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Revision: 1.3
Committed: Sat Jan 31 00:20:21 2004 UTC (20 years, 3 months ago) by pcg
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Branch: MAIN
Changes since 1.2: +1 -17 lines
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# User Rev Content
1 pcg 1.1 /*---------------------------------*C*--------------------------------------*
2     * File: grkelot.c
3     *--------------------------------------------------------------------------*
4 pcg 1.3 * $Id: grkelot.C,v 1.2 2003/11/24 17:31:27 pcg Exp $
5 pcg 1.1 *
6     * All portions of code are copyright by their respective author/s.
7     * Copyright (c) 1994,1995 Angelo Haritsis. All rights reserved.
8     * - original version
9     * Copyright (c) 1997,1998 Oezger Kesim <kesim@math.fu-berlin.de>
10     *
11     * This program is free software; you can redistribute it and/or modify
12     * it under the terms of the GNU General Public License as published by
13     * the Free Software Foundation; either version 2 of the License, or
14     * (at your option) any later version.
15     *
16     * This program is distributed in the hope that it will be useful,
17     * but WITHOUT ANY WARRANTY; without even the implied warranty of
18     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19     * GNU General Public License for more details.
20     *
21     * You should have received a copy of the GNU General Public License
22     * along with this program; if not, write to the Free Software
23     * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24     *--------------------------------------------------------------------------*
25     * Synopsis: string -> greek ELOT928 or IBM437 string;
26     * 4-state FSM implementation.
27     *
28     * System: Any (ANSI C)
29     *
30     * This is code derived from a more generic key remapper written by the same
31     * author and used in other environments. It was not written only
32     * for greek kbd bindings. An extension to other languages is easy
33     * (well don't know how the FSM lends itself to Far East languages).
34     *
35     * The FSM can have MAX_STATES states (change it for more).
36     * Each state contains:
37     * 1. many tranlsation tables (registered via kstate_add_xlat())
38     * 2. many switch codes for transition to other states (registered via
39     * kstate_add_switcher()) : limit is static now: MAX_SWITCHER
40     * 3. life: the number of xlations allowed in a state (0 = unlimited)
41     *
42     * Format of tranlation strings:
43     * <first>-<last>:n1,n2,n3,...
44     * Format of switcher string:
45     * A<char>:<state_no>
46     * (other switchers apart from A=ascii can be supported; not in this context)
47     * Format of life string:
48     * L<N> (N=0,1,...)
49     *-------------------------------------------------------------------------*
50     * Written by Angelo Haritis.
51     *
52     * Redistribution and use in source and binary forms are permitted provided
53     * that the above copyright notice and this paragraph are duplicated in all
54     * such forms and that any documentation, advertising materials, and other
55     * materials related to such distribution and use acknowledge that the
56     * software was developed by Angelo Haritsis.
57     * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
58     * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
59     * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
60     *
61     * NB: DO NOT ALTER! THIS CODE IS USED IN MANY PLATFORMS!!!
62     *
63     * TODO: make it more dynamic (linked lists is an idea but slower)
64     */
65    
66     #define RXVT /* define for use by rxvt */
67    
68     #ifdef RXVT
69     #include "../config.h" /* NECESSARY */
70     #include "rxvt.h" /* NECESSARY */
71     #include "grkelot.intpro" /* PROTOS for internal routines */
72     #endif /* RXVT */
73    
74     #ifdef GREEK_SUPPORT
75     #include "grkelot.h"
76     #include <stdlib.h>
77     #include <string.h>
78    
79     /* --- Macros, Types --------- */
80     #define MAX_STATES 4 /* max # states for the FSM */
81     #define MAX_SWITCHER 2U /* per state */
82     #define MAX_VAL 256 /* for temp allocation */
83    
84     typedef unsigned char u_char;
85     typedef unsigned int u_int;
86     typedef unsigned long u_long;
87    
88     typedef struct s_xlat {
89     u_int first, last;
90     u_int *pval; /* array of translated values */
91     } K_XLAT;
92    
93     typedef struct s_switch {
94     u_char type; /* Ascii, Virtual, Scan */
95     u_int code;
96     u_char nextstate;
97     u_char on; /* current state of key: 0 = off */
98     } K_SWITCH;
99    
100     typedef struct s_state {
101     u_int num_xlat; /* number of translations */
102     K_XLAT *xlat; /* State translations ((dynamic - realloc'ed) */
103     u_int num_switcher; /* number of switcher keys */
104     K_SWITCH switcher[MAX_SWITCHER]; /* switcher keys to other states */
105     u_char life; /* 0 = until switched by key */
106     u_char prev_state; /* filled when jumped to a new state */
107     } K_STATE;
108    
109     /* type for each one of the different greek standards (xlat types) */
110     typedef struct s_xlat_type {
111     char *plain;
112     char *accent;
113     char *accent_xtra;
114     char *umlaut;
115     char *acc_uml;
116     } XLAT_TYPE;
117    
118     /* --- Local Data ------------ */
119     static K_STATE State[MAX_STATES];
120    
121     /* Current State */
122     static u_char nStateNow = 0;
123     static K_STATE *pStateNow = &State[0];
124     static int GreekMode = GREEK_ELOT928;
125    
126     /*
127     * The following are hard-coded for now. The idea is that such strings would
128     * be read from a config file making it possible to change language/encodings
129     * more flexibly.
130     */
131     /* elot 928 xlations */
132     static char elot_xlat_plain[] = "65-122:193,194,216,196,197,214,195,199,201,206,202,203,204,205,207,208,81,209,211,212,200,217,87,215,213,198,91,92,93,94,95,96,225,226,248,228,229,246,227,231,233,238,234,235,236,237,239,240,113,241,243,244,232,249,242,247,245,230";
133    
134     /* c and s give copyright and section sign */
135     static char elot_xlat_acc[] = "65-122:182,194,216,196,184,214,195,185,186,206,202,203,204,205,188,208,81,209,211,212,200,191,87,215,190,198,91,92,93,94,95,96,220,226," /*248 */ "169,228,221,246,227,222,223,238,234,235,236,237,252,240,113,241," /*243 */ "167,244,232,254,242,247,253,230";
136     static char elot_xlat_acc_xtra[] = "46-62:183,47,48,49,50,51,52,53,54,55,56,57,58,59,171,61,187"; /* anw teleia, quotes */
137     static char elot_xlat_uml[] = "65-122:193,194,216,196,197,214,195,199,218,206,202,203,204,205,207,208,81,209,211,212,200,217,87,215,219,198,91,92,93,94,95,96,225,226,248,228,229,246,227,231,250,238,234,235,236,237,239,240,113,241,243,244,232,249,242,247,251,230";
138     static char elot_xlat_umacc[] = "65-122:193,194,216,196,197,214,195,199,201,206,202,203,204,205,207,208,81,209,211,212,200,217,87,215,213,198,91,92,93,94,95,96,225,226,248,228,229,246,227,231,192,238,234,235,236,237,239,240,113,241,243,244,232,249,242,247,224,230";
139    
140     /* ibm 437 xlations */
141     static char i437_xlat_plain[] = "65-122:128,129,150,131,132,148,130,134,136,141,137,138,139,140,142,143,81,144,145,146,135,151,87,149,147,133,91,92,93,94,95,96,152,153,175,155,156,173,154,158,160,165,161,162,163,164,166,167,113,168,169,171,159,224,170,174,172,157";
142     static char i437_xlat_acc[] = "65-122:234,129,150,131,235,148,130,236,237,141,137,138,139,140,238,143,81,144,145,146,135,240,87,149,239,133,91,92,93,94,95,96,225,153,175,155,226,173,154,227,229,165,161,162,163,164,230,167,113,168,169,171,159,233,170,174,231,157";
143     static char i437_xlat_acc_xtra[] = "46-46:250"; /* anw teleia */
144     static char i437_xlat_uml[] = "65-122:128,129,150,131,132,148,130,134,136,141,137,138,139,140,142,143,81,144,145,146,135,151,87,149,147,133,91,92,93,94,95,96,152,153,175,155,156,173,154,158,228,165,161,162,163,164,166,167,113,168,169,171,159,224,170,174,232,157";
145     static char i437_xlat_umacc[] = "65-122:128,129,150,131,132,148,130,134,136,141,137,138,139,140,142,143,81,144,145,146,135,151,87,149,147,133,91,92,93,94,95,96,152,153,175,155,156,173,154,158,42,165,161,162,163,164,166,167,113,168,169,171,159,224,170,174,42,157";
146    
147     /*
148     * currently ELOT928 and IBM437 are supported; easy to include others
149     * (not recommended: stick to just these 2 if not only the ELOT one)
150     */
151     static XLAT_TYPE xlat_type[] =
152     {
153     {elot_xlat_plain, elot_xlat_acc, elot_xlat_acc_xtra, elot_xlat_uml, elot_xlat_umacc},
154     {i437_xlat_plain, i437_xlat_acc, i437_xlat_acc_xtra, i437_xlat_uml, i437_xlat_umacc},
155     };
156    
157     /* the current trasnaltion type */
158     static XLAT_TYPE *xlat_now = &xlat_type[GREEK_ELOT928];
159    
160     #define NUM_XLAT_TYPES (sizeof(xlat_type) / sizeof(xlat_type[0]))
161    
162     static void kstate_add_xlat(char *str);
163     static void kstate_add_switcher(char *str);
164     static void kstate_set_life(char *str);
165    
166     /* --- Functions ------------- */
167     void
168     kstate_setcurr(int stateno)
169     {
170     u_char prev_state;
171    
172     if ((u_int) stateno > (u_int) MAX_STATES)
173     return;
174     if (pStateNow->life == 1)
175     prev_state = pStateNow->prev_state;
176     else
177     prev_state = nStateNow;
178     pStateNow = &State[nStateNow = stateno];
179     pStateNow->prev_state = prev_state;
180     }
181    
182     void
183     kstate_init(void)
184     {
185     pStateNow->num_xlat = pStateNow->num_switcher = pStateNow->life = pStateNow->prev_state = 0;
186     pStateNow->xlat = NULL;
187     }
188    
189     void
190     kstate_end(void)
191     {
192     int i;
193    
194     for (i = 0; i < pStateNow->num_xlat; i++)
195     free(pStateNow->xlat[i].pval);
196     if (pStateNow->num_xlat > 0)
197     free(pStateNow->xlat);
198     }
199    
200     /*
201     * Hard coded ELOT-928 translations. Could read these from an rc-type file
202     * to support other remappers.
203     */
204     void
205     kstate_init_all(int greek_mode)
206     {
207     /* the translation tables for the 4 FSM states for ELOT-928 mappings */
208     int i;
209    
210     for (i = 0; i < MAX_STATES; i++) {
211     kstate_setcurr(i);
212     kstate_init();
213     }
214     if (greek_mode < 0 || greek_mode >= NUM_XLAT_TYPES) /* avoid death */
215     greek_mode = GREEK_ELOT928;
216     xlat_now = &xlat_type[greek_mode];
217     kstate_setcurr(0);
218     kstate_add_xlat(xlat_now->plain);
219     kstate_add_switcher("A;:1");
220     kstate_add_switcher("A::2");
221     kstate_set_life("L0");
222    
223     kstate_setcurr(1);
224     kstate_add_xlat(xlat_now->accent);
225     kstate_add_xlat(xlat_now->accent_xtra);
226     kstate_add_switcher("A::3");
227     kstate_set_life("L1");
228    
229     kstate_setcurr(2);
230     kstate_add_xlat(xlat_now->umlaut);
231     kstate_add_switcher("A;:3");
232     kstate_set_life("L1");
233    
234     kstate_setcurr(3);
235     kstate_add_xlat(xlat_now->acc_uml);
236     kstate_set_life("L1");
237     }
238    
239     void
240     kstate_end_all(void)
241     {
242     int i;
243    
244     for (i = 0; i < MAX_STATES; i++) {
245     kstate_setcurr(i);
246     kstate_end();
247     }
248     kstate_setcurr(0);
249     }
250    
251     /*
252     * reset FSM
253     */
254     void
255     kstate_reset(void)
256     {
257     kstate_setcurr(0);
258     }
259    
260     void
261     kstate_add_xlat(char *str)
262     {
263     K_XLAT *xlat;
264     u_int *pval_tmp;
265     char *sval;
266     int i;
267    
268     if (str == NULL)
269     return;
270     /* add a new xlat table in state */
271     if (pStateNow->num_xlat == 0) {
272     pStateNow->xlat = malloc(sizeof(K_XLAT));
273     } else /* prefer contiguous data, realloc */
274     pStateNow->xlat = realloc(pStateNow->xlat, (pStateNow->num_xlat + 1) * sizeof(K_XLAT));
275     xlat = &pStateNow->xlat[pStateNow->num_xlat];
276     /* parse str and derive first, last, values */
277     xlat->first = (u_int) atoi(strtok(str, "-"));
278     xlat->last = (u_int) atoi(strtok(NULL, ":"));
279     i = 0;
280     pval_tmp = calloc(MAX_VAL, sizeof(K_XLAT));
281     while ((sval = strtok(NULL, ",")) != NULL)
282     pval_tmp[i++] = (u_int) (atoi(sval));
283     xlat->pval = calloc(i, sizeof(K_XLAT));
284     if (xlat->pval != NULL)
285     memcpy(xlat->pval, pval_tmp, i * sizeof(u_int));
286     free(pval_tmp);
287     pStateNow->num_xlat++;
288     }
289    
290     /*
291     * Ascii only for this implementation
292     */
293     void
294     kstate_add_switcher(char *str)
295     {
296     K_SWITCH *switcher;
297    
298     if (str == NULL)
299     return;
300     if (pStateNow->num_switcher >= MAX_SWITCHER)
301     return;
302     switcher = &pStateNow->switcher[pStateNow->num_switcher];
303     switch (switcher->type = str[0]) {
304     case 'A': /* ascii eg: A;:2 */
305     switcher->code = str[1];
306     switcher->nextstate = atoi(&str[3]);
307     break;
308     }
309     switcher->on = 0;
310     pStateNow->num_switcher++;
311     }
312    
313     /* L1 or L0 */
314     void
315     kstate_set_life(char *str)
316     {
317     pStateNow->life = atoi(&str[1]);
318     }
319    
320     unsigned int
321     kstate_cxlat(unsigned int c)
322     {
323     int i;
324    
325     /* check for ascii switcher */
326     for (i = 0; i < pStateNow->num_switcher; i++)
327     if (pStateNow->switcher[i].type == 'A' && /* only ascii here */
328     c == pStateNow->switcher[i].code) {
329     kstate_setcurr(pStateNow->switcher[i].nextstate);
330     pStateNow->switcher[i].on = 1;
331     return ((unsigned int)-1);
332     }
333     /* do translation */
334     for (i = 0; i < pStateNow->num_xlat; i++)
335     if (c >= pStateNow->xlat[i].first && c <= pStateNow->xlat[i].last) {
336     c = pStateNow->xlat[i].pval[c - pStateNow->xlat[i].first];
337     break;
338     }
339     /* switch back to previous state if life of current is 1 */
340     if (pStateNow->life == 1)
341     kstate_setcurr(pStateNow->prev_state);
342     return (c);
343     }
344    
345     #ifdef RXVT
346     void
347     greek_init(void)
348     {
349     kstate_init_all(GreekMode);
350     }
351    
352     void
353     greek_end(void)
354     {
355     kstate_end_all();
356     }
357    
358     void
359     greek_reset(void)
360     {
361     kstate_reset();
362     }
363    
364     void
365     greek_setmode(int greek_mode)
366     {
367     GreekMode = greek_mode;
368     }
369    
370     int
371     greek_getmode(void)
372     {
373     return (GreekMode);
374     }
375    
376     /*
377     * xlate a given string in-place - return new string length
378     */
379     int
380     greek_xlat(char *s, int num_chars)
381     {
382     int i, count;
383     unsigned int c;
384    
385     for (i = 0, count = 0; i < num_chars; i++) {
386     c = kstate_cxlat((unsigned int)s[i]);
387     if (c != -1)
388     s[count++] = (char)c;
389     }
390     s[count] = '\0';
391     return (count);
392    
393     }
394    
395     #ifdef TEST
396     int
397     main(void)
398     {
399     /*char text[] = "abcdef;aGDZXC"; */
400     char text[] = "abcdef;a:ibgdezhuiklmnjoprstyfxcv";
401    
402     kstate_init_all(GREEK_ELOT928);
403     printf("text: %s\n", text);
404     greek_xlat(text, strlen(text));
405     printf("xlat'ed text: %s\n", text);
406     kstate_end_all();
407     return 0;
408     }
409     #endif
410     #endif /* RXVT */
411    
412     #endif /* GREEK_SUPPORT */