Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!julius.cs.uiuc.edu!ux1.cso.uiuc.edu!midway!oddjob!malagoli From: malagoli@oddjob.uchicago.edu (Andrea Malagoli) Newsgroups: comp.sys.sgi Subject: Lockscreen Message-ID: <1990Sep17.170536.27140@midway.uchicago.edu> Date: 17 Sep 90 17:05:36 GMT Sender: news@midway.uchicago.edu (News Administrator) Reply-To: malagoli@oddjob.UChicago.EDU () Distribution: usa Organization: U of Chicago - Astronomy & Astrophysics Lines: 402 This is my first posting to the network. I have developed a lockscreen utility for Irises 4D. It works on my PI. I am no expert C programmer, so I would appreciate receiving comments and/or revised versions of this program. Andrea Malagoli Astronomy Department University of Chicago 5640 S.Ellis Ave. Chicago, IL 60613 e-mail: malagoli@mhd4.uchicago.edu -------------------------cut here---------------------------- /* * L O C K S C R E E N * * lockscreen utiliy for the SGI machines * * lockscreen allows a user to lock the access to the monitor * without logging out. This is useful when one needs to go * out of the office and does not want to leave the machine * accessible to anybody. * * After calling lockscreen, the screen gets blank and a bouncing * ball appears on a black background. To unlock, press the * RIGHT MOUSE BUTTON. When the prompt asking for the password * appears, just enter the correct password. * * Just compile with * cc -o lockscreen lockscreen.c -lgl_s * * This code has been written borrowing some routines available * in 4Dgifts/examples/grafix. * * WRITTEN BY: Andrea Malagoli * Astronomy Department * University of Chicago * malagoli@mhd.uchicago.edu * DATE: 15 June 1990 * */ #include #include #include #include #include Icoord maxxval; /* width of prompt window ( in screen coords) */ long menu; /* defined menu's identifier */ long oldmode; /* previous drawmode */ char filename[20]; /* array to store standard input for the prompt */ struct passwd mypwd; /* User information from /etc/passwd */ int curpos, prevpos; /* cursor current and previous positions */ long xvelocity = 0, yvelocity = 0; /* initial ball velocity */ int iter=1; #define XMIN 0 #define XMAX XMAXSCREEN #define YMIN 0 #define YMAX YMAXSCREEN /* setup for the prompt box */ Screencoord mask1, mask2, mask3, mask4; /* full window */ main() { Device dev; short val; long menuval; int check_pwd(); init(); hyde_cursor(); xvelocity = (long int) (rand(0.6)/32767.*150); yvelocity = (long int) (rand(0.3)/32767.*150); /* process events forever */ while(TRUE) { drawball(); while( qtest() ){ dev=qread(&val); switch(dev) { case RIGHTMOUSE: if(val) { color( BLUE ); clear(); swapbuffers(); mktxtport(); if(check_pwd(filename) == 1){ endit(); break; } else break; } break; default: break; } } } } endit() { clr_overlay(); gexit(); exit(0); } init() { /* do all the basic graphics setup */ ginit(); /* enable overlay, and be sure rubber band box will be red */ drawmode(OVERDRAW); overlay(2); mapcolor(BLACK, 0, 0, 0); mapcolor(RED, 255, 0, 0); drawmode(NORMALDRAW); doublebuffer(); gconfig(); maxxval = 590; /* prompt window's width in pixels */ /* initial values for restoring screenmask */ getscrmask(&mask1, &mask2, &mask3, &mask4); qdevice(RIGHTMOUSE); } clearpup() { /* clear the pup plane where we asked for the filename */ setupprompt(0); color(PUP_CLEAR); clear(); /* clear the PUPDRAW plane */ endprompt(); } clr_overlay() { /* clear any left over junk in overlay and pup planes */ drawmode(OVERDRAW); color(BLACK); clear(); drawmode(PUPDRAW); color(PUP_CLEAR); clear(); drawmode(NORMALDRAW); } /* screen positionings of prompt box */ #define FILEX 340 #define FILEY 500 #define FILEYHI (30+FILEY) /* 30 pixels hi */ #define TEXTX (FILEX+5) #define TEXTY (FILEY+10) /* Clear prompt, move to start of prompt box, and output requested prompt */ clearprompt(prmpt) char *prmpt; { color(PUP_WHITE); clear(); color(PUP_BLACK); linewidth(2); recti(FILEX+2, FILEY+2, FILEX+maxxval-6, FILEYHI-3); linewidth(1); cmov2i(TEXTX, TEXTY); charstr(prmpt); } setupprompt(sav) { if(sav) oldmode = getdrawmode(); drawmode(PUPDRAW); /* so can clear just text */ scrmask(FILEX, (Screencoord)(FILEX+maxxval-6), FILEY, FILEYHI); } endprompt() { scrmask(mask1, mask2, mask3, mask4); /* restore old */ drawmode(oldmode); } mktxtport() /* get name of file */ { int curstrlen; short c; char *cc = "a"; char *str; Device dev; long maxwidth; size_t maxlen = sizeof(filename); static char fprompt[] = "Enter Password for "; char *prmpt = fprompt; mypwd = *getpwuid( getuid() ); /* Get User ID and encrypted password */ prmpt = strcat(fprompt,mypwd.pw_name); prmpt = strcat(prmpt,": "); maxwidth = (XMAXSCREEN-11) - (FILEX + strwidth(fprompt)); setupprompt(1); /* display prompt */ curstrlen = 0; clearprompt(prmpt); prevpos = curpos; curpos = TEXTX + strwidth(prmpt) + 2; draw_bar(); qdevice(KEYBD); /* read until carriage return or linefeed */ while(dev = qread(&c)) { if(dev != KEYBD) continue; /* don't care */ switch(c) { case '\027': /* ctrl-W sets back to start of prompt */ curstrlen = 0; clearprompt(prmpt); prevpos = curpos; curpos = TEXTX + strwidth(prmpt) + 2; draw_bar(); break; case '\n': case '\r': goto done; case '\b': if(curstrlen) { *cc = filename[--curstrlen]; filename[curstrlen] = '\0'; clearprompt(prmpt); /* display rightmost portion */ for(str=filename; *str && strwidth(str) > maxwidth; str++); prevpos = curpos; curpos = curpos - strwidth(cc); draw_bar(); /* charstr(str); */ } break; default: str = &filename[curstrlen]; filename[curstrlen++] = c; filename[curstrlen] = '\0'; *cc = c; prevpos = curpos; curpos = curpos + strwidth(cc); draw_bar(); /* charstr(str); */ break; } } done: unqdevice(KEYBD); endprompt(); clearpup(); clr_overlay(); } int check_pwd(char *pww) { char *salt="12"; strncpy(salt, mypwd.pw_passwd, 2); if( strcmp(mypwd.pw_passwd,crypt(pww,salt)) == 0 ){ return 1; } else { return 0; } } drawball() { static xpos = 500,ypos = 500; long radius = 20; if( iter >= 200 ) { xvelocity = (long int) (rand(0.6)/32767.*60); yvelocity = (long int) (rand(0.3)/32767.*60); iter = 0; } iter++; color(BLACK); clear(); xpos += xvelocity; ypos += yvelocity; if (xpos > XMAX - radius || xpos < XMIN + radius) { xpos -= xvelocity; xvelocity = -xvelocity; } if (ypos > YMAX - radius || ypos < YMIN + radius) { ypos -= yvelocity; yvelocity = -yvelocity; } color(YELLOW); circfi(xpos, ypos, radius); swapbuffers(); } hyde_cursor() { short index; static short blank[16][16]={{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}; curstype(C16X1); drawmode(CURSORDRAW); defcursor(1, blank); setcursor(1, 0, 0); drawmode(NORMALDRAW); } draw_bar() { static int ydown = (FILEY + 5); static int yup = (FILEYHI - 7); int vert[2]; linewidth(1); if( prevpos != curpos ){ color( PUP_WHITE ); bgnline(); vert[0] = prevpos; vert[1] = ydown; v2i(vert); vert[0] = prevpos; vert[1] = yup; v2i(vert); endline; color( PUP_BLACK ); bgnline(); vert[0] = curpos; vert[1] = ydown; v2i(vert); vert[0] = curpos; vert[1] = yup; v2i(vert); endline; } else { color( PUP_BLACK ); bgnline(); vert[0] = curpos; vert[1] = ydown; v2i(vert); vert[0] = curpos; vert[1] = yup; v2i(vert); endline; } }