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MIT/X Consortium License

© 2006-2008 Anselm R Garbe <garbeam at gmail dot com>
© 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
© 2006-2007 Jukka Salmi <jukka at salmi dot ch>
© 2007 Premysl Hruby <dfenze at gmail dot com>
© 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
© 2007 Christof Musik <christof at sendfax dot de>
© 2007-2008 Enno Gottox Boland <gottox at s01 dot de>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
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#include "HTUtils.h"
#include "tcp.h"
#include "HTCJK.h"
#include "LYCurses.h"
#include "LYUtils.h"
#include "LYStrings.h"
#include "LYGlobalDefs.h"
#include "GridText.h"
#include "LYKeymap.h"
#include "LYSignal.h"
#include "LYClean.h"

#include <ctype.h>

#include "LYLeaks.h"

#if !defined(FANCY_CURSES) && !defined(NO_KEYPAD)
#define NO_KEYPAD
#endif /* !FANCY_CURSES && !NO_KEYPAD */

#define FREE(x) if (x) {free(x); x = NULL;}

extern BOOL HTPassHighCtrlRaw;
extern HTCJKlang HTCJK;

/*
 * LYstrncpy() terminates strings with a null byte.
 * Writes a null byte into the n+1 byte of dst.
 */
PUBLIC char * LYstrncpy ARGS3(char *,dst, char *,src, int,n)
{
    char *val;
    int len=strlen(src);

    if (n < 0)
        n = 0;

    val = strncpy(dst, src, n);
    if (len < n)
        *(dst+len) = '\0';
    else
        *(dst+n) = '\0';
    return val;
}

#ifdef USE_SLANG
#ifdef VMS
#define GetChar() ttgetc()
#else
#define GetChar (int)SLang_getkey
#endif /* VMS */
#else /* Not slang: */
#ifdef VMS
#define GetChar() ttgetc()
#else
#if defined(SNAKE) || defined(NCURSES)
#define GetChar() wgetch(stdscr)
#else /* everything but VMS, SNAKE and NCURSES */
#ifndef USE_GETCHAR
#define USE_GETCHAR
#endif /* !USE_GETCHAR */
#define GetChar() getchar()  /* used to be "getc(stdin)" and "getch()" */
#endif /* SNAKE || NCURSES */
#endif /* VMS */
#endif /* USE_SLANG */

/*
 * LYgetch() translates some escape sequences and may fake noecho
 */
PUBLIC int LYgetch ()
{
    int a, b, c, d = -1;

#if defined(IGNORE_CTRL_C) || defined(USE_GETCHAR)
re_read:
#endif /* IGNORE_CTRL_C || USE_GETCHAR */
#ifndef USE_SLANG
    clearerr(stdin); /* needed here for ultrix and SOCKETSHR, but why? - FM */
#endif /* !USE_SLANG */
#if !defined(USE_SLANG) || defined(VMS)
    c = GetChar();
#else
    if (LYCursesON) {
	c = GetChar();
    } else {
        c = getchar();
	if (c == EOF && errno == EINTR)	/* Ctrl-Z causes EINTR in getchar() */
	    clearerr(stdin);
	if (feof(stdin) || ferror(stdin) || c == EOF) {
#ifdef IGNORE_CTRL_C
	    if (sigint)
	        sigint = FALSE;
#endif /* IGNORE_CTRL_C */
	    return(7); /* use ^G to cancel whatever called us. */
	}
   }
#endif /* !USE_SLANG || VMS */

#ifdef USE_GETCHAR
    if (c == EOF && errno == EINTR)	/* Ctrl-Z causes EINTR in getchar() */
        goto re_read;
#endif /* USE_GETCHAR */

#ifdef USE_SLANG
    if (c == 0xFFFF && LYCursesON) {
#ifdef IGNORE_CTRL_C
	if (sigint) {
	    sigint = FALSE;
	    goto re_read;
	}
#endif /* IGNORE_CTRL_C */
        return(7); /* use ^G to cancel whatever called us. */
    }
#else
    if (feof(stdin) || ferror(stdin) || c == EOF) {
	if (recent_sizechange)
	    return(7); /* use ^G to cancel whatever called us. */
#ifdef IGNORE_CTRL_C
	if (sigint) {
	    sigint = FALSE;
	    /* clearerr(stdin);  don't need here if stays above - FM */
	    goto re_read;
	}
#endif /* IGNORE_CTRL_C */
	cleanup();
        (void) signal(SIGHUP, SIG_DFL);
        (void) signal(SIGTERM, SIG_DFL);
#ifndef VMS
        (void) signal(SIGINT, SIG_DFL);
#endif /* !VMS */
#ifdef SIGTSTP
	if (no_suspend)
	  (void) signal(SIGTSTP,SIG_DFL);
#endif /* SIGTSTP */
	exit(0);
    }
#endif /* USE_SLANG */

    if (c == 27 || c == 155) {      /* handle escape sequence */
        b = GetChar();

        if (b == '[' || b == 'O') {
            a = GetChar();
        } else {
            a = b;
	}

        switch (a) {
        case 'A': c = UPARROW; break;
        case 'x': c = UPARROW; break;  /* keypad up on pc ncsa telnet */
        case 'B': c = DNARROW; break;
        case 'r': c = DNARROW; break; /* keypad down on pc ncsa telnet */
        case 'C': c = RTARROW; break;
        case 'v': c = RTARROW; break; /* keypad right on pc ncsa telnet */
        case 'D': c = LTARROW; break;
        case 't': c = LTARROW; break; /* keypad left on pc ncsa telnet */
        case 'y': c = PGUP; break;  /* keypad on pc ncsa telnet */
        case 's': c = PGDOWN; break;  /* keypad on pc ncsa telnet */
        case 'w': c = HOME; break;  /* keypad on pc ncsa telnet */
        case 'q': c = END; break;  /* keypad on pc ncsa telnet */
        case 'M': c = '\n'; break; /* kepad enter on pc ncsa telnet */

        case 'm':
#ifdef VMS
            if (b != 'O')
#endif /* VMS */
                c = '-';  /* keypad on pc ncsa telnet */
            break;
	case 'k':
	    if (b == 'O')
		c = '+';  /* keypad + on my xterminal :) */
	    break;
        case 'l':
#ifdef VMS
            if (b != 'O')
#endif /* VMS */
                c = '+';  /* keypad on pc ncsa telnet */
            break;
        case 'P':
#ifdef VMS
            if (b != 'O')
#endif /* VMS */
                c = F1;
            break;
        case 'u':
#ifdef VMS
            if (b != 'O')
#endif /* VMS */
                c = F1;  /* macintosh help button */
            break;
        case '1':                           /** VT300  Find  **/
            if ((b == '[' || c == 155) && (d=GetChar()) == '~')
                c = FIND_KEY;
            break;
	case '2':
	    if (b == '[' || c == 155) {
	        if ((d=GetChar())=='~')     /** VT300 Insert **/
	            c = INSERT_KEY;
	        else if ((d == '8' ||
			  d == '9') &&
			 GetChar() == '~')
	         {
		    if (d == '8')            /** VT300  Help **/
	                c = F1;
	            else if (d == '9')       /** VT300   Do  **/
	                c = DO_KEY;
		    d = -1;
		 }
	    }
	    break;
	case '3':			     /** VT300 Delete **/
	    if ((b == '[' || c == 155) && (d=GetChar()) == '~')
	        c = REMOVE_KEY;
	    break;
        case '4':                            /** VT300 Select **/
            if ((b == '[' || c == 155) && (d=GetChar()) == '~')
                c = SELECT_KEY;
            break;
        case '5':                            /** VT300 PrevScreen **/
            if ((b == '[' || c == 155) && (d=GetChar()) == '~')
                c = PGUP;
            break;
        case '6':                            /** VT300 NextScreen **/
            if ((b == '[' || c == 155) && (d=GetChar()) == '~')
                c = PGDOWN;
            break;
	default:
	   if (TRACE) {
		fprintf(stderr,"Unknown key sequence: %d:%d:%d\n",c,b,a);
		sleep(MessageSecs);
	   }
        }
	if (isdigit(a) && (b == '[' || c == 155) && d != -1 && d != '~')
	    d = GetChar();
#if defined(NO_KEYPAD) || defined(VMS)
    }
#else
    } else {

	/* convert keypad() mode keys into Lynx defined keys
	 */

	switch(c) {
	case KEY_DOWN:	           /* The four arrow keys ... */
	   c=DNARROW;
	   break;
	case KEY_UP:	
	   c=UPARROW;
	   break;
	case KEY_LEFT:	
	   c=LTARROW;
	   break;
	case KEY_RIGHT:	           /* ... */
	   c=RTARROW;
	   break;
	case KEY_HOME:	           /* Home key (upward+left arrow) */
	   c=HOME;
	   break;
	case KEY_CLEAR:	           /* Clear screen */
	   c=18; /* CTRL-R */
	   break;
	case KEY_NPAGE:	           /* Next page */
	   c=PGDOWN;
	   break;
	case KEY_PPAGE:	           /* Previous page */
	   c=PGUP;
	   break;
	case KEY_LL:	           /* home down or bottom (lower left) */
	   c=END;
	   break;
                                        /* The keypad is arranged like this:*/
                                        /*    a1    up    a3   */
                                        /*   left   b2  right  */
                                        /*    c1   down   c3   */
	case KEY_A1:	           /* upper left of keypad */
	   c=HOME;
	   break;
	case KEY_A3:	           /* upper right of keypad */
	   c=PGUP;
	   break;
	case KEY_B2:	           /* center of keypad */
	   c=DO_NOTHING;
	   break;
	case KEY_C1:	           /* lower left of keypad */
	   c=END;
	   break;
	case KEY_C3:	           /* lower right of keypad */
	   c=PGDOWN;
	   break;
#ifdef KEY_END
	case KEY_END:	           /* end key           001 */
	   c=END;
	   break;
#endif /* KEY_END */
#ifdef KEY_HELP
	case KEY_HELP:	           /* help key          001 */
	   c=F1;
	   break;
#endif /* KEY_HELP */
#ifdef KEY_BACKSPACE
	case KEY_BACKSPACE:
	   c=127;		   /* backspace key (delete, not Ctrl-H) */
	   break;
#endif /* KEY_BACKSPACE */
	}
    }
#endif /* defined(NO_KEYPAD) || defined(VMS) */

    return(c);
}


/*
 * display the current value of the string and allow the user
 * to edit it.
 */

#ifdef USE_SLANG
#define GetYX(y,x)   y = SLsmg_get_row(), x = SLsmg_get_column()
#else
#ifdef getyx
#define GetYX(y,x)   getyx(stdscr,y,x)
#else
#define GetYX(y,x)   y = stdscr->_cury, x = stdscr->_curx
#endif /* getyx */
#endif /* USE_SLANG */

#define EDREC    EditFieldData

/* shorthand to get rid of all most of the "edit->suchandsos" */
#define Buf      edit->buffer
#define Pos      edit->pos
#define StrLen   edit->strlen
#define MaxLen   edit->maxlen
#define DspWdth  edit->dspwdth
#define DspStart edit->xpan
#define Margin   edit->margin

PUBLIC void LYSetupEdit ARGS4(EDREC *,edit, char *,old, int,maxstr, int,maxdsp)
{
    /* Initialize edit record */

    GetYX(edit->sy, edit->sx);
    edit->pad   = ' ';
    edit->dirty = TRUE;
    edit->panon = FALSE;

    StrLen  = strlen(old);
    MaxLen  = maxstr;
    DspWdth = maxdsp;
    Margin  = 0;
    Pos = strlen(old);
    DspStart = 0;

    if (maxstr > maxdsp) {  /* Need panning? */
        if (DspWdth > 4)    /* Else "{}" take up precious screen space */
	    edit->panon = TRUE;

	/* Figure out margins. If too big we do a lot of unnecessary
	 * scrolling. If too small user doesn't have sufficient look-ahead.
	 * Let's say 25% for each margin, upper bound is 10 columns.
	 */
	Margin = DspWdth/4;
	if (Margin > 10)
	    Margin = 10;
    }
    strcpy(edit->buffer, old);
}

PUBLIC int LYEdit1 ARGS4(EDREC *,edit, int,ch, int,action, BOOL,maxMessage)
{   /* returns 0    character processed
     *         ch   otherwise
     */

    int i;
    int length;

    if (MaxLen <= 0)
        return(0); /* Be defensive */

    length=strlen(&Buf[0]);
    StrLen = length;

    switch (action) {
    case LYE_AIX:
        /*
	 * Hex 97.
	 * Fall through as a character for CJK.
	 * Otherwise, we treat this as LYE_ENTER.
	 */
	 if (HTCJK == NOCJK)
	     return(ch);
    case LYE_CHAR:
        /*
	 * ch is printable or ISO-8859-1 escape character.
	 */
	if (Pos <= (MaxLen) && StrLen < (MaxLen)) {
	    for(i = length; i >= Pos; i--)    /* Make room */
		Buf[i+1] = Buf[i];
	    Buf[length+1]='\0';
	    Buf[Pos] = (unsigned char) ch;
	    Pos++;
	} else if (maxMessage) {
	    _statusline(MAXLEN_REACHED_DEL_OR_MOV);
	}
	break;

    case LYE_BACKW:
        /*
	 * Backword.
	 * Definition of word is very naive: 1 or more a/n characters.
	 */
	while (Pos && !isalnum(Buf[Pos-1]))
	    Pos--;
	while (Pos &&  isalnum(Buf[Pos-1]))
	    Pos--;
	break;

    case LYE_FORWW:
        /*
	 * Word forward.
	 */
	while (isalnum(Buf[Pos]))
	    Pos++;   /* '\0' is not a/n */
	while (!isalnum(Buf[Pos]) && Buf[Pos])
	    Pos++ ;
	break;

    case LYE_ERASE:
        /*
	 * Erase the line to start fresh.
	 */
	 Buf[0] = '\0';
	 /* fall through */

    case LYE_BOL:
        /*
	 * Go to first column.
	 */
	Pos = 0;
	break;

    case LYE_EOL:
        /*
	 * Go to last column.
	 */
	Pos = length;
	break;

    case LYE_DELNW:
        /*
	 * Delete next word.
	 */
	{
	    int pos0 = Pos;
	    LYEdit1 (edit, 0, LYE_FORWW, FALSE);
	    while (Pos > pos0)
	        LYEdit1(edit, 0, LYE_DELP, FALSE);
	}
	break;

    case LYE_DELPW:
        /*
	 * Delete previous word.
	 */
	{
	    int pos0 = Pos;
	    LYEdit1 (edit, 0, LYE_BACKW, FALSE);
	    pos0 -= Pos;
	    while (pos0--)
	        LYEdit1(edit, 0, LYE_DELN, FALSE);
	}
	break;

    case LYE_DELN:
        /*
	 * Delete next character
	 */
	if (Pos >= length)
	    break;
	Pos++;
	/* fall through */

    case LYE_DELP:
        /*
	 * Delete preceding character.
	 */
	if (length == 0 || Pos == 0)
	    break;
	Pos--;
	for (i = Pos; i < length; i++)
	    Buf[i] = Buf[i+1];
	i--;
	Buf[i] = 0;
	break;

    case LYE_DELC:
        /*
	 * Delete current character.
	 */
	if (length == 0)
	    break;
	for (i = Pos; i < length; i++)
	    Buf[i] = Buf[i+1];
	i--;
	Buf[i] = 0;
	break;

    case LYE_FORW:
        /*
	 * Move cursor to the right.
	 */
	if (Pos < length)
	    Pos++;
	break;

    case LYE_BACK:
        /*
	 * Left-arrow move cursor to the left.
	 */
	if (Pos > 0)
	    Pos--;
	break;

    case LYE_UPPER:
	for (i = 0; Buf[i]; i++)
	   Buf[i] = TOUPPER(Buf[i]);
	break;

    case LYE_LOWER:
	for (i = 0; Buf[i]; i++)
	   Buf[i] = TOLOWER(Buf[i]);
	break;

    default:
	return(ch);
    }
    edit->dirty = TRUE;
    StrLen = strlen(&Buf[0]);
    return(0);
}


PUBLIC void LYRefreshEdit ARGS1(EDREC *,edit)
{
    int i;
    int length;
    int nrdisplayed;
    int padsize;
    char *str;
    char buffer[3];

    buffer[0] = buffer[1] = buffer[2] = '\0';
    if (!edit->dirty || (DspWdth == 0))
        return;
    edit->dirty = FALSE;

    length=strlen(&Buf[0]);
    edit->strlen = length;
/*
 *  Now we have:
 *                .--DspWdth---.
 *      +---------+=============+-----------+
 *      |         |M           M|           |   (M=margin)
 *      +---------+=============+-----------+
 *      0         DspStart                   length
 *
 *  Insertion point can be anywhere beween 0 and stringlength.
 *  Figure out new display starting point.
 *
 *   The first "if" below makes Lynx scroll several columns at a time when
 *   extending the string. Looks awful, but that way we can keep up with
 *   data entry at low baudrates.
 */
    if ((DspStart + DspWdth) <= length)
        if (Pos >= (DspStart + DspWdth) - Margin)
	    DspStart=(Pos - DspWdth) + Margin;

    if (Pos < DspStart + Margin) {
        DspStart = Pos - Margin;
	if (DspStart < 0)
	    DspStart = 0;
    }

    str = &Buf[DspStart];

    nrdisplayed = length-DspStart;
    if (nrdisplayed > DspWdth)
        nrdisplayed = DspWdth;

    move(edit->sy, edit->sx);
    if (edit->hidden) {
        for (i = 0; i < nrdisplayed; i++)
	    addch('*');
    } else {
        for (i = 0; i < nrdisplayed; i++)
	    if ((buffer[0] = str[i]) == 1 || buffer[0] == 2 ||
	        ((unsigned char)buffer[0] == 160 &&
		 !(HTPassHighCtrlRaw || HTCJK != NOCJK))) {
	        addch(' ');
	    } else {
		/* For CJK strings, by Masanobu Kimura */
		if (HTCJK != NOCJK && !isascii(buffer[0])) {
		    if (i < (nrdisplayed - 1))
		        buffer[1] = str[++i];
		    addstr(buffer);
		    buffer[1] = '\0';
		} else {
		    addstr(buffer);
		}
	    }
    }

    /*
     * Erase rest of input area.
     */
    padsize= DspWdth-nrdisplayed;
    while (padsize--)
        addch((unsigned char)edit->pad);

    /*
     * Scrolling indicators.
     */
    if (edit->panon) {
        if ((DspStart + nrdisplayed) < length) {
	    move(edit->sy, edit->sx+nrdisplayed-1);
	    addch('}');
	}
	if (DspStart) {
	    move(edit->sy, edit->sx);
	    addch('{');
	}
    }

    move(edit->sy, edit->sx + Pos - DspStart);
    refresh();
}


PUBLIC int LYgetstr ARGS4(char *,inputline, int,hidden,
			  int,bufsize, int,recall)
{
    extern BOOLEAN term_letter;     /* Flag from terminate_letter() AST  */
    extern BOOLEAN term_options;    /* Flag from terminate_options() AST */
    extern BOOLEAN term_message;    /* Flag from terminate_message() AST */
#ifdef VMS
    extern BOOLEAN HadVMSInterrupt; /* Flag from cleanup_sig() AST       */
#endif
    int x, y, MaxStringSize;
    int ch;
    EditFieldData MyEdit;

    GetYX(y,x);                 /* Use screen from cursor position to eol */
    MaxStringSize = (bufsize < sizeof(MyEdit.buffer)) ?
    		    (bufsize - 1) : (sizeof(MyEdit.buffer) - 1);
    LYSetupEdit(&MyEdit, inputline, MaxStringSize, (LYcols-1)-x);
    MyEdit.hidden = hidden ;

    for (;;) {
again:
        LYRefreshEdit(&MyEdit);
        ch = LYgetch();
#ifdef VMS
	if (term_letter || term_options || term_message || HadVMSInterrupt) {
	    HadVMSInterrupt = FALSE;
	    ch = 7;
	}
#else
	if (term_letter || term_options || term_message)
	    ch = 7;
#endif /* VMS */
	if (recall && (ch == UPARROW || ch == DNARROW)) {
	    strcpy(inputline, MyEdit.buffer);
	    return(ch);
	}
	if (keymap[ch + 1] == LYK_REFRESH)
	    goto again;
        switch (EditBinding(ch)) {
	case LYE_TAB:
	    ch = '\t';
	    /* fall through */
	case LYE_AIX:
	    /*
	     * Hex 97.
	     * Treat as a character for CJK.
	     * Otherwise, we treat this as LYE_ENTER.
	     */
	    if (HTCJK != NOCJK && ch != '\t') {
	        LYLineEdit(&MyEdit,ch, FALSE);
		break;
	    }
	case LYE_ENTER:
	    /*
	     * Terminate the string and return.
	     */
	    strcpy(inputline, MyEdit.buffer);
            return(ch);
	    break;

        case LYE_ABORT:
	    /*
	     * Control-C or Control-G aborts.
	     */
	    inputline[0] = '\0';		   
	    return(-1);
            break;

        default:
            LYLineEdit(&MyEdit,ch, FALSE);
        }
    }
}

/*
 * LYstrstr will find the first occurence of the string pointed to by tarptr
 * in the string pointed to by chptr.  
 * It is a case insensitive search.
 */
PUBLIC char * LYstrstr ARGS2(char *,chptr, char *,tarptr)
{
    register char *tmpchptr, *tmptarptr;

    for(; *chptr != '\0'; chptr++) {
	if(TOUPPER(*chptr) == TOUPPER(*tarptr)) {	
	    /* see if they line up */ 
	    for(tmpchptr = chptr+1, tmptarptr = tarptr+1;
	        (TOUPPER(*tmpchptr) == TOUPPER(*tmptarptr) &&
		 *tmptarptr != '\0' && *tmpchptr != '\0');
	        tmpchptr++, tmptarptr++)
		   ; /* null body */ 
	    if(*tmptarptr == '\0') 
	  	return(chptr);
	}
    } /* end for */

    return(NULL);
}	

/*
 * LYno_attr_char_case_strstr will find the first occurence of the string 
 * pointed to by tarptr in the string pointed to by chptr.
 * It ignores the characters: LY_UNDERLINE_START_CHAR and
 * 			      LY_UNDERLINE_END_CHAR
 * 			      LY_BOLD_START_CHAR
 * 			      LY_BOLD_END_CHAR[B
 *			      if present in chptr.
 * It is a case insensitive search.
 */
PUBLIC char * LYno_attr_char_case_strstr ARGS2(char *,chptr, char *,tarptr)
{
    register char *tmpchptr, *tmptarptr;

    if (!chptr)
        return(NULL);

    while (IsSpecialAttrChar(*chptr) && *chptr != '\0')
        chptr++;

    for (; *chptr != '\0'; chptr++) {

        if (TOUPPER(*chptr) == TOUPPER(*tarptr)) {

            /* see if they line up */
	    tmpchptr = chptr+1;
	    tmptarptr = tarptr+1;

	    if (*tmptarptr == '\0')  /* one char target */
		 return(chptr);

	    while (1) {
		 if (!IsSpecialAttrChar(*tmpchptr)) {

                    if (TOUPPER(*tmpchptr) != TOUPPER(*tmptarptr))
			break;

		    tmpchptr++;
		    tmptarptr++;

		 } else {
		    tmpchptr++;
		 }

                 if (*tmptarptr == '\0')
		     return(chptr);

		 if (*tmpchptr == '\0')
		     break;
	    }
        }
    } /* end for */

    return(NULL);
}

/*
 * LYno_attr_char_strstr will find the first occurence of the string
 * pointed to by tarptr in the string pointed to by chptr.
 * It ignores the characters: LY_UNDERLINE_START_CHAR and
 *                            LY_UNDERLINE_END_CHAR
 *                            LY_BOLD_START_CHAR
 *                            LY_BOLD_END_CHAR
 *			      if present in chptr.
 * It is a case sensitive search.
 */
PUBLIC char * LYno_attr_char_strstr ARGS2(char *,chptr, char *,tarptr)
{
    register char *tmpchptr, *tmptarptr;

    if (!chptr)
        return(NULL);

    while (IsSpecialAttrChar(*chptr) && *chptr != '\0')
        chptr++;

    for (; *chptr != '\0'; chptr++) {

        if ((*chptr) == (*tarptr)) {

            /* see if they line up */
            tmpchptr = chptr+1;
            tmptarptr = tarptr+1;

	    if (*tmptarptr == '\0')  /* one char target */
		 return(chptr);

            while (1) {
		 if (!IsSpecialAttrChar(*tmpchptr)) {

                    if ((*tmpchptr) != (*tmptarptr))
                        break;

                    tmpchptr++;
                    tmptarptr++;

                 } else {
                    tmpchptr++;
                 }

                 if (*tmptarptr == '\0')
                     return(chptr);

                 if (*tmpchptr == '\0')
                     break;
            }
        }
    } /* end for */

    return(NULL);
}

/*      Allocate a new copy of a string, and returns it
*/
PUBLIC char * SNACopy ARGS3 (char **,dest, CONST char *,src, int,n)
{
  FREE(*dest);
  if (src) {
    *dest = (char *) calloc (1, n + 1);
    if (*dest == NULL) {
	fprintf(stderr,"Tried to calloc %d bytes\n",n);
	outofmem(__FILE__, "SNACopy");
    }
    strncpy (*dest, src, n);
    *(*dest + n) = '\0'; /* terminate */
  }
  return *dest;
}

/*      String Allocate and Concatenate
*/
PUBLIC char * SNACat ARGS3 (char **,dest, CONST char *,src, int,n)
{
  if (src && *src) {
    if (*dest) {
      int length = strlen (*dest);
      *dest = (char *) realloc (*dest, length + n + 1);
      if (*dest == NULL)
          outofmem(__FILE__, "SNACat");
      strncpy (*dest + length, src, n);
      *(*dest + length + n) = '\0'; /* terminate */
    } else {
      *dest = (char *) calloc (1, strlen(src) + 1);
      if (*dest == NULL)
          outofmem(__FILE__, "SNACat");
      strncpy (*dest, src, n);
      *dest[n] = '\0'; /* terminate */
    }
  }
  return *dest;
}