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Further refactor IPv4 parsing

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Make it more readable
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2023-04-18 04:39:12 -04:00
parent 6cbca6dd42
commit ea3e71fa37
1 changed files with 17 additions and 9 deletions
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26
library/x509_crt.c
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@ -2638,20 +2638,28 @@ static int x509_inet_pton_ipv4(const char *src, void *dst)
/* note: allows leading 0's, e.g. 000.000.000.000 */
const unsigned char *p = (const unsigned char *) src;
uint8_t *res = (uint8_t *) dst;
uint8_t digit1, digit2, digit3, num_octets = 0;
uint8_t digit, num_digits = 0;
uint8_t num_octets = 0;
uint16_t octet;
do {
if ((digit1 = *(uint8_t *) p - '0') > 9) {
octet = num_digits = 0;
do {
digit = *p - '0';
if (digit > 9) {
break;
}
octet = octet * 10 + digit;
num_digits++;
p++;
} while (num_digits < 3);
if (octet >= 256 || num_digits > 3 || num_digits == 0) {
break;
} else if ((digit2 = *(uint8_t *) ++p - '0') > 9) {
*res++ = digit1;
} else if ((digit3 = *(uint8_t *) ++p - '0') > 9) {
*res++ = digit1 * 10 + digit2;
} else if ((octet = digit1 * 100 + digit2 * 10 + digit3) < 256) {
*res++ = (uint8_t) octet, ++p;
}
} while (++num_octets < 4 && *p++ == '.');
*res++ = (uint8_t) octet;
num_octets++;
} while (num_octets < 4 && *p++ == '.');
return num_octets == 4 && *p == '\0' ? 0 : -1;
}