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term.c
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term.c
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//
// "$Id: term.c 36942 2020-08-28 15:05:10 $"
//
// tinyTerm -- A minimal serail/telnet/ssh/sftp terminal emulator
//
// term.c is the minimal xterm implementation, only common ESCAPE
// control sequences are supported for apps like top, vi etc.
//
// Copyright 2018-2020 by Yongchao Fan.
//
// This library is free software distributed under GNU GPL 3.0,
// see the license at:
//
// https://github.com/yongchaofan/tinyTerm/blob/master/LICENSE
//
// Please report all bugs and problems on the following page:
//
// https://github.com/yongchaofan/tinyTerm/issues/new
//
#include "tiny.h"
#define isUTF8c(x) (((x)&0xc0)==0x80)
const unsigned char *vt100_Escape(TERM *pt, const unsigned char *sz, int cnt);
const unsigned char *telnet_Options(TERM *pt, const unsigned char *p, int cnt);
void term_Clear(TERM *pt)
{
memset(pt->buff, 0, BUFFERSIZE);
memset(pt->attr, 0, BUFFERSIZE);
memset(pt->line, 0, MAXLINES*sizeof(int));
pt->c_attr = 7;
pt->cursor_y = pt->cursor_x = 0;
pt->screen_y = 0;
pt->sel_left = pt->sel_right = 0;
pt->roll_top = 0;
pt->roll_bot = pt->size_y-1;
pt->bAlterScreen = FALSE;
pt->bAppCursor = FALSE;
pt->bBracket = FALSE;
pt->bGraphic = FALSE;
pt->bEscape = FALSE;
pt->bInsert = FALSE;
pt->bTitle = FALSE;
pt->bOriginMode = FALSE;
pt->bWraparound = TRUE;
pt->bCursor = TRUE;
pt->bPrompt = TRUE;
pt->escape_idx = 0;
pt->xmlIndent = 0;
pt->xmlPreviousIsOpen = TRUE;
memset(pt->tabstops, 0, 256);
for ( int i=0; i<256; i+=8 ) pt->tabstops[i]=1;
}
BOOL term_Construct(TERM *pt)
{
pt->size_x=80;
pt->size_y=25;
pt->bLogging=FALSE;
pt->bEcho=FALSE;
pt->title_idx=0;
strcpy(pt->sPrompt, "> ");
pt->iPrompt=2;
pt->iTimeOut=30;
pt->tl1len=0;
pt->tl1text=NULL;
pt->mtx = CreateMutex(NULL, FALSE, L"term parse mutex");
pt->buff = (char *)malloc(BUFFERSIZE);
pt->attr = (char *)malloc(BUFFERSIZE);
pt->line = (int * )malloc(MAXLINES*sizeof(int));
if ( pt->buff!=NULL && pt->attr!=NULL && pt->line!=NULL ) {
term_Clear(pt);
return TRUE;
}
return FALSE;
}
void term_Destruct(TERM *pt)
{
free(pt->buff);
free(pt->attr);
free(pt->line);
}
void term_Size(TERM *pt, int x, int y)
{
pt->size_x = x;
pt->size_y = y;
pt->roll_top = 0;
pt->roll_bot = pt->size_y-1;
if ( !pt->bAlterScreen ) {
pt->screen_y = max(0, pt->cursor_y-pt->size_y+1);
}
host_Send_Size(pt->host, pt->size_x, pt->size_y);
tiny_Redraw();
}
void term_nextLine(TERM *pt)
{
pt->line[++pt->cursor_y] = pt->cursor_x;
if (pt->line[pt->cursor_y+1]<pt->cursor_x )
pt->line[pt->cursor_y+1]=pt->cursor_x;
if (pt->screen_y==pt->cursor_y-pt->size_y ) pt->screen_y++;
if (pt->cursor_x>=BUFFERSIZE-1024 || pt->cursor_y>=MAXLINES-4 ) {
int i, len = pt->line[4096];
pt->tl1text -= len;
if (pt->tl1text<pt->buff ) {
pt->tl1len -= pt->buff-pt->tl1text;
pt->tl1text = pt->buff;
}
pt->cursor_x -= len;
pt->cursor_y -= 4096;
pt->screen_y -= 4096;
if (pt->screen_y<0 ) pt->screen_y = 0;
memmove(pt->buff, pt->buff+len, BUFFERSIZE-len);
memset(pt->buff+pt->cursor_x, 0, BUFFERSIZE-pt->cursor_x);
memmove(pt->attr, pt->attr+len, BUFFERSIZE-len);
memset(pt->attr+pt->cursor_x, 0, BUFFERSIZE-pt->cursor_x);
for ( i=0; i<pt->cursor_y+2; i++ )
pt->line[i] = pt->line[i+4096]-len;
while ( i<MAXLINES ) pt->line[i++] = 0;
}
}
void term_Parse(TERM *pt, const char *buf, int len)
{
const unsigned char *p=(const unsigned char *)buf;
const unsigned char *zz = p+len;
if ( WaitForSingleObject(pt->mtx, INFINITE)!=WAIT_OBJECT_0 ) return;
if (pt->bLogging ) fwrite( buf, 1, len, pt->fpLogFile);
if (pt->bEscape ) p = vt100_Escape(pt, p, zz-p);
while ( p < zz ) {
unsigned char c = *p++;
if (pt->bTitle ) {
if ( c==0x07 ) {
pt->bTitle = FALSE;
pt->title[pt->title_idx]=0;
tiny_Title(pt->title);
}
else
if (pt->title_idx<63 )
pt->title[pt->title_idx++] = c;
continue;
}
switch ( c ) {
case 0x00:
case 0x0e:
case 0x0f: break;
case 0x07: tiny_Beep();break;
case 0x08:
if (pt->cursor_x>pt->line[pt->cursor_y] ) {
if ( isUTF8c(pt->buff[pt->cursor_x--]) )//utf8 continuation
while ( isUTF8c(pt->buff[pt->cursor_x]) )
pt->cursor_x--;
}
break;
case 0x09: {
int l;
do {
pt->attr[pt->cursor_x] = pt->c_attr;
pt->buff[pt->cursor_x++]=' ';
l=pt->cursor_x-pt->line[pt->cursor_y];
} while ( l<pt->size_x && pt->tabstops[l]==0);
}
break;
case 0x0a:
case 0x0b:
case 0x0c:
if (pt->bAlterScreen || pt->line[pt->cursor_y+2]!=0 ) {
//IND to next line
vt100_Escape(pt, (const unsigned char *)"D", 1);
}
else { //LF and new line
pt->cursor_x = pt->line[pt->cursor_y+1];
pt->attr[pt->cursor_x] = pt->c_attr;
pt->buff[pt->cursor_x++] = c;
term_nextLine(pt);
}
break;
case 0x0d:
if (pt->cursor_x-pt->line[pt->cursor_y]==pt->size_x+1 && *p!=0x0a)
term_nextLine(pt); //soft line feed
else
pt->cursor_x = pt->line[pt->cursor_y];
break;
case 0x1b: p = vt100_Escape(pt, p, zz-p); break;
case 0xff: p = telnet_Options(pt, p-1, zz-p+1); break;
case 0xe2:
if (pt->bAlterScreen ) {
c = ' '; //hack utf8 box drawing
if ( *p++==0x94 ) //to make alterscreen easier
{
switch ( *p ) {
case 0x80:
case 0xac:
case 0xb4:
case 0xbc: c='_'; break;
case 0x82:
case 0x94:
case 0x98:
case 0x9c:
case 0xa4: c='|'; break;
}
}
p++;
}//fall through
default:
if (pt->bGraphic )
switch ( c ) {
case 'q': c='_'; break;
case 'x':
case 't':
case 'u':
case 'm':
case 'j': c='|'; break;
case 'l':
case 'k':
default: c = ' ';
}
if (pt->bInsert )
vt100_Escape(pt, (const unsigned char *)"[1@", 3);
if (pt->cursor_x-pt->line[pt->cursor_y]>=pt->size_x ) {
int char_cnt=0;
for ( int i=pt->line[pt->cursor_y]; i<pt->cursor_x; i++ )
if ( !isUTF8c(pt->buff[i]) ) char_cnt++;
if ( char_cnt==pt->size_x ) {
if (pt->bWraparound )//pt->bAlterScreen
term_nextLine(pt);
else
pt->cursor_x--; //don't overflow in vi
}
}
pt->attr[pt->cursor_x] = pt->c_attr;
pt->buff[pt->cursor_x++] = c;
if (pt->line[pt->cursor_y+1]<pt->cursor_x )
pt->line[pt->cursor_y+1]=pt->cursor_x;
}
}
if ( !pt->bPrompt && pt->cursor_x>pt->iPrompt ) {
char *p=pt->buff+pt->cursor_x-pt->iPrompt;
if ( strncmp(p, pt->sPrompt, pt->iPrompt)==0 ) pt->bPrompt=TRUE;
pt->tl1len = pt->buff+pt->cursor_x - pt->tl1text;
}
tiny_Redraw();
ReleaseMutex(pt->mtx);
}
BOOL term_Echo(TERM *pt)
{
pt->bEcho=!pt->bEcho;
return pt->bEcho;
}
void term_Error(TERM *pt, char *error)
{
term_Print(pt, "\r\n\033[31m%s! \033[37m", error);
term_Disp(pt, "Press \033[33mEnter \033[37mto reconnect\r\n");
}
void term_Title(TERM *pt, char *title)
{
switch ( host_Status(pt->host) ) {
case IDLE:
pt->title[0] = 0;
pt->bEcho = FALSE;
break;
case CONNECTING:
break;
case CONNECTED:
host_Send_Size(pt->host, pt->size_x, pt->size_y);
if ( host_Type(pt->host)==NETCONF ) pt->bEcho = TRUE;
break;
}
strncpy(pt->title, title, 63);
pt->title[63] = 0;
tiny_Title(pt->title);
}
void term_Scroll(TERM *pt, int lines)
{
if ( pt->bAlterScreen ) return;
pt->screen_y -= lines;
if (pt->screen_y<0 || pt->screen_y>pt->cursor_y ) {
pt->screen_y += lines;
return;
}
if ( tiny_Scroll(pt->screen_y<pt->cursor_y-pt->size_y+1,
pt->cursor_y, pt->screen_y) )
pt->screen_y -= lines; //first pageup fix
}
void term_Mouse(TERM *pt, int evt, int x, int y)
{
switch( evt ) {
case DOUBLECLK:
y += pt->screen_y;
pt->sel_left = pt->line[y]+x;
pt->sel_right = pt->sel_left;
while ( --pt->sel_left>pt->line[y] )
if (pt->buff[pt->sel_left]==0x0a
|| pt->buff[pt->sel_left]==0x20 ) {
pt->sel_left++;
break;
}
while ( ++pt->sel_right<pt->line[y+1]) {
if (pt->buff[pt->sel_right]==0x0a
|| pt->buff[pt->sel_right]==0x20 )
break;
}
break;
case LEFTDOWN:
y += pt->screen_y;
pt->sel_left = min(pt->line[y]+x, pt->line[y+1]);
while ( isUTF8c(pt->buff[pt->sel_left]) ) pt->sel_left--;
pt->sel_right = pt->sel_left;
break;
case LEFTDRAG:
if ( y<0 ) {
pt->screen_y += y*2;
if (pt->screen_y<0 ) pt->screen_y = 0;
}
if ( y>pt->size_y) {
pt->screen_y += (y-pt->size_y)*2;
if (pt->screen_y>pt->cursor_y ) pt->screen_y=pt->cursor_y;
}
y += pt->screen_y;
pt->sel_right = min(pt->line[y]+x, pt->line[y+1]);
while ( isUTF8c(pt->buff[pt->sel_right]) ) pt->sel_right++;
break;
case LEFTUP:
if (pt->sel_right!=pt->sel_left ) {
int sel_min = min(pt->sel_left, pt->sel_right);
int sel_max = max(pt->sel_left, pt->sel_right);
pt->sel_left = sel_min;
pt->sel_right = sel_max;
}
else {
pt->sel_left = pt->sel_right = 0;
}
break;
case MIDDLEUP:
if (pt->sel_left!=pt->sel_right )
term_Send(pt, pt->buff+pt->sel_left, pt->sel_right-pt->sel_left);
break;
}
tiny_Redraw();
}
void term_Print(TERM *pt, const char *fmt, ...)
{
char buff[4096];
va_list args;
va_start(args, (char *)fmt);
int len = vsnprintf(buff, 4096, (char *)fmt, args);
va_end(args);
term_Parse(pt, buff, len);
term_Parse(pt, "\033[37m", 5);
}
void term_Disp(TERM *pt, const char *msg )
{
pt->tl1text = pt->buff+pt->cursor_x;
term_Parse(pt, msg, strlen(msg));
}
void term_Send(TERM *pt, char *buf, int len)
{
if (pt->bEcho ) term_Parse(pt, buf, len);
if ( host_Status(pt->host)!=IDLE )
host_Send(pt->host, buf, len);
}
void term_Paste(TERM *pt, char *buf, int len)
{
if (pt->bBracket ) term_Send(pt, "\033[200~", 6);
term_Send(pt, buf, len);
if (pt->bBracket ) term_Send(pt, "\033[201~", 6);
}
int term_Copy(TERM *pt, char **buf)
{
*buf = pt->buff+pt->sel_left;
return pt->sel_right-pt->sel_left;
}
int term_Recv(TERM *pt, char **pTL1text)
{
if ( pTL1text!=NULL ) *pTL1text = pt->tl1text;
int len = pt->buff+pt->cursor_x - pt->tl1text;
pt->tl1text = pt->buff+pt->cursor_x;
return len;
}
void term_Learn_Prompt(TERM *pt)
{//capture prompt for scripting
if (pt->cursor_x>1 ) {
pt->sPrompt[0] = pt->buff[pt->cursor_x-2];
pt->sPrompt[1] = pt->buff[pt->cursor_x-1];
pt->sPrompt[2] = 0;
pt->iPrompt = 2;
}
}
char *term_Mark_Prompt(TERM *pt)
{
pt->bPrompt = FALSE;
pt->tl1len = 0;
pt->tl1text = pt->buff+pt->cursor_x;
return pt->tl1text;
}
int term_Waitfor_Prompt(TERM *pt)
{
int oldlen = 0;
for ( int i=0; i<pt->iTimeOut*10 && !pt->bPrompt; i++ ) {
if (pt->tl1len>oldlen ) { i=0; oldlen=pt->tl1len; }
Sleep(100);
}
pt->bPrompt = TRUE;
return pt->tl1len;
}
void term_Logg(TERM *pt, char *fn)
{
if (pt->bLogging ) {
fclose(pt->fpLogFile);
pt->bLogging = FALSE;
term_Print(pt, "\n\033[33m logging stopped\n");
}
else if ( fn!=NULL ) {
if ( *fn==' ' ) fn++;
pt->fpLogFile = fopen_utf8( fn, "wb");
if (pt->fpLogFile != NULL ) {
pt->bLogging = TRUE;
term_Print(pt, "\n\033[33m%s logging started\n", fn);
}
}
}
int term_Srch(TERM *pt, char *sstr)
{
int l = strlen(sstr);
char *p = pt->buff+pt->sel_left;
if (pt->sel_left==pt->sel_right ) p = pt->buff+pt->cursor_x;
while ( --p>=pt->buff+l ) {
int i;
for ( i=l-1; i>=0; i--) if ( sstr[i]!=p[i-l] ) break;
if ( i==-1 ) { //found a match
pt->sel_left = p-l-pt->buff;
pt->sel_right = p-pt->buff;
for ( i=pt->screen_y; pt->line[i]>pt->sel_left; i--);
term_Scroll(pt, pt->screen_y-i);
return TRUE;
}
}
return FALSE;
}
int term_TL1(TERM *pt, char *cmd, char **pTl1Text)
{
if ( host_Status(pt->host )!=IDLE ) { //retrieve from NE
term_Mark_Prompt(pt);
int cmdlen = strlen(cmd);
term_Send(pt, cmd, cmdlen);
if ( cmd[cmdlen-1]!='\r' ) term_Send(pt, "\r", 1);
term_Waitfor_Prompt(pt);
}
else { //retrieve from buffer
char *pcursor=pt->buff; //only when retrieve from buffer
pt->tl1len = 0;
pt->buff[pt->cursor_x]=0;
char *p = strstr( pcursor, cmd);
if ( p==NULL ) { pcursor = pt->buff; p = strstr(pcursor, cmd); }
if ( p!=NULL ) { p = strstr( p, "\r\n");
if ( p!=NULL ) {
pt->tl1text = p+2;
p = strstr(p, "\nM ");
p = strstr(p, pt->sPrompt);
if ( p!=NULL ) {
pcursor = ++p;
pt->tl1len = pcursor - pt->tl1text;
}
}
}
if (pt->tl1len == 0 ) { pt->tl1text = pt->buff+pt->cursor_x; }
}
if ( pTl1Text!=NULL ) *pTl1Text = pt->tl1text;
return pt->tl1len;
}
int term_Pwd(TERM *pt, char *pwd, int len)
{
char *p1, *p2;
term_TL1(pt,"pwd\r", &p2);
p1 = strchr(p2, 0x0a);
if ( p1!=NULL ) {
p2 = p1+1;
p1 = strchr(p2, 0x0a);
if ( p1!=NULL ) {
if ( len>p1-p2 ) len = p1-p2;
strncpy(pwd, p2, len);
pwd[len]=0;
}
}
else
len = 0;
return len;
}
void escape_space(char *p)
{
do {
p = strchr(p, '\\');
if ( p!=NULL ) {
if ( p[1]==' ' )
for ( char *q=p; *q; q++ ) *q=q[1];
}
} while ( p!=NULL );
}
int term_Scp(TERM *pt, char *cmd, char **preply)
{
if ( host_Type(pt->host )!=SSH ) return 0;
for ( char *q=cmd; *q; q++ ) if ( *q=='\\'&&q[1]!=' ' ) *q='/';
char *p = strchr(cmd, ' ');
while ( p!=NULL ) {
if ( p[-1]!='\\' ) { *p++=0; break; }
p = strchr(p+1, ' ');
}
char *lpath, *rpath, *reply = term_Mark_Prompt(pt);
term_Learn_Prompt(pt);
if ( *cmd==':' ) { //scp_read
lpath = p; rpath = cmd+1;
escape_space(lpath);
char ls_1[1024]="ls -1 ";
if ( *rpath!='/' && *rpath!='~' ) {
term_Pwd(pt, ls_1+6, 1016);
strcat(ls_1, "/");
}
strcat(ls_1, rpath);
if ( strchr(rpath, '*')==NULL
&& strchr(rpath, '?')==NULL ) { //rpath is a single file
reply = term_Mark_Prompt(pt);
strcat(ls_1, "\012");
scp_read(pt->host, lpath, ls_1+6);
}
else { //rpath is a filename pattern
char *rlist, *rfiles;
strcat(ls_1, "\r");
int len = term_TL1(pt, ls_1, &rlist);
if ( len>0 ) {
rlist[len] = 0;
p = strchr(rlist, 0x0a);
if ( p!=NULL ) {
rfiles = strdup(p+1);
reply = term_Mark_Prompt(pt);
scp_read(pt->host, lpath, rfiles);
free(rfiles);
}
}
}
}
else {//scp_write
lpath = cmd; rpath = p+1; //*p is expected to be ':' here
char lsld[1024]="ls -ld ";
if ( *rpath!='/' && *rpath!='~' ) { //rpath is relative
term_Pwd(pt, lsld+7, 1017);
if ( *rpath ) strcat(lsld, "/");
}
strcat(lsld, rpath);
strcat(lsld, "\r");
if ( lsld[strlen(lsld)-1]!='/' ) {
char *rlist;
if ( term_TL1(pt, lsld, &rlist )>0 ) {//check if rpath is a dir
lsld[strlen(lsld)-1] = 0;
p = strchr(rlist, 0x0a);
if ( p!=NULL ) { //append '/' if yes
if ( p[1]=='d' ) strcat(lsld, "/");
}
}
}
reply = term_Mark_Prompt(pt);
escape_space(lsld+7);
escape_space(lpath);
scp_write(pt->host, lpath, lsld+7);
}
term_Send(pt, "\r", 1);
if ( preply!=NULL ) *preply = reply;
return term_Waitfor_Prompt(pt);
}
int term_Tun(TERM *pt, char *cmd, char **preply)
{
if ( host_Type(pt->host)!=SSH ) return 0;
char *reply = term_Mark_Prompt(pt);
if ( preply!=NULL ) *preply = reply;
ssh2_Tun(pt->host, cmd);
return term_Waitfor_Prompt(pt);
}
int term_xmodem(TERM *pt, char *fn)
{
if ( host_Type(pt->host)==SERIAL ) {
FILE *fp = fopen(fn, "rb");
if ( fp!=NULL ) {
term_Disp(pt, "sending ");
term_Disp(pt, fn);
term_Disp(pt, "\n");
xmodem_init(pt->host, fp);
return 1;
}
}
return 0;
}
int term_Cmd(TERM *pt, char *cmd, char **preply)
{
if ( *cmd!='!' ) return term_TL1(pt, cmd, preply);
int rc = 0;
if ( strncmp(++cmd, "Clear",5)==0 ) term_Clear(pt);
else if ( strncmp(cmd, "Log", 3)==0 ) term_Logg(pt, cmd+3);
else if ( strncmp(cmd, "Find ",5)==0 ) term_Srch(pt, cmd+5);
else if ( strncmp(cmd, "Disp ",5)==0 ) term_Disp(pt, cmd+5);
else if ( strncmp(cmd, "Send ",5)==0 ) {
term_Mark_Prompt(pt);
term_Send(pt, cmd+5,strlen(cmd+5));
}
else if ( strncmp(cmd, "Hostname",8)==0) {
if ( preply!=NULL ) {
*preply = host_Status(pt->host)==IDLE ? "":pt->host->hostname;
rc = strlen(*preply);
}
}
else if ( strncmp(cmd,"Selection",9)==0) {
if ( preply!=NULL ) *preply = pt->buff+pt->sel_left;
rc = pt->sel_right-pt->sel_left;
}
else if ( strncmp(cmd, "Recv" ,4)==0 ) rc = term_Recv(pt, preply);
else if ( strncmp(cmd, "Echo", 4)==0 ) rc = term_Echo(pt ) ? 1 : 0;
else if ( strncmp(cmd, "Timeout",7)==0 )pt->iTimeOut = atoi( cmd+8);
else if ( strncmp(cmd, "Prompt",6)==0 ) {
if ( cmd[6]==' ' ) {
strncpy(pt->sPrompt, cmd+7, 31);
pt->sPrompt[31] = 0;
pt->iPrompt = url_decode(pt->sPrompt);
}
else {
term_Learn_Prompt(pt);
}
if ( preply!=NULL ) *preply = pt->sPrompt;
rc = pt->iPrompt;
}
else if ( strncmp(cmd, "Tftpd",5)==0 ) tftp_Svr(cmd+5);
else if ( strncmp(cmd, "Ftpd", 4)==0 ) ftp_Svr(cmd+4);
else if ( strncmp(cmd, "tun", 3)==0 ) rc = term_Tun(pt, cmd+3, preply);
else if ( strncmp(cmd, "scp ", 4)==0 ) rc = term_Scp(pt, cmd+4, preply);
else if ( strncmp(cmd, "xmodem ", 7)==0 ) rc = term_xmodem(pt, cmd+7);
else if ( strncmp(cmd, "Wait ", 5)==0 ) Sleep(atoi(cmd+5)*1000);
else if ( strncmp(cmd, "Waitfor ", 8)==0) {
for ( int i=pt->iTimeOut; i>0; i-- ) {
pt->buff[pt->cursor_x] = 0;
if ( strstr(pt->tl1text, cmd+8)!=NULL ) {
if ( preply!=NULL ) *preply = pt->tl1text;
rc = pt->buff+pt->cursor_x-pt->tl1text;
break;
}
Sleep(1000);
}
}
else {
term_Mark_Prompt(pt);
host_Open(pt->host, cmd);
if ( preply!=NULL ) {
term_Waitfor_Prompt(pt); //added for scripting
*preply = pt->tl1text;
rc = pt->tl1len;
}
}
return rc;
}
void buff_clear(TERM *pt, int offset, int len)
{
memset(pt->buff+offset, ' ', len);
memset(pt->attr+offset, 7, len);
}
void screen_clear(TERM *pt, int m0)
{
/*mostly [2J used after [?1049h to clear screen
and when screen size changed during vi or raspi-config
flashwave TL1 use it without [?1049h for splash screen
freeBSD use it without [?1049h* for top and vi*/
int lines = pt->size_y;
if ( m0==2 ) pt->screen_y = pt->cursor_y;
if ( m0==1 ) {
lines = pt->cursor_y-pt->screen_y;
buff_clear(pt, pt->line[pt->cursor_y],
pt->cursor_x-pt->line[pt->cursor_y]+1);
pt->cursor_y = pt->screen_y;
}
if ( m0==0 ) {
buff_clear(pt, pt->cursor_x,
pt->line[pt->cursor_y+1]-pt->cursor_x);
lines = pt->size_y+pt->screen_y-pt->cursor_y;
}
pt->cursor_x = pt->line[pt->cursor_y];
int cy = pt->cursor_y;
for ( int i=0; i<lines; i++ )
{
buff_clear(pt, pt->cursor_x, pt->size_x);
pt->cursor_x += pt->size_x;
term_nextLine(pt);
}
pt->cursor_y = cy;
if ( m0==2 || m0==0 ) pt->screen_y--;
pt->cursor_x = pt->line[pt->cursor_y];
}
void check_cursor_y(TERM *pt)
{
if (pt->cursor_y < pt->screen_y )
pt->cursor_y = pt->screen_y;
if (pt->cursor_y > pt->screen_y+pt->size_y-1 )
pt->cursor_y = pt->screen_y+pt->size_y-1;
if (pt->bOriginMode ) {
if (pt->cursor_y< pt->screen_y+pt->roll_top )
pt->cursor_y = pt->screen_y+pt->roll_top;
if (pt->cursor_y> pt->screen_y+pt->roll_bot )
pt->cursor_y = pt->screen_y+pt->roll_bot;
}
}
const unsigned char *vt100_Escape(TERM *pt, const unsigned char *sz, int cnt)
{
const unsigned char *zz = sz+cnt;
pt->bEscape = TRUE;
while ( sz<zz && pt->bEscape )
{
if ( *sz>31 ) {
pt->escape_code[pt->escape_idx++] = *sz++;
}
else { //handle control character in escape sequence
switch ( *sz++ ) {
case 0x08: //BS
if ( isUTF8c(pt->buff[pt->cursor_x--]) )
//utf8 continuation byte
while ( isUTF8c(pt->buff[pt->cursor_x]) )
pt->cursor_x--;
break;
case 0x0b:{ //VT
int x = pt->cursor_x - pt->line[pt->cursor_y];
pt->cursor_x = pt->line[++pt->cursor_y] + x;
break;
}
case 0x0d: //CR
pt->cursor_x = pt->line[pt->cursor_y];
}
}
switch(pt->escape_code[0] )
{
case '[': if ( isalpha(pt->escape_code[pt->escape_idx-1])
|| pt->escape_code[pt->escape_idx-1]=='@'
|| pt->escape_code[pt->escape_idx-1]=='`' )
{
pt->bEscape = FALSE;
int m0=0; //ESC[J == ESC[0J ESC[K==ESC[0K
int n0=1; //ESC[A == ESC[1A
int n1=1; //n1;n0 used by ESC[Ps;PtH and ESC[Ps;Ptr
if ( isdigit(pt->escape_code[1]) ) {
m0 = n0 = atoi(pt->escape_code+1);
if ( n0==0 ) n0 = 1;//ESC[0A == ESC[1A
}
char *p = strchr(pt->escape_code, ';');
if ( p != NULL ) {
n1 = n0 ;
n0 = atoi(p+1);
if ( n0==0 ) n0=1; //ESC[0;0f == ESC[1;1f
}
int x;
switch (pt->escape_code[pt->escape_idx-1] )
{
case 'A'://cursor up n0 lines
x = pt->cursor_x - pt->line[pt->cursor_y];
pt->cursor_y -= n0;
check_cursor_y(pt);
pt->cursor_x = pt->line[pt->cursor_y]+x;
break;
case 'd'://line position absolute
x = pt->cursor_x-pt->line[pt->cursor_y];
pt->cursor_y = pt->screen_y+n0-1;
check_cursor_y(pt);
pt->cursor_x = pt->line[pt->cursor_y]+x;
break;
case 'e'://line position relative
case 'B'://cursor down n0 lines
x = pt->cursor_x - pt->line[pt->cursor_y];
pt->cursor_y += n0;
check_cursor_y(pt);
pt->cursor_x = pt->line[pt->cursor_y]+x;
break;
case '`': //character position absolute
case 'G': //cursor to n0th position from left
pt->cursor_x = pt->line[pt->cursor_y];
//fall through
case 'a'://character position relative
case 'C'://cursor right n0 characters
while ( n0-->0 &&
pt->cursor_x<pt->line[pt->cursor_y]+pt->size_x-1 )
{
if ( isUTF8c(pt->buff[++pt->cursor_x]) )
while ( isUTF8c(pt->buff[++pt->cursor_x]));
}
break;
case 'D'://cursor left n0 characters
while ( n0-->0 && pt->cursor_x>pt->line[pt->cursor_y]) {
if ( isUTF8c(pt->buff[--pt->cursor_x]) )
while ( isUTF8c(pt->buff[--pt->cursor_x]));
}
break;
case 'E': //cursor to begining of next line n0 times
pt->cursor_y += n0;
check_cursor_y(pt);
pt->cursor_x = pt->line[pt->cursor_y];
break;
case 'F': //cursor to begining of previous line n0 times
pt->cursor_y -= n0;
check_cursor_y(pt);
pt->cursor_x = pt->line[pt->cursor_y];
break;
case 'f': //horizontal and vertical position forced
for ( int i=pt->cursor_y+1; i<pt->screen_y+n1; i++ )
if ( i<MAXLINES && pt->line[i]<pt->cursor_x )
pt->line[i]=pt->cursor_x;
case 'H': //cursor to line n1, postion n0
if ( !pt->bAlterScreen && n1>pt->size_y ) {
pt->cursor_y = (pt->screen_y++) + pt->size_y;
}
else {
pt->cursor_y = pt->screen_y+n1-1;
if (pt->bOriginMode ) pt->cursor_y+=pt->roll_top;
check_cursor_y(pt);
}
pt->cursor_x = pt->line[pt->cursor_y];
while ( --n0>0 ) {
pt->cursor_x++;
while ( isUTF8c(pt->buff[pt->cursor_x]) ) pt->cursor_x++;
}
break;
case 'J': //[J kill till end, 1J begining, 2J entire screen
if ( isdigit(pt->escape_code[1]) ) {
screen_clear(pt, m0);
}
else {
pt->line[pt->cursor_y+1] = pt->cursor_x;
for ( int i=pt->cursor_y+2;
i<=pt->screen_y+pt->size_y+1; i++ )
if ( i<MAXLINES ) pt->line[i] = 0;
}
break;
case 'K': { //[K kill till end, 1K begining, 2K entire line
int i = pt->line[pt->cursor_y]; //setup for m0==2
int j = pt->line[pt->cursor_y+1];
if ( m0==0 ) i = pt->cursor_x; //change start if m0==0
if ( m0==1 ) j = pt->cursor_x+1; //change stop if m0==1
if ( j>i ) buff_clear(pt, i, j-i);
}
break;
case 'L'://insert lines
if ( n0 > pt->screen_y+pt->roll_bot-pt->cursor_y )
n0 = pt->screen_y+pt->roll_bot-pt->cursor_y+1;
else {
for ( int i=pt->screen_y+pt->roll_bot;
i>=pt->cursor_y+n0; i--) {
memcpy(pt->buff+pt->line[i],
pt->buff+pt->line[i-n0], pt->size_x);
memcpy(pt->attr+pt->line[i],
pt->attr+pt->line[i-n0], pt->size_x);
}
}
pt->cursor_x = pt->line[pt->cursor_y];
buff_clear(pt, pt->cursor_x, pt->size_x*n0);
break;
case 'M'://delete lines
if ( n0 > pt->screen_y+pt->roll_bot-pt->cursor_y )
n0 = pt->screen_y+pt->roll_bot-pt->cursor_y+1;
else {
for ( int i=pt->cursor_y;
i<=pt->screen_y+pt->roll_bot-n0; i++ ) {
memcpy(pt->buff+pt->line[i],
pt->buff+pt->line[i+n0], pt->size_x);
memcpy(pt->attr+pt->line[i],
pt->attr+pt->line[i+n0], pt->size_x);
}
}
pt->cursor_x = pt->line[pt->cursor_y];
buff_clear(pt, pt->line[pt->screen_y+pt->roll_bot-n0+1],
pt->size_x*n0);
break;
case 'P'://delete n0 characters, fill with space to the right margin
for (int i=pt->cursor_x;i<pt->line[pt->cursor_y+1]-n0;i++){
pt->buff[i]=pt->buff[i+n0];
pt->attr[i]=pt->attr[i+n0];
}
buff_clear(pt, pt->line[pt->cursor_y+1]-n0, n0);
if ( !pt->bAlterScreen ) {
pt->line[pt->cursor_y+1]-=n0;
if ( pt->line[pt->cursor_y+1]<pt->line[pt->cursor_y] )
pt->line[pt->cursor_y+1] =pt->line[pt->cursor_y];
}
break;
case '@'://insert n0 spaces
for (int i=pt->line[pt->cursor_y+1]-n0-1;i>=pt->cursor_x; i--){
pt->buff[i+n0]=pt->buff[i];
pt->attr[i+n0]=pt->attr[i];
}
if ( !pt->bAlterScreen ){
pt->line[pt->cursor_y+1]+=n0;
if ( pt->line[pt->cursor_y+1]>pt->line[pt->cursor_y]
+pt->size_x )
pt->line[pt->cursor_y+1] =pt->line[pt->cursor_y]
+pt->size_x;
}
//fall through;
case 'X': //erase n0 characters
buff_clear(pt, pt->cursor_x, n0);
break;
case 'S': // scroll up n0 lines
for ( int i=pt->roll_top; i<=pt->roll_bot-n0; i++ ) {
memcpy(pt->buff+pt->line[pt->screen_y+i],
pt->buff+pt->line[pt->screen_y+i+n0],
pt->size_x);
memcpy(pt->attr+pt->line[pt->screen_y+i],
pt->attr+pt->line[pt->screen_y+i+n0],
pt->size_x);
}
buff_clear(pt, pt->line[pt->screen_y+pt->roll_bot-n0+1],
n0*pt->size_x);
break;
case 'T': // scroll down n0 lines
for ( int i=pt->roll_bot; i>=pt->roll_top+n0; i-- ) {
memcpy(pt->buff+pt->line[pt->screen_y+i],
pt->buff+pt->line[pt->screen_y+i-n0],
pt->size_x);
memcpy(pt->attr+pt->line[pt->screen_y+i],
pt->attr+pt->line[pt->screen_y+i-n0],
pt->size_x);
}
buff_clear(pt, pt->line[pt->screen_y+pt->roll_top],
n0*pt->size_x);
break;
case 'I': //cursor forward n0 tab stops
break;
case 'Z': //cursor backward n0 tab stops
break;
case 'c'://Send Device Attributes
host_Send(pt->host, "\033[?1;0c", 7); //vt100 without options
break;
case 'g': //clear tabstop
if ( m0==0 ) { //clear current tabstop
int l = pt->cursor_x - pt->line[pt->cursor_y];
pt->tabstops[l] = 0;
}
if ( m0==3 ) { //clear all tabstops
memset(pt->tabstops, 0, 256);
}
break;
case 'h':
if (pt->escape_code[1]=='4' ) pt->bInsert = TRUE;
if (pt->escape_code[1]=='?' ) {
n0 = atoi(pt->escape_code+2);
if ( n0==1 ) pt->bAppCursor = TRUE;
if ( n0==3 ) {
if (pt->size_x!=132 || pt->size_y!=25 ) {
pt->size_x = 132; pt->size_y = 25;
wnd_Size();
}
screen_clear(pt, 2);
}
if ( n0==6 ) pt->bOriginMode = TRUE;
if ( n0==7 ) pt->bWraparound = TRUE;
if ( n0==25 ) pt->bCursor = TRUE;
if ( n0==2004 ) pt->bBracket = TRUE;
if ( n0==1049 ) { //?1049h alternate screen,
pt->bAlterScreen = TRUE;
screen_clear(pt, 2);
}
}
break;
case 'l':
if (pt->escape_code[1]=='4' ) pt->bInsert = FALSE;
if (pt->escape_code[1]=='?' ) {
n0 = atoi(pt->escape_code+2);
if ( n0==1 ) pt->bAppCursor = FALSE;
if ( n0==3 ) {
if (pt->size_x!=80 || pt->size_y!=25 ) {
pt->size_x = 80; pt->size_y = 25;
wnd_Size();
}
screen_clear(pt, 2);
}
if ( n0==6 ) pt->bOriginMode = FALSE;
if ( n0==7 ) pt->bWraparound = FALSE;
if ( n0==25 ) pt->bCursor = FALSE;
if ( n0==2004 ) pt->bBracket = FALSE;
if ( n0==1049 ) { //?1049l exit alternate screen,
pt->bAlterScreen = FALSE;
pt->cursor_y = pt->screen_y;
pt->cursor_x = pt->line[pt->cursor_y];
for ( int i=1; i<=pt->size_y+1; i++ )
pt->line[pt->cursor_y+i] = 0;
pt->screen_y = pt->cursor_y-pt->size_y+1;
if (pt->screen_y<0 ) pt->screen_y = 0;
}
}
break;
case 'm': {
char *p = pt->escape_code;
while ( p!=NULL ) {