ecuicmhist.c

一个通讯程序源码

/*+-------------------------------------------------------------------------
	ecuicmhist.c - ECU interactive command history handler
	[e-mail]

  Defined functions:
	icmd_history_add(icmd_buf)
	icmd_history_manager(func,newicmd,icmdsize)

--------------------------------------------------------------------------*/
/*+:EDITS:*/
/*:09-13-1992-02:05-wht@n4hgf-redisplay escape prompt on error exit */
/*:09-10-1992-13:58-wht@n4hgf-ECU release 3.20 */
/*:08-22-1992-15:38-wht@n4hgf-ECU release 3.20 BETA */
/*:08-28-1991-14:07-wht@n4hgf2-SVR4 cleanup by aega84!lh */
/*:08-11-1991-14:58-wht@n4hgf-new ttygets botched command history handler */
/*:07-25-1991-12:56-wht@n4hgf-ECU release 3.10 */
/*:07-14-1991-18:18-wht@n4hgf-new ttygets functions */
/*:08-14-1990-20:40-wht@n4hgf-ecu3.00-flush old edit history */

#include "ecucurses.h"

#define STDIO_H_INCLUDED
#define OMIT_TERMIO_REFERENCES
#include "ecu.h"

#include "pc_scr.h"
#include "ecukey.h"
#include "ecuxkey.h"
#include "ecutty.h"

char *strdup();

#define ICMDH_MAXCNT	50
#define ICMDH_MAXLEN	72

typedef struct icmd_hist
{
	struct icmd_hist *prev;
	struct icmd_hist *next;
	uchar *icmd;
} ICMDH;

ICMDH *icmdh_head = (ICMDH *)0;
ICMDH *icmdh_tail = (ICMDH *)0;
int icmdh_count = 0;

/*+-------------------------------------------------------------------------
	icmd_history_add(icmd_buf)
--------------------------------------------------------------------------*/
void
icmd_history_add(icmd_buf)
char *icmd_buf;
{
ICMDH *icmdh = (ICMDH *)malloc(sizeof(ICMDH));
char *strdup();

	if(!icmdh)
		return;
	if(!(icmdh->icmd = (uchar *)strdup(icmd_buf)))
	{
		free((char *)icmdh);
		return;
	}
	if(strlen((char *)icmdh->icmd) > (unsigned)ICMDH_MAXLEN)
		icmdh->icmd[ICMDH_MAXLEN] = 0;
	if(icmdh_tail)
	{
		icmdh_tail->next = icmdh;
		icmdh->prev = icmdh_tail;
		icmdh->next = (ICMDH *)0;
		icmdh_tail = icmdh;
	}
	else
	{
		icmdh->prev = (ICMDH *)0;
		icmdh->next = (ICMDH *)0;
		icmdh_head = icmdh;
		icmdh_tail = icmdh;
	}
	if(++icmdh_count > ICMDH_MAXCNT)
	{
		icmdh = icmdh_head;
		icmdh_head = icmdh->next;
		icmdh_head->prev = (ICMDH *)0;
		free((char *)icmdh->icmd);
		free((char *)icmdh);
		icmdh_count--;
	}
		
}	/* end of icmd_history_add */

/*+-------------------------------------------------------------------------
	icmd_history_manager(func,newicmd,icmdsize) - entered by Home Xkey

return new icmd string to execute
returns 0 if ok to exce new cmd, else 1 if not
(returns 0 if null or ESC, so caller can handle exit condition)
--------------------------------------------------------------------------*/
/*ARGSUSED*/
int
icmd_history_manager(func,newicmd,icmdsize)
uchar func;
uchar *newicmd;
int icmdsize;
{
register itmp;
register ICMDH *icmdh = icmdh_tail;
uchar delim;

	if(!icmdh)
	{
		ff(se,"  no interactive commands saved\r\n");
		show_escape_prompt();
		return(1);
	}
	while(1)
	{
		strncpy((char *)newicmd,(char *)icmdh->icmd,icmdsize - 1);
		*(newicmd + icmdsize - 1) = 0;

		ttygets(newicmd,icmdsize,TG_XDELIM | TG_EDIT,&delim,(int *)0);
		if(!newicmd[0])
			return(0);

		switch(delim)
		{
			case ESC:
				*newicmd = 0;
				return(0);

			case XFhome:
				icmdh = icmdh_head;
				break;

			case XFend:
				icmdh = icmdh_tail;
				break;

			case XFpgup:
			case XFpgdn:
				ring_bell();
				break;

			case XFcurup:
				if(icmdh->prev)
					icmdh = icmdh->prev;
				break;

			case XFcurdn:
				if(icmdh->next)
					icmdh = icmdh->next;
				break;

			default:
				return(0);
		}

		itmp = strlen((char *)newicmd);
		while(itmp--)
			fputc(BS,se);
		itmp = strlen((char *)newicmd);
		while(itmp--)
			fputc(' ',se);
		itmp = strlen((char *)newicmd);
		while(itmp--)
			fputc(BS,se);
	}
}	/* end of icmd_history_manager */

/* vi: set tabstop=4 shiftwidth=4: */
/* end of ecuicmhist.c */