path: root/mbbsd/edit.c

/* $Id$ */
/**
 * 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
 */