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transmission/libtransmission/utils.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <ctype.h>
#include "transmission.h"
#define SPRINTF_BUFSIZE 100
static tr_lock_t * messageLock = NULL;
static int messageLevel = 0;
static int messageQueuing = 0;
static tr_msg_list_t * messageQueue = NULL;
static tr_msg_list_t ** messageQueueTail = &messageQueue;
void tr_msgInit( void )
{
if( NULL == messageLock )
{
messageLock = calloc( 1, sizeof( *messageLock ) );
tr_lockInit( messageLock );
}
}
void tr_setMessageLevel( int level )
{
tr_msgInit();
tr_lockLock( messageLock );
messageLevel = MAX( 0, level );
tr_lockUnlock( messageLock );
}
int tr_getMessageLevel( void )
{
int ret;
tr_msgInit();
tr_lockLock( messageLock );
ret = messageLevel;
tr_lockUnlock( messageLock );
return ret;
}
void tr_setMessageQueuing( int enabled )
{
tr_msgInit();
tr_lockLock( messageLock );
messageQueuing = enabled;
tr_lockUnlock( messageLock );
}
tr_msg_list_t * tr_getQueuedMessages( void )
{
tr_msg_list_t * ret;
assert( NULL != messageLock );
tr_lockLock( messageLock );
ret = messageQueue;
messageQueue = NULL;
messageQueueTail = &messageQueue;
tr_lockUnlock( messageLock );
return ret;
}
void tr_freeMessageList( tr_msg_list_t * list )
{
tr_msg_list_t * next;
while( NULL != list )
{
next = list->next;
free( list->message );
free( list );
list = next;
}
}
void tr_msg( int level, char * msg, ... )
{
va_list args1, args2;
tr_msg_list_t * newmsg;
int len1, len2;
assert( NULL != messageLock );
tr_lockLock( messageLock );
if( !messageLevel )
{
char * env;
env = getenv( "TR_DEBUG" );
messageLevel = ( env ? atoi( env ) : 0 ) + 1;
messageLevel = MAX( 1, messageLevel );
}
if( messageLevel >= level )
{
va_start( args1, msg );
if( messageQueuing )
{
newmsg = calloc( 1, sizeof( *newmsg ) );
if( NULL != newmsg )
{
newmsg->level = level;
newmsg->when = time( NULL );
len1 = len2 = 0;
va_start( args2, msg );
tr_vsprintf( &newmsg->message, &len1, &len2, msg,
args1, args2 );
va_end( args2 );
if( NULL == newmsg->message )
{
free( newmsg );
}
else
{
*messageQueueTail = newmsg;
messageQueueTail = &newmsg->next;
}
}
}
else
{
vfprintf( stderr, msg, args1 );
fputc( '\n', stderr );
}
va_end( args1 );
}
tr_lockUnlock( messageLock );
}
int tr_rand( int sup )
{
static int init = 0;
if( !init )
{
srand( tr_date() );
init = 1;
}
return rand() % sup;
}
void*
tr_memmem( const void* haystack, size_t hl,
const void* needle, size_t nl)
{
const char *walk, *end;
if( !nl )
return (void*) haystack;
if( hl < nl )
return NULL;
for (walk=(const char*)haystack, end=walk+hl-nl; walk!=end; ++walk)
if( !memcmp( walk, needle, nl ) )
return (void*) walk;
return NULL;
}
int tr_mkdir( char * path )
{
char * p, * pp;
struct stat sb;
int done;
p = path;
while( '/' == *p )
p++;
pp = p;
done = 0;
while( ( p = strchr( pp, '/' ) ) || ( p = strchr( pp, '\0' ) ) )
{
if( '\0' == *p)
{
done = 1;
}
else
{
*p = '\0';
}
if( stat( path, &sb ) )
{
/* Folder doesn't exist yet */
if( mkdir( path, 0777 ) )
{
tr_err( "Could not create directory %s (%s)", path,
strerror( errno ) );
*p = '/';
return 1;
}
}
else if( ( sb.st_mode & S_IFMT ) != S_IFDIR )
{
/* Node exists but isn't a folder */
tr_err( "Remove %s, it's in the way.", path );
*p = '/';
return 1;
}
if( done )
{
break;
}
*p = '/';
p++;
pp = p;
}
return 0;
}
int
tr_strncasecmp( const char * s1, const char * s2, size_t n )
{
if ( !n )
return 0;
while( n-- != 0 && tolower( *s1 ) == tolower( *s2 ) ) {
if( !n || !*s1 || !*s2 )
break;
++s1;
++s2;
}
return tolower(*(unsigned char *) s1) - tolower(*(unsigned char *) s2);
}
int tr_sprintf( char ** buf, int * used, int * max, const char * format, ... )
{
va_list ap1, ap2;
int ret;
va_start( ap1, format );
va_start( ap2, format );
ret = tr_vsprintf( buf, used, max, format, ap1, ap2 );
va_end( ap2 );
va_end( ap1 );
return ret;
}
int tr_vsprintf( char ** buf, int * used, int * max, const char * fmt,
va_list ap1, va_list ap2 )
{
int want;
want = vsnprintf( NULL, 0, fmt, ap1 );
if( tr_concat( buf, used, max, NULL, want ) )
{
return 1;
}
assert( *used + want + 1 <= *max );
*used += vsnprintf( *buf + *used, *max - *used, fmt, ap2 );
return 0;
}
int tr_concat( char ** buf, int * used, int * max, const char * data, int len )
{
int newmax;
char * newbuf;
newmax = *max;
while( *used + len + 1 > newmax )
{
newmax += SPRINTF_BUFSIZE;
}
if( newmax > *max )
{
newbuf = realloc( *buf, newmax );
if( NULL == newbuf )
{
return 1;
}
*buf = newbuf;
*max = newmax;
}
if( NULL != data )
{
memcpy( *buf + *used, data, len );
*used += len;
}
return 0;
}
void
tr_buildPath ( char *buf, size_t buflen, const char *first_element, ... )
{
va_list vl;
char* walk = buf;
const char * element = first_element;
va_start( vl, first_element );
for( ;; ) {
const size_t n = strlen( element );
memcpy( walk, element, n );
walk += n;
element = (const char*) va_arg( vl, const char* );
if( element == NULL )
break;
*walk++ = TR_PATH_DELIMITER;
}
*walk = '\0';
assert( walk-buf <= (int)buflen );
}
int
tr_ioErrorFromErrno( void )
{
switch( errno )
{
case EACCES:
case EROFS:
return TR_ERROR_IO_PERMISSIONS;
case ENOSPC:
return TR_ERROR_IO_SPACE;
case EMFILE:
return TR_ERROR_IO_FILE_TOO_BIG;
case EFBIG:
return TR_ERROR_IO_OPEN_FILES;
default:
tr_dbg( "generic i/o errno from errno: %s", strerror( errno ) );
return TR_ERROR_IO_OTHER;
}
}
char *
tr_errorString( int code )
{
switch( code )
{
case TR_OK:
return "No error";
case TR_ERROR:
return "Generic error";
case TR_ERROR_ASSERT:
return "Assert error";
case TR_ERROR_IO_PARENT:
return "Download folder does not exist";
case TR_ERROR_IO_PERMISSIONS:
return "Insufficient permissions";
case TR_ERROR_IO_SPACE:
return "Insufficient free space";
case TR_ERROR_IO_DUP_DOWNLOAD:
return "Already active transfer with same name and download folder";
case TR_ERROR_IO_FILE_TOO_BIG:
return "File too large";
case TR_ERROR_IO_OPEN_FILES:
return "Too many open files";
case TR_ERROR_IO_OTHER:
return "Generic I/O error";
}
return "Unknown error";
}
/****
*****
****/
char*
tr_strdup( const char * in )
{
return tr_strndup( in, in ? strlen(in) : 0 );
}
char*
tr_strndup( const char * in, int len )
{
char * out = NULL;
if( in != NULL )
{
out = tr_calloc( len+1, 1 );
memcpy( out, in, len );
}
return out;
}
void*
tr_calloc( size_t nmemb, size_t size )
{
return nmemb && size ? calloc( nmemb, size ) : NULL;
}
void*
tr_malloc( size_t size )
{
return size ? malloc( size ) : NULL;
}
void*
tr_malloc0( size_t size )
{
void * ret = tr_malloc( size );
memset( ret, 0, size );
return ret;
}
void tr_free( void * p )
{
if( p )
free( p );
}
/****
*****
****/
/* note that the argument is how many bits are needed, not bytes */
tr_bitfield_t*
tr_bitfieldNew( size_t bitcount )
{
tr_bitfield_t * ret = calloc( 1, sizeof(tr_bitfield_t) );
if( NULL == ret )
return NULL;
ret->len = ( bitcount + 7u ) / 8u;
ret->bits = calloc( ret->len, 1 );
if( NULL == ret->bits ) {
free( ret );
return NULL;
}
return ret;
}
tr_bitfield_t*
tr_bitfieldDup( const tr_bitfield_t * in )
{
tr_bitfield_t * ret = calloc( 1, sizeof(tr_bitfield_t) );
ret->len = in->len;
ret->bits = malloc( ret->len );
memcpy( ret->bits, in->bits, ret->len );
return ret;
}
void tr_bitfieldFree( tr_bitfield_t * bitfield )
{
if( bitfield )
{
free( bitfield->bits );
free( bitfield );
}
}
void
tr_bitfieldClear( tr_bitfield_t * bitfield )
{
memset( bitfield->bits, 0, bitfield->len );
}
int
tr_bitfieldIsEmpty( const tr_bitfield_t * bitfield )
{
unsigned int i;
for( i=0; i<bitfield->len; ++i )
if( *bitfield->bits )
return 0;
return 1;
}
static const uint8_t bitmask[8] = { 128u, 64u, 32u, 16u, 8u, 4u, 2u, 1u };
int
tr_bitfieldHas( const tr_bitfield_t * bitfield,
size_t bit )
{
if ( bitfield == NULL ) return 0;
assert( bit / 8u < bitfield->len );
return ( bitfield->bits[ bit/8u ] & bitmask[bit%8] );
}
void
tr_bitfieldAdd( tr_bitfield_t * bitfield, size_t bit )
{
assert( bit / 8u < bitfield->len );
bitfield->bits[ bit/8u ] |= bitmask[bit%8];
}
void
tr_bitfieldAddRange( tr_bitfield_t * bitfield,
size_t first,
size_t last )
{
/* TODO: there are faster ways to do this */
unsigned int i;
for( i=first; i<=last; ++i )
tr_bitfieldAdd( bitfield, i );
}
void
tr_bitfieldRem( tr_bitfield_t * bitfield,
size_t bit )
{
if( bitfield != NULL )
{
assert( bit / 8u < bitfield->len );
bitfield->bits[bit/8u] &= ~bitmask[bit%8];
}
}
void
tr_bitfieldRemRange ( tr_bitfield_t * b,
size_t first,
size_t last )
{
/* TODO: there are faster ways to do this */
unsigned int i;
for( i=first; i<=last; ++i )
tr_bitfieldRem( b, i );
}
tr_bitfield_t*
tr_bitfieldNegate( tr_bitfield_t * b )
{
uint8_t *it;
const uint8_t *end;
for( it=b->bits, end=it+b->len; it!=end; ++it )
*it = ~*it;
return b;
}
tr_bitfield_t*
tr_bitfieldAnd( tr_bitfield_t * a, const tr_bitfield_t * b )
{
uint8_t *ait;
const uint8_t *aend, *bit;
assert( a->len == b->len );
for( ait=a->bits, bit=b->bits, aend=ait+a->len; ait!=aend; ++ait, ++bit )
*ait &= *bit;
return a;
}
size_t
tr_bitfieldCountTrueBits( const tr_bitfield_t* b )
{
size_t ret = 0;
const uint8_t *it, *end;
static const int trueBitCount[512] = {
0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,
1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,
2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,
3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,
4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,5,6,6,7,6,7,7,8,6,7,7,8,7,8,8,9
};
for( it=b->bits, end=it+b->len; it!=end; ++it )
ret += trueBitCount[*it];
return ret;
}
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