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 *****************************************************************************/
42 #if defined(HAVE_ICONV)
55 # include <sys/time.h>
58 # include <sys/wait.h>
60 # include <sys/socket.h>
61 # include <sys/poll.h>
64 #if defined(WIN32) || defined(UNDER_CE)
69 # define WIN32_LEAN_AND_MEAN
73 /******************************************************************************
74 * strcasestr: find a substring (little) in another substring (big)
75 * Case sensitive. Return NULL if not found, return big if little == null
76 *****************************************************************************/
77 #if !defined( HAVE_STRCASESTR ) && !defined( HAVE_STRISTR )
78 char * vlc_strcasestr( const char *psz_big, const char *psz_little )
80 char *p_pos = (char *)psz_big;
82 if( !psz_big || !psz_little || !*psz_little ) return p_pos;
86 if( toupper( *p_pos ) == toupper( *psz_little ) )
88 char * psz_cur1 = p_pos + 1;
89 char * psz_cur2 = (char *)psz_little + 1;
90 while( *psz_cur1 && *psz_cur2 &&
91 toupper( *psz_cur1 ) == toupper( *psz_cur2 ) )
96 if( !*psz_cur2 ) return p_pos;
104 /*****************************************************************************
106 *****************************************************************************/
107 #if !defined(HAVE_VASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
108 int vlc_vasprintf(char **strp, const char *fmt, va_list ap)
110 /* Guess we need no more than 100 bytes. */
112 char *p = malloc( i_size );
123 /* Try to print in the allocated space. */
124 n = vsnprintf( p, i_size, fmt, ap );
126 /* If that worked, return the string. */
127 if (n > -1 && n < i_size)
132 /* Else try again with more space. */
133 if (n > -1) /* glibc 2.1 */
135 i_size = n+1; /* precisely what is needed */
139 i_size *= 2; /* twice the old size */
141 if( (p = realloc( p, i_size ) ) == NULL)
150 /*****************************************************************************
152 *****************************************************************************/
153 #if !defined(HAVE_ASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
154 int vlc_asprintf( char **strp, const char *fmt, ... )
159 va_start( args, fmt );
160 i_ret = vasprintf( strp, fmt, args );
167 /*****************************************************************************
168 * strtoll: convert a string to a 64 bits int.
169 *****************************************************************************/
170 long long vlc_strtoll( const char *nptr, char **endptr, int base )
172 #if defined( HAVE_STRTOLL )
173 return strtoll( nptr, endptr, base );
175 long long i_value = 0;
176 int sign = 1, newbase = base ? base : 10;
178 while( isspace(*nptr) ) nptr++;
186 /* Try to detect base */
199 if( base && newbase != base )
201 if( endptr ) *endptr = (char *)nptr;
208 while( *nptr >= '0' && *nptr <= '9' )
211 i_value += ( *nptr++ - '0' );
213 if( endptr ) *endptr = (char *)nptr;
217 while( (*nptr >= '0' && *nptr <= '9') ||
218 (*nptr >= 'a' && *nptr <= 'f') ||
219 (*nptr >= 'A' && *nptr <= 'F') )
222 if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
223 else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
224 else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
229 if( endptr ) *endptr = (char *)nptr;
233 i_value = strtol( nptr, endptr, newbase );
237 return i_value * sign;
242 * Copy a string to a sized buffer. The result is always nul-terminated
243 * (contrary to strncpy()).
245 * @param dest destination buffer
246 * @param src string to be copied
247 * @param len maximum number of characters to be copied plus one for the
250 * @return strlen(src)
253 extern size_t vlc_strlcpy (char *tgt, const char *src, size_t bufsize)
257 for (length = 1; (length < bufsize) && *src; length++)
270 /*****************************************************************************
271 * vlc_*dir_wrapper: wrapper under Windows to return the list of drive letters
272 * when called with an empty argument or just '\'
273 *****************************************************************************/
274 #if defined(WIN32) && !defined(UNDER_CE)
277 typedef struct vlc_DIR
281 struct _wdirent dd_dir;
285 void *vlc_wopendir( const wchar_t *wpath )
287 vlc_DIR *p_dir = NULL;
288 _WDIR *p_real_dir = NULL;
290 if ( wpath == NULL || wpath[0] == '\0'
291 || (wcscmp (wpath, L"\\") == 0) )
293 /* Special mode to list drive letters */
294 p_dir = malloc( sizeof(vlc_DIR) );
297 p_dir->p_real_dir = NULL;
298 p_dir->i_drives = GetLogicalDrives();
299 return (void *)p_dir;
302 p_real_dir = _wopendir( wpath );
303 if ( p_real_dir == NULL )
306 p_dir = malloc( sizeof(vlc_DIR) );
309 _wclosedir( p_real_dir );
312 p_dir->p_real_dir = p_real_dir;
314 assert (wpath[0]); // wpath[1] is defined
315 p_dir->b_insert_back = !wcscmp (wpath + 1, L":\\");
316 return (void *)p_dir;
319 struct _wdirent *vlc_wreaddir( void *_p_dir )
321 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
325 if ( p_dir->p_real_dir != NULL )
327 if ( p_dir->b_insert_back )
329 /* Adds "..", gruik! */
330 p_dir->dd_dir.d_ino = 0;
331 p_dir->dd_dir.d_reclen = 0;
332 p_dir->dd_dir.d_namlen = 2;
333 wcscpy( p_dir->dd_dir.d_name, L".." );
334 p_dir->b_insert_back = false;
335 return &p_dir->dd_dir;
338 return _wreaddir( p_dir->p_real_dir );
341 /* Drive letters mode */
342 i_drives = p_dir->i_drives;
344 return NULL; /* end */
346 for ( i = 0; i < sizeof(DWORD)*8; i++, i_drives >>= 1 )
347 if ( i_drives & 1 ) break;
350 return NULL; /* this should not happen */
352 swprintf( p_dir->dd_dir.d_name, L"%c:\\", 'A' + i );
353 p_dir->dd_dir.d_namlen = wcslen(p_dir->dd_dir.d_name);
354 p_dir->i_drives &= ~(1UL << i);
355 return &p_dir->dd_dir;
358 int vlc_wclosedir( void *_p_dir )
360 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
363 if ( p_dir->p_real_dir != NULL )
364 i_ret = _wclosedir( p_dir->p_real_dir );
370 void vlc_rewinddir( void *_p_dir )
372 vlc_DIR *p_dir = (vlc_DIR *)_p_dir;
374 if ( p_dir->p_real_dir != NULL )
375 _wrewinddir( p_dir->p_real_dir );
381 * gettext callbacks for plugins.
382 * LibVLC links libintl statically on Windows.
384 char *vlc_dgettext( const char *package, const char *msgid )
386 return dgettext( package, msgid );
391 * In-tree plugins share their gettext domain with LibVLC.
393 char *vlc_gettext( const char *msgid )
395 return dgettext( PACKAGE_NAME, msgid );
398 /*****************************************************************************
399 * count_utf8_string: returns the number of characters in the string.
400 *****************************************************************************/
401 static int count_utf8_string( const char *psz_string )
403 int i = 0, i_count = 0;
404 while( psz_string[ i ] != 0 )
406 if( ((unsigned char *)psz_string)[ i ] < 0x80UL ) i_count++;
412 /*****************************************************************************
413 * wraptext: inserts \n at convenient places to wrap the text.
414 * Returns the modified string in a new buffer.
415 *****************************************************************************/
416 char *vlc_wraptext( const char *psz_text, int i_line )
419 char *psz_line, *psz_new_text;
421 psz_line = psz_new_text = strdup( psz_text );
423 i_len = count_utf8_string( psz_text );
425 while( i_len > i_line )
427 /* Look if there is a newline somewhere. */
428 char *psz_parser = psz_line;
430 while( i_count <= i_line && *psz_parser != '\n' )
432 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
436 if( *psz_parser == '\n' )
438 i_len -= (i_count + 1);
439 psz_line = psz_parser + 1;
443 /* Find the furthest space. */
444 while( psz_parser > psz_line && *psz_parser != ' ' )
446 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser--;
450 if( *psz_parser == ' ' )
453 i_len -= (i_count + 1);
454 psz_line = psz_parser + 1;
458 /* Wrapping has failed. Find the first space or newline */
459 while( i_count < i_len && *psz_parser != ' ' && *psz_parser != '\n' )
461 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
465 if( i_count < i_len ) *psz_parser = '\n';
466 i_len -= (i_count + 1);
467 psz_line = psz_parser + 1;
473 /*****************************************************************************
475 *****************************************************************************/
476 vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
478 #if defined(HAVE_ICONV)
479 return iconv_open( tocode, fromcode );
485 size_t vlc_iconv( vlc_iconv_t cd, const char **inbuf, size_t *inbytesleft,
486 char **outbuf, size_t *outbytesleft )
488 #if defined(HAVE_ICONV)
489 return iconv( cd, (ICONV_CONST char **)inbuf, inbytesleft,
490 outbuf, outbytesleft );
494 if (inbytesleft == NULL || outbytesleft == NULL)
499 i_bytes = __MIN(*inbytesleft, *outbytesleft);
500 if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
501 memcpy( *outbuf, *inbuf, i_bytes );
504 inbytesleft -= i_bytes;
505 outbytesleft -= i_bytes;
510 int vlc_iconv_close( vlc_iconv_t cd )
512 #if defined(HAVE_ICONV)
513 return iconv_close( cd );
519 /*****************************************************************************
521 * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
522 *****************************************************************************/
523 bool vlc_ureduce( unsigned *pi_dst_nom, unsigned *pi_dst_den,
524 uint64_t i_nom, uint64_t i_den, uint64_t i_max )
536 i_gcd = GCD( i_nom, i_den );
540 if( i_max == 0 ) i_max = INT64_C(0xFFFFFFFF);
542 if( i_nom > i_max || i_den > i_max )
544 uint64_t i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
549 uint64_t i_x = i_nom / i_den;
550 uint64_t i_a2n = i_x * i_a1_num + i_a0_num;
551 uint64_t i_a2d = i_x * i_a1_den + i_a0_den;
553 if( i_a2n > i_max || i_a2d > i_max ) break;
557 i_a0_num = i_a1_num; i_a0_den = i_a1_den;
558 i_a1_num = i_a2n; i_a1_den = i_a2d;
559 if( i_nom == 0 ) break;
560 i_x = i_nom; i_nom = i_den; i_den = i_x;
572 /*************************************************************************
573 * vlc_execve: Execute an external program with a given environment,
574 * wait until it finishes and return its standard output
575 *************************************************************************/
576 int __vlc_execve( vlc_object_t *p_object, int i_argc, char *const *ppsz_argv,
577 char *const *ppsz_env, const char *psz_cwd,
578 const char *p_in, size_t i_in,
579 char **pp_data, size_t *pi_data )
581 (void)i_argc; // <-- hmph
583 # define BUFSIZE 1024
584 int fds[2], i_status;
586 if (socketpair (AF_LOCAL, SOCK_STREAM, 0, fds))
590 if ((fds[0] > 2) && (fds[1] > 2))
596 msg_Err (p_object, "unable to fork (%m)");
605 pthread_sigmask (SIG_SETMASK, &set, NULL);
608 * Like it or not, close can fail (and not only with EBADF)
610 if ((close (0) == 0) && (close (1) == 0) && (close (2) == 0)
611 && (dup (fds[1]) == 0) && (dup (fds[1]) == 1)
612 && (open ("/dev/null", O_RDONLY) == 2)
613 && ((psz_cwd == NULL) || (chdir (psz_cwd) == 0)))
614 execve (ppsz_argv[0], ppsz_argv, ppsz_env);
628 shutdown (fds[0], SHUT_WR);
630 while (!p_object->b_die)
632 struct pollfd ufd[1];
633 memset (ufd, 0, sizeof (ufd));
635 ufd[0].events = POLLIN;
638 ufd[0].events |= POLLOUT;
640 if (poll (ufd, 1, 10) <= 0)
643 if (ufd[0].revents & ~POLLOUT)
645 char *ptr = realloc (*pp_data, *pi_data + BUFSIZE + 1);
647 break; /* safely abort */
651 ssize_t val = read (fds[0], ptr + *pi_data, BUFSIZE);
656 shutdown (fds[0], SHUT_RD);
664 if (ufd[0].revents & POLLOUT)
666 ssize_t val = write (fds[0], p_in, i_in);
672 shutdown (fds[0], SHUT_WR);
684 while (waitpid (pid, &i_status, 0) == -1);
686 if (WIFEXITED (i_status))
688 i_status = WEXITSTATUS (i_status);
690 msg_Warn (p_object, "child %s (PID %d) exited with error code %d",
691 ppsz_argv[0], (int)pid, i_status);
694 if (WIFSIGNALED (i_status)) // <-- this should be redumdant a check
696 i_status = WTERMSIG (i_status);
697 msg_Warn (p_object, "child %s (PID %d) exited on signal %d (%s)",
698 ppsz_argv[0], (int)pid, i_status, strsignal (i_status));
701 #elif defined( WIN32 ) && !defined( UNDER_CE )
702 SECURITY_ATTRIBUTES saAttr;
703 PROCESS_INFORMATION piProcInfo;
704 STARTUPINFO siStartInfo;
705 BOOL bFuncRetn = FALSE;
706 HANDLE hChildStdinRd, hChildStdinWr, hChildStdoutRd, hChildStdoutWr;
708 char *psz_cmd = NULL, *p_env = NULL, *p = NULL;
712 /* Set the bInheritHandle flag so pipe handles are inherited. */
713 saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
714 saAttr.bInheritHandle = TRUE;
715 saAttr.lpSecurityDescriptor = NULL;
717 /* Create a pipe for the child process's STDOUT. */
718 if ( !CreatePipe( &hChildStdoutRd, &hChildStdoutWr, &saAttr, 0 ) )
720 msg_Err( p_object, "stdout pipe creation failed" );
724 /* Ensure the read handle to the pipe for STDOUT is not inherited. */
725 SetHandleInformation( hChildStdoutRd, HANDLE_FLAG_INHERIT, 0 );
727 /* Create a pipe for the child process's STDIN. */
728 if ( !CreatePipe( &hChildStdinRd, &hChildStdinWr, &saAttr, 0 ) )
730 msg_Err( p_object, "stdin pipe creation failed" );
734 /* Ensure the write handle to the pipe for STDIN is not inherited. */
735 SetHandleInformation( hChildStdinWr, HANDLE_FLAG_INHERIT, 0 );
737 /* Set up members of the PROCESS_INFORMATION structure. */
738 ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION) );
740 /* Set up members of the STARTUPINFO structure. */
741 ZeroMemory( &siStartInfo, sizeof(STARTUPINFO) );
742 siStartInfo.cb = sizeof(STARTUPINFO);
743 siStartInfo.hStdError = hChildStdoutWr;
744 siStartInfo.hStdOutput = hChildStdoutWr;
745 siStartInfo.hStdInput = hChildStdinRd;
746 siStartInfo.wShowWindow = SW_HIDE;
747 siStartInfo.dwFlags |= STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
749 /* Set up the command line. */
750 psz_cmd = malloc(32768);
755 ppsz_parser = &ppsz_argv[0];
756 while ( ppsz_parser[0] != NULL && i_size > 0 )
758 /* Protect the last argument with quotes ; the other arguments
759 * are supposed to be already protected because they have been
760 * passed as a command-line option. */
761 if ( ppsz_parser[1] == NULL )
763 strncat( psz_cmd, "\"", i_size );
766 strncat( psz_cmd, *ppsz_parser, i_size );
767 i_size -= strlen( *ppsz_parser );
768 if ( ppsz_parser[1] == NULL )
770 strncat( psz_cmd, "\"", i_size );
773 strncat( psz_cmd, " ", i_size );
778 /* Set up the environment. */
779 p = p_env = malloc(32768);
787 ppsz_parser = &ppsz_env[0];
788 while ( *ppsz_parser != NULL && i_size > 0 )
790 memcpy( p, *ppsz_parser,
791 __MIN((int)(strlen(*ppsz_parser) + 1), i_size) );
792 p += strlen(*ppsz_parser) + 1;
793 i_size -= strlen(*ppsz_parser) + 1;
798 /* Create the child process. */
799 bFuncRetn = CreateProcess( NULL,
800 psz_cmd, // command line
801 NULL, // process security attributes
802 NULL, // primary thread security attributes
803 TRUE, // handles are inherited
807 &siStartInfo, // STARTUPINFO pointer
808 &piProcInfo ); // receives PROCESS_INFORMATION
813 if ( bFuncRetn == 0 )
815 msg_Err( p_object, "child creation failed" );
819 /* Read from a file and write its contents to a pipe. */
820 while ( i_in > 0 && !p_object->b_die )
823 if ( !WriteFile( hChildStdinWr, p_in, i_in, &i_written, NULL ) )
829 /* Close the pipe handle so the child process stops reading. */
830 CloseHandle(hChildStdinWr);
832 /* Close the write end of the pipe before reading from the
833 * read end of the pipe. */
834 CloseHandle(hChildStdoutWr);
836 /* Read output from the child process. */
841 *pp_data = malloc( 1025 ); /* +1 for \0 */
843 while ( !p_object->b_die )
846 if ( !ReadFile( hChildStdoutRd, &(*pp_data)[*pi_data], 1024, &i_read,
851 *pp_data = realloc( *pp_data, *pi_data + 1025 );
854 while ( !p_object->b_die
855 && !GetExitCodeProcess( piProcInfo.hProcess, &i_status )
856 && i_status != STILL_ACTIVE )
859 CloseHandle(piProcInfo.hProcess);
860 CloseHandle(piProcInfo.hThread);
864 "child %s returned with error code %ld",
865 ppsz_argv[0], i_status );
868 msg_Err( p_object, "vlc_execve called but no implementation is available" );
873 if (*pp_data == NULL)
876 (*pp_data)[*pi_data] = '\0';