aboutsummaryrefslogtreecommitdiff
path: root/shell
diff options
context:
space:
mode:
authorDenys Vlasenko <vda.linux@googlemail.com>2017-07-26 19:22:34 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-07-26 20:33:51 +0200
commitb8ab27bf53797ec98c7c7d1c80a5a0a062f273a5 (patch)
tree14362945f3667333a676736f5d689c3330735050 /shell
parentcf3a796dd1dfe53f7d67507f7f4d5c05cc7ebc8d (diff)
downloadbusybox-b8ab27bf53797ec98c7c7d1c80a5a0a062f273a5.tar.gz
ash: [VAR] Add localvars nesting
Upstream commit: Date: Mon, 24 May 2010 15:31:27 +0800 [VAR] Add localvars nesting This patch adds localvars nesting infrastructure so we can reuse the localvars mechanism for command evaluation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
-rw-r--r--shell/ash.c57
1 files changed, 44 insertions, 13 deletions
diff --git a/shell/ash.c b/shell/ash.c
index 915e86167..8bef78546 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -9167,7 +9167,12 @@ optschanged(void)
#endif
}
-static struct localvar *localvars;
+struct localvar_list {
+ struct localvar_list *next;
+ struct localvar *lv;
+};
+
+static struct localvar_list *localvar_stack;
/*
* Called after a function returns.
@@ -9176,11 +9181,19 @@ static struct localvar *localvars;
static void
poplocalvars(void)
{
- struct localvar *lvp;
+ struct localvar_list *ll;
+ struct localvar *lvp, *next;
struct var *vp;
- while ((lvp = localvars) != NULL) {
- localvars = lvp->next;
+ INT_OFF;
+ ll = localvar_stack;
+ localvar_stack = ll->next;
+
+ next = ll->lv;
+ free(ll);
+
+ while ((lvp = next) != NULL) {
+ next = lvp->next;
vp = lvp->vp;
TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
if (vp == NULL) { /* $- saved */
@@ -9199,19 +9212,34 @@ poplocalvars(void)
}
free(lvp);
}
+ INT_ON;
+}
+
+/*
+ * Create a new localvar environment.
+ */
+static void
+pushlocalvars(void)
+{
+ struct localvar_list *ll;
+
+ INT_OFF;
+ ll = ckzalloc(sizeof(*ll));
+ /*ll->lv = NULL; - zalloc did it */
+ ll->next = localvar_stack;
+ localvar_stack = ll;
+ INT_ON;
}
static int
evalfun(struct funcnode *func, int argc, char **argv, int flags)
{
volatile struct shparam saveparam;
- struct localvar *volatile savelocalvars;
struct jmploc *volatile savehandler;
struct jmploc jmploc;
int e;
saveparam = shellparam;
- savelocalvars = localvars;
savehandler = exception_handler;
e = setjmp(jmploc.loc);
if (e) {
@@ -9219,7 +9247,6 @@ evalfun(struct funcnode *func, int argc, char **argv, int flags)
}
INT_OFF;
exception_handler = &jmploc;
- localvars = NULL;
shellparam.malloced = 0;
func->count++;
funcnest++;
@@ -9230,13 +9257,13 @@ evalfun(struct funcnode *func, int argc, char **argv, int flags)
shellparam.optind = 1;
shellparam.optoff = -1;
#endif
+ pushlocalvars();
evaltree(func->n.narg.next, flags & EV_TESTED);
+ poplocalvars();
funcdone:
INT_OFF;
funcnest--;
freefunc(func);
- poplocalvars();
- localvars = savelocalvars;
freeparam(&shellparam);
shellparam = saveparam;
exception_handler = savehandler;
@@ -9265,7 +9292,7 @@ mklocal(char *name)
* x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
* x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
*/
- lvp = localvars;
+ lvp = localvar_stack->lv;
while (lvp) {
if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
if (eq)
@@ -9310,8 +9337,8 @@ mklocal(char *name)
}
}
lvp->vp = vp;
- lvp->next = localvars;
- localvars = lvp;
+ lvp->next = localvar_stack->lv;
+ localvar_stack->lv = lvp;
ret:
INT_ON;
}
@@ -9324,7 +9351,7 @@ localcmd(int argc UNUSED_PARAM, char **argv)
{
char *name;
- if (!funcnest)
+ if (!localvar_stack)
ash_msg_and_raise_error("not in a function");
argv = argptr;
@@ -13570,6 +13597,10 @@ reset(void)
/* from redir.c: */
while (redirlist)
popredir(/*drop:*/ 0, /*restore:*/ 0);
+
+ /* from var.c: */
+ while (localvar_stack)
+ poplocalvars();
}
#if PROFILE