dc: without -x, do not parse extended regs: 's p' means: store to ' ' reg, print

function                                             old     new   delta
zbc_lex_next                                        2240    2233      -7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-7)               Total: -7 bytes
   text	   data	    bss	    dec	    hex	filename
 981437	    485	   7296	 989218	  f1822	busybox_old
 981412	    485	   7296	 989193	  f1809	busybox_unstripped

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

1 files changed, 10 insertions, 11 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index d2583313c..ac3eaff96 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -3352,16 +3352,13 @@ static BC_STATUS zbc_lex_token(BcLex *l)
 #if ENABLE_DC
 static BC_STATUS zdc_lex_register(BcLex *l)
 {
-        if (isspace(l->buf[l->i - 1])) {
-                bc_lex_whitespace(l);
-                ++l->i;
-                if (!G_exreg)
-                        RETURN_STATUS(bc_error("extended register"));
+        if (G_exreg && isspace(l->buf[l->i])) {
+                bc_lex_whitespace(l); // eats whitespace (but not newline)
+                l->i++; // bc_lex_name() expects this
                 bc_lex_name(l);
-        }
-        else {
+        } else {
                 bc_vec_pop_all(&l->t.v);
-                bc_vec_push(&l->t.v, &l->buf[l->i - 1]);
+                bc_vec_push(&l->t.v, &l->buf[l->i++]);
                 bc_vec_pushZeroByte(&l->t.v);
                 l->t.t = BC_LEX_NAME;
         }
@@ -3425,8 +3422,8 @@ static BC_STATUS zdc_lex_token(BcLex *l)
                 BC_LEX_STORE_PUSH,
         };
 
-        BcStatus s = BC_STATUS_SUCCESS;
-        char c = l->buf[l->i++], c2;
+        BcStatus s;
+        char c, c2;
         size_t i;
 
         for (i = 0; i < ARRAY_SIZE(dc_lex_regs); ++i) {
@@ -3434,6 +3431,8 @@ static BC_STATUS zdc_lex_token(BcLex *l)
                         RETURN_STATUS(zdc_lex_register(l));
         }
 
+        s = BC_STATUS_SUCCESS;
+        c = l->buf[l->i++];
         if (c >= '%' && c <= '~'
          && (l->t.t = dc_char_to_LEX[c - '%']) != BC_LEX_INVALID
         ) {
@@ -3462,7 +3461,7 @@ static BC_STATUS zdc_lex_token(BcLex *l)
                 case '\f':
                 case '\r':
                 case ' ':
-                        l->newline = (c == '\n');
+                        l->newline = 0; // was (c == '\n')
                         bc_lex_whitespace(l);
                         break;
                 case '!':