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/*
* pswdict.c
*
* (c) Copyright 1988-1994 Adobe Systems Incorporated.
* All rights reserved.
*
* Permission to use, copy, modify, distribute, and sublicense this software
* and its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notices appear in all copies and that
* both those copyright notices and this permission notice appear in
* supporting documentation and that the name of Adobe Systems Incorporated
* not be used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. No trademark license
* to use the Adobe trademarks is hereby granted. If the Adobe trademark
* "Display PostScript"(tm) is used to describe this software, its
* functionality or for any other purpose, such use shall be limited to a
* statement that this software works in conjunction with the Display
* PostScript system. Proper trademark attribution to reflect Adobe's
* ownership of the trademark shall be given whenever any such reference to
* the Display PostScript system is made.
*
* ADOBE MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF THE SOFTWARE FOR
* ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
* ADOBE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON- INFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL ADOBE BE LIABLE
* TO YOU OR ANY OTHER PARTY FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE, STRICT LIABILITY OR ANY OTHER ACTION ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ADOBE WILL NOT
* PROVIDE ANY TRAINING OR OTHER SUPPORT FOR THE SOFTWARE.
*
* Adobe, PostScript, and Display PostScript are trademarks of Adobe Systems
* Incorporated which may be registered in certain jurisdictions
*
* Author: Adobe Systems Incorporated
*/
/***********/
/* Imports */
/***********/
#include <stdlib.h>
#include "pswtypes.h"
#include "pswdict.h"
#include "psw.h"
#ifdef XENVIRONMENT
#include <X11/Xos.h>
#else
#include <string.h>
#endif
/********************/
/* Types */
/********************/
typedef struct _t_EntryRec {
struct _t_EntryRec *next;
char *name;
PSWDictValue value;
} EntryRec, *Entry;
/* The concrete definition for a dictionary */
typedef struct _t_PSWDictRec {
int nEntries;
Entry *entries;
} PSWDictRec;
PSWDict atoms;
/**************************/
/* Procedure Declarations */
/**************************/
/* Creates and returns a new dictionary. nEntries is a hint. */
PSWDict CreatePSWDict(int nEntries)
{
PSWDict d = (PSWDict)psw_calloc(sizeof(PSWDictRec), 1);
d->nEntries = nEntries;
d->entries = (Entry *)psw_calloc(sizeof(EntryRec), d->nEntries);
return d;
}
/* Destroys a dictionary */
void DestroyPSWDict(PSWDict dict)
{
free(dict->entries);
free(dict);
}
static int Hash(char *name, int nEntries)
{
register int val = 0;
while (*name) val += *name++;
if (val < 0) val = -val;
return (val % nEntries);
}
static Entry Probe(PSWDict d, int x, char *name)
{
register Entry e;
for (e = (d->entries)[x]; e; e = e->next) {
if (strcmp(name, e->name) == 0) break;
}
return e;
}
static Entry PrevProbe(Entry *prev, PSWDict d, int x, char *name)
{
register Entry e;
*prev = NULL;
for (e = (d->entries)[x]; e; e = e->next) {
if (strcmp(name, e->name) == 0) break;
*prev = e;
}
return e;
}
/* -1 => not found */
PSWDictValue PSWDictLookup(PSWDict dict, char *name)
{
Entry e;
e = Probe(dict, Hash(name, dict->nEntries), name);
if (e == NULL) return -1;
return e->value;
}
/* 0 => normal return (not found)
-1 => found. If found, value is replaced. */
PSWDictValue PSWDictEnter(PSWDict dict, char *name, PSWDictValue value)
{
Entry e;
int x = Hash(name, dict->nEntries);
e = Probe(dict, x, name);
if (e) {
e->value = value;
return -1;
}
e = (Entry)psw_calloc(sizeof(EntryRec), 1);
e->next = (dict->entries)[x]; (dict->entries)[x] = e;
e->value = value;
e->name = MakeAtom(name);
return 0;
}
/* -1 => not found. If found, value is returned. */
PSWDictValue PSWDictRemove(PSWDict dict, char *name)
{
Entry e, prev;
PSWDictValue value;
int x = Hash(name, dict->nEntries);
e = PrevProbe(&prev, dict, x, name);
if (e == NULL) return -1;
value = e->value;
if (prev == NULL) (dict->entries)[x] = e->next; else prev->next = e->next;
free(e);
return value;
}
PSWAtom MakeAtom(char *name)
{
Entry e;
int x = Hash(name, 511);
char *newname;
if (atoms == NULL) atoms = CreatePSWDict(511);
e = Probe(atoms, x, name);
if (e == NULL) {
e = (Entry)psw_calloc(sizeof(EntryRec), 1);
e->next = (atoms->entries)[x]; (atoms->entries)[x] = e;
e->value = 0;
newname = psw_malloc(strlen(name)+1);
strcpy(newname, name);
e->name = newname;
}
return e->name;
}
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