term.c

早期freebsd实现

/*-
 * 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.
 */

#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)term.c	8.1 (Berkeley) 6/4/93";
#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 "sys.h"
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "termcap.h"	/* XXX: should be <termcap.h> */
#include <sys/types.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]

private struct {
    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 }
};

private struct termcapstr {
    char   *name;
    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_str	36
    {	NULL,   NULL			 	}
};

private struct termcapval {
    char   *name;
    char   *long_name;
} tval[] = {
#define T_pt	0
    {	"pt",	"has physical tabs"	},
#define T_li	1
    {	"li",	"Number of lines"	},
#define T_co	2
    {	"co",	"Number of columns"	},
#define T_km	3
    {	"km",	"Has meta key"		},
#define T_xt	4
    {	"xt",	"Tab chars destructive" },
#define T_MT	5
    {	"MT",	"Has meta key"		},	/* XXX? */
#define T_val	6
    {	NULL, 	NULL,			}
};

/* do two or more of the attributes use me */

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


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


/* term_setflags():
 *	Set the terminal capability flags
 */
private void
term_setflags(el)
    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;

    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(el)
    EditLine *el;
{
    el->el_term.t_buf = (char *)  el_malloc(TC_BUFSIZE);
    el->el_term.t_cap = (char *)  el_malloc(TC_BUFSIZE);
    el->el_term.t_fkey = (fkey_t *) el_malloc(4 * sizeof(fkey_t));
    el->el_term.t_loc = 0;
    el->el_term.t_str = (char **) el_malloc(T_str * sizeof(char*));
    (void) memset(el->el_term.t_str, 0, T_str * sizeof(char*));
    el->el_term.t_val = (int *)   el_malloc(T_val * sizeof(int));
    (void) memset(el->el_term.t_val, 0, T_val * sizeof(char*));
    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(el)
    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->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(el, t, cap)
    EditLine *el;
    struct termcapstr *t;
    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);
	return;
    }

    /*
     * New string is longer; see if we have enough space to append
     */
    if (el->el_term.t_loc + 3 < TC_BUFSIZE) {
	(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;
    }
    (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;
} /* end term_alloc */


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

    term_free_display(el);

    /* make this public, -1 to avoid wraps */
    c->h = Val(T_co) - 1;
    c->v = (EL_BUFSIZ * 4) / c->h + 1;

    term_alloc_display(el);
} /* end term_rebuffer_display */


/* term_alloc_display():
 *	Allocate a new display.
 */
private void
term_alloc_display(el)
    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)));
    for (i = 0; i < c->v; i++)
	b[i] = (char *) el_malloc((size_t) (sizeof(char) * (c->h + 1)));
    b[c->v] = NULL;
    el->el_display = b;

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

} /* end term_alloc_display */


/* term_free_display():
 *	Free the display buffers
 */
private void
term_free_display(el)
    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);
    }
} /* end term_free_display */


/* term_move_to_line():
 *	move to line <where> (first line == 0)
 * 	as efficiently as possible
 */
protected void
term_move_to_line(el, where)
    EditLine *el;
    int     where;		
{