The-Powder-Toy/src/update.c

/**
 * Powder Toy - Update Helper
 *
 * Copyright (c) 2008 - 2010 Stanislaw Skowronek.
 * Copyright (c) 2010 Simon Robertshaw
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 */

#include <stdio.h>
#ifndef MACOSX
#include <malloc.h>
#endif
#include <string.h>

#ifdef WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <sys/stat.h>
#endif
#ifdef MACOSX
#include <mach-o/dyld.h>
#include <errno.h>
#include <sys/param.h>
#endif

#include <update.h>

char *exe_name(void)
{
#if defined WIN32
	char *name= (char *)malloc(64), max=64, res;
	while ((res = (char)GetModuleFileName(NULL, name, max)) >= max)
	{
#elif defined MACOSX
	char *fn=malloc(64),*name=malloc(PATH_MAX), max=64, res;
	if (_NSGetExecutablePath(fn, &max) != 0)
	{
		fn = realloc(fn, max);
		_NSGetExecutablePath(fn, &max);
	}
	if (realpath(fn, name) == NULL)
	{
		free(fn);
		free(name);
		return NULL;
	}
	res = 1;
#else
	char fn[64], *name=malloc(64), max=64, res;
	sprintf(fn, "/proc/self/exe");
	memset(name, 0, max);
	while ((res = readlink(fn, name, max)) >= max-1)
	{
#endif
#ifndef MACOSX
		max *= 2;
		name = realloc(name, max);
		memset(name, 0, max);
	}
#endif
	if (res <= 0)
	{
		free(name);
		return NULL;
	}
	return name;
}

int update_start(char *data, int len)
{
	char *self=exe_name(), *temp;
#ifdef WIN32
	char *p;
#endif
	FILE *f;
	int res = 1;

	if (!self)
		return 1;

#ifdef WIN32
	temp = malloc(strlen(self)+12);
	strcpy(temp, self);
	p = temp + strlen(temp) - 4;
	if (_stricmp(p, ".exe"))
		p += 4;
	strcpy(p, "_update.exe");

	if (!MoveFile(self, temp))
		goto fail;

	f = fopen(self, "wb");
	if (!f)
		goto fail;
	if (fwrite(data, 1, len, f) != len)
	{
		fclose(f);
		DeleteFile(self);
		goto fail;
	}
	fclose(f);

	if ((int)ShellExecute(NULL, "open", self, NULL, NULL, SW_SHOWNORMAL) <= 32)
	{
		DeleteFile(self);
		goto fail;
	}

	return 0;
#else
	temp = malloc(strlen(self)+8);
	strcpy(temp, self);
	strcat(temp, "-update");

	f = fopen(temp, "w");
	if (!f)
		goto fail;
	if (fwrite(data, 1, len, f) != len)
	{
		fclose(f);
		unlink(temp);
		goto fail;
	}
	fclose(f);

	if (chmod(temp, 0755))
	{
		unlink(temp);
		goto fail;
	}

	if (rename(temp, self))
	{
		unlink(temp);
		goto fail;
	}

	execl(self, "powder-update", NULL);
#endif

fail:
	free(temp);
	free(self);
	return res;
}

int update_finish(void)
{
#ifdef WIN32
	char *temp, *self=exe_name(), *p;
	int timeout = 60, err;

	temp = malloc(strlen(self)+12);
	strcpy(temp, self);
	p = temp + strlen(temp) - 4;
	if (_stricmp(p, ".exe"))
		p += 4;
	strcpy(p, "_update.exe");

	while (!DeleteFile(temp))
	{
		err = GetLastError();
		if (err == ERROR_FILE_NOT_FOUND)
		{
			// just as well, then
			free(temp);
			return 0;
		}
		Sleep(500);
		timeout--;
		if (timeout <= 0)
		{
			free(temp);
			return 1;
		}
	}
	free(temp);
#endif
	return 0;
}

void update_cleanup(void)
{
#ifdef WIN32
	update_finish();
#endif
}