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misc.c
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/*
* Copyright 2008-2013 Various Authors
* Copyright 2004-2005 Timo Hirvonen
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "misc.h"
#include "prog.h"
#include "xmalloc.h"
#include "xstrjoin.h"
#include "ui_curses.h"
#include "config/libdir.h"
#include "config/datadir.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdarg.h>
#include <pwd.h>
const char *cmus_config_dir = NULL;
const char *cmus_playlist_dir = NULL;
const char *cmus_socket_path = NULL;
const char *cmus_data_dir = NULL;
const char *cmus_lib_dir = NULL;
const char *home_dir = NULL;
char **get_words(const char *text)
{
char **words;
int i, j, count;
while (*text == ' ')
text++;
count = 0;
i = 0;
while (text[i]) {
count++;
while (text[i] && text[i] != ' ')
i++;
while (text[i] == ' ')
i++;
}
words = xnew(char *, count + 1);
i = 0;
j = 0;
while (text[i]) {
int start = i;
while (text[i] && text[i] != ' ')
i++;
words[j++] = xstrndup(text + start, i - start);
while (text[i] == ' ')
i++;
}
words[j] = NULL;
return words;
}
int strptrcmp(const void *a, const void *b)
{
const char *as = *(char **)a;
const char *bs = *(char **)b;
return strcmp(as, bs);
}
int strptrcoll(const void *a, const void *b)
{
const char *as = *(char **)a;
const char *bs = *(char **)b;
return strcoll(as, bs);
}
const char *escape(const char *str)
{
static char *buf = NULL;
static size_t alloc = 0;
size_t len = strlen(str);
size_t need = len * 2 + 1;
int s, d;
if (need > alloc) {
alloc = (need + 16) & ~(16 - 1);
buf = xrealloc(buf, alloc);
}
d = 0;
for (s = 0; str[s]; s++) {
if (str[s] == '\\') {
buf[d++] = '\\';
buf[d++] = '\\';
continue;
}
if (str[s] == '\n') {
buf[d++] = '\\';
buf[d++] = 'n';
continue;
}
buf[d++] = str[s];
}
buf[d] = 0;
return buf;
}
const char *unescape(const char *str)
{
static char *buf = NULL;
static size_t alloc = 0;
size_t need = strlen(str) + 1;
int do_escape = 0;
int s, d;
if (need > alloc) {
alloc = (need + 16) & ~(16 - 1);
buf = xrealloc(buf, alloc);
}
d = 0;
for (s = 0; str[s]; s++) {
if (!do_escape && str[s] == '\\')
do_escape = 1;
else {
buf[d++] = (do_escape && str[s] == 'n') ? '\n' : str[s];
do_escape = 0;
}
}
buf[d] = 0;
return buf;
}
static int dir_exists(const char *dirname)
{
DIR *dir;
dir = opendir(dirname);
if (dir == NULL) {
if (errno == ENOENT)
return 0;
return -1;
}
closedir(dir);
return 1;
}
static void make_dir(const char *dirname)
{
int rc;
rc = dir_exists(dirname);
if (rc == 1)
return;
if (rc == -1)
die_errno("error: opening `%s'", dirname);
rc = mkdir(dirname, 0700);
if (rc == -1)
die_errno("error: creating directory `%s'", dirname);
}
static char *get_non_empty_env(const char *name)
{
const char *val;
val = getenv(name);
if (val == NULL || val[0] == 0)
return NULL;
return xstrdup(val);
}
const char *get_filename(const char *path)
{
const char *file = strrchr(path, '/');
if (!file)
file = path;
else
file++;
if (!*file)
return NULL;
return file;
}
static void move_old_playlist(void)
{
char *default_playlist = xstrjoin(cmus_playlist_dir, "/default");
char *old_playlist = xstrjoin(cmus_config_dir, "/playlist.pl");
int rc = rename(old_playlist, default_playlist);
if (rc && errno != ENOENT)
die_errno("error: unable to move %s to playlist directory",
old_playlist);
free(default_playlist);
free(old_playlist);
}
int misc_init(void)
{
char *xdg_runtime_dir = get_non_empty_env("XDG_RUNTIME_DIR");
home_dir = get_non_empty_env("HOME");
if (home_dir == NULL)
die("error: environment variable HOME not set\n");
cmus_config_dir = get_non_empty_env("CMUS_HOME");
if (cmus_config_dir == NULL) {
char *cmus_home = xstrjoin(home_dir, "/.cmus");
int cmus_home_exists = dir_exists(cmus_home);
if (cmus_home_exists == 1) {
cmus_config_dir = xstrdup(cmus_home);
} else if (cmus_home_exists == -1) {
die_errno("error: opening `%s'", cmus_home);
} else {
char *xdg_config_home = get_non_empty_env("XDG_CONFIG_HOME");
if (xdg_config_home == NULL) {
xdg_config_home = xstrjoin(home_dir, "/.config");
}
make_dir(xdg_config_home);
cmus_config_dir = xstrjoin(xdg_config_home, "/cmus");
free(xdg_config_home);
}
free(cmus_home);
}
make_dir(cmus_config_dir);
cmus_playlist_dir = get_non_empty_env("CMUS_PLAYLIST_DIR");
if (!cmus_playlist_dir)
cmus_playlist_dir = xstrjoin(cmus_config_dir, "/playlists");
int playlist_dir_is_new = dir_exists(cmus_playlist_dir) == 0;
make_dir(cmus_playlist_dir);
if (playlist_dir_is_new)
move_old_playlist();
cmus_socket_path = get_non_empty_env("CMUS_SOCKET");
if (cmus_socket_path == NULL) {
if (xdg_runtime_dir == NULL) {
cmus_socket_path = xstrjoin(cmus_config_dir, "/socket");
} else {
cmus_socket_path = xstrjoin(xdg_runtime_dir, "/cmus-socket");
}
}
cmus_lib_dir = getenv("CMUS_LIB_DIR");
if (!cmus_lib_dir)
cmus_lib_dir = LIBDIR "/cmus";
cmus_data_dir = getenv("CMUS_DATA_DIR");
if (!cmus_data_dir)
cmus_data_dir = DATADIR "/cmus";
free(xdg_runtime_dir);
return 0;
}
int replaygain_decode(unsigned int field, int *gain)
{
unsigned int name_code, originator_code, sign_bit, val;
name_code = (field >> 13) & 0x7;
if (!name_code || name_code > 2)
return 0;
originator_code = (field >> 10) & 0x7;
if (!originator_code)
return 0;
sign_bit = (field >> 9) & 0x1;
val = field & 0x1ff;
if (sign_bit && !val)
return 0;
*gain = (sign_bit ? -1 : 1) * val;
return name_code;
}
static char *get_home_dir(const char *username)
{
struct passwd *passwd;
if (username == NULL)
return xstrdup(home_dir);
passwd = getpwnam(username);
if (passwd == NULL)
return NULL;
/* don't free passwd */
return xstrdup(passwd->pw_dir);
}
char *expand_filename(const char *name)
{
if (name[0] == '~') {
char *slash;
slash = strchr(name, '/');
if (slash) {
char *username, *home;
if (slash - name - 1 > 0) {
/* ~user/... */
username = xstrndup(name + 1, slash - name - 1);
} else {
/* ~/... */
username = NULL;
}
home = get_home_dir(username);
free(username);
if (home) {
char *expanded;
expanded = xstrjoin(home, slash);
free(home);
return expanded;
} else {
return xstrdup(name);
}
} else {
if (name[1] == 0) {
return xstrdup(home_dir);
} else {
char *home;
home = get_home_dir(name + 1);
if (home)
return home;
return xstrdup(name);
}
}
} else {
return xstrdup(name);
}
}
void shuffle_array(void *array, size_t n, size_t size)
{
char tmp[size];
char *arr = array;
for (ssize_t i = 0; i < (ssize_t)n - 1; ++i) {
size_t rnd = (size_t) rand();
size_t j = i + rnd / (RAND_MAX / (n - i) + 1);
memcpy(tmp, arr + j * size, size);
memcpy(arr + j * size, arr + i * size, size);
memcpy(arr + i * size, tmp, size);
}
}