mirror of
https://github.com/mpv-player/mpv
synced 2024-12-18 04:45:33 +00:00
303 lines
8.2 KiB
C
303 lines
8.2 KiB
C
/*
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* Path utility functions
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include "config.h"
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#include "mpv_talloc.h"
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#include "common/common.h"
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#include "osdep/io.h"
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#include "misc/ctype.h"
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#include "misc/path_utils.h"
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#if HAVE_DOS_PATHS
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#include <windows.h>
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#include <pathcch.h>
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#endif
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char *mp_basename(const char *path)
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{
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char *s;
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#if HAVE_DOS_PATHS
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if (!mp_is_url(bstr0(path))) {
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s = strrchr(path, '\\');
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if (s)
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path = s + 1;
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s = strrchr(path, ':');
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if (s)
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path = s + 1;
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}
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#endif
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s = strrchr(path, '/');
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return s ? s + 1 : (char *)path;
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}
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struct bstr mp_dirname(const char *path)
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{
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struct bstr ret = {
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(uint8_t *)path, mp_basename(path) - path
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};
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if (ret.len == 0)
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return bstr0(".");
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return ret;
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}
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#if HAVE_DOS_PATHS
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static const char mp_path_separators[] = "\\/";
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#else
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static const char mp_path_separators[] = "/";
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#endif
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// Mutates path and removes a trailing '/' (or '\' on Windows)
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void mp_path_strip_trailing_separator(char *path)
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{
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size_t len = strlen(path);
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if (len > 0 && strchr(mp_path_separators, path[len - 1]))
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path[len - 1] = '\0';
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}
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char *mp_splitext(const char *path, bstr *root)
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{
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assert(path);
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int skip = (*path == '.'); // skip leading dot for "hidden" unix files
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const char *split = strrchr(path + skip, '.');
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if (!split || !split[1] || strchr(split, '/'))
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return NULL;
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if (root)
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*root = (bstr){(char *)path, split - path};
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return (char *)split + 1;
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}
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bool mp_path_is_absolute(struct bstr path)
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{
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if (path.len && strchr(mp_path_separators, path.start[0]))
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return true;
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#if HAVE_DOS_PATHS
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// Note: "X:filename" is a path relative to the current working directory
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// of drive X, and thus is not an absolute path. It needs to be
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// followed by \ or /.
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if (path.len >= 3 && path.start[1] == ':' &&
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strchr(mp_path_separators, path.start[2]))
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return true;
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#endif
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return false;
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}
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char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
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{
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if (p1.len == 0)
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return bstrdup0(talloc_ctx, p2);
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if (p2.len == 0)
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return bstrdup0(talloc_ctx, p1);
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if (mp_path_is_absolute(p2))
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return bstrdup0(talloc_ctx, p2);
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bool have_separator = strchr(mp_path_separators, p1.start[p1.len - 1]);
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#if HAVE_DOS_PATHS
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// "X:" only => path relative to "X:" current working directory.
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if (p1.len == 2 && p1.start[1] == ':')
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have_separator = true;
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#endif
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return talloc_asprintf(talloc_ctx, "%.*s%s%.*s", BSTR_P(p1),
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have_separator ? "" : "/", BSTR_P(p2));
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}
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char *mp_path_join(void *talloc_ctx, const char *p1, const char *p2)
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{
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return mp_path_join_bstr(talloc_ctx, bstr0(p1), bstr0(p2));
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}
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char *mp_getcwd(void *talloc_ctx)
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{
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char *e_wd = getenv("PWD");
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if (e_wd)
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return talloc_strdup(talloc_ctx, e_wd);
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char *wd = talloc_array(talloc_ctx, char, 20);
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while (getcwd(wd, talloc_get_size(wd)) == NULL) {
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if (errno != ERANGE) {
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talloc_free(wd);
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return NULL;
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}
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wd = talloc_realloc(talloc_ctx, wd, char, talloc_get_size(wd) * 2);
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}
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return wd;
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}
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char *mp_normalize_path(void *talloc_ctx, const char *path)
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{
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assert(talloc_ctx && "mp_normalize_path requires talloc_ctx!");
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if (!path)
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return NULL;
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if (mp_is_url(bstr0(path)))
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return talloc_strdup(talloc_ctx, path);
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if (!mp_path_is_absolute(bstr0(path))) {
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char *cwd = mp_getcwd(talloc_ctx);
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if (!cwd)
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return NULL;
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path = mp_path_join(talloc_ctx, cwd, path);
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}
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#if HAVE_DOS_PATHS
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wchar_t *pathw = mp_from_utf8(NULL, path);
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wchar_t *read = pathw, *write = pathw;
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wchar_t prev = '\0';
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// preserve leading double backslashes
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if (read[0] == '\\' && read[1] == '\\') {
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prev = '\\';
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write += 2;
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read += 2;
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}
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wchar_t curr;
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while ((curr = *read)) {
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if (curr == '/')
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curr = '\\';
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if (curr != '\\' || prev != '\\')
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*write++ = curr;
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prev = curr;
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read++;
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}
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*write = '\0';
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size_t max_size = wcslen(pathw) + 1;
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wchar_t *pathc = talloc_array(NULL, wchar_t, max_size);
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HRESULT hr = PathCchCanonicalizeEx(pathc, max_size, pathw, PATHCCH_ALLOW_LONG_PATHS);
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char *ret = SUCCEEDED(hr) ? mp_to_utf8(talloc_ctx, pathc) : talloc_strdup(talloc_ctx, path);
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talloc_free(pathw);
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talloc_free(pathc);
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return ret;
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#else
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char *result = talloc_strdup(talloc_ctx, "");
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const char *next;
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const char *end = path + strlen(path);
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for (const char *ptr = path; ptr < end; ptr = next + 1) {
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next = memchr(ptr, '/', end - ptr);
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if (next == NULL)
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next = end;
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switch (next - ptr) {
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case 0:
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continue;
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case 1:
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if (ptr[0] == '.')
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continue;
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break;
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case 2:
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// Normalizing symlink/.. results in a wrong path: if the
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// current working directory is /tmp/foo, and it is a symlink to
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// /usr/bin, mpv ../file.mkv opens /usr/file.mkv, so we can't
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// normalize the path to /tmp/file.mkv. Resolve symlinks to fix
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// this. Otherwise we don't use realpath so users can use
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// symlinks e.g. to hide how media files are distributed over
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// real storage and move them while still resuming playback as
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// long as the symlinked path doesn't change.
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if (ptr[0] == '.' && ptr[1] == '.') {
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char *tmp_result = realpath(path, NULL);
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result = talloc_strdup(talloc_ctx, tmp_result);
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free(tmp_result);
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return result;
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}
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}
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result = talloc_strdup_append_buffer(result, "/");
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result = talloc_strndup_append_buffer(result, ptr, next - ptr);
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}
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return result;
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#endif
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}
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bool mp_path_exists(const char *path)
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{
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struct stat st;
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return path && stat(path, &st) == 0;
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}
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bool mp_path_isdir(const char *path)
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{
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struct stat st;
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return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
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}
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// Return false if it's considered a normal local filesystem path.
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bool mp_is_url(bstr path)
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{
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int proto = bstr_find0(path, "://");
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if (proto < 1)
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return false;
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// Per RFC3986, the first character of the protocol must be alphabetic.
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// The rest must be alphanumeric plus -, + and .
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for (int i = 0; i < proto; i++) {
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unsigned char c = path.start[i];
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if ((i == 0 && !mp_isalpha(c)) ||
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(!mp_isalnum(c) && c != '.' && c != '-' && c != '+'))
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{
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return false;
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}
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}
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return true;
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}
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// Return the protocol part of path, e.g. "http" if path is "http://...".
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// On success, out_url (if not NULL) is set to the part after the "://".
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bstr mp_split_proto(bstr path, bstr *out_url)
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{
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if (!mp_is_url(path))
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return (bstr){0};
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bstr r;
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bstr_split_tok(path, "://", &r, out_url ? out_url : &(bstr){0});
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return r;
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}
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void mp_mkdirp(const char *dir)
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{
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char *path = talloc_strdup(NULL, dir);
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char *cdir = path + 1;
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while (cdir) {
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cdir = strchr(cdir, '/');
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if (cdir)
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*cdir = 0;
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mkdir(path, 0700);
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if (cdir)
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*cdir++ = '/';
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}
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talloc_free(path);
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}
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