723 lines
22 KiB
C
723 lines
22 KiB
C
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/* m4file.c (c)Copyright Sequiter Software Inc., 1988-1996. All rights reserved. */
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#include "d4all.h"
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#ifndef S4UNIX
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#ifdef __TURBOC__
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#pragma hdrstop
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#endif
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#endif
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#ifndef S4CLIENT
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#ifndef S4MEMO_OFF
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#ifndef S4OFF_MULTI
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/* ndx/clipper versions have no free chain--do not lock memo file */
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#ifndef N4OTHER
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/* the lock is forced since a memo file lock only lasts if the .dbf file is locked */
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int memo4fileLock( MEMO4FILE *f4memo )
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{
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int rc, oldAttempts ;
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if ( f4memo->fileLock == 1 )
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return 0 ;
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if ( f4memo->file.hand == -1 )
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return -1 ;
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oldAttempts = f4memo->file.codeBase->lockAttempts ;
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f4memo->file.codeBase->lockAttempts = WAIT4EVER ;
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#ifdef S4MDX
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rc = file4lock( &f4memo->file, L4LOCK_POS - 1L, 2L ) ;
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#endif
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#ifdef S4FOX
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rc = file4lock( &f4memo->file, L4LOCK_POS_OLD, 1L ) ;
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#endif
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f4memo->file.codeBase->lockAttempts = oldAttempts ;
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if ( rc == 0 )
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f4memo->fileLock = 1 ;
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#ifndef S4OPTIMIZE_OFF
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file4refresh( &f4memo->file ) ; /* make sure all up to date */
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#endif
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return rc ;
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}
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int memo4fileUnlock( MEMO4FILE *f4memo )
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{
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int rc ;
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if ( f4memo->fileLock == 0 )
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return 0 ;
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#ifdef S4MDX
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rc = file4unlock( &f4memo->file, L4LOCK_POS - 1L, 2L ) ;
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#endif
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#ifdef S4FOX
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rc = file4unlock( &f4memo->file, L4LOCK_POS_OLD, 1L ) ;
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#endif
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if ( rc == 0 )
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f4memo->fileLock = 0 ;
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return rc ;
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}
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#endif
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#endif
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int memo4fileOpen( MEMO4FILE *f4memo, DATA4FILE *d4, char *name )
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{
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MEMO4HEADER header ;
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int rc ;
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f4memo->data = d4 ;
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if ( file4open( &f4memo->file, d4->c4, name, 1 ) )
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return -1 ;
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#ifndef S4OPTIMIZE_OFF
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file4optimize( &f4memo->file, d4->c4->optimize, OPT4OTHER ) ;
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#endif
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if ( (rc = file4readAll(&f4memo->file, 0L, &header, sizeof(header))) < 0 )
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return -1 ;
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#ifdef S4BYTE_SWAP
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header.nextBlock = x4reverseLong( (void *)&header.nextBlock ) ;
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#ifndef S4MNDX
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#ifndef S4MFOX
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header.x102 = 0x201 ;
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#endif
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header.blockSize = x4reverseShort( (void *)&header.blockSize ) ;
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#endif
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#endif
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#ifdef S4MFOX
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f4memo->blockSize = x4reverseShort( (void *)&header.blockSize ) ;
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#else
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#ifdef S4MNDX
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f4memo->blockSize = MEMO4SIZE ;
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#else
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f4memo->blockSize = header.blockSize ;
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#endif
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#endif
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return rc ;
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}
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#ifdef S4MFOX
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/* offset is # bytes from start of memo that reading should begin, readMax is
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the maximum possible that can be read (limited to an unsigned int, so is
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16-bit/32-bit compiler dependent.
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*/
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int memo4fileReadPart( MEMO4FILE *f4memo, long memoId, char **ptrPtr, unsigned *lenPtr, unsigned long offset, const unsigned readMax, long *type )
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{
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unsigned long pos, avail ;
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MEMO4BLOCK memoBlock ;
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if ( memoId <= 0L )
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{
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*lenPtr = 0 ;
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return 0 ;
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}
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pos = (unsigned long)memoId * f4memo->blockSize ;
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if ( file4readAll( &f4memo->file, pos, &memoBlock, sizeof( MEMO4BLOCK ) ) < 0)
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return -1 ;
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#ifdef S4BYTE_SWAP
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#ifdef S4MFOX
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memoBlock.type = x4reverseLong( (void *)&memoBlock.type ) ;
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#else
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memoBlock.startPos = x4reverseShort( (void *)&memoBlock.startPos ) ;
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#endif
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memoBlock.numChars = x4reverseLong( (void *)&memoBlock.numChars ) ;
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#endif
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memoBlock.numChars = x4reverseLong( (void *)&memoBlock.numChars ) ;
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avail = memoBlock.numChars - offset ;
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if ( avail > (unsigned long)readMax )
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avail = readMax ;
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if ( avail > (unsigned long)*lenPtr )
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{
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if ( *lenPtr > 0 )
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u4free( *ptrPtr ) ;
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*ptrPtr = (char *)u4allocEr( f4memo->file.codeBase, avail + 1 ) ;
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if ( *ptrPtr == 0 )
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return e4memory ;
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}
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*lenPtr = (unsigned)avail ;
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*type = x4reverseLong( &memoBlock.type ) ;
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return (int)file4readAll( &f4memo->file, offset + pos + (long)(2*sizeof(S4LONG)), *ptrPtr, *lenPtr ) ;
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}
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#endif
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#ifdef S4MNDX
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extern char f4memoNullChar ;
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#endif
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#ifdef S4MFOX
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int memo4fileRead( MEMO4FILE *f4memo, long memoId, char **ptrPtr, unsigned int *ptrLen, long *mType )
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#else
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int memo4fileRead( MEMO4FILE *f4memo, long memoId, char **ptrPtr, unsigned int *ptrLen )
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#endif
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{
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#ifdef S4MFOX
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return memo4fileReadPart( f4memo, memoId, ptrPtr, ptrLen, 0L, UINT_MAX -100, mType ) ;
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#else
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long pos ;
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CODE4 *c4 ;
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#ifdef S4MNDX
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unsigned int amtRead, lenRead, loop ;
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char *tPtr ;
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#else
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MEMO4BLOCK memoBlock ;
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unsigned finalLen ;
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#endif
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c4 = f4memo->file.codeBase ;
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#ifdef S4MNDX
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if ( memoId <= 0L )
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{
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if ( *ptrPtr != &f4memoNullChar )
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u4free( *ptrPtr ) ;
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*ptrPtr = 0 ;
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*ptrLen = 0 ;
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return 0 ;
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}
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pos = memoId * f4memo->blockSize ;
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amtRead = 0 ;
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if ( c4->memoUseBuffer == 0 )
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{
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c4->memoUseBuffer = (char*)u4allocEr( c4, MEMO4SIZE ) ;
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if ( c4->memoUseBuffer == 0 )
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return e4memory ;
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}
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for( amtRead = 0 ;; )
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{
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lenRead = file4read( &f4memo->file, pos + amtRead, c4->memoUseBuffer, MEMO4SIZE ) ;
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if ( lenRead <= 0 )
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return -1 ;
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for ( loop = 0 ; lenRead > 0 ; loop++, lenRead-- )
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{
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if ( c4->memoUseBuffer[loop] == 0x1A ) /* if done */
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{
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if ( loop + amtRead > 0 )
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{
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if ( *ptrLen < amtRead + loop )
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{
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tPtr = (char *)u4allocEr( c4, amtRead + loop + 1 ) ;
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if ( tPtr == 0 )
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return e4memory ;
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memcpy( tPtr, *ptrPtr, (int)amtRead ) ;
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if ( *ptrPtr != &f4memoNullChar )
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u4free( *ptrPtr ) ;
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*ptrPtr = tPtr ;
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}
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*ptrLen = amtRead + loop ;
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memcpy( *ptrPtr + amtRead, c4->memoUseBuffer, loop ) ;
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(*ptrPtr)[amtRead+loop] = 0 ;
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return 0 ;
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}
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else
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{
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tPtr = 0 ;
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if ( *ptrPtr != &f4memoNullChar )
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u4free( *ptrPtr ) ;
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*ptrPtr = 0 ;
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*ptrLen = 0 ;
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}
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return 0 ;
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}
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}
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lenRead = loop ;
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if ( *ptrLen < amtRead + lenRead )
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{
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tPtr = (char *)u4allocEr( c4, amtRead + lenRead + 1 ) ;
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if ( tPtr == 0 )
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return e4memory ;
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if ( *ptrLen > 0 )
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{
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memcpy( tPtr, *ptrPtr, *ptrLen ) ;
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u4free( *ptrPtr ) ;
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}
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*ptrPtr = tPtr ;
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*ptrLen = (unsigned)( amtRead + lenRead ) ;
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}
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memcpy( *ptrPtr + amtRead, c4->memoUseBuffer, lenRead ) ;
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amtRead += lenRead ;
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}
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#else
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if ( memoId <= 0L )
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{
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*ptrLen = 0 ;
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return 0 ;
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}
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pos = memoId * f4memo->blockSize ;
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if ( file4readAll( &f4memo->file, pos, &memoBlock, sizeof( MEMO4BLOCK ) ) < 0)
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return -1 ;
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#ifdef S4BYTE_SWAP
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memoBlock.startPos = x4reverseShort( (void *)&memoBlock.startPos ) ;
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memoBlock.numChars = x4reverseLong( (void *)&memoBlock.numChars ) ;
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#endif
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if ( memoBlock.minusOne != -1 ) /* must be an invalid entry, so return an empty entry */
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{
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*ptrLen = 0 ;
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return 0 ;
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}
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else
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{
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if ( memoBlock.numChars >= UINT_MAX )
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return error4( c4, e4info, E95210 ) ;
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finalLen = (unsigned)memoBlock.numChars - 2 * ( sizeof(short) ) - ( sizeof(S4LONG) ) ;
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if ( finalLen > *ptrLen )
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{
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if ( *ptrLen > 0 )
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u4free( *ptrPtr ) ;
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*ptrPtr = (char *)u4allocEr( c4, finalLen + 1 ) ;
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if ( *ptrPtr == 0 )
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return e4memory ;
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}
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*ptrLen = finalLen ;
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return file4readAll( &f4memo->file, pos+ memoBlock.startPos, *ptrPtr, finalLen ) ;
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}
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#endif
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#endif
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}
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#ifndef S4OFF_WRITE
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#ifdef S4MFOX
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/* Writes partial data to a memo record.
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Usage rules:
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Must call this function with an offset == 0 to write 1st part of block
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before any additional writing. In addition, the memoLen must be
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accurately set during the first call in order to reserve the correct
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amount of memo space ahead of time. Later calls just fill in data to
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the reserved disk space.
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lenWrite is the amount of data to write, offset is the number of
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bytes from the beginning of the memo in which to write the data
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Secondary calls to this function assume that everything has been
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previously set up, and merely performs a file write to the reserved
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space. The space is not checked to see whether or not it actually
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is in the bounds specified, so use with care.
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*/
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int memo4fileWritePart( MEMO4FILE *f4memo, long *memoIdPtr, const char *ptr, const long memoLen, const long offset, const unsigned lenWrite, const long type )
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{
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int strNumBlocks ;
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long pos ;
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#ifndef S4OFF_MULTI
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#ifndef N4OTHER
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int rc, lockCond ;
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#endif
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#endif
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MEMO4BLOCK oldMemoBlock ;
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MEMO4HEADER mh ;
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unsigned lenRead ;
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long blockNo ;
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unsigned nEntryBlks = 0 ;
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#ifdef E4PARM_LOW
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if ( memoIdPtr == 0 )
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return error4( 0, e4parm_null, E95208 ) ;
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if ( f4memo->file.hand == -1 ) /* file closed! */
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return error4( 0, e4parm, E95208 ) ;
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#endif
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if ( offset == 0 ) /* must do the set-up work */
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{
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if ( memoLen == 0 )
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{
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*memoIdPtr = 0L ;
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return 0 ;
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}
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#ifdef E4MISC
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if ( f4memo->blockSize <= 1 )
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return error4( f4memo->data->c4, e4info, E85202 ) ;
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#endif
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strNumBlocks = (int) ((memoLen + sizeof(MEMO4BLOCK) + f4memo->blockSize-1) / f4memo->blockSize) ;
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if ( *memoIdPtr <= 0L )
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blockNo = 0L ;
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else
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{
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blockNo = *memoIdPtr ;
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pos = blockNo * f4memo->blockSize ;
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file4readAll( &f4memo->file, pos, (char *)&oldMemoBlock, sizeof(oldMemoBlock) ) ;
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||
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#ifdef S4BYTE_SWAP
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#ifdef S4MFOX
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||
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oldMemoBlock.type = x4reverseLong( (void *)&oldMemoBlock.type ) ;
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||
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#else
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oldMemoBlock.startPos = x4reverseShort( (void *)&oldMemoBlock.startPos ) ;
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||
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#endif
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||
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oldMemoBlock.numChars = x4reverseLong( (void *)&oldMemoBlock.numChars ) ;
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||
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#endif
|
||
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||
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oldMemoBlock.numChars = x4reverseLong( (void *)&oldMemoBlock.numChars ) ;
|
||
|
|
nEntryBlks = (unsigned) ((oldMemoBlock.numChars + f4memo->blockSize-1)/ f4memo->blockSize ) ;
|
||
|
|
}
|
||
|
|
if ( nEntryBlks >= ((unsigned)strNumBlocks) && blockNo ) /* write to existing position */
|
||
|
|
*memoIdPtr = blockNo ;
|
||
|
|
else /* read in header record */
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
lockCond = f4memo->data->memoFile.fileLock ;
|
||
|
|
rc = memo4fileLock( &f4memo->data->memoFile ) ;
|
||
|
|
if ( rc )
|
||
|
|
return rc ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
lenRead = file4read( &f4memo->file, 0L, &mh, sizeof( mh ) ) ;
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
mh.blockSize = x4reverseShort( (void *)&mh.blockSize ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
if ( error4code( f4memo->data->c4 ) < 0 )
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
return -1 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( lenRead != sizeof( mh ) )
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
return file4readError( &f4memo->file, 0L, sizeof( mh ), "memo4fileWritePart" ) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
*memoIdPtr = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
mh.nextBlock = *memoIdPtr + strNumBlocks ;
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
mh.blockSize = x4reverseShort( (void *)&mh.blockSize ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
file4write( &f4memo->file, 0L, &mh, sizeof( mh ) ) ;
|
||
|
|
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
if ( memo4fileDump( f4memo, *memoIdPtr, ptr, lenWrite, memoLen, type ) < 0 )
|
||
|
|
return -1 ;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
return file4write( &f4memo->file, *memoIdPtr * f4memo->blockSize + offset + sizeof( oldMemoBlock ), ptr, lenWrite ) ;
|
||
|
|
|
||
|
|
return 0 ;
|
||
|
|
}
|
||
|
|
#endif /* S4MFOX */
|
||
|
|
|
||
|
|
int memo4fileWrite( MEMO4FILE *f4memo, long *memoIdPtr, const char *ptr, const unsigned ptrLen )
|
||
|
|
{
|
||
|
|
#ifdef S4MFOX
|
||
|
|
return memo4fileWritePart( f4memo, memoIdPtr, ptr, (long)ptrLen, 0L, ptrLen, 1L ) ;
|
||
|
|
#else
|
||
|
|
int strNumBlocks ;
|
||
|
|
long pos ;
|
||
|
|
#ifndef S4MDX
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
int rc, lockCond ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#ifdef S4MNDX
|
||
|
|
MEMO4HEADER mh ;
|
||
|
|
long lenRead ;
|
||
|
|
char buf[MEMO4SIZE] ;
|
||
|
|
int readSize, i ;
|
||
|
|
#else
|
||
|
|
MEMO4BLOCK oldMemoBlock ;
|
||
|
|
MEMO4CHAIN_ENTRY newEntry, cur, prev ;
|
||
|
|
int strWritten ;
|
||
|
|
long prevPrevEntry, prevPrevNum ;
|
||
|
|
long fileLen, extraLen ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef E4PARM_LOW
|
||
|
|
if ( memoIdPtr == 0 )
|
||
|
|
return error4( 0, e4parm_null, E95209 ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef S4MNDX
|
||
|
|
if ( ptrLen == 0 )
|
||
|
|
{
|
||
|
|
*memoIdPtr = 0L ;
|
||
|
|
return 0 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
strNumBlocks = (int)(((long)ptrLen + f4memo->blockSize-1) / f4memo->blockSize) ;
|
||
|
|
|
||
|
|
if ( *memoIdPtr <= 0L )
|
||
|
|
*memoIdPtr = 0L ;
|
||
|
|
else /* read in old record to see if new entry can fit */
|
||
|
|
{
|
||
|
|
readSize = 0 ;
|
||
|
|
pos = *memoIdPtr * f4memo->blockSize ;
|
||
|
|
|
||
|
|
do
|
||
|
|
{
|
||
|
|
readSize += MEMO4SIZE ;
|
||
|
|
|
||
|
|
lenRead = file4read( &f4memo->file, pos, buf, MEMO4SIZE ) ;
|
||
|
|
if ( lenRead <= 0 )
|
||
|
|
return file4readError( &f4memo->file, pos, MEMO4SIZE, "memo4fileWrite()" ) ;
|
||
|
|
|
||
|
|
for ( i=0 ; ((long) i) < lenRead ; i++ )
|
||
|
|
if ( buf[i] == (char)0x1A ) break ;
|
||
|
|
|
||
|
|
#ifdef E4MISC
|
||
|
|
if ( buf[i] != (char)0x1A && lenRead != MEMO4SIZE )
|
||
|
|
return error4( f4memo->file.codeBase, e4info, E85203 ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
pos += MEMO4SIZE ;
|
||
|
|
} while ( i >= MEMO4SIZE && buf[i] != (char) 0x1A ) ; /* Continue if Esc is not located */
|
||
|
|
|
||
|
|
if ( ((unsigned)readSize) <= ptrLen ) /* there is not room */
|
||
|
|
*memoIdPtr = 0 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( *memoIdPtr == 0 ) /* add entry at eof */
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
lockCond = f4memo->data->memoFile.fileLock ;
|
||
|
|
rc = memo4fileLock( &f4memo->data->memoFile ) ;
|
||
|
|
if ( rc )
|
||
|
|
return rc ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
lenRead = file4read( &f4memo->file, 0, &mh, sizeof( mh ) ) ;
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
#endif
|
||
|
|
if ( error4code( f4memo->data->c4 ) < 0 )
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
return -1 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( lenRead != sizeof( mh ) )
|
||
|
|
{
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
return file4readError( &f4memo->file, 0L, sizeof( mh ), "memo4fileWrite()" ) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
*memoIdPtr = mh.nextBlock ;
|
||
|
|
mh.nextBlock = *memoIdPtr + strNumBlocks ;
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
file4write( &f4memo->file, 0, &mh, sizeof( mh ) ) ;
|
||
|
|
|
||
|
|
#ifndef S4OFF_MULTI
|
||
|
|
#ifndef N4OTHER
|
||
|
|
if ( !lockCond )
|
||
|
|
memo4fileUnlock( &f4memo->data->memoFile ) ;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
mh.nextBlock = x4reverseLong( (void *)&mh.nextBlock ) ;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
if ( memo4fileDump( f4memo, *memoIdPtr, ptr, ptrLen, ptrLen ) < 0 )
|
||
|
|
return -1 ;
|
||
|
|
|
||
|
|
return 0 ;
|
||
|
|
#else
|
||
|
|
/* S4MMDX */
|
||
|
|
memset( (void *)&newEntry, 0, sizeof(newEntry) ) ;
|
||
|
|
newEntry.blockNo = *memoIdPtr ;
|
||
|
|
|
||
|
|
strWritten = 0 ;
|
||
|
|
if ( ptrLen == 0 )
|
||
|
|
{
|
||
|
|
strWritten = 1 ;
|
||
|
|
*memoIdPtr = 0 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Initialize information about the old memo entry */
|
||
|
|
if ( newEntry.blockNo <= 0L )
|
||
|
|
{
|
||
|
|
if ( strWritten )
|
||
|
|
{
|
||
|
|
*memoIdPtr = 0L ;
|
||
|
|
return 0 ;
|
||
|
|
}
|
||
|
|
newEntry.num = 0 ;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pos = newEntry.blockNo * f4memo->blockSize ;
|
||
|
|
|
||
|
|
file4readAll( &f4memo->file, pos, (char *)&oldMemoBlock, sizeof(oldMemoBlock) ) ;
|
||
|
|
#ifdef S4BYTE_SWAP
|
||
|
|
oldMemoBlock.startPos = x4reverseShort( (void *)&oldMemoBlock.startPos ) ;
|
||
|
|
oldMemoBlock.numChars = x4reverseLong( (void *)&oldMemoBlock.numChars ) ;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
newEntry.num = (unsigned)(((long)oldMemoBlock.numChars + (long)f4memo->blockSize-1)/ f4memo->blockSize ) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
strNumBlocks = (int)(((long)ptrLen+2*(sizeof(short))+(sizeof(S4LONG))+ f4memo->blockSize-1) / f4memo->blockSize ) ;
|
||
|
|
|
||
|
|
if ( newEntry.num >= strNumBlocks && !strWritten )
|
||
|
|
{
|
||
|
|
*memoIdPtr = newEntry.blockNo + newEntry.num - strNumBlocks ;
|
||
|
|
if ( memo4fileDump( f4memo, *memoIdPtr, ptr, ptrLen, ptrLen ) < 0 )
|
||
|
|
return -1 ;
|
||
|
|
|
||
|
|
strWritten = 1 ;
|
||
|
|
if ( newEntry.num == strNumBlocks )
|
||
|
|
return 0 ;
|
||
|
|
|
||
|
|
newEntry.num -= strNumBlocks ;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Initialize 'chain' */
|
||
|
|
memset( (void *)&cur, 0, sizeof(cur) ) ;
|
||
|
|
memset( (void *)&prev, 0, sizeof(prev) ) ;
|
||
|
|
|
||
|
|
for(;;)
|
||
|
|
{
|
||
|
|
if ( error4code( f4memo->data->c4 ) < 0 )
|
||
|
|
return -1 ;
|
||
|
|
|
||
|
|
memo4fileChainFlush( f4memo, &prev ) ;
|
||
|
|
prevPrevEntry = prev.blockNo ;
|
||
|
|
prevPrevNum = prev.num ;
|
||
|
|
|
||
|
|
memcpy( (void *)&prev, (void *)&cur, sizeof(prev) ) ;
|
||
|
|
|
||
|
|
if ( newEntry.blockNo > 0 && prev.next > newEntry.blockNo )
|
||
|
|
{
|
||
|
|
/* See if the new entry fits in here */
|
||
|
|
memcpy( (void *)&cur, (void *)&newEntry, sizeof(cur) ) ;
|
||
|
|
newEntry.blockNo = 0 ;
|
||
|
|
cur.next = prev.next ;
|
||
|
|
prev.next = cur.blockNo ;
|
||
|
|
cur.toDisk = prev.toDisk = 1 ;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
memo4fileChainSkip( f4memo, &cur ) ;
|
||
|
|
|
||
|
|
/* See if the entries can be combined. */
|
||
|
|
if ( prev.blockNo + prev.num == cur.blockNo && prev.num )
|
||
|
|
{
|
||
|
|
/* 'cur' becomes the combined groups. */
|
||
|
|
prev.toDisk = 0 ;
|
||
|
|
cur.toDisk = 1 ;
|
||
|
|
|
||
|
|
cur.blockNo = prev.blockNo ;
|
||
|
|
if ( cur.num >= 0 )
|
||
|
|
cur.num += prev.num ;
|
||
|
|
prev.blockNo = prevPrevEntry ;
|
||
|
|
prev.num = prevPrevNum ;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( strWritten )
|
||
|
|
{
|
||
|
|
if ( newEntry.blockNo == 0 )
|
||
|
|
{
|
||
|
|
memo4fileChainFlush( f4memo, &prev ) ;
|
||
|
|
memo4fileChainFlush( f4memo, &cur ) ;
|
||
|
|
return 0 ;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else /* 'str' is not yet written, try the current entry */
|
||
|
|
{
|
||
|
|
if ( cur.next == -1 ) /* End of file */
|
||
|
|
cur.num = strNumBlocks ;
|
||
|
|
|
||
|
|
if ( cur.num >= strNumBlocks )
|
||
|
|
{
|
||
|
|
cur.num -= strNumBlocks ;
|
||
|
|
*memoIdPtr = cur.blockNo + cur.num ;
|
||
|
|
memo4fileDump( f4memo, *memoIdPtr, ptr, ptrLen, ptrLen ) ;
|
||
|
|
if ( cur.next == -1 ) /* if end of file */
|
||
|
|
{
|
||
|
|
/* For dBASE IV compatibility */
|
||
|
|
fileLen = file4len( &f4memo->file ) ;
|
||
|
|
extraLen = f4memo->blockSize - fileLen % f4memo->blockSize ;
|
||
|
|
if ( extraLen != f4memo->blockSize )
|
||
|
|
file4lenSet( &f4memo->file, fileLen+extraLen ) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
strWritten = 1 ;
|
||
|
|
|
||
|
|
if ( cur.num == 0 )
|
||
|
|
{
|
||
|
|
if ( cur.next == -1 ) /* End of file */
|
||
|
|
prev.next = cur.blockNo + strNumBlocks ;
|
||
|
|
else
|
||
|
|
prev.next = cur.next ;
|
||
|
|
prev.toDisk = 1 ;
|
||
|
|
cur.toDisk = 0 ;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
cur.toDisk = 1 ;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
#endif /* S4OFF_WRITE */
|
||
|
|
#endif /* S4MEMO_OFF */
|
||
|
|
|
||
|
|
#endif /* S4CLIENT */
|