string.c

bind-3.2.

/*
 * Copyright (C) 1999-2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: string.c,v 1.6 2001/01/09 21:56:30 bwelling Exp $ */

#include <config.h>

#include <ctype.h>

#include <isc/string.h>

static char digits[] = "0123456789abcdefghijklmnoprstuvwxyz";

isc_uint64_t
isc_string_touint64(char *source, char **end, int base) {
	isc_uint64_t tmp;
	isc_uint64_t overflow;
	char *s = source;
	char *o;
	char c;

	if ((base < 0) || (base == 1) || (base > 36)) {
		*end = source;
		return (0);
	}

	while (*s != 0 && isascii(*s&0xff) && isspace(*s&0xff))
		s++;
	if (*s == '+' /* || *s == '-' */)
		s++;
	if (base == 0) {
		if (*s == '0' && (*(s+1) == 'X' || *(s+1) == 'x')) {
			s += 2;
			base = 16;
		} else if (*s == '0')
			base = 8;
		else
			base = 10;
	}
	if (*s == 0) {
		*end = source;
		return (0);
	}
	overflow = ~0;
	overflow /= base;
	tmp = 0;

	while ((c = *s) != 0) {
		c = tolower(c);
		/* end ? */
		if ((o = strchr(digits, c)) == NULL) {
			*end = s;
			return (tmp);
		}
		/* end ? */
		if ((o - digits) >= base) {
			*end = s;
			return (tmp);
		}
		/* overflow ? */
		if (tmp > overflow) {
			*end = source;
			return (0);
		}
		tmp *= base;
		/* overflow ? */
		if ((tmp + (o - digits)) < tmp) {
			*end = source;
			return (0);
		}
		tmp += o - digits;
		s++;
	}
	*end = s;
	return (tmp);
}

char *
isc_string_separate(char **stringp, const char *delim) {
	char *string = *stringp;
	char *s;
	const char *d;
	char sc, dc;

	if (string == NULL)
		return (NULL);

	for (s = string; (sc = *s) != '\0'; s++)
		for (d = delim; (dc = *d) != '\0'; d++)
			if (sc == dc) {
				*s++ = '\0';
				*stringp = s;
				return (string);
			}
	*stringp = NULL;
	return (string);
}