sh: Eliminate some gotos.

svn path=/head/; revision=272575

bin/sh/eval.c

@@ -316,9 +316,10 @@ evalloop(union node *n, int flags)
 	loopnest++;
 	status = 0;
 	for (;;) {
-		evaltree(n->nbinary.ch1, EV_TESTED);
+		if (!evalskip)
+			evaltree(n->nbinary.ch1, EV_TESTED);
 		if (evalskip) {
-skipping:	  if (evalskip == SKIPCONT && --skipcount <= 0) {
+			if (evalskip == SKIPCONT && --skipcount <= 0) {
 				evalskip = 0;
 				continue;
 			}
@@ -337,8 +338,6 @@ skipping:	  if (evalskip == SKIPCONT && --skipcount <= 0) {
 		}
 		evaltree(n->nbinary.ch2, flags);
 		status = exitstatus;
-		if (evalskip)
-			goto skipping;
 	}
 	loopnest--;
 	exitstatus = status;
@@ -648,15 +647,15 @@ evalbackcmd(union node *n, struct backcmd *result)
 	struct jmploc *savehandler;
 	struct localvar *savelocalvars;
 
-	setstackmark(&smark);
 	result->fd = -1;
 	result->buf = NULL;
 	result->nleft = 0;
 	result->jp = NULL;
 	if (n == NULL) {
 		exitstatus = 0;
-		goto out;
+		return;
 	}
+	setstackmark(&smark);
 	exitstatus = oexitstatus;
 	if (is_valid_fast_cmdsubst(n)) {
 		savelocalvars = localvars;
@@ -698,7 +697,6 @@ evalbackcmd(union node *n, struct backcmd *result)
 		result->fd = pip[0];
 		result->jp = jp;
 	}
-out:
 	popstackmark(&smark);
 	TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n",
 		result->fd, result->buf, result->nleft, result->jp));

bin/sh/expand.c

@@ -328,24 +328,19 @@ exptilde(char *p, int flag)
 done:
 	*p = '\0';
 	if (*(startp+1) == '\0') {
-		if ((home = lookupvar("HOME")) == NULL)
-			goto lose;
+		home = lookupvar("HOME");
 	} else {
-		if ((pw = getpwnam(startp+1)) == NULL)
-			goto lose;
-		home = pw->pw_dir;
+		pw = getpwnam(startp+1);
+		home = pw != NULL ? pw->pw_dir : NULL;
 	}
-	if (*home == '\0')
-		goto lose;
 	*p = c;
+	if (home == NULL || *home == '\0')
+		return (startp);
 	if (quotes)
 		STPUTS_QUOTES(home, SQSYNTAX, expdest);
 	else
 		STPUTS(home, expdest);
 	return (p);
-lose:
-	*p = c;
-	return (startp);
 }
 
 

bin/sh/jobs.c

@@ -373,13 +373,13 @@ showjob(struct job *jp, int mode)
 			strcat(statestr, " (core dumped)");
 	}
 
-	for (ps = jp->ps ; ; ps++) {	/* for each process */
+	for (ps = jp->ps ; procno > 0 ; ps++, procno--) { /* for each process */
 		if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
 			out1fmt("%d\n", (int)ps->pid);
-			goto skip;
+			continue;
 		}
 		if (mode != SHOWJOBS_VERBOSE && ps != jp->ps)
-			goto skip;
+			continue;
 		if (jobno == curr && ps == jp->ps)
 			c = '+';
 		else if (jobno == prev && ps == jp->ps)
@@ -410,8 +410,6 @@ showjob(struct job *jp, int mode)
 			out1c('\n');
 		} else
 			printjobcmd(jp);
-skip:		if (--procno <= 0)
-			break;
 	}
 }
 

bin/sh/redir.c

@@ -173,21 +173,12 @@ openredirect(union node *redir, char memory[10])
 		fname = redir->nfile.expfname;
 		if ((f = open(fname, O_RDONLY)) < 0)
 			error("cannot open %s: %s", fname, strerror(errno));
-movefd:
-		if (f != fd) {
-			if (dup2(f, fd) == -1) {
-				e = errno;
-				close(f);
-				error("%d: %s", fd, strerror(e));
-			}
-			close(f);
-		}
 		break;
 	case NFROMTO:
 		fname = redir->nfile.expfname;
 		if ((f = open(fname, O_RDWR|O_CREAT, 0666)) < 0)
 			error("cannot create %s: %s", fname, strerror(errno));
-		goto movefd;
+		break;
 	case NTO:
 		if (Cflag) {
 			fname = redir->nfile.expfname;
@@ -205,19 +196,19 @@ openredirect(union node *redir, char memory[10])
 			} else
 				error("cannot create %s: %s", fname,
 				    strerror(EEXIST));
-			goto movefd;
+			break;
 		}
 		/* FALLTHROUGH */
 	case NCLOBBER:
 		fname = redir->nfile.expfname;
 		if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
 			error("cannot create %s: %s", fname, strerror(errno));
-		goto movefd;
+		break;
 	case NAPPEND:
 		fname = redir->nfile.expfname;
 		if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
 			error("cannot create %s: %s", fname, strerror(errno));
-		goto movefd;
+		break;
 	case NTOFD:
 	case NFROMFD:
 		if (redir->ndup.dupfd >= 0) {	/* if not ">&-" */
@@ -231,14 +222,22 @@ openredirect(union node *redir, char memory[10])
 		} else {
 			close(fd);
 		}
-		break;
+		return;
 	case NHERE:
 	case NXHERE:
 		f = openhere(redir);
-		goto movefd;
+		break;
 	default:
 		abort();
 	}
+	if (f != fd) {
+		if (dup2(f, fd) == -1) {
+			e = errno;
+			close(f);
+			error("%d: %s", fd, strerror(e));
+		}
+		close(f);
+	}
 }
 
 

bin/sh/trap.c

@@ -510,28 +510,25 @@ exitshell_savedstatus(void)
 			exiting_exitstatus = oexitstatus;
 	}
 	exitstatus = oexitstatus = exiting_exitstatus;
-	if (setjmp(loc1.loc)) {
-		goto l1;
+	if (!setjmp(loc1.loc)) {
+		handler = &loc1;
+		if ((p = trap[0]) != NULL && *p != '\0') {
+			/*
+			 * Reset evalskip, or the trap on EXIT could be
+			 * interrupted if the last command was a "return".
+			 */
+			evalskip = 0;
+			trap[0] = NULL;
+			evalstring(p, 0);
+		}
 	}
-	if (setjmp(loc2.loc)) {
-		goto l2;
-	}
-	handler = &loc1;
-	if ((p = trap[0]) != NULL && *p != '\0') {
-		/*
-		 * Reset evalskip, or the trap on EXIT could be
-		 * interrupted if the last command was a "return".
-		 */
-		evalskip = 0;
-		trap[0] = NULL;
-		evalstring(p, 0);
-	}
-l1:   handler = &loc2;			/* probably unnecessary */
-	flushall();
+	if (!setjmp(loc2.loc)) {
+		handler = &loc2;		/* probably unnecessary */
+		flushall();
 #if JOBS
-	setjobctl(0);
+		setjobctl(0);
 #endif
-l2:
+	}
 	if (sig != 0 && sig != SIGSTOP && sig != SIGTSTP && sig != SIGTTIN &&
 	    sig != SIGTTOU) {
 		signal(sig, SIG_DFL);