hush: fix handling of $_ (so far it's an ordinary variable, no special meaning)

function                                             old     new   delta
parse_dollar                                         820     779     -41

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 17 insertions, 10 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 7b83c736c..a9183c82f 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -4520,9 +4520,10 @@ static int parse_dollar(o_string *as_string,
 
         debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
         if (isalpha(ch)) {
+ make_var:
                 ch = i_getch(input);
                 nommu_addchr(as_string, ch);
- make_var:
+ /*make_var1:*/
                 o_addchr(dest, SPECIAL_VAR_SYMBOL);
                 while (1) {
                         debug_printf_parse(": '%c'\n", ch);
@@ -4715,19 +4716,22 @@ static int parse_dollar(o_string *as_string,
         }
 #endif
         case '_':
+                goto make_var;
+#if 0
+        /* TODO: $_ and $-: */
+        /* $_ Shell or shell script name; or last argument of last command
+         * (if last command wasn't a pipe; if it was, bash sets $_ to "");
+         * but in command's env, set to full pathname used to invoke it */
+        /* $- Option flags set by set builtin or shell options (-i etc) */
                 ch = i_getch(input);
                 nommu_addchr(as_string, ch);
                 ch = i_peek_and_eat_bkslash_nl(input);
                 if (isalnum(ch)) { /* it's $_name or $_123 */
                         ch = '_';
-                        goto make_var;
+                        goto make_var1;
                 }
                 /* else: it's $_ */
-        /* TODO: $_ and $-: */
-        /* $_ Shell or shell script name; or last argument of last command
-         * (if last command wasn't a pipe; if it was, bash sets $_ to "");
-         * but in command's env, set to full pathname used to invoke it */
-        /* $- Option flags set by set builtin or shell options (-i etc) */
+#endif
         default:
                 o_addQchr(dest, '$');
         }
@@ -5669,9 +5673,9 @@ static char *replace_pattern(char *val, const char *pattern, const char *repl, c
  */
 static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
 {
-        const char *val = NULL;
-        char *to_be_freed = NULL;
-        char *p = *pp;
+        const char *val;
+        char *to_be_freed;
+        char *p;
         char *var;
         char first_char;
         char exp_op;
@@ -5680,6 +5684,9 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
         char *exp_word = exp_word; /* for compiler */
         char arg0;
 
+        val = NULL;
+        to_be_freed = NULL;
+        p = *pp;
         *p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
         var = arg;
         exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;