bc: delete unused (write-only) BcParse::nbraces member

function                                             old     new   delta
zbc_lex_next                                        2296    2309     +13
bc_parse_expr_empty_ok                              2021    2025      +4
bc_vm_init                                           760     757      -3
bc_num_printNewline                                   54      51      -3
zbc_num_divmod                                       156     150      -6
bc_parse_reset                                       113     106      -7
zbc_lex_number                                       200     192      -8
bc_parse_number                                       83      66     -17
zdc_parse_expr                                       707     671     -36
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/7 up/down: 17/-80)            Total: -63 bytes
   text	   data	    bss	    dec	    hex	filename
 982275	    485	   7296	 990056	  f1b68	busybox_old
 982212	    485	   7296	 989993	  f1b29	busybox_unstripped

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

1 files changed, 20 insertions, 21 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index a5d7a01c0..0e61642a7 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -435,9 +435,9 @@ typedef enum BcLexType {
         BC_LEX_COMMA,
         BC_LEX_RBRACKET,
 
-        BC_LEX_LBRACE,
+        BC_LEX_LBRACE, // '{' is 0x7B, '}' is 0x7D,
         BC_LEX_SCOLON,
-        BC_LEX_RBRACE,
+        BC_LEX_RBRACE, // should be LBRACE+2: code uses (c - '{' + BC_LEX_LBRACE)
 
         BC_LEX_STR,
         BC_LEX_NAME,
@@ -589,9 +589,6 @@ typedef struct BcParse {
         BcFunc *func;
         size_t fidx;
 
-//TODO: needed? Example?
-        size_t nbraces;
-
         size_t in_funcdef;
 } BcParse;
 
@@ -2777,7 +2774,9 @@ static void bc_lex_whitespace(BcLex *l)
         l->t.t = BC_LEX_WHITESPACE;
         for (;;) {
                 char c = l->buf[l->i];
-                if (c == '\n' || !isspace(c))
+                if (c == '\n') // this is BC_LEX_NLINE, not BC_LEX_WHITESPACE
+                        break;
+                if (!isspace(c))
                         break;
                 l->i++;
         }
@@ -3003,6 +3002,7 @@ static BC_STATUS zbc_lex_next(BcLex *l)
 
         // Loop until failure or we don't have whitespace. This
         // is so the parser doesn't get inundated with whitespace.
+        // Comments are also BC_LEX_WHITESPACE tokens and eaten here.
         s = BC_STATUS_SUCCESS;
         do {
                 dbg_lex("next string to parse:'%.*s'",
@@ -3149,9 +3149,9 @@ static BC_STATUS zbc_lex_comment(BcLex *l)
         const char *buf = l->buf;
 
         l->t.t = BC_LEX_WHITESPACE;
-        i = ++l->i;
+        i = l->i; /* here buf[l->i] is the '*' of opening comment delimiter */
         for (;;) {
-                char c = buf[i];
+                char c = buf[++i];
  check_star:
                 if (c == '*') {
                         c = buf[++i];
@@ -3164,7 +3164,6 @@ static BC_STATUS zbc_lex_comment(BcLex *l)
                         RETURN_STATUS(bc_error("comment end could not be found"));
                 }
                 nls += (c == '\n');
-                i++;
         }
 
         l->i = i + 1;
@@ -3184,10 +3183,14 @@ static BC_STATUS zbc_lex_token(BcLex *l)
 
         // This is the workhorse of the lexer.
         switch (c) {
-                case '\0':
+                case '\0': // probably never reached
+                        l->i--;
+                        l->t.t = BC_LEX_EOF;
+                        l->newline = true;
+                        break;
                 case '\n':
+                        l->t.t = BC_LEX_NLINE;
                         l->newline = true;
-                        l->t.t = !c ? BC_LEX_EOF : BC_LEX_NLINE;
                         break;
                 case '\t':
                 case '\v':
@@ -3556,7 +3559,7 @@ static void bc_parse_pushIndex(BcParse *p, size_t idx)
         }
 }
 
-static void bc_parse_number(BcParse *p, BcInst *prev, size_t *nexs)
+static void bc_parse_number(BcParse *p)
 {
         char *num = xstrdup(p->l.t.v.v);
         size_t idx = G.prog.consts.len;
@@ -3565,9 +3568,6 @@ static void bc_parse_number(BcParse *p, BcInst *prev, size_t *nexs)
 
         bc_parse_push(p, BC_INST_NUM);
         bc_parse_pushIndex(p, idx);
-
-        ++(*nexs);
-        (*prev) = BC_INST_NUM;
 }
 
 IF_BC(static BC_STATUS zbc_parse_stmt_or_funcdef(BcParse *p);)
@@ -3624,7 +3624,6 @@ static void bc_parse_reset(BcParse *p)
 
         p->l.i = p->l.len;
         p->l.t.t = BC_LEX_EOF;
-        p->nbraces = 0;
 
         bc_vec_pop_all(&p->exits);
         bc_vec_pop_all(&p->conds);
@@ -3650,7 +3649,6 @@ static void bc_parse_create(BcParse *p, size_t func)
         bc_vec_init(&p->conds, sizeof(size_t), NULL);
         bc_vec_init(&p->ops, sizeof(BcLexType), NULL);
 
-        // p->nbraces = 0; - already is
         bc_parse_updateFunc(p, func);
 }
 
@@ -4846,7 +4844,9 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags, BcParseNext ne
                         {
                                 if (BC_PARSE_LEAF(prev, rprn))
                                         return bc_error_bad_expression();
-                                bc_parse_number(p, &prev, &nexprs);
+                                bc_parse_number(p);
+                                nexprs++;
+                                prev = BC_INST_NUM;
                                 paren_expr = get_token = true;
                                 rprn = bin_last = false;
 
@@ -5111,7 +5111,8 @@ static BC_STATUS zdc_parse_token(BcParse *p, BcLexType t, uint8_t flags)
                                 if (p->l.t.t != BC_LEX_NUMBER)
                                         RETURN_STATUS(bc_error_bad_token());
                         }
-                        bc_parse_number(p, &prev, &p->nbraces);
+                        bc_parse_number(p);
+                        prev = BC_INST_NUM;
                         if (t == BC_LEX_NEG) bc_parse_push(p, BC_INST_NEG);
                         get_token = true;
                         break;
@@ -5159,8 +5160,6 @@ static BC_STATUS zdc_parse_expr(BcParse *p, uint8_t flags)
         BcInst inst;
         BcLexType t;
 
-        if (flags & BC_PARSE_NOCALL) p->nbraces = G.prog.results.len;
-
         for (t = p->l.t.t; !s && t != BC_LEX_EOF; t = p->l.t.t) {
                 inst = dc_parse_insts[t];