?? lp.c
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#/* *//* * LP-11 Line printer driver */#include "../param.h"#include "../conf.h"#include "../user.h"#define LPADDR 0177514#define IENABLE 0100#define DONE 0200#define LPPRI 10#define LPLWAT 50#define LPHWAT 100#define EJLINE 60#define MAXCOL 80struct { int lpsr; int lpbuf;};struct { int cc; int cf; int cl; int flag; int mcc; int ccc; int mlc;} lp11;#define CAP 01 /* Set to 0 for 96-char printer, else to 01 */#define EJECT 02#define OPEN 04#define IND 010 /* Set to 0 for no indent, else to 010 */#define FORM 014lpopen(dev, flag){ if(lp11.flag & OPEN || LPADDR->lpsr < 0) { u.u_error = EIO; return; } lp11.flag =| (IND|EJECT|OPEN); LPADDR->lpsr =| IENABLE; lpcanon(FORM);}lpclose(dev, flag){ lpcanon(FORM); lp11.flag = 0;}lpwrite(){ register int c; while ((c=cpass())>=0) lpcanon(c);}lpcanon(c){ register c1, c2; c1 = c; if(lp11.flag&CAP) { if(c1>='a' && c1<='z') c1 =+ 'A'-'a'; else switch(c1) { case '{': c2 = '('; goto esc; case '}': c2 = ')'; goto esc; case '`': c2 = '\''; goto esc; case '|': c2 = '!'; goto esc; case '~': c2 = '^'; esc: lpcanon(c2); lp11.ccc--; c1 = '-'; } } switch(c1) { case '\t': lp11.ccc = (lp11.ccc+8) & ~7; return; case FORM: case '\n': if((lp11.flag&EJECT) == 0 || lp11.mcc!=0 || lp11.mlc!=0) { lp11.mcc = 0; lp11.mlc++; if(lp11.mlc >= EJLINE && lp11.flag&EJECT) c1 = FORM; lpoutput(c1); if(c1 == FORM) lp11.mlc = 0; } case '\r': lp11.ccc = 0; if(lp11.flag&IND) lp11.ccc = 8; return; case 010: if(lp11.ccc > 0) lp11.ccc--; return; case ' ': lp11.ccc++; return; default: if(lp11.ccc < lp11.mcc) { lpoutput('\r'); lp11.mcc = 0; } if(lp11.ccc < MAXCOL) { while(lp11.ccc > lp11.mcc) { lpoutput(' '); lp11.mcc++; } lpoutput(c1); lp11.mcc++; } lp11.ccc++; }}lpstart(){ register int c; while (LPADDR->lpsr&DONE && (c = getc(&lp11)) >= 0) LPADDR->lpbuf = c;}lpint(){ register int c; lpstart(); if (lp11.cc == LPLWAT || lp11.cc == 0) wakeup(&lp11);}lpoutput(c){ if (lp11.cc >= LPHWAT) sleep(&lp11, LPPRI); putc(c, &lp11); spl4(); lpstart(); spl0();}?? 快捷鍵說明
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