quakeIII源码这个不用我多说吧

				#include 
				#include 
				#include "cpp.h"
				
				Includelist	includelist[NINCLUDE];
				
				extern char	*objname;
				
				void
				doinclude(Tokenrow *trp)
				{
					char fname[256], iname[256];
					Includelist *ip;
					int angled, len, fd, i;
				
					trp->tp += 1;
					if (trp->tp>=trp->lp)
						goto syntax;
					if (trp->tp->type!=STRING && trp->tp->type!=LT) {
						len = trp->tp - trp->bp;
						expandrow(trp, "");
						trp->tp = trp->bp+len;
					}
					if (trp->tp->type==STRING) {
						len = trp->tp->len-2;
						if (len > sizeof(fname) - 1)
							len = sizeof(fname) - 1;
						strncpy(fname, (char*)trp->tp->t+1, len);
						angled = 0;
					} else if (trp->tp->type==LT) {
						len = 0;
						trp->tp++;
						while (trp->tp->type!=GT) {
							if (trp->tp>trp->lp || len+trp->tp->len+2 >= sizeof(fname))
								goto syntax;
							strncpy(fname+len, (char*)trp->tp->t, trp->tp->len);
							len += trp->tp->len;
							trp->tp++;
						}
						angled = 1;
					} else
						goto syntax;
					trp->tp += 2;
					if (trp->tp < trp->lp || len==0)
						goto syntax;
					fname[len] = '\0';
					if (fname[0]=='/') {
						fd = open(fname, 0);
						strcpy(iname, fname);
					} else for (fd = -1,i=NINCLUDE-1; i>=0; i--) {
						ip = &includelist[i];
						if (ip->file==NULL || ip->deleted || (angled && ip->always==0))
							continue;
						if (strlen(fname)+strlen(ip->file)+2 > sizeof(iname))
							continue;
						strcpy(iname, ip->file);
						strcat(iname, "/");
						strcat(iname, fname);
						if ((fd = open(iname, 0)) >= 0)
							break;
					}
					if ( Mflag>1 || !angled&&Mflag==1 ) {
						write(1,objname,strlen(objname));
						write(1,iname,strlen(iname));
						write(1,"\n",1);
					}
					if (fd >= 0) {
						if (++incdepth > 10)
							error(FATAL, "#include too deeply nested");
						setsource((char*)newstring((uchar*)iname, strlen(iname), 0), fd, NULL);
						genline();
					} else {
						trp->tp = trp->bp+2;
						error(ERROR, "Could not find include file %r", trp);
					}
					return;
				syntax:
					error(ERROR, "Syntax error in #include");
					return;
				}
				
				/*
				 * Generate a line directive for cursource
				 */
				void
				genline(void)
				{
					static Token ta = { UNCLASS };
					static Tokenrow tr = { &ta, &ta, &ta+1, 1 };
					uchar *p;
				
					ta.t = p = (uchar*)outp;
					strcpy((char*)p, "#line ");
					p += sizeof("#line ")-1;
					p = (uchar*)outnum((char*)p, cursource->line);
					*p++ = ' '; *p++ = '"';
					if (cursource->filename[0]!='/' && wd[0]) {
						strcpy((char*)p, wd);
						p += strlen(wd);
						*p++ = '/';
					}
					strcpy((char*)p, cursource->filename);
					p += strlen((char*)p);
					*p++ = '"'; *p++ = '\n';
					ta.len = (char*)p-outp;
					outp = (char*)p;
					tr.tp = tr.bp;
					puttokens(&tr);
				}
				
				void
				setobjname(char *f)
				{
					int n = strlen(f);
					objname = (char*)domalloc(n+5);
					strcpy(objname,f);
					if(objname[n-2]=='.'){
						strcpy(objname+n-1,"$O: ");
					}else{
						strcpy(objname+n,"$O: ");
					}
				}