ash: fix dequoting error detected by var_bash4 test

But the test still fails (one more bug to fix)

function                                             old     new   delta
changepath                                           195     192      -3
readtoken1                                          3247    3240      -7
subevalvar                                          1204    1184     -20
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-30)             Total: -30 bytes

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

diff --git a/shell/ash.c b/shell/ash.c
index 16783f2..74b1c3a 100644 (file)
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -6267,7 +6267,7 @@ varunset(const char *end, const char *var, const char *umsg, int varflags)
 
 #if ENABLE_ASH_BASH_COMPAT
 static char *
-parse_sub_pattern(char *arg, int inquotes)
+parse_sub_pattern(char *arg, int varflags)
 {
        char *idx, *repl = NULL;
        unsigned char c;
@@ -6285,7 +6285,7 @@ parse_sub_pattern(char *arg, int inquotes)
                        }
                }
                *idx++ = c;
-               if (!inquotes && c == '\\' && arg[1] == '\\')
+               if (!(varflags & VSQUOTE) && c == '\\' && arg[1] == '\\')
                        arg++; /* skip both \\, not just first one */
                arg++;
        }
@@ -6427,7 +6427,7 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
                char *idx, *end;
 
                if (!repl) {
-                       repl = parse_sub_pattern(str, varflags & VSQUOTE);
+                       repl = parse_sub_pattern(str, varflags);
                        //bb_error_msg("repl:'%s'", repl);
                        if (!repl)
                                repl = nullstr;
@@ -6496,12 +6496,11 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
                        }
 
                        if (subtype == VSREPLACE) {
+                               //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
                                while (*idx) {
                                        char *restart_detect = stackblock();
-                                       if (quotes && *idx == '\\') {
-                                               STPUTC(CTLESC, expdest);
-                                               len++;
-                                       }
+                                       if (quotes && (unsigned char)*idx == CTLESC)
+                                               idx++;
                                        STPUTC(*idx, expdest);
                                        if (stackblock() != restart_detect)
                                                goto restart;