX Save and Config Folder Thing

flibitSave.c

/* XDG/OSX Save and Config Folder Thing
 * Written by Ethan "flibitijibibo" Lee
 * http://www.flibitijibibo.com/
 *
 * Released under public domain.
 * No warranty implied; use at your own risk.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>

static const char *gameName = "GameName";

/* Gets the ideal save directory for the target platform.
 * @param output A character array, ideally PATH_MAX characters long.
 *
 * Typical Usage:
 * char savePath[PATH_MAX];
 * getUserSaveDir(savePath);
 * strcat(savePath, "/save.sav");
 * FILE *saveFile = fopen(savePath, "rwb");
 */
static void getUserSaveDir(char* output)
{
#if defined(__APPLE__)
	char *homeDir = getenv("HOME");
	if (homeDir == NULL)
	{
		strcpy(output, "."); /* Oh well. */
	}
	else
	{
		strcpy(output, homeDir);
		strcat(output, "/Library/Application Support/");
		strcat(output, gameName);
		mkdir(output, 0777);
	}
#elif defined(__linux__)
	static int warnFail = 1;
	char *homeDir = getenv("XDG_DATA_HOME");
	if (homeDir == NULL)
	{
		homeDir = getenv("HOME");
		if (homeDir == NULL)
		{
			if (warnFail)
			{
				warnFail = 0;
				fprintf(stderr, "Couldn't find XDG_DATA_HOME or HOME.\n");
				fprintf(stderr, "Fall back to '.'\n");
			}
			strcpy(output, "."); /* Oh well. */
		}
		else
		{
			if (warnFail)
			{
				warnFail = 0;
				fprintf(stderr, "Couldn't find XDG_DATA_HOME.\n");
				fprintf(stderr, "Fall back to hardcoded ~/.local/share/.\n");
			}
			strcpy(output, homeDir);
			strcat(output, "/.local/share/");
			strcat(output, gameName);
			mkdir(output, 0777);
		}
	}
	else
	{
		strcpy(output, homeDir);
		strcat(output, "/");
		strcat(output, gameName);
		mkdir(output, 0777);
	}
#else
#error I need a getUserSaveDir implementation for this platform!
#endif
}

/* Gets the ideal config directory for the target platform.
 * @param output A character array, ideally PATH_MAX characters long.
 *
 * Typical Usage:
 * char configPath[PATH_MAX];
 * getUserConfigDir(configPath);
 * strcat(configPath, "/config.cfg");
 * FILE *configFile = fopen(configPath, "rw");
 */
static void getUserConfigDir(char* output)
{
#if defined(__APPLE__)
	char *homeDir = getenv("HOME");
	if (homeDir == NULL)
	{
		strcpy(output, "."); /* Oh well. */
	}
	else
	{
		strcpy(output, homeDir);
		strcat(output, "/Library/Application Support/");
		strcat(output, gameName);
		mkdir(output, 0777);
	}
#elif defined(__linux__)
	static int warnFail = 1;
	char *homeDir = getenv("XDG_CONFIG_HOME");
	if (homeDir == NULL)
	{
		homeDir = getenv("HOME");
		if (homeDir == NULL)
		{
			if (warnFail)
			{
				warnFail = 0;
				fprintf(stderr, "Couldn't find XDG_CONFIG_HOME or HOME.\n");
				fprintf(stderr, "Fall back to '.'\n");
			}
			strcpy(output, "."); /* Oh well. */
		}
		else
		{
			if (warnFail)
			{
				warnFail = 0;
				fprintf(stderr, "Couldn't find XDG_CONFIG_HOME.\n");
				fprintf(stderr, "Fall back to hardcoded ~/.config/.\n");
			}
			strcpy(output, homeDir);
			strcat(output, "/.config/");
			strcat(output, gameName);
			mkdir(output, 0777);
		}
	}
	else
	{
		strcpy(output, homeDir);
		strcat(output, "/");
		strcat(output, gameName);
		mkdir(output, 0777);
	}
#else
#error I need a getUserConfigDir implementation for this platform!
#endif
}