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bc: further simplification in zbc_vm_stdin()

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function                                             old     new   delta
bc_vm_run                                            500     523     +23
bc_vec_concat                                         66       -     -66
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 23/-66)            Total: -43 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-13 18:16:39 +01:00
parent 818b602c88
commit b7e61e3e4a
1 changed files with 34 additions and 35 deletions
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69
miscutils/bc.c
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@ -7058,50 +7058,49 @@ static BC_STATUS zbc_vm_stdin(void)
comment = false;
str = 0;
for (;;) {
size_t len;
char *string;
bc_read_line(&buf);
len = buf.len - 1;
if (len == 0) // "" buf means EOF
if (buf.len <= 1) // "" buf means EOF
break;
if (len == 1) {
if (str && buf.v[0] == G.send)
str -= 1;
else if (buf.v[0] == G.sbgn)
str += 1;
} else {
char *string = buf.v;
while (*string) {
char c = *string;
if (string == buf.v || string[-1] != '\\') {
// checking applet type is cheaper than accessing sbgn/send
if (IS_BC) // bc: sbgn = send = '"'
str ^= (c == '"');
else { // dc: sbgn = '[', send = ']'
if (c == ']')
str -= 1;
else if (c == '[')
str += 1;
}
}
string++;
if (c == '/' && *string == '*') {
comment = true;
string++;
continue;
}
if (c == '*' && *string == '/') {
comment = false;
string++;
string = buf.v;
while (*string) {
char c = *string;
if (string == buf.v || string[-1] != '\\') {
// checking applet type is cheaper than accessing sbgn/send
if (IS_BC) // bc: sbgn = send = '"'
str ^= (c == '"');
else { // dc: sbgn = '[', send = ']'
if (c == ']')
str -= 1;
else if (c == '[')
str += 1;
}
}
if (str || comment || string[-2] == '\\') {
bc_vec_concat(&buffer, buf.v);
string++;
if (c == '/' && *string == '*') {
comment = true;
string++;
continue;
}
if (c == '*' && *string == '/') {
comment = false;
string++;
}
}
bc_vec_concat(&buffer, buf.v);
if (str || comment)
continue;
// Check for backslash+newline.
// we do not check that last char is '\n' -
// if it is not, then it's EOF, and looping back
// to bc_read_line() will detect it:
string -= 2;
if (string >= buf.v && *string == '\\')
continue;
s = zbc_vm_process(buffer.v);
if (s) {
if (ENABLE_FEATURE_CLEAN_UP && !G_ttyin) {