1 /*****************************************************************************
2 * libc.c: Extra libc function for some systems.
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
7 * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
8 * Samuel Hocevar <sam@zoy.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
24 #include <string.h> /* strdup() */
35 #if defined(HAVE_ICONV)
39 /*****************************************************************************
40 * getenv: just in case, but it should never be called
41 *****************************************************************************/
42 #if !defined( HAVE_GETENV )
43 char *vlc_getenv( const char *name )
49 /*****************************************************************************
50 * strdup: returns a malloc'd copy of a string
51 *****************************************************************************/
52 #if !defined( HAVE_STRDUP )
53 char *vlc_strdup( const char *string )
55 return strndup( string, strlen( string ) );
59 /*****************************************************************************
60 * strndup: returns a malloc'd copy of at most n bytes of string
61 * Does anyone know whether or not it will be present in Jaguar?
62 *****************************************************************************/
63 #if !defined( HAVE_STRNDUP )
64 char *vlc_strndup( const char *string, size_t n )
67 size_t len = strlen( string );
69 len = __MIN( len, n );
70 psz = (char*)malloc( len + 1 );
74 memcpy( (void*)psz, (const void*)string, len );
82 /*****************************************************************************
83 * strcasecmp: compare two strings ignoring case
84 *****************************************************************************/
85 #if !defined( HAVE_STRCASECMP ) && !defined( HAVE_STRICMP )
86 int vlc_strcasecmp( const char *s1, const char *s2 )
90 while( !i_delta && *s1 && *s2 )
94 if( *s1 >= 'A' && *s1 <= 'Z' )
99 if( *s2 >= 'A' && *s2 <= 'Z' )
101 i_delta += 'A' - 'a';
111 /*****************************************************************************
112 * strncasecmp: compare n chars from two strings ignoring case
113 *****************************************************************************/
114 #if !defined( HAVE_STRNCASECMP ) && !defined( HAVE_STRNICMP )
115 int vlc_strncasecmp( const char *s1, const char *s2, size_t n )
119 while( n-- && !i_delta && *s1 )
123 if( *s1 >= 'A' && *s1 <= 'Z' )
125 i_delta -= 'A' - 'a';
128 if( *s2 >= 'A' && *s2 <= 'Z' )
130 i_delta += 'A' - 'a';
140 /******************************************************************************
141 * strcasestr: find a substring (little) in another substring (big)
142 * Case sensitive. Return NULL if not found, return big if little == null
143 *****************************************************************************/
144 #if !defined( HAVE_STRCASESTR ) && !defined( HAVE_STRISTR )
145 char * vlc_strcasestr( const char *psz_big, const char *psz_little )
147 char *p_pos = psz_big;
149 if( !psz_big || !psz_little || !*psz_little ) return psz_big;
153 if( toupper( *p_pos ) == toupper( *psz_little ) )
155 char * psz_cur1 = p_pos + 1;
156 char * psz_cur2 = psz_little + 1;
157 while( *psz_cur1 && *psz_cur2 &&
158 toupper( *psz_cur1 ) == toupper( *psz_cur2 ) )
163 if( !*psz_cur2 ) return p_pos;
171 /*****************************************************************************
173 *****************************************************************************/
174 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
175 int vlc_vasprintf(char **strp, const char *fmt, va_list ap)
177 /* Guess we need no more than 100 bytes. */
179 char *p = malloc( i_size );
190 /* Try to print in the allocated space. */
191 n = vsnprintf( p, i_size, fmt, ap );
193 /* If that worked, return the string. */
194 if (n > -1 && n < i_size)
199 /* Else try again with more space. */
200 if (n > -1) /* glibc 2.1 */
202 i_size = n+1; /* precisely what is needed */
206 i_size *= 2; /* twice the old size */
208 if( (p = realloc( p, i_size ) ) == NULL)
217 /*****************************************************************************
219 *****************************************************************************/
220 #if !defined(HAVE_ASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
221 int vlc_asprintf( char **strp, const char *fmt, ... )
226 va_start( args, fmt );
227 i_ret = vasprintf( strp, fmt, args );
234 /*****************************************************************************
235 * atof: convert a string to a double.
236 *****************************************************************************/
237 #if !defined( HAVE_ATOF )
238 double vlc_atof( const char *nptr )
242 int i_len = strlen( nptr ) + 1;
244 psz_tmp = malloc( i_len * sizeof(wchar_t) );
245 MultiByteToWideChar( CP_ACP, 0, nptr, -1, psz_tmp, i_len );
246 f_result = wcstod( psz_tmp, NULL );
253 /*****************************************************************************
254 * strtoll: convert a string to a 64 bits int.
255 *****************************************************************************/
256 #if !defined( HAVE_STRTOLL )
257 int64_t vlc_strtoll( const char *nptr, char **endptr, int base )
260 int sign = 1, newbase = base ? base : 10;
262 while( isspace(*nptr) ) nptr++;
270 /* Try to detect base */
283 if( base && newbase != base )
285 if( endptr ) *endptr = (char *)nptr;
292 while( *nptr >= '0' && *nptr <= '9' )
295 i_value += ( *nptr++ - '0' );
297 if( endptr ) *endptr = (char *)nptr;
301 while( (*nptr >= '0' && *nptr <= '9') ||
302 (*nptr >= 'a' && *nptr <= 'f') ||
303 (*nptr >= 'A' && *nptr <= 'F') )
306 if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
307 else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
308 else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
313 if( endptr ) *endptr = (char *)nptr;
317 i_value = strtol( nptr, endptr, newbase );
321 return i_value * sign;
325 /*****************************************************************************
326 * atoll: convert a string to a 64 bits int.
327 *****************************************************************************/
328 #if !defined( HAVE_ATOLL )
329 int64_t vlc_atoll( const char *nptr )
331 return strtoll( nptr, (char **)NULL, 10 );
335 /*****************************************************************************
336 * lseek: reposition read/write file offset.
337 *****************************************************************************
338 * FIXME: this cast sucks!
339 *****************************************************************************/
340 #if !defined( HAVE_LSEEK )
341 off_t vlc_lseek( int fildes, off_t offset, int whence )
343 return SetFilePointer( (HANDLE)fildes, (long)offset, NULL, whence );
347 /*****************************************************************************
348 * dgettext: gettext for plugins.
349 *****************************************************************************/
350 char *vlc_dgettext( const char *package, const char *msgid )
352 #if defined( ENABLE_NLS ) \
353 && ( defined(HAVE_GETTEXT) || defined(HAVE_INCLUDED_GETTEXT) )
354 return dgettext( package, msgid );
356 return (char *)msgid;
360 /*****************************************************************************
361 * count_utf8_string: returns the number of characters in the string.
362 *****************************************************************************/
363 static int count_utf8_string( const char *psz_string )
365 int i = 0, i_count = 0;
366 while( psz_string[ i ] != 0 )
368 if( ((unsigned char *)psz_string)[ i ] < 0x80UL ) i_count++;
374 /*****************************************************************************
375 * wraptext: inserts \n at convenient places to wrap the text.
376 * Returns the modified string in a new buffer.
377 *****************************************************************************/
378 char *vlc_wraptext( const char *psz_text, int i_line, vlc_bool_t b_utf8 )
381 char *psz_line, *psz_new_text;
383 psz_line = psz_new_text = strdup( psz_text );
386 i_len = count_utf8_string( psz_text );
388 i_len = strlen( psz_text );
390 while( i_len > i_line )
392 /* Look if there is a newline somewhere. */
393 char *psz_parser = psz_line;
395 while( i_count <= i_line && *psz_parser != '\n' )
399 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
404 if( *psz_parser == '\n' )
406 i_len -= (i_count + 1);
407 psz_line = psz_parser + 1;
411 /* Find the furthest space. */
412 while( psz_parser > psz_line && *psz_parser != ' ' )
416 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser--;
421 if( *psz_parser == ' ' )
424 i_len -= (i_count + 1);
425 psz_line = psz_parser + 1;
429 /* Wrapping has failed. Find the first space or newline */
430 while( i_count < i_len && *psz_parser != ' ' && *psz_parser != '\n' )
434 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
439 if( i_count < i_len ) *psz_parser = '\n';
440 i_len -= (i_count + 1);
441 psz_line = psz_parser + 1;
447 /*****************************************************************************
449 *****************************************************************************/
450 vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
452 #if defined(HAVE_ICONV)
453 return iconv_open( tocode, fromcode );
459 size_t vlc_iconv( vlc_iconv_t cd, char **inbuf, size_t *inbytesleft,
460 char **outbuf, size_t *outbytesleft )
462 #if defined(HAVE_ICONV)
463 return iconv( cd, inbuf, inbytesleft, outbuf, outbytesleft );
465 int i_bytes = __MIN(inbytesleft, outbytesleft);
466 if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
467 memcpy( *outbuf, *inbuf, i_bytes );
470 inbytesleft -= i_bytes;
471 outbytesleft -= i_bytes;
476 int vlc_iconv_close( vlc_iconv_t cd )
478 #if defined(HAVE_ICONV)
479 return iconv_close( cd );
485 /*****************************************************************************
487 * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
488 *****************************************************************************/
489 vlc_bool_t vlc_reduce( int *pi_dst_nom, int *pi_dst_den,
490 int64_t i_nom, int64_t i_den, int64_t i_max )
492 vlc_bool_t b_exact = 1, b_sign = 0;
514 i_gcd = GCD( i_nom, i_den );
518 if( i_max == 0 ) i_max = I64C(0xFFFFFFFF);
520 if( i_nom > i_max || i_den > i_max )
522 int i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
527 int64_t i_x = i_nom / i_den;
528 int64_t i_a2n = i_x * i_a1_num + i_a0_num;
529 int64_t i_a2d = i_x * i_a1_den + i_a0_den;
531 if( i_a2n > i_max || i_a2d > i_max ) break;
535 i_a0_num = i_a1_num; i_a0_den = i_a1_den;
536 i_a1_num = i_a2n; i_a1_den = i_a2d;
537 if( i_nom == 0 ) break;
538 i_x = i_nom; i_nom = i_den; i_den = i_x;
544 if( b_sign ) i_nom = - i_nom;