#34743 [NEW]: fread doesn't move internal "position" pointer. fseek fails as a result

From: alexander dot v at zend dot com Operating system: Linux PHP version: 6CVS-2005-10-05 (CVS) PHP Bug Type: Filesystem function related Bug description: fread doesn't move internal "position" pointer. fseek fails as a result Description: ------------ fread() doesn't move internal file pointer "stream->position" (could be retrived by ftell()). fseek(...,...,SEEK_CUR) fails if crosses buffer boundary as a result. Reproduce code: --------------- // 'testdata.dat' is a binary file. // Each byte contains value equal to offset % 256 $f = fopen('testdata.dat', 'r'); printf( "offset (before read): 0x%X\n", ftell($f) ); $bin_str = fread($f, 16); for ($count = 0; $count < 16; $count++) { printf( "0x%02X ", ord($bin_str{$count}) ); } printf( "\noffset (after read): 0x%X\n.....\n", ftell($f) ); fseek( $f, 16*1024, SEEK_CUR); printf( "offset (before read): 0x%X\n", ftell($f) ); $bin_str = fread($f, 16); for ($count = 0; $count < 16; $count++) { printf( "0x%02X ", ord($bin_str{$count}) ); } printf( "\noffset (after read): 0x%X\n", ftell($f) ); fclose( $f ); Expected result: ---------------- offset (before read): 0x0 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F offset (after read): 0x10 ..... offset (before read): 0x4010 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F offset (after read): 0x4020 Actual result: -------------- offset (before read): 0x0 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F offset (after read): 0x0 ..... offset (before read): 0x4000 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F offset (after read): 0x4000 -- Edit bug report at http://bugs.php.net/?id=34743&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34743&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34743&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34743&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=34743&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=34743&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=34743&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=34743&r=needscript Try newer version: http://bugs.php.net/fix.php?id=34743&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=34743&r=support Expected behavior: http://bugs.php.net/fix.php?id=34743&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=34743&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=34743&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=34743&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34743&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=34743&r=dst IIS Stability: http://bugs.php.net/fix.php?id=34743&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=34743&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=34743&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=34743&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=34743&r=mysqlcfg