/* misc.c */
#include "misc.h"
+#include <stdio.h> /* for rename() */
+#include <unistd.h> /* for unlink(), acess() */
#include <stdlib.h> /* for calloc(), free() */
#include <string.h> /* for strlen(), strcmp(), memcpy() */
#include <stdint.h> /* for uint8_t */
extern void save_game(struct World * world)
{
- char * err_msg = "Error saving game.";
-
- FILE * file = fopen("savefile", "w");
- exit_err(0 == file, world, err_msg);
-
- uint8_t err;
- err = write_uint32_bigendian(world->seed, file);
- err = err | write_uint32_bigendian(world->turn, file);
- err = err | write_uint16_bigendian(world->player->pos.y + 1, file);
- err = err | write_uint16_bigendian(world->player->pos.x + 1, file);
- err = err | write_uint8(world->player->hitpoints, file);
- err = err | write_map_objects(world, world->monster, file);
- err = err | write_map_objects(world, world->item, file);
- exit_err(err, world, err_msg);
- fclose(file);
+ char * savefile_tmp = "savefile_tmp";
+ char * savefile = "savefile";
+ FILE * file = fopen(savefile_tmp, "w");
+ exit_err(0 == file, world, "Error saving game: "
+ "Unable to open new savefile for writing.");
+ if ( write_uint32_bigendian(world->seed, file)
+ || write_uint32_bigendian(world->turn, file)
+ || write_uint16_bigendian(world->player->pos.y + 1, file)
+ || write_uint16_bigendian(world->player->pos.x + 1, file)
+ || write_uint8(world->player->hitpoints, file)
+ || write_map_objects(world, world->monster, file)
+ || write_map_objects(world, world->item, file))
+ {
+ exit_err(1, world, "Error saving game: "
+ "Trouble writing to opened new savefile.");
+ }
+ exit_err(fclose(file), world, "Error saving game: "
+ "Unable to close opened new savefile.");
+ if (!access(savefile, F_OK))
+ {
+ exit_err(unlink(savefile), world, "Error saving game: "
+ "Unable to unlink old savefile.");
+ }
+ exit_err(rename(savefile_tmp, "savefile"), world, "Error saving game: "
+ "Unable to rename 'savefile_tmp' to 'savefile'.");
}