term.c

asterisk 是一个很有知名度开源软件

/*	$NetBSD: term.c,v 1.35 2002/03/18 16:00:59 christos Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * 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 "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)term.c	8.2 (Berkeley) 4/30/95";
#else
__RCSID("$NetBSD: term.c,v 1.35 2002/03/18 16:00:59 christos Exp $");
#endif
#endif /* not lint && not SCCSID */

/*
 * term.c: Editor/termcap-curses interface
 *	   We have to declare a static variable here, since the
 *	   termcap putchar routine does not take an argument!
 */
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_TERMCAP_H
#include <termcap.h>
#endif
#ifdef HAVE_CURSES_H
#include <curses.h>
#endif
#ifdef HAVE_NCURSES_H
#include <ncurses.h>
#endif
#if defined(HAVE_TERM_H)
#include "term.h"
/* Can not use /usr/include/term.h because of a lot of incompatibilities, so just define some prototypes */
extern int tgetent(char *, const char *);
extern int tgetflag(const char *);
extern int tgetnum(const char *);
extern char *tgetstr(const char *, char **);
extern int tputs (const char *, int, int (*)(int));
extern char *tgoto (const char *, int, int);
#endif /* defined(HAVE_TERM_H) */
#include <sys/types.h>
#include <sys/ioctl.h>

#include "el.h"

/*
 * IMPORTANT NOTE: these routines are allowed to look at the current screen
 * and the current possition assuming that it is correct.  If this is not
 * true, then the update will be WRONG!  This is (should be) a valid
 * assumption...
 */

#define	TC_BUFSIZE	2048

#define	GoodStr(a)	(el->el_term.t_str[a] != NULL && \
			    el->el_term.t_str[a][0] != '\0')
#define	Str(a)		el->el_term.t_str[a]
#define	Val(a)		el->el_term.t_val[a]

#ifdef notdef
private const struct {
	const char *b_name;
	int b_rate;
} baud_rate[] = {
#ifdef B0
	{ "0", B0 },
#endif
#ifdef B50
	{ "50", B50 },
#endif
#ifdef B75
	{ "75", B75 },
#endif
#ifdef B110
	{ "110", B110 },
#endif
#ifdef B134
	{ "134", B134 },
#endif
#ifdef B150
	{ "150", B150 },
#endif
#ifdef B200
	{ "200", B200 },
#endif
#ifdef B300
	{ "300", B300 },
#endif
#ifdef B600
	{ "600", B600 },
#endif
#ifdef B900
	{ "900", B900 },
#endif
#ifdef B1200
	{ "1200", B1200 },
#endif
#ifdef B1800
	{ "1800", B1800 },
#endif
#ifdef B2400
	{ "2400", B2400 },
#endif
#ifdef B3600
	{ "3600", B3600 },
#endif
#ifdef B4800
	{ "4800", B4800 },
#endif
#ifdef B7200
	{ "7200", B7200 },
#endif
#ifdef B9600
	{ "9600", B9600 },
#endif
#ifdef EXTA
	{ "19200", EXTA },
#endif
#ifdef B19200
	{ "19200", B19200 },
#endif
#ifdef EXTB
	{ "38400", EXTB },
#endif
#ifdef B38400
	{ "38400", B38400 },
#endif
	{ NULL, 0 }
};
#endif

private const struct termcapstr {
	const char *name;
	const char *long_name;
} tstr[] = {
#define	T_al	0
	{ "al", "add new blank line" },
#define	T_bl	1
	{ "bl", "audible bell" },
#define	T_cd	2
	{ "cd", "clear to bottom" },
#define	T_ce	3
	{ "ce", "clear to end of line" },
#define	T_ch	4
	{ "ch", "cursor to horiz pos" },
#define	T_cl	5
	{ "cl", "clear screen" },
#define	T_dc	6
	{ "dc", "delete a character" },
#define	T_dl	7
	{ "dl", "delete a line" },
#define	T_dm	8
	{ "dm", "start delete mode" },
#define	T_ed	9
	{ "ed", "end delete mode" },
#define	T_ei	10
	{ "ei", "end insert mode" },
#define	T_fs	11
	{ "fs", "cursor from status line" },
#define	T_ho	12
	{ "ho", "home cursor" },
#define	T_ic	13
	{ "ic", "insert character" },
#define	T_im	14
	{ "im", "start insert mode" },
#define	T_ip	15
	{ "ip", "insert padding" },
#define	T_kd	16
	{ "kd", "sends cursor down" },
#define	T_kl	17
	{ "kl", "sends cursor left" },
#define	T_kr	18
	{ "kr", "sends cursor right" },
#define	T_ku	19
	{ "ku", "sends cursor up" },
#define	T_md	20
	{ "md", "begin bold" },
#define	T_me	21
	{ "me", "end attributes" },
#define	T_nd	22
	{ "nd", "non destructive space" },
#define	T_se	23
	{ "se", "end standout" },
#define	T_so	24
	{ "so", "begin standout" },
#define	T_ts	25
	{ "ts", "cursor to status line" },
#define	T_up	26
	{ "up", "cursor up one" },
#define	T_us	27
	{ "us", "begin underline" },
#define	T_ue	28
	{ "ue", "end underline" },
#define	T_vb	29
	{ "vb", "visible bell" },
#define	T_DC	30
	{ "DC", "delete multiple chars" },
#define	T_DO	31
	{ "DO", "cursor down multiple" },
#define	T_IC	32
	{ "IC", "insert multiple chars" },
#define	T_LE	33
	{ "LE", "cursor left multiple" },
#define	T_RI	34
	{ "RI", "cursor right multiple" },
#define	T_UP	35
	{ "UP", "cursor up multiple" },
#define	T_kh	36
	{ "kh", "send cursor home" },
#define	T_at7	37
	{ "@7", "send cursor end" },
#define	T_str	38
	{ NULL, NULL }
};

private const struct termcapval {
	const char *name;
	const char *long_name;
} tval[] = {
#define	T_am	0
	{ "am", "has automatic margins" },
#define	T_pt	1
	{ "pt", "has physical tabs" },
#define	T_li	2
	{ "li", "Number of lines" },
#define	T_co	3
	{ "co", "Number of columns" },
#define	T_km	4
	{ "km", "Has meta key" },
#define	T_xt	5
	{ "xt", "Tab chars destructive" },
#define	T_xn	6
	{ "xn", "newline ignored at right margin" },
#define	T_MT	7
	{ "MT", "Has meta key" },			/* XXX? */
#define	T_val	8
	{ NULL, NULL, }
};
/* do two or more of the attributes use me */

private void	term_setflags(EditLine *);
private int	term_rebuffer_display(EditLine *);
private void	term_free_display(EditLine *);
private int	term_alloc_display(EditLine *);
private void	term_alloc(EditLine *, const struct termcapstr *, const char *);
private void	term_init_arrow(EditLine *);
private void	term_reset_arrow(EditLine *);


private FILE *term_outfile = NULL;	/* XXX: How do we fix that? */


/* term_setflags():
 *	Set the terminal capability flags
 */
private void
term_setflags(EditLine *el)
{
	EL_FLAGS = 0;
	if (el->el_tty.t_tabs)
		EL_FLAGS |= (Val(T_pt) && !Val(T_xt)) ? TERM_CAN_TAB : 0;

	EL_FLAGS |= (Val(T_km) || Val(T_MT)) ? TERM_HAS_META : 0;
	EL_FLAGS |= GoodStr(T_ce) ? TERM_CAN_CEOL : 0;
	EL_FLAGS |= (GoodStr(T_dc) || GoodStr(T_DC)) ? TERM_CAN_DELETE : 0;
	EL_FLAGS |= (GoodStr(T_im) || GoodStr(T_ic) || GoodStr(T_IC)) ?
	    TERM_CAN_INSERT : 0;
	EL_FLAGS |= (GoodStr(T_up) || GoodStr(T_UP)) ? TERM_CAN_UP : 0;
	EL_FLAGS |= Val(T_am) ? TERM_HAS_AUTO_MARGINS : 0;
	EL_FLAGS |= Val(T_xn) ? TERM_HAS_MAGIC_MARGINS : 0;

	if (GoodStr(T_me) && GoodStr(T_ue))
		EL_FLAGS |= (strcmp(Str(T_me), Str(T_ue)) == 0) ?
		    TERM_CAN_ME : 0;
	else
		EL_FLAGS &= ~TERM_CAN_ME;
	if (GoodStr(T_me) && GoodStr(T_se))
		EL_FLAGS |= (strcmp(Str(T_me), Str(T_se)) == 0) ?
		    TERM_CAN_ME : 0;


#ifdef DEBUG_SCREEN
	if (!EL_CAN_UP) {
		(void) fprintf(el->el_errfile,
		    "WARNING: Your terminal cannot move up.\n");
		(void) fprintf(el->el_errfile,
		    "Editing may be odd for long lines.\n");
	}
	if (!EL_CAN_CEOL)
		(void) fprintf(el->el_errfile, "no clear EOL capability.\n");
	if (!EL_CAN_DELETE)
		(void) fprintf(el->el_errfile, "no delete char capability.\n");
	if (!EL_CAN_INSERT)
		(void) fprintf(el->el_errfile, "no insert char capability.\n");
#endif /* DEBUG_SCREEN */
}


/* term_init():
 *	Initialize the terminal stuff
 */
protected int
term_init(EditLine *el)
{

	el->el_term.t_buf = (char *) el_malloc(TC_BUFSIZE);
	if (el->el_term.t_buf == NULL)
		return (-1);
	el->el_term.t_cap = (char *) el_malloc(TC_BUFSIZE);
	if (el->el_term.t_cap == NULL)
		return (-1);
	el->el_term.t_fkey = (fkey_t *) el_malloc(A_K_NKEYS * sizeof(fkey_t));
	if (el->el_term.t_fkey == NULL)
		return (-1);
	el->el_term.t_loc = 0;
	el->el_term.t_str = (char **) el_malloc(T_str * sizeof(char *));
	if (el->el_term.t_str == NULL)
		return (-1);
	(void) memset(el->el_term.t_str, 0, T_str * sizeof(char *));
	el->el_term.t_val = (int *) el_malloc(T_val * sizeof(int));
	if (el->el_term.t_val == NULL)
		return (-1);
	(void) memset(el->el_term.t_val, 0, T_val * sizeof(int));
	term_outfile = el->el_outfile;
	(void) term_set(el, NULL);
	term_init_arrow(el);
	return (0);
}
/* term_end():
 *	Clean up the terminal stuff
 */
protected void
term_end(EditLine *el)
{

	el_free((ptr_t) el->el_term.t_buf);
	el->el_term.t_buf = NULL;
	el_free((ptr_t) el->el_term.t_cap);
	el->el_term.t_cap = NULL;
	el_free((ptr_t) el->el_term.t_fkey);
	el->el_term.t_fkey = NULL;
	el->el_term.t_loc = 0;
	el_free((ptr_t) el->el_term.t_str);
	el->el_term.t_str = NULL;
	el_free((ptr_t) el->el_term.t_val);
	el->el_term.t_val = NULL;
	term_free_display(el);
}


/* term_alloc():
 *	Maintain a string pool for termcap strings
 */
private void
term_alloc(EditLine *el, const struct termcapstr *t, const char *cap)
{
	char termbuf[TC_BUFSIZE];
	int tlen, clen;
	char **tlist = el->el_term.t_str;
	char **tmp, **str = &tlist[t - tstr];

	if (cap == NULL || *cap == '\0') {
		*str = NULL;
		return;
	} else
		clen = strlen(cap);

	tlen = *str == NULL ? 0 : strlen(*str);

	/*
         * New string is shorter; no need to allocate space
         */
	if (clen <= tlen) {
		(void) strcpy(*str, cap);	/* XXX strcpy is safe */
		return;
	}
	/*
         * New string is longer; see if we have enough space to append
         */
	if (el->el_term.t_loc + 3 < TC_BUFSIZE) {
						/* XXX strcpy is safe */
		(void) strcpy(*str = &el->el_term.t_buf[el->el_term.t_loc],
		    cap);
		el->el_term.t_loc += clen + 1;	/* one for \0 */
		return;
	}
	/*
         * Compact our buffer; no need to check compaction, cause we know it
         * fits...
         */
	tlen = 0;
	for (tmp = tlist; tmp < &tlist[T_str]; tmp++)
		if (*tmp != NULL && *tmp != '\0' && *tmp != *str) {
			char *ptr;

			for (ptr = *tmp; *ptr != '\0'; termbuf[tlen++] = *ptr++)
				continue;
			termbuf[tlen++] = '\0';
		}
	memcpy(el->el_term.t_buf, termbuf, TC_BUFSIZE);
	el->el_term.t_loc = tlen;
	if (el->el_term.t_loc + 3 >= TC_BUFSIZE) {
		(void) fprintf(el->el_errfile,
		    "Out of termcap string space.\n");
		return;
	}
					/* XXX strcpy is safe */
	(void) strcpy(*str = &el->el_term.t_buf[el->el_term.t_loc], cap);
	el->el_term.t_loc += clen + 1;	/* one for \0 */
	return;
}


/* term_rebuffer_display():
 *	Rebuffer the display after the screen changed size
 */
private int
term_rebuffer_display(EditLine *el)
{
	coord_t *c = &el->el_term.t_size;

	term_free_display(el);

	c->h = Val(T_co);
	c->v = Val(T_li);

	if (term_alloc_display(el) == -1)
		return (-1);
	return (0);
}


/* term_alloc_display():
 *	Allocate a new display.
 */
private int
term_alloc_display(EditLine *el)
{
	int i;
	char **b;
	coord_t *c = &el->el_term.t_size;

	b = (char **) el_malloc((size_t) (sizeof(char *) * (c->v + 1)));
	if (b == NULL)
		return (-1);
	for (i = 0; i < c->v; i++) {
		b[i] = (char *) el_malloc((size_t) (sizeof(char) * (c->h + 1)));
		if (b[i] == NULL)
			return (-1);
	}
	b[c->v] = NULL;
	el->el_display = b;

	b = (char **) el_malloc((size_t) (sizeof(char *) * (c->v + 1)));
	if (b == NULL)
		return (-1);
	for (i = 0; i < c->v; i++) {
		b[i] = (char *) el_malloc((size_t) (sizeof(char) * (c->h + 1)));
		if (b[i] == NULL)
			return (-1);
	}
	b[c->v] = NULL;
	el->el_vdisplay = b;
	return (0);
}


/* term_free_display():
 *	Free the display buffers
 */
private void
term_free_display(EditLine *el)
{
	char **b;
	char **bufp;

	b = el->el_display;
	el->el_display = NULL;
	if (b != NULL) {
		for (bufp = b; *bufp != NULL; bufp++)
			el_free((ptr_t) * bufp);
		el_free((ptr_t) b);
	}
	b = el->el_vdisplay;
	el->el_vdisplay = NULL;
	if (b != NULL) {
		for (bufp = b; *bufp != NULL; bufp++)
			el_free((ptr_t) * bufp);
		el_free((ptr_t) b);
	}
}


/* term_move_to_line():