hush: add support for ':'; create testsuite entries

   text    data     bss     dec     hex filename
 809569     612    7044  817225   c7849 busybox_old
 809528     612    7044  817184   c7820 busybox_unstripped

11 files changed, 47 insertions, 25 deletions

diff --git a/scripts/trylink b/scripts/trylink
index c24d49d52..adc045ad8 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -126,11 +126,12 @@ try $CC $CFLAGS $LDFLAGS \
 while test "$LDLIBS"; do
     $debug && echo "Trying libraries: $LDLIBS"
     all_needed=true
+    last_needed=false
     for one in $LDLIBS; do
         without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs`
         # "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
         l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
-        test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
+        test x"$l_list" != x"" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
         $debug && echo "Trying -l options: '$l_list'"
         try $CC $CFLAGS $LDFLAGS \
                 -o $EXE \
@@ -143,16 +144,19 @@ while test "$LDLIBS"; do
             echo " Library $one is not needed"
             LDLIBS="$without_one"
             all_needed=false
+            last_needed=false
         else
             echo " Library $one is needed"
+            last_needed=true
         fi
     done
     # All libs were needed, can't remove any
     $all_needed && break
-    # If there is no space char, the list has just one lib.
-    # I'm not sure that in this case lib really is 100% needed.
-    # Let's try linking without it anyway... thus commented out.
-    #{ echo "$LDLIBS" | grep -q ' '; } || break
+    # Optimization: was the last tried lib needed?
+    if $last_needed; then
+        # Was it the only one lib left? Don't test again then.
+        { echo "$LDLIBS" | grep -q ' '; } || break
+    fi
 done
 
 # Make the binary with final, minimal list of libs
diff --git a/shell/hush.c b/shell/hush.c
index 222fd9fb5..a84bb92dc 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -615,6 +615,7 @@ static int builtin_help(char **argv);
 static int builtin_pwd(char **argv);
 static int builtin_read(char **argv);
 static int builtin_test(char **argv);
+static int builtin_true(char **argv);
 static int builtin_set(char **argv);
 static int builtin_shift(char **argv);
 static int builtin_source(char **argv);
@@ -629,10 +630,10 @@ static int builtin_unset(char **argv);
  * For example, 'unset foo | whatever' will parse and run, but foo will
  * still be set at the end. */
 struct built_in_command {
-        const char *cmd;                /* name */
-        int (*function) (char **argv);  /* function ptr */
+        const char *cmd;
+        int (*function)(char **argv);
 #if ENABLE_HUSH_HELP
-        const char *descr;              /* description */
+        const char *descr;
 #define BLTIN(cmd, func, help) { cmd, func, help }
 #else
 #define BLTIN(cmd, func, help) { cmd, func }
@@ -642,24 +643,25 @@ struct built_in_command {
 /* For now, echo and test are unconditionally enabled.
  * Maybe make it configurable? */
 static const struct built_in_command bltins[] = {
+        BLTIN("."     , builtin_source, "Run commands in a file"),
+        BLTIN(":"     , builtin_true, "No-op"),
         BLTIN("["     , builtin_test, "Test condition"),
         BLTIN("[["    , builtin_test, "Test condition"),
 #if ENABLE_HUSH_JOB
         BLTIN("bg"    , builtin_fg_bg, "Resume a job in the background"),
 #endif
 //      BLTIN("break" , builtin_not_written, "Exit for, while or until loop"),
-        BLTIN("cd"    , builtin_cd, "Change working directory"),
+        BLTIN("cd"    , builtin_cd, "Change directory"),
 //      BLTIN("continue", builtin_not_written, "Continue for, while or until loop"),
         BLTIN("echo"  , builtin_echo, "Write strings to stdout"),
         BLTIN("eval"  , builtin_eval, "Construct and run shell command"),
-        BLTIN("exec"  , builtin_exec, "Exec command, replacing this shell with the exec'd process"),
-        BLTIN("exit"  , builtin_exit, "Exit from shell"),
+        BLTIN("exec"  , builtin_exec, "Execute command, don't return to shell"),
+        BLTIN("exit"  , builtin_exit, "Exit"),
         BLTIN("export", builtin_export, "Set environment variable"),
 #if ENABLE_HUSH_JOB
         BLTIN("fg"    , builtin_fg_bg, "Bring job into the foreground"),
-        BLTIN("jobs"  , builtin_jobs, "Lists the active jobs"),
+        BLTIN("jobs"  , builtin_jobs, "List active jobs"),
 #endif
-// TODO: remove pwd? we have it as an applet...
         BLTIN("pwd"   , builtin_pwd, "Print current directory"),
         BLTIN("read"  , builtin_read, "Input environment variable"),
 //      BLTIN("return", builtin_not_written, "Return from a function"),
@@ -667,14 +669,12 @@ static const struct built_in_command bltins[] = {
         BLTIN("shift" , builtin_shift, "Shift positional parameters"),
 //      BLTIN("trap"  , builtin_not_written, "Trap signals"),
         BLTIN("test"  , builtin_test, "Test condition"),
-//      BLTIN("ulimit", builtin_not_written, "Controls resource limits"),
-        BLTIN("umask" , builtin_umask, "Sets file creation mask"),
+//      BLTIN("ulimit", builtin_not_written, "Control resource limits"),
+        BLTIN("umask" , builtin_umask, "Set file creation mask"),
         BLTIN("unset" , builtin_unset, "Unset environment variable"),
-        BLTIN("."     , builtin_source, "Source-in and run commands in a file"),
 #if ENABLE_HUSH_HELP
         BLTIN("help"  , builtin_help, "List shell built-in commands"),
 #endif
-        BLTIN(NULL, NULL, NULL)
 };
 
 /* Signals are grouped, we handle them in batches */
@@ -810,6 +810,12 @@ static const char *set_cwd(void)
 }
 
 
+/* built-in 'true' handler */
+static int builtin_true(char **argv ATTRIBUTE_UNUSED)
+{
+        return 0;
+}
+
 /* built-in 'test' handler */
 static int builtin_test(char **argv)
 {
@@ -1005,7 +1011,7 @@ static int builtin_help(char **argv ATTRIBUTE_UNUSED)
 
         printf("\nBuilt-in commands:\n");
         printf("-------------------\n");
-        for (x = bltins; x->cmd; x++) {
+        for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
                 printf("%s\t%s\n", x->cmd, x->descr);
         }
         printf("\n\n");
@@ -1583,7 +1589,7 @@ static void pseudo_exec_argv(char **ptrs2free, char **argv)
          * easier to waste a few CPU cycles than it is to figure out
          * if this is one of those cases.
          */
-        for (x = bltins; x->cmd; x++) {
+        for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
                 if (strcmp(argv[0], x->cmd) == 0) {
                         debug_printf_exec("running builtin '%s'\n", argv[0]);
                         rcode = x->function(argv);
@@ -1965,7 +1971,7 @@ static int run_pipe(struct pipe *pi)
                         p = expand_string_to_string(argv[i]);
                         putenv(p);
                 }
-                for (x = bltins; x->cmd; x++) {
+                for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
                         if (strcmp(argv[i], x->cmd) == 0) {
                                 if (x->function == builtin_exec && argv[i+1] == NULL) {
                                         debug_printf("magic exec\n");
diff --git a/shell/hush_test/hush-bugs/glob_and_assign.right b/shell/hush_test/hush-bugs/glob_and_assign.right
new file mode 100644
index 000000000..dae832361
--- /dev/null
+++ b/shell/hush_test/hush-bugs/glob_and_assign.right
@@ -0,0 +1,2 @@
+ZVAR=z.map
+*.map
diff --git a/shell/hush_test/zbad2 b/shell/hush_test/hush-bugs/glob_and_assign.tests
index b6fffe59e..ea11e364b 100644..100755
--- a/shell/hush_test/zbad2
+++ b/shell/hush_test/hush-bugs/glob_and_assign.tests
@@ -1,5 +1,3 @@
-## TODO: fix and add to testsuite
-
 ## # bash zbad2
 ## ZVAR=z.map
 ## *.map
@@ -17,3 +15,4 @@
 ZVAR=*.map /bin/echo ZVAR=*.map
 ZVAR=*.map
 echo "$ZVAR"
+rm ZVAR=z.map
diff --git a/shell/hush_test/hush-bugs/glob_and_vars.right b/shell/hush_test/hush-bugs/glob_and_vars.right
new file mode 100644
index 000000000..3ac7ec5ff
--- /dev/null
+++ b/shell/hush_test/hush-bugs/glob_and_vars.right
@@ -0,0 +1 @@
+./glob_and_vars.right ./glob_and_vars.tests
diff --git a/shell/hush_test/hush-bugs/glob_and_vars.tests b/shell/hush_test/hush-bugs/glob_and_vars.tests
new file mode 100755
index 000000000..c8e0c067d
--- /dev/null
+++ b/shell/hush_test/hush-bugs/glob_and_vars.tests
@@ -0,0 +1,2 @@
+v=.
+echo $v/glob_and_vars.*
diff --git a/shell/hush_test/hush-bugs/while_in_subshell.right b/shell/hush_test/hush-bugs/while_in_subshell.right
new file mode 100644
index 000000000..290d39b7e
--- /dev/null
+++ b/shell/hush_test/hush-bugs/while_in_subshell.right
@@ -0,0 +1 @@
+OK: 0
diff --git a/shell/hush_test/hush-bugs/while_in_subshell.tests b/shell/hush_test/hush-bugs/while_in_subshell.tests
new file mode 100755
index 000000000..def8e092b
--- /dev/null
+++ b/shell/hush_test/hush-bugs/while_in_subshell.tests
@@ -0,0 +1,2 @@
+(while true; do exit; done)
+echo OK: $?
diff --git a/shell/hush_test/hush-misc/colon.right b/shell/hush_test/hush-misc/colon.right
new file mode 100644
index 000000000..2a87d0293
--- /dev/null
+++ b/shell/hush_test/hush-misc/colon.right
@@ -0,0 +1,2 @@
+0
+OK: 0
diff --git a/shell/hush_test/hush-misc/colon.tests b/shell/hush_test/hush-misc/colon.tests
new file mode 100755
index 000000000..ea3b4d5f3
--- /dev/null
+++ b/shell/hush_test/hush-misc/colon.tests
@@ -0,0 +1,6 @@
+false
+:
+echo $?
+# Extra ; after done is due to a bug
+(while :; do exit; done;)
+echo OK: $?
diff --git a/shell/hush_test/zbad b/shell/hush_test/zbad
deleted file mode 100644
index e4b5caa61..000000000
--- a/shell/hush_test/zbad
+++ /dev/null
@@ -1,3 +0,0 @@
-# TODO: hush doesn't know ':' null command
-
-while :; do exit; done