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/*
* Copyright (c) 2026 Benjamin Linskey <contact@linskey.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <pwd.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include "pathnames.h"
#include "rogue.h"
#define XDG_DIR "rogue"
#define DOTFILE_DIR ".rogue"
#define SCORE_FILE "scores"
static char *get_prog_dir_path(void);
static char *get_score_path(void);
static int ensure_prog_dir(void);
/*
* Opens the score file for reading and writing and returns a file pointer.
* Returns NULL on error.
*/
FILE *
open_score_file(void) {
if (ensure_prog_dir() == -1) {
printf("Failed to ensure directory\n");
return NULL;
}
char *path = get_score_path();
FILE *fp = fopen(path, "r+");
if (!fp && errno == ENOENT) {
fp = fopen(path, "w+");
}
free(path);
if (!fp) {
printf("Failed to open file %s\n", path);
}
return fp;
}
/*
* Returns the path to the program data directory. The caller is responsible
* for freeing the returned memory.
*/
static
char *
get_prog_dir_path(void) {
/*
* Use $XDG_DATA_HOME if defined, or the user's home directory
* otherwise.
*/
char *data_dir = getenv("XDG_DATA_HOME");
char *dir;
if (data_dir) {
dir = XDG_DIR;
} else {
dir = DOTFILE_DIR;
data_dir = getenv("HOME");
if (!data_dir) {
data_dir = getpwuid(getuid())->pw_dir;
}
}
size_t len = strlen(data_dir) + strlen(dir) + 1;
bool add_slash = false;
if (data_dir[strlen(data_dir) - 1] != '/') {
len += 1;
add_slash = true;
}
char *buf = malloc(len);
strlcpy(buf, data_dir, len);
if (add_slash) {
strlcat(buf, "/", len);
}
strlcat(buf, dir, len);
return buf;
}
/*
* Returns the path to the score file. The caller is repsonsible for freeing
* the returned memory.
*/
static
char *
get_score_path(void)
{
char *dir = get_prog_dir_path();
// Account for slash after directory and trailing NULL.
size_t len = strlen(dir) + strlen(SCORE_FILE) + 2;
char *buf = malloc(len);
strlcpy(buf, dir, len);
strlcat(buf, "/", len);
strlcat(buf, SCORE_FILE, len);
free(dir);
return buf;
}
/*
* Ensures that the program data directory exists. Returns 0 on success or -1
* if an error occurs.
*/
static
int
ensure_prog_dir(void) {
int ret;
char *path = get_prog_dir_path();
struct stat s = {0};
int err = stat(path, &s);
// If file does not exist, create the directory.
if (err && errno == ENOENT) {
ret = mkdir(path, 0755);
goto cleanup;
}
// If file does exist and stat() returned an error, bail out.
if (err) {
ret = err;
goto cleanup;
}
// If file is a directory, we don't need to do anything.
if (s.st_mode & S_IFDIR) {
ret = 0;
goto cleanup;
}
// File exists and isn't a directory, so return an error.
ret = -1;
goto cleanup;
cleanup:
free(path);
return ret;
}
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