NetBSD/lib/libcurses/setterm.c

/*	$NetBSD: setterm.c,v 1.27 2000/12/19 21:34:24 jdc Exp $	*/

/*
 * Copyright (c) 1981, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)setterm.c	8.8 (Berkeley) 10/25/94";
#else
__RCSID("$NetBSD: setterm.c,v 1.27 2000/12/19 21:34:24 jdc Exp $");
#endif
#endif /* not lint */

#include <sys/ioctl.h>		/* TIOCGWINSZ on old systems. */

#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "curses.h"
#include "curses_private.h"

static int zap(struct tinfo *tinfo);

struct tinfo *_cursesi_genbuf;

static char	*sflags[] = {
		/*	      am        bs        cc        da        eo  */
			&__tc_am, &__tc_bs, &__tc_cc, &__tc_da, &__tc_eo,
		/*	      hc        hl        in        mi        ms  */
			&__tc_hc, &__tc_hl, &__tc_in, &__tc_mi, &__tc_ms,
		/*	      nc        ns        os        ul        ut  */
			&__tc_nc, &__tc_ns, &__tc_os, &__tc_ul, &__tc_ut,
		/*	      xb        xn        xt        xs        xx  */
			&__tc_xb, &__tc_xn, &__tc_xt, &__tc_xs, &__tc_xx
		};

static int	*svals[] = {
		/*	      pa        Co        NC  */
			&__tc_pa, &__tc_Co, &__tc_NC
		};
static char	*_PC,
		**sstrs[] = {
		/*	      AB        ac        ae        AF        AL  */
			&__tc_AB, &__tc_ac, &__tc_ae, &__tc_AF, &__tc_AL,
		/*	      al        as        bc        bl        bt  */
			&__tc_al, &__tc_as, &__tc_bc, &__tc_bl, &__tc_bt,
		/*	      cd        ce        cl        cm        cr  */
			&__tc_cd, &__tc_ce, &__tc_cl, &__tc_cm, &__tc_cr,
		/*	      cs        dc        DL        dl        dm  */
			&__tc_cs, &__tc_dc, &__tc_DL, &__tc_dl, &__tc_dm,
		/*	      DO        do        eA        ed        ei  */
			&__tc_DO, &__tc_do, &__tc_eA, &__tc_ed, &__tc_ei,
		/*	      ho        Ic        ic        im        Ip  */
			&__tc_ho, &__tc_Ic, &__tc_ic, &__tc_im, &__tc_Ip,
		/*	      ip        k0        k1        k2        k3  */
			&__tc_ip, &__tc_k0, &__tc_k1, &__tc_k2, &__tc_k3,
		/*	      k4        k5        k6        k7        k8  */
			&__tc_k4, &__tc_k5, &__tc_k6, &__tc_k7, &__tc_k8,
		/*	      k9        kd        ke        kh        kl  */
			&__tc_k9, &__tc_kd, &__tc_ke, &__tc_kh, &__tc_kl,
		/*	      kr        ks        ku        LE        ll  */
			&__tc_kr, &__tc_ks, &__tc_ku, &__tc_LE, &__tc_ll,
		/*	      ma        mb        md        me        mh  */
			&__tc_ma, &__tc_mb, &__tc_md, &__tc_me, &__tc_mh,
		/*	      mk        mm        mo        mp        mr  */
			&__tc_mk, &__tc_mm, &__tc_mo, &__tc_mp, &__tc_mr,
		/*	      nd        nl        oc        op    pc      */
			&__tc_nd, &__tc_nl, &__tc_oc, &__tc_op, &_PC,
		/*	      rc        RI        sc        Sb        se  */
			&__tc_rc, &__tc_RI, &__tc_Sb, &__tc_sc, &__tc_se,
		/*	      SF        Sf        sf        so        sp  */
			&__tc_SF, &__tc_Sf, &__tc_sf, &__tc_so, &__tc_sp,
		/*	      SR        sr        ta        te        ti  */
			&__tc_SR, &__tc_sr, &__tc_ta, &__tc_te, &__tc_ti,
		/*	      uc        ue        UP        up        us  */
			&__tc_uc, &__tc_ue, &__tc_UP, &__tc_up, &__tc_us,
		/*	      vb        ve        vi        vs            */
			&__tc_vb, &__tc_ve, &__tc_vi, &__tc_vs
		};

static char	*aoftspace;		/* Address of _tspace for relocation */
static char	*tspace;		/* Space for capability strings */
static size_t   tspace_size;            /* size of tspace */

char	*ttytype;
attr_t	 __mask_op, __mask_me, __mask_ue, __mask_se;

int
setterm(char *type)
{
	static char __ttytype[128], cm_buff[1024], tc[1024], *tcptr;
	int unknown;
	size_t limit;
	struct winsize win;
	char *p;

#ifdef DEBUG
	__CTRACE("setterm: (\"%s\")\nLINES = %d, COLS = %d\n",
	    type, LINES, COLS);
#endif
	if (type[0] == '\0')
		type = "xx";
	unknown = 0;
	if (t_getent(&_cursesi_genbuf, type) != 1) {
		unknown++;
	}
#ifdef DEBUG
	__CTRACE("setterm: tty = %s\n", type);
#endif

	/* Try TIOCGWINSZ, and, if it fails, the termcap entry. */
	if (ioctl(STDERR_FILENO, TIOCGWINSZ, &win) != -1 &&
	    win.ws_row != 0 && win.ws_col != 0) {
		LINES = win.ws_row;
		COLS = win.ws_col;
	}  else {
		if (unknown) {
			LINES = -1;
			COLS = -1;
		} else {
			LINES = t_getnum(_cursesi_genbuf, "li");
			COLS = t_getnum(_cursesi_genbuf, "co");
		}
		
	}

	/* POSIX 1003.2 requires that the environment override. */
	if ((p = getenv("LINES")) != NULL)
		LINES = (int) strtol(p, NULL, 10);
	if ((p = getenv("COLUMNS")) != NULL)
		COLS = (int) strtol(p, NULL, 10);

	/*
	 * Want cols > 4, otherwise things will fail.
	 */
	if (COLS <= 4)
		return (ERR);

#ifdef DEBUG
	__CTRACE("setterm: LINES = %d, COLS = %d\n", LINES, COLS);
#endif
	if (!unknown) {
		if (zap(_cursesi_genbuf) == ERR) /* Get terminal description.*/
			return ERR;
	}
	
	/* If we can't tab, we can't backtab, either. */
	if (!__GT)
		__tc_bt = NULL;

	/*
	 * Test for cursor motion capability.
	 *
	 */
	if (t_goto(NULL, __tc_cm, 0, 0, cm_buff, 1023) < 0) {
		__CA = 0;
		__tc_cm = 0;
	} else
		__CA = 1;

	__tc_pc = _PC ? _PC[0] : 0;
	aoftspace = tspace;
	if (unknown) {
		strcpy(ttytype, "dumb");
	} else {
		tcptr = tc;
		limit = 1023;
		if (t_getterm(_cursesi_genbuf, &tcptr, &limit) < 0)
			return ERR;
		ttytype = __longname(tc, __ttytype);
	}
	
	/* If no scrolling commands, no quick change. */
	__noqch =
  	    (__tc_cs == NULL || __tc_ho == NULL ||
	    (__tc_SF == NULL && __tc_sf == NULL) || (__tc_SR == NULL && __tc_sr == NULL)) &&
	    ((__tc_AL == NULL && __tc_al == NULL) || (__tc_DL == NULL && __tc_dl == NULL));

	/* Precalculate conflict info for color/attribute end commands. */
	__mask_op = __ATTRIBUTES & ~__COLOR;
	if (__tc_op != NULL) {
		if (__tc_se != NULL && !strcmp(__tc_op, __tc_se))
			__mask_op &= ~__STANDOUT;
		if (__tc_ue != NULL && !strcmp(__tc_op, __tc_ue))
			__mask_op &= ~__UNDERSCORE;
		if (__tc_me != NULL && !strcmp(__tc_op, __tc_me))
			__mask_op &= ~__TERMATTR;
	}
	__mask_me = __ATTRIBUTES & ~__TERMATTR;
	if (__tc_me != NULL) {
		if (__tc_se != NULL && !strcmp(__tc_me, __tc_se))
			__mask_me &= ~__STANDOUT;
		if (__tc_ue != NULL && !strcmp(__tc_me, __tc_ue))
			__mask_me &= ~__UNDERSCORE;
		if (__tc_op != NULL && !strcmp(__tc_me, __tc_op))
			__mask_me &= ~__COLOR;
	}
	__mask_ue = __ATTRIBUTES & ~__UNDERSCORE;
	if (__tc_ue != NULL) {
		if (__tc_se != NULL && !strcmp(__tc_ue, __tc_se))
			__mask_ue &= ~__STANDOUT;
		if (__tc_me != NULL && !strcmp(__tc_ue, __tc_me))
			__mask_ue &= ~__TERMATTR;
		if (__tc_op != NULL && !strcmp(__tc_ue, __tc_op))
			__mask_ue &= ~__COLOR;
	}
	__mask_se = __ATTRIBUTES & ~__STANDOUT;
	if (__tc_se != NULL) {
		if (__tc_ue != NULL && !strcmp(__tc_se, __tc_ue))
			__mask_se &= ~__UNDERSCORE;
		if (__tc_me != NULL && !strcmp(__tc_se, __tc_me))
			__mask_se &= ~__TERMATTR;
		if (__tc_op != NULL && !strcmp(__tc_se, __tc_op))
			__mask_se &= ~__COLOR;
	}

	return (unknown ? ERR : OK);
}

/*
 * zap --
 *	Gets all the terminal flags from the termcap database.
 */
static int
zap(struct tinfo *tinfo)
{
	const char *nampstr, *namp;
        char ***sp;
	int  **vp;
	char **fp;
	char tmp[3];
	size_t i;
#ifdef DEBUG
	char	*cp;
#endif
	tmp[2] = '\0';

	namp = "ambsccdaeohchlinmimsncnsosulutxbxnxtxsxx";
	fp = sflags;
	do {
		*tmp = *namp;
		*(tmp + 1) = *(namp + 1);
		*(*fp++) = t_getflag(tinfo, tmp);
#ifdef DEBUG
		__CTRACE("%2.2s = %s\n", namp, *fp[-1] ? "TRUE" : "FALSE");
#endif
		namp += 2;

	} while (*namp);
	namp = "paCoNC";
	vp = svals;
	do {
		*tmp = *namp;
		*(tmp + 1) = *(namp + 1);
		*(*vp++) = t_getnum(tinfo, tmp);
#ifdef DEBUG
		__CTRACE("%2.2s = %d\n", namp, *vp[-1]);
#endif
		namp += 2;

	} while (*namp);

	  /* calculate the size of tspace.... */
	nampstr = "ABacaeAFALalasbcblbtcdceclcmcrcsdcDLdldmDOdoeAedeihoIcicimIpipk0k1k2k3k4k5k6k7k8k9kdkekhklkrkskuLEllmambmdmemhmkmmmompmrndnlocoppcrcRISbscseSFSfsfsospSRsrtatetiucueUPupusvbvevivs";
	namp = nampstr;
	tspace_size = 0;
	do {
		*tmp = *namp;
		*(tmp + 1) = *(namp + 1);
		t_getstr(tinfo, tmp, NULL, &i);
		tspace_size += i + 1;
		namp += 2;
	} while (*namp);

	if ((tspace = (char *) malloc(tspace_size)) == NULL)
		return ERR;
#ifdef DEBUG
	__CTRACE("Allocated %d (0x%x) size buffer for tspace\n", tspace_size,
		 tspace_size);
#endif
	aoftspace = tspace;
	
	namp = nampstr;
	sp = sstrs;
	do {
		*tmp = *namp;
		*(tmp + 1) = *(namp + 1);
		*(*sp++) = t_getstr(tinfo, tmp, &aoftspace, NULL);
#ifdef DEBUG
		__CTRACE("%2.2s = %s", namp, *sp[-1] == NULL ? "NULL\n" : "\"");
		if (*sp[-1] != NULL) {
			for (cp = *sp[-1]; *cp; cp++)
				__CTRACE("%s", unctrl(*cp));
			__CTRACE("\"\n");
		}
#endif
		namp += 2;
	} while (*namp);
	if (__tc_xs)
		__tc_so = __tc_se = NULL;
	else {
		if (t_getnum(tinfo, "sg") > 0)
			__tc_so = NULL;
		if (t_getnum(tinfo, "ug") > 0)
			__tc_us = NULL;
		if (!__tc_so && __tc_us) {
			__tc_so = __tc_us;
			__tc_se = __tc_ue;
		}
	}

	return OK;
}

/*
 * getcap --
 *	Return a capability from termcap.
 */
char	*
getcap(char *name)
{
	size_t ent_size, offset;
	char *new_tspace;

	  /* verify cap exists and grab size of it at the same time */
	t_getstr(_cursesi_genbuf, name, NULL, &ent_size);

	  /* grow tspace to hold the new cap */
	if ((new_tspace = realloc(tspace, ent_size + tspace_size)) == NULL)
		return NULL;

	  /* point aoftspace to the same place in the newly allocated buffer */
	offset = aoftspace - tspace;
	tspace = new_tspace + offset;
	
	return (t_getstr(_cursesi_genbuf, name, &aoftspace, NULL));
}