ash: fix bad interaction between ash -c '....&' and bash compat

diff --git a/shell/ash.c b/shell/ash.c
index d44de33..55a79a7 100644 (file)
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -9189,8 +9189,9 @@ preadbuffer(void)
 
        while (g_parsefile->strpush) {
 #if ENABLE_ASH_ALIAS
-               if (parsenleft == -1 && g_parsefile->strpush->ap &&
-                       parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
+               if (parsenleft == -1 && g_parsefile->strpush->ap
+                && parsenextc[-1] != ' ' && parsenextc[-1] != '\t'
+               ) {
                        return PEOA;
                }
 #endif
@@ -9314,6 +9315,9 @@ pfgets(char *line, int len)
 static void
 pungetc(void)
 {
+       /* check is needed for ash -c 'echo 5&' + BASH_COMPAT to work */
+       if (parsenleft < 0)
+               return;
        parsenleft++;
        parsenextc--;
 }