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authorDenis Vlasenko <vda.linux@googlemail.com>2008-06-17 12:09:21 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-06-17 12:09:21 +0000
commit6eaf8deddd3c2cd747b09fb038f9e56f18250714 (patch)
tree44cd58a2415de3951bd5d694a78139633f605fcf /shell
parentb6926109b70cd6989384ea6ac1dc9dd9f842efc4 (diff)
downloadbusybox-6eaf8deddd3c2cd747b09fb038f9e56f18250714.tar.gz
hush: fix "for a in; do echo 'I should never run'; done" bug
Diffstat (limited to 'shell')
-rw-r--r--shell/hush.c18
-rw-r--r--shell/hush_test/hush-misc/empty_for.right (renamed from shell/hush_test/hush-bugs/empty_for.right)0
-rwxr-xr-xshell/hush_test/hush-misc/empty_for.tests (renamed from shell/hush_test/hush-bugs/empty_for.tests)0
3 files changed, 10 insertions, 8 deletions
diff --git a/shell/hush.c b/shell/hush.c
index ae12ebec4..45448c5f3 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -2004,7 +2004,7 @@ static int run_list(struct pipe *pi)
|| (rpipe->res_word == RES_FOR && rpipe->next->res_word != RES_IN)
) {
/* TODO: what is tested in the first condition? */
- syntax("malformed for"); /* 2nd condition: not followed by IN */
+ syntax("malformed for"); /* 2nd condition: FOR not followed by IN */
debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
return 1;
}
@@ -2898,7 +2898,8 @@ static int done_word(o_string *word, struct p_context *ctx)
ctx->pending_redirect = NULL;
}
#if ENABLE_HUSH_LOOPS
- if (ctx->res_w == RES_FOR) { /* comment? */
+ /* comment? is it forcing "for" to have just one word (variable name)? */
+ if (ctx->res_w == RES_FOR) {
//TESTING
//looks like (word->length == 0 && !word->nonnull) is true here, always
//(due to o_reset). done_word would return at once. Why then?
@@ -2910,8 +2911,8 @@ static int done_word(o_string *word, struct p_context *ctx)
return 0;
}
-/* The only possible error here is out of memory, in which case
- * xmalloc exits. */
+/* Command (member of a pipe) is complete. The only possible error here
+ * is out of memory, in which case xmalloc exits. */
static int done_command(struct p_context *ctx)
{
/* The child is really already in the pipe structure, so
@@ -2949,7 +2950,6 @@ static int done_command(struct p_context *ctx)
static void done_pipe(struct p_context *ctx, pipe_style type)
{
- struct pipe *new_p;
int not_null;
debug_printf_parse("done_pipe entered, followup %d\n", type);
@@ -2960,9 +2960,11 @@ static void done_pipe(struct p_context *ctx, pipe_style type)
ctx->ctx_inverted = 0;
/* Without this check, even just <enter> on command line generates
* tree of three NOPs (!). Which is harmless but annoying.
- * IOW: it is safe to do it unconditionally. */
- if (not_null) {
- new_p = new_pipe();
+ * IOW: it is safe to do it unconditionally.
+ * RES_IN case is for "for a in; do ..." (empty IN set)
+ * to work. */
+ if (not_null || ctx->pipe->res_word == RES_IN) {
+ struct pipe *new_p = new_pipe();
ctx->pipe->next = new_p;
ctx->pipe = new_p;
ctx->child = NULL; /* needed! */
diff --git a/shell/hush_test/hush-bugs/empty_for.right b/shell/hush_test/hush-misc/empty_for.right
index 290d39b7e..290d39b7e 100644
--- a/shell/hush_test/hush-bugs/empty_for.right
+++ b/shell/hush_test/hush-misc/empty_for.right
diff --git a/shell/hush_test/hush-bugs/empty_for.tests b/shell/hush_test/hush-misc/empty_for.tests
index 0cb52e849..0cb52e849 100755
--- a/shell/hush_test/hush-bugs/empty_for.tests
+++ b/shell/hush_test/hush-misc/empty_for.tests