pass a copy of argv[i] to NOFORK applets (they may permute it etc).

set/save/restore more shared global variables whan call one applet from another

applets/applets.c

@@ -33,7 +33,7 @@
 
 #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
 /* Define usage_messages[] */
-static const char usage_messages[] =
+static const char usage_messages[] = ""
 #define MAKE_USAGE
 #include "usage.h"
 #include "applets.h"
@@ -590,6 +590,10 @@ static int busybox_main(int argc, char **argv)
 
 void run_current_applet_and_exit(int argc, char **argv)
 {
+	/* Reinit some shared global data */
+	optind = 1;
+	xfunc_error_retval = EXIT_FAILURE;
+
 	applet_name = current_applet->name;
 	if (argc == 2 && !strcmp(argv[1], "--help"))
 		bb_show_usage();

libbb/vfork_daemon_rexec.c

@@ -119,11 +119,16 @@ int spawn_and_wait(char **argv)
 		if (a->nofork)
 #endif
 		{
-			int old_sleep = die_sleep;
+			/* Save some shared globals */
+			const struct bb_applet *old_a = current_applet;
 			int old_x = xfunc_error_retval;
 			uint32_t old_m = option_mask32;
+			int old_sleep = die_sleep;
 
+			current_applet = a;
+			applet_name = a->name;
 			xfunc_error_retval = EXIT_FAILURE;
+			/*option_mask32 = 0; - not needed */
 			/* special flag for xfunc_die(). If xfunc will "die"
 			 * in NOFORK applet, xfunc_die() sees negative
 			 * die_sleep and longjmp here instead. */
@@ -131,25 +136,24 @@ int spawn_and_wait(char **argv)
 
 			rc = setjmp(die_jmp);
 			if (!rc) {
-				const struct bb_applet *old_a = current_applet;
-				current_applet = a;
-				applet_name = a->name;
-// what else should we save/restore?
-// TODO: what if applet will mangle argv vector?
-// xargs needs argv untouched because it frees argv[i]!
-// shouldn't we pass a copy?
-				rc = a->main(argc, argv);
-				current_applet = old_a;
-				applet_name = old_a->name;					
-			} else {
-				/* xfunc died in NOFORK applet */
+				/* Some callers (xargs)
+				 * need argv untouched because they free argv[i]! */
+				char *tmp_argv[argc+1];
+				memcpy(tmp_argv, argv, (argc+1) * sizeof(tmp_argv[0]));
+				/* Finally we can call NOFORK applet's main() */
+				rc = a->main(argc, tmp_argv);
+			} else { /* xfunc died in NOFORK applet */
+				/* in case they meant to return 0... */
 				if (rc == -111)
 					rc = 0;
 			}
 
-			die_sleep = old_sleep;
+			/* Restoring globals */
+			current_applet = old_a;
+			applet_name = old_a->name;					
 			xfunc_error_retval = old_x;
 			option_mask32 = old_m;
+			die_sleep = old_sleep;
 			return rc;
 		}
 #if BB_MMU

shell/hush.c

@@ -1119,8 +1119,7 @@ static void pseudo_exec(struct child_prog *child)
 
 			/* Count argc for use in a second... */
 			for (argc_l = 0; *argv_l; argv_l++, argc_l++)
-				/**/;
-			optind = 1;
+				continue;
 			debug_printf("running applet %s\n", name);
 			run_applet_and_exit(name, argc_l, child->argv);
 		}

shell/lash.c

@@ -32,6 +32,7 @@
 #define ENABLE_LASH_PIPE_N_REDIRECTS 1
 #define ENABLE_LASH_JOB_CONTROL      1
 
+
 enum { MAX_READ = 128 }; /* size of input buffer for 'read' builtin */
 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
 
@@ -408,12 +409,12 @@ static int builtin_read(struct child_prog *child)
 		** the string resides in a static buffer!)
 		*/
 		res = -1;
-		if ((s = strdup(string)))
+		s = strdup(string);
+		if (s)
 			res = putenv(s);
 		if (res)
 			bb_perror_msg("read");
-	}
-	else
+	} else
 		fgets(string, sizeof(string), stdin);
 
 	return res;
@@ -1167,8 +1168,8 @@ static int pseudo_exec(struct child_prog *child)
 		char **argv_l = child->argv;
 		int argc_l;
 
-		for (argc_l = 0; *argv_l; argv_l++, argc_l++);
-		optind = 1;
+		for (argc_l = 0; *argv_l; argv_l++, argc_l++)
+			continue;
 		run_applet_and_exit(child->argv[0], argc_l, child->argv);
 	}
 
@@ -1275,11 +1276,11 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
 		}
 
 #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
-		if (!(child->pid = fork()))
+		child->pid = fork();
 #else
-		if (!(child->pid = vfork()))
+		child->pid = vfork();
 #endif
-		{
+		if (!child->pid) {
 			/* Set the handling for job control signals back to the default.  */
 			signal(SIGINT, SIG_DFL);
 			signal(SIGQUIT, SIG_DFL);
@@ -1474,7 +1475,8 @@ static void setup_job_control(void)
 
 	/* Loop until we are in the foreground.  */
 	while ((status = tcgetpgrp(shell_terminal)) >= 0) {
-		if (status == (shell_pgrp = getpgrp ())) {
+		shell_pgrp = getpgrp();
+		if (status == shell_pgrp) {
 			break;
 		}
 		kill(- shell_pgrp, SIGTTIN);

shell/msh.c

@@ -3065,7 +3065,6 @@ static const char *rexecve(char *c, char **v, char **envp)
 	char *name = c;
 
 	if (ENABLE_FEATURE_SH_STANDALONE) {
-		optind = 1;
 		if (find_applet_by_name(name)) {
 			/* We have to exec here since we vforked.  Running
 			 * run_applet_and_exit() won't work and bad things