1171 lines
23 KiB
C
1171 lines
23 KiB
C
/*
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* Top users/processes display for Unix
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* Version 3
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*
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* This program may be freely redistributed,
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* but this entire comment MUST remain intact.
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*
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* Copyright (c) 1984, 1989, William LeFebvre, Rice University
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* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
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*/
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/*
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* This file contains the routines that display information on the screen.
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* Each section of the screen has two routines: one for initially writing
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* all constant and dynamic text, and one for only updating the text that
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* changes. The prefix "i_" is used on all the "initial" routines and the
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* prefix "u_" is used for all the "updating" routines.
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*
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* ASSUMPTIONS:
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* None of the "i_" routines use any of the termcap capabilities.
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* In this way, those routines can be safely used on terminals that
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* have minimal (or nonexistant) terminal capabilities.
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*
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* The routines are called in this order: *_loadave, i_timeofday,
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* *_procstates, *_cpustates, *_memory, *_message, *_header,
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* *_process, u_endscreen.
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*/
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#include "os.h"
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#include <ctype.h>
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#include <time.h>
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#include "screen.h" /* interface to screen package */
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#include "layout.h" /* defines for screen position layout */
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#include "display.h"
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#include "top.h"
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#include "top.local.h"
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#include "boolean.h"
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#include "machine.h" /* we should eliminate this!!! */
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#include "utils.h"
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#ifdef DEBUG
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FILE *debug;
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#endif
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/* imported from screen.c */
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extern int overstrike;
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static int lmpid = 0;
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static int last_hi = 0; /* used in u_process and u_endscreen */
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static int lastline = 0;
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static int display_width = MAX_COLS;
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#define lineindex(l) ((l)*display_width)
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char *printable();
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/* things initialized by display_init and used thruout */
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/* buffer of proc information lines for display updating */
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char *screenbuf = NULL;
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static char **procstate_names;
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static char **cpustate_names;
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static char **memory_names;
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static char **swap_names;
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static int num_procstates;
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static int num_cpustates;
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static int num_memory;
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static int num_swap;
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static int *lprocstates;
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static int *lcpustates;
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static int *lmemory;
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static int *lswap;
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static int *cpustate_columns;
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static int cpustate_total_length;
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static enum { OFF, ON, ERASE } header_status = ON;
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static int string_count();
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static void summary_format();
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static void line_update();
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int display_resize()
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{
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register int lines;
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/* first, deallocate any previous buffer that may have been there */
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if (screenbuf != NULL)
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{
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free(screenbuf);
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}
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/* calculate the current dimensions */
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/* if operating in "dumb" mode, we only need one line */
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lines = smart_terminal ? screen_length - Header_lines : 1;
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/* we don't want more than MAX_COLS columns, since the machine-dependent
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modules make static allocations based on MAX_COLS and we don't want
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to run off the end of their buffers */
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display_width = screen_width;
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if (display_width >= MAX_COLS)
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{
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display_width = MAX_COLS - 1;
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}
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/* now, allocate space for the screen buffer */
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screenbuf = (char *)malloc(lines * display_width);
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if (screenbuf == (char *)NULL)
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{
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/* oops! */
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return(-1);
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}
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/* return number of lines available */
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/* for dumb terminals, pretend like we can show any amount */
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return(smart_terminal ? lines : Largest);
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}
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int display_init(statics)
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struct statics *statics;
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{
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register int lines;
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register char **pp;
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register int *ip;
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register int i;
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/* call resize to do the dirty work */
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lines = display_resize();
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/* only do the rest if we need to */
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if (lines > -1)
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{
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/* save pointers and allocate space for names */
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procstate_names = statics->procstate_names;
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num_procstates = string_count(procstate_names);
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lprocstates = (int *)malloc(num_procstates * sizeof(int));
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cpustate_names = statics->cpustate_names;
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swap_names = statics->swap_names;
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num_swap = string_count(swap_names);
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lswap = (int *)malloc(num_swap * sizeof(int));
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num_cpustates = string_count(cpustate_names);
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lcpustates = (int *)malloc(num_cpustates * sizeof(int));
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cpustate_columns = (int *)malloc(num_cpustates * sizeof(int));
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memory_names = statics->memory_names;
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num_memory = string_count(memory_names);
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lmemory = (int *)malloc(num_memory * sizeof(int));
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/* calculate starting columns where needed */
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cpustate_total_length = 0;
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pp = cpustate_names;
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ip = cpustate_columns;
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while (*pp != NULL)
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{
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if ((i = strlen(*pp++)) > 0)
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{
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*ip++ = cpustate_total_length;
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cpustate_total_length += i + 8;
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}
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}
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}
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/* return number of lines available */
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return(lines);
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}
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i_loadave(mpid, avenrun)
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int mpid;
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double *avenrun;
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{
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register int i;
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/* i_loadave also clears the screen, since it is first */
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clear();
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/* mpid == -1 implies this system doesn't have an _mpid */
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if (mpid != -1)
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{
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printf("last pid: %5d; ", mpid);
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}
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printf("load averages");
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for (i = 0; i < 3; i++)
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{
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printf("%c %5.2f",
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i == 0 ? ':' : ',',
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avenrun[i]);
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}
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lmpid = mpid;
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}
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u_loadave(mpid, avenrun)
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int mpid;
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double *avenrun;
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{
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register int i;
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if (mpid != -1)
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{
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/* change screen only when value has really changed */
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if (mpid != lmpid)
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{
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Move_to(x_lastpid, y_lastpid);
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printf("%5d", mpid);
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lmpid = mpid;
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}
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/* i remembers x coordinate to move to */
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i = x_loadave;
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}
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else
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{
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i = x_loadave_nompid;
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}
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/* move into position for load averages */
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Move_to(i, y_loadave);
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/* display new load averages */
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/* we should optimize this and only display changes */
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for (i = 0; i < 3; i++)
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{
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printf("%s%5.2f",
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i == 0 ? "" : ", ",
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avenrun[i]);
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}
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}
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i_timeofday(tod)
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time_t *tod;
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{
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/*
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* Display the current time.
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* "ctime" always returns a string that looks like this:
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*
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* Sun Sep 16 01:03:52 1973
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* 012345678901234567890123
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* 1 2
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*
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* We want indices 11 thru 18 (length 8).
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*/
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if (smart_terminal)
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{
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Move_to(screen_width - 8, 0);
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}
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else
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{
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fputs(" ", stdout);
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}
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#ifdef DEBUG
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{
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char *foo;
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foo = ctime(tod);
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fputs(foo, stdout);
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}
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#endif
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printf("%-8.8s\n", &(ctime(tod)[11]));
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lastline = 1;
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}
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static int ltotal = 0;
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static char procstates_buffer[128];
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/*
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* *_procstates(total, brkdn, names) - print the process summary line
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*
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* Assumptions: cursor is at the beginning of the line on entry
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* lastline is valid
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*/
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i_procstates(total, brkdn)
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int total;
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int *brkdn;
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{
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register int i;
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/* write current number of processes and remember the value */
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printf("%d processes:", total);
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ltotal = total;
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/* put out enough spaces to get to column 15 */
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i = digits(total);
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while (i++ < 4)
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{
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putchar(' ');
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}
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/* format and print the process state summary */
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summary_format(procstates_buffer, brkdn, procstate_names);
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fputs(procstates_buffer, stdout);
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/* save the numbers for next time */
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memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
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}
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u_procstates(total, brkdn)
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int total;
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int *brkdn;
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{
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static char new[128];
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register int i;
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/* update number of processes only if it has changed */
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if (ltotal != total)
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{
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/* move and overwrite */
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#if (x_procstate == 0)
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Move_to(x_procstate, y_procstate);
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#else
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/* cursor is already there...no motion needed */
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/* assert(lastline == 1); */
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#endif
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printf("%d", total);
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/* if number of digits differs, rewrite the label */
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if (digits(total) != digits(ltotal))
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{
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fputs(" processes:", stdout);
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/* put out enough spaces to get to column 15 */
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i = digits(total);
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while (i++ < 4)
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{
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putchar(' ');
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}
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/* cursor may end up right where we want it!!! */
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}
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/* save new total */
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ltotal = total;
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}
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/* see if any of the state numbers has changed */
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if (memcmp(lprocstates, brkdn, num_procstates * sizeof(int)) != 0)
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{
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/* format and update the line */
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summary_format(new, brkdn, procstate_names);
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line_update(procstates_buffer, new, x_brkdn, y_brkdn);
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memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
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}
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}
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/*
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* *_cpustates(states, names) - print the cpu state percentages
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*
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* Assumptions: cursor is on the PREVIOUS line
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*/
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static int cpustates_column;
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/* cpustates_tag() calculates the correct tag to use to label the line */
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char *cpustates_tag()
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{
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register char *use;
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static char *short_tag = "CPU: ";
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static char *long_tag = "CPU states: ";
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/* if length + strlen(long_tag) >= screen_width, then we have to
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use the shorter tag (we subtract 2 to account for ": ") */
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if (cpustate_total_length + (int)strlen(long_tag) - 2 >= screen_width)
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{
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use = short_tag;
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}
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else
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{
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use = long_tag;
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}
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/* set cpustates_column accordingly then return result */
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cpustates_column = strlen(use);
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return(use);
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}
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i_cpustates(states)
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register int *states;
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{
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register int i = 0;
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register int value;
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register char **names = cpustate_names;
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register char *thisname;
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/* print tag and bump lastline */
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printf("\n%s", cpustates_tag());
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lastline++;
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/* now walk thru the names and print the line */
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while ((thisname = *names++) != NULL)
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{
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if (*thisname != '\0')
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{
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/* retrieve the value and remember it */
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value = *states++;
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/* if percentage is >= 1000, print it as 100% */
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printf((value >= 1000 ? "%s%4.0f%% %s" : "%s%4.1f%% %s"),
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i++ == 0 ? "" : ", ",
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((float)value)/10.,
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thisname);
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}
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}
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/* copy over values into "last" array */
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memcpy(lcpustates, states, num_cpustates * sizeof(int));
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}
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u_cpustates(states)
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register int *states;
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{
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register int value;
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register char **names = cpustate_names;
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register char *thisname;
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register int *lp;
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register int *colp;
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Move_to(cpustates_column, y_cpustates);
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lastline = y_cpustates;
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lp = lcpustates;
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colp = cpustate_columns;
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/* we could be much more optimal about this */
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while ((thisname = *names++) != NULL)
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{
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if (*thisname != '\0')
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{
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/* did the value change since last time? */
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if (*lp != *states)
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{
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/* yes, move and change */
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Move_to(cpustates_column + *colp, y_cpustates);
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lastline = y_cpustates;
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/* retrieve value and remember it */
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value = *states;
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/* if percentage is >= 1000, print it as 100% */
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printf((value >= 1000 ? "%4.0f" : "%4.1f"),
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((double)value)/10.);
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/* remember it for next time */
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*lp = *states;
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}
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}
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/* increment and move on */
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lp++;
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states++;
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colp++;
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}
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}
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z_cpustates()
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{
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register int i = 0;
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register char **names = cpustate_names;
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register char *thisname;
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register int *lp;
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/* show tag and bump lastline */
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printf("\n%s", cpustates_tag());
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lastline++;
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while ((thisname = *names++) != NULL)
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{
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if (*thisname != '\0')
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{
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printf("%s %% %s", i++ == 0 ? "" : ", ", thisname);
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}
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}
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/* fill the "last" array with all -1s, to insure correct updating */
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lp = lcpustates;
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i = num_cpustates;
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while (--i >= 0)
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{
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*lp++ = -1;
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}
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}
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/*
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* *_memory(stats) - print "Memory: " followed by the memory summary string
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*
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* Assumptions: cursor is on "lastline"
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* for i_memory ONLY: cursor is on the previous line
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*/
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char memory_buffer[MAX_COLS];
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i_memory(stats)
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int *stats;
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{
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fputs("\nMem: ", stdout);
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lastline++;
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/* format and print the memory summary */
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summary_format(memory_buffer, stats, memory_names);
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fputs(memory_buffer, stdout);
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}
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u_memory(stats)
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int *stats;
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{
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static char new[MAX_COLS];
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/* format the new line */
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summary_format(new, stats, memory_names);
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line_update(memory_buffer, new, x_mem, y_mem);
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}
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|
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/*
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* *_swap(stats) - print "Swap: " followed by the swap summary string
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*
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* Assumptions: cursor is on "lastline"
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* for i_swap ONLY: cursor is on the previous line
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*/
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char swap_buffer[MAX_COLS];
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i_swap(stats)
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int *stats;
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{
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fputs("\nSwap: ", stdout);
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lastline++;
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|
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/* format and print the swap summary */
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summary_format(swap_buffer, stats, swap_names);
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fputs(swap_buffer, stdout);
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}
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u_swap(stats)
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int *stats;
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{
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static char new[MAX_COLS];
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/* format the new line */
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summary_format(new, stats, swap_names);
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line_update(swap_buffer, new, x_swap, y_swap);
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}
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/*
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* *_message() - print the next pending message line, or erase the one
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* that is there.
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*
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* Note that u_message is (currently) the same as i_message.
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*
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* Assumptions: lastline is consistent
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*/
|
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|
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/*
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* i_message is funny because it gets its message asynchronously (with
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* respect to screen updates).
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*/
|
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|
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static char next_msg[MAX_COLS + 5];
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static int msglen = 0;
|
|
/* Invariant: msglen is always the length of the message currently displayed
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on the screen (even when next_msg doesn't contain that message). */
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|
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i_message()
|
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|
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{
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while (lastline < y_message)
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{
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fputc('\n', stdout);
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lastline++;
|
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}
|
|
if (next_msg[0] != '\0')
|
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{
|
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standout(next_msg);
|
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msglen = strlen(next_msg);
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next_msg[0] = '\0';
|
|
}
|
|
else if (msglen > 0)
|
|
{
|
|
(void) clear_eol(msglen);
|
|
msglen = 0;
|
|
}
|
|
}
|
|
|
|
u_message()
|
|
|
|
{
|
|
i_message();
|
|
}
|
|
|
|
static int header_length;
|
|
|
|
/*
|
|
* *_header(text) - print the header for the process area
|
|
*
|
|
* Assumptions: cursor is on the previous line and lastline is consistent
|
|
*/
|
|
|
|
i_header(text)
|
|
|
|
char *text;
|
|
|
|
{
|
|
header_length = strlen(text);
|
|
if (header_status == ON)
|
|
{
|
|
putchar('\n');
|
|
fputs(text, stdout);
|
|
lastline++;
|
|
}
|
|
else if (header_status == ERASE)
|
|
{
|
|
header_status = OFF;
|
|
}
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
u_header(text)
|
|
|
|
char *text; /* ignored */
|
|
|
|
{
|
|
if (header_status == ERASE)
|
|
{
|
|
putchar('\n');
|
|
lastline++;
|
|
clear_eol(header_length);
|
|
header_status = OFF;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* *_process(line, thisline) - print one process line
|
|
*
|
|
* Assumptions: lastline is consistent
|
|
*/
|
|
|
|
i_process(line, thisline)
|
|
|
|
int line;
|
|
char *thisline;
|
|
|
|
{
|
|
register char *p;
|
|
register char *base;
|
|
|
|
/* make sure we are on the correct line */
|
|
while (lastline < y_procs + line)
|
|
{
|
|
putchar('\n');
|
|
lastline++;
|
|
}
|
|
|
|
/* truncate the line to conform to our current screen width */
|
|
thisline[display_width] = '\0';
|
|
|
|
/* write the line out */
|
|
fputs(thisline, stdout);
|
|
|
|
/* copy it in to our buffer */
|
|
base = smart_terminal ? screenbuf + lineindex(line) : screenbuf;
|
|
p = strecpy(base, thisline);
|
|
|
|
/* zero fill the rest of it */
|
|
memzero(p, display_width - (p - base));
|
|
}
|
|
|
|
u_process(line, newline)
|
|
|
|
int line;
|
|
char *newline;
|
|
|
|
{
|
|
register char *optr;
|
|
register int screen_line = line + Header_lines;
|
|
register char *bufferline;
|
|
|
|
/* remember a pointer to the current line in the screen buffer */
|
|
bufferline = &screenbuf[lineindex(line)];
|
|
|
|
/* truncate the line to conform to our current screen width */
|
|
newline[display_width] = '\0';
|
|
|
|
/* is line higher than we went on the last display? */
|
|
if (line >= last_hi)
|
|
{
|
|
/* yes, just ignore screenbuf and write it out directly */
|
|
/* get positioned on the correct line */
|
|
if (screen_line - lastline == 1)
|
|
{
|
|
putchar('\n');
|
|
lastline++;
|
|
}
|
|
else
|
|
{
|
|
Move_to(0, screen_line);
|
|
lastline = screen_line;
|
|
}
|
|
|
|
/* now write the line */
|
|
fputs(newline, stdout);
|
|
|
|
/* copy it in to the buffer */
|
|
optr = strecpy(bufferline, newline);
|
|
|
|
/* zero fill the rest of it */
|
|
memzero(optr, display_width - (optr - bufferline));
|
|
}
|
|
else
|
|
{
|
|
line_update(bufferline, newline, 0, line + Header_lines);
|
|
}
|
|
}
|
|
|
|
u_endscreen(hi)
|
|
|
|
register int hi;
|
|
|
|
{
|
|
register int screen_line = hi + Header_lines;
|
|
register int i;
|
|
|
|
if (smart_terminal)
|
|
{
|
|
if (hi < last_hi)
|
|
{
|
|
/* need to blank the remainder of the screen */
|
|
/* but only if there is any screen left below this line */
|
|
if (lastline + 1 < screen_length)
|
|
{
|
|
/* efficiently move to the end of currently displayed info */
|
|
if (screen_line - lastline < 5)
|
|
{
|
|
while (lastline < screen_line)
|
|
{
|
|
putchar('\n');
|
|
lastline++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Move_to(0, screen_line);
|
|
lastline = screen_line;
|
|
}
|
|
|
|
if (clear_to_end)
|
|
{
|
|
/* we can do this the easy way */
|
|
putcap(clear_to_end);
|
|
}
|
|
else
|
|
{
|
|
/* use clear_eol on each line */
|
|
i = hi;
|
|
while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi)
|
|
{
|
|
putchar('\n');
|
|
}
|
|
}
|
|
}
|
|
}
|
|
last_hi = hi;
|
|
|
|
/* move the cursor to a pleasant place */
|
|
Move_to(x_idlecursor, y_idlecursor);
|
|
lastline = y_idlecursor;
|
|
}
|
|
else
|
|
{
|
|
/* separate this display from the next with some vertical room */
|
|
fputs("\n\n", stdout);
|
|
}
|
|
}
|
|
|
|
display_header(t)
|
|
|
|
int t;
|
|
|
|
{
|
|
if (t)
|
|
{
|
|
header_status = ON;
|
|
}
|
|
else if (header_status == ON)
|
|
{
|
|
header_status = ERASE;
|
|
}
|
|
}
|
|
|
|
/*VARARGS2*/
|
|
new_message(type, msgfmt, a1, a2, a3)
|
|
|
|
int type;
|
|
char *msgfmt;
|
|
caddr_t a1, a2, a3;
|
|
|
|
{
|
|
register int i;
|
|
|
|
/* first, format the message */
|
|
(void) sprintf(next_msg, msgfmt, a1, a2, a3);
|
|
|
|
if (msglen > 0)
|
|
{
|
|
/* message there already -- can we clear it? */
|
|
if (!overstrike)
|
|
{
|
|
/* yes -- write it and clear to end */
|
|
i = strlen(next_msg);
|
|
if ((type & MT_delayed) == 0)
|
|
{
|
|
type & MT_standout ? standout(next_msg) :
|
|
fputs(next_msg, stdout);
|
|
(void) clear_eol(msglen - i);
|
|
msglen = i;
|
|
next_msg[0] = '\0';
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ((type & MT_delayed) == 0)
|
|
{
|
|
type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout);
|
|
msglen = strlen(next_msg);
|
|
next_msg[0] = '\0';
|
|
}
|
|
}
|
|
}
|
|
|
|
clear_message()
|
|
|
|
{
|
|
if (clear_eol(msglen) == 1)
|
|
{
|
|
putchar('\r');
|
|
}
|
|
}
|
|
|
|
readline(buffer, size, numeric)
|
|
|
|
char *buffer;
|
|
int size;
|
|
int numeric;
|
|
|
|
{
|
|
register char *ptr = buffer;
|
|
register char ch;
|
|
register char cnt = 0;
|
|
register char maxcnt = 0;
|
|
|
|
/* allow room for null terminator */
|
|
size -= 1;
|
|
|
|
/* read loop */
|
|
while ((fflush(stdout), read(0, ptr, 1) > 0))
|
|
{
|
|
/* newline means we are done */
|
|
if ((ch = *ptr) == '\n' || ch == '\r')
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* handle special editing characters */
|
|
if (ch == ch_kill)
|
|
{
|
|
/* kill line -- account for overstriking */
|
|
if (overstrike)
|
|
{
|
|
msglen += maxcnt;
|
|
}
|
|
|
|
/* return null string */
|
|
*buffer = '\0';
|
|
putchar('\r');
|
|
return(-1);
|
|
}
|
|
else if (ch == ch_erase)
|
|
{
|
|
/* erase previous character */
|
|
if (cnt <= 0)
|
|
{
|
|
/* none to erase! */
|
|
putchar('\7');
|
|
}
|
|
else
|
|
{
|
|
fputs("\b \b", stdout);
|
|
ptr--;
|
|
cnt--;
|
|
}
|
|
}
|
|
/* check for character validity and buffer overflow */
|
|
else if (cnt == size || (numeric && !isdigit(ch)) ||
|
|
!isprint(ch))
|
|
{
|
|
/* not legal */
|
|
putchar('\7');
|
|
}
|
|
else
|
|
{
|
|
/* echo it and store it in the buffer */
|
|
putchar(ch);
|
|
ptr++;
|
|
cnt++;
|
|
if (cnt > maxcnt)
|
|
{
|
|
maxcnt = cnt;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* all done -- null terminate the string */
|
|
*ptr = '\0';
|
|
|
|
/* account for the extra characters in the message area */
|
|
/* (if terminal overstrikes, remember the furthest they went) */
|
|
msglen += overstrike ? maxcnt : cnt;
|
|
|
|
/* return either inputted number or string length */
|
|
putchar('\r');
|
|
return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt);
|
|
}
|
|
|
|
/* internal support routines */
|
|
|
|
static int string_count(pp)
|
|
|
|
register char **pp;
|
|
|
|
{
|
|
register int cnt;
|
|
|
|
cnt = 0;
|
|
while (*pp++ != NULL)
|
|
{
|
|
cnt++;
|
|
}
|
|
return(cnt);
|
|
}
|
|
|
|
static void summary_format(str, numbers, names)
|
|
|
|
char *str;
|
|
int *numbers;
|
|
register char **names;
|
|
|
|
{
|
|
register char *p;
|
|
register int num;
|
|
register char *thisname;
|
|
register int useM = No;
|
|
|
|
/* format each number followed by its string */
|
|
p = str;
|
|
while ((thisname = *names++) != NULL)
|
|
{
|
|
/* get the number to format */
|
|
num = *numbers++;
|
|
|
|
/* display only non-zero numbers */
|
|
if (num > 0)
|
|
{
|
|
/* is this number in kilobytes? */
|
|
if (thisname[0] == 'K')
|
|
{
|
|
/* yes: format it as a memory value */
|
|
p = strecpy(p, format_k(num));
|
|
|
|
/* skip over the K, since it was included by format_k */
|
|
p = strecpy(p, thisname+1);
|
|
}
|
|
else
|
|
{
|
|
p = strecpy(p, itoa(num));
|
|
p = strecpy(p, thisname);
|
|
}
|
|
}
|
|
|
|
/* ignore negative numbers, but display corresponding string */
|
|
else if (num < 0)
|
|
{
|
|
p = strecpy(p, thisname);
|
|
}
|
|
}
|
|
|
|
/* if the last two characters in the string are ", ", delete them */
|
|
p -= 2;
|
|
if (p >= str && p[0] == ',' && p[1] == ' ')
|
|
{
|
|
*p = '\0';
|
|
}
|
|
}
|
|
|
|
static void line_update(old, new, start, line)
|
|
|
|
register char *old;
|
|
register char *new;
|
|
int start;
|
|
int line;
|
|
|
|
{
|
|
register int ch;
|
|
register int diff;
|
|
register int newcol = start + 1;
|
|
register int lastcol = start;
|
|
char cursor_on_line = No;
|
|
char *current;
|
|
|
|
/* compare the two strings and only rewrite what has changed */
|
|
current = old;
|
|
#ifdef DEBUG
|
|
fprintf(debug, "line_update, starting at %d\n", start);
|
|
fputs(old, debug);
|
|
fputc('\n', debug);
|
|
fputs(new, debug);
|
|
fputs("\n-\n", debug);
|
|
#endif
|
|
|
|
/* start things off on the right foot */
|
|
/* this is to make sure the invariants get set up right */
|
|
if ((ch = *new++) != *old)
|
|
{
|
|
if (line - lastline == 1 && start == 0)
|
|
{
|
|
putchar('\n');
|
|
}
|
|
else
|
|
{
|
|
Move_to(start, line);
|
|
}
|
|
cursor_on_line = Yes;
|
|
putchar(ch);
|
|
*old = ch;
|
|
lastcol = 1;
|
|
}
|
|
old++;
|
|
|
|
/*
|
|
* main loop -- check each character. If the old and new aren't the
|
|
* same, then update the display. When the distance from the
|
|
* current cursor position to the new change is small enough,
|
|
* the characters that belong there are written to move the
|
|
* cursor over.
|
|
*
|
|
* Invariants:
|
|
* lastcol is the column where the cursor currently is sitting
|
|
* (always one beyond the end of the last mismatch).
|
|
*/
|
|
do /* yes, a do...while */
|
|
{
|
|
if ((ch = *new++) != *old)
|
|
{
|
|
/* new character is different from old */
|
|
/* make sure the cursor is on top of this character */
|
|
diff = newcol - lastcol;
|
|
if (diff > 0)
|
|
{
|
|
/* some motion is required--figure out which is shorter */
|
|
if (diff < 6 && cursor_on_line)
|
|
{
|
|
/* overwrite old stuff--get it out of the old buffer */
|
|
printf("%.*s", diff, ¤t[lastcol-start]);
|
|
}
|
|
else
|
|
{
|
|
/* use cursor addressing */
|
|
Move_to(newcol, line);
|
|
cursor_on_line = Yes;
|
|
}
|
|
/* remember where the cursor is */
|
|
lastcol = newcol + 1;
|
|
}
|
|
else
|
|
{
|
|
/* already there, update position */
|
|
lastcol++;
|
|
}
|
|
|
|
/* write what we need to */
|
|
if (ch == '\0')
|
|
{
|
|
/* at the end--terminate with a clear-to-end-of-line */
|
|
(void) clear_eol(strlen(old));
|
|
}
|
|
else
|
|
{
|
|
/* write the new character */
|
|
putchar(ch);
|
|
}
|
|
/* put the new character in the screen buffer */
|
|
*old = ch;
|
|
}
|
|
|
|
/* update working column and screen buffer pointer */
|
|
newcol++;
|
|
old++;
|
|
|
|
} while (ch != '\0');
|
|
|
|
/* zero out the rest of the line buffer -- MUST BE DONE! */
|
|
diff = display_width - newcol;
|
|
if (diff > 0)
|
|
{
|
|
memzero(old, diff);
|
|
}
|
|
|
|
/* remember where the current line is */
|
|
if (cursor_on_line)
|
|
{
|
|
lastline = line;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* printable(str) - make the string pointed to by "str" into one that is
|
|
* printable (i.e.: all ascii), by converting all non-printable
|
|
* characters into '?'. Replacements are done in place and a pointer
|
|
* to the original buffer is returned.
|
|
*/
|
|
|
|
char *printable(str)
|
|
|
|
char *str;
|
|
|
|
{
|
|
register char *ptr;
|
|
register char ch;
|
|
|
|
ptr = str;
|
|
while ((ch = *ptr) != '\0')
|
|
{
|
|
if (!isprint(ch))
|
|
{
|
|
*ptr = '?';
|
|
}
|
|
ptr++;
|
|
}
|
|
return(str);
|
|
}
|