void Xwrite(void) { char *file; int f; switch(count(runq->argv->words)){ default: Xerror1("> requires singleton\n"); return; case 0: Xerror1("> requires file\n"); return; case 1: break; } file = runq->argv->words->word; if((f = Creat(file))<0){ pfmt(err, "%s: ", file); Xerror("can't open"); return; } pushredir(ROPEN, f, runq->code[runq->pc].i); runq->pc++; poplist(); }
void Xdup(void) { pushredir(RDUP, runq->code[runq->pc].i, runq->code[runq->pc+1].i); runq->pc+=2; }
void execdot(void) { int iflag = 0; int fd; list *av; thread *p = runq; char *zero; static int first = 1; char file[512]; word *path; if(first){ dotcmds[0].i = 1; dotcmds[1].f = Xmark; dotcmds[2].f = Xword; dotcmds[3].s="0"; dotcmds[4].f = Xlocal; dotcmds[5].f = Xmark; dotcmds[6].f = Xword; dotcmds[7].s="*"; dotcmds[8].f = Xlocal; dotcmds[9].f = Xrdcmds; dotcmds[10].f = Xunlocal; dotcmds[11].f = Xunlocal; dotcmds[12].f = Xreturn; first = 0; } else eflagok = 1; popword(); if(p->argv->words && strcmp(p->argv->words->word, "-i")==0){ iflag = 1; popword(); } /* get input file */ if(p->argv->words==0){ Xerror1("Usage: . [-i] file [arg ...]"); return; } zero = strdup(p->argv->words->word); popword(); fd=-1; for(path = searchpath(zero);path;path = path->next){ strcpy(file, path->word); if(file[0]) strcat(file, "/"); strcat(file, zero); if((fd = open(file, 0))>=0) break; if(strcmp(file, "/dev/stdin")==0){ /* for sun & ucb */ fd = Dup1(0); if(fd>=0) break; } } if(fd<0){ pfmt(err, "%s: ", zero); setstatus("can't open"); Xerror(".: can't open"); return; } /* set up for a new command loop */ start(dotcmds, 1, (struct var *)0); pushredir(RCLOSE, fd, 0); runq->cmdfile = zero; runq->cmdfd = openfd(fd); runq->iflag = iflag; runq->iflast = 0; /* push $* value */ pushlist(); runq->argv->words = p->argv->words; /* free caller's copy of $* */ av = p->argv; p->argv = av->next; efree((char *)av); /* push $0 value */ pushlist(); pushword(zero); ndot++; }
void Xclose(void) { pushredir(RCLOSE, runq->code[runq->pc].i, 0); runq->pc++; }
void evaltree(union node *n, int flags) { int checkexit = 0; void (*evalfn)(union node *, int); unsigned isor; int status; if (n == NULL) { TRACE(("evaltree(NULL) called\n")); goto out; } #ifndef SMALL displayhist = 1; /* show history substitutions done with fc */ #endif TRACE(("pid %d, evaltree(%p: %d, %d) called\n", getpid(), n, n->type, flags)); switch (n->type) { default: #ifdef DEBUG out1fmt("Node type = %d\n", n->type); #ifndef USE_GLIBC_STDIO flushout(out1); #endif break; #endif case NNOT: evaltree(n->nnot.com, EV_TESTED); status = !exitstatus; goto setstatus; case NREDIR: errlinno = lineno = n->nredir.linno; if (funcline) lineno -= funcline - 1; expredir(n->nredir.redirect); pushredir(n->nredir.redirect); status = redirectsafe(n->nredir.redirect, REDIR_PUSH); if (!status) { evaltree(n->nredir.n, flags & EV_TESTED); status = exitstatus; } if (n->nredir.redirect) popredir(0); goto setstatus; case NCMD: #ifdef notyet if (eflag && !(flags & EV_TESTED)) checkexit = ~0; evalcommand(n, flags, (struct backcmd *)NULL); break; #else evalfn = evalcommand; checkexit: if (eflag && !(flags & EV_TESTED)) checkexit = ~0; goto calleval; #endif case NFOR: evalfn = evalfor; goto calleval; case NWHILE: case NUNTIL: evalfn = evalloop; goto calleval; case NSUBSHELL: case NBACKGND: evalfn = evalsubshell; goto checkexit; case NPIPE: evalfn = evalpipe; goto checkexit; case NCASE: evalfn = evalcase; goto calleval; case NAND: case NOR: case NSEMI: #if NAND + 1 != NOR #error NAND + 1 != NOR #endif #if NOR + 1 != NSEMI #error NOR + 1 != NSEMI #endif isor = n->type - NAND; evaltree( n->nbinary.ch1, (flags | ((isor >> 1) - 1)) & EV_TESTED ); if (!exitstatus == isor) break; if (!evalskip) { n = n->nbinary.ch2; evaln: evalfn = evaltree; calleval: evalfn(n, flags); break; } break; case NIF: evaltree(n->nif.test, EV_TESTED); if (evalskip) break; if (exitstatus == 0) { n = n->nif.ifpart; goto evaln; } else if (n->nif.elsepart) { n = n->nif.elsepart; goto evaln; } goto success; case NDEFUN: defun(n); success: status = 0; setstatus: exitstatus = status; break; } out: if (checkexit & exitstatus) goto exexit; if (pendingsigs) dotrap(); if (flags & EV_EXIT) { exexit: exraise(EXEXIT); } }