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Improve x509_inet_pton_ipv4 readability

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Introduce descriptive variable names.
Drop the table of tens.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2023-04-12 09:43:47 -04:00
parent b255e21e48
commit 13b8b780fe
1 changed files with 13 additions and 14 deletions
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27
library/x509_crt.c
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@ -2623,24 +2623,23 @@ static int x509_inet_pton_ipv6(const char *src, void *dst)
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 *v = (const unsigned char *) src;
const unsigned char *character = (const unsigned char *) src;
uint8_t *res = (uint8_t *) dst;
uint8_t d1, d2, d3, i = 0;
int ii;
const uint8_t tens[] = { 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 };
uint8_t digit1, digit2, digit3, num_octets = 0;
uint16_t octet;
do {
if ((d1 = *(uint8_t *) v - '0') > 9) {
if ((digit1 = *(uint8_t *) character - '0') > 9) {
break;
} else if ((d2 = *(uint8_t *) ++v - '0') > 9) {
*res++ = d1;
} else if ((d3 = *(uint8_t *) ++v - '0') > 9) {
*res++ = tens[d1] + d2;
} else if ((ii = (d1 < 2 ? d1 == 1 ? 100 : 0 : d1 == 2 ? 200 : 999)
+ tens[d2] + d3) < 256) {
*res++ = (uint8_t) ii, ++v;
} else if ((digit2 = *(uint8_t *) ++character - '0') > 9) {
*res++ = digit1;
} else if ((digit3 = *(uint8_t *) ++character - '0') > 9) {
*res++ = digit1 * 10 + digit2;
} else if ((octet = digit1 * 100 + digit2 * 10 + digit3) < 256) {
*res++ = (uint8_t) octet, ++character;
}
} while (++i < 4 && *v++ == '.');
return i == 4 && *v == '\0' ? 0 : -1;
} while (++num_octets < 4 && *character++ == '.');
return num_octets == 4 && *character == '\0' ? 0 : -1;
}
#else