libc.c
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上传日期:2009-03-27
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文件大小:19k
- /*****************************************************************************
- * libc.c: Extra libc function for some systems.
- *****************************************************************************
- * Copyright (C) 2002 VideoLAN
- * $Id: libc.c 9292 2004-11-12 10:44:50Z gbazin $
- *
- * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
- * Samuel Hocevar <sam@zoy.org>
- * Gildas Bazin <gbazin@videolan.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- #include <string.h> /* strdup() */
- #include <stdlib.h>
- #include <ctype.h>
- #include <vlc/vlc.h>
- #undef iconv_t
- #undef iconv_open
- #undef iconv
- #undef iconv_close
- #if defined(HAVE_ICONV)
- # include <iconv.h>
- #endif
- /*****************************************************************************
- * getenv: just in case, but it should never be called
- *****************************************************************************/
- #if !defined( HAVE_GETENV )
- char *vlc_getenv( const char *name )
- {
- return NULL;
- }
- #endif
- /*****************************************************************************
- * strdup: returns a malloc'd copy of a string
- *****************************************************************************/
- #if !defined( HAVE_STRDUP )
- char *vlc_strdup( const char *string )
- {
- return strndup( string, strlen( string ) );
- }
- #endif
- /*****************************************************************************
- * strndup: returns a malloc'd copy of at most n bytes of string
- * Does anyone know whether or not it will be present in Jaguar?
- *****************************************************************************/
- #if !defined( HAVE_STRNDUP )
- char *vlc_strndup( const char *string, size_t n )
- {
- char *psz;
- size_t len = strlen( string );
- len = __MIN( len, n );
- psz = (char*)malloc( len + 1 );
- if( psz != NULL )
- {
- memcpy( (void*)psz, (const void*)string, len );
- psz[ len ] = 0;
- }
- return psz;
- }
- #endif
- /*****************************************************************************
- * strcasecmp: compare two strings ignoring case
- *****************************************************************************/
- #if !defined( HAVE_STRCASECMP ) && !defined( HAVE_STRICMP )
- int vlc_strcasecmp( const char *s1, const char *s2 )
- {
- int i_delta = 0;
- if( !s1 || !s2 ) return -1;
- while( !i_delta && *s1 && *s2 )
- {
- i_delta = *s1 - *s2;
- if( *s1 >= 'A' && *s1 <= 'Z' )
- {
- i_delta -= ('A' - 'a');
- }
- if( *s2 >= 'A' && *s2 <= 'Z' )
- {
- i_delta += ('A' - 'a');
- }
- s1++; s2++;
- }
- if( !i_delta && (*s1 || *s2) ) i_delta = *s1 ? 1 : -1;
- return i_delta;
- }
- #endif
- /*****************************************************************************
- * strncasecmp: compare n chars from two strings ignoring case
- *****************************************************************************/
- #if !defined( HAVE_STRNCASECMP ) && !defined( HAVE_STRNICMP )
- int vlc_strncasecmp( const char *s1, const char *s2, size_t n )
- {
- int i_delta = 0;
- if( !s1 || !s2 ) return -1;
- while( n-- && !i_delta && *s1 && *s2 )
- {
- i_delta = *s1 - *s2;
- if( *s1 >= 'A' && *s1 <= 'Z' )
- {
- i_delta -= 'A' - 'a';
- }
- if( *s2 >= 'A' && *s2 <= 'Z' )
- {
- i_delta += 'A' - 'a';
- }
- s1++; s2++;
- }
- if( !n && !i_delta && (*s1 || *s2) ) i_delta = *s1 ? 1 : -1;
- return i_delta;
- }
- #endif
- /******************************************************************************
- * strcasestr: find a substring (little) in another substring (big)
- * Case sensitive. Return NULL if not found, return big if little == null
- *****************************************************************************/
- #if !defined( HAVE_STRCASESTR ) && !defined( HAVE_STRISTR )
- char * vlc_strcasestr( const char *psz_big, const char *psz_little )
- {
- char *p_pos = (char *)psz_big;
- if( !psz_big || !psz_little || !*psz_little ) return p_pos;
-
- while( *p_pos )
- {
- if( toupper( *p_pos ) == toupper( *psz_little ) )
- {
- char * psz_cur1 = p_pos + 1;
- char * psz_cur2 = (char *)psz_little + 1;
- while( *psz_cur1 && *psz_cur2 &&
- toupper( *psz_cur1 ) == toupper( *psz_cur2 ) )
- {
- psz_cur1++;
- psz_cur2++;
- }
- if( !*psz_cur2 ) return p_pos;
- }
- p_pos++;
- }
- return NULL;
- }
- #endif
- /*****************************************************************************
- * vasprintf:
- *****************************************************************************/
- #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
- int vlc_vasprintf(char **strp, const char *fmt, va_list ap)
- {
- /* Guess we need no more than 100 bytes. */
- int i_size = 100;
- char *p = malloc( i_size );
- int n;
- if( p == NULL )
- {
- *strp = NULL;
- return -1;
- }
- for( ;; )
- {
- /* Try to print in the allocated space. */
- n = vsnprintf( p, i_size, fmt, ap );
- /* If that worked, return the string. */
- if (n > -1 && n < i_size)
- {
- *strp = p;
- return strlen( p );
- }
- /* Else try again with more space. */
- if (n > -1) /* glibc 2.1 */
- {
- i_size = n+1; /* precisely what is needed */
- }
- else /* glibc 2.0 */
- {
- i_size *= 2; /* twice the old size */
- }
- if( (p = realloc( p, i_size ) ) == NULL)
- {
- *strp = NULL;
- return -1;
- }
- }
- }
- #endif
- /*****************************************************************************
- * asprintf:
- *****************************************************************************/
- #if !defined(HAVE_ASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
- int vlc_asprintf( char **strp, const char *fmt, ... )
- {
- va_list args;
- int i_ret;
- va_start( args, fmt );
- i_ret = vasprintf( strp, fmt, args );
- va_end( args );
- return i_ret;
- }
- #endif
- /*****************************************************************************
- * atof: convert a string to a double.
- *****************************************************************************/
- #if !defined( HAVE_ATOF )
- double vlc_atof( const char *nptr )
- {
- double f_result;
- wchar_t *psz_tmp;
- int i_len = strlen( nptr ) + 1;
- psz_tmp = malloc( i_len * sizeof(wchar_t) );
- MultiByteToWideChar( CP_ACP, 0, nptr, -1, psz_tmp, i_len );
- f_result = wcstod( psz_tmp, NULL );
- free( psz_tmp );
- return f_result;
- }
- #endif
- /*****************************************************************************
- * strtoll: convert a string to a 64 bits int.
- *****************************************************************************/
- #if !defined( HAVE_STRTOLL )
- int64_t vlc_strtoll( const char *nptr, char **endptr, int base )
- {
- int64_t i_value = 0;
- int sign = 1, newbase = base ? base : 10;
- while( isspace(*nptr) ) nptr++;
- if( *nptr == '-' )
- {
- sign = -1;
- nptr++;
- }
- /* Try to detect base */
- if( *nptr == '0' )
- {
- newbase = 8;
- nptr++;
- if( *nptr == 'x' )
- {
- newbase = 16;
- nptr++;
- }
- }
- if( base && newbase != base )
- {
- if( endptr ) *endptr = (char *)nptr;
- return i_value;
- }
- switch( newbase )
- {
- case 10:
- while( *nptr >= '0' && *nptr <= '9' )
- {
- i_value *= 10;
- i_value += ( *nptr++ - '0' );
- }
- if( endptr ) *endptr = (char *)nptr;
- break;
- case 16:
- while( (*nptr >= '0' && *nptr <= '9') ||
- (*nptr >= 'a' && *nptr <= 'f') ||
- (*nptr >= 'A' && *nptr <= 'F') )
- {
- int i_valc = 0;
- if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
- else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
- else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
- i_value *= 16;
- i_value += i_valc;
- nptr++;
- }
- if( endptr ) *endptr = (char *)nptr;
- break;
- default:
- i_value = strtol( nptr, endptr, newbase );
- break;
- }
- return i_value * sign;
- }
- #endif
- /*****************************************************************************
- * atoll: convert a string to a 64 bits int.
- *****************************************************************************/
- #if !defined( HAVE_ATOLL )
- int64_t vlc_atoll( const char *nptr )
- {
- return strtoll( nptr, (char **)NULL, 10 );
- }
- #endif
- /*****************************************************************************
- * lseek: reposition read/write file offset.
- *****************************************************************************
- * FIXME: this cast sucks!
- *****************************************************************************/
- #if !defined( HAVE_LSEEK )
- off_t vlc_lseek( int fildes, off_t offset, int whence )
- {
- return SetFilePointer( (HANDLE)fildes, (long)offset, NULL, whence );
- }
- #endif
- /*****************************************************************************
- * dgettext: gettext for plugins.
- *****************************************************************************/
- char *vlc_dgettext( const char *package, const char *msgid )
- {
- #if defined( ENABLE_NLS )
- && ( defined(HAVE_GETTEXT) || defined(HAVE_INCLUDED_GETTEXT) )
- return dgettext( package, msgid );
- #else
- return (char *)msgid;
- #endif
- }
- /*****************************************************************************
- * count_utf8_string: returns the number of characters in the string.
- *****************************************************************************/
- static int count_utf8_string( const char *psz_string )
- {
- int i = 0, i_count = 0;
- while( psz_string[ i ] != 0 )
- {
- if( ((unsigned char *)psz_string)[ i ] < 0x80UL ) i_count++;
- i++;
- }
- return i_count;
- }
- /*****************************************************************************
- * wraptext: inserts n at convenient places to wrap the text.
- * Returns the modified string in a new buffer.
- *****************************************************************************/
- char *vlc_wraptext( const char *psz_text, int i_line, vlc_bool_t b_utf8 )
- {
- int i_len;
- char *psz_line, *psz_new_text;
- psz_line = psz_new_text = strdup( psz_text );
- if( b_utf8 )
- i_len = count_utf8_string( psz_text );
- else
- i_len = strlen( psz_text );
- while( i_len > i_line )
- {
- /* Look if there is a newline somewhere. */
- char *psz_parser = psz_line;
- int i_count = 0;
- while( i_count <= i_line && *psz_parser != 'n' )
- {
- if( b_utf8 )
- {
- while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
- }
- psz_parser++;
- i_count++;
- }
- if( *psz_parser == 'n' )
- {
- i_len -= (i_count + 1);
- psz_line = psz_parser + 1;
- continue;
- }
- /* Find the furthest space. */
- while( psz_parser > psz_line && *psz_parser != ' ' )
- {
- if( b_utf8 )
- {
- while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser--;
- }
- psz_parser--;
- i_count--;
- }
- if( *psz_parser == ' ' )
- {
- *psz_parser = 'n';
- i_len -= (i_count + 1);
- psz_line = psz_parser + 1;
- continue;
- }
- /* Wrapping has failed. Find the first space or newline */
- while( i_count < i_len && *psz_parser != ' ' && *psz_parser != 'n' )
- {
- if( b_utf8 )
- {
- while( *((unsigned char *)psz_parser) >= 0x80UL ) psz_parser++;
- }
- psz_parser++;
- i_count++;
- }
- if( i_count < i_len ) *psz_parser = 'n';
- i_len -= (i_count + 1);
- psz_line = psz_parser + 1;
- }
- return psz_new_text;
- }
- /*****************************************************************************
- * iconv wrapper
- *****************************************************************************/
- vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
- {
- #if defined(HAVE_ICONV)
- return iconv_open( tocode, fromcode );
- #else
- return NULL;
- #endif
- }
- size_t vlc_iconv( vlc_iconv_t cd, char **inbuf, size_t *inbytesleft,
- char **outbuf, size_t *outbytesleft )
- {
- #if defined(HAVE_ICONV)
- return iconv( cd, inbuf, inbytesleft, outbuf, outbytesleft );
- #else
- int i_bytes = __MIN(*inbytesleft, *outbytesleft);
- if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
- memcpy( *outbuf, *inbuf, i_bytes );
- inbuf += i_bytes;
- outbuf += i_bytes;
- inbytesleft -= i_bytes;
- outbytesleft -= i_bytes;
- return i_bytes;
- #endif
- }
- int vlc_iconv_close( vlc_iconv_t cd )
- {
- #if defined(HAVE_ICONV)
- return iconv_close( cd );
- #else
- return 0;
- #endif
- }
- /*****************************************************************************
- * reduce a fraction
- * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
- *****************************************************************************/
- vlc_bool_t vlc_reduce( int *pi_dst_nom, int *pi_dst_den,
- int64_t i_nom, int64_t i_den, int64_t i_max )
- {
- vlc_bool_t b_exact = 1, b_sign = 0;
- int64_t i_gcd;
- if( i_den == 0 )
- {
- *pi_dst_nom = 0;
- *pi_dst_den = 1;
- return 1;
- }
- if( i_den < 0 )
- {
- i_den = - i_den;
- i_nom = - i_nom;
- }
- if( i_nom < 0 )
- {
- i_nom = - i_nom;
- b_sign = 1;
- }
- i_gcd = GCD( i_nom, i_den );
- i_nom /= i_gcd;
- i_den /= i_gcd;
- if( i_max == 0 ) i_max = I64C(0xFFFFFFFF);
- if( i_nom > i_max || i_den > i_max )
- {
- int i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
- b_exact = 0;
- for( ; ; )
- {
- int64_t i_x = i_nom / i_den;
- int64_t i_a2n = i_x * i_a1_num + i_a0_num;
- int64_t i_a2d = i_x * i_a1_den + i_a0_den;
- if( i_a2n > i_max || i_a2d > i_max ) break;
- i_nom %= i_den;
- i_a0_num = i_a1_num; i_a0_den = i_a1_den;
- i_a1_num = i_a2n; i_a1_den = i_a2d;
- if( i_nom == 0 ) break;
- i_x = i_nom; i_nom = i_den; i_den = i_x;
- }
- i_nom = i_a1_num;
- i_den = i_a1_den;
- }
- if( b_sign ) i_nom = - i_nom;
- *pi_dst_nom = i_nom;
- *pi_dst_den = i_den;
- return b_exact;
- }
- /*************************************************************************
- * vlc_parse_cmdline: Command line parsing into elements.
- *
- * The command line is composed of space/tab separated arguments.
- * Quotes can be used as argument delimiters and a backslash can be used to
- * escape a quote.
- *************************************************************************/
- static void find_end_quote( char **s, char **ppsz_parser, int i_quote )
- {
- int i_bcount = 0;
- while( **s )
- {
- if( **s == '\' )
- {
- **ppsz_parser = **s;
- (*ppsz_parser)++; (*s)++;
- i_bcount++;
- }
- else if( **s == '"' || **s == ''' )
- {
- /* Preceeded by a number of '' which we erase. */
- *ppsz_parser -= i_bcount / 2;
- if( i_bcount & 1 )
- {
- /* '\' followed by a '"' or ''' */
- *ppsz_parser -= 1;
- **ppsz_parser = **s;
- (*ppsz_parser)++; (*s)++;
- i_bcount = 0;
- continue;
- }
- if( **s == i_quote )
- {
- /* End */
- return;
- }
- else
- {
- /* Different quoting */
- int i_quote = **s;
- **ppsz_parser = **s;
- (*ppsz_parser)++; (*s)++;
- find_end_quote( s, ppsz_parser, i_quote );
- **ppsz_parser = **s;
- (*ppsz_parser)++; (*s)++;
- }
- i_bcount = 0;
- }
- else
- {
- /* A regular character */
- **ppsz_parser = **s;
- (*ppsz_parser)++; (*s)++;
- i_bcount = 0;
- }
- }
- }
- char **vlc_parse_cmdline( const char *psz_cmdline, int *i_args )
- {
- int argc = 0;
- char **argv = 0;
- char *s, *psz_parser, *psz_arg, *psz_orig;
- int i_bcount = 0;
- if( !psz_cmdline ) return 0;
- psz_orig = strdup( psz_cmdline );
- psz_arg = psz_parser = s = psz_orig;
- while( *s )
- {
- if( *s == 't' || *s == ' ' )
- {
- /* We have a complete argument */
- *psz_parser = 0;
- TAB_APPEND( argc, argv, strdup(psz_arg) );
- /* Skip trailing spaces/tabs */
- do{ s++; } while( *s == 't' || *s == ' ' );
- /* New argument */
- psz_arg = psz_parser = s;
- i_bcount = 0;
- }
- else if( *s == '\' )
- {
- *psz_parser++ = *s++;
- i_bcount++;
- }
- else if( *s == '"' || *s == ''' )
- {
- if( ( i_bcount & 1 ) == 0 )
- {
- /* Preceeded by an even number of '', this is half that
- * number of '', plus a quote which we erase. */
- int i_quote = *s;
- psz_parser -= i_bcount / 2;
- s++;
- find_end_quote( &s, &psz_parser, i_quote );
- s++;
- }
- else
- {
- /* Preceeded by an odd number of '', this is half that
- * number of '' followed by a '"' */
- psz_parser = psz_parser - i_bcount/2 - 1;
- *psz_parser++ = '"';
- s++;
- }
- i_bcount = 0;
- }
- else
- {
- /* A regular character */
- *psz_parser++ = *s++;
- i_bcount = 0;
- }
- }
- /* Take care of the last arg */
- if( *psz_arg )
- {
- *psz_parser = ' ';
- TAB_APPEND( argc, argv, strdup(psz_arg) );
- }
- if( i_args ) *i_args = argc;
- free( psz_orig );
- return argv;
- }