/* $Id$ */
/**
 * edit.c, 用來提供 bbs上的文字編輯器, 即 ve.
 * 現在這一個是惡搞過的版本, 比較不穩定, 用比較多的 cpu, 但是可以省下許多
 * 的記憶體 (以 Ptt為例, 在九千人上站的時候, 約可省下 50MB 的記憶體)
 * 如果您認為「拿 cpu換記憶體」並不合乎您的須求, 您可以考慮改使用修正前的
 * 版本 (Revision 782)
 *
 * 原本 ve 的做法是, 因為每一行最大可以輸入 WRAPMARGIN 個字, 於是就替每一
 * 行保留了 WRAPMARGIN 這麼大的空間 (約 512 bytes) . 但是實際上, 站在修正
 * 成本最小的考量上, 我們只須要使得游標所在這一行維持 WRAPMARGIN 這麼大,
 * 其他每一行其實不須要這麼多的空間. 於是這個 patch就在每次游標在行間移動
 * 的時候, 將原本的那行記憶體縮小, 再將新移到的那行重新加大, 以達成最小的
 * 記憶體用量.
 * 以上說的這個動作在 adjustline() 中完成, adjustline()另外包括修正數個
 * global pointer, 以避免 dangling pointer . 
 * 另外若定義 DEBUG, 在 textline_t 結構中將加入 mlength, 表示該行實際佔的
 * 記憶體大小. 以方便測試結果.
 * 這個版本似乎還有地方沒有修正好, 可能導致 segmentation fault .
 */
#include "bbs.h"

#if 0
#define register 
#define DEBUG
#define inline 
#endif

/**
 * data 欄位的用法:
 * 每次 allocate 一個 textline_t 時，會配給他 (sizeof(textline_t) + string
 * length - 1) 的大小。如此可直接存取 data 而不需額外的 malloc。
 */
typedef struct textline_t {
    struct textline_t *prev;
    struct textline_t *next;
    short           len;
#ifdef DEBUG
    short           mlength;
#endif
    char            data[1];
}               textline_t;

#define KEEP_EDITING    -2

enum {
    NOBODY, MANAGER, SYSOP
};


/**
 * 這個說明會將整個 edit.c 運作的概念帶過，主要會從 editor_internal_t 的
 * data structure 談起。對於每一個 data member 的詳細功能，請見 sturcture
 * 中的註解。
 *
 * 文章的內容 (以下稱 content) 以「行」為單位，主要以 firstline, lastline,
 * totaln 來記錄。
 * 
 * User 在畫面中看到的畫面，置於一個「 window 」中，這個 window 會在
 * content 上移動，window 裡面的範圍即為要 show 出來的範圍。它用了不少
 * 欄位來記錄，包括 currline, top_of_win, currln, currpnt, curr_window_line,
 * edit_margin。顯示出來的效果當然不只是靠這幾個資料，還會跟其他欄位有交互
 * 作用，例如 彩色編輯模式、特殊符號編輯 等等。其中最複雜的部分是在選取 block
 * （見後）的時候。比較不直覺的行為是：除非游標在開始選取跟目前（結束）的位置
 * 是同一個（此時這個範圍是選取的範圍），否則就是從開始那一列一直到目前（結束）
 * 這一列。
 *
 * editor 的使用上目前有五種 inclusive 的 mode：
 *   insert mode:
 *     插入/取代
 *   ansi mode:
 *     彩色編輯
 *   indent mode:
 *     自動縮排
 *   phone mode:
 *     特殊符號編輯
 *   raw mode:
 *     ignore Ctrl('S'), Ctrl('Q'), Ctrl('T')
 *     贊曰: 這有什麼用? 看起來是 modem 上傳用 (沒人在用這個了吧)
 *     拿來當 dbcs option 吧
 *
 * editor 支援了區塊選擇的功能（多行選取 或 單行中的片段），對於一個 selected
 * block，可以 cut, copy, cancel, 或者存到暫取檔，甚至是往左/右 shift。詳見
 * block_XXX。
 *
 * 用 Ctrl('Y') 刪除的那一行會被記到 deleted_line 這個欄位中。undelete_line()
 * 可以做 undelete 的動作。 deleted_line 初始值為 NULL，每次只允許存一行，所以
 * 在存下來時，發現值不為 NULL 會先做 free 的動作。editor 結束時，在
 * edit_buffer_destructor() 中如果發現有 deleted_line，會在這邊釋放掉。其他地
 * 方也有相同的作法，例如 searched_string。searched_string 是在搜尋文章內容
 * 時，要尋找的 key word。
 *
 * 還有一個有趣的特點，「括號匹配」！行為就如同在 vim 裡面一樣。呃，當然沒那
 * 麼強啦，但至少在含有 c-style comment 跟 c-style string 時是對的喔。這個動
 * 作定義於 match_paren() 中。
 *
 * 另外，如果有需要新增新的欄位，請將初始化（有需要的話）的動作寫在
 * edit_buffer_constructor 中。當然也有個 edit_buffer_destructor 可以使用。
 *
 * 此外，為了提供一個 reentrant 的 editor，prev 指向前一個 editor 的
 * editor_internal_t。enter_edit_buffer 跟 exit_edit_buffer 提供進出的介面，
 * 裡面分別會呼叫 constructor 跟 destructor。
 *
 * TODO
 * vedit 裡面有個 curr_buf->oldcurrline，用來記上一次的 currline。由於只有 currline 擁
 * 有 WRAPMARGIN 的空間，所以目前的作法是當 curr_buf->oldcurrline != currline 時，就
 * resize curr_buf->oldcurrline 跟 currline。但是糟糕的是目前必須人工追蹤 currline 的行
 * 為，而且若不幸遇到 curr_buf->oldcurrline 指到的那一行已經被 free 掉，就完了。最好是
 * 把這些東西包起來。不過我沒空做了，patch is welcome :P
 *
 * Victor Hsieh <victor@csie.org>
 * Thu, 03 Feb 2005 15:18:00 +0800
 */
typedef struct editor_internal_t {

    textline_t *firstline;	/* first line of the article. */
    textline_t *lastline;	/* last line of the article. */

    textline_t *currline;	/* current line of the article(window). */
    textline_t *blockline;	/* the first selected line of the block. */
    textline_t *top_of_win;	/* top line of the article in the window. */

    textline_t *deleted_line;	/* deleted line. Just keep one deleted line. */
    textline_t *oldcurrline;

    short currln;		/* current line of the article. */
    short currpnt;		/* current column of the article. */
    short totaln;		/* total lines of the article. */
    short curr_window_line;	/* current line to the window. */
    short last_margin;
    short edit_margin;		/* when the cursor moves out of range (say,
				   t_columns), shift this length of the string
				   so you won't see the first edit_margin-th
				   character. */
    short lastindent;
    short blockln;		/* the row you started to select block. */
    short blockpnt;		/* the column you started to select block. */
    char insert_c;		/* insert this character when shift something
				   in order to compensate the new space. */
    char last_phone_mode;

    char ifuseanony		:1;
    char redraw_everything	:1;

    char insert_mode		:1;
    char ansimode		:1;
    char indent_mode		:1;
    char phone_mode		:1;
    char raw_mode		:1;

    char *searched_string;
    char *(*substr_fp) ();

    struct editor_internal_t *prev;

} editor_internal_t;
// } __attribute__ ((packed))

static editor_internal_t *curr_buf = NULL;

static const char fp_bak[] = "bak";

static const char * const BIG5[13] = {
  "，；：、﹑。？！‧﹗（）〝〞‵′",
  "▁▂▃▄▅▆▇█▏▎▍▌▋▊▉￭ ",
  "○⊙◎●☆★□■▼▲▽△◇◆♀♂",
  "﹌﹏\︴¯＿—∥∣▕／＼╳╱╲∕﹨",
  "＋－×÷√±＝≡≠≒≦≧＜＞∵∴",
  "∞～∩∪∫∮＆⊥∠∟⊿﹢﹣﹤﹥﹦",
  "↑↓←→↖↗↙↘",
  "【】「」『』〈〉《》〔〕｛｝︵︶",
  "︹︺︷︸︻︼︿﹀︽︾﹁﹂﹃﹄",
  "◢◣◥◤﹡＊※§＠⊕㊣…‥﹉﹍",
  "α\βγδεζηθικλμνξοπ",
  "ρστυφχψωΔΘΛΠΣΦΨΩ",
  "ⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩ"
};

static const char * const BIG_mode[13] = {
  "標點",
  "圖塊",
  "標記",
  "標線",
  "數一",
  "數二",
  "箭頭",
  "括一",
  "括二",
  "其他",
  "希一",
  "希二",
  "數字"
};

static const char *table[8] = {
  "│─└┴┘├┼┤┌┬┐",
  "║═╚╩╝╠╬╣╔╦╗",
  "║─╙╨╜╟╫╢╓╥╖",
  "│═╘╧╛╞╪╡╒╤╕",
  "│─╰┴╯├┼┤╭┬╮",
  "║═╰╩╯╠╬╣╭╦╮",
  "║─╙╨╜╟╫╢╓╥╖",
  "│═╘╧╛╞╪╡╒╤╕"
};

static const char *table_mode[6] = {
  "直角",
  "彎弧",
  "┼",
  "╬",
  "╫",
  "╪"
};

#ifdef DBCSAWARE_EDIT
static char mbcs_mode		=1;

#define IS_BIG5_HI(x) (0x81 <= (x) && (x) <= 0xfe)
#define IS_BIG5_LOS(x) (0x40 <= (x) && (x) <= 0x7e)
#define IS_BIG5_LOE(x) (0x80 <= (x) && (x) <= 0xfe)
#define IS_BIG5_LO(x) (IS_BIG5_LOS(x) || IS_BIG5_LOE(x))
#define IS_BIG5(hi,lo) (IS_BIG5_HI(hi) && IS_BIG5_LO(lo))
 
int mchar_len(unsigned char *str)
{
  return ((str[0] != '\0' && str[1] != '\0' && IS_BIG5(str[0], str[1])) ?
            2 :
            1);
}

#define FC_RIGHT (0)
#define FC_LEFT (~FC_RIGHT)

int fix_cursor(char *str, int pos, unsigned int dir)
{ 
  int newpos, w;
  
  for(newpos = 0;
      *str != '\0' &&
        (w = mchar_len(str),                               
         newpos + 1 + (dir & (w - 1))) <= pos;
      str += w, newpos += w)
    ;

  return newpos;
}

#endif


/* 記憶體管理與編輯處理 */
static void
indigestion(int i)
{
    vmsg("嚴重內傷 (%d)\n", i);
    u_exit("EDITOR FAILED");
    exit(0);
}

static inline void
edit_buffer_constructor(editor_internal_t *buf)
{
    /* all unspecified columns are 0 */
    buf->blockln = -1;
    buf->insert_c = ' ';
    buf->insert_mode = 1;
    buf->redraw_everything = 1;
    buf->lastindent = -1;
}

static inline void
enter_edit_buffer(void)
{
    editor_internal_t *p = curr_buf;
    curr_buf = (editor_internal_t *)malloc(sizeof(editor_internal_t));
    memset(curr_buf, 0, sizeof(editor_internal_t));
    curr_buf->prev = p;
    edit_buffer_constructor(curr_buf);
}

static inline void
edit_buffer_destructor(void)
{
    if (curr_buf->deleted_line != NULL)
	free(curr_buf->deleted_line);

    if (curr_buf->searched_string != NULL)
	free(curr_buf->searched_string);
}

static inline void
exit_edit_buffer(void)
{
    editor_internal_t *p = curr_buf;

    edit_buffer_destructor();
    curr_buf = p->prev;
    free(p);
}

/**
 * transform position ansix in an ansi string of textline_t to the same
 * string without escape code.
 * @return position in the string without escape code.
 */
static int
ansi2n(int ansix, textline_t * line)
{
    register char  *data, *tmp;
    register char   ch;

    data = tmp = line->data;

    while (*tmp) {
	if (*tmp == KEY_ESC) {
	    while ((ch = *tmp) && !isalpha((int)ch))
		tmp++;
	    if (ch)
		tmp++;
	    continue;
	}
	if (ansix <= 0)
	    break;
	tmp++;
	ansix--;
    }
    return tmp - data;
}

/**
 * opposite to ansi2n, according to given textline_t.
 * @return position in the string with escape code.
 */
static short
n2ansi(short nx, textline_t * line)
{
    register short  ansix = 0;
    register char  *tmp, *nxp;
    register char   ch;

    tmp = nxp = line->data;
    nxp += nx;

    while (*tmp) {
	if (*tmp == KEY_ESC) {
	    while ((ch = *tmp) && !isalpha((int)ch))
		tmp++;
	    if (ch)
		tmp++;
	    continue;
	}
	if (tmp >= nxp)
	    break;
	tmp++;
	ansix++;
    }
    return ansix;
}

/* 螢幕處理：輔助訊息、顯示編輯內容 */

static inline void
show_phone_mode_panel(void)
{
    int i;

    move(b_lines - 1, 0);
    clrtoeol();

    if (curr_buf->last_phone_mode < 20) {
	int len;
	prints(ANSI_COLOR(1;46) "【%s輸入】 ", BIG_mode[curr_buf->last_phone_mode - 1]);
	len = strlen(BIG5[curr_buf->last_phone_mode - 1]) / 2;
	for (i = 0; i < len; i++)
	    prints(ANSI_COLOR(37) "%c" ANSI_COLOR(34) "%2.2s", 
		    i + 'A', BIG5[curr_buf->last_phone_mode - 1] + i * 2);
	for (i = 0; i < 16 - len; i++)
	    outs("   ");
	outs(ANSI_COLOR(37) " `1~9-=切換 Z表格" ANSI_RESET);
    }
    else {
	prints(ANSI_COLOR(1;46) "【表格繪製】 /=%s *=%s形   ",
		table_mode[(curr_buf->last_phone_mode - 20) / 4], 
		table_mode[(curr_buf->last_phone_mode - 20) % 4 + 2]);
	for (i = 0;i < 11;i++)
	    prints(ANSI_COLOR(37) "%c" ANSI_COLOR(34) "%2.2s", i ? i + '/' : '.', 
		    table[curr_buf->last_phone_mode - 20] + i * 2);
	outs(ANSI_COLOR(37) "          Z內碼 " ANSI_RESET);
    }
}

/**
 * Show the bottom status/help bar, and BIG5/table in phone_mode.
 */
static void
edit_msg(void)
{
    int n = curr_buf->currpnt;

    if (curr_buf->ansimode)		/* Thor: 作 ansi 編輯 */
	n = n2ansi(n, curr_buf->currline);
 
    if (curr_buf->phone_mode)
	show_phone_mode_panel();

    move(b_lines, 0);
    clrtoeol();
    prints( ANSI_COLOR(37;44) " 編輯文章 " 
	    ANSI_COLOR(31;47) " (^Z/F1)" ANSI_COLOR(30) "說明 "
	    ANSI_COLOR(31;47) "(^P/^G)" ANSI_COLOR(30) "插入符號/圖片 "
	    ANSI_COLOR(31) "(^X/^Q)" ANSI_COLOR(30) "離開"
	    "║%s│%c%c%c%c║ %3d:%3d " ANSI_RESET,
	    curr_buf->insert_mode ? "插入" : "取代",
	    curr_buf->ansimode ? 'A' : 'a',
	    curr_buf->indent_mode ? 'I' : 'i',
	    curr_buf->phone_mode ? 'P' : 'p',
	    curr_buf->raw_mode ? 'R' : 'r',
	    curr_buf->currln + 1, n + 1);
}

/**
 * return the middle line of the window.
 */
static inline int
middle_line(void)
{
    return p_lines / 2 + 1;
}

/**
 * Return the previous 'num' line.  Stop at the first line if there's
 * not enough lines.
 */
static textline_t *
back_line(textline_t * pos, int num)
{
    while (num-- > 0) {
	register textline_t *item;

	if (pos && (item = pos->prev)) {
	    pos = item;
	    curr_buf->currln--;
	}
	else
	    break;
    }
    return pos;
}

/* calculate if cursor is at bottom, scroll required?
 * currently vedit does NOT handle if curr_window_line > b_lines,
 * take care if you changed curr_window_line!
 */
static inline int
cursor_at_bottom_line(void)
{
    return curr_buf->curr_window_line == b_lines ||
	   (curr_buf->phone_mode && curr_buf->curr_window_line == b_lines - 1);
}


/**
 * Return the next 'num' line.  Stop at the last line if there's not
 * enough lines.
 */
static textline_t *
forward_line(textline_t * pos, int num)
{
    while (num-- > 0) {
	register textline_t *item;

	if (pos && (item = pos->next)) {
	    pos = item;
	    curr_buf->currln++;
	}
	else
	    break;
    }
    return pos;
}

/**
 * move the cursor to the next line with ansimode fixed.
 */
static inline void
cursor_to_next_line(void)
{
    short pos;

    if (curr_buf->currline->next == NULL)
	return;

    curr_buf->currline = curr_buf->currline->next;
    curr_buf->curr_window_line++;
    curr_buf->currln++;

    if (curr_buf->ansimode) {
	pos = n2ansi(curr_buf->currpnt, curr_buf->currline->prev);
	curr_buf->currpnt = ansi2n(pos, curr_buf->currline);
    }
    else {
	curr_buf->currpnt = (curr_buf->currline->len > curr_buf->lastindent)
	    ? curr_buf->lastindent : curr_buf->currline->len;
    }
}

/**
 * opposite to cursor_to_next_line.
 */
static inline void
cursor_to_prev_line(void)
{
    short pos;

    if (curr_buf->currline->prev == NULL)
	return;

    curr_buf->curr_window_line--;
    curr_buf->currln--;
    curr_buf->currline = curr_buf->currline->prev;

    if (curr_buf->ansimode) {
	pos = n2ansi(curr_buf->currpnt, curr_buf->currline->next);
	curr_buf->currpnt = ansi2n(pos, curr_buf->currline);
    }
    else {
	curr_buf->currpnt = (curr_buf->currline->len > curr_buf->lastindent)
	    ? curr_buf->lastindent : curr_buf->currline->len;
    }
}

static inline void
window_scroll_down(void)
{
    curr_buf->curr_window_line = 0;

    if (!curr_buf->top_of_win->prev)
	indigestion(6);
    else {
	curr_buf->top_of_win = curr_buf->top_of_win->prev;
	rscroll();
    }
}

static inline void
window_scroll_up(void)
{
    curr_buf->curr_window_line = b_lines - (curr_buf->phone_mode ? 2 : 1);

    if (unlikely(!curr_buf->top_of_win->next))
	indigestion(7);
    else {
	curr_buf->top_of_win = curr_buf->top_of_win->next;
	if(curr_buf->phone_mode)
	    move(b_lines-1, 0);
	else
	    move(b_lines, 0);
	clrtoeol();
	scroll();
    }
}

/**
 * Get the current line number in the window now.
 */
static int
get_lineno_in_window(void)
{
    int             cnt = 0;
    textline_t     *p = curr_buf->currline;

    while (p && (p != curr_buf->top_of_win)) {
	cnt++;
	p = p->prev;
    }
    return cnt;
}

/**
 * shift given raw data s with length len to left by one byte.
 */
static void
raw_shift_left(char *s, int len)
{
    int i;
    for (i = 0; i < len && s[i] != 0; ++i)
	s[i] = s[i + 1];
}

/**
 * shift given raw data s with length len to right by one byte.
 */
static void
raw_shift_right(char *s, int len)
{
    int i;
    for (i = len - 1; i >= 0; --i)
	s[i + 1] = s[i];
}

/**
 * Return the pointer to the next non-space position.
 */
static char *
next_non_space_char(char *s)
{
    while (*s == ' ')
	s++;
    return s;
}

/**
 * allocate a textline_t with length length.
 */
static textline_t *
alloc_line(short length)
{
    textline_t *p;

    if ((p = (textline_t *) malloc(length + sizeof(textline_t)))) {
	memset(p, 0, length + sizeof(textline_t));
#ifdef DEBUG
	p->mlength = length;
#endif
	return p;
    }
    indigestion(13);
    abort_bbs(0);
    return NULL;
}

/**
 * Insert p after line in list. Keeps up with last line
 */
static void
insert_line(textline_t *line, textline_t *p)
{
    textline_t *n;

    if ((p->next = n = line->next))
	n->prev = p;
    else
	curr_buf->lastline = p;
    line->next = p;
    p->prev = line;
}

/**
 * delete_line deletes 'line' from the line list.
 * @param saved  true if you want to keep the line in deleted_line
 */
static void
delete_line(textline_t * line, int saved)
{
    register textline_t *p = line->prev;
    register textline_t *n = line->next;

    if (!p && !n) {
	line->data[0] = line->len = 0;
	return;
    }
    if (n)
	n->prev = p;
    else
	curr_buf->lastline = p;
    if (p)
	p->next = n;
    else
	curr_buf->firstline = n;

    curr_buf->totaln--;

    if (saved) {
	if  (curr_buf->deleted_line != NULL)
	    free(curr_buf->deleted_line);
	curr_buf->deleted_line = line;
    }
    else
	free(line);
}

static int
ask(const char *prompt)
{
    int ch;

    move(0, 0);
    clrtoeol();
    standout();
    outs(prompt);
    standend();
    ch = igetch();
    move(0, 0);
    clrtoeol();
    return (ch);
}

/**
 * Return the indent space number according to CURRENT line and the FORMER
 * line. It'll be the first line contains non-space character.
 * @return space number from the beginning to the first non-space character,
 *         return 0 if non or not in indent mode.
 */
static int
indent_space(void)
{
    textline_t     *p;
    int             spcs;

    if (!curr_buf->indent_mode)
	return 0;

    for (p = curr_buf->currline; p; p = p->prev) {
	for (spcs = 0; p->data[spcs] == ' '; ++spcs);
	    /* empty loop */
	if (p->data[spcs])
	    return spcs;
    }
    return 0;
}

/**
 * adjustline(oldp, len);
 * 用來將 oldp 指到的那一行, 重新修正成 len這麼長.
 *
 * 呼叫了 adjustline 後記得檢查有動到 currline, 如果是的話 oldcurrline 也要動
 *
 * In FreeBSD:
 * 在這邊一共做了兩次的 memcpy() , 第一次從 heap 拷到 stack ,
 * 把原來記憶體 free() 後, 又重新在 stack上 malloc() 一次,
 * 然後再拷貝回來.
 * 主要是用 sbrk() 觀察到的結果, 這樣子才真的能縮減記憶體用量.
 * 詳見 /usr/share/doc/papers/malloc.ascii.gz (in FreeBSD)
 */
static textline_t *
adjustline(textline_t *oldp, short len)
{
    // XXX write a generic version ?
    char tmpl[sizeof(textline_t) + WRAPMARGIN];
    textline_t *newp;

#ifdef deBUG
    if(oldp->len > WRAPMARGIN || oldp->len < 0) {
	kill(currpid, SIGSEGV);
    }
#endif

    memcpy(tmpl, oldp, oldp->len + sizeof(textline_t));
    free(oldp);

    newp = alloc_line(len);
    memcpy(newp, tmpl, len + sizeof(textline_t));
#ifdef DEBUG
    newp->mlength = len;
#endif
    if( oldp == curr_buf->firstline ) curr_buf->firstline = newp;
    if( oldp == curr_buf->lastline )  curr_buf->lastline  = newp;
    if( oldp == curr_buf->currline )  curr_buf->currline  = newp;
    if( oldp == curr_buf->blockline ) curr_buf->blockline = newp;
    if( oldp == curr_buf->top_of_win) curr_buf->top_of_win= newp;
    if( newp->prev != NULL ) newp->prev->next = newp;
    if( newp->next != NULL ) newp->next->prev = newp;
    //    vmsg("adjust %x to %x, length: %d", (int)oldp, (int)newp, len);
    return newp;
}

/**
 * split 'line' right before the character pos
 *
 * @return the latter line after splitting
 */
static textline_t *
split(textline_t * line, int pos)
{
    if (pos <= line->len) {
	register textline_t *p = alloc_line(WRAPMARGIN);
	register char  *ptr;
	int             spcs = indent_space();

	curr_buf->totaln++;

	p->len = line->len - pos + spcs;
	line->len = pos;

	memset(p->data, ' ', spcs);
	p->data[spcs] = 0;

	ptr = line->data + pos;
	if (curr_buf->indent_mode)
	    ptr = next_non_space_char(ptr);
	strcat(p->data + spcs, ptr);
	ptr[0] = '\0';

	if (line == curr_buf->currline && pos <= curr_buf->currpnt) {
	    line = adjustline(line, line->len);
	    insert_line(line, p);
	    // because p is allocated with fullsize, we can skip adjust.
	    // curr_buf->oldcurrline = line;
	    curr_buf->oldcurrline = curr_buf->currline = p;
	    if (pos == curr_buf->currpnt)
		curr_buf->currpnt = spcs;
	    else
		curr_buf->currpnt -= pos;
	    curr_buf->curr_window_line++;
	    curr_buf->currln++;

	    /* split may cause cursor hit bottom */
	    if (cursor_at_bottom_line())
		window_scroll_up();
	} else {
	    p = adjustline(p, p->len);
	    insert_line(line, p);
	}
	curr_buf->redraw_everything = YEA;
    }
    return line;
}

/**
 * Insert a character ch to current line.
 *
 * The line will be split if the length is >= WRAPMARGIN.  It'll be split
 * from the last space if any, or start a new line after the last character.
 */
static void
insert_char(int ch)
{
    register textline_t *p = curr_buf->currline;
    register int    i = p->len;
    register char  *s;
    int             wordwrap = YEA;

    if (curr_buf->currpnt > i) {
	indigestion(1);
	return;
    }
    if (curr_buf->currpnt < i && !curr_buf->insert_mode) {
	p->data[curr_buf->currpnt++] = ch;
	/* Thor: ansi 編輯, 可以overwrite, 不蓋到 ansi code */
	if (curr_buf->ansimode)
	    curr_buf->currpnt = ansi2n(n2ansi(curr_buf->currpnt, p), p);
    } else {
	raw_shift_right(p->data + curr_buf->currpnt, i - curr_buf->currpnt + 1);
	p->data[curr_buf->currpnt++] = ch;
	i = ++(p->len);
    }
    if (i < WRAPMARGIN)
	return;
    s = p->data + (i - 1);
    while (s != p->data && *s == ' ')
	s--;
    while (s != p->data && *s != ' ')
	s--;
    if (s == p->data) {
	wordwrap = NA;
	s = p->data + (i - 2);
    }
    p = split(p, (s - p->data) + 1);
    p = p->next;
    i = p->len;
    if (wordwrap && i >= 1) {
	if (p->data[i - 1] != ' ') {
	    p->data[i] = ' ';
	    p->data[i + 1] = '\0';
	    p->len++;
	}
    }
}

/**
 * insert_char twice.
 */
static void
insert_dchar(const char *dchar) 
{
    insert_char(*dchar);
    insert_char(*(dchar+1));
}

static void
insert_tab(void)
{
    do {
	insert_char(' ');
    } while (curr_buf->currpnt & 0x7);
}

/**
 * Insert a string.
 *
 * All printable and ESC_CHR will be directly printed out.
 * '\t' will be printed to align every 8 byte.
 * '\n' will split the line.
 * The other character will be ignore.
 */
static void
insert_string(const char *str)
{
    char ch;

    while ((ch = *str++)) {
	if (isprint2(ch) || ch == ESC_CHR)
	    insert_char(ch);
	else if (ch == '\t')
	    insert_tab();
	else if (ch == '\n')
	    split(curr_buf->currline, curr_buf->currpnt);
    }
}

/**
 * undelete the deleted line.
 *
 * return NULL if there's no deleted_line, otherwise, return currline.
 */
static textline_t *
undelete_line(void)
{
    editor_internal_t   tmp;

    if (!curr_buf->deleted_line)
	return NULL;

    tmp.top_of_win = curr_buf->top_of_win;
    tmp.indent_mode = curr_buf->indent_mode;
    tmp.curr_window_line = curr_buf->curr_window_line;

    curr_buf->indent_mode = 0;
    curr_buf->currpnt = 0;
    curr_buf->currln++;
    insert_string(curr_buf->deleted_line->data);
    insert_string("\n");

    curr_buf->top_of_win = tmp.top_of_win;
    curr_buf->indent_mode = tmp.indent_mode;
    curr_buf->curr_window_line = tmp.curr_window_line;

    assert(curr_buf->currline->prev);
    curr_buf->currline = adjustline(curr_buf->currline, curr_buf->currline->len);
    curr_buf->currline = curr_buf->currline->prev;
    curr_buf->currline = adjustline(curr_buf->currline, WRAPMARGIN);
    curr_buf->oldcurrline = curr_buf->currline;

    if (curr_buf->currline->prev == NULL) {
	curr_buf->top_of_win = curr_buf->currline;
	curr_buf->currln = 0;
    }
    return curr_buf->currline;
}

/*
 * 1) lines were joined and one was deleted 2) lines could not be joined 3)
 * next line is empty returns false if: 1) Some of the joined line wrapped
 *
 * (It assumes line has WRAPMARGIN length of data.  It seems to imply
 *  line == currline .)
 */
static int
join(textline_t * line)
{
    register textline_t *n;
    register int    ovfl;

    if (!(n = line->next))
	return YEA;
    if (!*next_non_space_char(n->data))
	return YEA;

    ovfl = line->len + n->len - WRAPMARGIN;
    if (ovfl < 0) {
	strcat(line->data, n->data);
	line->len += n->len;
	delete_line(n, 0);
	return YEA;
    } else {
	// FIXME segfault
	register char  *s;

	s = n->data + n->len - ovfl - 1;
	while (s != n->data && *s == ' ')
	    s--;
	while (s != n->data && *s != ' ')
	    s--;
	if (s == n->data)
	    return YEA;
	split(n, (s - n->data) + 1);
	if (line->len + n->len >= WRAPMARGIN) {
	    indigestion(0);
	    return YEA;
	}
	join(line);
	n = line->next;
	ovfl = n->len - 1;
	if (ovfl >= 0 && ovfl < WRAPMARGIN - 2) {
	    s = &(n->data[ovfl]);
	    if (*s != ' ') {
		strcpy(s, " ");
		n->len++;
	    }
	}
	return NA;
    }
}

static void
delete_char(void)
{
    register int    len;

    if ((len = curr_buf->currline->len)) {
	if (unlikely(curr_buf->currpnt >= len)) {
	    indigestion(1);
	    return;
	}
	raw_shift_left(curr_buf->currline->data + curr_buf->currpnt, curr_buf->currline->len - curr_buf->currpnt + 1);
	curr_buf->currline->len--;
    }
}

static void
load_file(FILE * fp)
{
    char buf[WRAPMARGIN + 2];
    int indent_mode0 = curr_buf->indent_mode;

    assert(fp);
    curr_buf->indent_mode = 0;
    while (fgets(buf, sizeof(buf), fp))
	insert_string(buf);
    curr_buf->indent_mode = indent_mode0;
}

/* 暫存檔 */
char           *
ask_tmpbuf(int y)
{
    static char     fp_buf[10] = "buf.0";
    static char     msg[] = "請選擇暫存檔 (0-9)[0]: ";

    msg[19] = fp_buf[4];
    do {
	if (!getdata(y, 0, msg, fp_buf + 4, 4, DOECHO))
	    fp_buf[4] = msg[19];
    } while (fp_buf[4] < '0' || fp_buf[4] > '9');
    return fp_buf;
}

static void
read_tmpbuf(int n)
{
    FILE           *fp;
    char            fp_tmpbuf[80];
    char            tmpfname[] = "buf.0";
    char           *tmpf;
    char            ans[4] = "y";

    if (0 <= n && n <= 9) {
	tmpfname[4] = '0' + n;
	tmpf = tmpfname;
    } else {
	tmpf = ask_tmpbuf(3);
	n = tmpf[4] - '0';
    }

    setuserfile(fp_tmpbuf, tmpf);
    if (n != 0 && n != 5 && more(fp_tmpbuf, NA) != -1)
	getdata(b_lines - 1, 0, "確定讀入嗎(Y/N)?[Y]", ans, sizeof(ans), LCECHO);
    if (*ans != 'n' && (fp = fopen(fp_tmpbuf, "r"))) {
	load_file(fp);
	fclose(fp);
	while (curr_buf->curr_window_line >= b_lines) {
	    curr_buf->curr_window_line--;
	    curr_buf->top_of_win = curr_buf->top_of_win->next;
	}
    }
}

static void
write_tmpbuf(void)
{
    FILE           *fp;
    char            fp_tmpbuf[80], ans[4];
    textline_t     *p;

    setuserfile(fp_tmpbuf, ask_tmpbuf(3));
    if (dashf(fp_tmpbuf)) {
	more(fp_tmpbuf, NA);
	getdata(b_lines - 1, 0, "暫存檔已有資料 (A)附加 (W)覆寫 (Q)取消？[A] ",
		ans, sizeof(ans), LCECHO);

	if (ans[0] == 'q')
	    return;
    }
    if ((fp = fopen(fp_tmpbuf, (ans[0] == 'w' ? "w" : "a+")))) {
	for (p = curr_buf->firstline; p; p = p->next) {
	    if (p->next || p->data[0])
		fprintf(fp, "%s\n", p->data);
	}
	fclose(fp);
    }
}

static void
erase_tmpbuf(void)
{
    char            fp_tmpbuf[80];
    char            ans[4] = "n";

    setuserfile(fp_tmpbuf, ask_tmpbuf(3));
    if (more(fp_tmpbuf, NA) != -1)
	getdata(b_lines - 1, 0, "確定刪除嗎(Y/N)?[N]",
		ans, sizeof(ans), LCECHO);
    if (*ans == 'y')
	unlink(fp_tmpbuf);
}

/**
 * 編輯器自動備份
 *(最多備份 512 行 (?))
 */
void
auto_backup(void)
{
    if (curr_buf == NULL)
	return;

    if (curr_buf->currline) {
	FILE           *fp;
	textline_t     *p, *v;
	char            bakfile[PATHLEN];
	int             count = 0;

	setuserfile(bakfile, fp_bak);
	if ((fp = fopen(bakfile, "w"))) {
	    for (p = curr_buf->firstline; p != NULL && count < 512; p = v, count++) {
		v = p->next;
		fprintf(fp, "%s\n", p->data);
		free(p);
	    }
	    fclose(fp);
	}
	curr_buf->currline = NULL;
    }
}

/**
 * 取回編輯器備份
 */
void
restore_backup(void)
{
    char            bakfile[80], buf[80];

    setuserfile(bakfile, fp_bak);
    if (dashf(bakfile)) {
	stand_title("編輯器自動復原");
	getdata(1, 0, "您有一篇文章尚未完成，(S)寫入暫存檔 (Q)算了？[S] ",
		buf, 4, LCECHO);
	if (buf[0] != 'q') {
	    setuserfile(buf, ask_tmpbuf(3));
	    Rename(bakfile, buf);
	} else
	    unlink(bakfile);
    }
}

/* 引用文章 */

static int
garbage_line(const char *str)
{
    int             qlevel = 0;

    while (*str == ':' || *str == '>') {
	if (*(++str) == ' ')
	    str++;
	if (qlevel++ >= 1)
	    return 1;
    }
    while (*str == ' ' || *str == '\t')
	str++;
    if (qlevel >= 1) {
	if (!strncmp(str, "※ ", 3) || !strncmp(str, "==>", 3) ||
	    strstr(str, ") 提到:\n"))
	    return 1;
    }
    return (*str == '\n');
}

static void
do_quote(void)
{
    int             op;
    char            buf[256];

    getdata(b_lines - 1, 0, "請問要引用原文嗎(Y/N/All/Repost)？[Y] ",
	    buf, 3, LCECHO);
    op = buf[0];

    if (op != 'n') {
	FILE           *inf;

	if ((inf = fopen(quote_file, "r"))) {
	    char           *ptr;
	    int             indent_mode0 = curr_buf->indent_mode;

	    fgets(buf, 256, inf);
	    if ((ptr = strrchr(buf, ')')))
		ptr[1] = '\0';
	    else if ((ptr = strrchr(buf, '\n')))
		ptr[0] = '\0';

	    if ((ptr = strchr(buf, ':'))) {
		char           *str;

		while (*(++ptr) == ' ');

		/* 順手牽羊，取得 author's address */
		if ((curredit & EDIT_BOTH) && (str = strchr(quote_user, '.'))) {
		    strcpy(++str, ptr);
		    str = strchr(str, ' ');
		    assert(str);
		    str[0] = '\0';
		}
	    } else
		ptr = quote_user;

	    curr_buf->indent_mode = 0;
	    insert_string("※ 引述《");
	    insert_string(ptr);
	    insert_string("》之銘言：\n");

	    if (op != 'a')	/* 去掉 header */
		while (fgets(buf, 256, inf) && buf[0] != '\n');

	    if (op == 'a')
		while (fgets(buf, 256, inf)) {
		    insert_char(':');
		    insert_char(' ');
		    insert_string(Ptt_prints(buf, STRIP_ALL));
		}
	    else if (op == 'r')
		while (fgets(buf, 256, inf))
		    insert_string(Ptt_prints(buf, NO_RELOAD));
	    else {
		if (curredit & EDIT_LIST)	/* 去掉 mail list 之 header */
		    while (fgets(buf, 256, inf) && (!strncmp(buf, "※ ", 3)));
		while (fgets(buf, 256, inf)) {
		    if (!strcmp(buf, "--\n"))
			break;
		    if (!garbage_line(buf)) {
			insert_char(':');
			insert_char(' ');
			insert_string(Ptt_prints(buf, STRIP_ALL));
		    }
		}
	    }
	    curr_buf->indent_mode = indent_mode0;
	    fclose(inf);
	}
    }
}

/**
 * 審查 user 引言的使用
 */
static int
check_quote(void)
{
    register textline_t *p = curr_buf->firstline;
    register char  *str;
    int             post_line;
    int             included_line;

    post_line = included_line = 0;
    while (p) {
	if (!strcmp(str = p->data, "--"))
	    break;
	if (str[1] == ' ' && ((str[0] == ':') || (str[0] == '>')))
	    included_line++;
	else {
	    while (*str == ' ' || *str == '\t')
		str++;
	    if (*str)
		post_line++;
	}
	p = p->next;
    }

    if ((included_line >> 2) > post_line) {
	move(4, 0);
	outs("本篇文章的引言比例超過 80%，請您做些微的修正：\n\n"
	     ANSI_COLOR(1;33) "1) 增加一些文章 或  2) 刪除不必要之引言" ANSI_RESET);
	{
	    char            ans[4];

	    getdata(12, 12, "(E)繼續編輯 (W)強制寫入？[E] ",
		    ans, sizeof(ans), LCECHO);
	    if (ans[0] == 'w')
		return 0;
	}
	return 1;
    }
    return 0;
}

/* 檔案處理：讀檔、存檔、標題、簽名檔 */
static void
read_file(const char *fpath)
{
    FILE           *fp;

    if ((fp = fopen(fpath, "r")) == NULL) {
	int fd;
	if ((fd = creat(fpath, 0600)) >= 0) {
	    close(fd);
	    return;
	}
	indigestion(4);
	abort_bbs(0);
    }
    load_file(fp);
    fclose(fp);
}

void
write_header(FILE * fp,  int ifuseanony) // FIXME unused
{

    if (curredit & EDIT_MAIL || curredit & EDIT_LIST) {
	fprintf(fp, "%s %s (%s)\n", str_author1, cuser.userid,
		cuser.username
	);
    } else {
	char           *ptr;
	struct {
	    char            author[IDLEN + 1];
	    char            board[IDLEN + 1];
	    char            title[66];
	    time4_t         date;	/* last post's date */
	    int             number;	/* post number */
	}               postlog;

	memset(&postlog, 0, sizeof(postlog));
	strlcpy(postlog.author, cuser.userid, sizeof(postlog.author));
	if (curr_buf)
	    curr_buf->ifuseanony = 0;
#ifdef HAVE_ANONYMOUS
	if (currbrdattr & BRD_ANONYMOUS) {
	    int             defanony = (currbrdattr & BRD_DEFAULTANONYMOUS);
	    if (defanony)
		getdata(3, 0, "請輸入你想用的ID，也可直接按[Enter]，"
		 "或是按[r]用真名：", real_name, sizeof(real_name), DOECHO);
	    else
		getdata(3, 0, "請輸入你想用的ID，也可直接按[Enter]使用原ID：",
			real_name, sizeof(real_name), DOECHO);
	    if (!real_name[0] && defanony) {
		strlcpy(real_name, "Anonymous", sizeof(real_name));
		strlcpy(postlog.author, real_name, sizeof(postlog.author));
		if (curr_buf)
		    curr_buf->ifuseanony = 1;
	    } else {
		if (!strcmp("r", real_name) || (!defanony && !real_name[0]))
		    strlcpy(postlog.author, cuser.userid, sizeof(postlog.author));
		else {
		    snprintf(postlog.author, sizeof(postlog.author),
			     "%s.", real_name);
		    if (curr_buf)
			curr_buf->ifuseanony = 1;
		}
	    }
	}
#endif
	strlcpy(postlog.board, currboard, sizeof(postlog.board));
	ptr = save_title;
	if (!strncmp(ptr, str_reply, 4))
	    ptr += 4;
	strncpy(postlog.title, ptr, 65);
	postlog.date = now;
	postlog.number = 1;
	append_record(".post", (fileheader_t *) & postlog, sizeof(postlog));
#ifdef HAVE_ANONYMOUS
	if (currbrdattr & BRD_ANONYMOUS) {
	    int             defanony = (currbrdattr & BRD_DEFAULTANONYMOUS);

	    fprintf(fp, "%s %s (%s) %s %s\n", str_author1, postlog.author,
		    (((!strcmp(real_name, "r") && defanony) ||
		      (!real_name[0] && (!defanony))) ? cuser.username :
		     "猜猜我是誰 ? ^o^"),
		    local_article ? str_post2 : str_post1, currboard);
	} else {
	    fprintf(fp, "%s %s (%s) %s %s\n", str_author1, cuser.userid,
		    cuser.username,
		    local_article ? str_post2 : str_post1, currboard);
	}
#else				/* HAVE_ANONYMOUS */
	fprintf(fp, "%s %s (%s) %s %s\n", str_author1, cuser.userid,
		cuser.username,
		local_article ? str_post2 : str_post1, currboard);
#endif				/* HAVE_ANONYMOUS */

    }
    save_title[72] = '\0';
    fprintf(fp, "標題: %s\n時間: %s\n", save_title, ctime4(&now));
}

void
addsignature(FILE * fp, int ifuseanony)
{
    FILE           *fs;
    int             i, num;
    char            buf[WRAPMARGIN + 1];
    char            fpath[STRLEN];

    static char     msg[] = "請選擇簽名檔 (1-9, 0=不加 X=隨機)[X]: ";
    char            ch;

    if (!strcmp(cuser.userid, STR_GUEST)) {
	fprintf(fp, "\n--\n※ 發信站 :" BBSNAME "(" MYHOSTNAME
		") \n◆ From: %s\n", fromhost);
	return;
    }
    if (!ifuseanony) {
	num = showsignature(fpath, &i);
	if (num){
	    msg[34] = ch = isdigit(cuser.signature) ? cuser.signature : 'X';
	    getdata(0, 0, msg, buf, 4, DOECHO);

	    if (!buf[0])
		buf[0] = ch;

	    if (isdigit((int)buf[0]))
		ch = buf[0];
	    else
		ch = '1' + random() % num;
	    cuser.signature = buf[0];

	    if (ch != '0') {
		fpath[i] = ch;
		if ((fs = fopen(fpath, "r"))) {
		    fputs("\n--\n", fp);
		    for (i = 0; i < MAX_SIGLINES &&
			    fgets(buf, sizeof(buf), fs); i++)
			fputs(buf, fp);
		    fclose(fs);
		}
	    }
	}
    }
#ifdef HAVE_ORIGIN
#ifdef HAVE_ANONYMOUS
    if (ifuseanony)
	fprintf(fp, "\n--\n※ 發信站: " BBSNAME "(" MYHOSTNAME
		") \n◆ From: %s\n", "匿名天使的家");
    else {
	char            temp[33];

	strncpy(temp, fromhost, 31);
	temp[32] = '\0';
	fprintf(fp, "\n--\n※ 發信站: " BBSNAME "(" MYHOSTNAME
		") \n◆ From: %s\n", temp);
    }
#else
    strncpy(temp, fromhost, 15);
    fprintf(fp, "\n--\n※ 發信站: " BBSNAME "(" MYHOSTNAME
	    ") \n◆ From: %s\n", temp);
#endif
#endif
}

static int
write_file(char *fpath, int saveheader, int *islocal)
{
    struct tm      *ptime;
    FILE           *fp = NULL;
    textline_t     *p, *v;
    char            ans[TTLEN], *msg;
    int             aborted = 0, line = 0, checksum[3], sum = 0, po = 1;

    stand_title("檔案處理");
    if (currstat == SMAIL)
	msg = "[S]儲存 (A)放棄 (T)改標題 (E)繼續 (R/W/D)讀寫刪暫存檔？";
    else if (local_article)
	msg = "[L]站內信件 (S)儲存 (A)放棄 (T)改標題 (E)繼續 "
	    "(R/W/D)讀寫刪暫存檔？";
    else
	msg = "[S]儲存 (L)站內信件 (A)放棄 (T)改標題 (E)繼續 "
	    "(R/W/D)讀寫刪暫存檔？";
    getdata(1, 0, msg, ans, 2, LCECHO);

    switch (ans[0]) {
    case 'a':
	outs("文章" ANSI_COLOR(1) " 沒有 " ANSI_RESET "存入");
	aborted = -1;
	break;
    case 'r':
	read_tmpbuf(-1);
    case 'e':
	return KEEP_EDITING;
    case 'w':
	write_tmpbuf();
	return KEEP_EDITING;
    case 'd':
	erase_tmpbuf();
	return KEEP_EDITING;
    case 't':
	move(3, 0);
	prints("舊標題：%s", save_title);
	strlcpy(ans, save_title, sizeof(ans));
	if (getdata_buf(4, 0, "新標題：", ans, sizeof(ans), DOECHO))
	    strlcpy(save_title, ans, sizeof(save_title));
	return KEEP_EDITING;
    case 's':
	if (!HasUserPerm(PERM_LOGINOK)) {
	    local_article = 1;
	    move(2, 0);
	    outs("您尚未通過身份確認，只能 Local Save。\n");
	    pressanykey();
	} else
	    local_article = 0;
	break;
    case 'l':
	local_article = 1;
    }

    if (!aborted) {

	if (saveheader && !(curredit & EDIT_MAIL) && check_quote())
	    return KEEP_EDITING;

	if (!(*fpath))
	    setuserfile(fpath, "ve_XXXXXX");
	if ((fp = fopen(fpath, "w")) == NULL) {
	    indigestion(5);
	    abort_bbs(0);
	}
	if (saveheader)
	    write_header(fp, curr_buf->ifuseanony);
    }
    for (p = curr_buf->firstline; p; p = v) {
	v = p->next;
	if (!aborted) {
	    assert(fp);
	    msg = p->data;
	    if (v || msg[0]) {
		trim(msg);

		line++;
		if (currstat == POSTING && po ) {
		    saveheader = str_checksum(msg);
		    if (saveheader) {
			if (postrecord.last_bid != currbid &&
			    postrecord.checksum[po] == saveheader) {
			    po++;
			    if (po > 3) {
				postrecord.times++;
				postrecord.last_bid = currbid;
				po = 0;
			    }
			} else
			    po = 1;
			if (currstat == POSTING && line >= curr_buf->totaln / 2 &&
			    sum < 3) {
			    checksum[sum++] = saveheader;
			}
		    }
		}
		fprintf(fp, "%s\n", msg);
	    }
	}
	free(p);
    }
    curr_buf->currline = NULL;

    if (postrecord.times > MAX_CROSSNUM-1 && hbflcheck(currbid, currutmp->uid))
	anticrosspost();

    if (po && sum == 3) {
	memcpy(&postrecord.checksum[1], checksum, sizeof(int) * 3);
        if(postrecord.last_bid != currbid)
	           postrecord.times = 0;
    }
    if (!aborted) {
	if (islocal)
	    *islocal = local_article;
	if (currstat == POSTING || currstat == SMAIL)
	    addsignature(fp, curr_buf->ifuseanony);
	else if (currstat == REEDIT
#ifndef ALL_REEDIT_LOG
		 && strcmp(currboard, str_sysop) == 0
#endif
	    ) {
	    ptime = localtime4(&now);
	    fprintf(fp,
		    "※ 編輯: %-15s 來自: %-20s (%02d/%02d %02d:%02d)\n",
		    cuser.userid, fromhost,
		    ptime->tm_mon + 1, ptime->tm_mday, ptime->tm_hour, ptime->tm_min);
	}
	fclose(fp);

	if (local_article && (currstat == POSTING))
	    return 0;
	return 0;
    }
    return aborted;
}

static inline int
has_block_selection(void)
{
    return curr_buf->blockln >= 0;
}

/**
 * a block is continual lines of the article.
 */

/**
 * stop the block selection.
 */
static void
block_cancel(void)
{
    if (has_block_selection()) {
	curr_buf->blockln = -1;
	curr_buf->redraw_everything = YEA;
    }
}

static inline void
setup_block_begin_end(textline_t **begin, textline_t **end)
{
    if (curr_buf->currln >= curr_buf->blockln) {
	*begin = curr_buf->blockline;
	*end = curr_buf->currline;
    } else {
	*begin = curr_buf->currline;
	*end = curr_buf->blockline;
    }
}

static inline void
setup_block_begin_end_number(short *begin, short *end)
{
    if (curr_buf->currpnt > curr_buf->blockpnt) {
	*begin = curr_buf->blockpnt;
	*end = curr_buf->currpnt;
    } else {
	*begin  = curr_buf->currpnt;
	*end = curr_buf->blockpnt;
    }
}

#define BLOCK_TRUNCATE	0
#define BLOCK_APPEND	1
/**
 * save the selected block to file 'fname.'
 * mode: BLOCK_TRUNCATE  truncate mode
 *       BLOCK_APPEND    append mode
 */
static void
block_save_to_file(const char *fname, int mode)
{
    textline_t *begin, *end;
    char fp_tmpbuf[80];
    FILE *fp;

    if (!has_block_selection())
	return;

    setup_block_begin_end(&begin, &end);

    setuserfile(fp_tmpbuf, fname);
    if ((fp = fopen(fp_tmpbuf, mode == BLOCK_APPEND ? "a+" : "w+"))) {
	if (begin == end && curr_buf->currpnt != curr_buf->blockpnt) {
	    char buf[WRAPMARGIN + 2];

	    if (curr_buf->currpnt > curr_buf->blockpnt) {
		strlcpy(buf, begin->data + curr_buf->blockpnt, sizeof(buf));
		buf[curr_buf->currpnt - curr_buf->blockpnt] = 0;
	    } else {
		strlcpy(buf, begin->data + curr_buf->currpnt, sizeof(buf));
		buf[curr_buf->blockpnt - curr_buf->currpnt] = 0;
	    }
	    fputs(buf, fp);
	} else {
	    textline_t *p;

	    for (p = begin; p != end; p = p->next)
		fprintf(fp, "%s\n", p->data);
	    fprintf(fp, "%s\n", end->data);
	}
	fclose(fp);
    }
}

/**
 * delete selected block
 */
static void
block_delete(void)
{
    textline_t *begin, *end;

    if (!has_block_selection())
	return;

    setup_block_begin_end(&begin, &end);

    if (begin == end && curr_buf->currpnt != curr_buf->blockpnt) {
	short min, max;

	setup_block_begin_end_number(&min, &max);
	strcpy(begin->data + min, begin->data + max);
	begin->len -= max - min;
	curr_buf->currpnt = min;

    } else {
	textline_t *p;

	if (curr_buf->currln >= curr_buf->blockln) {
	    curr_buf->curr_window_line -= (curr_buf->currln - curr_buf->blockln);
	    if (curr_buf->curr_window_line < 0) {
		curr_buf->curr_window_line = 0;
		if (end->next)
		    (curr_buf->top_of_win = end->next)->prev = begin->prev;
		else
		    curr_buf->top_of_win = (curr_buf->lastline = begin->prev);
	    }
	    curr_buf->currln -= (curr_buf->currln - curr_buf->blockln);
	}

	if (begin->prev)
	    begin->prev->next = end->next;
	else if (end->next)
	    curr_buf->top_of_win = curr_buf->firstline = end->next;
	else {
	    curr_buf->currline = curr_buf->top_of_win = curr_buf->firstline = curr_buf->lastline = alloc_line(WRAPMARGIN);
	    curr_buf->currln = curr_buf->curr_window_line = curr_buf->edit_margin = 0;
	}

	if (end->next) {
	    curr_buf->currline = end->next;
	    curr_buf->currline->prev = begin->prev;
	}
	else if (begin->prev) {
	    curr_buf->currline = (curr_buf->lastline = begin->prev);
	    curr_buf->currln--;
	    if (curr_buf->curr_window_line > 0)
		curr_buf->curr_window_line--;
	}

	for (p = begin; p != end; curr_buf->totaln--)
	    free((p = p->next)->prev);
	free(end);
	curr_buf->totaln--;

	curr_buf->currpnt = 0;
    }
}

static void
block_cut(void)
{
    if (!has_block_selection())
	return;

    block_save_to_file("buf.0", BLOCK_TRUNCATE);
    block_delete();

    curr_buf->blockln = -1;
    curr_buf->redraw_everything = YEA;
}

static void
block_copy(void)
{
    if (!has_block_selection())
	return;

    block_save_to_file("buf.0", BLOCK_TRUNCATE);

    curr_buf->blockln = -1;
    curr_buf->redraw_everything = YEA;
}

static void
block_prompt(void)
{
    char fp_tmpbuf[80];
    char tmpfname[] = "buf.0";
    char mode[2];          

    move(b_lines - 1, 0);
    clrtoeol();

    if (!getdata(b_lines - 1, 0, "把區塊移至暫存檔 (0:Cut, 5:Copy, 6-9, q: Cancel)[0] ", tmpfname + 4, 4, LCECHO))
	tmpfname[4] = '0';

    if (tmpfname[4] < '0' || tmpfname[4] > '9')
	goto cancel_block;

    if (tmpfname[4] == '0') {
	block_cut();
	return;
    }
    else if (tmpfname[4] == '5') {
	block_copy();
	return;
    }

    setuserfile(fp_tmpbuf, tmpfname);
    if (dashf(fp_tmpbuf)) {
	more(fp_tmpbuf, NA);
	getdata(b_lines - 1, 0, "暫存檔已有資料 (A)附加 (W)覆寫 (Q)取消？[W] ", mode, sizeof(mode), LCECHO);
	if (mode[0] == 'q')
	    goto cancel_block;
	else if (mode[0] != 'a')
	    mode[0] = 'w';
    }

    if (getans("刪除區塊(Y/N)?[N] ") != 'y')
	goto cancel_block;

    block_save_to_file(tmpfname, mode[0] == 'a' ? BLOCK_APPEND : BLOCK_TRUNCATE);

cancel_block:
    curr_buf->blockln = -1;
    curr_buf->redraw_everything = YEA;
}

static void
block_select(void)
{
    curr_buf->blockln = curr_buf->currln;
    curr_buf->blockpnt = curr_buf->currpnt;
    curr_buf->blockline = curr_buf->currline;
}

/**
 * Just like outs, but print out '*' instead of 27(decimal) in the given string.
 *
 * FIXME column could not start from 0
 */

void
edit_outs(const char *text)
{
    edit_outs_n(text, scr_cols);
}

void
edit_outs_n(const char *text, int n)
{
    int    column = 0;

    register unsigned char inAnsi = 0;
    register unsigned char ch;

#ifdef DBCSAWARE_EDIT
    /* 0 = N/A, 1 = leading byte printed, 2 = ansi in middle */
    register unsigned char isDBCS = 0;
#endif

    while ((ch = *text++) && (++column < t_columns) && n-- > 0)
    {
	if(inAnsi)
	{
	    outc(ch);
	    if(!ANSI_IN_ESCAPE(ch))
	    {
		inAnsi = 0;
		outs(ANSI_RESET);
	    }

	}
	else if(ch == ESC_CHR)
	{
	    inAnsi = 1;
#ifdef DBCSAWARE_EDIT
	    if(isDBCS == 1)
	    {
		isDBCS = 2;
		outs(//ESC_STR "[1D"
			ANSI_COLOR(1;33) "?" ANSI_RESET);
	    }
#endif
	    outs(ANSI_COLOR(1) "*");
	}
	else
	{
#ifdef DBCSAWARE_EDIT
	    if(isDBCS == 1)
		isDBCS = 0;
	    else if (isDBCS == 2)
	    {
		/* ansi in middle. */
		outs(ANSI_COLOR(0;33) "?" ANSI_RESET);
		isDBCS = 0;
		continue;
	    }
	    else
		if(IS_BIG5_HI(ch))
		{
		    isDBCS = 1;
		    // peak next char
		    if(n > 0 && *text == ESC_CHR)
			continue;
		}
#endif
	    outc(ch);
	}
    } 

    if(inAnsi)
	outs(ANSI_RESET);
}

static inline void
display_textline_internal(textline_t *p, int i, int min, int max)
{
    char inblock;
    short tmp;
    void (*output)(const char *);
    void (*output_n)(const char *, int);

    move(i, 0);
    clrtoeol();

    if (!p) {
	outc('~');
	return;
    }

    if (curr_buf->ansimode) {
	output = outs;
	output_n = outs_n;
    }
    else {
	output = edit_outs;
	output_n = edit_outs_n;
    }

    tmp = curr_buf->currln - curr_buf->curr_window_line + i;

    /* if line 'i' is in block's range */
    if (has_block_selection() && (
		(curr_buf->blockln <= curr_buf->currln &&
		 curr_buf->blockln <= tmp && tmp <= curr_buf->currln) ||
		(curr_buf->currln <= tmp && tmp <= curr_buf->blockln)) ) {
	outs(ANSI_COLOR(7));
	inblock = 1;
    } else
	inblock = 0;

    if (curr_buf->currln == curr_buf->blockln && p == curr_buf->currline && max > min) {
	outs(ANSI_RESET);
	(*output_n)(p->data, min);
	outs(ANSI_COLOR(7));
	(*output_n)(p->data + min, max - min);
	outs(ANSI_RESET);
	(*output)(p->data + max);
    } else

#ifdef DBCSAWARE_EDIT
	if(mbcs_mode && curr_buf->edit_margin > 0)
	{
	    if(curr_buf->edit_margin >= p->len)
	    {
		(*output)("");
	    } else {
		int newpnt = curr_buf->edit_margin;
		unsigned char *pdata = &p->data[0] + curr_buf->edit_margin;
		if(mbcs_mode)
		    newpnt = fix_cursor(p->data, newpnt, FC_LEFT);
		if(newpnt == curr_buf->edit_margin-1)
		{
		    (*output)(ANSI_COLOR(1) "<" ANSI_RESET);
		    pdata++;
		}
		(*output)(pdata);
	    }

	} else
#endif
	(*output)((curr_buf->edit_margin < p->len) ? &p->data[curr_buf->edit_margin] : "");

    if (inblock)
	outs(ANSI_RESET);
}
/**
 * given a textline_t 'text' and the line number 'n' in the content,
 * display this line.
 *
 * this is not called... why? */
/*
static void
display_textline(textline_t *text, int n)
{
    short begin, end;

    setup_block_begin_end_number(&begin, &end);
    display_textline_internal(text, n, begin, end);
}
*/

static void
refresh_window(void)
{
    register textline_t *p;
    register int    i;
    short           begin, end;

    setup_block_begin_end_number(&begin, &end);

    for (p = curr_buf->top_of_win, i = 0; i < b_lines; i++) {
	display_textline_internal(p, i, begin, end);

	if (p)
	    p = p->next;
    }
    edit_msg();
}

static void
goto_line(int lino)
{
    if (lino > 0 && lino <= curr_buf->totaln + 1) {
	textline_t     *p;

	p = curr_buf->firstline;
	curr_buf->currln = lino - 1;

	while (--lino && p->next)
	    p = p->next;

	if (p)
	    curr_buf->currline = p;
	else {
	    curr_buf->currln = curr_buf->totaln;
	    curr_buf->currline = curr_buf->lastline;
	}

	curr_buf->currpnt = 0;

	/* move window */
	if (curr_buf->currln < middle_line()) {
	    curr_buf->top_of_win = curr_buf->firstline;
	    curr_buf->curr_window_line = curr_buf->currln;
	} else {
	    int i;
	    curr_buf->curr_window_line = middle_line();
	    for (i = curr_buf->curr_window_line; i; i--)
		p = p->prev;
	    curr_buf->top_of_win = p;
	}
    }
    curr_buf->redraw_everything = YEA;
}

static void
prompt_goto_line(void)
{
    char buf[10];

    if (getdata(b_lines - 1, 0, "跳至第幾行:", buf, sizeof(buf), DOECHO))
	goto_line(atoi(buf));
}

/**
 * search string interactively.
 * @param mode 0: prompt
 *             1: forward
 *            -1: backward
 */
static void
search_str(int mode)
{
    const int max_keyword = 65;
    char *str;
    char            ans[4] = "n";

    if (curr_buf->searched_string == NULL) {
	if (mode != 0)
	    return;
	curr_buf->searched_string = (char *)malloc(max_keyword * sizeof(char));
	curr_buf->searched_string[0] = 0;
    }

    str = curr_buf->searched_string;

    if (!mode) {
	if (getdata_buf(b_lines - 1, 0, "[搜尋]關鍵字:",
			str, max_keyword, DOECHO))
	    if (*str) {
		if (getdata(b_lines - 1, 0, "區分大小寫(Y/N/Q)? [N] ",
			    ans, sizeof(ans), LCECHO) && *ans == 'y')
		    curr_buf->substr_fp = strstr;
		else
		    curr_buf->substr_fp = strcasestr;
	    }
    }
    if (*str && *ans != 'q') {
	textline_t     *p;
	char           *pos = NULL;
	int             lino;

	if (mode >= 0) {
	    for (lino = curr_buf->currln, p = curr_buf->currline; p; p = p->next, lino++)
		if ((pos = (*curr_buf->substr_fp)(p->data + (lino == curr_buf->currln ? curr_buf->currpnt + 1 : 0),
				str)) && (lino != curr_buf->currln ||
					  pos - p->data != curr_buf->currpnt))
		    break;
	} else {
	    for (lino = curr_buf->currln, p = curr_buf->currline; p; p = p->prev, lino--)
		if ((pos = (*curr_buf->substr_fp)(p->data, str)) &&
		    (lino != curr_buf->currln || pos - p->data != curr_buf->currpnt))
		    break;
	}
	if (pos) {
	    /* move window */
	    curr_buf->currline = p;
	    curr_buf->currln = lino;
	    curr_buf->currpnt = pos - p->data;
	    if (lino < middle_line()) {
		curr_buf->top_of_win = curr_buf->firstline;
		curr_buf->curr_window_line = curr_buf->currln;
	    } else {
		int             i;

		curr_buf->curr_window_line = middle_line();
		for (i = curr_buf->curr_window_line; i; i--)
		    p = p->prev;
		curr_buf->top_of_win = p;
	    }
	    curr_buf->redraw_everything = YEA;
	}
    }
    if (!mode)
	curr_buf->redraw_everything = YEA;
}

/**
 * move the cursor from bracket to corresponding bracket.
 */
static void
match_paren(void)
{
    char           *parens = "()[]{}";
    int             type;
    int             parenum = 0;
    char           *ptype;
    textline_t     *p;
    int             lino;
    int             c, i = 0;

    if (!(ptype = strchr(parens, curr_buf->currline->data[curr_buf->currpnt])))
	return;

    type = (ptype - parens) / 2;
    parenum = ((ptype - parens) % 2) ? -1 : 1;

    /* FIXME CRASH */
    /* FIXME refactoring */
    if (parenum > 0) {
	for (lino = curr_buf->currln, p = curr_buf->currline; p; p = p->next, lino++) {
	    int len = strlen(p->data);
	    for (i = (lino == curr_buf->currln) ? curr_buf->currpnt + 1 : 0; i < len; i++) {
		if (p->data[i] == '/' && p->data[++i] == '*') {
		    ++i;
		    while (1) {
			while (i < len &&
			       !(p->data[i] == '*' && p->data[i + 1] == '/')) {
			    i++;
			}
			if (i >= len && p->next) {
			    p = p->next;
			    len = strlen(p->data);
			    ++lino;
			    i = 0;
			} else
			    break;
		    }
		} else if ((c = p->data[i]) == '\'' || c == '"') {
		    while (1) {
			while (i < len - 1) {
			    if (p->data[++i] == '\\' && (size_t)i < len - 2)
				++i;
			    else if (p->data[i] == c)
				goto end_quote;
			}
			if ((size_t)i >= len - 1 && p->next) {
			    p = p->next;
			    len = strlen(p->data);
			    ++lino;
			    i = -1;
			} else
			    break;
		    }
	    end_quote:
		    ;
		} else if ((ptype = strchr(parens, p->data[i])) &&
			   (ptype - parens) / 2 == type) {
		    if (!(parenum += ((ptype - parens) % 2) ? -1 : 1))
			goto p_outscan;
		}
	    }
	}
    } else {
	for (lino = curr_buf->currln, p = curr_buf->currline; p; p = p->prev, lino--) {
	    int len = strlen(p->data);
	    for (i = ((lino == curr_buf->currln) ?  curr_buf->currpnt - 1 : len - 1); i >= 0; i--) {
		if (p->data[i] == '/' && p->data[--i] == '*' && i > 0) {
		    --i;
		    while (1) {
			while (i > 0 &&
				!(p->data[i] == '*' && p->data[i - 1] == '/')) {
			    i--;
			}
			if (i <= 0 && p->prev) {
			    p = p->prev;
			    len = strlen(p->data);
			    --lino;
			    i = len - 1;
			} else
			    break;
		    }
		} else if ((c = p->data[i]) == '\'' || c == '"') {
		    while (1) {
			while (i > 0)
			    if (i > 1 && p->data[i - 2] == '\\')
				i -= 2;
			    else if ((p->data[--i]) == c)
				goto begin_quote;
			if (i <= 0 && p->prev) {
			    p = p->prev;
			    len = strlen(p->data);
			    --lino;
			    i = len;
			} else
			    break;
		    }
begin_quote:
		    ;
		} else if ((ptype = strchr(parens, p->data[i])) &&
			(ptype - parens) / 2 == type) {
		    if (!(parenum += ((ptype - parens) % 2) ? -1 : 1))
			goto p_outscan;
		}
	    }
	}
    }
p_outscan:
    if (!parenum) {
	int             top = curr_buf->currln - curr_buf->curr_window_line;
	int             bottom = curr_buf->currln - curr_buf->curr_window_line + b_lines - 1;

	curr_buf->currpnt = i;
	curr_buf->currline = p;
	curr_buf->curr_window_line += lino - curr_buf->currln;
	curr_buf->currln = lino;

	if (lino < top || lino > bottom) {
	    if (lino < middle_line()) {
		curr_buf->top_of_win = curr_buf->firstline;
		curr_buf->curr_window_line = curr_buf->currln;
	    } else {
		int             i;

		curr_buf->curr_window_line = middle_line();
		for (i = curr_buf->curr_window_line; i; i--)
		    p = p->prev;
		curr_buf->top_of_win = p;
	    }
	    curr_buf->redraw_everything = YEA;
	}
    }
}

static void
currline_shift_left(void)
{
    int currpnt0;

    if (curr_buf->currline->len <= 0)
	return;

    currpnt0 = curr_buf->currpnt;
    curr_buf->currpnt = 0;
    delete_char();
    curr_buf->currpnt = (currpnt0 <= curr_buf->currline->len) ? currpnt0 : currpnt0 - 1;
    if (curr_buf->ansimode)
	curr_buf->currpnt = ansi2n(n2ansi(curr_buf->currpnt, curr_buf->currline), curr_buf->currline);
}

static void
currline_shift_right(void)
{
    int currpnt0;

    if (curr_buf->currline->len >= WRAPMARGIN - 1)
	return;

    currpnt0 = curr_buf->currpnt;
    curr_buf->currpnt = 0;
    insert_char(' ');
    curr_buf->currpnt = currpnt0;
}

static void
cursor_to_next_word(void)
{
    while (curr_buf->currpnt < curr_buf->currline->len &&
	    isalnum((int)curr_buf->currline->data[++curr_buf->currpnt]));
    while (curr_buf->currpnt < curr_buf->currline->len &&
	    isspace((int)curr_buf->currline->data[++curr_buf->currpnt]));
}

static void
cursor_to_prev_word(void)
{
    while (curr_buf->currpnt && isspace((int)curr_buf->currline->data[--curr_buf->currpnt]));
    while (curr_buf->currpnt && isalnum((int)curr_buf->currline->data[--curr_buf->currpnt]));
    if (curr_buf->currpnt > 0)
	curr_buf->currpnt++;
}

static void
delete_current_word(void)
{
    while (curr_buf->currpnt < curr_buf->currline->len) {
	delete_char();
	if (!isalnum((int)curr_buf->currline->data[curr_buf->currpnt]))
	    break;
    }
    while (curr_buf->currpnt < curr_buf->currline->len) {
	delete_char();
	if (!isspace((int)curr_buf->currline->data[curr_buf->currpnt]))
	    break;
    }
}

/**
 * transform every "*[" in given string to KEY_ESC "["
 */
static void
transform_to_color(char *line)
{
    while (line[0] && line[1])
	if (line[0] == '*' && line[1] == '[') {
	    line[0] = KEY_ESC;
	    line += 2;
	} else
	    ++line;
}

static void
block_color(void)
{
    textline_t     *begin, *end, *p;

    setup_block_begin_end(&begin, &end);

    p = begin;
    while (1) {
	transform_to_color(p->data);
	if (p == end)
	    break;
	else
	    p = p->next;
    }
    block_cancel();
}

/**
 * insert ansi code
 */
static void
insert_ansi_code(void)
{
    int ch = curr_buf->insert_mode;
    curr_buf->insert_mode = curr_buf->redraw_everything = YEA;
    if (!curr_buf->ansimode)
	insert_string(reset_color);
    else {
	char            ans[4];
	move(b_lines - 2, 55);
	outs(ANSI_COLOR(1;33;40) "B" ANSI_COLOR(41) "R" ANSI_COLOR(42) "G" ANSI_COLOR(43) "Y" ANSI_COLOR(44) "L"
		ANSI_COLOR(45) "P" ANSI_COLOR(46) "C" ANSI_COLOR(47) "W" ANSI_RESET);
	if (getdata(b_lines - 1, 0,
		    "請輸入  亮度/前景/背景[正常白字黑底][0wb]：",
		    ans, sizeof(ans), LCECHO))
	{
	    const char      t[] = "BRGYLPCW";
	    char            color[15];
	    char           *tmp, *apos = ans;
	    int             fg, bg;

	    strcpy(color, ESC_STR "[");
	    if (isdigit((int)*apos)) {
		sprintf(color,"%s%c", color, *(apos++)); 
		if (*apos)
		    strcat(color, ";");
	    }
	    if (*apos) {
		if ((tmp = strchr(t, toupper(*(apos++)))))
		    fg = tmp - t + 30;
		else
		    fg = 37;
		sprintf(color, "%s%d", color, fg);
	    }
	    if (*apos) {
		if ((tmp = strchr(t, toupper(*(apos++)))))
		    bg = tmp - t + 40;
		else
		    bg = 40;
		sprintf(color, "%s;%d", color, bg);
	    }
	    strcat(color, "m");
	    insert_string(color);
	} else
    	    insert_string(reset_color);
    }
    curr_buf->insert_mode = ch;
}

static inline void
phone_mode_switch(void)
{
    if (curr_buf->phone_mode)
	curr_buf->phone_mode = 0;
    else {
	curr_buf->phone_mode = 1;
	if (!curr_buf->last_phone_mode)
	    curr_buf->last_phone_mode = 2;
    }
}

/**
 * return coresponding phone char of given key c
 */
static const char* 
phone_char(char c)
{
    if (curr_buf->last_phone_mode > 0 && curr_buf->last_phone_mode < 20) {
	if (tolower(c)<'a'||(tolower(c)-'a') >= strlen(BIG5[curr_buf->last_phone_mode - 1]) / 2)
	    return 0;
	return BIG5[curr_buf->last_phone_mode - 1] + (tolower(c) - 'a') * 2;
    }
    else if (curr_buf->last_phone_mode >= 20) {
	if (c == '.') c = '/';

	if (c < '/' || c > '9')
	    return 0;

	return table[curr_buf->last_phone_mode - 20] + (c - '/') * 2;
    }
    return 0;
}

/**
 * When get the key for phone mode, handle it (e.g. edit_msg) and return the
 * key.  Otherwise return 0.
 */
static inline char
phone_mode_filter(char ch)
{
    if (!curr_buf->phone_mode)
	return 0;

    switch (ch) {
	case 'z':
	case 'Z':
	    if (curr_buf->last_phone_mode < 20)
		curr_buf->last_phone_mode = 20;
	    else
		curr_buf->last_phone_mode = 2;
	    edit_msg();
	    return ch;
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	    if (curr_buf->last_phone_mode < 20) {
		curr_buf->last_phone_mode = ch - '0' + 1;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
	case '-':
	    if (curr_buf->last_phone_mode < 20) {
		curr_buf->last_phone_mode = 11;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
	case '=':
	    if (curr_buf->last_phone_mode < 20) {
		curr_buf->last_phone_mode = 12;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
	case '`':
	    if (curr_buf->last_phone_mode < 20) {
		curr_buf->last_phone_mode = 13;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
	case '/':
	    if (curr_buf->last_phone_mode >= 20) {
		curr_buf->last_phone_mode += 4;
		if (curr_buf->last_phone_mode > 27)
		    curr_buf->last_phone_mode -= 8;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
	case '*':
	    if (curr_buf->last_phone_mode >= 20) {
		curr_buf->last_phone_mode++;
		if ((curr_buf->last_phone_mode - 21) % 4 == 3)
		    curr_buf->last_phone_mode -= 4;
		curr_buf->redraw_everything = YEA;
		return ch;
	    }
	    break;
    }

    return 0;
}

/* 編輯處理：主程式、鍵盤處理 */
int
vedit(char *fpath, int saveheader, int *islocal)
{
    char            last = 0;	/* the last key you press */
    int             ch, tmp;

    int             mode0 = currutmp->mode;
    int             destuid0 = currutmp->destuid;
    int             money = 0;
    int             interval = 0;
    time4_t         th = now;
    int             count = 0, tin = 0;
    char            trans_buffer[256];

    STATINC(STAT_VEDIT);
    currutmp->mode = EDITING;
    currutmp->destuid = currstat;

#ifdef DBCSAWARE_EDIT
    mbcs_mode = (cuser.uflag & DBCSAWARE_FLAG) ? 1 : 0;
#endif

    enter_edit_buffer();

    curr_buf->oldcurrline = curr_buf->currline = curr_buf->top_of_win =
	curr_buf->firstline = curr_buf->lastline = alloc_line(WRAPMARGIN);

    if (*fpath) {
	read_file(fpath);
    }

    if (*quote_file) {
	do_quote();
	*quote_file = '\0';
    }

    if(curr_buf->oldcurrline != curr_buf->firstline || curr_buf->currline != curr_buf->firstline) {
	/* we must adjust because cursor (currentline) moved. */
	curr_buf->oldcurrline = curr_buf->currline = curr_buf->top_of_win =
           curr_buf->firstline= adjustline(curr_buf->firstline, WRAPMARGIN);
    }

    /* No matter you quote or not, just start the cursor from (0,0) */
    curr_buf->currpnt = curr_buf->currln = curr_buf->curr_window_line = 
    curr_buf->edit_margin = curr_buf->last_margin = 0;

    while (1) {
	if (curr_buf->redraw_everything || has_block_selection()) {
	    refresh_window();
	    curr_buf->redraw_everything = NA;
	}
	if( curr_buf->oldcurrline != curr_buf->currline ){
	    curr_buf->oldcurrline = adjustline(curr_buf->oldcurrline, curr_buf->oldcurrline->len);
	    curr_buf->oldcurrline = curr_buf->currline = adjustline(curr_buf->currline, WRAPMARGIN);
	}

	if (curr_buf->ansimode)
	    ch = n2ansi(curr_buf->currpnt, curr_buf->currline);
	else
	    ch = curr_buf->currpnt - curr_buf->edit_margin;
	move(curr_buf->curr_window_line, ch);

#if 0 // DEPRECATED, it's really not a well known expensive feature
	if (!curr_buf->line_dirty && strcmp(editline, curr_buf->currline->data))
	    strcpy(editline, curr_buf->currline->data);
#endif

	ch = igetch();
	/* jochang debug */
	if ((interval = (now - th))) {
	    th = now;
	    if ((char)ch != last) {
		money++;
		last = (char)ch;
	    }
	}
	if (interval && interval == tin)
          {  // Ptt : +- 1 秒也算
	    count++;
            if(count>60) 
            {
             money = 0;
             count = 0;
/*
             log_file("etc/illegal_money",  LOG_CREAT | LOG_VF,
             ANSI_COLOR(1;33;46) "%s " ANSI_COLOR(37;45) " 用機器人發表文章 " ANSI_COLOR(37) " %s" ANSI_RESET "\n",
             cuser.userid, ctime4(&now));
             post_violatelaw(cuser.userid, "Ptt系統警察", 
                 "用機器人發表文章", "強制離站");
             abort_bbs(0);
*/
            }
          }
	else if(interval){
	    count = 0;
	    tin = interval;
	}
#ifndef DBCSAWARE_EDIT
	/* this is almost useless! */
	if (curr_buf->raw_mode) {
	    switch (ch) {
	    case Ctrl('S'):
	    case Ctrl('Q'):
	    case Ctrl('T'):
		continue;
	    }
	}
#endif

	if (phone_mode_filter(ch))
	    continue;

	if (ch < 0x100 && isprint2(ch)) {
	    const char *pstr;
            if(curr_buf->phone_mode && (pstr=phone_char(ch)))
	   	insert_dchar(pstr); 
	    else
		insert_char(ch);
	    curr_buf->lastindent = -1;
	} else {
	    if (ch == KEY_UP || ch == KEY_DOWN ){
		if (curr_buf->lastindent == -1)
		    curr_buf->lastindent = curr_buf->currpnt;
	    } else
		curr_buf->lastindent = -1;
	    if (ch == KEY_ESC)
		switch (KEY_ESC_arg) {
		case ',':
		    ch = Ctrl(']');
		    break;
		case '.':
		    ch = Ctrl('T');
		    break;
		case 'v':
		    ch = KEY_PGUP;
		    break;
		case 'a':
		case 'A':
		    ch = Ctrl('V');
		    break;
		case 'X':
		    ch = Ctrl('X');
		    break;
		case 'q':
		    ch = Ctrl('Q');
		    break;
		case 'o':
		    ch = Ctrl('O');
		    break;
#if 0 // DEPRECATED, it's really not a well known expensive feature
		case '-':
		    ch = Ctrl('_');
		    break;
#endif
		case 's':
		    ch = Ctrl('S');
		    break;
		}

	    switch (ch) {
	    case KEY_F10:
	    case Ctrl('X'):	/* Save and exit */
		tmp = write_file(fpath, saveheader, islocal);
		if (tmp != KEEP_EDITING) {
		    currutmp->mode = mode0;
		    currutmp->destuid = destuid0;

		    exit_edit_buffer();
		    if (!tmp)
			return money;
		    else
			return tmp;
		}
		curr_buf->oldcurrline = curr_buf->currline;
		curr_buf->redraw_everything = YEA;
		break;
	    case KEY_F5:
		prompt_goto_line();
		curr_buf->redraw_everything = YEA;
		break;
	    case KEY_F8:
		t_users();
		curr_buf->redraw_everything = YEA;
		break;
	    case Ctrl('W'):
		block_cut();
		// curr_buf->oldcurrline is freed in block_cut, and currline is
		// well adjusted now.  This will avoid re-adjusting later.
		// It's not a good implementation, try to find a better
		// solution!
		curr_buf->oldcurrline = curr_buf->currline;
		break;
	    case Ctrl('Q'):	/* Quit without saving */
		ch = ask("結束但不儲存 (Y/N)? [N]: ");
		if (ch == 'y' || ch == 'Y') {
		    currutmp->mode = mode0;
		    currutmp->destuid = destuid0;
		    exit_edit_buffer();
		    return -1;
		}
		curr_buf->redraw_everything = YEA;
		break;
	    case Ctrl('C'):
		insert_ansi_code();
		break;
	    case KEY_ESC:
		switch (KEY_ESC_arg) {
		case 'U':
		    t_users();
		    curr_buf->redraw_everything = YEA;
		    break;
		case 'i':
		    t_idle();
		    curr_buf->redraw_everything = YEA;
		    break;
		case 'n':
		    search_str(1);
		    break;
		case 'p':
		    search_str(-1);
		    break;
		case 'L':
		case 'J':
		    prompt_goto_line();
		    curr_buf->redraw_everything = YEA;
		    break;
		case ']':
		    match_paren();
		    break;
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		    read_tmpbuf(KEY_ESC_arg - '0');
		    curr_buf->oldcurrline = curr_buf->currline;
		    curr_buf->redraw_everything = YEA;
		    break;
		case 'l':	/* block delete */
		case ' ':
		    if (has_block_selection()) {
			block_prompt();
			// curr_buf->oldcurrline is freed in block_cut, and currline is
			// well adjusted now.  This will avoid re-adjusting later.
			// It's not a good implementation, try to find a better
			// solution!
			curr_buf->oldcurrline = curr_buf->currline;
		    }
		    else
			block_select();
		    break;
		case 'u':
		    block_cancel();
		    break;
		case 'c':
		    block_copy();
		    break;
		case 'y':
		    curr_buf->oldcurrline = undelete_line();
		    if (curr_buf->oldcurrline == NULL)
			curr_buf->oldcurrline = curr_buf->currline;
		    break;
		case 'R':
#ifdef DBCSAWARE_EDIT
		case 'r':
		    mbcs_mode =! mbcs_mode;
#endif
		    curr_buf->raw_mode ^= 1;
		    break;
		case 'I':
		    curr_buf->indent_mode ^= 1;
		    break;
		case 'j':
		    currline_shift_left();
		    break;
		case 'k':
		    currline_shift_right();
		    break;
		case 'f':
		    cursor_to_next_word();
		    break;
		case 'b':
		    cursor_to_prev_word();
		    break;
		case 'd':
		    delete_current_word();
		    break;
		}
		break;
#if 0 // DEPRECATED, it's really not a well known expensive feature
	    case Ctrl('_'):
		// swap editline and currline's data
		if (strcmp(editline, curr_buf->currline->data)) {
		    char            buf[WRAPMARGIN];

		    strlcpy(buf, curr_buf->currline->data, sizeof(buf));
		    strcpy(curr_buf->currline->data, editline);
		    strcpy(editline, buf);
		    curr_buf->currline->len = strlen(curr_buf->currline->data);
		    curr_buf->currpnt = 0;
		    curr_buf->line_dirty = 1;
		}
		break;
#endif
	    case Ctrl('S'):
	    case KEY_F3:
		search_str(0);
		break;
	    case Ctrl('U'):
		insert_char(ESC_CHR);
		break;
	    case Ctrl('V'):	/* Toggle ANSI color */
		curr_buf->ansimode ^= 1;
		if (curr_buf->ansimode && has_block_selection())
		    block_color();
		clear();
		curr_buf->redraw_everything = YEA;
		break;
	    case Ctrl('I'):
		insert_tab();
		break;
	    case '\r':
	    case '\n':
#ifdef MAX_EDIT_LINE
		if( curr_buf->totaln == MAX_EDIT_LINE ){
		    outs("MAX_EDIT_LINE exceed");
		    break;
		}
#endif
		split(curr_buf->currline, curr_buf->currpnt);
		curr_buf->oldcurrline = curr_buf->currline;
		break;
	    case Ctrl('G'):
		{
		    unsigned int    currstat0 = currstat;
		    setutmpmode(EDITEXP);
		    a_menu("編輯輔助器", "etc/editexp",
			   (HasUserPerm(PERM_SYSOP) ? SYSOP : NOBODY),
			   trans_buffer);
		    currstat = currstat0;
		}
		if (trans_buffer[0]) {
		    FILE *fp1;
		    if ((fp1 = fopen(trans_buffer, "r"))) {
			int indent_mode0 = curr_buf->indent_mode;
    			char buf[WRAPMARGIN + 2];

			curr_buf->indent_mode = 0;
			while (fgets(buf, sizeof(buf), fp1)) {
			    if (!strncmp(buf, "作者:", 5) ||
				!strncmp(buf, "標題:", 5) ||
				!strncmp(buf, "時間:", 5))
				continue;
			    insert_string(buf);
			}
			fclose(fp1);
			curr_buf->indent_mode = indent_mode0;
			while (curr_buf->curr_window_line >= b_lines) {
			    curr_buf->curr_window_line--;
			    curr_buf->top_of_win = curr_buf->top_of_win->next;
			}
		    }
		}
		curr_buf->redraw_everything = YEA;
		break;
            case Ctrl('P'):
		phone_mode_switch();
                curr_buf->redraw_everything = YEA;
		break;

	    case KEY_F1:
	    case Ctrl('Z'):	/* Help */
		more("etc/ve.hlp", YEA);
		curr_buf->redraw_everything = YEA;
		break;
	    case Ctrl('L'):
		clear();
		curr_buf->redraw_everything = YEA;
		break;
	    case KEY_LEFT:
		if (curr_buf->currpnt) {
		    if (curr_buf->ansimode)
			curr_buf->currpnt = n2ansi(curr_buf->currpnt, curr_buf->currline);
		    curr_buf->currpnt--;
		    if (curr_buf->ansimode)
			curr_buf->currpnt = ansi2n(curr_buf->currpnt, curr_buf->currline);
#ifdef DBCSAWARE_EDIT
		    if(mbcs_mode)
		      curr_buf->currpnt = fix_cursor(curr_buf->currline->data, curr_buf->currpnt, FC_LEFT);
#endif
		} else if (curr_buf->currline->prev) {
		    curr_buf->curr_window_line--;
		    curr_buf->currln--;
		    curr_buf->currline = curr_buf->currline->prev;
		    curr_buf->currpnt = curr_buf->currline->len;
		}
		break;
	    case KEY_RIGHT:
		if (curr_buf->currline->len != curr_buf->currpnt) {
		    if (curr_buf->ansimode)
			curr_buf->currpnt = n2ansi(curr_buf->currpnt, curr_buf->currline);
		    curr_buf->currpnt++;
		    if (curr_buf->ansimode)
			curr_buf->currpnt = ansi2n(curr_buf->currpnt, curr_buf->currline);
#ifdef DBCSAWARE_EDIT
		    if(mbcs_mode)
		      curr_buf->currpnt = fix_cursor(curr_buf->currline->data, curr_buf->currpnt, FC_RIGHT);
#endif
		} else if (curr_buf->currline->next) {
		    curr_buf->currpnt = 0;
		    curr_buf->curr_window_line++;
		    curr_buf->currln++;
		    curr_buf->currline = curr_buf->currline->next;
		}
		break;
	    case KEY_UP:
		cursor_to_prev_line();
		break;
	    case KEY_DOWN:
		cursor_to_next_line();
		break;

	    case Ctrl('B'):
	    case KEY_PGUP: {
		short tmp = curr_buf->currln;
	   	curr_buf->top_of_win = back_line(curr_buf->top_of_win, 22);
	  	curr_buf->currln = tmp;
	 	curr_buf->currline = back_line(curr_buf->currline, 22);
		curr_buf->curr_window_line = get_lineno_in_window();
		if (curr_buf->currpnt > curr_buf->currline->len)
		    curr_buf->currpnt = curr_buf->currline->len;
		curr_buf->redraw_everything = YEA;
	 	break;
	    }

	    case Ctrl('F'):
	    case KEY_PGDN: {
		short tmp = curr_buf->currln;
		curr_buf->top_of_win = forward_line(curr_buf->top_of_win, 22);
		curr_buf->currln = tmp;
		curr_buf->currline = forward_line(curr_buf->currline, 22);
		curr_buf->curr_window_line = get_lineno_in_window();
		if (curr_buf->currpnt > curr_buf->currline->len)
		    curr_buf->currpnt = curr_buf->currline->len;
		curr_buf->redraw_everything = YEA;
		break;
	    }

	    case KEY_END:
	    case Ctrl('E'):
		curr_buf->currpnt = curr_buf->currline->len;
		break;
	    case Ctrl(']'):	/* start of file */
		curr_buf->currline = curr_buf->top_of_win = curr_buf->firstline;
		curr_buf->currpnt = curr_buf->currln = curr_buf->curr_window_line = 0;
		curr_buf->redraw_everything = YEA;
		break;
	    case Ctrl('T'):	/* tail of file */
		curr_buf->top_of_win = back_line(curr_buf->lastline, 23);
		curr_buf->currline = curr_buf->lastline;
		curr_buf->curr_window_line = get_lineno_in_window();
		curr_buf->currln = curr_buf->totaln;
		curr_buf->redraw_everything = YEA;
		curr_buf->currpnt = 0;
		break;
	    case KEY_HOME:
	    case Ctrl('A'):
		curr_buf->currpnt = 0;
		break;
	    case KEY_INS:	/* Toggle insert/overwrite */
	    case Ctrl('O'):
		if (has_block_selection() && curr_buf->insert_mode) {
		    char            ans[4];

		    getdata(b_lines - 1, 0,
			    "區塊微調右移插入字元(預設為空白字元)",
			    ans, sizeof(ans), LCECHO);
		    curr_buf->insert_c = ans[0] ? ans[0] : ' ';
		}
		curr_buf->insert_mode ^= 1;
		break;
	    case Ctrl('H'):
	    case '\177':	/* backspace */
		if (curr_buf->ansimode) {
		    curr_buf->ansimode = 0;
		    clear();
		    curr_buf->redraw_everything = YEA;
		} else {
		    if (curr_buf->currpnt == 0) {
			textline_t     *p;

			if (!curr_buf->currline->prev)
			    break;
			curr_buf->curr_window_line--;
			curr_buf->currln--;

			curr_buf->currline = adjustline(curr_buf->currline, curr_buf->currline->len);
			curr_buf->currline = curr_buf->currline->prev;
			curr_buf->currline = adjustline(curr_buf->currline, WRAPMARGIN);
			curr_buf->oldcurrline = curr_buf->currline;

			curr_buf->currpnt = curr_buf->currline->len;
			curr_buf->redraw_everything = YEA;
			if (*next_non_space_char(curr_buf->currline->next->data) == '\0') {
			    if (curr_buf->currline->next == curr_buf->top_of_win) {
				delete_line(curr_buf->currline->next, 0);
				curr_buf->top_of_win = curr_buf->currline;
				curr_buf->curr_window_line = 0;
			    }
			    else
				delete_line(curr_buf->currline->next, 0);
			    break;
			}
			p = curr_buf->currline;
			while (!join(p)) {
			    p = p->next;
			    if (p == NULL) {
				indigestion(2);
				abort_bbs(0);
			    }
			}
			break;
		    }
#ifndef DBCSAWARE_EDIT
		    curr_buf->currpnt--;
		    delete_char();
#else
		    {
		      int newpnt = curr_buf->currpnt - 1;

		      if(mbcs_mode)
		        newpnt = fix_cursor(curr_buf->currline->data, newpnt, FC_LEFT);

		      for(; curr_buf->currpnt > newpnt;)
		      {
		        curr_buf->currpnt --;
		        delete_char();
		      }
		    }
#endif
		}
		break;
	    case Ctrl('D'):
	    case KEY_DEL:	/* delete current character */
		if (curr_buf->currline->len == curr_buf->currpnt) {
		    textline_t     *p = curr_buf->currline;

		    while (!join(p)) {
			p = p->next;
			if (p == NULL) {
			    indigestion(2);
			    abort_bbs(0);
			}
		    }
		    curr_buf->redraw_everything = YEA;
		} else {
#ifndef DBCSAWARE_EDIT
		    delete_char();
#else
		    {
		      int w = 1;

		      if(mbcs_mode)
		        w = mchar_len(curr_buf->currline->data + curr_buf->currpnt);

		      for(; w > 0; w --)
		        delete_char();
		    }
#endif
		    if (curr_buf->ansimode)
			curr_buf->currpnt = ansi2n(n2ansi(curr_buf->currpnt, curr_buf->currline), curr_buf->currline);
		}
		break;
	    case Ctrl('Y'):	/* delete current line */
		curr_buf->currline->len = curr_buf->currpnt = 0;
	    case Ctrl('K'):	/* delete to end of line */
		if (curr_buf->currline->len == 0) {
		    textline_t     *p = curr_buf->currline->next;
		    if (!p) {
			p = curr_buf->currline->prev;
			if (!p) {
			    curr_buf->currline->data[0] = 0;
			    break;
			}
			if (curr_buf->curr_window_line > 0) {
			    curr_buf->curr_window_line--;
			}
			curr_buf->currln--;
		    }
		    if (curr_buf->currline == curr_buf->top_of_win)
			curr_buf->top_of_win = p;

		    delete_line(curr_buf->currline, 1);
		    curr_buf->currline = p;
		    curr_buf->redraw_everything = YEA;
		    curr_buf->oldcurrline = curr_buf->currline = adjustline(curr_buf->currline, WRAPMARGIN);
		    break;
		}
		else if (curr_buf->currline->len == curr_buf->currpnt) {
		    textline_t     *p = curr_buf->currline;

		    while (!join(p)) {
			p = p->next;
			if (p == NULL) {
			    indigestion(2);
			    abort_bbs(0);
			}
		    }
		    curr_buf->redraw_everything = YEA;
		    break;
		}
		curr_buf->currline->len = curr_buf->currpnt;
		curr_buf->currline->data[curr_buf->currpnt] = '\0';
		break;
	    }

	    if (curr_buf->currln < 0)
		curr_buf->currln = 0;

	    if (curr_buf->curr_window_line < 0)
		window_scroll_down();
	    else if (cursor_at_bottom_line())
		window_scroll_up();
#ifdef DBCSAWARE_EDIT	    
	    if(mbcs_mode)
	      curr_buf->currpnt = fix_cursor(curr_buf->currline->data, curr_buf->currpnt, FC_LEFT);
#endif
	}

	if (curr_buf->ansimode)
	    tmp = n2ansi(curr_buf->currpnt, curr_buf->currline);
	else
	    tmp = curr_buf->currpnt;

	if (tmp < t_columns - 1)
	    curr_buf->edit_margin = 0;
	else
	    curr_buf->edit_margin = tmp / (t_columns - 8) * (t_columns - 8);

	if (!curr_buf->redraw_everything) {
	    if (curr_buf->edit_margin != curr_buf->last_margin) {
		curr_buf->last_margin = curr_buf->edit_margin;
		curr_buf->redraw_everything = YEA;
	    } else {
		move(curr_buf->curr_window_line, 0);
		clrtoeol();
		if (curr_buf->ansimode)
		    outs(curr_buf->currline->data);
		else
		    edit_outs(&curr_buf->currline->data[curr_buf->edit_margin]);
		edit_msg();
	    }
	} /* redraw */
    } /* main event loop */

    exit_edit_buffer();
}

/* vim:sw=4
 */