288 lines
7.3 KiB
C
288 lines
7.3 KiB
C
/***************************************************************************
|
|
* Copyright 1995, Technion, Israel Institute of Technology
|
|
* Electrical Eng, Software Lab.
|
|
* Author: Michael Veksler.
|
|
***************************************************************************
|
|
* File: dde_atom.c
|
|
* Purpose : atom functionality for DDE
|
|
*/
|
|
#ifdef CONFIG_IPC
|
|
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "dde_atom.h"
|
|
#include "shm_main_blk.h"
|
|
#include "shm_fragment.h"
|
|
#include "ldt.h"
|
|
#include "debug.h"
|
|
|
|
DEFAULT_DEBUG_CHANNEL(atom)
|
|
|
|
typedef struct
|
|
{
|
|
WORD count;
|
|
BYTE str[1];
|
|
} AtomData, *AtomData_ptr;
|
|
|
|
#define EMPTY 0 /* empty hash entry */
|
|
#define DELETED -1 /* deleted hash entry */
|
|
#define MIN_STR_ATOM 0xfc00
|
|
|
|
/* OFS2AtomData_ptr: extract AtomData_ptr from ofs */
|
|
#define OFS2AtomData_ptr(ofs) ((AtomData*)((int)&main_block->block+(ofs)))
|
|
|
|
/* OFS2AtomStr: find the string of the atom */
|
|
#define OFS2AtomStr(ofs) (OFS2AtomData_ptr(atom_ofs)->str)
|
|
|
|
/* offset of an atom according to index */
|
|
#define ATOM_OFS(idx) (main_block->atoms[idx])
|
|
|
|
/* rot_left: rotate (with wrap-around) */
|
|
static __inline__ int rot_left(unsigned var,int count)
|
|
{
|
|
return (var<<count) | (var>> (sizeof(var)-count));
|
|
}
|
|
/* find the entry in the atom table for this string */
|
|
static int FindHash(LPCSTR str) /* ignore str case */
|
|
{
|
|
int i,j;
|
|
unsigned hash1,hash2;
|
|
int deleted=-1; /* hash for deleted entry */
|
|
int atom_ofs;
|
|
|
|
/* get basic hash parameters */
|
|
for (i= hash1= hash2= 0; str[i] ; i++) {
|
|
hash1= rot_left(hash1,5) ^ toupper(str[i]);
|
|
hash2= rot_left(hash2,4) ^ toupper(str[i]);
|
|
}
|
|
|
|
hash1%= DDE_ATOMS;
|
|
atom_ofs=ATOM_OFS(hash1);
|
|
switch (atom_ofs) {
|
|
case EMPTY: /* empty atom entry */
|
|
return hash1;
|
|
case DELETED: /* deleted atom entry */
|
|
deleted=hash1;
|
|
break;
|
|
default : /* non empty atom entry */
|
|
if (lstrcmpi16( OFS2AtomStr(atom_ofs) , str) == 0)
|
|
return hash1; /* found string in atom table */
|
|
}
|
|
hash2%= DDE_ATOMS-1 ; /* hash2=0..(DDE_ATOMS-2) */
|
|
hash2++; /* hash2=1..(DDE_ATOMS-1) */
|
|
|
|
/* make jumps in the hash table by hash2 steps */
|
|
for (i=hash1+hash2 ; ; i+=hash2) {
|
|
/* i wraps around into j */
|
|
j=i-DDE_ATOMS;
|
|
if (j >= 0)
|
|
i=j; /* i wraps around */
|
|
|
|
if (i==hash1)
|
|
/* here if covered all hash locations, and got back to beginning */
|
|
return deleted; /* return first empty entry - if any */
|
|
atom_ofs=ATOM_OFS(i);
|
|
switch (atom_ofs) {
|
|
case EMPTY: /* empty atom entry */
|
|
return i;
|
|
case DELETED: /* deleted atom entry */
|
|
if (deleted < 0)
|
|
/* consider only the first deleted entry */
|
|
deleted= i;
|
|
break;
|
|
default : /* nonempty atom entry */
|
|
if (lstrcmpi16( OFS2AtomStr(atom_ofs) , str) == 0)
|
|
return i; /* found string in atom table */
|
|
}
|
|
}
|
|
}
|
|
|
|
void ATOM_GlobalInit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i=0 ; i < DDE_ATOMS ; i++)
|
|
ATOM_OFS(i)=EMPTY;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DDE_GlobalAddAtom
|
|
*/
|
|
|
|
/* important! don't forget to unlock semaphores before return */
|
|
ATOM DDE_GlobalAddAtom( SEGPTR name )
|
|
{
|
|
int atom_idx;
|
|
int atom_ofs;
|
|
AtomData_ptr ptr;
|
|
ATOM atom;
|
|
char *str;
|
|
|
|
/* First check for integer atom */
|
|
|
|
if (!HIWORD(name)) return (ATOM)LOWORD(name);
|
|
|
|
str = (char *)PTR_SEG_TO_LIN( name );
|
|
if (str[0] == '#')
|
|
{
|
|
ATOM atom= (ATOM) atoi(&str[1]);
|
|
return (atom<MIN_STR_ATOM) ? atom : 0;
|
|
}
|
|
|
|
TRACE(atom,"(\"%s\")\n",str);
|
|
|
|
DDE_IPC_init(); /* will initialize only if needed */
|
|
|
|
shm_write_wait(main_block->sem);
|
|
|
|
atom_idx=FindHash(str);
|
|
atom=(ATOM)0;
|
|
|
|
/* use "return" only at the end so semaphore handling is done only once */
|
|
if (atom_idx>=0) {
|
|
/* unless table full and item not found */
|
|
switch (atom_ofs= ATOM_OFS(atom_idx)) {
|
|
case DELETED:
|
|
case EMPTY: /* need to allocate new atom */
|
|
atom_ofs= shm_FragmentAlloc(&main_block->block,
|
|
strlen(str)+sizeof(AtomData));
|
|
if (atom_ofs==NIL)
|
|
break; /* no more memory (atom==0) */
|
|
ATOM_OFS(atom_idx)=atom_ofs;
|
|
ptr=OFS2AtomData_ptr(atom_ofs);
|
|
strcpy(ptr->str,str);
|
|
ptr->count=1;
|
|
atom=(ATOM)(atom_idx+MIN_STR_ATOM);
|
|
break;
|
|
default : /* has to update existing atom */
|
|
OFS2AtomData_ptr(atom_ofs)->count++;
|
|
atom=(ATOM)(atom_idx+MIN_STR_ATOM);
|
|
} /* end of switch */
|
|
} /* end of if */
|
|
shm_write_signal(main_block->sem);
|
|
return atom;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DDE_GlobalDeleteAtom
|
|
*/
|
|
|
|
ATOM DDE_GlobalDeleteAtom( ATOM atom )
|
|
{
|
|
int atom_idx;
|
|
int atom_ofs;
|
|
AtomData_ptr atom_ptr;
|
|
ATOM retval=(ATOM) 0;
|
|
|
|
TRACE(atom,"(\"%d\")\n",(int)atom);
|
|
atom_idx=(int)atom - MIN_STR_ATOM;
|
|
|
|
if (atom_idx < 0 )
|
|
return 0;
|
|
|
|
DDE_IPC_init(); /* will initialize only if needed */
|
|
|
|
shm_write_wait(main_block->sem);
|
|
/* return used only once from here on -- for semaphore simplicity */
|
|
switch (atom_ofs=ATOM_OFS(atom_idx)) {
|
|
case DELETED:
|
|
case EMPTY:
|
|
WARN(atom, "Trying to free unallocated atom %d\n", atom);
|
|
retval=atom;
|
|
break;
|
|
default :
|
|
atom_ptr=OFS2AtomData_ptr(atom_ofs);
|
|
if ( --atom_ptr->count == 0) {
|
|
shm_FragmentFree(&main_block->block,atom_ofs);
|
|
ATOM_OFS(atom_idx)=DELETED;
|
|
}
|
|
}
|
|
|
|
shm_write_signal(main_block->sem);
|
|
return retval;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DDE_GlobalFindAtom
|
|
*/
|
|
ATOM DDE_GlobalFindAtom( SEGPTR name )
|
|
{
|
|
int atom_idx;
|
|
int atom_ofs;
|
|
char *str;
|
|
|
|
TRACE(atom,"(%08lx)\n", name );
|
|
|
|
/* First check for integer atom */
|
|
|
|
if (!HIWORD(name)) return (ATOM)LOWORD(name);
|
|
|
|
str = (char *)PTR_SEG_TO_LIN( name );
|
|
if (str[0] == '#')
|
|
{
|
|
ATOM atom= (ATOM) atoi(&str[1]);
|
|
return (atom<MIN_STR_ATOM) ? atom : 0;
|
|
}
|
|
TRACE(atom,"(\"%s\")\n",str);
|
|
|
|
DDE_IPC_init(); /* will initialize only if needed */
|
|
|
|
shm_read_wait(main_block->sem);
|
|
atom_idx=FindHash(str);
|
|
if (atom_idx>=0)
|
|
atom_ofs=ATOM_OFS(atom_idx); /* is it free ? */
|
|
else
|
|
atom_ofs=EMPTY;
|
|
shm_read_signal(main_block->sem);
|
|
|
|
if (atom_ofs==EMPTY || atom_ofs==DELETED)
|
|
return 0;
|
|
else
|
|
return (ATOM)(atom_idx+MIN_STR_ATOM);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DDE_GlobalGetAtomName
|
|
*/
|
|
WORD DDE_GlobalGetAtomName( ATOM atom, LPSTR buffer, short count )
|
|
{
|
|
int atom_idx, atom_ofs;
|
|
int size;
|
|
/* temporary buffer to hold maximum "#65535\0" */
|
|
char str_num[7];
|
|
|
|
if (count<2) /* no sense to go on */
|
|
return 0;
|
|
atom_idx=(int)atom - MIN_STR_ATOM;
|
|
|
|
if (atom_idx < 0) { /* word atom */
|
|
/* use wine convention... */
|
|
sprintf(str_num,"#%d%n",(int)atom,&size);
|
|
if (size+1>count) { /* overflow ? */
|
|
/* truncate the string */
|
|
size=count-1;
|
|
str_num[size]='\0';
|
|
}
|
|
strcpy(buffer,str_num);
|
|
return size;
|
|
}
|
|
|
|
DDE_IPC_init(); /* will initialize only if needed */
|
|
|
|
/* string atom */
|
|
shm_read_wait(main_block->sem);
|
|
atom_ofs=ATOM_OFS(atom_idx);
|
|
if (atom_ofs==EMPTY || atom_ofs==DELETED) {
|
|
WARN(atom,"Illegal atom=%d\n",(int)atom);
|
|
size=0;
|
|
} else { /* non empty entry */
|
|
/* string length will be at most count-1, find actual size */
|
|
sprintf(buffer,"%.*s%n",count-1, OFS2AtomStr(atom_ofs), &size);
|
|
}
|
|
shm_read_signal(main_block->sem);
|
|
return size;
|
|
}
|
|
|
|
#endif /* CONFIG_IPC */
|