bool str_to_bool(StringPiece* src) {
auto b = src->begin(), e = src->end();
for (;; ++b) {
FOLLY_RANGE_CHECK_STRINGPIECE(
b < e, "No non-whitespace characters found in input string", *src);
if (!isspace(*b)) break;
}
bool result;
size_t len = e - b;
switch (*b) {
case '0':
case '1': {
result = false;
for (; b < e && isdigit(*b); ++b) {
FOLLY_RANGE_CHECK_STRINGPIECE(
!result && (*b == '0' || *b == '1'),
"Integer overflow when parsing bool: must be 0 or 1", *src);
result = (*b == '1');
}
break;
}
case 'y':
case 'Y':
result = true;
if (!bool_str_cmp(&b, len, "yes")) {
++b; // accept the single 'y' character
}
break;
case 'n':
case 'N':
result = false;
if (!bool_str_cmp(&b, len, "no")) {
++b;
}
break;
case 't':
case 'T':
result = true;
if (!bool_str_cmp(&b, len, "true")) {
++b;
}
break;
case 'f':
case 'F':
result = false;
if (!bool_str_cmp(&b, len, "false")) {
++b;
}
break;
case 'o':
case 'O':
if (bool_str_cmp(&b, len, "on")) {
result = true;
} else if (bool_str_cmp(&b, len, "off")) {
result = false;
} else {
FOLLY_RANGE_CHECK_STRINGPIECE(false, "Invalid value for bool", *src);
}
break;
default:
FOLLY_RANGE_CHECK_STRINGPIECE(false, "Invalid value for bool", *src);
}
src->assign(b, e);
return result;
}
bool str_to_bool(StringPiece* src) {
auto b = src->begin(), e = src->end();
for (;; ++b) {
FOLLY_RANGE_CHECK(b < e,
"No non-whitespace characters found in input string");
if (!isspace(*b)) break;
}
bool result;
size_t len = e - b;
switch (*b) {
case '0':
case '1': {
// Attempt to parse the value as an integer
StringPiece tmp(*src);
uint8_t value = to<uint8_t>(&tmp);
// Only accept 0 or 1
FOLLY_RANGE_CHECK(value <= 1,
"Integer overflow when parsing bool: must be 0 or 1");
b = tmp.begin();
result = (value == 1);
break;
}
case 'y':
case 'Y':
result = true;
if (!bool_str_cmp(&b, len, "yes")) {
++b; // accept the single 'y' character
}
break;
case 'n':
case 'N':
result = false;
if (!bool_str_cmp(&b, len, "no")) {
++b;
}
break;
case 't':
case 'T':
result = true;
if (!bool_str_cmp(&b, len, "true")) {
++b;
}
break;
case 'f':
case 'F':
result = false;
if (!bool_str_cmp(&b, len, "false")) {
++b;
}
break;
case 'o':
case 'O':
if (bool_str_cmp(&b, len, "on")) {
result = true;
} else if (bool_str_cmp(&b, len, "off")) {
result = false;
} else {
FOLLY_RANGE_CHECK(false, "Invalid value for bool");
}
break;
default:
FOLLY_RANGE_CHECK(false, "Invalid value for bool");
}
src->assign(b, e);
return result;
}