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keytables.c
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C/C++ Source or Header
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1993-03-25
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/******************************************************************************
MODUL
keytables.c
DESCRIPTION
Management for Key-Hashing tables
NOTES
original from M.Dillon
for the first(!) call of any function of that module,
the corresponding HASH-table must be clean (setmem(...,0))
BUGS
thousands - but where
there may be some inconsistencies
TODO
new method for management of hashes
resolve the references to av[]
EXAMPLES
SEE ALSO
keycodes.c keycom.c keycontrol.c
INDEX
HISTORY
14-Dec-92 b_null created
15-Dez-92 b_null modified
15-Dez-92 b_null docs updated, some checks added
16-Dez-92 b_null documented
******************************************************************************/
/**************************************
Includes
**************************************/
#include "defs.h"
#include <devices/keymap.h>
#include <devices/console.h>
#include "keyhashes.h"
/**************************************
Globale Variable
**************************************/
Prototype void keyload (KEYTABLE * kt, char * name);
Prototype void keysave (KEYTABLE * kt, char * name);
Prototype int loadkeys (KEYTABLE * kt, FILE * fi, int * lineno);
Prototype int savekeys (KEYTABLE * kt, FILE * fo);
Prototype HASH * findhash (KEYTABLE * kt, UBYTE code, USHORT qual);
Prototype APTR keyspec2macro (KEYTABLE * kt, char * str);
Prototype int resethash (KEYTABLE * kt);
Prototype int unmapkey (KEYTABLE * kt, char * key);
Prototype int mapkey (KEYTABLE * kt, char * key, char * value);
Prototype int remhash (KEYTABLE * kt, UBYTE code, USHORT mask, USHORT qual);
Prototype int addhash (KEYTABLE * kt, UBYTE code, USHORT mask, USHORT qual, const UBYTE * comm, const UBYTE * help);
Prototype void dealloc_hash (KEYTABLE * kt);
Prototype KEYTABLE * get_keytable (char * name);
Prototype KEYTABLE * new_keytable (char * name, int defaults);
Prototype void delete_keytable (KEYTABLE * kt, int force);
Prototype void exit_keytables (void);
/**************************************
Interne Defines & Strukturen
**************************************/
#define HASHMASK (HASHSIZE-1)
#define QUALMASK 0x3ff
/**************************************
Interne Variable
**************************************/
/* extern TWOSTRINGS defmap[]; */
#include "defmap.h"
/* this is the list of all keytables */
static struct MinList KeyTables = { &KeyTables.mlh_Tail, NULL, &KeyTables.mlh_Head };
/**************************************
Interne Prototypes
**************************************/
/*****************************************************************************
NAME
freehash
PARAMETER
HASH * hash
RESULT
the hash->next entry if existing
NULL if hash == NULL
RETURN
HASH *
DESCRIPTION
free a hash-entry and all associated data
NOTES
the free'd hash must not be entry in a hashtable,
as we do not take care of any refernces, but only
of hash, comm and help
BUGS
EXAMPLES
SEE ALSO
INTERNALS
HISTORY
23 Jan 1993 b_null created
******************************************************************************/
HASH * freehash (HASH * hash)
{
HASH * next = NULL;
if (hash) {
next = hash->next;
if (hash->comm) {
DeallocFunc (hash->comm);
} /* if */
if (hash->help) {
DeallocFunc (hash->help);
} /* if */
FreeFunc(hash, sizeof(HASH));
} /* if */
return (next);
} /* freehash */
/*****************************************************************************
NAME
addhash
PARAMETER
KEYTABLE * kt
UBYTE code
USHORT mask
USHORT qual
char * comm
char * help
RESULT
success: RET_SUCC == ok; RET_FAIL == failure
RETURN
int
DESCRIPTION
create a new hash-entry for a known hash
if there is already an existing one with the same code/qual
simply change its command
NOTES
that function is called by mapkey
BUGS
WARNING : WE DO NOT LOOK FOR A SETTING OF help YET !!!
EXAMPLES
SEE ALSO
INTERNALS
finde den hash-slot
falls der eintrag schon existiert, ersetze den comm
sonst erstelle einen neuen eintrag
falls nicht alles funktionierte, stelle den alten zustand wieder her
HISTORY
14-Dec-92 b_null included & modified
16-Dec-92 b_null added handling of "nolink"
******************************************************************************/
int addhash (KEYTABLE * kt, UBYTE code, USHORT mask, USHORT qual, const UBYTE * comm, const UBYTE * help)
{
HASH ** p,
* hash;
APTR oldcomm = NULL;
if (kt == NULL) {
return (RET_FAIL);
} /* if empty or missing table */
hash = *(p = &kt->hash[code&HASHMASK]);
while (hash) {
if (hash->code == code && hash->qual == qual && hash->mask == mask) {
goto newstr;
} /* if found old */
hash = *(p = &hash->next);
} /* while entries left */
hash = (HASH *)AllocFunc (sizeof (HASH), MEMF_ANY);
clrmem (hash, sizeof (HASH));
if (hash == NULL) {
globalflags.Abortcommand = 1;
return (RET_FAIL);
} /* if nomemory */
hash->next = NULL;
hash->code = code;
hash->mask = mask;
hash->qual = qual;
newstr:
/* oldcomm = hash->comm; */
DeallocFunc (hash->comm);
DeallocFunc (hash->help);
hash->comm = DupFunc (comm, 0);
hash->help = DupFunc (help, 0);
if ((!hash->comm) /* || (!hash->help) */ /* || (oldcomm == hash->comm) */) {
*p = freehash (hash);
return (RET_FAIL);
} /* if something went wrong */
/* everything worked fine - insert it into the table */
*p = hash;
return (RET_SUCC);
} /* addhash */
/*****************************************************************************
NAME
remhash
PARAMETER
KEYTABLE * kt
UBYTE code
USHORT mask
USHORT qual
RESULT
success:
RET_SUCC == ok;
RET_FAIL == failure or not found
RETURN
int
DESCRIPTION
delete an existing hashentry
NOTES
that function is called by unmapkey
BUGS
EXAMPLES
SEE ALSO
INTERNALS
finde den hash-slot
falls der eintrag existiert, loesche ihn und seinen link
sonst mache gar nichts
HISTORY
14-Dec-92 b_null included & modified
23-Jan-93 b_null used freehash
******************************************************************************/
int remhash (KEYTABLE * kt, UBYTE code, USHORT mask, USHORT qual)
{
HASH * hash, /* current */
** p; /* previous */
if (kt == NULL) {
return (RET_FAIL);
} /* if empty or missing table */
hash = *(p = &kt->hash[code&HASHMASK]);
while (hash) {
if (hash->code == code && hash->qual == qual && hash->mask == mask) {
*p = freehash (hash);
return (RET_SUCC);
} /* if found */
hash = *(p = &hash->next);
} /* while searching */
/* not found: */
return (RET_FAIL);
} /* remhash */
/*****************************************************************************
NAME
mapkey
PARAMETER
KEYTABLE * kt
char * key
char * value
RESULT
success:
RET_FAIL == error
RET_OK == everything ok
RETURN
int
DESCRIPTION
first abstraction for addhash
which uses an ascii-name
NOTES
this function might call error()
BUGS
EXAMPLES
SEE ALSO
addhash, unmapkey
INTERNALS
falls es sich um einen gueltigen map handelt
belege ihn (neu)
sonst gebe eine fehlermeldung aus
HISTORY
14-Dec-92 b_null included & modified
23-Jan-93 b_null void -> int
******************************************************************************/
int mapkey (KEYTABLE * kt, char * key, char * value)
/* char * help */
{
UBYTE code;
USHORT qual;
if (get_codequal (key, &code, &qual)) {
return (addhash (kt, code, QUALMASK, qual, value, NULL)); /* help)); */
} else {
error ("%s:\nUnknown Key '%s'", CommandName(), key);
}
return (RET_FAIL);
} /* mapkey */
/*****************************************************************************
NAME
unmapkey
PARAMETER
KEYTABLE * kt
char * key
RESULT
success:
RET_FAIL == error
RET_OK == everything ok
RETURN
int
DESCRIPTION
first abstraction for remhash
which uses an ascii-name
NOTES
this function might call error()
BUGS
EXAMPLES
SEE ALSO
remhash, mapkey
INTERNALS
falls es sich um einen gueltigen map handelt
loesche seine belegung
sonst gebe eine fehlermeldung aus
HISTORY
14-Dec-92 b_null included & modified
23-Jan-93 b_null void -> int
******************************************************************************/
int unmapkey (KEYTABLE * kt, char * key)
{
UBYTE code;
USHORT qual;
if (get_codequal(key, &code, &qual)) {
return (remhash (kt, code, QUALMASK, qual));
} else {
error ("%s:\nUnknown Key '%s'", CommandName(), key);
}
return (RET_FAIL);
} /* unmapkey */
/*****************************************************************************
NAME
dealloc_hash
PARAMETER
KEYTABLE * kt
RESULT
-/-
RETURN
void
DESCRIPTION
frees all Hash-entries in a key-table
NOTES
BUGS
EXAMPLES
SEE ALSO
INTERNALS
ueber allen hash-slots
loesche jeden eintrag des hash-slots
HISTORY
14-Dec-92 b_null included & modified
******************************************************************************/
void dealloc_hash ( KEYTABLE * kt )
{
HASH * hash,
* hnext = NULL; /* save ptr to the next entry when freeing the current */
short i;
if (kt == NULL) {
return ();
} /* if empty or missing table */
for (i = 0; i < HASHSIZE; i++) {
for (hash = kt->hash[i]; hash; hash = hnext) {
hnext = freehash (hash);
} /* for */
kt->hash[i] = NULL;
} /* for */
} /* dealloc_hash */
/*****************************************************************************
NAME
resethash
PARAMETER
KEYTABLE * kt
RESULT
success:
RET_FAIL == error (might have worked partially)
RET_OK == everything ok
RETURN
int
DESCRIPTION
dealloc all entries of a hashtable and then
set its contents to default-values
NOTES
the defaults are stored in an array
called defmap
BUGS
EXAMPLES
SEE ALSO
mapkey, dealloc_hash
INTERNALS
loesche die tabelle
solange noch ein gueltiger eintrag in defmap ist (und alles gutging)
erzeuge eine map fuer ihn
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null documented
******************************************************************************/
int resethash (KEYTABLE * kt)
{
short i;
if (kt == NULL) {
return (RET_FAIL);
} /* if empty or missing table */
dealloc_hash (kt);
for (i = 0; defmap[i].from; ++i) {
if (!mapkey (kt, defmap[i].from, defmap[i].to)) { /* ,defmap[i].help)) */
return (RET_FAIL);
} /* if error */
} /* for defmap-entries */
return (RET_SUCC);
} /* resethash */
/*****************************************************************************
NAME
findhash
PARAMETER
KEYTABLE * kt
UBYTE code
USHORT qual
RESULT
the hash-entry associated with code and qual
RETURN
HASH *
DESCRIPTION
simple searching
NOTES
this routine is part of keyspec2macro
BUGS
EXAMPLES
SEE ALSO
keyspec2macro
INTERNALS
finde den richtigen slot
solange es noch eintraege in dem slot gibe, und der richtige nicht
gefunden ist,
gehe zum naechsten eintrag
wenn du was gefunden hast, gib es aus, sonst NULL
HISTORY
16-Dec-92 b_null created
******************************************************************************/
HASH * findhash (KEYTABLE * kt, UBYTE code, USHORT qual)
{
HASH * hash;
if (kt == NULL) {
return (NULL);
} /* if empty or missing table */
for (hash = kt->hash[code&HASHMASK]; hash; hash = hash->next) {
if (hash->code == code) {
if (hash->qual == (qual & hash->mask)) {
return (hash);
}
}
}
return (NULL);
} /* findhash */
/*****************************************************************************
NAME
keyspectohash
PARAMETER
KEYTABLE * kt
char * str
RESULT
the Hashentry associated with
the name str
RETURN
HASH *
DESCRIPTION
transform str into a Hash-value and search for its entry
NOTES
this routine uses findhash
BUGS
EXAMPLES
SEE ALSO
findhash
INTERNALS
falls es sich um einen gueltigen schluessel handelt,
finde eine passenden eintrag und
gib ihn aus
sonst gib NULL aus
HISTORY
23-Jan-93 b_null created
******************************************************************************/
HASH * keyspectohash (KEYTABLE * kt, char * str)
{
UBYTE code;
USHORT qual;
if (get_codequal(str, &code, &qual)) {
return (findhash (kt, code, qual));
} /* if is key */
return (NULL);
} /* keyspectohash */
/*****************************************************************************
NAME
keyspec2macro
PARAMETER
KEYTABLE * kt
char * str
RESULT
the macro-field of the Hashentry associated with
the name str
RETURN
APTR
DESCRIPTION
transform str into a Hash-value and search for its entry
then return its command-entry
NOTES
this routine is splitted into
two minor ones by putting the searching
into another routine called findhash&keyspectohash
BUGS
EXAMPLES
SEE ALSO
findhash
INTERNALS
finde den passendedn eintrag
und gib dessen comm aus
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null splitted & documented
******************************************************************************/
APTR keyspec2macro (KEYTABLE * kt, char * str)
{
HASH *hash;
hash = keyspectohash (kt, str);
if (hash) {
return (hash->comm);
} /* if */
return (NULL);
} /* keyspec2macro */
/*****************************************************************************
NAME
savekeys
PARAMETER
KEYTABLE * kt
FILE * fi
RESULT
success:
RET_FAIL == error
RET_OK == everything ok
RETURN
int
DESCRIPTION
write a special keymap file
or the keymap section of a file
such a section can be read with loadkeys
NOTES
currently the keymap-section is in ascii
format - this may be changed to IFF
this function is separated from keysave for use in packages
BUGS
EXAMPLES
SEE ALSO
loadkeys
INTERNALS
schreibe einen header
gehe alle slots entlang und
schreibe alle eintraege der slots
schreibe einen footer
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null documented
******************************************************************************/
int savekeys (KEYTABLE * kt, FILE * fo)
{
HASH * hash;
int i;
if (kt == NULL) {
return (RET_FAIL);
} /* if empty or missing table */
fprintf(fo, "KEYLIST START\n");
for (i = 0; i < HASHSIZE; i++) {
for (hash = kt->hash[i]; hash; hash = hash->next) {
fprintf (fo, "\tKEY %s\n", cqtoa (hash->code, hash->qual));
/* --- THAT BLOCK MUST BE CHANGED IF MACROS ARE MODIFIED */
/* fprintf (fo, "\t HELP %s\n", hash->help); */
fprintf (fo, "\t COM %s\n", hash->comm);
/* --- THAT BLOCK MUST BE CHANGED IF MACROS ARE MODIFIED */
} /* for keys */
} /* for hashes */
fprintf(fo, "KEYLIST END\n");
return (RET_SUCC);
} /* savekeys */
/*****************************************************************************
NAME
loadkeys
PARAMETER
KEYTABLE * kt
FILE * fi
int * lineno
RESULT
success:
RET_FAIL == error
RET_OK == everything ok
RETURN
int
DESCRIPTION
read a special Keymap-File
or the Keymap-section of a file
which was created with savekeys
NOTES
this function might call error()
this function is separated from keyload for use in packages
can not support "help" yet
BUGS
EXAMPLES
SEE ALSO
savekeys
INTERNALS
lese den header
solange alles gutging und der footer nicht erreicht wurde
lese nacheinander schluessel
und macro
falls eine Zeile nicht in diese Sequenz passt ABBRUCH
das muss geaendert werden:
lese den header
solange alles gutging und der footer nicht erreicht wurde
lese schluessel und
danach macro (und evtl help)
da die reihenfolge von macro und help variieren kann,
darf der naechste addhash erst durchgefuehrt werden beim naechsten KEY oder bei KEYLIST END
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null documented
******************************************************************************/
#define next_nonblank(buf) {while (*buf && *buf<33) buf++; }
int loadkeys (KEYTABLE * kt, FILE * fi, int * lineno)
{
char * buf;
char nkey [128];
char help [128];
char body [LINE_LENGTH];
if (kt == NULL) {
return (RET_FAIL);
} /* if empty or missing table */
buf = getnextcomline (fi, lineno);
if (!buf) {
globalflags.Abortcommand = 1;
return (RET_FAIL);
} /* if */
if (strncmp(buf, "KEYLIST START", 13) != 0) {
error ("No Keystart header");
return (RET_FAIL);
} /* if */
nkey [0] = 0;
help [0] = 0;
body [0] = 0;
while (globalflags.Abortcommand == 0) {
buf = getnextcomline(fi, lineno);
/* printf("read %s\n", buf); */
if (!buf) {
globalflags.Abortcommand = 1;
return (RET_FAIL);
} /* if */
if (strncmp(buf, "KEYLIST END", 11) == 0) {
return (RET_SUCC);
} else if (strncmp(buf, "KEY ", 4) == 0) {
buf += 3;
next_nonblank(buf);
if (nkey[0] != 0) {
error ("<%s:\nDeclared Key w/out Body '%s'", CommandName(), buf);
return (RET_FAIL);
} /* if */
strncpy(nkey, buf, 128);
#ifdef NOT_DEF
} else if (strncmp(buf, "HELP", 4) == 0) {
buf += 4;
next_nonblank(buf);
if (nkey[0] == 0) {
error ("<%s:\nDeclared Help w/out a Key", CommandName(), buf);
return (RET_FAIL);
} /* if */
strncpy(help, buf, 128);
#endif
} else if (strncmp (buf, "COM", 3) == 0) {
buf += 3;
next_nonblank(buf);
if (nkey[0] == 0) {
error ("<%s:\nDeclared Body w/out a Key", CommandName());
return (RET_FAIL);
} /* if */
strncpy (body, buf, LINE_LENGTH);
mapkey (kt, nkey, body); /* ,help */
help[0] = 0;
nkey[0] = 0;
} else {
error ("%s:\nunknown identifier '%s'", CommandName(), buf);
return (RET_FAIL);
} /* if types */
} /* while not ready */
return (RET_FAIL);
} /* loadkeys */
/*****************************************************************************
NAME
keysave
PARAMETER
KEYTABLE * kt
char * name
RESULT
-/-
RETURN
void
DESCRIPTION
first abstraction of savekeys to single files:
handling of open&close
NOTES
BUGS
EXAMPLES
SEE ALSO
savekeys
INTERNALS
oeffne ein file
falls das ging,
lese die enthaltenen mappings
und schliesse es
sonst gib einen Fehler aus
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null renamed & documented
******************************************************************************/
void keysave (KEYTABLE * kt, char * name)
{
FILE * fo = NULL;
if (fo = fopen (name, "w")) {
savekeys (kt, fo);
fclose (fo);
} else {
error ("%s:\nCan't open file %s for output", CommandName(), name);
} /* if */
} /* keysave */
/*****************************************************************************
NAME
keyload
PARAMETER
KEYTABLE * kt
char * name
RESULT
-/-
RETURN
void
DESCRIPTION
first abstraction of loadkeys to single files:
handling of open & close
NOTES
BUGS
EXAMPLES
SEE ALSO
loadkeys
INTERNALS
oeffne ein file
falls das ging,
schreibe die aktuellen mappings hinein
und schliesse es
sonst gib einen Fehler aus
HISTORY
14-Dec-92 b_null included
16-Dec-92 b_null renamed & documented
******************************************************************************/
void keyload (KEYTABLE * kt, char * name)
{
FILE * fi = NULL;
int lineno = 0;
if (fi = fopen (name, "r")) {
dealloc_hash (kt);
loadkeys (kt, fi, &lineno);
fclose (fi);
} else {
error ("%s:\nCan't open file %s for input", CommandName(), name);
} /* if */
} /* keyload */
/*****************************************************************************
BASIC FUNCTIONS ON KEYTABLES :
get, new, delete
all keytables created with new_keytable are deleted at program termination
*****************************************************************************/
/*****************************************************************************
NAME
get_keytable
PARAMETER
char * name
RESULT
the keytable with the name name, if it is already existing
else NULL
RETURN
KEYTABLE *
DESCRIPTION
search function on the hidden list of keytables
NOTES
useful only, if we are using multiple keytables
BUGS
EXAMPLES
SEE ALSO
INTERNALS
HISTORY
27 Jan 1993 b_null created
******************************************************************************/
KEYTABLE * get_keytable (char * name)
{
KEYTABLE * kt;
if (name == NULL) {
return (GetHead (&KeyTables));
} /* if wanted default */
for (kt = GetHead(&KeyTables); kt; kt = GetSucc(kt)) {
if (strcmp (kt->node.ln_Name, name) == 0) {
return (kt);
} /* if */
} /* for */
return (NULL);
} /* get_keytable */
/*****************************************************************************
NAME
delete_keytable
PARAMETER
KEYTABLE * kt
int force
RESULT
-/-
RETURN
void
DESCRIPTION
delete a full keytable
that function does NOT dlete the last keytable,
unless force is set to 1
NOTES
useful only, if we are using multiple keytables
that function does NOT take care of any references to a keytable
You must do that job on a higher abstraction-level
(e.g. in keycom.c - for all ED's if )
BUGS
EXAMPLES
SEE ALSO
INTERNALS
ausklinken aus der keytable-liste
loeschen der hash-entries
loeschen des namens
loeschen des bodies
HISTORY
27 Jan 1993 b_null created
******************************************************************************/
void delete_keytable (KEYTABLE * kt, int force)
{
if (kt) {
Remove (&kt->node);
if ((!force) && (!GetHead (&KeyTables))) {
AddHead ((struct List *)&KeyTables, &kt->node);
return;
} /* if */
dealloc_hash (kt);
DeallocFunc (kt->node.ln_Name);
FreeFunc (kt, sizeof(KEYTABLE));
} /* if */
} /* delete_keytable */
/*****************************************************************************
NAME
new_keytable
PARAMETER
char * name
int defaults
RESULT
either a new keytable, if there is not already one with that name
or the first keytable, that matches that name
if we have to create a new one, we can set defaults to 1 to
fill in the default-keytable
RETURN
KEYTABLE *
DESCRIPTION
NOTES
useful only, if we are using multiple keytables
if we can fill in only parts of the deafult-information,
we do NOT fail
BUGS
EXAMPLES
SEE ALSO
INTERNALS
HISTORY
27 Jan 1993 b_null created
******************************************************************************/
KEYTABLE * new_keytable (char * name, int defaults)
{
KEYTABLE * kt;
if (kt = get_keytable(name)) {
return (kt);
} /* if */
kt = AllocFunc (sizeof(KEYTABLE), MEMF_ANY);
if (kt == NULL) {
return (NULL);
} /* if */
setmem (kt, sizeof(KEYTABLE), 0);
kt->node.ln_Name = DupFunc (name, MEMF_ANY);
if (kt->node.ln_Name == NULL) {
FreeFunc (kt, sizeof (KEYTABLE));
return (NULL);
} /* if */
if (defaults) {
resethash (kt);
} /* if */
AddTail ((struct List *)&KeyTables, &kt->node);
return (kt);
} /* new_keytable */
/*****************************************************************************
NAME
exit_keytables
PARAMETER
void
RESULT
-/-
RETURN
void
DESCRIPTION
exit function for keytables
NOTES
useful only, if we are using multiple keytables
THIS is an __AUTOEXIT - function !!!!
BUGS
EXAMPLES
SEE ALSO
INTERNALS
HISTORY
27 Jan 1993 b_null created
******************************************************************************/
__autoexit
void exit_keytables (void)
{
KEYTABLE * kt;
/* PutStr ("key_exiting\n"); */
while (kt = GetHead (&KeyTables)) {
delete_keytable (kt, 1);
} /* while */
/* PutStr ("key_exited\n"); */
} /* exit_keytables */
/******************************************************************************
***** ENDE keytables.c
******************************************************************************/