diff options
Diffstat (limited to 'bin/sh/redir.c')
-rw-r--r-- | bin/sh/redir.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/bin/sh/redir.c b/bin/sh/redir.c index 95d3238..0a7aa96 100644 --- a/bin/sh/redir.c +++ b/bin/sh/redir.c @@ -70,6 +70,7 @@ struct redirtab { struct redirtab *next; int renamed[10]; int fd0_redirected; + unsigned int empty_redirs; }; @@ -82,6 +83,9 @@ static struct redirtab *redirlist; */ static int fd0_redirected = 0; +/* Number of redirtabs that have not been allocated. */ +static unsigned int empty_redirs = 0; + static void openredirect(union node *, char[10 ]); static int openhere(union node *); @@ -115,12 +119,17 @@ redirect(union node *redir, int flags) memory[i] = 0; memory[1] = flags & REDIR_BACKQ; if (flags & REDIR_PUSH) { - sv = ckmalloc(sizeof (struct redirtab)); - for (i = 0 ; i < 10 ; i++) - sv->renamed[i] = EMPTY; - sv->fd0_redirected = fd0_redirected; - sv->next = redirlist; - redirlist = sv; + empty_redirs++; + if (redir != NULL) { + sv = ckmalloc(sizeof (struct redirtab)); + for (i = 0 ; i < 10 ; i++) + sv->renamed[i] = EMPTY; + sv->fd0_redirected = fd0_redirected; + sv->empty_redirs = empty_redirs - 1; + sv->next = redirlist; + redirlist = sv; + empty_redirs = 0; + } } for (n = redir ; n ; n = n->nfile.next) { fd = n->nfile.fd; @@ -303,6 +312,12 @@ popredir(void) struct redirtab *rp = redirlist; int i; + INTOFF; + if (empty_redirs > 0) { + empty_redirs--; + INTON; + return; + } for (i = 0 ; i < 10 ; i++) { if (rp->renamed[i] != EMPTY) { if (rp->renamed[i] >= 0) { @@ -313,8 +328,8 @@ popredir(void) } } } - INTOFF; fd0_redirected = rp->fd0_redirected; + empty_redirs = rp->empty_redirs; redirlist = rp->next; ckfree(rp); INTON; |