Function db_pager

freebsd/ddb/db_output.c:254–304

* A simple paging callout function. It supports several simple more(1)-like * commands as well as a quit command that sets db_pager_quit which db * commands can poll to see if they should terminate early. */

 * commands can poll to see if they should terminate early.
 */
void
db_pager(void)
{
	int c, done;

	db_capture_enterpager();
	db_printf("--More--\r");
	done = 0;
	while (!done) {
		c = cngetc();
		switch (c) {
		case 'e':
		case 'j':
		case '\n':
			/* Just one more line. */
			db_maxlines = 1;
			done++;
			break;
		case 'd':
			/* Half a page. */
			db_maxlines = db_lines_per_page / 2;
			done++;
			break;
		case 'f':
		case ' ':
			/* Another page. */
			db_maxlines = db_lines_per_page;
			done++;
			break;
		case 'q':
		case 'Q':
		case 'x':
		case 'X':
			/* Quit */
			db_maxlines = 0;
			db_pager_quit = 1;
			done++;
			break;
#if 0
			/* FALLTHROUGH */
		default:
			cnputc('\007');
#endif
		}
	}
	db_printf("        ");
	db_force_whitespace();
	db_printf("\r");
	db_newlines = 0;
	db_capture_exitpager();
}

/*
 * Return output position