summaryrefslogtreecommitdiffstats
path: root/osdep/io.c
blob: 260a998bad37345d42bf5f5a254c3917156fd54e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
/*
 * unicode/utf-8 I/O helpers and wrappers for Windows
 *
 * Contains parts based on libav code (http://libav.org).
 *
 * This file is part of mpv.
 *
 * 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 <unistd.h>
#include <errno.h>
#include <assert.h>

#include "mpv_talloc.h"

#include "config.h"
#include "osdep/io.h"
#include "osdep/terminal.h"

// Set the CLOEXEC flag on the given fd.
// On error, false is returned (and errno set).
bool mp_set_cloexec(int fd)
{
#if defined(F_SETFD)
    if (fd >= 0) {
        int flags = fcntl(fd, F_GETFD);
        if (flags == -1)
            return false;
        if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
            return false;
    }
#endif
    return true;
}

#ifdef __MINGW32__
int mp_make_cloexec_pipe(int pipes[2])
{
    pipes[0] = pipes[1] = -1;
    return -1;
}
#else
int mp_make_cloexec_pipe(int pipes[2])
{
    if (pipe(pipes) != 0) {
        pipes[0] = pipes[1] = -1;
        return -1;
    }

    for (int i = 0; i < 2; i++)
        mp_set_cloexec(pipes[i]);
    return 0;
}
#endif

#ifdef __MINGW32__
int mp_make_wakeup_pipe(int pipes[2])
{
    return mp_make_cloexec_pipe(pipes);
}
#else
// create a pipe, and set it to non-blocking (and also set FD_CLOEXEC)
int mp_make_wakeup_pipe(int pipes[2])
{
    if (mp_make_cloexec_pipe(pipes) < 0)
        return -1;

    for (int i = 0; i < 2; i++) {
        int val = fcntl(pipes[i], F_GETFL) | O_NONBLOCK;
        fcntl(pipes[i], F_SETFL, val);
    }
    return 0;
}
#endif

void mp_flush_wakeup_pipe(int pipe_end)
{
#ifndef __MINGW32__
    char buf[100];
    (void)read(pipe_end, buf, sizeof(buf));
#endif
}

#ifdef _WIN32

#include <windows.h>
#include <wchar.h>
#include <stdio.h>
#include <stddef.h>

//copied and modified from libav
//http://git.libav.org/?p=libav.git;a=blob;f=libavformat/os_support.c;h=a0fcd6c9ba2be4b0dbcc476f6c53587345cc1152;hb=HEADl30

wchar_t *mp_from_utf8(void *talloc_ctx, const char *s)
{
    int count = MultiByteToWideChar(CP_UTF8, 0, s, -1, NULL, 0);
    if (count <= 0)
        abort();
    wchar_t *ret = talloc_array(talloc_ctx, wchar_t, count);
    MultiByteToWideChar(CP_UTF8, 0, s, -1, ret, count);
    return ret;
}

char *mp_to_utf8(void *talloc_ctx, const wchar_t *s)
{
    int count = WideCharToMultiByte(CP_UTF8, 0, s, -1, NULL, 0, NULL, NULL);
    if (count <= 0)
        abort();
    char *ret = talloc_array(talloc_ctx, char, count);
    WideCharToMultiByte(CP_UTF8, 0, s, -1, ret, count, NULL, NULL);
    return ret;
}

#endif // _WIN32

#ifdef __MINGW32__

#include <io.h>
#include <fcntl.h>
#include <pthread.h>

static void copy_stat(struct mp_stat *dst, struct _stat64 *src)
{
    dst->st_dev = src->st_dev;
    dst->st_ino = src->st_ino;
    dst->st_mode = src->st_mode;
    dst->st_nlink = src->st_nlink;
    dst->st_uid = src->st_uid;
    dst->st_gid = src->st_gid;
    dst->st_rdev = src->st_rdev;
    dst->st_size = src->st_size;
    dst->st_atime = src->st_atime;
    dst->st_mtime = src->st_mtime;
    dst->st_ctime = src->st_ctime;
}

int mp_stat(const char *path, struct mp_stat *buf)
{
    struct _stat64 buf_;
    wchar_t *wpath = mp_from_utf8(NULL, path);
    int res = _wstat64(wpath, &buf_);
    talloc_free(wpath);
    copy_stat(buf, &buf_);
    return res;
}

int mp_fstat(int fd, struct mp_stat *buf)
{
    struct _stat64 buf_;
    int res = _fstat64(fd, &buf_);
    copy_stat(buf, &buf_);
    return res;
}

static int mp_check_console(HANDLE wstream)
{
    if (wstream != INVALID_HANDLE_VALUE) {
        unsigned int filetype = GetFileType(wstream);

        if (!((filetype == FILE_TYPE_UNKNOWN) &&
            (GetLastError() != ERROR_SUCCESS)))
        {
            filetype &= ~(FILE_TYPE_REMOTE);

            if (filetype == FILE_TYPE_CHAR) {
                DWORD ConsoleMode;
                int ret = GetConsoleMode(wstream, &ConsoleMode);

                if (!(!ret && (GetLastError() == ERROR_INVALID_HANDLE))) {
                    // This seems to be a console
                    return 1;
                }
            }
        }
    }

    return 0;
}

static int mp_vfprintf(FILE *stream, const char *format, va_list args)
{
    int done = 0;

    HANDLE wstream = INVALID_HANDLE_VALUE;

    if (stream == stdout || stream == stderr) {
        wstream = GetStdHandle(stream == stdout ?
                               STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
    }

    if (mp_check_console(wstream)) {
        size_t len = vsnprintf(NULL, 0, format, args) + 1;
        char *buf = talloc_array(NULL, char, len);

        if (buf) {
            done = vsnprintf(buf, len, format, args);
            mp_write_console_ansi(wstream, buf);
        }
        talloc_free(buf);
    } else {
        done = vfprintf(stream, format, args);
    }

    return done;
}

int mp_fprintf(FILE *stream, const char *format, ...)
{
    int res;
    va_list args;
    va_start(args, format);
    res = mp_vfprintf(stream, format, args);
    va_end(args);
    return res;
}

int mp_printf(const char *format, ...)
{
    int res;
    va_list args;
    va_start(args, format);
    res = mp_vfprintf(stdout, format, args);
    va_end(args);
    return res;
}

int mp_open(const char *filename, int oflag, ...)
{
    int mode = 0;
    if (oflag & _O_CREAT) {
        va_list va;
        va_start(va, oflag);
        mode = va_arg(va, int);
        va_end(va);
    }
    wchar_t *wpath = mp_from_utf8(NULL, filename);
    int res = _wopen(wpath, oflag, mode);
    talloc_free(wpath);
    return res;
}

int mp_creat(const char *filename, int mode)
{
    return open(filename, O_CREAT|O_WRONLY|O_TRUNC, mode);
}

FILE *mp_fopen(const char *filename, const char *mode)
{
    wchar_t *wpath = mp_from_utf8(NULL, filename);
    wchar_t *wmode = mp_from_utf8(wpath, mode);
    FILE *res = _wfopen(wpath, wmode);
    talloc_free(wpath);
    return res;
}

// Windows' MAX_PATH/PATH_MAX/FILENAME_MAX is fixed to 260, but this limit
// applies to unicode paths encoded with wchar_t (2 bytes on Windows). The UTF-8
// version could end up bigger in memory. In the worst case each wchar_t is
// encoded to 3 bytes in UTF-8, so in the worst case we have:
//      wcslen(wpath) * 3 <= strlen(utf8path)
// Thus we need MP_PATH_MAX as the UTF-8/char version of PATH_MAX.
// Also make sure there's free space for the terminating \0.
// (For codepoints encoded as UTF-16 surrogate pairs, UTF-8 has the same length.)
#define MP_PATH_MAX (FILENAME_MAX * 3 + 1)

struct mp_dir {
    DIR crap;   // must be first member
    _WDIR *wdir;
    union {
        struct dirent dirent;
        // dirent has space only for FILENAME_MAX bytes. _wdirent has space for
        // FILENAME_MAX wchar_t, which might end up bigger as UTF-8 in some
        // cases. Guarantee we can always hold _wdirent.d_name converted to
        // UTF-8 (see MP_PATH_MAX).
        // This works because dirent.d_name is the last member of dirent.
        char space[MP_PATH_MAX];
    };
};

DIR* mp_opendir(const char *path)
{
    wchar_t *wpath = mp_from_utf8(NULL, path);
    _WDIR *wdir = _wopendir(wpath);
    talloc_free(wpath);
    if (!wdir)
        return NULL;
    struct mp_dir *mpdir = talloc(NULL, struct mp_dir);
    // DIR is supposed to be opaque, but unfortunately the MinGW headers still
    // define it. Make sure nobody tries to use it.
    memset(&mpdir->crap, 0xCD, sizeof(mpdir->crap));
    mpdir->wdir = wdir;
    return (DIR*)mpdir;
}

struct dirent* mp_readdir(DIR *dir)
{
    struct mp_dir *mpdir = (struct mp_dir*)dir;
    struct _wdirent *wdirent = _wreaddir(mpdir->wdir);
    if (!wdirent)
        return NULL;
    size_t buffersize = sizeof(mpdir->space) - offsetof(struct dirent, d_name);
    WideCharToMultiByte(CP_UTF8, 0, wdirent->d_name, -1, mpdir->dirent.d_name,
                        buffersize, NULL, NULL);
    mpdir->dirent.d_ino = 0;
    mpdir->dirent.d_reclen = 0;
    mpdir->dirent.d_namlen = strlen(mpdir->dirent.d_name);
    return &mpdir->dirent;
}

int mp_closedir(DIR *dir)
{
    struct mp_dir *mpdir = (struct mp_dir*)dir;
    int res = _wclosedir(mpdir->wdir);
    talloc_free(mpdir);
    return res;
}

int mp_mkdir(const char *path, int mode)
{
    wchar_t *wpath = mp_from_utf8(NULL, path);
    int res = _wmkdir(wpath);
    talloc_free(wpath);
    return res;
}

char *mp_win32_getcwd(char *buf, size_t size)
{
    if (size >= SIZE_MAX / 3 - 1) {
        errno = ENOMEM;
        return NULL;
    }
    size_t wbuffer = size * 3 + 1;
    wchar_t *wres = talloc_array(NULL, wchar_t, wbuffer);
    DWORD wlen = GetFullPathNameW(L".", wbuffer, wres, NULL);
    if (wlen >= wbuffer || wlen == 0) {
        talloc_free(wres);
        errno = wlen ? ERANGE : ENOENT;
        return NULL;
    }
    char *t = mp_to_utf8(NULL, wres);
    talloc_free(wres);
    size_t st = strlen(t);
    if (st >= size) {
        talloc_free(t);
        errno = ERANGE;
        return NULL;
    }
    memcpy(buf, t, st + 1);
    talloc_free(t);
    return buf;
}

FILE *mp_tmpfile(void)
{
    // Reserve a file name in the format %TMP%\mpvXXXX.TMP
    wchar_t tmp_path[MAX_PATH + 1];
    if (!GetTempPathW(MAX_PATH + 1, tmp_path))
        return NULL;
    wchar_t tmp_name[MAX_PATH + 1];
    if (!GetTempFileNameW(tmp_path, L"mpv", 0, tmp_name))
        return NULL;

    // Create the file. FILE_ATTRIBUTE_TEMPORARY indicates the file will be
    // short-lived. Windows should avoid flushing it to disk while there is
    // sufficient cache.
    HANDLE file = CreateFileW(tmp_name, GENERIC_READ | GENERIC_WRITE | DELETE,
        FILE_SHARE_READ | FILE_SHARE_DELETE, NULL, CREATE_ALWAYS,
        FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE, NULL);
    if (file == INVALID_HANDLE_VALUE) {
        DeleteFileW(tmp_name);
        return NULL;
    }

    int fd = _open_osfhandle((intptr_t)file, 0);
    if (fd < 0) {
        CloseHandle(file);
        return NULL;
    }
    FILE *fp = fdopen(fd, "w+b");
    if (!fp) {
        close(fd);
        return NULL;
    }

    return fp;
}

static char **utf8_environ;
static void *utf8_environ_ctx;

static void free_env(void)
{
    talloc_free(utf8_environ_ctx);
    utf8_environ_ctx = NULL;
    utf8_environ = NULL;
}

// Note: UNIX getenv() returns static strings, and we try to do the same. Since
// using putenv() is not multithreading safe, we don't expect env vars to change
// at runtime, and converting/allocating them in advance is ok.
static void init_getenv(void)
{
    if (utf8_environ_ctx)
        return;
    wchar_t *wenv = GetEnvironmentStringsW();
    if (!wenv)
        return;
    utf8_environ_ctx = talloc_new(NULL);
    int num_env = 0;
    while (1) {
        size_t len = wcslen(wenv);
        if (!len)
            break;
        char *s = mp_to_utf8(utf8_environ_ctx, wenv);
        MP_TARRAY_APPEND(utf8_environ_ctx, utf8_environ, num_env, s);
        wenv += len + 1;
    }
    MP_TARRAY_APPEND(utf8_environ_ctx, utf8_environ, num_env, NULL);
    // Avoid showing up in leak detectors etc.
    atexit(free_env);
}

char *mp_getenv(const char *name)
{
    static pthread_once_t once_init_getenv = PTHREAD_ONCE_INIT;
    pthread_once(&once_init_getenv, init_getenv);
    // Copied from musl, http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
    // Copyright © 2005-2013 Rich Felker, standard MIT license
    int i;
    size_t l = strlen(name);
    if (!utf8_environ || !*name || strchr(name, '=')) return NULL;
    for (i=0; utf8_environ[i] && (strncmp(name, utf8_environ[i], l)
            || utf8_environ[i][l] != '='); i++) {}
    if (utf8_environ[i]) return utf8_environ[i] + l+1;
    return NULL;
}

off_t mp_lseek(int fd, off_t offset, int whence)
{
    HANDLE h = (HANDLE)_get_osfhandle(fd);
    if (h != INVALID_HANDLE_VALUE && GetFileType(h) != FILE_TYPE_DISK) {
        errno = ESPIPE;
        return (off_t)-1;
    }
    return _lseeki64(fd, offset, whence);
}

// Limited mmap() wrapper, inspired by:
// http://code.google.com/p/mman-win32/source/browse/trunk/mman.c

void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
    assert(addr == NULL); // not implemented
    assert(flags == MAP_SHARED); // not implemented

    HANDLE osf = (HANDLE)_get_osfhandle(fd);
    if (!osf) {
        errno = EBADF;
        return MAP_FAILED;
    }

    DWORD protect = 0;
    DWORD access = 0;
    if (prot & PROT_WRITE) {
        protect = PAGE_READWRITE;
        access = FILE_MAP_WRITE;
    } else if (prot & PROT_READ) {
        protect = PAGE_READONLY;
        access = FILE_MAP_READ;
    }

    DWORD l_low = (uint32_t)length;
    DWORD l_high = ((uint64_t)length) >> 32;
    HANDLE map = CreateFileMapping(osf, NULL, protect, l_high, l_low, NULL);

    if (!map) {
        errno = EACCES; // something random
        return MAP_FAILED;
    }

    DWORD o_low = (uint32_t)offset;
    DWORD o_high = ((uint64_t)offset) >> 32;
    void *p = MapViewOfFile(map, access, o_high, o_low, length);

    CloseHandle(map);

    if (!p) {
        errno = EINVAL;
        return MAP_FAILED;
    }
    return p;
}

int munmap(void *addr, size_t length)
{
    UnmapViewOfFile(addr);
    return 0;
}

int msync(void *addr, size_t length, int flags)
{
    FlushViewOfFile(addr, length);
    return 0;
}

#endif // __MINGW32__