Quelle  i18n.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Internationalization implementation.  Includes definitions of English
 * string arrays, and the i18n pointer.
 */

#include <linux/slab.h>  /* For kmalloc. */
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/string.h>
#include "speakup.h"
#include "spk_priv.h"

static char *speakup_msgs[MSG_LAST_INDEX];
static char *speakup_default_msgs[MSG_LAST_INDEX] = {
 [MSG_BLANK] = "blank",
 [MSG_IAM_ALIVE] = "I'm aLive!",
 [MSG_YOU_KILLED_SPEAKUP] = "You killed speakup!",
 [MSG_HEY_THATS_BETTER] = "hey. That's better!",
 [MSG_YOU_TURNED_ME_OFF] = "You turned me off!",
 [MSG_PARKED] = "parked!",
 [MSG_UNPARKED] = "unparked!",
 [MSG_MARK] = "mark",
 [MSG_CUT] = "cut",
 [MSG_MARK_CLEARED] = "mark, cleared",
 [MSG_PASTE] = "paste",
 [MSG_BRIGHT] = "bright",
 [MSG_ON_BLINKING] = "on blinking",
 [MSG_OFF] = "off",
 [MSG_ON] = "on",
 [MSG_NO_WINDOW] = "no window",
 [MSG_CURSORING_OFF] = "cursoring off",
 [MSG_CURSORING_ON] = "cursoring on",
 [MSG_HIGHLIGHT_TRACKING] = "highlight tracking",
 [MSG_READ_WINDOW] = "read windo",
 [MSG_READ_ALL] = "read all",
 [MSG_EDIT_DONE] = "edit done",
 [MSG_WINDOW_ALREADY_SET] = "window already set, clear then reset",
 [MSG_END_BEFORE_START] = "error end before start",
 [MSG_WINDOW_CLEARED] = "window cleared",
 [MSG_WINDOW_SILENCED] = "window silenced",
 [MSG_WINDOW_SILENCE_DISABLED] = "window silence disabled",
 [MSG_ERROR] = "error",
 [MSG_GOTO_CANCELED] = "goto canceled",
 [MSG_GOTO] = "go to?",
 [MSG_LEAVING_HELP] = "leaving help",
 [MSG_IS_UNASSIGNED] = "is unassigned",
 [MSG_HELP_INFO] =
 "press space to exit, up or down to scroll, or a letter to go to a command",
 [MSG_EDGE_TOP] = "top,",
 [MSG_EDGE_BOTTOM] = "bottom,",
 [MSG_EDGE_LEFT] = "left,",
 [MSG_EDGE_RIGHT] = "right,",
 [MSG_NUMBER] = "number",
 [MSG_SPACE] = "space",
 [MSG_START] = "start",
 [MSG_END] = "end",
 [MSG_CTRL] = "control-",
 [MSG_DISJUNCTION] = "or",

/* Messages with embedded format specifiers. */
 [MSG_POS_INFO] = "line %ld, col %ld, t t y %d",
 [MSG_CHAR_INFO] = "hex %02x, decimal %d",
 [MSG_REPEAT_DESC] = "times %d .",
 [MSG_REPEAT_DESC2] = "repeated %d .",
 [MSG_WINDOW_LINE] = "window is line %d",
 [MSG_WINDOW_BOUNDARY] = "%s at line %d, column %d",
 [MSG_EDIT_PROMPT] = "edit %s, press space when done",
 [MSG_NO_COMMAND] = "no commands for %c",
 [MSG_KEYDESC] = "is %s",

 /* Control keys. */
 /* Most of these duplicate the entries in state names. */
 [MSG_CTL_SHIFT] = "shift",
 [MSG_CTL_ALTGR] = "altgr",
 [MSG_CTL_CONTROL] = "control",
 [MSG_CTL_ALT] = "alt",
 [MSG_CTL_LSHIFT] = "l shift",
 [MSG_CTL_SPEAKUP] = "speakup",
 [MSG_CTL_LCONTROL] = "l control",
 [MSG_CTL_RCONTROL] = "r control",
 [MSG_CTL_CAPSSHIFT] = "caps shift",

 /* Color names. */
 [MSG_COLOR_BLACK] = "black",
 [MSG_COLOR_BLUE] = "blue",
 [MSG_COLOR_GREEN] = "green",
 [MSG_COLOR_CYAN] = "cyan",
 [MSG_COLOR_RED] = "red",
 [MSG_COLOR_MAGENTA] = "magenta",
 [MSG_COLOR_YELLOW] = "yellow",
 [MSG_COLOR_WHITE] = "white",
 [MSG_COLOR_GREY] = "grey",
 [MSG_COLOR_BRIGHTBLUE] = "bright blue",
 [MSG_COLOR_BRIGHTGREEN] = "bright green",
 [MSG_COLOR_BRIGHTCYAN] = "bright cyan",
 [MSG_COLOR_BRIGHTRED] = "bright red",
 [MSG_COLOR_BRIGHTMAGENTA] = "bright magenta",
 [MSG_COLOR_BRIGHTYELLOW] = "bright yellow",
 [MSG_COLOR_BRIGHTWHITE] = "bright white",

 /* Names of key states. */
 [MSG_STATE_DOUBLE] = "double",
 [MSG_STATE_SPEAKUP] = "speakup",
 [MSG_STATE_ALT] = "alt",
 [MSG_STATE_CONTROL] = "ctrl",
 [MSG_STATE_ALTGR] = "altgr",
 [MSG_STATE_SHIFT] = "shift",

 /* Key names. */
 [MSG_KEYNAME_ESC] = "escape",
 [MSG_KEYNAME_1] = "1",
 [MSG_KEYNAME_2] = "2",
 [MSG_KEYNAME_3] = "3",
 [MSG_KEYNAME_4] = "4",
 [MSG_KEYNAME_5] = "5",
 [MSG_KEYNAME_6] = "6",
 [MSG_KEYNAME_7] = "7",
 [MSG_KEYNAME_8] = "8",
 [MSG_KEYNAME_9] = "9",
 [MSG_KEYNAME_0] = "0",
 [MSG_KEYNAME_DASH] = "minus",
 [MSG_KEYNAME_EQUAL] = "equal",
 [MSG_KEYNAME_BS] = "back space",
 [MSG_KEYNAME_TAB] = "tab",
 [MSG_KEYNAME_Q] = "q",
 [MSG_KEYNAME_W] = "w",
 [MSG_KEYNAME_E] = "e",
 [MSG_KEYNAME_R] = "r",
 [MSG_KEYNAME_T] = "t",
 [MSG_KEYNAME_Y] = "y",
 [MSG_KEYNAME_U] = "u",
 [MSG_KEYNAME_I] = "i",
 [MSG_KEYNAME_O] = "o",
 [MSG_KEYNAME_P] = "p",
 [MSG_KEYNAME_LEFTBRACE] = "left brace",
 [MSG_KEYNAME_RIGHTBRACE] = "right brace",
 [MSG_KEYNAME_ENTER] = "enter",
 [MSG_KEYNAME_LEFTCTRL] = "left control",
 [MSG_KEYNAME_A] = "a",
 [MSG_KEYNAME_S] = "s",
 [MSG_KEYNAME_D] = "d",
 [MSG_KEYNAME_F] = "f",
 [MSG_KEYNAME_G] = "g",
 [MSG_KEYNAME_H] = "h",
 [MSG_KEYNAME_J] = "j",
 [MSG_KEYNAME_K] = "k",
 [MSG_KEYNAME_L] = "l",
 [MSG_KEYNAME_SEMICOLON] = "semicolon",
 [MSG_KEYNAME_SINGLEQUOTE] = "apostrophe",
 [MSG_KEYNAME_GRAVE] = "accent",
 [MSG_KEYNAME_LEFTSHFT] = "left shift",
 [MSG_KEYNAME_BACKSLASH] = "back slash",
 [MSG_KEYNAME_Z] = "z",
 [MSG_KEYNAME_X] = "x",
 [MSG_KEYNAME_C] = "c",
 [MSG_KEYNAME_V] = "v",
 [MSG_KEYNAME_B] = "b",
 [MSG_KEYNAME_N] = "n",
 [MSG_KEYNAME_M] = "m",
 [MSG_KEYNAME_COMMA] = "comma",
 [MSG_KEYNAME_DOT] = "dot",
 [MSG_KEYNAME_SLASH] = "slash",
 [MSG_KEYNAME_RIGHTSHFT] = "right shift",
 [MSG_KEYNAME_KPSTAR] = "keypad asterisk",
 [MSG_KEYNAME_LEFTALT] = "left alt",
 [MSG_KEYNAME_SPACE] = "space",
 [MSG_KEYNAME_CAPSLOCK] = "caps lock",
 [MSG_KEYNAME_F1] = "f1",
 [MSG_KEYNAME_F2] = "f2",
 [MSG_KEYNAME_F3] = "f3",
 [MSG_KEYNAME_F4] = "f4",
 [MSG_KEYNAME_F5] = "f5",
 [MSG_KEYNAME_F6] = "f6",
 [MSG_KEYNAME_F7] = "f7",
 [MSG_KEYNAME_F8] = "f8",
 [MSG_KEYNAME_F9] = "f9",
 [MSG_KEYNAME_F10] = "f10",
 [MSG_KEYNAME_NUMLOCK] = "num lock",
 [MSG_KEYNAME_SCROLLLOCK] = "scroll lock",
 [MSG_KEYNAME_KP7] = "keypad 7",
 [MSG_KEYNAME_KP8] = "keypad 8",
 [MSG_KEYNAME_KP9] = "keypad 9",
 [MSG_KEYNAME_KPMINUS] = "keypad minus",
 [MSG_KEYNAME_KP4] = "keypad 4",
 [MSG_KEYNAME_KP5] = "keypad 5",
 [MSG_KEYNAME_KP6] = "keypad 6",
 [MSG_KEYNAME_KPPLUS] = "keypad plus",
 [MSG_KEYNAME_KP1] = "keypad 1",
 [MSG_KEYNAME_KP2] = "keypad 2",
 [MSG_KEYNAME_KP3] = "keypad 3",
 [MSG_KEYNAME_KP0] = "keypad 0",
 [MSG_KEYNAME_KPDOT] = "keypad dot",
 [MSG_KEYNAME_103RD] = "103rd",
 [MSG_KEYNAME_F13] = "f13",
 [MSG_KEYNAME_102ND] = "102nd",
 [MSG_KEYNAME_F11] = "f11",
 [MSG_KEYNAME_F12] = "f12",
 [MSG_KEYNAME_F14] = "f14",
 [MSG_KEYNAME_F15] = "f15",
 [MSG_KEYNAME_F16] = "f16",
 [MSG_KEYNAME_F17] = "f17",
 [MSG_KEYNAME_F18] = "f18",
 [MSG_KEYNAME_F19] = "f19",
 [MSG_KEYNAME_F20] = "f20",
 [MSG_KEYNAME_KPENTER] = "keypad enter",
 [MSG_KEYNAME_RIGHTCTRL] = "right control",
 [MSG_KEYNAME_KPSLASH] = "keypad slash",
 [MSG_KEYNAME_SYSRQ] = "sysrq",
 [MSG_KEYNAME_RIGHTALT] = "right alt",
 [MSG_KEYNAME_LF] = "line feed",
 [MSG_KEYNAME_HOME] = "home",
 [MSG_KEYNAME_UP] = "up",
 [MSG_KEYNAME_PGUP] = "page up",
 [MSG_KEYNAME_LEFT] = "left",
 [MSG_KEYNAME_RIGHT] = "right",
 [MSG_KEYNAME_END] = "end",
 [MSG_KEYNAME_DOWN] = "down",
 [MSG_KEYNAME_PGDN] = "page down",
 [MSG_KEYNAME_INS] = "insert",
 [MSG_KEYNAME_DEL] = "delete",
 [MSG_KEYNAME_MACRO] = "macro",
 [MSG_KEYNAME_MUTE] = "mute",
 [MSG_KEYNAME_VOLDOWN] = "volume down",
 [MSG_KEYNAME_VOLUP] = "volume up",
 [MSG_KEYNAME_POWER] = "power",
 [MSG_KEYNAME_KPEQUAL] = "keypad equal",
 [MSG_KEYNAME_KPPLUSDASH] = "keypad plusminus",
 [MSG_KEYNAME_PAUSE] = "pause",
 [MSG_KEYNAME_F21] = "f21",
 [MSG_KEYNAME_F22] = "f22",
 [MSG_KEYNAME_F23] = "f23",
 [MSG_KEYNAME_F24] = "f24",
 [MSG_KEYNAME_KPCOMMA] = "keypad comma",
 [MSG_KEYNAME_LEFTMETA] = "left meta",
 [MSG_KEYNAME_RIGHTMETA] = "right meta",
 [MSG_KEYNAME_COMPOSE] = "compose",
 [MSG_KEYNAME_STOP] = "stop",
 [MSG_KEYNAME_AGAIN] = "again",
 [MSG_KEYNAME_PROPS] = "props",
 [MSG_KEYNAME_UNDO] = "undo",
 [MSG_KEYNAME_FRONT] = "front",
 [MSG_KEYNAME_COPY] = "copy",
 [MSG_KEYNAME_OPEN] = "open",
 [MSG_KEYNAME_PASTE] = "paste",
 [MSG_KEYNAME_FIND] = "find",
 [MSG_KEYNAME_CUT] = "cut",
 [MSG_KEYNAME_HELP] = "help",
 [MSG_KEYNAME_MENU] = "menu",
 [MSG_KEYNAME_CALC] = "calc",
 [MSG_KEYNAME_SETUP] = "setup",
 [MSG_KEYNAME_SLEEP] = "sleep",
 [MSG_KEYNAME_WAKEUP] = "wakeup",
 [MSG_KEYNAME_FILE] = "file",
 [MSG_KEYNAME_SENDFILE] = "send file",
 [MSG_KEYNAME_DELFILE] = "delete file",
 [MSG_KEYNAME_XFER] = "transfer",
 [MSG_KEYNAME_PROG1] = "prog1",
 [MSG_KEYNAME_PROG2] = "prog2",
 [MSG_KEYNAME_WWW] = "www",
 [MSG_KEYNAME_MSDOS] = "msdos",
 [MSG_KEYNAME_COFFEE] = "coffee",
 [MSG_KEYNAME_DIRECTION] = "direction",
 [MSG_KEYNAME_CYCLEWINDOWS] = "cycle windows",
 [MSG_KEYNAME_MAIL] = "mail",
 [MSG_KEYNAME_BOOKMARKS] = "bookmarks",
 [MSG_KEYNAME_COMPUTER] = "computer",
 [MSG_KEYNAME_BACK] = "back",
 [MSG_KEYNAME_FORWARD] = "forward",
 [MSG_KEYNAME_CLOSECD] = "close cd",
 [MSG_KEYNAME_EJECTCD] = "eject cd",
 [MSG_KEYNAME_EJECTCLOSE] = "eject close cd",
 [MSG_KEYNAME_NEXTSONG] = "next song",
 [MSG_KEYNAME_PLAYPAUSE] = "play pause",
 [MSG_KEYNAME_PREVSONG] = "previous song",
 [MSG_KEYNAME_STOPCD] = "stop cd",
 [MSG_KEYNAME_RECORD] = "record",
 [MSG_KEYNAME_REWIND] = "rewind",
 [MSG_KEYNAME_PHONE] = "phone",
 [MSG_KEYNAME_ISO] = "iso",
 [MSG_KEYNAME_CONFIG] = "config",
 [MSG_KEYNAME_HOMEPG] = "home page",
 [MSG_KEYNAME_REFRESH] = "refresh",
 [MSG_KEYNAME_EXIT] = "exit",
 [MSG_KEYNAME_MOVE] = "move",
 [MSG_KEYNAME_EDIT] = "edit",
 [MSG_KEYNAME_SCROLLUP] = "scroll up",
 [MSG_KEYNAME_SCROLLDN] = "scroll down",
 [MSG_KEYNAME_KPLEFTPAR] = "keypad left paren",
 [MSG_KEYNAME_KPRIGHTPAR] = "keypad right paren",

 /* Function names. */
 [MSG_FUNCNAME_ATTRIB_BLEEP_DEC] = "attribute bleep decrement",
 [MSG_FUNCNAME_ATTRIB_BLEEP_INC] = "attribute bleep increment",
 [MSG_FUNCNAME_BLEEPS_DEC] = "bleeps decrement",
 [MSG_FUNCNAME_BLEEPS_INC] = "bleeps increment",
 [MSG_FUNCNAME_CHAR_FIRST] = "character, first",
 [MSG_FUNCNAME_CHAR_LAST] = "character, last",
 [MSG_FUNCNAME_CHAR_CURRENT] = "character, say current",
 [MSG_FUNCNAME_CHAR_HEX_AND_DEC] = "character, say hex and decimal",
 [MSG_FUNCNAME_CHAR_NEXT] = "character, say next",
 [MSG_FUNCNAME_CHAR_PHONETIC] = "character, say phonetic",
 [MSG_FUNCNAME_CHAR_PREVIOUS] = "character, say previous",
 [MSG_FUNCNAME_CURSOR_PARK] = "cursor park",
 [MSG_FUNCNAME_CUT] = "cut",
 [MSG_FUNCNAME_EDIT_DELIM] = "edit delimiters",
 [MSG_FUNCNAME_EDIT_EXNUM] = "edit exnum",
 [MSG_FUNCNAME_EDIT_MOST] = "edit most",
 [MSG_FUNCNAME_EDIT_REPEATS] = "edit repeats",
 [MSG_FUNCNAME_EDIT_SOME] = "edit some",
 [MSG_FUNCNAME_GOTO] = "go to",
 [MSG_FUNCNAME_GOTO_BOTTOM] = "go to bottom edge",
 [MSG_FUNCNAME_GOTO_LEFT] = "go to left edge",
 [MSG_FUNCNAME_GOTO_RIGHT] = "go to right edge",
 [MSG_FUNCNAME_GOTO_TOP] = "go to top edge",
 [MSG_FUNCNAME_HELP] = "help",
 [MSG_FUNCNAME_LINE_SAY_CURRENT] = "line, say current",
 [MSG_FUNCNAME_LINE_SAY_NEXT] = "line, say next",
 [MSG_FUNCNAME_LINE_SAY_PREVIOUS] = "line, say previous",
 [MSG_FUNCNAME_LINE_SAY_WITH_INDENT] = "line, say with indent",
 [MSG_FUNCNAME_PASTE] = "paste",
 [MSG_FUNCNAME_PITCH_DEC] = "pitch decrement",
 [MSG_FUNCNAME_PITCH_INC] = "pitch increment",
 [MSG_FUNCNAME_PUNC_DEC] = "punctuation decrement",
 [MSG_FUNCNAME_PUNC_INC] = "punctuation increment",
 [MSG_FUNCNAME_PUNC_LEVEL_DEC] = "punc level decrement",
 [MSG_FUNCNAME_PUNC_LEVEL_INC] = "punc level increment",
 [MSG_FUNCNAME_QUIET] = "quiet",
 [MSG_FUNCNAME_RATE_DEC] = "rate decrement",
 [MSG_FUNCNAME_RATE_INC] = "rate increment",
 [MSG_FUNCNAME_READING_PUNC_DEC] = "reading punctuation decrement",
 [MSG_FUNCNAME_READING_PUNC_INC] = "reading punctuation increment",
 [MSG_FUNCNAME_SAY_ATTRIBUTES] = "say attributes",
 [MSG_FUNCNAME_SAY_FROM_LEFT] = "say from left",
 [MSG_FUNCNAME_SAY_FROM_TOP] = "say from top",
 [MSG_FUNCNAME_SAY_POSITION] = "say position",
 [MSG_FUNCNAME_SAY_SCREEN] = "say screen",
 [MSG_FUNCNAME_SAY_TO_BOTTOM] = "say to bottom",
 [MSG_FUNCNAME_SAY_TO_RIGHT] = "say to right",
 [MSG_FUNCNAME_SPEAKUP] = "speakup",
 [MSG_FUNCNAME_SPEAKUP_LOCK] = "speakup lock",
 [MSG_FUNCNAME_SPEAKUP_OFF] = "speakup off",
 [MSG_FUNCNAME_SPEECH_KILL] = "speech kill",
 [MSG_FUNCNAME_SPELL_DELAY_DEC] = "spell delay decrement",
 [MSG_FUNCNAME_SPELL_DELAY_INC] = "spell delay increment",
 [MSG_FUNCNAME_SPELL_WORD] = "spell word",
 [MSG_FUNCNAME_SPELL_WORD_PHONETICALLY] = "spell word phonetically",
 [MSG_FUNCNAME_TONE_DEC] = "tone decrement",
 [MSG_FUNCNAME_TONE_INC] = "tone increment",
 [MSG_FUNCNAME_VOICE_DEC] = "voice decrement",
 [MSG_FUNCNAME_VOICE_INC] = "voice increment",
 [MSG_FUNCNAME_VOLUME_DEC] = "volume decrement",
 [MSG_FUNCNAME_VOLUME_INC] = "volume increment",
 [MSG_FUNCNAME_WINDOW_CLEAR] = "window, clear",
 [MSG_FUNCNAME_WINDOW_SAY] = "window, say",
 [MSG_FUNCNAME_WINDOW_SET] = "window, set",
 [MSG_FUNCNAME_WINDOW_SILENCE] = "window, silence",
 [MSG_FUNCNAME_WORD_SAY_CURRENT] = "word, say current",
 [MSG_FUNCNAME_WORD_SAY_NEXT] = "word, say next",
 [MSG_FUNCNAME_WORD_SAY_PREVIOUS] = "word, say previous",
};

static struct msg_group_t all_groups[] = {
 {
  .name = "ctl_keys",
  .start = MSG_CTL_START,
  .end = MSG_CTL_END,
 },
 {
  .name = "colors",
  .start = MSG_COLORS_START,
  .end = MSG_COLORS_END,
 },
 {
  .name = "formatted",
  .start = MSG_FORMATTED_START,
  .end = MSG_FORMATTED_END,
 },
 {
  .name = "function_names",
  .start = MSG_FUNCNAMES_START,
  .end = MSG_FUNCNAMES_END,
 },
 {
  .name = "key_names",
  .start = MSG_KEYNAMES_START,
  .end = MSG_KEYNAMES_END,
 },
 {
  .name = "announcements",
  .start = MSG_ANNOUNCEMENTS_START,
  .end = MSG_ANNOUNCEMENTS_END,
 },
 {
  .name = "states",
  .start = MSG_STATES_START,
  .end = MSG_STATES_END,
 },
};

static const  int num_groups = ARRAY_SIZE(all_groups);

char *spk_msg_get(enum msg_index_t index)
{
 return speakup_msgs[index];
}

/*
 * Function: next_specifier
 * Finds the start of the next format specifier in the argument string.
 * Return value: pointer to start of format
 * specifier, or NULL if no specifier exists.
 */
static char *next_specifier(char *input)
{
 int found = 0;
 char *next_percent = input;

 while (next_percent && !found) {
  next_percent = strchr(next_percent, '%');
  if (next_percent) {
   /* skip over doubled percent signs */
   while (next_percent[0] == '%' &&
          next_percent[1] == '%')
    next_percent += 2;
   if (*next_percent == '%')
    found = 1;
   else if (*next_percent == '\0')
    next_percent = NULL;
  }
 }

 return next_percent;
}

/* Skip over 0 or more flags. */
static char *skip_flags(char *input)
{
 while ((*input != '\0') && strchr(" 0+-#", *input))
  input++;
 return input;
}

/* Skip over width.precision, if it exists. */
static char *skip_width(char *input)
{
 while (isdigit(*input))
  input++;
 if (*input == '.') {
  input++;
  while (isdigit(*input))
   input++;
 }
 return input;
}

/*
 * Skip past the end of the conversion part.
 * Note that this code only accepts a handful of conversion specifiers:
 * c d s x and ld.  Not accidental; these are exactly the ones used in
 * the default group of formatted messages.
 */
static char *skip_conversion(char *input)
{
 if ((input[0] == 'l') && (input[1] == 'd'))
  input += 2;
 else if ((*input != '\0') && strchr("cdsx", *input))
  input++;
 return input;
}

/*
 * Function: find_specifier_end
 * Return a pointer to the end of the format specifier.
 */
static char *find_specifier_end(char *input)
{
 input++;  /* Advance over %. */
 input = skip_flags(input);
 input = skip_width(input);
 input = skip_conversion(input);
 return input;
}

/*
 * Function: compare_specifiers
 * Compare the format specifiers pointed to by *input1 and *input2.
 * Return true if they are the same, false otherwise.
 * Advance *input1 and *input2 so that they point to the character following
 * the end of the specifier.
 */
static bool compare_specifiers(char **input1, char **input2)
{
 bool same = false;
 char *end1 = find_specifier_end(*input1);
 char *end2 = find_specifier_end(*input2);
 size_t length1 = end1 - *input1;
 size_t length2 = end2 - *input2;

 if ((length1 == length2) && !memcmp(*input1, *input2, length1))
  same = true;

 *input1 = end1;
 *input2 = end2;
 return same;
}

/*
 * Function: fmt_validate
 * Check that two format strings contain the same number of format specifiers,
 * and that the order of specifiers is the same in both strings.
 * Return true if the condition holds, false if it doesn't.
 */
static bool fmt_validate(char *template, char *user)
{
 bool valid = true;
 bool still_comparing = true;
 char *template_ptr = template;
 char *user_ptr = user;

 while (still_comparing && valid) {
  template_ptr = next_specifier(template_ptr);
  user_ptr = next_specifier(user_ptr);
  if (template_ptr && user_ptr) {
   /* Both have at least one more specifier. */
   valid = compare_specifiers(&template_ptr, &user_ptr);
  } else {
   /* No more format specifiers in one or both strings. */
   still_comparing = false;
   /* See if one has more specifiers than the other. */
   if (template_ptr || user_ptr)
    valid = false;
  }
 }
 return valid;
}

/*
 * Function: msg_set
 * Description: Add a user-supplied message to the user_messages array.
 * The message text is copied to a memory area allocated with kmalloc.
 * If the function fails, then user_messages is untouched.
 * Arguments:
 * - index: a message number, as found in i18n.h.
 * - text:  text of message.  Not NUL-terminated.
 * - length: number of bytes in text.
 * Failure conditions:
 * -EINVAL -  Invalid format specifiers in formatted message or illegal index.
 * -ENOMEM -  Unable to allocate memory.
 */
ssize_t spk_msg_set(enum msg_index_t index, char *text, size_t length)
{
 char *newstr = NULL;
 unsigned long flags;

 if ((index < MSG_FIRST_INDEX) || (index >= MSG_LAST_INDEX))
  return -EINVAL;

 newstr = kmemdup_nul(text, length, GFP_KERNEL);
 if (!newstr)
  return -ENOMEM;

 if (index >= MSG_FORMATTED_START &&
     index <= MSG_FORMATTED_END &&
     !fmt_validate(speakup_default_msgs[index], newstr)) {
  kfree(newstr);
  return -EINVAL;
 }
 spin_lock_irqsave(&speakup_info.spinlock, flags);
 if (speakup_msgs[index] != speakup_default_msgs[index])
  kfree(speakup_msgs[index]);
 speakup_msgs[index] = newstr;
 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 return 0;
}

/*
 * Find a message group, given its name.  Return a pointer to the structure
 * if found, or NULL otherwise.
 */
struct msg_group_t *spk_find_msg_group(const char *group_name)
{
 struct msg_group_t *group = NULL;
 int i;

 for (i = 0; i < num_groups; i++) {
  if (!strcmp(all_groups[i].name, group_name)) {
   group = &all_groups[i];
   break;
  }
 }
 return group;
}

void spk_reset_msg_group(struct msg_group_t *group)
{
 unsigned long flags;
 enum msg_index_t i;

 spin_lock_irqsave(&speakup_info.spinlock, flags);

 for (i = group->start; i <= group->end; i++) {
  if (speakup_msgs[i] != speakup_default_msgs[i])
   kfree(speakup_msgs[i]);
  speakup_msgs[i] = speakup_default_msgs[i];
 }
 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
}

/* Called at initialization time, to establish default messages. */
void spk_initialize_msgs(void)
{
 memcpy(speakup_msgs, speakup_default_msgs,
        sizeof(speakup_default_msgs));
}

/* Free user-supplied strings when module is unloaded: */
void spk_free_user_msgs(void)
{
 enum msg_index_t index;
 unsigned long flags;

 spin_lock_irqsave(&speakup_info.spinlock, flags);
 for (index = MSG_FIRST_INDEX; index < MSG_LAST_INDEX; index++) {
  if (speakup_msgs[index] != speakup_default_msgs[index]) {
   kfree(speakup_msgs[index]);
   speakup_msgs[index] = speakup_default_msgs[index];
  }
 }
 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
}