String is getting mysteriously knackered
Hi, I am trying to write a program to open zzt files, but I have come across a problem which I don't understand.
If I printf the world.title string before I have called load_board it works fine, but if I try and printf it after load_board has been called it crashes. This makes me think that the load_board function is crapping over the world.title string, but I can't see where its touching it at all!
Code:
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
/* unsigned short int c; / Two byte thingy */
/* unsigned char d; / One byte thingy */
/* Map structure */
struct Sworld
{
int board_count;
int start_board;
int start_ammo;
int start_gems;
int start_health;
int start_torches;
int torch_cycles_left;
int energiser_cycles_left;
bool blue_key;
bool green_key;
bool cyan_key;
bool red_key;
bool purple_key;
bool yellow_key;
bool white_key;
int start_score;
char *title;
int time_left;
bool saved_game;
};
/* Tile structure */
struct Stile
{
char code;
char colour;
};
/* Board Structure */
struct Sboard
{
char *title;
char *message;
struct Stile tile[1500];
int object_count;
int maximum_shots_fired;
int time_limit;
int board_north;
int board_south;
int board_west;
int board_east;
bool dark;
bool teleport_when_hurt;
};
/* Functions */
bool load_world(char *file_name);
void load_board(FILE *file_pointer);
/* Variables */
struct Sworld world;
struct Sboard board;
int main(int argc, char *argv[])
{
if (load_world("BOB.ZZT") == false)
printf("Cock up loading map\n");
/* if (load_world("SAVED.SAV") == false)
printf("Cock up loading map\n"); */
printf("map title: %s\n", world.title);
if (world.saved_game == true)
printf("Its a saved game\n");
else
printf("Its not a saved game\n");
system("PAUSE");
free(world.title);
return 0;
}
bool load_world(char *file_name)
{
FILE *file_pointer;
char buffer[512]; /* Header goes here */
int i, title_length;
file_pointer = fopen(file_name, "r");
if (file_pointer == NULL)
{
printf("FAILED opening world file: %s\n", file_name);
system("PAUSE");
return false;
}
else
printf("Opened world file: %s\n", file_name);
for (i = 0; i < 512; i++)
buffer[i] = getc(file_pointer);
world.board_count = (unsigned short)buffer[2] + buffer[3] * 256;
world.start_ammo = (unsigned short)buffer[4] + buffer[5] * 256;
world.start_gems = (unsigned short)buffer[6] + buffer[7] * 256;
world.blue_key = buffer[8];
world.green_key = buffer[9];
world.cyan_key = buffer[10];
world.red_key = buffer[11];
world.purple_key = buffer[12];
world.yellow_key = buffer[13];
world.white_key = buffer[14];
world.start_health = (unsigned short)buffer[15] + buffer[16] * 256;
world.start_board = (unsigned short)buffer[17] + buffer[18] * 256;
world.start_torches = (unsigned short)buffer[19] + buffer[20] * 256;
world.torch_cycles_left = (unsigned short)buffer[21] + buffer[22] * 256;
world.energiser_cycles_left = (unsigned short)buffer[23] + buffer[24] * 256;
world.start_score = (unsigned short)buffer[27] + buffer[28] * 256;
title_length = buffer[29];
world.title = malloc(title_length + 1);
for (i = 0; i < title_length; i++)
world.title[i] = buffer[30 + i];
world.title[i] = '\0';
world.saved_game = buffer[264];
printf("Board Count: %d\n",world.board_count);
printf("Loaded world: %s\n", world.title);
load_board(file_pointer);
fclose(file_pointer);
return true;
}
void load_board(FILE *file_pointer)
{
char *buffer;
int i, board_size, title_length;
int current_tile = 0;
/* Read the board into the buffer */
buffer = malloc(53);
for (i = 0; i < 53; i++)
buffer[i] = getc(file_pointer);
/* Get the board size */
board_size = (unsigned short)buffer[0] + buffer[1] * 256;
/* Get the title */
title_length = buffer[2];
board.title = malloc(title_length + 1);
for (i = 0; i < title_length; i++)
board.title[i] = buffer[3 + i];
board.title[i] = '\0';
free(buffer);
printf("Board title: %s\n", board.title);
buffer = malloc(3);
/* Get all the tiles put into the board.tile array */
while (current_tile < 1500)
{
for (i = 0; i < 3; i++)
buffer[i] = getc(file_pointer);
printf("Repeat amount: %d\n",buffer[0]);
printf("Code: %d\n",buffer[1]);
printf("Colour: %d\n",buffer[2]);
for (i = 0; i < buffer[0]; i++)
{
board.tile[current_tile + i].code = buffer[1];
board.tile[current_tile + i].colour = buffer[2];
current_tile++;
}
printf("Current_tile: %d\n",current_tile);
system("PAUSE");
}
free(board.title);
free(buffer);
}
