#include "config.h"
#include "includes.h"

char *strchr_items(str, chr, open, close)
char *str;
char chr, open, close;
{
	while (str[0]) {
		if (str[0] == chr)
			return str;

		else if (str[0] == open) {
			str = strchr(str + 1, close);
			if (!str)
				return str;
		}
		str++;
	}
	if (!str[0])
		str = NULL;
	return str;
}

char *matching_items(str, open, close)
char *str;
char open;
char close;
{

	char *s = (char *) strchr(str, open);
	if (s) {
		char v;
		int level = 1;
		while (level) {
			s++;
			v = s[0];
			if (!v)
				break;
			if (v == open)
				level++;
			else if (v == close)
				level--;
		}
		if (!s[0])
			s = NULL;
	}
	return s;
}

#ifndef HAVE_INET_ATON
/*
 * Coming straight from Fyodor's Nmap
 */
int inet_aton(cp, addr)
register const char *cp;
struct in_addr *addr;
{
	register unsigned int val;	/* changed from u_long --david */
	register int base, n;
	register char c;
	u_int parts[4];
	register u_int *pp = parts;

	c = *cp;
	for (;;) {
		/*
		 * Collect number up to ``.''.
		 * Values are specified as for C:
		 * 0x=hex, 0=octal, isdigit=decimal.
		 */
		if (!isdigit((int) c))
			return (0);
		val = 0;
		base = 10;
		if (c == '0') {
			c = *++cp;
			if (c == 'x' || c == 'X')
				base = 16, c = *++cp;
			else
				base = 8;
		}
		for (;;) {
			if (isascii((int) c) && isdigit((int) c)) {
				val = (val * base) + (c - '0');
				c = *++cp;
			} else if (base == 16 && isascii((int) c)
				   && isxdigit((int) c)) {
				val =
				    (val << 4) | (c + 10 -
						  (islower((int) c) ? 'a' : 'A'));
				c = *++cp;
			} else
				break;
		}
		if (c == '.') {
			/*
			 * Internet format:
			 *      a.b.c.d
			 *      a.b.c   (with c treated as 16 bits)
			 *      a.b     (with b treated as 24 bits)
			 */
			if (pp >= parts + 3)
				return (0);
			*pp++ = val;
			c = *++cp;
		} else
			break;
	}
	/*
	 * Check for trailing characters.
	 */
	if (c != '\0' && (!isascii((int) c) || !isspace((int) c)))
		return (0);
	/*
	 * Concoct the address according to
	 * the number of parts specified.
	 */
	n = pp - parts + 1;
	switch (n) {

	case 0:
		return (0);	/* initial nondigit */

	case 1:		/* a -- 32 bits */
		break;

	case 2:		/* a.b -- 8.24 bits */
		if (val > 0xffffff)
			return (0);
		val |= parts[0] << 24;
		break;

	case 3:		/* a.b.c -- 8.8.16 bits */
		if (val > 0xffff)
			return (0);
		val |= (parts[0] << 24) | (parts[1] << 16);
		break;

	case 4:		/* a.b.c.d -- 8.8.8.8 bits */
		if (val > 0xff)
			return (0);
		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
		break;
	}
	if (addr)
		addr->s_addr = htonl(val);
	return (1);
}
#endif				/* ! HAVE_INET_ATON */