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 )
90 if( !s1 || !s2 ) return -1;
92 while( !i_delta && *s1 && *s2 )
96 if( *s1 >= 'A' && *s1 <= 'Z' )
98 i_delta -= ('A' - 'a');
101 if( *s2 >= 'A' && *s2 <= 'Z' )
103 i_delta += ('A' - 'a');
109 if( !i_delta && (*s1 || *s2) ) i_delta = *s1 ? 1 : -1;
115 /*****************************************************************************
116 * strncasecmp: compare n chars from two strings ignoring case
117 *****************************************************************************/
118 #if !defined( HAVE_STRNCASECMP ) && !defined( HAVE_STRNICMP )
119 int vlc_strncasecmp( const char *s1, const char *s2, size_t n )
122 if( !s1 || !s2 ) return -1;
124 while( n-- && !i_delta && *s1 && *s2 )
128 if( *s1 >= 'A' && *s1 <= 'Z' )
130 i_delta -= 'A' - 'a';
133 if( *s2 >= 'A' && *s2 <= 'Z' )
135 i_delta += 'A' - 'a';
141 if( !n && !i_delta && (*s1 || *s2) ) i_delta = *s1 ? 1 : -1;
147 /******************************************************************************
148 * strcasestr: find a substring (little) in another substring (big)
149 * Case sensitive. Return NULL if not found, return big if little == null
150 *****************************************************************************/
151 #if !defined( HAVE_STRCASESTR ) && !defined( HAVE_STRISTR )
152 char * vlc_strcasestr( const char *psz_big, const char *psz_little )
154 char *p_pos = (char *)psz_big;
156 if( !psz_big || !psz_little || !*psz_little ) return p_pos;
160 if( toupper( *p_pos ) == toupper( *psz_little ) )
162 char * psz_cur1 = p_pos + 1;
163 char * psz_cur2 = (char *)psz_little + 1;
164 while( *psz_cur1 && *psz_cur2 &&
165 toupper( *psz_cur1 ) == toupper( *psz_cur2 ) )
170 if( !*psz_cur2 ) return p_pos;
178 /*****************************************************************************
180 *****************************************************************************/
181 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
182 int vlc_vasprintf(char **strp, const char *fmt, va_list ap)
184 /* Guess we need no more than 100 bytes. */
186 char *p = malloc( i_size );
197 /* Try to print in the allocated space. */
198 n = vsnprintf( p, i_size, fmt, ap );
200 /* If that worked, return the string. */
201 if (n > -1 && n < i_size)
206 /* Else try again with more space. */
207 if (n > -1) /* glibc 2.1 */
209 i_size = n+1; /* precisely what is needed */
213 i_size *= 2; /* twice the old size */
215 if( (p = realloc( p, i_size ) ) == NULL)
224 /*****************************************************************************
226 *****************************************************************************/
227 #if !defined(HAVE_ASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
228 int vlc_asprintf( char **strp, const char *fmt, ... )
233 va_start( args, fmt );
234 i_ret = vasprintf( strp, fmt, args );
241 /*****************************************************************************
242 * atof: convert a string to a double.
243 *****************************************************************************/
244 #if !defined( HAVE_ATOF )
245 double vlc_atof( const char *nptr )
249 int i_len = strlen( nptr ) + 1;
251 psz_tmp = malloc( i_len * sizeof(wchar_t) );
252 MultiByteToWideChar( CP_ACP, 0, nptr, -1, psz_tmp, i_len );
253 f_result = wcstod( psz_tmp, NULL );
260 /*****************************************************************************
261 * strtoll: convert a string to a 64 bits int.
262 *****************************************************************************/
263 #if !defined( HAVE_STRTOLL )
264 int64_t vlc_strtoll( const char *nptr, char **endptr, int base )
267 int sign = 1, newbase = base ? base : 10;
269 while( isspace(*nptr) ) nptr++;
277 /* Try to detect base */
290 if( base && newbase != base )
292 if( endptr ) *endptr = (char *)nptr;
299 while( *nptr >= '0' && *nptr <= '9' )
302 i_value += ( *nptr++ - '0' );
304 if( endptr ) *endptr = (char *)nptr;
308 while( (*nptr >= '0' && *nptr <= '9') ||
309 (*nptr >= 'a' && *nptr <= 'f') ||
310 (*nptr >= 'A' && *nptr <= 'F') )
313 if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
314 else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
315 else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
320 if( endptr ) *endptr = (char *)nptr;
324 i_value = strtol( nptr, endptr, newbase );
328 return i_value * sign;
332 /*****************************************************************************
333 * atoll: convert a string to a 64 bits int.
334 *****************************************************************************/
335 #if !defined( HAVE_ATOLL )
336 int64_t vlc_atoll( const char *nptr )
338 return strtoll( nptr, (char **)NULL, 10 );
342 /*****************************************************************************
343 * lseek: reposition read/write file offset.
344 *****************************************************************************
345 * FIXME: this cast sucks!
346 *****************************************************************************/
347 #if !defined( HAVE_LSEEK )
348 off_t vlc_lseek( int fildes, off_t offset, int whence )
350 return SetFilePointer( (HANDLE)fildes, (long)offset, NULL, whence );
354 /*****************************************************************************
355 * dgettext: gettext for plugins.
356 *****************************************************************************/
357 char *vlc_dgettext( const char *package, const char *msgid )
359 #if defined( ENABLE_NLS ) \
360 && ( defined(HAVE_GETTEXT) || defined(HAVE_INCLUDED_GETTEXT) )
361 return dgettext( package, msgid );
363 return (char *)msgid;
367 /*****************************************************************************
368 * count_utf8_string: returns the number of characters in the string.
369 *****************************************************************************/
370 static int count_utf8_string( const char *psz_string )
372 int i = 0, i_count = 0;
373 while( psz_string[ i ] != 0 )
375 if( ((unsigned char *)psz_string)[ i ] < 0x80UL ) i_count++;
381 /*****************************************************************************
382 * wraptext: inserts \n at convenient places to wrap the text.
383 * Returns the modified string in a new buffer.
384 *****************************************************************************/
385 char *vlc_wraptext( const char *psz_text, int i_line, vlc_bool_t b_utf8 )
388 char *psz_line, *psz_new_text;
390 psz_line = psz_new_text = strdup( psz_text );
393 i_len = count_utf8_string( psz_text );
395 i_len = strlen( psz_text );
397 while( i_len > i_line )
399 /* Look if there is a newline somewhere. */
400 char *psz_parser = psz_line;
402 while( i_count <= i_line && *psz_parser != '\n' )
406 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
411 if( *psz_parser == '\n' )
413 i_len -= (i_count + 1);
414 psz_line = psz_parser + 1;
418 /* Find the furthest space. */
419 while( psz_parser > psz_line && *psz_parser != ' ' )
423 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser--;
428 if( *psz_parser == ' ' )
431 i_len -= (i_count + 1);
432 psz_line = psz_parser + 1;
436 /* Wrapping has failed. Find the first space or newline */
437 while( i_count < i_len && *psz_parser != ' ' && *psz_parser != '\n' )
441 while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
446 if( i_count < i_len ) *psz_parser = '\n';
447 i_len -= (i_count + 1);
448 psz_line = psz_parser + 1;
454 /*****************************************************************************
456 *****************************************************************************/
457 vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
459 #if defined(HAVE_ICONV)
460 return iconv_open( tocode, fromcode );
466 size_t vlc_iconv( vlc_iconv_t cd, char **inbuf, size_t *inbytesleft,
467 char **outbuf, size_t *outbytesleft )
469 #if defined(HAVE_ICONV)
470 return iconv( cd, inbuf, inbytesleft, outbuf, outbytesleft );
472 int i_bytes = __MIN(*inbytesleft, *outbytesleft);
473 if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
474 memcpy( *outbuf, *inbuf, i_bytes );
477 inbytesleft -= i_bytes;
478 outbytesleft -= i_bytes;
483 int vlc_iconv_close( vlc_iconv_t cd )
485 #if defined(HAVE_ICONV)
486 return iconv_close( cd );
492 /*****************************************************************************
494 * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
495 *****************************************************************************/
496 vlc_bool_t vlc_reduce( int *pi_dst_nom, int *pi_dst_den,
497 int64_t i_nom, int64_t i_den, int64_t i_max )
499 vlc_bool_t b_exact = 1, b_sign = 0;
521 i_gcd = GCD( i_nom, i_den );
525 if( i_max == 0 ) i_max = I64C(0xFFFFFFFF);
527 if( i_nom > i_max || i_den > i_max )
529 int i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
534 int64_t i_x = i_nom / i_den;
535 int64_t i_a2n = i_x * i_a1_num + i_a0_num;
536 int64_t i_a2d = i_x * i_a1_den + i_a0_den;
538 if( i_a2n > i_max || i_a2d > i_max ) break;
542 i_a0_num = i_a1_num; i_a0_den = i_a1_den;
543 i_a1_num = i_a2n; i_a1_den = i_a2d;
544 if( i_nom == 0 ) break;
545 i_x = i_nom; i_nom = i_den; i_den = i_x;
551 if( b_sign ) i_nom = - i_nom;