path: root/package/busybox/busybox-1.13.3-ash.patch

diff -urpN busybox-1.13.3/shell/ash.c busybox-1.13.3-ash/shell/ash.c
--- busybox-1.13.3/shell/ash.c	2009-02-26 12:46:55.000000000 +0100
+++ busybox-1.13.3-ash/shell/ash.c	2009-04-01 01:16:44.000000000 +0200
@@ -30,7 +30,7 @@
  */
 
 /*
- * The follow should be set to reflect the type of system you have:
+ * The following should be set to reflect the type of system you have:
  *      JOBS -> 1 if you have Berkeley job control, 0 otherwise.
  *      define SYSV if you are running under System V.
  *      define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
@@ -40,6 +40,11 @@
  * a quit signal will generate a core dump.
  */
 #define DEBUG 0
+/* Tweak debug output verbosity here */
+#define DEBUG_TIME 0
+#define DEBUG_PID 1
+#define DEBUG_SIG 1
+
 #define PROFILE 0
 
 #define IFS_BROKEN
@@ -47,9 +52,9 @@
 #define JOBS ENABLE_ASH_JOB_CONTROL
 
 #if DEBUG
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
+# ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+# endif
 #endif
 
 #include "busybox.h" /* for applet_names */
@@ -57,15 +62,15 @@
 #include <setjmp.h>
 #include <fnmatch.h>
 #if JOBS || ENABLE_ASH_READ_NCHARS
-#include <termios.h>
+# include <termios.h>
 #endif
 
 #ifndef PIPE_BUF
-#define PIPE_BUF 4096           /* amount of buffering in a pipe */
+# define PIPE_BUF 4096           /* amount of buffering in a pipe */
 #endif
 
 #if defined(__uClinux__)
-#error "Do not even bother, ash will not run on uClinux"
+# error "Do not even bother, ash will not run on uClinux"
 #endif
 
 
@@ -76,14 +81,6 @@
 #define CMDTABLESIZE 31         /* should be prime */
 
 
-/* ============ Misc helpers */
-
-#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
-
-/* C99 say: "char" declaration may be signed or unsigned default */
-#define signed_char2int(sc) ((int)((signed char)sc))
-
-
 /* ============ Shell options */
 
 static const char *const optletters_optnames[] = {
@@ -245,7 +242,30 @@ extern struct globals_misc *const ash_pt
 } while (0)
 
 
+/* ============ DEBUG */
+#if DEBUG
+static void trace_printf(const char *fmt, ...);
+static void trace_vprintf(const char *fmt, va_list va);
+# define TRACE(param)    trace_printf param
+# define TRACEV(param)   trace_vprintf param
+# define close(f) do { \
+	int dfd = (f); \
+	if (close(dfd) < 0) \
+		bb_error_msg("bug on %d: closing %d(%x)", \
+			__LINE__, dfd, dfd); \
+} while (0)
+#else
+# define TRACE(param)
+# define TRACEV(param)
+#endif
+
+
 /* ============ Utility functions */
+#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
+
+/* C99 say: "char" declaration may be signed or unsigned by default */
+#define signed_char2int(sc) ((int)(signed char)(sc))
+
 static int isdigit_str9(const char *str)
 {
 	int maxlen = 9 + 1; /* max 9 digits: 999999999 */
@@ -284,6 +304,12 @@ raise_exception(int e)
 	exception = e;
 	longjmp(exception_handler->loc, 1);
 }
+#if DEBUG
+#define raise_exception(e) do { \
+	TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
+	raise_exception(e); \
+} while (0)
+#endif
 
 /*
  * Called from trap.c when a SIGINT is received.  (If the user specifies
@@ -316,6 +342,12 @@ raise_interrupt(void)
 	raise_exception(i);
 	/* NOTREACHED */
 }
+#if DEBUG
+#define raise_interrupt() do { \
+	TRACE(("raising interrupt on line %d\n", __LINE__)); \
+	raise_interrupt(); \
+} while (0)
+#endif
 
 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
 static void
@@ -334,7 +366,9 @@ force_int_on(void)
 		raise_interrupt();
 }
 #define FORCE_INT_ON force_int_on()
-#else
+
+#else /* !ASH_OPTIMIZE_FOR_SIZE */
+
 #define INT_ON do { \
 	xbarrier(); \
 	if (--suppressint == 0 && intpending) \
@@ -346,7 +380,7 @@ force_int_on(void)
 	if (intpending) \
 		raise_interrupt(); \
 } while (0)
-#endif /* ASH_OPTIMIZE_FOR_SIZE */
+#endif /* !ASH_OPTIMIZE_FOR_SIZE */
 
 #define SAVE_INT(v) ((v) = suppressint)
 
@@ -376,7 +410,6 @@ static void
 onsig(int signo)
 {
 	gotsig[signo - 1] = 1;
-	pendingsig = signo;
 
 	if (/* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
 		if (!suppressint) {
@@ -384,6 +417,8 @@ onsig(int signo)
 			raise_interrupt(); /* does not return */
 		}
 		intpending = 1;
+	} else {
+		pendingsig = signo;
 	}
 }
 
@@ -684,6 +719,12 @@ trace_printf(const char *fmt, ...)
 
 	if (debug != 1)
 		return;
+	if (DEBUG_TIME)
+		fprintf(tracefile, "%u ", (int) time(NULL));
+	if (DEBUG_PID)
+		fprintf(tracefile, "[%u] ", (int) getpid());
+	if (DEBUG_SIG)
+		fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
 	va_start(va, fmt);
 	vfprintf(tracefile, fmt, va);
 	va_end(va);
@@ -694,6 +735,12 @@ trace_vprintf(const char *fmt, va_list v
 {
 	if (debug != 1)
 		return;
+	if (DEBUG_TIME)
+		fprintf(tracefile, "%u ", (int) time(NULL));
+	if (DEBUG_PID)
+		fprintf(tracefile, "[%u] ", (int) getpid());
+	if (DEBUG_SIG)
+		fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
 	vfprintf(tracefile, fmt, va);
 }
 
@@ -998,14 +1045,6 @@ showtree(union node *n)
 	shtree(n, 1, NULL, stdout);
 }
 
-#define TRACE(param)    trace_printf param
-#define TRACEV(param)   trace_vprintf param
-
-#else
-
-#define TRACE(param)
-#define TRACEV(param)
-
 #endif /* DEBUG */
 
 
@@ -3779,7 +3818,7 @@ dowait(int wait_flags, struct job *job)
 	 * NB: _not_ safe_waitpid, we need to detect EINTR */
 	pid = waitpid(-1, &status,
 			(doing_jobctl ? (wait_flags | WUNTRACED) : wait_flags));
-	TRACE(("wait returns pid=%d, status=0x%x\n", pid, status));
+	TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n", pid, status, errno, strerror(errno)));
 
 	if (pid <= 0) {
 		/* If we were doing blocking wait and (probably) got EINTR,
@@ -5031,7 +5070,9 @@ redirect(union node *redir, int flags)
 		if (newfd < 0) {
 			/* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
 			if (redir->ndup.dupfd < 0) { /* "fd>&-" */
-				close(fd);
+				/* Don't want to trigger debugging */
+				if (fd != -1)
+					close(fd);
 			} else {
 				copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
 			}
@@ -5084,7 +5125,7 @@ popredir(int drop, int restore)
 				/*close(fd);*/
 				copyfd(copy, fd | COPYFD_EXACT);
 			}
-			close(copy);
+			close(copy & ~COPYFD_RESTORE);
 		}
 	}
 	redirlist = rp->next;
@@ -7871,20 +7912,30 @@ dotrap(void)
 	pendingsig = 0;
 	xbarrier();
 
+	TRACE(("dotrap entered\n"));
 	for (i = 1, q = gotsig; i < NSIG; i++, q++) {
 		if (!*q)
 			continue;
-		*q = '\0';
 
 		p = trap[i];
+		/* non-trapped SIGINT is handled separately by raise_interrupt,
+		 * don't upset it by resetting gotsig[SIGINT-1] */
+		if (i == SIGINT && !p)
+			continue;
+
+		TRACE(("sig %d is active, will run handler '%s'\n", i, p));
+		*q = '\0';
 		if (!p)
 			continue;
 		skip = evalstring(p, SKIPEVAL);
 		exitstatus = savestatus;
-		if (skip)
+		if (skip) {
+			TRACE(("dotrap returns %d\n", skip));
 			return skip;
+		}
 	}
 
+	TRACE(("dotrap returns 0\n"));
 	return 0;
 }
 
@@ -7906,28 +7957,32 @@ static void prehash(union node *);
 static void
 evaltree(union node *n, int flags)
 {
-
 	struct jmploc *volatile savehandler = exception_handler;
 	struct jmploc jmploc;
 	int checkexit = 0;
 	void (*evalfn)(union node *, int);
 	int status;
+	int int_level;
+
+	SAVE_INT(int_level);
 
 	if (n == NULL) {
 		TRACE(("evaltree(NULL) called\n"));
 		goto out1;
 	}
-	TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
-			getpid(), n, n->type, flags));
+	TRACE(("evaltree(%p: %d, %d) called\n",	n, n->type, flags));
 
 	exception_handler = &jmploc;
 	{
 		int err = setjmp(jmploc.loc);
 		if (err) {
 			/* if it was a signal, check for trap handlers */
-			if (exception == EXSIG)
+			if (exception == EXSIG) {
+				TRACE(("exception %d (EXSIG) in evaltree, err=%d\n", exception, err));
 				goto out;
+			}
 			/* continue on the way out */
+			TRACE(("exception %d in evaltree, propagating err=%d\n", exception, err));
 			exception_handler = savehandler;
 			longjmp(exception_handler->loc, err);
 		}
@@ -8010,7 +8065,8 @@ evaltree(union node *n, int flags)
 		if (exitstatus == 0) {
 			n = n->nif.ifpart;
 			goto evaln;
-		} else if (n->nif.elsepart) {
+		}
+		if (n->nif.elsepart) {
 			n = n->nif.elsepart;
 			goto evaln;
 		}
@@ -8036,6 +8092,9 @@ evaltree(union node *n, int flags)
  exexit:
 		raise_exception(EXEXIT);
 	}
+
+	RESTORE_INT(int_level);
+	TRACE(("leaving evaltree (no interrupts)\n"));
 }
 
 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
@@ -8281,7 +8340,9 @@ evalpipe(union node *n, int flags)
 		if (prevfd >= 0)
 			close(prevfd);
 		prevfd = pip[0];
-		close(pip[1]);
+		/* Don't want to trigger debugging */
+		if (pip[1] != -1)
+			close(pip[1]);
 	}
 	if (n->npipe.pipe_backgnd == 0) {
 		exitstatus = waitforjob(jp);
@@ -8913,6 +8974,7 @@ evalcommand(union node *cmd, int flags)
 			if (forkshell(jp, cmd, FORK_FG) != 0) {
 				exitstatus = waitforjob(jp);
 				INT_ON;
+				TRACE(("forked child exited with %d\n", exitstatus));
 				break;
 			}
 			FORCE_INT_ON;
@@ -12391,7 +12453,7 @@ readcmd(int argc UNUSED_PARAM, char **ar
 #endif
 
 	status = 0;
-	startword = 1;
+	startword = 2;
 	backslash = 0;
 #if ENABLE_ASH_READ_TIMEOUT
 	if (timeout) /* NB: ensuring end_ms is nonzero */
@@ -12399,6 +12461,8 @@ readcmd(int argc UNUSED_PARAM, char **ar
 #endif
 	STARTSTACKSTR(p);
 	do {
+		const char *is_ifs;
+
 #if ENABLE_ASH_READ_TIMEOUT
 		if (end_ms) {
 			struct pollfd pfd[1];
@@ -12428,25 +12492,34 @@ readcmd(int argc UNUSED_PARAM, char **ar
 			continue;
 		}
 		if (!rflag && c == '\\') {
-			backslash++;
+			backslash = 1;
 			continue;
 		}
 		if (c == '\n')
 			break;
-		if (startword && *ifs == ' ' && strchr(ifs, c)) {
-			continue;
+		is_ifs = strchr(ifs, c);
+		if (startword && is_ifs) {
+			if (isspace(c))
+				continue;
+			/* non-space ifs char */
+			startword--;
+			if (startword == 1) /* first one? */
+				continue;
 		}
 		startword = 0;
-		if (ap[1] != NULL && strchr(ifs, c) != NULL) {
+		if (ap[1] != NULL && is_ifs) {
+			const char *beg;
 			STACKSTRNUL(p);
-			setvar(*ap, stackblock(), 0);
+			beg = stackblock();
+			setvar(*ap, beg, 0);
 			ap++;
-			startword = 1;
+			/* can we skip one non-space ifs? (2: yes) */
+			startword = isspace(c) ? 2 : 1;
 			STARTSTACKSTR(p);
-		} else {
- put:
-			STPUTC(c, p);
+			continue;
 		}
+ put:
+		STPUTC(c, p);
 	}
 /* end of do {} while: */
 #if ENABLE_ASH_READ_NCHARS
@@ -12460,8 +12533,8 @@ readcmd(int argc UNUSED_PARAM, char **ar
 #endif
 
 	STACKSTRNUL(p);
-	/* Remove trailing blanks */
-	while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
+	/* Remove trailing space ifs chars */
+	while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
 		*p = '\0';
 	setvar(*ap, stackblock(), 0);
 	while (*++ap != NULL)
@@ -13640,7 +13713,7 @@ int ash_main(int argc UNUSED_PARAM, char
 	exception_handler = &jmploc;
 #if DEBUG
 	opentrace();
-	trace_puts("Shell args: ");
+	TRACE(("Shell args: "));
 	trace_puts_args(argv);
 #endif
 	rootpid = getpid();
@@ -13692,8 +13765,14 @@ int ash_main(int argc UNUSED_PARAM, char
 	}
  state3:
 	state = 4;
-	if (minusc)
+	if (minusc) {
+		/* evalstring pushes parsefile stack.
+		 * Ensure we don't falsely claim that 0 (stdin)
+		 * is one of stacked source fds */
+		if (!sflag)
+			g_parsefile->fd = -1;
 		evalstring(minusc, 0);
+	}
 
 	if (sflag || minusc == NULL) {
 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
@@ -13720,14 +13799,6 @@ int ash_main(int argc UNUSED_PARAM, char
 	/* NOTREACHED */
 }
 
-#if DEBUG
-const char *applet_name = "debug stuff usage";
-int main(int argc, char **argv)
-{
-	return ash_main(argc, argv);
-}
-#endif
-
 
 /*-
  * Copyright (c) 1989, 1991, 1993, 1994
diff -urpN busybox-1.13.3/shell/ash_test/ash-read/read_ifs.right busybox-1.13.3-ash/shell/ash_test/ash-read/read_ifs.right
--- busybox-1.13.3/shell/ash_test/ash-read/read_ifs.right	1970-01-01 01:00:00.000000000 +0100
+++ busybox-1.13.3-ash/shell/ash_test/ash-read/read_ifs.right	2009-04-01 01:16:44.000000000 +0200
@@ -0,0 +1,7 @@
+.a. .b. .c.
+.a. .b. .c.
+.a. .. .b,c.
+.a. .. .b,c.
+.a. .. .c.
+.a. .. .c. .d.
+.a. .. .b,c,d  ,  ,.
diff -urpN busybox-1.13.3/shell/ash_test/ash-read/read_ifs.tests busybox-1.13.3-ash/shell/ash_test/ash-read/read_ifs.tests
--- busybox-1.13.3/shell/ash_test/ash-read/read_ifs.tests	1970-01-01 01:00:00.000000000 +0100
+++ busybox-1.13.3-ash/shell/ash_test/ash-read/read_ifs.tests	2009-04-01 01:16:44.000000000 +0200
@@ -0,0 +1,7 @@
+printf 'a\t\tb\tc\n' | ( IFS=$(printf "\t") read a b c; echo ".$a. .$b. .$c." )
+printf 'a\t\tb\tc\n' | ( IFS=$(printf " \t") read a b c; echo ".$a. .$b. .$c." )
+printf 'a,,b,c\n'    | ( IFS="," read a b c; echo ".$a. .$b. .$c." )
+printf 'a,,b,c\n'    | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
+printf 'a ,, c\n'    | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
+printf 'a ,, c d\n'  | ( IFS=" ," read a b c d; echo ".$a. .$b. .$c. .$d." )
+printf ' a,,b,c,d  ,  ,\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )