more.c

mips架构的bootloader,99左右的版本 但源代码现在没人更新了

/*************************************************************
 * File: mon/more.c
 * Purpose: Part of core Monitor. This module implements the 'more'
 *	    function used by many of the commands.
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	970304	Start of revision history
 *	970822	Permit ESC to be used to exit more
 *	980331	changed getchar to GETCHAR for imon95
 *	980405	Allow \r in place of \n
 */

#include <stdio.h>
#include <termio.h>
#include <mon.h>

#ifdef PMCC
#define GETCHAR getchar
#endif

#define BEL 007
#define TIKRATE  20000

char more_pat[LINESZ];
int tik_cnt;
char more_tiks[] = "|/-\\";
char *more_tik;
char *more_msg = "more... ";

Optdesc more_opts[] = {
	{"","paginator"},
	{"/str","search for str"},
	{"n","repeat last search"},
	{"SPACE","next page"},
	{"CR","next line"},
	{"q|ESC","quit"},
	{0}};

/*************************************************************
*  test more function
*	compile as: pmcc -DTEST more.c
*/
#ifdef TEST
main(argc,argv)
int argc;
char *argv[];
{
int i,cnt,siz;
char tmp[100];

siz = 8;
cnt = siz;
if (argc == 1) {
	printf("usage: more [cnt] [siz]\n");
	exit(1);
	}
if (argc > 2) sscanf(argv[2],"%d",&siz);
if (argc > 1) sscanf(argv[1],"%d",&cnt);
ioctl_cbreak(0L);
for (i=0;i<60;i++) {
	mkln(tmp);
	if (more(tmp,&cnt,siz)) break;
	}
}

mkln(p)
char *p;
{
int i;
for (i='a';i<='z';i++) *p++ = i;
*p = 0;
}
#endif

/*************************************************************
*  more(p,cnt,size)
*	The 'more' paginator 	
*/
more(p,cnt,size)
char *p;
int *cnt,size;
{
int r;

if (*cnt == 0) {
	if (size == 0) return(1); /* if *cnt=0 and size=0 we're done */
	while ((r = getinp(cnt,size)) == -1) ;
	if (r) /* quit */ {
		*p = 0;
		return(1);
		}
	}

if (*cnt == -1) { /* search in progress */
	if (!strposn(p,more_pat)) {
		dotik(256,0);
		return(0); /* not found yet */
		}
	else { /* found */
		*cnt = size;
		printf("\b \n");
		}
	}

printf("%s\n",p);
*p = 0;
(*cnt)--;
return(0);
}

/*************************************************************
*  getinp(cnt,size)
*/
getinp(cnt,size)
int *cnt,size;
{
int i,c;

printf("%s",more_msg);
for (;;) {
	c = GETCHAR();
	if (c == '\r') c = '\n';
	if (strchr("nq/ \n\033",c)) break;
	putchar(BEL);
	}
era_line(more_msg);
if (c == 'q' || c == 033) return(1);
switch (c) {
	case ' ' : *cnt = size; 	break;
	case '\n': *cnt = 1;		break;
	case '/' : 
		/* get pattern */
		putchar('/');
		for (i=0;;) {
			c = GETCHAR();
			if (c == '\r') c = '\n';
			if (c == '\n') break;
			if (c == '\b') {
				if (i > 0) {
					putchar(c);
					i--;
					}
				else {
					putchar('\b');
					return(-1);
					}
				}
			else {
				putchar(c);
				more_pat[i++] = c;
				}
			}
		more_pat[i] = 0;
		printf("  ");
		*cnt = -1; /* enter search mode */
		break;
	case 'n' : 
		printf("/%s  ",more_pat);
		*cnt = -1; /* enter search mode */
		break;
	}
return(0);
}

/*************************************************************
*  void dotik(rate,use_ret)
*	rate -- controls how fast the display rotates. The larger
*		the value, the faster the rotation.
*	use_ret
*		specifies that " %c\r" should be used rather than
*		"\b%c".
*/
void dotik(rate,use_ret)
int rate,use_ret;
{

tik_cnt -= rate;
if (tik_cnt > 0) return;
tik_cnt = TIKRATE;
if (more_tik == 0) more_tik = more_tiks;
if (*more_tik == 0) more_tik = more_tiks;
if (use_ret) printf(" %c\r",*more_tik);
else printf("\b%c",*more_tik);
more_tik++;
}