static const char *
lex_parse_integer__(const char *p, struct lex_token *token)
{
lex_token_init(token);
token->type = LEX_T_INTEGER;
memset(&token->value, 0, sizeof token->value);
const char *start = p;
const char *end = start;
while (isalnum((unsigned char) *end) || *end == ':'
|| (*end == '.' && end[1] != '.')) {
end++;
}
size_t len = end - start;
int n;
struct eth_addr mac;
if (!len) {
lex_error(token, "Integer constant expected.");
} else if (len == 17
&& ovs_scan(start, ETH_ADDR_SCAN_FMT"%n",
ETH_ADDR_SCAN_ARGS(mac), &n)
&& n == len) {
token->value.mac = mac;
token->format = LEX_F_ETHERNET;
} else if (start + strspn(start, "0123456789") == end) {
if (p[0] == '0' && len > 1) {
lex_error(token, "Decimal constants must not have leading zeros.");
} else {
unsigned long long int integer;
char *tail;
errno = 0;
integer = strtoull(p, &tail, 10);
if (tail != end || errno == ERANGE) {
lex_error(token, "Decimal constants must be less than 2**64.");
} else {
token->value.integer = htonll(integer);
token->format = LEX_F_DECIMAL;
}
}
} else if (p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
if (len > 2) {
lex_parse_hex_integer(start + 2, len - 2, token);
} else {
lex_error(token, "Hex digits expected following 0%c.", p[1]);
}
} else if (len < INET6_ADDRSTRLEN) {
char copy[INET6_ADDRSTRLEN];
memcpy(copy, p, len);
copy[len] = '\0';
if (ip_parse(copy, &token->value.ipv4)) {
token->format = LEX_F_IPV4;
} else if (ipv6_parse(copy, &token->value.ipv6)) {
token->format = LEX_F_IPV6;
} else {
lex_error(token, "Invalid numeric constant.");
}
} else {
lex_error(token, "Invalid numeric constant.");
}
ovs_assert(token->type == LEX_T_INTEGER || token->type == LEX_T_ERROR);
return end;
}
static const char *
lex_parse_integer__(const char *p, struct lex_token *token)
{
lex_token_init(token);
token->type = LEX_T_INTEGER;
memset(&token->value, 0, sizeof token->value);
/* Find the extent of an "integer" token, which can be in decimal or
* hexadecimal, or an Ethernet address or IPv4 or IPv6 address, as 'start'
* through 'end'.
*
* Special cases we handle here are:
*
* - The ellipsis token "..", used as e.g. 123..456. A doubled dot
* is never valid syntax as part of an "integer", so we stop if
* we encounter two dots in a row.
*
* - Syntax like 1.2.3.4:1234 to indicate an IPv4 address followed by a
* port number should be considered three tokens: 1.2.3.4 : 1234.
* The obvious approach is to allow just dots or just colons within a
* given integer, but that would disallow IPv4-mapped IPv6 addresses,
* e.g. ::ffff:192.0.2.128. However, even in those addresses, a
* colon never follows a dot, so we stop if we encounter a colon
* after a dot.
*
* (There is no corresponding way to parse an IPv6 address followed
* by a port number: ::1:2:3:4:1234 is unavoidably ambiguous.)
*/
const char *start = p;
const char *end = start;
bool saw_dot = false;
while (isalnum((unsigned char) *end)
|| (*end == ':' && !saw_dot)
|| (*end == '.' && end[1] != '.')) {
if (*end == '.') {
saw_dot = true;
}
end++;
}
size_t len = end - start;
int n;
struct eth_addr mac;
if (!len) {
lex_error(token, "Integer constant expected.");
} else if (len == 17
&& ovs_scan(start, ETH_ADDR_SCAN_FMT"%n",
ETH_ADDR_SCAN_ARGS(mac), &n)
&& n == len) {
token->value.mac = mac;
token->format = LEX_F_ETHERNET;
} else if (start + strspn(start, "0123456789") == end) {
if (p[0] == '0' && len > 1) {
lex_error(token, "Decimal constants must not have leading zeros.");
} else {
unsigned long long int integer;
char *tail;
errno = 0;
integer = strtoull(p, &tail, 10);
if (tail != end || errno == ERANGE) {
lex_error(token, "Decimal constants must be less than 2**64.");
} else {
token->value.integer = htonll(integer);
token->format = LEX_F_DECIMAL;
}
}
} else if (p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
if (len > 2) {
lex_parse_hex_integer(start + 2, len - 2, token);
} else {
lex_error(token, "Hex digits expected following 0%c.", p[1]);
}
} else if (len < INET6_ADDRSTRLEN) {
char copy[INET6_ADDRSTRLEN];
memcpy(copy, p, len);
copy[len] = '\0';
if (ip_parse(copy, &token->value.ipv4)) {
token->format = LEX_F_IPV4;
} else if (ipv6_parse(copy, &token->value.ipv6)) {
token->format = LEX_F_IPV6;
} else {
lex_error(token, "Invalid numeric constant.");
}
} else {
lex_error(token, "Invalid numeric constant.");
}
ovs_assert(token->type == LEX_T_INTEGER || token->type == LEX_T_ERROR);
return end;
}