1 // SPDX-License-Identifier: GPL-2.0
2 /* Internationalization implementation.  Includes definitions of English
3  * string arrays, and the i18n pointer.
4  */
5 
6 #include <linux/slab.h>		/* For kmalloc. */
7 #include <linux/ctype.h>
8 #include <linux/module.h>
9 #include <linux/string.h>
10 #include "speakup.h"
11 #include "spk_priv.h"
12 
13 static char *speakup_msgs[MSG_LAST_INDEX];
14 static char *speakup_default_msgs[MSG_LAST_INDEX] = {
15 	[MSG_BLANK] = "blank",
16 	[MSG_IAM_ALIVE] = "I'm aLive!",
17 	[MSG_YOU_KILLED_SPEAKUP] = "You killed speakup!",
18 	[MSG_HEY_THATS_BETTER] = "hey. That's better!",
19 	[MSG_YOU_TURNED_ME_OFF] = "You turned me off!",
20 	[MSG_PARKED] = "parked!",
21 	[MSG_UNPARKED] = "unparked!",
22 	[MSG_MARK] = "mark",
23 	[MSG_CUT] = "cut",
24 	[MSG_MARK_CLEARED] = "mark, cleared",
25 	[MSG_PASTE] = "paste",
26 	[MSG_BRIGHT] = "bright",
27 	[MSG_ON_BLINKING] = "on blinking",
28 	[MSG_OFF] = "off",
29 	[MSG_ON] = "on",
30 	[MSG_NO_WINDOW] = "no window",
31 	[MSG_CURSORING_OFF] = "cursoring off",
32 	[MSG_CURSORING_ON] = "cursoring on",
33 	[MSG_HIGHLIGHT_TRACKING] = "highlight tracking",
34 	[MSG_READ_WINDOW] = "read windo",
35 	[MSG_READ_ALL] = "read all",
36 	[MSG_EDIT_DONE] = "edit done",
37 	[MSG_WINDOW_ALREADY_SET] = "window already set, clear then reset",
38 	[MSG_END_BEFORE_START] = "error end before start",
39 	[MSG_WINDOW_CLEARED] = "window cleared",
40 	[MSG_WINDOW_SILENCED] = "window silenced",
41 	[MSG_WINDOW_SILENCE_DISABLED] = "window silence disabled",
42 	[MSG_ERROR] = "error",
43 	[MSG_GOTO_CANCELED] = "goto canceled",
44 	[MSG_GOTO] = "go to?",
45 	[MSG_LEAVING_HELP] = "leaving help",
46 	[MSG_IS_UNASSIGNED] = "is unassigned",
47 	[MSG_HELP_INFO] =
48 	"press space to exit, up or down to scroll, or a letter to go to a command",
49 	[MSG_EDGE_TOP] = "top,",
50 	[MSG_EDGE_BOTTOM] = "bottom,",
51 	[MSG_EDGE_LEFT] = "left,",
52 	[MSG_EDGE_RIGHT] = "right,",
53 	[MSG_NUMBER] = "number",
54 	[MSG_SPACE] = "space",
55 	[MSG_START] = "start",
56 	[MSG_END] = "end",
57 	[MSG_CTRL] = "control-",
58 	[MSG_DISJUNCTION] = "or",
59 
60 /* Messages with embedded format specifiers. */
61 	[MSG_POS_INFO] = "line %ld, col %ld, t t y %d",
62 	[MSG_CHAR_INFO] = "hex %02x, decimal %d",
63 	[MSG_REPEAT_DESC] = "times %d .",
64 	[MSG_REPEAT_DESC2] = "repeated %d .",
65 	[MSG_WINDOW_LINE] = "window is line %d",
66 	[MSG_WINDOW_BOUNDARY] = "%s at line %d, column %d",
67 	[MSG_EDIT_PROMPT] = "edit  %s, press space when done",
68 	[MSG_NO_COMMAND] = "no commands for %c",
69 	[MSG_KEYDESC] = "is %s",
70 
71 	/* Control keys. */
72 	/* Most of these duplicate the entries in state names. */
73 	[MSG_CTL_SHIFT] = "shift",
74 	[MSG_CTL_ALTGR] = "altgr",
75 	[MSG_CTL_CONTROL] = "control",
76 	[MSG_CTL_ALT] = "alt",
77 	[MSG_CTL_LSHIFT] = "l shift",
78 	[MSG_CTL_SPEAKUP] = "speakup",
79 	[MSG_CTL_LCONTROL] = "l control",
80 	[MSG_CTL_RCONTROL] = "r control",
81 	[MSG_CTL_CAPSSHIFT] = "caps shift",
82 
83 	/* Color names. */
84 	[MSG_COLOR_BLACK] = "black",
85 	[MSG_COLOR_BLUE] = "blue",
86 	[MSG_COLOR_GREEN] = "green",
87 	[MSG_COLOR_CYAN] = "cyan",
88 	[MSG_COLOR_RED] = "red",
89 	[MSG_COLOR_MAGENTA] = "magenta",
90 	[MSG_COLOR_YELLOW] = "yellow",
91 	[MSG_COLOR_WHITE] = "white",
92 	[MSG_COLOR_GREY] = "grey",
93 
94 	/* Names of key states. */
95 	[MSG_STATE_DOUBLE] = "double",
96 	[MSG_STATE_SPEAKUP] = "speakup",
97 	[MSG_STATE_ALT] = "alt",
98 	[MSG_STATE_CONTROL] = "ctrl",
99 	[MSG_STATE_ALTGR] = "altgr",
100 	[MSG_STATE_SHIFT] = "shift",
101 
102 	/* Key names. */
103 	[MSG_KEYNAME_ESC] = "escape",
104 	[MSG_KEYNAME_1] = "1",
105 	[MSG_KEYNAME_2] = "2",
106 	[MSG_KEYNAME_3] = "3",
107 	[MSG_KEYNAME_4] = "4",
108 	[MSG_KEYNAME_5] = "5",
109 	[MSG_KEYNAME_6] = "6",
110 	[MSG_KEYNAME_7] = "7",
111 	[MSG_KEYNAME_8] = "8",
112 	[MSG_KEYNAME_9] = "9",
113 	[MSG_KEYNAME_0] = "0",
114 	[MSG_KEYNAME_DASH] = "minus",
115 	[MSG_KEYNAME_EQUAL] = "equal",
116 	[MSG_KEYNAME_BS] = "back space",
117 	[MSG_KEYNAME_TAB] = "tab",
118 	[MSG_KEYNAME_Q] = "q",
119 	[MSG_KEYNAME_W] = "w",
120 	[MSG_KEYNAME_E] = "e",
121 	[MSG_KEYNAME_R] = "r",
122 	[MSG_KEYNAME_T] = "t",
123 	[MSG_KEYNAME_Y] = "y",
124 	[MSG_KEYNAME_U] = "u",
125 	[MSG_KEYNAME_I] = "i",
126 	[MSG_KEYNAME_O] = "o",
127 	[MSG_KEYNAME_P] = "p",
128 	[MSG_KEYNAME_LEFTBRACE] = "left brace",
129 	[MSG_KEYNAME_RIGHTBRACE] = "right brace",
130 	[MSG_KEYNAME_ENTER] = "enter",
131 	[MSG_KEYNAME_LEFTCTRL] = "left control",
132 	[MSG_KEYNAME_A] = "a",
133 	[MSG_KEYNAME_S] = "s",
134 	[MSG_KEYNAME_D] = "d",
135 	[MSG_KEYNAME_F] = "f",
136 	[MSG_KEYNAME_G] = "g",
137 	[MSG_KEYNAME_H] = "h",
138 	[MSG_KEYNAME_J] = "j",
139 	[MSG_KEYNAME_K] = "k",
140 	[MSG_KEYNAME_L] = "l",
141 	[MSG_KEYNAME_SEMICOLON] = "semicolon",
142 	[MSG_KEYNAME_SINGLEQUOTE] = "apostrophe",
143 	[MSG_KEYNAME_GRAVE] = "accent",
144 	[MSG_KEYNAME_LEFTSHFT] = "left shift",
145 	[MSG_KEYNAME_BACKSLASH] = "back slash",
146 	[MSG_KEYNAME_Z] = "z",
147 	[MSG_KEYNAME_X] = "x",
148 	[MSG_KEYNAME_C] = "c",
149 	[MSG_KEYNAME_V] = "v",
150 	[MSG_KEYNAME_B] = "b",
151 	[MSG_KEYNAME_N] = "n",
152 	[MSG_KEYNAME_M] = "m",
153 	[MSG_KEYNAME_COMMA] = "comma",
154 	[MSG_KEYNAME_DOT] = "dot",
155 	[MSG_KEYNAME_SLASH] = "slash",
156 	[MSG_KEYNAME_RIGHTSHFT] = "right shift",
157 	[MSG_KEYNAME_KPSTAR] = "keypad asterisk",
158 	[MSG_KEYNAME_LEFTALT] = "left alt",
159 	[MSG_KEYNAME_SPACE] = "space",
160 	[MSG_KEYNAME_CAPSLOCK] = "caps lock",
161 	[MSG_KEYNAME_F1] = "f1",
162 	[MSG_KEYNAME_F2] = "f2",
163 	[MSG_KEYNAME_F3] = "f3",
164 	[MSG_KEYNAME_F4] = "f4",
165 	[MSG_KEYNAME_F5] = "f5",
166 	[MSG_KEYNAME_F6] = "f6",
167 	[MSG_KEYNAME_F7] = "f7",
168 	[MSG_KEYNAME_F8] = "f8",
169 	[MSG_KEYNAME_F9] = "f9",
170 	[MSG_KEYNAME_F10] = "f10",
171 	[MSG_KEYNAME_NUMLOCK] = "num lock",
172 	[MSG_KEYNAME_SCROLLLOCK] = "scroll lock",
173 	[MSG_KEYNAME_KP7] = "keypad 7",
174 	[MSG_KEYNAME_KP8] = "keypad 8",
175 	[MSG_KEYNAME_KP9] = "keypad 9",
176 	[MSG_KEYNAME_KPMINUS] = "keypad minus",
177 	[MSG_KEYNAME_KP4] = "keypad 4",
178 	[MSG_KEYNAME_KP5] = "keypad 5",
179 	[MSG_KEYNAME_KP6] = "keypad 6",
180 	[MSG_KEYNAME_KPPLUS] = "keypad plus",
181 	[MSG_KEYNAME_KP1] = "keypad 1",
182 	[MSG_KEYNAME_KP2] = "keypad 2",
183 	[MSG_KEYNAME_KP3] = "keypad 3",
184 	[MSG_KEYNAME_KP0] = "keypad 0",
185 	[MSG_KEYNAME_KPDOT] = "keypad dot",
186 	[MSG_KEYNAME_103RD] = "103rd",
187 	[MSG_KEYNAME_F13] = "f13",
188 	[MSG_KEYNAME_102ND] = "102nd",
189 	[MSG_KEYNAME_F11] = "f11",
190 	[MSG_KEYNAME_F12] = "f12",
191 	[MSG_KEYNAME_F14] = "f14",
192 	[MSG_KEYNAME_F15] = "f15",
193 	[MSG_KEYNAME_F16] = "f16",
194 	[MSG_KEYNAME_F17] = "f17",
195 	[MSG_KEYNAME_F18] = "f18",
196 	[MSG_KEYNAME_F19] = "f19",
197 	[MSG_KEYNAME_F20] = "f20",
198 	[MSG_KEYNAME_KPENTER] = "keypad enter",
199 	[MSG_KEYNAME_RIGHTCTRL] = "right control",
200 	[MSG_KEYNAME_KPSLASH] = "keypad slash",
201 	[MSG_KEYNAME_SYSRQ] = "sysrq",
202 	[MSG_KEYNAME_RIGHTALT] = "right alt",
203 	[MSG_KEYNAME_LF] = "line feed",
204 	[MSG_KEYNAME_HOME] = "home",
205 	[MSG_KEYNAME_UP] = "up",
206 	[MSG_KEYNAME_PGUP] = "page up",
207 	[MSG_KEYNAME_LEFT] = "left",
208 	[MSG_KEYNAME_RIGHT] = "right",
209 	[MSG_KEYNAME_END] = "end",
210 	[MSG_KEYNAME_DOWN] = "down",
211 	[MSG_KEYNAME_PGDN] = "page down",
212 	[MSG_KEYNAME_INS] = "insert",
213 	[MSG_KEYNAME_DEL] = "delete",
214 	[MSG_KEYNAME_MACRO] = "macro",
215 	[MSG_KEYNAME_MUTE] = "mute",
216 	[MSG_KEYNAME_VOLDOWN] = "volume down",
217 	[MSG_KEYNAME_VOLUP] = "volume up",
218 	[MSG_KEYNAME_POWER] = "power",
219 	[MSG_KEYNAME_KPEQUAL] = "keypad equal",
220 	[MSG_KEYNAME_KPPLUSDASH] = "keypad plusminus",
221 	[MSG_KEYNAME_PAUSE] = "pause",
222 	[MSG_KEYNAME_F21] = "f21",
223 	[MSG_KEYNAME_F22] = "f22",
224 	[MSG_KEYNAME_F23] = "f23",
225 	[MSG_KEYNAME_F24] = "f24",
226 	[MSG_KEYNAME_KPCOMMA] = "keypad comma",
227 	[MSG_KEYNAME_LEFTMETA] = "left meta",
228 	[MSG_KEYNAME_RIGHTMETA] = "right meta",
229 	[MSG_KEYNAME_COMPOSE] = "compose",
230 	[MSG_KEYNAME_STOP] = "stop",
231 	[MSG_KEYNAME_AGAIN] = "again",
232 	[MSG_KEYNAME_PROPS] = "props",
233 	[MSG_KEYNAME_UNDO] = "undo",
234 	[MSG_KEYNAME_FRONT] = "front",
235 	[MSG_KEYNAME_COPY] = "copy",
236 	[MSG_KEYNAME_OPEN] = "open",
237 	[MSG_KEYNAME_PASTE] = "paste",
238 	[MSG_KEYNAME_FIND] = "find",
239 	[MSG_KEYNAME_CUT] = "cut",
240 	[MSG_KEYNAME_HELP] = "help",
241 	[MSG_KEYNAME_MENU] = "menu",
242 	[MSG_KEYNAME_CALC] = "calc",
243 	[MSG_KEYNAME_SETUP] = "setup",
244 	[MSG_KEYNAME_SLEEP] = "sleep",
245 	[MSG_KEYNAME_WAKEUP] = "wakeup",
246 	[MSG_KEYNAME_FILE] = "file",
247 	[MSG_KEYNAME_SENDFILE] = "send file",
248 	[MSG_KEYNAME_DELFILE] = "delete file",
249 	[MSG_KEYNAME_XFER] = "transfer",
250 	[MSG_KEYNAME_PROG1] = "prog1",
251 	[MSG_KEYNAME_PROG2] = "prog2",
252 	[MSG_KEYNAME_WWW] = "www",
253 	[MSG_KEYNAME_MSDOS] = "msdos",
254 	[MSG_KEYNAME_COFFEE] = "coffee",
255 	[MSG_KEYNAME_DIRECTION] = "direction",
256 	[MSG_KEYNAME_CYCLEWINDOWS] = "cycle windows",
257 	[MSG_KEYNAME_MAIL] = "mail",
258 	[MSG_KEYNAME_BOOKMARKS] = "bookmarks",
259 	[MSG_KEYNAME_COMPUTER] = "computer",
260 	[MSG_KEYNAME_BACK] = "back",
261 	[MSG_KEYNAME_FORWARD] = "forward",
262 	[MSG_KEYNAME_CLOSECD] = "close cd",
263 	[MSG_KEYNAME_EJECTCD] = "eject cd",
264 	[MSG_KEYNAME_EJECTCLOSE] = "eject close cd",
265 	[MSG_KEYNAME_NEXTSONG] = "next song",
266 	[MSG_KEYNAME_PLAYPAUSE] = "play pause",
267 	[MSG_KEYNAME_PREVSONG] = "previous song",
268 	[MSG_KEYNAME_STOPCD] = "stop cd",
269 	[MSG_KEYNAME_RECORD] = "record",
270 	[MSG_KEYNAME_REWIND] = "rewind",
271 	[MSG_KEYNAME_PHONE] = "phone",
272 	[MSG_KEYNAME_ISO] = "iso",
273 	[MSG_KEYNAME_CONFIG] = "config",
274 	[MSG_KEYNAME_HOMEPG] = "home page",
275 	[MSG_KEYNAME_REFRESH] = "refresh",
276 	[MSG_KEYNAME_EXIT] = "exit",
277 	[MSG_KEYNAME_MOVE] = "move",
278 	[MSG_KEYNAME_EDIT] = "edit",
279 	[MSG_KEYNAME_SCROLLUP] = "scroll up",
280 	[MSG_KEYNAME_SCROLLDN] = "scroll down",
281 	[MSG_KEYNAME_KPLEFTPAR] = "keypad left paren",
282 	[MSG_KEYNAME_KPRIGHTPAR] = "keypad right paren",
283 
284 	/* Function names. */
285 	[MSG_FUNCNAME_ATTRIB_BLEEP_DEC] = "attribute bleep decrement",
286 	[MSG_FUNCNAME_ATTRIB_BLEEP_INC] = "attribute bleep increment",
287 	[MSG_FUNCNAME_BLEEPS_DEC] = "bleeps decrement",
288 	[MSG_FUNCNAME_BLEEPS_INC] = "bleeps increment",
289 	[MSG_FUNCNAME_CHAR_FIRST] = "character, first",
290 	[MSG_FUNCNAME_CHAR_LAST] = "character, last",
291 	[MSG_FUNCNAME_CHAR_CURRENT] = "character, say current",
292 	[MSG_FUNCNAME_CHAR_HEX_AND_DEC] = "character, say hex and decimal",
293 	[MSG_FUNCNAME_CHAR_NEXT] = "character, say next",
294 	[MSG_FUNCNAME_CHAR_PHONETIC] = "character, say phonetic",
295 	[MSG_FUNCNAME_CHAR_PREVIOUS] = "character, say previous",
296 	[MSG_FUNCNAME_CURSOR_PARK] = "cursor park",
297 	[MSG_FUNCNAME_CUT] = "cut",
298 	[MSG_FUNCNAME_EDIT_DELIM] = "edit delimiters",
299 	[MSG_FUNCNAME_EDIT_EXNUM] = "edit exnum",
300 	[MSG_FUNCNAME_EDIT_MOST] = "edit most",
301 	[MSG_FUNCNAME_EDIT_REPEATS] = "edit repeats",
302 	[MSG_FUNCNAME_EDIT_SOME] = "edit some",
303 	[MSG_FUNCNAME_GOTO] = "go to",
304 	[MSG_FUNCNAME_GOTO_BOTTOM] = "go to bottom edge",
305 	[MSG_FUNCNAME_GOTO_LEFT] = "go to left edge",
306 	[MSG_FUNCNAME_GOTO_RIGHT] = "go to right edge",
307 	[MSG_FUNCNAME_GOTO_TOP] = "go to top edge",
308 	[MSG_FUNCNAME_HELP] = "help",
309 	[MSG_FUNCNAME_LINE_SAY_CURRENT] = "line, say current",
310 	[MSG_FUNCNAME_LINE_SAY_NEXT] = "line, say next",
311 	[MSG_FUNCNAME_LINE_SAY_PREVIOUS] = "line, say previous",
312 	[MSG_FUNCNAME_LINE_SAY_WITH_INDENT] = "line, say with indent",
313 	[MSG_FUNCNAME_PASTE] = "paste",
314 	[MSG_FUNCNAME_PITCH_DEC] = "pitch decrement",
315 	[MSG_FUNCNAME_PITCH_INC] = "pitch increment",
316 	[MSG_FUNCNAME_PUNC_DEC] = "punctuation decrement",
317 	[MSG_FUNCNAME_PUNC_INC] = "punctuation increment",
318 	[MSG_FUNCNAME_PUNC_LEVEL_DEC] = "punc level decrement",
319 	[MSG_FUNCNAME_PUNC_LEVEL_INC] = "punc level increment",
320 	[MSG_FUNCNAME_QUIET] = "quiet",
321 	[MSG_FUNCNAME_RATE_DEC] = "rate decrement",
322 	[MSG_FUNCNAME_RATE_INC] = "rate increment",
323 	[MSG_FUNCNAME_READING_PUNC_DEC] = "reading punctuation decrement",
324 	[MSG_FUNCNAME_READING_PUNC_INC] = "reading punctuation increment",
325 	[MSG_FUNCNAME_SAY_ATTRIBUTES] = "say attributes",
326 	[MSG_FUNCNAME_SAY_FROM_LEFT] = "say from left",
327 	[MSG_FUNCNAME_SAY_FROM_TOP] = "say from top",
328 	[MSG_FUNCNAME_SAY_POSITION] = "say position",
329 	[MSG_FUNCNAME_SAY_SCREEN] = "say screen",
330 	[MSG_FUNCNAME_SAY_TO_BOTTOM] = "say to bottom",
331 	[MSG_FUNCNAME_SAY_TO_RIGHT] = "say to right",
332 	[MSG_FUNCNAME_SPEAKUP] = "speakup",
333 	[MSG_FUNCNAME_SPEAKUP_LOCK] = "speakup lock",
334 	[MSG_FUNCNAME_SPEAKUP_OFF] = "speakup off",
335 	[MSG_FUNCNAME_SPEECH_KILL] = "speech kill",
336 	[MSG_FUNCNAME_SPELL_DELAY_DEC] = "spell delay decrement",
337 	[MSG_FUNCNAME_SPELL_DELAY_INC] = "spell delay increment",
338 	[MSG_FUNCNAME_SPELL_WORD] = "spell word",
339 	[MSG_FUNCNAME_SPELL_WORD_PHONETICALLY] = "spell word phonetically",
340 	[MSG_FUNCNAME_TONE_DEC] = "tone decrement",
341 	[MSG_FUNCNAME_TONE_INC] = "tone increment",
342 	[MSG_FUNCNAME_VOICE_DEC] = "voice decrement",
343 	[MSG_FUNCNAME_VOICE_INC] = "voice increment",
344 	[MSG_FUNCNAME_VOLUME_DEC] = "volume decrement",
345 	[MSG_FUNCNAME_VOLUME_INC] = "volume increment",
346 	[MSG_FUNCNAME_WINDOW_CLEAR] = "window, clear",
347 	[MSG_FUNCNAME_WINDOW_SAY] = "window, say",
348 	[MSG_FUNCNAME_WINDOW_SET] = "window, set",
349 	[MSG_FUNCNAME_WINDOW_SILENCE] = "window, silence",
350 	[MSG_FUNCNAME_WORD_SAY_CURRENT] = "word, say current",
351 	[MSG_FUNCNAME_WORD_SAY_NEXT] = "word, say next",
352 	[MSG_FUNCNAME_WORD_SAY_PREVIOUS] = "word, say previous",
353 };
354 
355 static struct msg_group_t all_groups[] = {
356 	{
357 		.name = "ctl_keys",
358 		.start = MSG_CTL_START,
359 		.end = MSG_CTL_END,
360 	},
361 	{
362 		.name = "colors",
363 		.start = MSG_COLORS_START,
364 		.end = MSG_COLORS_END,
365 	},
366 	{
367 		.name = "formatted",
368 		.start = MSG_FORMATTED_START,
369 		.end = MSG_FORMATTED_END,
370 	},
371 	{
372 		.name = "function_names",
373 		.start = MSG_FUNCNAMES_START,
374 		.end = MSG_FUNCNAMES_END,
375 	},
376 	{
377 		.name = "key_names",
378 		.start = MSG_KEYNAMES_START,
379 		.end = MSG_KEYNAMES_END,
380 	},
381 	{
382 		.name = "announcements",
383 		.start = MSG_ANNOUNCEMENTS_START,
384 		.end = MSG_ANNOUNCEMENTS_END,
385 	},
386 	{
387 		.name = "states",
388 		.start = MSG_STATES_START,
389 		.end = MSG_STATES_END,
390 	},
391 };
392 
393 static const  int num_groups = ARRAY_SIZE(all_groups);
394 
395 char *spk_msg_get(enum msg_index_t index)
396 {
397 	return speakup_msgs[index];
398 }
399 
400 /*
401  * Function: next_specifier
402  * Finds the start of the next format specifier in the argument string.
403  * Return value: pointer to start of format
404  * specifier, or NULL if no specifier exists.
405  */
406 static char *next_specifier(char *input)
407 {
408 	int found = 0;
409 	char *next_percent = input;
410 
411 	while (next_percent && !found) {
412 		next_percent = strchr(next_percent, '%');
413 		if (next_percent) {
414 			/* skip over doubled percent signs */
415 			while (next_percent[0] == '%' &&
416 			       next_percent[1] == '%')
417 				next_percent += 2;
418 			if (*next_percent == '%')
419 				found = 1;
420 			else if (*next_percent == '\0')
421 				next_percent = NULL;
422 		}
423 	}
424 
425 	return next_percent;
426 }
427 
428 /* Skip over 0 or more flags. */
429 static char *skip_flags(char *input)
430 {
431 	while ((*input != '\0') && strchr(" 0+-#", *input))
432 		input++;
433 	return input;
434 }
435 
436 /* Skip over width.precision, if it exists. */
437 static char *skip_width(char *input)
438 {
439 	while (isdigit(*input))
440 		input++;
441 	if (*input == '.') {
442 		input++;
443 		while (isdigit(*input))
444 			input++;
445 	}
446 	return input;
447 }
448 
449 /*
450  * Skip past the end of the conversion part.
451  * Note that this code only accepts a handful of conversion specifiers:
452  * c d s x and ld.  Not accidental; these are exactly the ones used in
453  * the default group of formatted messages.
454  */
455 static char *skip_conversion(char *input)
456 {
457 	if ((input[0] == 'l') && (input[1] == 'd'))
458 		input += 2;
459 	else if ((*input != '\0') && strchr("cdsx", *input))
460 		input++;
461 	return input;
462 }
463 
464 /*
465  * Function: find_specifier_end
466  * Return a pointer to the end of the format specifier.
467  */
468 static char *find_specifier_end(char *input)
469 {
470 	input++;		/* Advance over %. */
471 	input = skip_flags(input);
472 	input = skip_width(input);
473 	input = skip_conversion(input);
474 	return input;
475 }
476 
477 /*
478  * Function: compare_specifiers
479  * Compare the format specifiers pointed to by *input1 and *input2.
480  * Return true if they are the same, false otherwise.
481  * Advance *input1 and *input2 so that they point to the character following
482  * the end of the specifier.
483  */
484 static bool compare_specifiers(char **input1, char **input2)
485 {
486 	bool same = false;
487 	char *end1 = find_specifier_end(*input1);
488 	char *end2 = find_specifier_end(*input2);
489 	size_t length1 = end1 - *input1;
490 	size_t length2 = end2 - *input2;
491 
492 	if ((length1 == length2) && !memcmp(*input1, *input2, length1))
493 		same = true;
494 
495 	*input1 = end1;
496 	*input2 = end2;
497 	return same;
498 }
499 
500 /*
501  * Function: fmt_validate
502  * Check that two format strings contain the same number of format specifiers,
503  * and that the order of specifiers is the same in both strings.
504  * Return true if the condition holds, false if it doesn't.
505  */
506 static bool fmt_validate(char *template, char *user)
507 {
508 	bool valid = true;
509 	bool still_comparing = true;
510 	char *template_ptr = template;
511 	char *user_ptr = user;
512 
513 	while (still_comparing && valid) {
514 		template_ptr = next_specifier(template_ptr);
515 		user_ptr = next_specifier(user_ptr);
516 		if (template_ptr && user_ptr) {
517 			/* Both have at least one more specifier. */
518 			valid = compare_specifiers(&template_ptr, &user_ptr);
519 		} else {
520 			/* No more format specifiers in one or both strings. */
521 			still_comparing = false;
522 			/* See if one has more specifiers than the other. */
523 			if (template_ptr || user_ptr)
524 				valid = false;
525 		}
526 	}
527 	return valid;
528 }
529 
530 /*
531  * Function: msg_set
532  * Description: Add a user-supplied message to the user_messages array.
533  * The message text is copied to a memory area allocated with kmalloc.
534  * If the function fails, then user_messages is untouched.
535  * Arguments:
536  * - index: a message number, as found in i18n.h.
537  * - text:  text of message.  Not NUL-terminated.
538  * - length: number of bytes in text.
539  * Failure conditions:
540  * -EINVAL -  Invalid format specifiers in formatted message or illegal index.
541  * -ENOMEM -  Unable to allocate memory.
542  */
543 ssize_t spk_msg_set(enum msg_index_t index, char *text, size_t length)
544 {
545 	char *newstr = NULL;
546 	unsigned long flags;
547 
548 	if ((index < MSG_FIRST_INDEX) || (index >= MSG_LAST_INDEX))
549 		return -EINVAL;
550 
551 	newstr = kmemdup_nul(text, length, GFP_KERNEL);
552 	if (!newstr)
553 		return -ENOMEM;
554 
555 	if (index >= MSG_FORMATTED_START &&
556 	    index <= MSG_FORMATTED_END &&
557 	    !fmt_validate(speakup_default_msgs[index], newstr)) {
558 		kfree(newstr);
559 		return -EINVAL;
560 	}
561 	spin_lock_irqsave(&speakup_info.spinlock, flags);
562 	if (speakup_msgs[index] != speakup_default_msgs[index])
563 		kfree(speakup_msgs[index]);
564 	speakup_msgs[index] = newstr;
565 	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
566 	return 0;
567 }
568 
569 /*
570  * Find a message group, given its name.  Return a pointer to the structure
571  * if found, or NULL otherwise.
572  */
573 struct msg_group_t *spk_find_msg_group(const char *group_name)
574 {
575 	struct msg_group_t *group = NULL;
576 	int i;
577 
578 	for (i = 0; i < num_groups; i++) {
579 		if (!strcmp(all_groups[i].name, group_name)) {
580 			group = &all_groups[i];
581 			break;
582 		}
583 	}
584 	return group;
585 }
586 
587 void spk_reset_msg_group(struct msg_group_t *group)
588 {
589 	unsigned long flags;
590 	enum msg_index_t i;
591 
592 	spin_lock_irqsave(&speakup_info.spinlock, flags);
593 
594 	for (i = group->start; i <= group->end; i++) {
595 		if (speakup_msgs[i] != speakup_default_msgs[i])
596 			kfree(speakup_msgs[i]);
597 		speakup_msgs[i] = speakup_default_msgs[i];
598 	}
599 	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
600 }
601 
602 /* Called at initialization time, to establish default messages. */
603 void spk_initialize_msgs(void)
604 {
605 	memcpy(speakup_msgs, speakup_default_msgs,
606 	       sizeof(speakup_default_msgs));
607 }
608 
609 /* Free user-supplied strings when module is unloaded: */
610 void spk_free_user_msgs(void)
611 {
612 	enum msg_index_t index;
613 	unsigned long flags;
614 
615 	spin_lock_irqsave(&speakup_info.spinlock, flags);
616 	for (index = MSG_FIRST_INDEX; index < MSG_LAST_INDEX; index++) {
617 		if (speakup_msgs[index] != speakup_default_msgs[index]) {
618 			kfree(speakup_msgs[index]);
619 			speakup_msgs[index] = speakup_default_msgs[index];
620 		}
621 	}
622 	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
623 }
624