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authorDenys Vlasenko <vda.linux@googlemail.com>2018-12-25 01:16:37 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2018-12-25 01:16:37 +0100
commitbb116031a038237ecc82896fb6b12b89b72f8d91 (patch)
tree24bad0f039c3fd421d1935a084f2798430ab26e1 /miscutils
parentd897c9aca6424b9a143746f73df1c132292bb091 (diff)
downloadbusybox-bb116031a038237ecc82896fb6b12b89b72f8d91.tar.gz
bc: simplify bc_parse_expr_empty_ok()
function old new delta bc_parse_expr_empty_ok 1846 1819 -27 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils')
-rw-r--r--miscutils/bc.c36
1 files changed, 20 insertions, 16 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 62bdd9a44..5d9bae47e 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -4661,20 +4661,21 @@ static BC_STATUS zbc_parse_stmt_or_funcdef(BcParse *p)
// This is not a "z" function: can also return BC_STATUS_PARSE_EMPTY_EXP
static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
{
- BcStatus s = BC_STATUS_SUCCESS;
BcInst prev = XC_INST_PRINT;
BcLexType top, t = p->l.lex;
size_t nexprs = 0, ops_bgn = p->ops.len;
unsigned nparens, nrelops;
- bool paren_first, paren_expr, rprn, done, get_token, assign, bin_last;
+ bool paren_first, paren_expr, rprn, get_token, assign, bin_last;
dbg_lex_enter("%s:%d entered", __func__, __LINE__);
paren_first = (p->l.lex == BC_LEX_LPAREN);
nparens = nrelops = 0;
- paren_expr = rprn = done = get_token = assign = false;
+ paren_expr = rprn = get_token = assign = false;
bin_last = true;
- for (; !G_interrupt && !s && !done && bc_parse_exprs(t); t = p->l.lex) {
+ for (; bc_parse_exprs(t); t = p->l.lex) {
+ BcStatus s = BC_STATUS_SUCCESS;
+
dbg_lex("%s:%d t:%d", __func__, __LINE__, t);
switch (t) {
case BC_LEX_OP_INC:
@@ -4743,10 +4744,7 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
if (bin_last || prev == XC_INST_BOOL_NOT)
return bc_error_bad_expression();
if (nparens == 0) {
- s = BC_STATUS_SUCCESS;
- done = true;
- get_token = false;
- break;
+ goto exit_loop;
}
if (!paren_expr) {
dbg_lex_done("%s:%d done (returning EMPTY_EXP)", __func__, __LINE__);
@@ -4763,7 +4761,7 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
paren_expr = true;
rprn = get_token = bin_last = false;
s = zbc_parse_name(p, &prev, flags & ~BC_PARSE_NOCALL);
- ++nexprs;
+ nexprs++;
break;
case XC_LEX_NUMBER:
if (BC_PARSE_LEAF(prev, rprn))
@@ -4807,21 +4805,24 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
if (BC_PARSE_LEAF(prev, rprn))
return bc_error_bad_expression();
s = zbc_parse_scale(p, &prev, flags);
+ prev = XC_INST_SCALE;
paren_expr = true;
rprn = get_token = bin_last = false;
nexprs++;
- prev = XC_INST_SCALE;
break;
default:
s = bc_error_bad_token();
break;
}
- if (!s && get_token) s = zbc_lex_next(&p->l);
+ if (s || G_interrupt) // error, or ^C: stop parsing
+ return BC_STATUS_FAILURE;
+ if (get_token) {
+ s = zbc_lex_next(&p->l);
+ if (s) return s;
+ }
}
-
- if (s) return s;
- if (G_interrupt) return BC_STATUS_FAILURE; // ^C: stop parsing
+ exit_loop:
while (p->ops.len > ops_bgn) {
top = BC_PARSE_TOP_OP(p);
@@ -4840,20 +4841,23 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
return bc_error_bad_expression();
if (!(flags & BC_PARSE_REL) && nrelops) {
+ BcStatus s;
s = zbc_POSIX_does_not_allow("comparison operators outside if or loops");
if (s) return s;
} else if ((flags & BC_PARSE_REL) && nrelops > 1) {
+ BcStatus s;
s = zbc_POSIX_requires("exactly one comparison operator per condition");
if (s) return s;
}
if (flags & BC_PARSE_PRINT) {
- if (paren_first || !assign) bc_parse_push(p, XC_INST_PRINT);
+ if (paren_first || !assign)
+ bc_parse_push(p, XC_INST_PRINT);
bc_parse_push(p, XC_INST_POP);
}
dbg_lex_done("%s:%d done", __func__, __LINE__);
- return s;
+ return BC_STATUS_SUCCESS;
}
#endif // ENABLE_BC