inet_pton.c

ソースコードを見る。

関数
static int	inet_pton4 (const char *src, unsigned char *dst)
static int	inet_pton6 (const char *src, unsigned char *dst)
int	inet_pton (int af, const char *src, void *dst)
static int	inet_pton4 (char *src, unsigned char *dst) const
static int	inet_pton6 (char *src, unsigned char *dst) const

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関数

static int inet_pton4	(	const char *	src,
		unsigned char *	dst
	)			[static]

参照元 inet_pton()・inet_pton6().

static int inet_pton6	(	const char *	src,
		unsigned char *	dst
	)			[static]

参照元 inet_pton().

int inet_pton	(	int	af,
		const char *	src,
		void *	dst
	)

inet_pton.c の 46 行で定義されています。

参照先 errno・inet_pton4()・inet_pton6().

参照元 getaddrinfo()・match_address().

{
        switch (af) {
        case AF_INET:
                return (inet_pton4(src, dst));
#ifdef INET6
        case AF_INET6:
                return (inet_pton6(src, dst));
#endif
        default:
                errno = EAFNOSUPPORT;
                return (-1);
        }
        /* NOTREACHED */
}

static int inet_pton4	(	char *	src,
		unsigned char *	dst
	)			const [static]

inet_pton.c の 75 行で定義されています。

{
        static const char digits[] = "0123456789";
        int saw_digit, octets, ch;
        unsigned char tmp[NS_INADDRSZ], *tp;

        saw_digit = 0;
        octets = 0;
        *(tp = tmp) = 0;
        while ((ch = *src++) != '\0') {
                const char *pch;

                if ((pch = strchr(digits, ch)) != NULL) {
                        unsigned int new = *tp * 10 + (pch - digits);

                        if (new > 255)
                                return (0);
                        *tp = new;
                        if (! saw_digit) {
                                if (++octets > 4)
                                        return (0);
                                saw_digit = 1;
                        }
                } else if (ch == '.' && saw_digit) {
                        if (octets == 4)
                                return (0);
                        *++tp = 0;
                        saw_digit = 0;
                } else
                        return (0);
        }
        if (octets < 4)
                return (0);
        memcpy(dst, tmp, NS_INADDRSZ);
        return (1);
}

static int inet_pton6	(	char *	src,
		unsigned char *	dst
	)			const [static]

inet_pton.c の 129 行で定義されています。

参照先 inet_pton4().

{
        static const char xdigits_l[] = "0123456789abcdef",
                          xdigits_u[] = "0123456789ABCDEF";
        unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
        const char *xdigits, *curtok;
        int ch, saw_xdigit;
        unsigned int val;

        memset((tp = tmp), '\0', NS_IN6ADDRSZ);
        endp = tp + NS_IN6ADDRSZ;
        colonp = NULL;
        /* Leading :: requires some special handling. */
        if (*src == ':')
                if (*++src != ':')
                        return (0);
        curtok = src;
        saw_xdigit = 0;
        val = 0;
        while ((ch = *src++) != '\0') {
                const char *pch;

                if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
                        pch = strchr((xdigits = xdigits_u), ch);
                if (pch != NULL) {
                        val <<= 4;
                        val |= (pch - xdigits);
                        if (val > 0xffff)
                                return (0);
                        saw_xdigit = 1;
                        continue;
                }
                if (ch == ':') {
                        curtok = src;
                        if (!saw_xdigit) {
                                if (colonp)
                                        return (0);
                                colonp = tp;
                                continue;
                        }
                        if (tp + NS_INT16SZ > endp)
                                return (0);
                        *tp++ = (unsigned char) (val >> 8) & 0xff;
                        *tp++ = (unsigned char) val & 0xff;
                        saw_xdigit = 0;
                        val = 0;
                        continue;
                }
                if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
                    inet_pton4(curtok, tp) > 0) {
                        tp += NS_INADDRSZ;
                        saw_xdigit = 0;
                        break;  /* '\0' was seen by inet_pton4(). */
                }
                return (0);
        }
        if (saw_xdigit) {
                if (tp + NS_INT16SZ > endp)
                        return (0);
                *tp++ = (unsigned char) (val >> 8) & 0xff;
                *tp++ = (unsigned char) val & 0xff;
        }
        if (colonp != NULL) {
                /*
                 * Since some memmove()'s erroneously fail to handle
                 * overlapping regions, we'll do the shift by hand.
                 */
                const int n = tp - colonp;
                int i;

                for (i = 1; i <= n; i++) {
                        endp[- i] = colonp[n - i];
                        colonp[n - i] = 0;
                }
                tp = endp;
        }
        if (tp != endp)
                return (0);
        memcpy(dst, tmp, NS_IN6ADDRSZ);
        return (1);
}

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