1 /*****************************************************************************
2 * libc.c: Extra libc function for some systems.
3 *****************************************************************************
4 * Copyright (C) 2002-2006 the VideoLAN team
7 * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
8 * Samuel Hocevar <sam@zoy.org>
9 * Gildas Bazin <gbazin@videolan.org>
10 * Derk-Jan Hartman <hartman at videolan dot org>
11 * Christophe Massiot <massiot@via.ecp.fr>
12 * Rémi Denis-Courmont <rem à videolan.org>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
27 *****************************************************************************/
32 #include <vlc_common.h>
42 #if defined(HAVE_ICONV)
53 # include <sys/time.h>
56 # include <sys/wait.h>
58 # include <sys/socket.h>
59 # include <sys/poll.h>
62 #if defined(WIN32) || defined(UNDER_CE)
67 # define WIN32_LEAN_AND_MEAN
71 /*****************************************************************************
72 * vlc_*dir_wrapper: wrapper under Windows to return the list of drive letters
73 * when called with an empty argument or just '\'
74 *****************************************************************************/
78 typedef struct vlc_DIR
82 struct _wdirent dd_dir;
86 void *vlc_wopendir( const wchar_t *wpath )
88 vlc_DIR *p_dir = NULL;
89 _WDIR *p_real_dir = NULL;
91 if ( wpath == NULL || wpath[0] == '\0'
92 || (wcscmp (wpath, L"\\") == 0) )
94 /* Special mode to list drive letters */
95 p_dir = malloc( sizeof(vlc_DIR) );
98 p_dir->p_real_dir = NULL;
100 p_dir->i_drives = NULL;
102 p_dir->i_drives = GetLogicalDrives();
104 return (void *)p_dir;
107 p_real_dir = _wopendir( wpath );
108 if ( p_real_dir == NULL )
111 p_dir = malloc( sizeof(vlc_DIR) );
114 _wclosedir( p_real_dir );
117 p_dir->p_real_dir = p_real_dir;
119 assert (wpath[0]); // wpath[1] is defined
120 p_dir->b_insert_back = !wcscmp (wpath + 1, L":\\");
121 return (void *)p_dir;
124 struct _wdirent *vlc_wreaddir( void *_p_dir )
126 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
129 if ( p_dir->p_real_dir != NULL )
131 if ( p_dir->b_insert_back )
133 /* Adds "..", gruik! */
134 p_dir->dd_dir.d_ino = 0;
135 p_dir->dd_dir.d_reclen = 0;
136 p_dir->dd_dir.d_namlen = 2;
137 wcscpy( p_dir->dd_dir.d_name, L".." );
138 p_dir->b_insert_back = false;
139 return &p_dir->dd_dir;
142 return _wreaddir( p_dir->p_real_dir );
145 /* Drive letters mode */
146 i_drives = p_dir->i_drives;
148 swprintf( p_dir->dd_dir.d_name, L"\\");
149 p_dir->dd_dir.d_namlen = wcslen(p_dir->dd_dir.d_name);
153 return NULL; /* end */
155 for ( i = 0; i < sizeof(DWORD)*8; i++, i_drives >>= 1 )
156 if ( i_drives & 1 ) break;
159 return NULL; /* this should not happen */
161 swprintf( p_dir->dd_dir.d_name, L"%c:\\", 'A' + i );
162 p_dir->dd_dir.d_namlen = wcslen(p_dir->dd_dir.d_name);
163 p_dir->i_drives &= ~(1UL << i);
165 return &p_dir->dd_dir;
168 void vlc_rewinddir( void *_p_dir )
170 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
172 if ( p_dir->p_real_dir != NULL )
173 _wrewinddir( p_dir->p_real_dir );
177 /* This one is in the libvlccore exported symbol list */
178 int vlc_wclosedir( void *_p_dir )
181 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
184 if ( p_dir->p_real_dir != NULL )
185 i_ret = _wclosedir( p_dir->p_real_dir );
190 return closedir( _p_dir );
195 * In-tree plugins share their gettext domain with LibVLC.
197 char *vlc_gettext( const char *msgid )
200 return dgettext( PACKAGE_NAME, msgid );
202 return (char *)msgid;
206 /*****************************************************************************
208 *****************************************************************************/
209 vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
211 #if defined(HAVE_ICONV)
212 return iconv_open( tocode, fromcode );
214 return (vlc_iconv_t)(-1);
218 size_t vlc_iconv( vlc_iconv_t cd, const char **inbuf, size_t *inbytesleft,
219 char **outbuf, size_t *outbytesleft )
221 #if defined(HAVE_ICONV)
222 return iconv( cd, (ICONV_CONST char **)inbuf, inbytesleft,
223 outbuf, outbytesleft );
229 int vlc_iconv_close( vlc_iconv_t cd )
231 #if defined(HAVE_ICONV)
232 return iconv_close( cd );
238 /*****************************************************************************
240 * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
241 *****************************************************************************/
242 bool vlc_ureduce( unsigned *pi_dst_nom, unsigned *pi_dst_den,
243 uint64_t i_nom, uint64_t i_den, uint64_t i_max )
255 i_gcd = GCD( i_nom, i_den );
259 if( i_max == 0 ) i_max = INT64_C(0xFFFFFFFF);
261 if( i_nom > i_max || i_den > i_max )
263 uint64_t i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
268 uint64_t i_x = i_nom / i_den;
269 uint64_t i_a2n = i_x * i_a1_num + i_a0_num;
270 uint64_t i_a2d = i_x * i_a1_den + i_a0_den;
272 if( i_a2n > i_max || i_a2d > i_max ) break;
276 i_a0_num = i_a1_num; i_a0_den = i_a1_den;
277 i_a1_num = i_a2n; i_a1_den = i_a2d;
278 if( i_nom == 0 ) break;
279 i_x = i_nom; i_nom = i_den; i_den = i_x;
291 /*************************************************************************
292 * vlc_execve: Execute an external program with a given environment,
293 * wait until it finishes and return its standard output
294 *************************************************************************/
295 int __vlc_execve( vlc_object_t *p_object, int i_argc, char *const *ppsz_argv,
296 char *const *ppsz_env, const char *psz_cwd,
297 const char *p_in, size_t i_in,
298 char **pp_data, size_t *pi_data )
300 (void)i_argc; // <-- hmph
302 # define BUFSIZE 1024
303 int fds[2], i_status;
305 if (socketpair (AF_LOCAL, SOCK_STREAM, 0, fds))
309 if ((fds[0] > 2) && (fds[1] > 2))
315 msg_Err (p_object, "unable to fork (%m)");
324 pthread_sigmask (SIG_SETMASK, &set, NULL);
327 * Like it or not, close can fail (and not only with EBADF)
329 if ((close (0) == 0) && (close (1) == 0) && (close (2) == 0)
330 && (dup (fds[1]) == 0) && (dup (fds[1]) == 1)
331 && (open ("/dev/null", O_RDONLY) == 2)
332 && ((psz_cwd == NULL) || (chdir (psz_cwd) == 0)))
333 execve (ppsz_argv[0], ppsz_argv, ppsz_env);
347 shutdown (fds[0], SHUT_WR);
349 while (!p_object->b_die)
351 struct pollfd ufd[1];
352 memset (ufd, 0, sizeof (ufd));
354 ufd[0].events = POLLIN;
357 ufd[0].events |= POLLOUT;
359 if (poll (ufd, 1, 10) <= 0)
362 if (ufd[0].revents & ~POLLOUT)
364 char *ptr = realloc (*pp_data, *pi_data + BUFSIZE + 1);
366 break; /* safely abort */
370 ssize_t val = read (fds[0], ptr + *pi_data, BUFSIZE);
375 shutdown (fds[0], SHUT_RD);
383 if (ufd[0].revents & POLLOUT)
385 ssize_t val = write (fds[0], p_in, i_in);
391 shutdown (fds[0], SHUT_WR);
403 while (waitpid (pid, &i_status, 0) == -1);
405 if (WIFEXITED (i_status))
407 i_status = WEXITSTATUS (i_status);
409 msg_Warn (p_object, "child %s (PID %d) exited with error code %d",
410 ppsz_argv[0], (int)pid, i_status);
413 if (WIFSIGNALED (i_status)) // <-- this should be redumdant a check
415 i_status = WTERMSIG (i_status);
416 msg_Warn (p_object, "child %s (PID %d) exited on signal %d (%s)",
417 ppsz_argv[0], (int)pid, i_status, strsignal (i_status));
420 #elif defined( WIN32 ) && !defined( UNDER_CE )
421 SECURITY_ATTRIBUTES saAttr;
422 PROCESS_INFORMATION piProcInfo;
423 STARTUPINFO siStartInfo;
424 BOOL bFuncRetn = FALSE;
425 HANDLE hChildStdinRd, hChildStdinWr, hChildStdoutRd, hChildStdoutWr;
427 char *psz_cmd = NULL, *p_env = NULL, *p = NULL;
431 /* Set the bInheritHandle flag so pipe handles are inherited. */
432 saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
433 saAttr.bInheritHandle = TRUE;
434 saAttr.lpSecurityDescriptor = NULL;
436 /* Create a pipe for the child process's STDOUT. */
437 if ( !CreatePipe( &hChildStdoutRd, &hChildStdoutWr, &saAttr, 0 ) )
439 msg_Err( p_object, "stdout pipe creation failed" );
443 /* Ensure the read handle to the pipe for STDOUT is not inherited. */
444 SetHandleInformation( hChildStdoutRd, HANDLE_FLAG_INHERIT, 0 );
446 /* Create a pipe for the child process's STDIN. */
447 if ( !CreatePipe( &hChildStdinRd, &hChildStdinWr, &saAttr, 0 ) )
449 msg_Err( p_object, "stdin pipe creation failed" );
453 /* Ensure the write handle to the pipe for STDIN is not inherited. */
454 SetHandleInformation( hChildStdinWr, HANDLE_FLAG_INHERIT, 0 );
456 /* Set up members of the PROCESS_INFORMATION structure. */
457 ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION) );
459 /* Set up members of the STARTUPINFO structure. */
460 ZeroMemory( &siStartInfo, sizeof(STARTUPINFO) );
461 siStartInfo.cb = sizeof(STARTUPINFO);
462 siStartInfo.hStdError = hChildStdoutWr;
463 siStartInfo.hStdOutput = hChildStdoutWr;
464 siStartInfo.hStdInput = hChildStdinRd;
465 siStartInfo.wShowWindow = SW_HIDE;
466 siStartInfo.dwFlags |= STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
468 /* Set up the command line. */
469 psz_cmd = malloc(32768);
474 ppsz_parser = &ppsz_argv[0];
475 while ( ppsz_parser[0] != NULL && i_size > 0 )
477 /* Protect the last argument with quotes ; the other arguments
478 * are supposed to be already protected because they have been
479 * passed as a command-line option. */
480 if ( ppsz_parser[1] == NULL )
482 strncat( psz_cmd, "\"", i_size );
485 strncat( psz_cmd, *ppsz_parser, i_size );
486 i_size -= strlen( *ppsz_parser );
487 if ( ppsz_parser[1] == NULL )
489 strncat( psz_cmd, "\"", i_size );
492 strncat( psz_cmd, " ", i_size );
497 /* Set up the environment. */
498 p = p_env = malloc(32768);
506 ppsz_parser = &ppsz_env[0];
507 while ( *ppsz_parser != NULL && i_size > 0 )
509 memcpy( p, *ppsz_parser,
510 __MIN((int)(strlen(*ppsz_parser) + 1), i_size) );
511 p += strlen(*ppsz_parser) + 1;
512 i_size -= strlen(*ppsz_parser) + 1;
517 /* Create the child process. */
518 bFuncRetn = CreateProcess( NULL,
519 psz_cmd, // command line
520 NULL, // process security attributes
521 NULL, // primary thread security attributes
522 TRUE, // handles are inherited
526 &siStartInfo, // STARTUPINFO pointer
527 &piProcInfo ); // receives PROCESS_INFORMATION
532 if ( bFuncRetn == 0 )
534 msg_Err( p_object, "child creation failed" );
538 /* Read from a file and write its contents to a pipe. */
539 while ( i_in > 0 && !p_object->b_die )
542 if ( !WriteFile( hChildStdinWr, p_in, i_in, &i_written, NULL ) )
548 /* Close the pipe handle so the child process stops reading. */
549 CloseHandle(hChildStdinWr);
551 /* Close the write end of the pipe before reading from the
552 * read end of the pipe. */
553 CloseHandle(hChildStdoutWr);
555 /* Read output from the child process. */
560 *pp_data = malloc( 1025 ); /* +1 for \0 */
562 while ( !p_object->b_die )
565 if ( !ReadFile( hChildStdoutRd, &(*pp_data)[*pi_data], 1024, &i_read,
570 *pp_data = realloc( *pp_data, *pi_data + 1025 );
573 while ( !p_object->b_die
574 && !GetExitCodeProcess( piProcInfo.hProcess, &i_status )
575 && i_status != STILL_ACTIVE )
578 CloseHandle(piProcInfo.hProcess);
579 CloseHandle(piProcInfo.hThread);
583 "child %s returned with error code %ld",
584 ppsz_argv[0], i_status );
587 msg_Err( p_object, "vlc_execve called but no implementation is available" );
592 if (*pp_data == NULL)
595 (*pp_data)[*pi_data] = '\0';