source: trunk/minix/commands/elle/eeques.c@ 22

/* ELLE - Copyright 1982, 1987 by Ken Harrenstien, SRI International
 *      This software is quasi-public; it may be used freely with
 *      like software, but may NOT be sold or made part of licensed
 *      products without permission of the author.
 */
/*      EEQUES - Handle queries and status displays
 */
#include "elle.h"

/*
 * Ask -- ask the user for some input on the lowest line of the screen
 * 
 * The arg is a string in printf form, followed by up to three args
 * for the printf string
 *
 *        The string is read into a sort of mini buffer, only the
 *        last line of which is visible on the screen. All editing
 *        features are available to the user to edit the input string.
 *        When the delim character is typed, input is terminated and
 *        The input string is passed back to the caller.
 *        The delim is either an escape or a cr.
 *        IT IS UP TO THE CALLER TO FREE THIS MEMORY.
 *
 * Note that the actual length of the returned string can be found
 * in the global variable ask_len.  This is a crock but allows
 * callers to hack nulls in arg strings if they want to.
 */

int chg_win();
struct window *make_mode();

static int ask_lin;     /* Saved cursor location when ask is done */
static int ask_blen;    /* Non-zero if buffer contains something */
static int ask_cnt;     /* Incremented by ask(), cleared by askclr() */

/* Table of allowed functions during ASK */
static char askftab[] = {
        FN_PFXMETA, FN_INSSELF, FN_BEGLINE, FN_ENDLINE, FN_BCHAR, FN_FCHAR,
        FN_DCHAR, FN_BDCHAR, FN_TCHARS, FN_QUOTINS, FN_UARG, FN_BKPT,
        FN_DEBUG,
        FN_GOBEG, FN_GOEND, FN_FWORD, FN_BWORD, FN_KWORD, FN_BKWORD,
        FN_UCWORD, FN_LCWORD, FN_UCIWORD, FN_ARGDIG, FN_NEWWIN, FN_KLINE,
        FN_UNKILL, FN_BKLINE,
        0
};

char *
ask (string, arg1, arg2, arg3)
char *string, *arg1, *arg2, *arg3;

{       register int i, c;
        register char *s;
        struct window *oldwin;
        char *newline;          /* where output line goes */
        char cbuf[200];                 /* For prompt string creation */
        int p_length;                   /* length of prompt */
        chroff anslen;                  /* Length of answer */
        int funnum;                     /* Crock stuff */
#if FX_FILLMODE
        extern int fill_mode;
        int ofillmode = fill_mode;      /* Gotta turn this one off */
        fill_mode = 0;
#endif /*FX_FILLMODE*/

        oldwin = cur_win;
        chg_win (ask_win);
        ed_reset();                     /* Flush contents & request redisp */
        ask_lin = cur_win->w_pos;       /* Set here in case never redisp */
        ask_cnt++;                      /* Bump # of times called */

        /* copy 'string' into line */
        cbuf[0] = 0;
asklp:  sprintf (&cbuf[strlen(cbuf)], string, arg1, arg2, arg3);
        p_length = strlen(cbuf);        /* Find how long it is */

        /* now let the user type in */
        for(;;)
          {
                if ((rd_type & (RDS_WINFLGS|RD_MODE)) && tinwait () == 0)
                  {
                        e_gobob();      /* Gross crock: insert prompt */
                        e_sputz(cbuf);          /* Ugh, bletch */
                        cur_dot += p_length;    /* Temporarily update loc */
                        redp(RD_WINRES);        /* Do complete re-crunch */
                        upd_wind((struct window *)0);           /* Don't interrupt */
                        /* Ensure mode line is spiffy too.  This should
                        ** only have to be invoked the first time ask_win
                        ** redisplay is done, and never thereafter.
                        */
                        if(rd_type&RD_MODE)     /* If mode also needs it, */
                                fupd_wind(make_mode(user_win)); /* do it */

                        upd_curs(cur_dot);
                        rd_type &= ~(RDS_WINFLGS|RD_MODE);
                        ask_lin = curs_lin;     /* Remember line cursor on */
                        tbufls();

                        e_gobob();      /* More crock: Remove prompt */
                        sb_deln((SBBUF *)cur_buf,(chroff)p_length);     /* Ugh etc. */
                        cur_dot -= p_length;            /* Restore loc */
                        e_gocur();
                  }
                exp = 1;
                exp_p = 0;
        cont:   this_cmd = 0;
                c = cmd_read();

                if (
#if !(ICONOGRAPHICS)
                        c == ESC ||
#endif /*-ICONOGRAPHICS*/
                                 c == LF || c == CR)
                        break;
                if (c == BELL)       /* ^G means punt.. */
                  {     chg_win(oldwin);
                        ask_blen = 1;   /* Assume buffer has something */
                        ding((char *)0);        /* Clear echo window */
                        ask_cnt = 0;    /* Nothing for askclr to do */
#if FX_SKMAC
                        km_abort();
#endif /*FX_SKMAC*/
#if FX_FILLMODE
                        fill_mode = ofillmode;
#endif /*FX_FILLMODE*/
                        return(0);      /* Return 0 to indicate we quit */
                  }
                /* This censoring section is a real crock! */
                funnum = cmd_idx(c);            /* Map key to command */
                while(funnum == FN_PFXMETA)     /* Allow META prefix */
                        funnum = cmd_idx(c = CB_META|cmd_read());
                for(s = askftab; (i = *s&0377); ++s)
                        if(funnum == i) break;
                switch(i)
                  {     default:        /* Permissible function */
                                cmd_xct(c);
                                break;
                        case FN_NEWWIN: /* Wants redisplay, do specially */
                                clear_wind(ask_win);
                                break;
                        case 0:         /* Illegal function */
                                ring_bell();
#if FX_SKMAC
                                km_abort();
#endif /*FX_SKMAC*/
                                continue;
                  }
                if(this_cmd == ARGCMD)
                        goto cont;
          }

        if((anslen = e_blen()) > 255)           /* Ridiculously long? */
          {     strcpy(cbuf,"Huh? Try again - ");
#if FX_SKMAC
                        km_abort();
#endif /*FX_SKMAC*/
                goto asklp;
          }
        i = anslen;
        e_gobob();              /* Go to start of buffer */
        e_sputz(cbuf);          /* Re-insert prompt so buffer == screen */
        ask_blen = i + 1;       /* Say buffer has something in it */

        s = memalloc((SBMO)(i + 1));    /* Allocate fixed loc for answer */
        newline = s;            /* Return ptr to allocated string */
        ask_len = i;            /* And return (via global) length of string */
        if(i) do { *s++ = e_getc(); }
                while(--i);
        *s = '\0';                     /* make sure string terminated */
        chg_win(oldwin);
#if FX_FILLMODE
        fill_mode = ofillmode;
#endif /*FX_FILLMODE*/
        return (newline);              /* return pointer to data */
}

/* ASKCLR - Clears the echo area (but not immediately) if the last thing
**      done to it was an ask() call.  Note that invoking a SAY routine
**      specifically causes this to be a no-op; SAYCLR must be done instead.
*/
askclr()
{
        if(ask_cnt) sayclr();   /* Zap if need be */
}


/* SAY - put up some text on bottom line.
 *      Does this intelligently; text stays up until next SAY or
 *      screen refresh.
 * SAYNOW - like SAY but forces display right away
 * SAYTOO - adds to existing stuff
 * SAYNTOO - ditto but forces output right away.
 * DING - Ring_bell then SAYNOW 
 * DINGTOO - is to DING as SAYNTOO is to SAYNOW.
 * SAYCLR - Clears echo area (but not immediately)
 */
#define SAY_NOW 01      /* Force display immediately */
#define SAY_TOO 02      /* Add to existing stuff */
#define SAY_BEL 04      /* Ding bell prior to text */
#define SAY_LEN 010     /* String length specified by 3rd arg */

say(str)        char *str; {    sayall(str, 0); }
saynow(str)     char *str; {    sayall(str, SAY_NOW); }
saytoo(str)     char *str; {    sayall(str, SAY_TOO); }
sayntoo(str)    char *str; {    sayall(str, SAY_NOW|SAY_TOO); }
ding(str)       char *str; {    sayall(str, SAY_NOW|SAY_BEL); }
dingtoo(str)    char *str; {    sayall(str, SAY_NOW|SAY_TOO|SAY_BEL); }
saylntoo(str,n) char *str; {    sayall(str, SAY_NOW|SAY_TOO|SAY_LEN, n); }
sayclr()                   {    sayall((char *)0, 0); }

sayall(str,flags,len)
char *str;
int flags, len;
{       register struct window *w;
        register f;

        f = flags;
        w = cur_win;

        ask_cnt = 0;                    /* Always reset this */
        if(str == 0 && ask_blen == 0)   /* If clearing, and buff empty */
                return;                 /* nothing to do. */
        chg_win(ask_win);
        if(f&SAY_TOO)
                e_goeob();      /* Add to end of existing stuff */
        else e_reset();         /* Flush previous stuff if any */
        if(str)
          {     if(f&SAY_LEN)           /* Insert string to post up */
                        ed_nsins(str,len);
                else e_sputz(str);
          }
        ask_blen = e_dot();     /* Remember whether buffer has something */

        e_setcur();             /* and remember to set dot */
        if(f&SAY_NOW)
          {     if(f&SAY_BEL)
                        ring_bell();
                redp(RD_WINRES);
                upd_wind((struct window *)0);
                tbufls();
          }
        else redp(RD_WINRES);   /* Set for this window */
        chg_win(w);             /* Back to previous window */

        /* redisplay() does a special check for ask_win->w_redp, so we
        ** don't need to set a global flag like RD_CHKALL.
        */
}


/* YELLAT -- post string on specified line of screen, immediately.
 *      Differs from SAYNOW and SAYNTOO in that NO buffer
 *      manipulation is done; screen image is hacked directly.
 */

yellat(str, line)
char *str;
register int line;
{       register struct scr_line *s;

        s = scr[line];
        strncpy(s->sl_nlin, str, scr_wd0);
        s->sl_ncol = strlen(str);
#if IMAGEN
        s->sl_flg |= SL_REDO;
#endif
        upd_line(line);
        tbufls();
}

/* YELLTOO -- Append string to previous echo line of screen, immediately.
**      Uses the ask_lin variable which is set by ask().
**      Currently this function is only needed for srchint() in EESRCH.
*/
yelltoo(str)
char *str;
{       register int i;
        register struct scr_line *s;
        char nstr[MAXLINE];

        s = scr[ask_lin];
        i = s->sl_col;
        nstr[0] = 0;
        strncat(strncat(nstr, s->sl_line, i),   /* Make new string */
                        str, MAXLINE - i);
        yellat(nstr, ask_lin);                  /* Post it */
}


/* BARF - output a message on the bottom line of the screen,
**      bypassing everything (window, buffer, screen image).
**      Does NOT know about SAY's stuff and does not update it!
**      Use only in dire straits...
** ERRBARF - same but uses a standard error-message prefix.
*/

errbarf(str)
char *str;
{
        barf("\007ELLE Internal Error: ");
        tputz(str);
        tbufls();
}

barf(str)
char *str;
{
        ask_cnt = 0;                    /* Ensure askclr() disabled */
        t_curpos(scr_ht - ECHOLINES, 0);       /* goto echo area */
        t_cleol();
        tputz(str);
        tbufls();
        curs_col = -1000;       /* Say we dunno where cursor is now */
}

#if IMAGEN
/* Same, but do it far from harm's way */
barf2(str)
char *str;
{
        t_curpos (scr_ht - 1, scr_wid - strlen(str) - 8);
        t_cleol ();
        tputz(str);
        tputz(" --M--");
        tbufls();
        tgetc();                        /* Read any char & discard */
        curs_col = -1000;       /* Say we dunno where cursor is now */
}
#endif /*IMAGEN*/