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>
9 * Gildas Bazin <gbazin@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
25 #include <string.h> /* strdup() */
36 #if defined(HAVE_ICONV)
40 /*****************************************************************************
41 * getenv: just in case, but it should never be called
42 *****************************************************************************/
43 #if !defined( HAVE_GETENV )
44 char *vlc_getenv( const char *name )
50 /*****************************************************************************
51 * strdup: returns a malloc'd copy of a string
52 *****************************************************************************/
53 #if !defined( HAVE_STRDUP )
54 char *vlc_strdup( const char *string )
56 return strndup( string, strlen( string ) );
60 /*****************************************************************************
61 * strndup: returns a malloc'd copy of at most n bytes of string
62 * Does anyone know whether or not it will be present in Jaguar?
63 *****************************************************************************/
64 #if !defined( HAVE_STRNDUP )
65 char *vlc_strndup( const char *string, size_t n )
68 size_t len = strlen( string );
70 len = __MIN( len, n );
71 psz = (char*)malloc( len + 1 );
75 memcpy( (void*)psz, (const void*)string, len );
83 /*****************************************************************************
84 * strcasecmp: compare two strings ignoring case
85 *****************************************************************************/
86 #if !defined( HAVE_STRCASECMP ) && !defined( HAVE_STRICMP )
87 int vlc_strcasecmp( const char *s1, const char *s2 )
91 while( !i_delta && *s1 && *s2 )
95 if( *s1 >= 'A' && *s1 <= 'Z' )
100 if( *s2 >= 'A' && *s2 <= 'Z' )
102 i_delta += 'A' - 'a';
112 /*****************************************************************************
113 * strncasecmp: compare n chars from two strings ignoring case
114 *****************************************************************************/
115 #if !defined( HAVE_STRNCASECMP ) && !defined( HAVE_STRNICMP )
116 int vlc_strncasecmp( const char *s1, const char *s2, size_t n )
120 while( n-- && !i_delta && *s1 )
124 if( *s1 >= 'A' && *s1 <= 'Z' )
126 i_delta -= 'A' - 'a';
129 if( *s2 >= 'A' && *s2 <= 'Z' )
131 i_delta += 'A' - 'a';
141 /******************************************************************************
142 * strcasestr: find a substring (little) in another substring (big)
143 * Case sensitive. Return NULL if not found, return big if little == null
144 *****************************************************************************/
145 #if !defined( HAVE_STRCASESTR ) && !defined( HAVE_STRISTR )
146 char * vlc_strcasestr( const char *psz_big, const char *psz_little )
148 char *p_pos = (char *)psz_big;
150 if( !psz_big || !psz_little || !*psz_little ) return p_pos;
154 if( toupper( *p_pos ) == toupper( *psz_little ) )
156 char * psz_cur1 = p_pos + 1;
157 char * psz_cur2 = (char *)psz_little + 1;
158 while( *psz_cur1 && *psz_cur2 &&
159 toupper( *psz_cur1 ) == toupper( *psz_cur2 ) )
164 if( !*psz_cur2 ) return p_pos;
172 /*****************************************************************************
174 *****************************************************************************/
175 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
176 int vlc_vasprintf(char **strp, const char *fmt, va_list ap)
178 /* Guess we need no more than 100 bytes. */
180 char *p = malloc( i_size );
191 /* Try to print in the allocated space. */
192 n = vsnprintf( p, i_size, fmt, ap );
194 /* If that worked, return the string. */
195 if (n > -1 && n < i_size)
200 /* Else try again with more space. */
201 if (n > -1) /* glibc 2.1 */
203 i_size = n+1; /* precisely what is needed */
207 i_size *= 2; /* twice the old size */
209 if( (p = realloc( p, i_size ) ) == NULL)
218 /*****************************************************************************
220 *****************************************************************************/
221 #if !defined(HAVE_ASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
222 int vlc_asprintf( char **strp, const char *fmt, ... )
227 va_start( args, fmt );
228 i_ret = vasprintf( strp, fmt, args );
235 /*****************************************************************************
236 * atof: convert a string to a double.
237 *****************************************************************************/
238 #if !defined( HAVE_ATOF )
239 double vlc_atof( const char *nptr )
243 int i_len = strlen( nptr ) + 1;
245 psz_tmp = malloc( i_len * sizeof(wchar_t) );
246 MultiByteToWideChar( CP_ACP, 0, nptr, -1, psz_tmp, i_len );
247 f_result = wcstod( psz_tmp, NULL );
254 /*****************************************************************************
255 * strtoll: convert a string to a 64 bits int.
256 *****************************************************************************/
257 #if !defined( HAVE_STRTOLL )
258 int64_t vlc_strtoll( const char *nptr, char **endptr, int base )
261 int sign = 1, newbase = base ? base : 10;
263 while( isspace(*nptr) ) nptr++;
271 /* Try to detect base */
284 if( base && newbase != base )
286 if( endptr ) *endptr = (char *)nptr;
293 while( *nptr >= '0' && *nptr <= '9' )
296 i_value += ( *nptr++ - '0' );
298 if( endptr ) *endptr = (char *)nptr;
302 while( (*nptr >= '0' && *nptr <= '9') ||
303 (*nptr >= 'a' && *nptr <= 'f') ||
304 (*nptr >= 'A' && *nptr <= 'F') )
307 if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
308 else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
309 else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
314 if( endptr ) *endptr = (char *)nptr;
318 i_value = strtol( nptr, endptr, newbase );
322 return i_value * sign;
326 /*****************************************************************************
327 * atoll: convert a string to a 64 bits int.
328 *****************************************************************************/
329 #if !defined( HAVE_ATOLL )
330 int64_t vlc_atoll( const char *nptr )
332 return strtoll( nptr, (char **)NULL, 10 );
336 /*****************************************************************************
337 * lseek: reposition read/write file offset.
338 *****************************************************************************
339 * FIXME: this cast sucks!
340 *****************************************************************************/
341 #if !defined( HAVE_LSEEK )
342 off_t vlc_lseek( int fildes, off_t offset, int whence )
344 return SetFilePointer( (HANDLE)fildes, (long)offset, NULL, whence );
348 /*****************************************************************************
349 * dgettext: gettext for plugins.
350 *****************************************************************************/
351 char *vlc_dgettext( const char *package, const char *msgid )
353 #if defined( ENABLE_NLS ) \
354 && ( defined(HAVE_GETTEXT) || defined(HAVE_INCLUDED_GETTEXT) )
355 return dgettext( package, msgid );
357 return (char *)msgid;
361 /*****************************************************************************
362 * count_utf8_string: returns the number of characters in the string.
363 *****************************************************************************/
364 static int count_utf8_string( const char *psz_string )
366 int i = 0, i_count = 0;
367 while( psz_string[ i ] != 0 )
369 if( ((unsigned char *)psz_string)[ i ] < 0x80UL ) i_count++;
375 /*****************************************************************************
376 * wraptext: inserts \n at convenient places to wrap the text.
377 * Returns the modified string in a new buffer.
378 *****************************************************************************/
379 char *vlc_wraptext( const char *psz_text, int i_line, vlc_bool_t b_utf8 )
382 char *psz_line, *psz_new_text;
384 psz_line = psz_new_text = strdup( psz_text );
387 i_len = count_utf8_string( psz_text );
389 i_len = strlen( psz_text );
391 while( i_len > i_line )
393 /* Look if there is a newline somewhere. */
394 char *psz_parser = psz_line;
396 while( i_count <= i_line && *psz_parser != '\n' )
400 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
405 if( *psz_parser == '\n' )
407 i_len -= (i_count + 1);
408 psz_line = psz_parser + 1;
412 /* Find the furthest space. */
413 while( psz_parser > psz_line && *psz_parser != ' ' )
417 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser--;
422 if( *psz_parser == ' ' )
425 i_len -= (i_count + 1);
426 psz_line = psz_parser + 1;
430 /* Wrapping has failed. Find the first space or newline */
431 while( i_count < i_len && *psz_parser != ' ' && *psz_parser != '\n' )
435 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
440 if( i_count < i_len ) *psz_parser = '\n';
441 i_len -= (i_count + 1);
442 psz_line = psz_parser + 1;
448 /*****************************************************************************
450 *****************************************************************************/
451 vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
453 #if defined(HAVE_ICONV)
454 return iconv_open( tocode, fromcode );
460 size_t vlc_iconv( vlc_iconv_t cd, char **inbuf, size_t *inbytesleft,
461 char **outbuf, size_t *outbytesleft )
463 #if defined(HAVE_ICONV)
464 return iconv( cd, inbuf, inbytesleft, outbuf, outbytesleft );
466 int i_bytes = __MIN(*inbytesleft, *outbytesleft);
467 if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
468 memcpy( *outbuf, *inbuf, i_bytes );
471 inbytesleft -= i_bytes;
472 outbytesleft -= i_bytes;
477 int vlc_iconv_close( vlc_iconv_t cd )
479 #if defined(HAVE_ICONV)
480 return iconv_close( cd );
486 /*****************************************************************************
488 * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
489 *****************************************************************************/
490 vlc_bool_t vlc_reduce( int *pi_dst_nom, int *pi_dst_den,
491 int64_t i_nom, int64_t i_den, int64_t i_max )
493 vlc_bool_t b_exact = 1, b_sign = 0;
515 i_gcd = GCD( i_nom, i_den );
519 if( i_max == 0 ) i_max = I64C(0xFFFFFFFF);
521 if( i_nom > i_max || i_den > i_max )
523 int i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
528 int64_t i_x = i_nom / i_den;
529 int64_t i_a2n = i_x * i_a1_num + i_a0_num;
530 int64_t i_a2d = i_x * i_a1_den + i_a0_den;
532 if( i_a2n > i_max || i_a2d > i_max ) break;
536 i_a0_num = i_a1_num; i_a0_den = i_a1_den;
537 i_a1_num = i_a2n; i_a1_den = i_a2d;
538 if( i_nom == 0 ) break;
539 i_x = i_nom; i_nom = i_den; i_den = i_x;
545 if( b_sign ) i_nom = - i_nom;