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+ corrected conversion from terminfo rs2 to termcap rs (cf: 980704)
+ make conversion to termcap ug (underline glitch) more consistently applied.
+ modify read_termtype(), fixing 'toe', which could dump core when it
found an incomplete entry such as "dumb" because it did not
initialize its buffer for _nc_read_file_entry().
+ use explicit VALID_NUMERIC() checks in a few places that had been
overlooked, and add a check to ensure that init_tabs is nonzero,
to avoid divide-by-zero (reported by Todd C Miller).

/****************************************************************************
 * Copyright (c) 1998-2000 Free Software Foundation, Inc.                   *
 *                                                                          *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/* $OpenBSD: capdefaults.c,v 1.2 2000/01/02 22:06:50 millert Exp $ */
/* $From: capdefaults.c,v 1.12 2000/01/02 02:34:56 tom Exp $ */

    /*
     * Compute obsolete capabilities.  The reason this is an include file is
     * that the two places where it's needed want the macros to generate
     * offsets to different structures.  See the file Caps for explanations of
     * these conversions.
     *
     * Note:  This code is the functional inverse of the first part of
     * postprocess_termcap().
     */
{
    char *sp;
    int capval;

#define EXTRACT_DELAY(str)	(sp = strchr(str, '*'), sp ? atoi(sp+1) : 0)

    /* current (4.4BSD) capabilities marked obsolete */
    if (VALID_STRING(carriage_return)
	&& (capval = EXTRACT_DELAY(carriage_return)))
	carriage_return_delay = capval;
    if (VALID_STRING(newline) && (capval = EXTRACT_DELAY(newline)))
	new_line_delay = capval;

    /* current (4.4BSD) capabilities not obsolete */
    if (!VALID_STRING(termcap_init2) && VALID_STRING(init_3string)) {
	termcap_init2 = init_3string;
	init_3string = ABSENT_STRING;
    }
    if (!VALID_STRING(termcap_reset)
     && VALID_STRING(reset_2string)
     && !VALID_STRING(reset_1string)
     && !VALID_STRING(reset_3string)) {
	termcap_reset = reset_2string;
	reset_2string = ABSENT_STRING;
    }
    if (magic_cookie_glitch_ul == ABSENT_NUMERIC
	&& magic_cookie_glitch != ABSENT_NUMERIC
	&& VALID_STRING(enter_underline_mode))
	magic_cookie_glitch_ul = magic_cookie_glitch;

    /* totally obsolete capabilities */
    linefeed_is_newline = VALID_STRING(newline)
	&& (strcmp("\n", newline) == 0);
    if (VALID_STRING(cursor_left)
	&& (capval = EXTRACT_DELAY(cursor_left)))
	backspace_delay = capval;
    if (VALID_STRING(tab) && (capval = EXTRACT_DELAY(tab)))
	horizontal_tab_delay = capval;
#undef EXTRACT_DELAY
}