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mpv/options/path.c

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/*
* This file is part of mpv.
*
* Get path to config dir/file.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "config.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/path.h"
#include "mpv_talloc.h"
#include "osdep/io.h"
#include "osdep/path.h"
#include "misc/ctype.h"
// In order of decreasing priority: the first has highest priority.
static const mp_get_platform_path_cb path_resolvers[] = {
#if HAVE_COCOA
mp_get_platform_path_osx,
#endif
#if HAVE_DARWIN
mp_get_platform_path_darwin,
#elif !defined(_WIN32) || defined(__CYGWIN__)
mp_get_platform_path_unix,
#endif
#if HAVE_UWP
mp_get_platform_path_uwp,
#elif defined(_WIN32)
mp_get_platform_path_win,
#endif
};
// from highest (most preferred) to lowest priority
static const char *const config_dirs[] = {
"home",
"old_home",
"osxbundle",
"exe_dir",
"global",
};
// Return a platform specific path using a path type as defined in osdep/path.h.
// Keep in mind that the only way to free the return value is freeing talloc_ctx
// (or its children), as this function can return a statically allocated string.
static const char *mp_get_platform_path(void *talloc_ctx,
struct mpv_global *global,
const char *type)
{
assert(talloc_ctx);
if (global->configdir) {
// force all others to NULL, only first returns the path
for (int n = 0; n < MP_ARRAY_SIZE(config_dirs); n++) {
if (strcmp(config_dirs[n], type) == 0)
return (n == 0 && global->configdir[0]) ? global->configdir : NULL;
}
}
// Return the native config path if the platform doesn't support the
// type we are trying to fetch.
const char *fallback_type = NULL;
if (!strcmp(type, "cache") || !strcmp(type, "state"))
fallback_type = "home";
for (int n = 0; n < MP_ARRAY_SIZE(path_resolvers); n++) {
const char *path = path_resolvers[n](talloc_ctx, type);
if (path && path[0])
return path;
}
if (fallback_type) {
assert(strcmp(fallback_type, type) != 0);
return mp_get_platform_path(talloc_ctx, global, fallback_type);
}
return NULL;
}
void mp_init_paths(struct mpv_global *global, struct MPOpts *opts)
{
TA_FREEP(&global->configdir);
const char *force_configdir = getenv("MPV_HOME");
if (opts->force_configdir && opts->force_configdir[0])
force_configdir = opts->force_configdir;
if (!opts->load_config)
force_configdir = "";
global->configdir = talloc_strdup(global, force_configdir);
}
char *mp_find_user_file(void *talloc_ctx, struct mpv_global *global,
const char *type, const char *filename)
{
void *tmp = talloc_new(NULL);
char *res = (char *)mp_get_platform_path(tmp, global, type);
if (res)
res = mp_path_join(talloc_ctx, res, filename);
talloc_free(tmp);
MP_DBG(global, "%s path: '%s' -> '%s'\n", type, filename, res ? res : "-");
return res;
}
static char **mp_find_all_config_files_limited(void *talloc_ctx,
struct mpv_global *global,
int max_files,
const char *filename)
{
char **ret = talloc_array(talloc_ctx, char*, 2); // 2 preallocated
int num_ret = 0;
for (int i = 0; i < MP_ARRAY_SIZE(config_dirs); i++) {
const char *dir = mp_get_platform_path(ret, global, config_dirs[i]);
bstr s = bstr0(filename);
while (dir && num_ret < max_files && s.len) {
bstr fn;
bstr_split_tok(s, "|", &fn, &s);
char *file = mp_path_join_bstr(ret, bstr0(dir), fn);
if (mp_path_exists(file)) {
MP_DBG(global, "config path: '%.*s' -> '%s'\n",
BSTR_P(fn), file);
MP_TARRAY_APPEND(NULL, ret, num_ret, file);
} else {
MP_DBG(global, "config path: '%.*s' -/-> '%s'\n",
BSTR_P(fn), file);
}
}
}
MP_TARRAY_GROW(NULL, ret, num_ret);
ret[num_ret] = NULL;
for (int n = 0; n < num_ret / 2; n++)
MPSWAP(char*, ret[n], ret[num_ret - n - 1]);
return ret;
}
char **mp_find_all_config_files(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
return mp_find_all_config_files_limited(talloc_ctx, global, 64, filename);
}
char *mp_find_config_file(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
char **l = mp_find_all_config_files_limited(talloc_ctx, global, 1, filename);
char *r = l && l[0] ? talloc_steal(talloc_ctx, l[0]) : NULL;
talloc_free(l);
return r;
}
char *mp_get_user_path(void *talloc_ctx, struct mpv_global *global,
const char *path)
{
if (!path)
return NULL;
char *res = NULL;
bstr bpath = bstr0(path);
if (bstr_eatstart0(&bpath, "~")) {
// parse to "~" <prefix> "/" <rest>
bstr prefix, rest;
if (bstr_split_tok(bpath, "/", &prefix, &rest)) {
const char *rest0 = rest.start; // ok in this case
if (bstr_equals0(prefix, "~")) {
res = mp_find_config_file(talloc_ctx, global, rest0);
if (!res) {
void *tmp = talloc_new(NULL);
const char *p = mp_get_platform_path(tmp, global, "home");
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
} else if (bstr_equals0(prefix, "")) {
char *home = getenv("HOME");
if (!home)
home = getenv("USERPROFILE");
res = mp_path_join_bstr(talloc_ctx, bstr0(home), rest);
} else if (bstr_eatstart0(&prefix, "~")) {
void *tmp = talloc_new(NULL);
char type[80];
snprintf(type, sizeof(type), "%.*s", BSTR_P(prefix));
const char *p = mp_get_platform_path(tmp, global, type);
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
}
}
if (!res)
res = talloc_strdup(talloc_ctx, path);
MP_DBG(global, "user path: '%s' -> '%s'\n", path, res);
return res;
}
char *mp_basename(const char *path)
{
char *s;
#if HAVE_DOS_PATHS
if (!mp_is_url(bstr0(path))) {
s = strrchr(path, '\\');
if (s)
path = s + 1;
s = strrchr(path, ':');
if (s)
path = s + 1;
}
#endif
s = strrchr(path, '/');
return s ? s + 1 : (char *)path;
}
struct bstr mp_dirname(const char *path)
{
struct bstr ret = {
(uint8_t *)path, mp_basename(path) - path
};
if (ret.len == 0)
return bstr0(".");
return ret;
}
#if HAVE_DOS_PATHS
static const char mp_path_separators[] = "\\/";
#else
static const char mp_path_separators[] = "/";
#endif
// Mutates path and removes a trailing '/' (or '\' on Windows)
void mp_path_strip_trailing_separator(char *path)
{
size_t len = strlen(path);
if (len > 0 && strchr(mp_path_separators, path[len - 1]))
path[len - 1] = '\0';
}
char *mp_splitext(const char *path, bstr *root)
{
assert(path);
int skip = (*path == '.'); // skip leading dot for "hidden" unix files
const char *split = strrchr(path + skip, '.');
if (!split || !split[1] || strchr(split, '/'))
return NULL;
if (root)
*root = (bstr){(char *)path, split - path};
return (char *)split + 1;
}
bool mp_path_is_absolute(struct bstr path)
{
if (path.len && strchr(mp_path_separators, path.start[0]))
return true;
#if HAVE_DOS_PATHS
// Note: "X:filename" is a path relative to the current working directory
// of drive X, and thus is not an absolute path. It needs to be
// followed by \ or /.
if (path.len >= 3 && path.start[1] == ':' &&
strchr(mp_path_separators, path.start[2]))
return true;
#endif
return false;
}
char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
{
if (p1.len == 0)
return bstrdup0(talloc_ctx, p2);
if (p2.len == 0)
return bstrdup0(talloc_ctx, p1);
if (mp_path_is_absolute(p2))
return bstrdup0(talloc_ctx, p2);
bool have_separator = strchr(mp_path_separators, p1.start[p1.len - 1]);
#if HAVE_DOS_PATHS
// "X:" only => path relative to "X:" current working directory.
if (p1.len == 2 && p1.start[1] == ':')
have_separator = true;
#endif
return talloc_asprintf(talloc_ctx, "%.*s%s%.*s", BSTR_P(p1),
have_separator ? "" : "/", BSTR_P(p2));
}
char *mp_path_join(void *talloc_ctx, const char *p1, const char *p2)
{
return mp_path_join_bstr(talloc_ctx, bstr0(p1), bstr0(p2));
}
char *mp_getcwd(void *talloc_ctx)
{
char *e_wd = getenv("PWD");
if (e_wd)
return talloc_strdup(talloc_ctx, e_wd);
char *wd = talloc_array(talloc_ctx, char, 20);
while (getcwd(wd, talloc_get_size(wd)) == NULL) {
if (errno != ERANGE) {
talloc_free(wd);
return NULL;
}
wd = talloc_realloc(talloc_ctx, wd, char, talloc_get_size(wd) * 2);
}
return wd;
}
char *mp_normalize_path(void *talloc_ctx, const char *path)
{
if (mp_is_url(bstr0(path)))
return talloc_strdup(talloc_ctx, path);
return mp_path_join(talloc_ctx, mp_getcwd(talloc_ctx), path);
}
bool mp_path_exists(const char *path)
{
struct stat st;
return path && stat(path, &st) == 0;
}
bool mp_path_isdir(const char *path)
{
struct stat st;
return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
}
// Return false if it's considered a normal local filesystem path.
bool mp_is_url(bstr path)
{
int proto = bstr_find0(path, "://");
if (proto < 1)
return false;
// Per RFC3986, the first character of the protocol must be alphabetic.
// The rest must be alphanumeric plus -, + and .
for (int i = 0; i < proto; i++) {
unsigned char c = path.start[i];
if ((i == 0 && !mp_isalpha(c)) ||
(!mp_isalnum(c) && c != '.' && c != '-' && c != '+'))
{
return false;
}
}
return true;
}
// Return the protocol part of path, e.g. "http" if path is "http://...".
// On success, out_url (if not NULL) is set to the part after the "://".
bstr mp_split_proto(bstr path, bstr *out_url)
{
if (!mp_is_url(path))
return (bstr){0};
bstr r;
bstr_split_tok(path, "://", &r, out_url ? out_url : &(bstr){0});
return r;
}
void mp_mkdirp(const char *dir)
{
char *path = talloc_strdup(NULL, dir);
char *cdir = path + 1;
while (cdir) {
cdir = strchr(cdir, '/');
if (cdir)
*cdir = 0;
mkdir(path, 0700);
if (cdir)
*cdir++ = '/';
}
talloc_free(path);
}
void mp_mk_user_dir(struct mpv_global *global, const char *type, char *subdir)
{
char *dir = mp_find_user_file(NULL, global, type, subdir);
if (dir)
mp_mkdirp(dir);
talloc_free(dir);
}
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